summaryrefslogtreecommitdiff
path: root/builtin/apply.c
diff options
context:
space:
mode:
Diffstat (limited to 'builtin/apply.c')
-rw-r--r--builtin/apply.c3670
1 files changed, 3670 insertions, 0 deletions
diff --git a/builtin/apply.c b/builtin/apply.c
new file mode 100644
index 0000000..3af4ae0
--- /dev/null
+++ b/builtin/apply.c
@@ -0,0 +1,3670 @@
+/*
+ * apply.c
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ *
+ * This applies patches on top of some (arbitrary) version of the SCM.
+ *
+ */
+#include "cache.h"
+#include "cache-tree.h"
+#include "quote.h"
+#include "blob.h"
+#include "delta.h"
+#include "builtin.h"
+#include "string-list.h"
+#include "dir.h"
+#include "parse-options.h"
+
+/*
+ * --check turns on checking that the working tree matches the
+ * files that are being modified, but doesn't apply the patch
+ * --stat does just a diffstat, and doesn't actually apply
+ * --numstat does numeric diffstat, and doesn't actually apply
+ * --index-info shows the old and new index info for paths if available.
+ * --index updates the cache as well.
+ * --cached updates only the cache without ever touching the working tree.
+ */
+static const char *prefix;
+static int prefix_length = -1;
+static int newfd = -1;
+
+static int unidiff_zero;
+static int p_value = 1;
+static int p_value_known;
+static int check_index;
+static int update_index;
+static int cached;
+static int diffstat;
+static int numstat;
+static int summary;
+static int check;
+static int apply = 1;
+static int apply_in_reverse;
+static int apply_with_reject;
+static int apply_verbosely;
+static int no_add;
+static const char *fake_ancestor;
+static int line_termination = '\n';
+static unsigned int p_context = UINT_MAX;
+static const char * const apply_usage[] = {
+ "git apply [options] [<patch>...]",
+ NULL
+};
+
+static enum ws_error_action {
+ nowarn_ws_error,
+ warn_on_ws_error,
+ die_on_ws_error,
+ correct_ws_error,
+} ws_error_action = warn_on_ws_error;
+static int whitespace_error;
+static int squelch_whitespace_errors = 5;
+static int applied_after_fixing_ws;
+
+static enum ws_ignore {
+ ignore_ws_none,
+ ignore_ws_change,
+} ws_ignore_action = ignore_ws_none;
+
+
+static const char *patch_input_file;
+static const char *root;
+static int root_len;
+static int read_stdin = 1;
+static int options;
+
+static void parse_whitespace_option(const char *option)
+{
+ if (!option) {
+ ws_error_action = warn_on_ws_error;
+ return;
+ }
+ if (!strcmp(option, "warn")) {
+ ws_error_action = warn_on_ws_error;
+ return;
+ }
+ if (!strcmp(option, "nowarn")) {
+ ws_error_action = nowarn_ws_error;
+ return;
+ }
+ if (!strcmp(option, "error")) {
+ ws_error_action = die_on_ws_error;
+ return;
+ }
+ if (!strcmp(option, "error-all")) {
+ ws_error_action = die_on_ws_error;
+ squelch_whitespace_errors = 0;
+ return;
+ }
+ if (!strcmp(option, "strip") || !strcmp(option, "fix")) {
+ ws_error_action = correct_ws_error;
+ return;
+ }
+ die("unrecognized whitespace option '%s'", option);
+}
+
+static void parse_ignorewhitespace_option(const char *option)
+{
+ if (!option || !strcmp(option, "no") ||
+ !strcmp(option, "false") || !strcmp(option, "never") ||
+ !strcmp(option, "none")) {
+ ws_ignore_action = ignore_ws_none;
+ return;
+ }
+ if (!strcmp(option, "change")) {
+ ws_ignore_action = ignore_ws_change;
+ return;
+ }
+ die("unrecognized whitespace ignore option '%s'", option);
+}
+
+static void set_default_whitespace_mode(const char *whitespace_option)
+{
+ if (!whitespace_option && !apply_default_whitespace)
+ ws_error_action = (apply ? warn_on_ws_error : nowarn_ws_error);
+}
+
+/*
+ * For "diff-stat" like behaviour, we keep track of the biggest change
+ * we've seen, and the longest filename. That allows us to do simple
+ * scaling.
+ */
+static int max_change, max_len;
+
+/*
+ * Various "current state", notably line numbers and what
+ * file (and how) we're patching right now.. The "is_xxxx"
+ * things are flags, where -1 means "don't know yet".
+ */
+static int linenr = 1;
+
+/*
+ * This represents one "hunk" from a patch, starting with
+ * "@@ -oldpos,oldlines +newpos,newlines @@" marker. The
+ * patch text is pointed at by patch, and its byte length
+ * is stored in size. leading and trailing are the number
+ * of context lines.
+ */
+struct fragment {
+ unsigned long leading, trailing;
+ unsigned long oldpos, oldlines;
+ unsigned long newpos, newlines;
+ const char *patch;
+ int size;
+ int rejected;
+ int linenr;
+ struct fragment *next;
+};
+
+/*
+ * When dealing with a binary patch, we reuse "leading" field
+ * to store the type of the binary hunk, either deflated "delta"
+ * or deflated "literal".
+ */
+#define binary_patch_method leading
+#define BINARY_DELTA_DEFLATED 1
+#define BINARY_LITERAL_DEFLATED 2
+
+/*
+ * This represents a "patch" to a file, both metainfo changes
+ * such as creation/deletion, filemode and content changes represented
+ * as a series of fragments.
+ */
+struct patch {
+ char *new_name, *old_name, *def_name;
+ unsigned int old_mode, new_mode;
+ int is_new, is_delete; /* -1 = unknown, 0 = false, 1 = true */
+ int rejected;
+ unsigned ws_rule;
+ unsigned long deflate_origlen;
+ int lines_added, lines_deleted;
+ int score;
+ unsigned int is_toplevel_relative:1;
+ unsigned int inaccurate_eof:1;
+ unsigned int is_binary:1;
+ unsigned int is_copy:1;
+ unsigned int is_rename:1;
+ unsigned int recount:1;
+ struct fragment *fragments;
+ char *result;
+ size_t resultsize;
+ char old_sha1_prefix[41];
+ char new_sha1_prefix[41];
+ struct patch *next;
+};
+
+/*
+ * A line in a file, len-bytes long (includes the terminating LF,
+ * except for an incomplete line at the end if the file ends with
+ * one), and its contents hashes to 'hash'.
+ */
+struct line {
+ size_t len;
+ unsigned hash : 24;
+ unsigned flag : 8;
+#define LINE_COMMON 1
+};
+
+/*
+ * This represents a "file", which is an array of "lines".
+ */
+struct image {
+ char *buf;
+ size_t len;
+ size_t nr;
+ size_t alloc;
+ struct line *line_allocated;
+ struct line *line;
+};
+
+/*
+ * Records filenames that have been touched, in order to handle
+ * the case where more than one patches touch the same file.
+ */
+
+static struct string_list fn_table;
+
+static uint32_t hash_line(const char *cp, size_t len)
+{
+ size_t i;
+ uint32_t h;
+ for (i = 0, h = 0; i < len; i++) {
+ if (!isspace(cp[i])) {
+ h = h * 3 + (cp[i] & 0xff);
+ }
+ }
+ return h;
+}
+
+/*
+ * Compare lines s1 of length n1 and s2 of length n2, ignoring
+ * whitespace difference. Returns 1 if they match, 0 otherwise
+ */
+static int fuzzy_matchlines(const char *s1, size_t n1,
+ const char *s2, size_t n2)
+{
+ const char *last1 = s1 + n1 - 1;
+ const char *last2 = s2 + n2 - 1;
+ int result = 0;
+
+ if (n1 < 0 || n2 < 0)
+ return 0;
+
+ /* ignore line endings */
+ while ((*last1 == '\r') || (*last1 == '\n'))
+ last1--;
+ while ((*last2 == '\r') || (*last2 == '\n'))
+ last2--;
+
+ /* skip leading whitespace */
+ while (isspace(*s1) && (s1 <= last1))
+ s1++;
+ while (isspace(*s2) && (s2 <= last2))
+ s2++;
+ /* early return if both lines are empty */
+ if ((s1 > last1) && (s2 > last2))
+ return 1;
+ while (!result) {
+ result = *s1++ - *s2++;
+ /*
+ * Skip whitespace inside. We check for whitespace on
+ * both buffers because we don't want "a b" to match
+ * "ab"
+ */
+ if (isspace(*s1) && isspace(*s2)) {
+ while (isspace(*s1) && s1 <= last1)
+ s1++;
+ while (isspace(*s2) && s2 <= last2)
+ s2++;
+ }
+ /*
+ * If we reached the end on one side only,
+ * lines don't match
+ */
+ if (
+ ((s2 > last2) && (s1 <= last1)) ||
+ ((s1 > last1) && (s2 <= last2)))
+ return 0;
+ if ((s1 > last1) && (s2 > last2))
+ break;
+ }
+
+ return !result;
+}
+
+static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag)
+{
+ ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc);
+ img->line_allocated[img->nr].len = len;
+ img->line_allocated[img->nr].hash = hash_line(bol, len);
+ img->line_allocated[img->nr].flag = flag;
+ img->nr++;
+}
+
+static void prepare_image(struct image *image, char *buf, size_t len,
+ int prepare_linetable)
+{
+ const char *cp, *ep;
+
+ memset(image, 0, sizeof(*image));
+ image->buf = buf;
+ image->len = len;
+
+ if (!prepare_linetable)
+ return;
+
+ ep = image->buf + image->len;
+ cp = image->buf;
+ while (cp < ep) {
+ const char *next;
+ for (next = cp; next < ep && *next != '\n'; next++)
+ ;
+ if (next < ep)
+ next++;
+ add_line_info(image, cp, next - cp, 0);
+ cp = next;
+ }
+ image->line = image->line_allocated;
+}
+
+static void clear_image(struct image *image)
+{
+ free(image->buf);
+ image->buf = NULL;
+ image->len = 0;
+}
+
+static void say_patch_name(FILE *output, const char *pre,
+ struct patch *patch, const char *post)
+{
+ fputs(pre, output);
+ if (patch->old_name && patch->new_name &&
+ strcmp(patch->old_name, patch->new_name)) {
+ quote_c_style(patch->old_name, NULL, output, 0);
+ fputs(" => ", output);
+ quote_c_style(patch->new_name, NULL, output, 0);
+ } else {
+ const char *n = patch->new_name;
+ if (!n)
+ n = patch->old_name;
+ quote_c_style(n, NULL, output, 0);
+ }
+ fputs(post, output);
+}
+
+#define CHUNKSIZE (8192)
+#define SLOP (16)
+
+static void read_patch_file(struct strbuf *sb, int fd)
+{
+ if (strbuf_read(sb, fd, 0) < 0)
+ die_errno("git apply: failed to read");
+
+ /*
+ * Make sure that we have some slop in the buffer
+ * so that we can do speculative "memcmp" etc, and
+ * see to it that it is NUL-filled.
+ */
+ strbuf_grow(sb, SLOP);
+ memset(sb->buf + sb->len, 0, SLOP);
+}
+
+static unsigned long linelen(const char *buffer, unsigned long size)
+{
+ unsigned long len = 0;
+ while (size--) {
+ len++;
+ if (*buffer++ == '\n')
+ break;
+ }
+ return len;
+}
+
+static int is_dev_null(const char *str)
+{
+ return !memcmp("/dev/null", str, 9) && isspace(str[9]);
+}
+
+#define TERM_SPACE 1
+#define TERM_TAB 2
+
+static int name_terminate(const char *name, int namelen, int c, int terminate)
+{
+ if (c == ' ' && !(terminate & TERM_SPACE))
+ return 0;
+ if (c == '\t' && !(terminate & TERM_TAB))
+ return 0;
+
+ return 1;
+}
+
+/* remove double slashes to make --index work with such filenames */
+static char *squash_slash(char *name)
+{
+ int i = 0, j = 0;
+
+ if (!name)
+ return NULL;
+
+ while (name[i]) {
+ if ((name[j++] = name[i++]) == '/')
+ while (name[i] == '/')
+ i++;
+ }
+ name[j] = '\0';
+ return name;
+}
+
+static char *find_name(const char *line, char *def, int p_value, int terminate)
+{
+ int len;
+ const char *start = NULL;
+
+ if (p_value == 0)
+ start = line;
+
+ if (*line == '"') {
+ struct strbuf name = STRBUF_INIT;
+
+ /*
+ * Proposed "new-style" GNU patch/diff format; see
+ * http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
+ */
+ if (!unquote_c_style(&name, line, NULL)) {
+ char *cp;
+
+ for (cp = name.buf; p_value; p_value--) {
+ cp = strchr(cp, '/');
+ if (!cp)
+ break;
+ cp++;
+ }
+ if (cp) {
+ /* name can later be freed, so we need
+ * to memmove, not just return cp
+ */
+ strbuf_remove(&name, 0, cp - name.buf);
+ free(def);
+ if (root)
+ strbuf_insert(&name, 0, root, root_len);
+ return squash_slash(strbuf_detach(&name, NULL));
+ }
+ }
+ strbuf_release(&name);
+ }
+
+ for (;;) {
+ char c = *line;
+
+ if (isspace(c)) {
+ if (c == '\n')
+ break;
+ if (name_terminate(start, line-start, c, terminate))
+ break;
+ }
+ line++;
+ if (c == '/' && !--p_value)
+ start = line;
+ }
+ if (!start)
+ return squash_slash(def);
+ len = line - start;
+ if (!len)
+ return squash_slash(def);
+
+ /*
+ * Generally we prefer the shorter name, especially
+ * if the other one is just a variation of that with
+ * something else tacked on to the end (ie "file.orig"
+ * or "file~").
+ */
+ if (def) {
+ int deflen = strlen(def);
+ if (deflen < len && !strncmp(start, def, deflen))
+ return squash_slash(def);
+ free(def);
+ }
+
+ if (root) {
+ char *ret = xmalloc(root_len + len + 1);
+ strcpy(ret, root);
+ memcpy(ret + root_len, start, len);
+ ret[root_len + len] = '\0';
+ return squash_slash(ret);
+ }
+
+ return squash_slash(xmemdupz(start, len));
+}
+
+static int count_slashes(const char *cp)
+{
+ int cnt = 0;
+ char ch;
+
+ while ((ch = *cp++))
+ if (ch == '/')
+ cnt++;
+ return cnt;
+}
+
+/*
+ * Given the string after "--- " or "+++ ", guess the appropriate
+ * p_value for the given patch.
+ */
+static int guess_p_value(const char *nameline)
+{
+ char *name, *cp;
+ int val = -1;
+
+ if (is_dev_null(nameline))
+ return -1;
+ name = find_name(nameline, NULL, 0, TERM_SPACE | TERM_TAB);
+ if (!name)
+ return -1;
+ cp = strchr(name, '/');
+ if (!cp)
+ val = 0;
+ else if (prefix) {
+ /*
+ * Does it begin with "a/$our-prefix" and such? Then this is
+ * very likely to apply to our directory.
+ */
+ if (!strncmp(name, prefix, prefix_length))
+ val = count_slashes(prefix);
+ else {
+ cp++;
+ if (!strncmp(cp, prefix, prefix_length))
+ val = count_slashes(prefix) + 1;
+ }
+ }
+ free(name);
+ return val;
+}
+
+/*
+ * Does the ---/+++ line has the POSIX timestamp after the last HT?
+ * GNU diff puts epoch there to signal a creation/deletion event. Is
+ * this such a timestamp?
+ */
+static int has_epoch_timestamp(const char *nameline)
+{
+ /*
+ * We are only interested in epoch timestamp; any non-zero
+ * fraction cannot be one, hence "(\.0+)?" in the regexp below.
+ * For the same reason, the date must be either 1969-12-31 or
+ * 1970-01-01, and the seconds part must be "00".
+ */
+ const char stamp_regexp[] =
+ "^(1969-12-31|1970-01-01)"
+ " "
+ "[0-2][0-9]:[0-5][0-9]:00(\\.0+)?"
+ " "
+ "([-+][0-2][0-9][0-5][0-9])\n";
+ const char *timestamp = NULL, *cp;
+ static regex_t *stamp;
+ regmatch_t m[10];
+ int zoneoffset;
+ int hourminute;
+ int status;
+
+ for (cp = nameline; *cp != '\n'; cp++) {
+ if (*cp == '\t')
+ timestamp = cp + 1;
+ }
+ if (!timestamp)
+ return 0;
+ if (!stamp) {
+ stamp = xmalloc(sizeof(*stamp));
+ if (regcomp(stamp, stamp_regexp, REG_EXTENDED)) {
+ warning("Cannot prepare timestamp regexp %s",
+ stamp_regexp);
+ return 0;
+ }
+ }
+
+ status = regexec(stamp, timestamp, ARRAY_SIZE(m), m, 0);
+ if (status) {
+ if (status != REG_NOMATCH)
+ warning("regexec returned %d for input: %s",
+ status, timestamp);
+ return 0;
+ }
+
+ zoneoffset = strtol(timestamp + m[3].rm_so + 1, NULL, 10);
+ zoneoffset = (zoneoffset / 100) * 60 + (zoneoffset % 100);
+ if (timestamp[m[3].rm_so] == '-')
+ zoneoffset = -zoneoffset;
+
+ /*
+ * YYYY-MM-DD hh:mm:ss must be from either 1969-12-31
+ * (west of GMT) or 1970-01-01 (east of GMT)
+ */
+ if ((zoneoffset < 0 && memcmp(timestamp, "1969-12-31", 10)) ||
+ (0 <= zoneoffset && memcmp(timestamp, "1970-01-01", 10)))
+ return 0;
+
+ hourminute = (strtol(timestamp + 11, NULL, 10) * 60 +
+ strtol(timestamp + 14, NULL, 10) -
+ zoneoffset);
+
+ return ((zoneoffset < 0 && hourminute == 1440) ||
+ (0 <= zoneoffset && !hourminute));
+}
+
+/*
+ * Get the name etc info from the ---/+++ lines of a traditional patch header
+ *
+ * FIXME! The end-of-filename heuristics are kind of screwy. For existing
+ * files, we can happily check the index for a match, but for creating a
+ * new file we should try to match whatever "patch" does. I have no idea.
+ */
+static void parse_traditional_patch(const char *first, const char *second, struct patch *patch)
+{
+ char *name;
+
+ first += 4; /* skip "--- " */
+ second += 4; /* skip "+++ " */
+ if (!p_value_known) {
+ int p, q;
+ p = guess_p_value(first);
+ q = guess_p_value(second);
+ if (p < 0) p = q;
+ if (0 <= p && p == q) {
+ p_value = p;
+ p_value_known = 1;
+ }
+ }
+ if (is_dev_null(first)) {
+ patch->is_new = 1;
+ patch->is_delete = 0;
+ name = find_name(second, NULL, p_value, TERM_SPACE | TERM_TAB);
+ patch->new_name = name;
+ } else if (is_dev_null(second)) {
+ patch->is_new = 0;
+ patch->is_delete = 1;
+ name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
+ patch->old_name = name;
+ } else {
+ name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
+ name = find_name(second, name, p_value, TERM_SPACE | TERM_TAB);
+ if (has_epoch_timestamp(first)) {
+ patch->is_new = 1;
+ patch->is_delete = 0;
+ patch->new_name = name;
+ } else if (has_epoch_timestamp(second)) {
+ patch->is_new = 0;
+ patch->is_delete = 1;
+ patch->old_name = name;
+ } else {
+ patch->old_name = patch->new_name = name;
+ }
+ }
+ if (!name)
+ die("unable to find filename in patch at line %d", linenr);
+}
+
+static int gitdiff_hdrend(const char *line, struct patch *patch)
+{
+ return -1;
+}
+
+/*
+ * We're anal about diff header consistency, to make
+ * sure that we don't end up having strange ambiguous
+ * patches floating around.
+ *
+ * As a result, gitdiff_{old|new}name() will check
+ * their names against any previous information, just
+ * to make sure..
+ */
+static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew)
+{
+ if (!orig_name && !isnull)
+ return find_name(line, NULL, p_value, TERM_TAB);
+
+ if (orig_name) {
+ int len;
+ const char *name;
+ char *another;
+ name = orig_name;
+ len = strlen(name);
+ if (isnull)
+ die("git apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr);
+ another = find_name(line, NULL, p_value, TERM_TAB);
+ if (!another || memcmp(another, name, len + 1))
+ die("git apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
+ free(another);
+ return orig_name;
+ }
+ else {
+ /* expect "/dev/null" */
+ if (memcmp("/dev/null", line, 9) || line[9] != '\n')
+ die("git apply: bad git-diff - expected /dev/null on line %d", linenr);
+ return NULL;
+ }
+}
+
+static int gitdiff_oldname(const char *line, struct patch *patch)
+{
+ patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name, "old");
+ return 0;
+}
+
+static int gitdiff_newname(const char *line, struct patch *patch)
+{
+ patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name, "new");
+ return 0;
+}
+
+static int gitdiff_oldmode(const char *line, struct patch *patch)
+{
+ patch->old_mode = strtoul(line, NULL, 8);
+ return 0;
+}
+
+static int gitdiff_newmode(const char *line, struct patch *patch)
+{
+ patch->new_mode = strtoul(line, NULL, 8);
+ return 0;
+}
+
+static int gitdiff_delete(const char *line, struct patch *patch)
+{
+ patch->is_delete = 1;
+ patch->old_name = patch->def_name;
+ return gitdiff_oldmode(line, patch);
+}
+
+static int gitdiff_newfile(const char *line, struct patch *patch)
+{
+ patch->is_new = 1;
+ patch->new_name = patch->def_name;
+ return gitdiff_newmode(line, patch);
+}
+
+static int gitdiff_copysrc(const char *line, struct patch *patch)
+{
+ patch->is_copy = 1;
+ patch->old_name = find_name(line, NULL, 0, 0);
+ return 0;
+}
+
+static int gitdiff_copydst(const char *line, struct patch *patch)
+{
+ patch->is_copy = 1;
+ patch->new_name = find_name(line, NULL, 0, 0);
+ return 0;
+}
+
+static int gitdiff_renamesrc(const char *line, struct patch *patch)
+{
+ patch->is_rename = 1;
+ patch->old_name = find_name(line, NULL, 0, 0);
+ return 0;
+}
+
+static int gitdiff_renamedst(const char *line, struct patch *patch)
+{
+ patch->is_rename = 1;
+ patch->new_name = find_name(line, NULL, 0, 0);
+ return 0;
+}
+
+static int gitdiff_similarity(const char *line, struct patch *patch)
+{
+ if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
+ patch->score = 0;
+ return 0;
+}
+
+static int gitdiff_dissimilarity(const char *line, struct patch *patch)
+{
+ if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
+ patch->score = 0;
+ return 0;
+}
+
+static int gitdiff_index(const char *line, struct patch *patch)
+{
+ /*
+ * index line is N hexadecimal, "..", N hexadecimal,
+ * and optional space with octal mode.
+ */
+ const char *ptr, *eol;
+ int len;
+
+ ptr = strchr(line, '.');
+ if (!ptr || ptr[1] != '.' || 40 < ptr - line)
+ return 0;
+ len = ptr - line;
+ memcpy(patch->old_sha1_prefix, line, len);
+ patch->old_sha1_prefix[len] = 0;
+
+ line = ptr + 2;
+ ptr = strchr(line, ' ');
+ eol = strchr(line, '\n');
+
+ if (!ptr || eol < ptr)
+ ptr = eol;
+ len = ptr - line;
+
+ if (40 < len)
+ return 0;
+ memcpy(patch->new_sha1_prefix, line, len);
+ patch->new_sha1_prefix[len] = 0;
+ if (*ptr == ' ')
+ patch->old_mode = strtoul(ptr+1, NULL, 8);
+ return 0;
+}
+
+/*
+ * This is normal for a diff that doesn't change anything: we'll fall through
+ * into the next diff. Tell the parser to break out.
+ */
+static int gitdiff_unrecognized(const char *line, struct patch *patch)
+{
+ return -1;
+}
+
+static const char *stop_at_slash(const char *line, int llen)
+{
+ int nslash = p_value;
+ int i;
+
+ for (i = 0; i < llen; i++) {
+ int ch = line[i];
+ if (ch == '/' && --nslash <= 0)
+ return &line[i];
+ }
+ return NULL;
+}
+
+/*
+ * This is to extract the same name that appears on "diff --git"
+ * line. We do not find and return anything if it is a rename
+ * patch, and it is OK because we will find the name elsewhere.
+ * We need to reliably find name only when it is mode-change only,
+ * creation or deletion of an empty file. In any of these cases,
+ * both sides are the same name under a/ and b/ respectively.
+ */
+static char *git_header_name(char *line, int llen)
+{
+ const char *name;
+ const char *second = NULL;
+ size_t len;
+
+ line += strlen("diff --git ");
+ llen -= strlen("diff --git ");
+
+ if (*line == '"') {
+ const char *cp;
+ struct strbuf first = STRBUF_INIT;
+ struct strbuf sp = STRBUF_INIT;
+
+ if (unquote_c_style(&first, line, &second))
+ goto free_and_fail1;
+
+ /* advance to the first slash */
+ cp = stop_at_slash(first.buf, first.len);
+ /* we do not accept absolute paths */
+ if (!cp || cp == first.buf)
+ goto free_and_fail1;
+ strbuf_remove(&first, 0, cp + 1 - first.buf);
+
+ /*
+ * second points at one past closing dq of name.
+ * find the second name.
+ */
+ while ((second < line + llen) && isspace(*second))
+ second++;
+
+ if (line + llen <= second)
+ goto free_and_fail1;
+ if (*second == '"') {
+ if (unquote_c_style(&sp, second, NULL))
+ goto free_and_fail1;
+ cp = stop_at_slash(sp.buf, sp.len);
+ if (!cp || cp == sp.buf)
+ goto free_and_fail1;
+ /* They must match, otherwise ignore */
+ if (strcmp(cp + 1, first.buf))
+ goto free_and_fail1;
+ strbuf_release(&sp);
+ return strbuf_detach(&first, NULL);
+ }
+
+ /* unquoted second */
+ cp = stop_at_slash(second, line + llen - second);
+ if (!cp || cp == second)
+ goto free_and_fail1;
+ cp++;
+ if (line + llen - cp != first.len + 1 ||
+ memcmp(first.buf, cp, first.len))
+ goto free_and_fail1;
+ return strbuf_detach(&first, NULL);
+
+ free_and_fail1:
+ strbuf_release(&first);
+ strbuf_release(&sp);
+ return NULL;
+ }
+
+ /* unquoted first name */
+ name = stop_at_slash(line, llen);
+ if (!name || name == line)
+ return NULL;
+ name++;
+
+ /*
+ * since the first name is unquoted, a dq if exists must be
+ * the beginning of the second name.
+ */
+ for (second = name; second < line + llen; second++) {
+ if (*second == '"') {
+ struct strbuf sp = STRBUF_INIT;
+ const char *np;
+
+ if (unquote_c_style(&sp, second, NULL))
+ goto free_and_fail2;
+
+ np = stop_at_slash(sp.buf, sp.len);
+ if (!np || np == sp.buf)
+ goto free_and_fail2;
+ np++;
+
+ len = sp.buf + sp.len - np;
+ if (len < second - name &&
+ !strncmp(np, name, len) &&
+ isspace(name[len])) {
+ /* Good */
+ strbuf_remove(&sp, 0, np - sp.buf);
+ return strbuf_detach(&sp, NULL);
+ }
+
+ free_and_fail2:
+ strbuf_release(&sp);
+ return NULL;
+ }
+ }
+
+ /*
+ * Accept a name only if it shows up twice, exactly the same
+ * form.
+ */
+ for (len = 0 ; ; len++) {
+ switch (name[len]) {
+ default:
+ continue;
+ case '\n':
+ return NULL;
+ case '\t': case ' ':
+ second = name+len;
+ for (;;) {
+ char c = *second++;
+ if (c == '\n')
+ return NULL;
+ if (c == '/')
+ break;
+ }
+ if (second[len] == '\n' && !memcmp(name, second, len)) {
+ return xmemdupz(name, len);
+ }
+ }
+ }
+}
+
+/* Verify that we recognize the lines following a git header */
+static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch)
+{
+ unsigned long offset;
+
+ /* A git diff has explicit new/delete information, so we don't guess */
+ patch->is_new = 0;
+ patch->is_delete = 0;
+
+ /*
+ * Some things may not have the old name in the
+ * rest of the headers anywhere (pure mode changes,
+ * or removing or adding empty files), so we get
+ * the default name from the header.
+ */
+ patch->def_name = git_header_name(line, len);
+ if (patch->def_name && root) {
+ char *s = xmalloc(root_len + strlen(patch->def_name) + 1);
+ strcpy(s, root);
+ strcpy(s + root_len, patch->def_name);
+ free(patch->def_name);
+ patch->def_name = s;
+ }
+
+ line += len;
+ size -= len;
+ linenr++;
+ for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) {
+ static const struct opentry {
+ const char *str;
+ int (*fn)(const char *, struct patch *);
+ } optable[] = {
+ { "@@ -", gitdiff_hdrend },
+ { "--- ", gitdiff_oldname },
+ { "+++ ", gitdiff_newname },
+ { "old mode ", gitdiff_oldmode },
+ { "new mode ", gitdiff_newmode },
+ { "deleted file mode ", gitdiff_delete },
+ { "new file mode ", gitdiff_newfile },
+ { "copy from ", gitdiff_copysrc },
+ { "copy to ", gitdiff_copydst },
+ { "rename old ", gitdiff_renamesrc },
+ { "rename new ", gitdiff_renamedst },
+ { "rename from ", gitdiff_renamesrc },
+ { "rename to ", gitdiff_renamedst },
+ { "similarity index ", gitdiff_similarity },
+ { "dissimilarity index ", gitdiff_dissimilarity },
+ { "index ", gitdiff_index },
+ { "", gitdiff_unrecognized },
+ };
+ int i;
+
+ len = linelen(line, size);
+ if (!len || line[len-1] != '\n')
+ break;
+ for (i = 0; i < ARRAY_SIZE(optable); i++) {
+ const struct opentry *p = optable + i;
+ int oplen = strlen(p->str);
+ if (len < oplen || memcmp(p->str, line, oplen))
+ continue;
+ if (p->fn(line + oplen, patch) < 0)
+ return offset;
+ break;
+ }
+ }
+
+ return offset;
+}
+
+static int parse_num(const char *line, unsigned long *p)
+{
+ char *ptr;
+
+ if (!isdigit(*line))
+ return 0;
+ *p = strtoul(line, &ptr, 10);
+ return ptr - line;
+}
+
+static int parse_range(const char *line, int len, int offset, const char *expect,
+ unsigned long *p1, unsigned long *p2)
+{
+ int digits, ex;
+
+ if (offset < 0 || offset >= len)
+ return -1;
+ line += offset;
+ len -= offset;
+
+ digits = parse_num(line, p1);
+ if (!digits)
+ return -1;
+
+ offset += digits;
+ line += digits;
+ len -= digits;
+
+ *p2 = 1;
+ if (*line == ',') {
+ digits = parse_num(line+1, p2);
+ if (!digits)
+ return -1;
+
+ offset += digits+1;
+ line += digits+1;
+ len -= digits+1;
+ }
+
+ ex = strlen(expect);
+ if (ex > len)
+ return -1;
+ if (memcmp(line, expect, ex))
+ return -1;
+
+ return offset + ex;
+}
+
+static void recount_diff(char *line, int size, struct fragment *fragment)
+{
+ int oldlines = 0, newlines = 0, ret = 0;
+
+ if (size < 1) {
+ warning("recount: ignore empty hunk");
+ return;
+ }
+
+ for (;;) {
+ int len = linelen(line, size);
+ size -= len;
+ line += len;
+
+ if (size < 1)
+ break;
+
+ switch (*line) {
+ case ' ': case '\n':
+ newlines++;
+ /* fall through */
+ case '-':
+ oldlines++;
+ continue;
+ case '+':
+ newlines++;
+ continue;
+ case '\\':
+ continue;
+ case '@':
+ ret = size < 3 || prefixcmp(line, "@@ ");
+ break;
+ case 'd':
+ ret = size < 5 || prefixcmp(line, "diff ");
+ break;
+ default:
+ ret = -1;
+ break;
+ }
+ if (ret) {
+ warning("recount: unexpected line: %.*s",
+ (int)linelen(line, size), line);
+ return;
+ }
+ break;
+ }
+ fragment->oldlines = oldlines;
+ fragment->newlines = newlines;
+}
+
+/*
+ * Parse a unified diff fragment header of the
+ * form "@@ -a,b +c,d @@"
+ */
+static int parse_fragment_header(char *line, int len, struct fragment *fragment)
+{
+ int offset;
+
+ if (!len || line[len-1] != '\n')
+ return -1;
+
+ /* Figure out the number of lines in a fragment */
+ offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
+ offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
+
+ return offset;
+}
+
+static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch)
+{
+ unsigned long offset, len;
+
+ patch->is_toplevel_relative = 0;
+ patch->is_rename = patch->is_copy = 0;
+ patch->is_new = patch->is_delete = -1;
+ patch->old_mode = patch->new_mode = 0;
+ patch->old_name = patch->new_name = NULL;
+ for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) {
+ unsigned long nextlen;
+
+ len = linelen(line, size);
+ if (!len)
+ break;
+
+ /* Testing this early allows us to take a few shortcuts.. */
+ if (len < 6)
+ continue;
+
+ /*
+ * Make sure we don't find any unconnected patch fragments.
+ * That's a sign that we didn't find a header, and that a
+ * patch has become corrupted/broken up.
+ */
+ if (!memcmp("@@ -", line, 4)) {
+ struct fragment dummy;
+ if (parse_fragment_header(line, len, &dummy) < 0)
+ continue;
+ die("patch fragment without header at line %d: %.*s",
+ linenr, (int)len-1, line);
+ }
+
+ if (size < len + 6)
+ break;
+
+ /*
+ * Git patch? It might not have a real patch, just a rename
+ * or mode change, so we handle that specially
+ */
+ if (!memcmp("diff --git ", line, 11)) {
+ int git_hdr_len = parse_git_header(line, len, size, patch);
+ if (git_hdr_len <= len)
+ continue;
+ if (!patch->old_name && !patch->new_name) {
+ if (!patch->def_name)
+ die("git diff header lacks filename information when removing "
+ "%d leading pathname components (line %d)" , p_value, linenr);
+ patch->old_name = patch->new_name = patch->def_name;
+ }
+ patch->is_toplevel_relative = 1;
+ *hdrsize = git_hdr_len;
+ return offset;
+ }
+
+ /* --- followed by +++ ? */
+ if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4))
+ continue;
+
+ /*
+ * We only accept unified patches, so we want it to
+ * at least have "@@ -a,b +c,d @@\n", which is 14 chars
+ * minimum ("@@ -0,0 +1 @@\n" is the shortest).
+ */
+ nextlen = linelen(line + len, size - len);
+ if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
+ continue;
+
+ /* Ok, we'll consider it a patch */
+ parse_traditional_patch(line, line+len, patch);
+ *hdrsize = len + nextlen;
+ linenr += 2;
+ return offset;
+ }
+ return -1;
+}
+
+static void record_ws_error(unsigned result, const char *line, int len, int linenr)
+{
+ char *err;
+
+ if (!result)
+ return;
+
+ whitespace_error++;
+ if (squelch_whitespace_errors &&
+ squelch_whitespace_errors < whitespace_error)
+ return;
+
+ err = whitespace_error_string(result);
+ fprintf(stderr, "%s:%d: %s.\n%.*s\n",
+ patch_input_file, linenr, err, len, line);
+ free(err);
+}
+
+static void check_whitespace(const char *line, int len, unsigned ws_rule)
+{
+ unsigned result = ws_check(line + 1, len - 1, ws_rule);
+
+ record_ws_error(result, line + 1, len - 2, linenr);
+}
+
+/*
+ * Parse a unified diff. Note that this really needs to parse each
+ * fragment separately, since the only way to know the difference
+ * between a "---" that is part of a patch, and a "---" that starts
+ * the next patch is to look at the line counts..
+ */
+static int parse_fragment(char *line, unsigned long size,
+ struct patch *patch, struct fragment *fragment)
+{
+ int added, deleted;
+ int len = linelen(line, size), offset;
+ unsigned long oldlines, newlines;
+ unsigned long leading, trailing;
+
+ offset = parse_fragment_header(line, len, fragment);
+ if (offset < 0)
+ return -1;
+ if (offset > 0 && patch->recount)
+ recount_diff(line + offset, size - offset, fragment);
+ oldlines = fragment->oldlines;
+ newlines = fragment->newlines;
+ leading = 0;
+ trailing = 0;
+
+ /* Parse the thing.. */
+ line += len;
+ size -= len;
+ linenr++;
+ added = deleted = 0;
+ for (offset = len;
+ 0 < size;
+ offset += len, size -= len, line += len, linenr++) {
+ if (!oldlines && !newlines)
+ break;
+ len = linelen(line, size);
+ if (!len || line[len-1] != '\n')
+ return -1;
+ switch (*line) {
+ default:
+ return -1;
+ case '\n': /* newer GNU diff, an empty context line */
+ case ' ':
+ oldlines--;
+ newlines--;
+ if (!deleted && !added)
+ leading++;
+ trailing++;
+ break;
+ case '-':
+ if (apply_in_reverse &&
+ ws_error_action != nowarn_ws_error)
+ check_whitespace(line, len, patch->ws_rule);
+ deleted++;
+ oldlines--;
+ trailing = 0;
+ break;
+ case '+':
+ if (!apply_in_reverse &&
+ ws_error_action != nowarn_ws_error)
+ check_whitespace(line, len, patch->ws_rule);
+ added++;
+ newlines--;
+ trailing = 0;
+ break;
+
+ /*
+ * We allow "\ No newline at end of file". Depending
+ * on locale settings when the patch was produced we
+ * don't know what this line looks like. The only
+ * thing we do know is that it begins with "\ ".
+ * Checking for 12 is just for sanity check -- any
+ * l10n of "\ No newline..." is at least that long.
+ */
+ case '\\':
+ if (len < 12 || memcmp(line, "\\ ", 2))
+ return -1;
+ break;
+ }
+ }
+ if (oldlines || newlines)
+ return -1;
+ fragment->leading = leading;
+ fragment->trailing = trailing;
+
+ /*
+ * If a fragment ends with an incomplete line, we failed to include
+ * it in the above loop because we hit oldlines == newlines == 0
+ * before seeing it.
+ */
+ if (12 < size && !memcmp(line, "\\ ", 2))
+ offset += linelen(line, size);
+
+ patch->lines_added += added;
+ patch->lines_deleted += deleted;
+
+ if (0 < patch->is_new && oldlines)
+ return error("new file depends on old contents");
+ if (0 < patch->is_delete && newlines)
+ return error("deleted file still has contents");
+ return offset;
+}
+
+static int parse_single_patch(char *line, unsigned long size, struct patch *patch)
+{
+ unsigned long offset = 0;
+ unsigned long oldlines = 0, newlines = 0, context = 0;
+ struct fragment **fragp = &patch->fragments;
+
+ while (size > 4 && !memcmp(line, "@@ -", 4)) {
+ struct fragment *fragment;
+ int len;
+
+ fragment = xcalloc(1, sizeof(*fragment));
+ fragment->linenr = linenr;
+ len = parse_fragment(line, size, patch, fragment);
+ if (len <= 0)
+ die("corrupt patch at line %d", linenr);
+ fragment->patch = line;
+ fragment->size = len;
+ oldlines += fragment->oldlines;
+ newlines += fragment->newlines;
+ context += fragment->leading + fragment->trailing;
+
+ *fragp = fragment;
+ fragp = &fragment->next;
+
+ offset += len;
+ line += len;
+ size -= len;
+ }
+
+ /*
+ * If something was removed (i.e. we have old-lines) it cannot
+ * be creation, and if something was added it cannot be
+ * deletion. However, the reverse is not true; --unified=0
+ * patches that only add are not necessarily creation even
+ * though they do not have any old lines, and ones that only
+ * delete are not necessarily deletion.
+ *
+ * Unfortunately, a real creation/deletion patch do _not_ have
+ * any context line by definition, so we cannot safely tell it
+ * apart with --unified=0 insanity. At least if the patch has
+ * more than one hunk it is not creation or deletion.
+ */
+ if (patch->is_new < 0 &&
+ (oldlines || (patch->fragments && patch->fragments->next)))
+ patch->is_new = 0;
+ if (patch->is_delete < 0 &&
+ (newlines || (patch->fragments && patch->fragments->next)))
+ patch->is_delete = 0;
+
+ if (0 < patch->is_new && oldlines)
+ die("new file %s depends on old contents", patch->new_name);
+ if (0 < patch->is_delete && newlines)
+ die("deleted file %s still has contents", patch->old_name);
+ if (!patch->is_delete && !newlines && context)
+ fprintf(stderr, "** warning: file %s becomes empty but "
+ "is not deleted\n", patch->new_name);
+
+ return offset;
+}
+
+static inline int metadata_changes(struct patch *patch)
+{
+ return patch->is_rename > 0 ||
+ patch->is_copy > 0 ||
+ patch->is_new > 0 ||
+ patch->is_delete ||
+ (patch->old_mode && patch->new_mode &&
+ patch->old_mode != patch->new_mode);
+}
+
+static char *inflate_it(const void *data, unsigned long size,
+ unsigned long inflated_size)
+{
+ z_stream stream;
+ void *out;
+ int st;
+
+ memset(&stream, 0, sizeof(stream));
+
+ stream.next_in = (unsigned char *)data;
+ stream.avail_in = size;
+ stream.next_out = out = xmalloc(inflated_size);
+ stream.avail_out = inflated_size;
+ git_inflate_init(&stream);
+ st = git_inflate(&stream, Z_FINISH);
+ git_inflate_end(&stream);
+ if ((st != Z_STREAM_END) || stream.total_out != inflated_size) {
+ free(out);
+ return NULL;
+ }
+ return out;
+}
+
+static struct fragment *parse_binary_hunk(char **buf_p,
+ unsigned long *sz_p,
+ int *status_p,
+ int *used_p)
+{
+ /*
+ * Expect a line that begins with binary patch method ("literal"
+ * or "delta"), followed by the length of data before deflating.
+ * a sequence of 'length-byte' followed by base-85 encoded data
+ * should follow, terminated by a newline.
+ *
+ * Each 5-byte sequence of base-85 encodes up to 4 bytes,
+ * and we would limit the patch line to 66 characters,
+ * so one line can fit up to 13 groups that would decode
+ * to 52 bytes max. The length byte 'A'-'Z' corresponds
+ * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
+ */
+ int llen, used;
+ unsigned long size = *sz_p;
+ char *buffer = *buf_p;
+ int patch_method;
+ unsigned long origlen;
+ char *data = NULL;
+ int hunk_size = 0;
+ struct fragment *frag;
+
+ llen = linelen(buffer, size);
+ used = llen;
+
+ *status_p = 0;
+
+ if (!prefixcmp(buffer, "delta ")) {
+ patch_method = BINARY_DELTA_DEFLATED;
+ origlen = strtoul(buffer + 6, NULL, 10);
+ }
+ else if (!prefixcmp(buffer, "literal ")) {
+ patch_method = BINARY_LITERAL_DEFLATED;
+ origlen = strtoul(buffer + 8, NULL, 10);
+ }
+ else
+ return NULL;
+
+ linenr++;
+ buffer += llen;
+ while (1) {
+ int byte_length, max_byte_length, newsize;
+ llen = linelen(buffer, size);
+ used += llen;
+ linenr++;
+ if (llen == 1) {
+ /* consume the blank line */
+ buffer++;
+ size--;
+ break;
+ }
+ /*
+ * Minimum line is "A00000\n" which is 7-byte long,
+ * and the line length must be multiple of 5 plus 2.
+ */
+ if ((llen < 7) || (llen-2) % 5)
+ goto corrupt;
+ max_byte_length = (llen - 2) / 5 * 4;
+ byte_length = *buffer;
+ if ('A' <= byte_length && byte_length <= 'Z')
+ byte_length = byte_length - 'A' + 1;
+ else if ('a' <= byte_length && byte_length <= 'z')
+ byte_length = byte_length - 'a' + 27;
+ else
+ goto corrupt;
+ /* if the input length was not multiple of 4, we would
+ * have filler at the end but the filler should never
+ * exceed 3 bytes
+ */
+ if (max_byte_length < byte_length ||
+ byte_length <= max_byte_length - 4)
+ goto corrupt;
+ newsize = hunk_size + byte_length;
+ data = xrealloc(data, newsize);
+ if (decode_85(data + hunk_size, buffer + 1, byte_length))
+ goto corrupt;
+ hunk_size = newsize;
+ buffer += llen;
+ size -= llen;
+ }
+
+ frag = xcalloc(1, sizeof(*frag));
+ frag->patch = inflate_it(data, hunk_size, origlen);
+ if (!frag->patch)
+ goto corrupt;
+ free(data);
+ frag->size = origlen;
+ *buf_p = buffer;
+ *sz_p = size;
+ *used_p = used;
+ frag->binary_patch_method = patch_method;
+ return frag;
+
+ corrupt:
+ free(data);
+ *status_p = -1;
+ error("corrupt binary patch at line %d: %.*s",
+ linenr-1, llen-1, buffer);
+ return NULL;
+}
+
+static int parse_binary(char *buffer, unsigned long size, struct patch *patch)
+{
+ /*
+ * We have read "GIT binary patch\n"; what follows is a line
+ * that says the patch method (currently, either "literal" or
+ * "delta") and the length of data before deflating; a
+ * sequence of 'length-byte' followed by base-85 encoded data
+ * follows.
+ *
+ * When a binary patch is reversible, there is another binary
+ * hunk in the same format, starting with patch method (either
+ * "literal" or "delta") with the length of data, and a sequence
+ * of length-byte + base-85 encoded data, terminated with another
+ * empty line. This data, when applied to the postimage, produces
+ * the preimage.
+ */
+ struct fragment *forward;
+ struct fragment *reverse;
+ int status;
+ int used, used_1;
+
+ forward = parse_binary_hunk(&buffer, &size, &status, &used);
+ if (!forward && !status)
+ /* there has to be one hunk (forward hunk) */
+ return error("unrecognized binary patch at line %d", linenr-1);
+ if (status)
+ /* otherwise we already gave an error message */
+ return status;
+
+ reverse = parse_binary_hunk(&buffer, &size, &status, &used_1);
+ if (reverse)
+ used += used_1;
+ else if (status) {
+ /*
+ * Not having reverse hunk is not an error, but having
+ * a corrupt reverse hunk is.
+ */
+ free((void*) forward->patch);
+ free(forward);
+ return status;
+ }
+ forward->next = reverse;
+ patch->fragments = forward;
+ patch->is_binary = 1;
+ return used;
+}
+
+static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
+{
+ int hdrsize, patchsize;
+ int offset = find_header(buffer, size, &hdrsize, patch);
+
+ if (offset < 0)
+ return offset;
+
+ patch->ws_rule = whitespace_rule(patch->new_name
+ ? patch->new_name
+ : patch->old_name);
+
+ patchsize = parse_single_patch(buffer + offset + hdrsize,
+ size - offset - hdrsize, patch);
+
+ if (!patchsize) {
+ static const char *binhdr[] = {
+ "Binary files ",
+ "Files ",
+ NULL,
+ };
+ static const char git_binary[] = "GIT binary patch\n";
+ int i;
+ int hd = hdrsize + offset;
+ unsigned long llen = linelen(buffer + hd, size - hd);
+
+ if (llen == sizeof(git_binary) - 1 &&
+ !memcmp(git_binary, buffer + hd, llen)) {
+ int used;
+ linenr++;
+ used = parse_binary(buffer + hd + llen,
+ size - hd - llen, patch);
+ if (used)
+ patchsize = used + llen;
+ else
+ patchsize = 0;
+ }
+ else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) {
+ for (i = 0; binhdr[i]; i++) {
+ int len = strlen(binhdr[i]);
+ if (len < size - hd &&
+ !memcmp(binhdr[i], buffer + hd, len)) {
+ linenr++;
+ patch->is_binary = 1;
+ patchsize = llen;
+ break;
+ }
+ }
+ }
+
+ /* Empty patch cannot be applied if it is a text patch
+ * without metadata change. A binary patch appears
+ * empty to us here.
+ */
+ if ((apply || check) &&
+ (!patch->is_binary && !metadata_changes(patch)))
+ die("patch with only garbage at line %d", linenr);
+ }
+
+ return offset + hdrsize + patchsize;
+}
+
+#define swap(a,b) myswap((a),(b),sizeof(a))
+
+#define myswap(a, b, size) do { \
+ unsigned char mytmp[size]; \
+ memcpy(mytmp, &a, size); \
+ memcpy(&a, &b, size); \
+ memcpy(&b, mytmp, size); \
+} while (0)
+
+static void reverse_patches(struct patch *p)
+{
+ for (; p; p = p->next) {
+ struct fragment *frag = p->fragments;
+
+ swap(p->new_name, p->old_name);
+ swap(p->new_mode, p->old_mode);
+ swap(p->is_new, p->is_delete);
+ swap(p->lines_added, p->lines_deleted);
+ swap(p->old_sha1_prefix, p->new_sha1_prefix);
+
+ for (; frag; frag = frag->next) {
+ swap(frag->newpos, frag->oldpos);
+ swap(frag->newlines, frag->oldlines);
+ }
+ }
+}
+
+static const char pluses[] =
+"++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
+static const char minuses[]=
+"----------------------------------------------------------------------";
+
+static void show_stats(struct patch *patch)
+{
+ struct strbuf qname = STRBUF_INIT;
+ char *cp = patch->new_name ? patch->new_name : patch->old_name;
+ int max, add, del;
+
+ quote_c_style(cp, &qname, NULL, 0);
+
+ /*
+ * "scale" the filename
+ */
+ max = max_len;
+ if (max > 50)
+ max = 50;
+
+ if (qname.len > max) {
+ cp = strchr(qname.buf + qname.len + 3 - max, '/');
+ if (!cp)
+ cp = qname.buf + qname.len + 3 - max;
+ strbuf_splice(&qname, 0, cp - qname.buf, "...", 3);
+ }
+
+ if (patch->is_binary) {
+ printf(" %-*s | Bin\n", max, qname.buf);
+ strbuf_release(&qname);
+ return;
+ }
+
+ printf(" %-*s |", max, qname.buf);
+ strbuf_release(&qname);
+
+ /*
+ * scale the add/delete
+ */
+ max = max + max_change > 70 ? 70 - max : max_change;
+ add = patch->lines_added;
+ del = patch->lines_deleted;
+
+ if (max_change > 0) {
+ int total = ((add + del) * max + max_change / 2) / max_change;
+ add = (add * max + max_change / 2) / max_change;
+ del = total - add;
+ }
+ printf("%5d %.*s%.*s\n", patch->lines_added + patch->lines_deleted,
+ add, pluses, del, minuses);
+}
+
+static int read_old_data(struct stat *st, const char *path, struct strbuf *buf)
+{
+ switch (st->st_mode & S_IFMT) {
+ case S_IFLNK:
+ if (strbuf_readlink(buf, path, st->st_size) < 0)
+ return error("unable to read symlink %s", path);
+ return 0;
+ case S_IFREG:
+ if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
+ return error("unable to open or read %s", path);
+ convert_to_git(path, buf->buf, buf->len, buf, 0);
+ return 0;
+ default:
+ return -1;
+ }
+}
+
+/*
+ * Update the preimage, and the common lines in postimage,
+ * from buffer buf of length len. If postlen is 0 the postimage
+ * is updated in place, otherwise it's updated on a new buffer
+ * of length postlen
+ */
+
+static void update_pre_post_images(struct image *preimage,
+ struct image *postimage,
+ char *buf,
+ size_t len, size_t postlen)
+{
+ int i, ctx;
+ char *new, *old, *fixed;
+ struct image fixed_preimage;
+
+ /*
+ * Update the preimage with whitespace fixes. Note that we
+ * are not losing preimage->buf -- apply_one_fragment() will
+ * free "oldlines".
+ */
+ prepare_image(&fixed_preimage, buf, len, 1);
+ assert(fixed_preimage.nr == preimage->nr);
+ for (i = 0; i < preimage->nr; i++)
+ fixed_preimage.line[i].flag = preimage->line[i].flag;
+ free(preimage->line_allocated);
+ *preimage = fixed_preimage;
+
+ /*
+ * Adjust the common context lines in postimage. This can be
+ * done in-place when we are just doing whitespace fixing,
+ * which does not make the string grow, but needs a new buffer
+ * when ignoring whitespace causes the update, since in this case
+ * we could have e.g. tabs converted to multiple spaces.
+ * We trust the caller to tell us if the update can be done
+ * in place (postlen==0) or not.
+ */
+ old = postimage->buf;
+ if (postlen)
+ new = postimage->buf = xmalloc(postlen);
+ else
+ new = old;
+ fixed = preimage->buf;
+ for (i = ctx = 0; i < postimage->nr; i++) {
+ size_t len = postimage->line[i].len;
+ if (!(postimage->line[i].flag & LINE_COMMON)) {
+ /* an added line -- no counterparts in preimage */
+ memmove(new, old, len);
+ old += len;
+ new += len;
+ continue;
+ }
+
+ /* a common context -- skip it in the original postimage */
+ old += len;
+
+ /* and find the corresponding one in the fixed preimage */
+ while (ctx < preimage->nr &&
+ !(preimage->line[ctx].flag & LINE_COMMON)) {
+ fixed += preimage->line[ctx].len;
+ ctx++;
+ }
+ if (preimage->nr <= ctx)
+ die("oops");
+
+ /* and copy it in, while fixing the line length */
+ len = preimage->line[ctx].len;
+ memcpy(new, fixed, len);
+ new += len;
+ fixed += len;
+ postimage->line[i].len = len;
+ ctx++;
+ }
+
+ /* Fix the length of the whole thing */
+ postimage->len = new - postimage->buf;
+}
+
+static int match_fragment(struct image *img,
+ struct image *preimage,
+ struct image *postimage,
+ unsigned long try,
+ int try_lno,
+ unsigned ws_rule,
+ int match_beginning, int match_end)
+{
+ int i;
+ char *fixed_buf, *buf, *orig, *target;
+
+ if (preimage->nr + try_lno > img->nr)
+ return 0;
+
+ if (match_beginning && try_lno)
+ return 0;
+
+ if (match_end && preimage->nr + try_lno != img->nr)
+ return 0;
+
+ /* Quick hash check */
+ for (i = 0; i < preimage->nr; i++)
+ if (preimage->line[i].hash != img->line[try_lno + i].hash)
+ return 0;
+
+ /*
+ * Do we have an exact match? If we were told to match
+ * at the end, size must be exactly at try+fragsize,
+ * otherwise try+fragsize must be still within the preimage,
+ * and either case, the old piece should match the preimage
+ * exactly.
+ */
+ if ((match_end
+ ? (try + preimage->len == img->len)
+ : (try + preimage->len <= img->len)) &&
+ !memcmp(img->buf + try, preimage->buf, preimage->len))
+ return 1;
+
+ /*
+ * No exact match. If we are ignoring whitespace, run a line-by-line
+ * fuzzy matching. We collect all the line length information because
+ * we need it to adjust whitespace if we match.
+ */
+ if (ws_ignore_action == ignore_ws_change) {
+ size_t imgoff = 0;
+ size_t preoff = 0;
+ size_t postlen = postimage->len;
+ for (i = 0; i < preimage->nr; i++) {
+ size_t prelen = preimage->line[i].len;
+ size_t imglen = img->line[try_lno+i].len;
+
+ if (!fuzzy_matchlines(img->buf + try + imgoff, imglen,
+ preimage->buf + preoff, prelen))
+ return 0;
+ if (preimage->line[i].flag & LINE_COMMON)
+ postlen += imglen - prelen;
+ imgoff += imglen;
+ preoff += prelen;
+ }
+
+ /*
+ * Ok, the preimage matches with whitespace fuzz. Update it and
+ * the common postimage lines to use the same whitespace as the
+ * target. imgoff now holds the true length of the target that
+ * matches the preimage, and we need to update the line lengths
+ * of the preimage to match the target ones.
+ */
+ fixed_buf = xmalloc(imgoff);
+ memcpy(fixed_buf, img->buf + try, imgoff);
+ for (i = 0; i < preimage->nr; i++)
+ preimage->line[i].len = img->line[try_lno+i].len;
+
+ /*
+ * Update the preimage buffer and the postimage context lines.
+ */
+ update_pre_post_images(preimage, postimage,
+ fixed_buf, imgoff, postlen);
+ return 1;
+ }
+
+ if (ws_error_action != correct_ws_error)
+ return 0;
+
+ /*
+ * The hunk does not apply byte-by-byte, but the hash says
+ * it might with whitespace fuzz. We haven't been asked to
+ * ignore whitespace, we were asked to correct whitespace
+ * errors, so let's try matching after whitespace correction.
+ */
+ fixed_buf = xmalloc(preimage->len + 1);
+ buf = fixed_buf;
+ orig = preimage->buf;
+ target = img->buf + try;
+ for (i = 0; i < preimage->nr; i++) {
+ size_t fixlen; /* length after fixing the preimage */
+ size_t oldlen = preimage->line[i].len;
+ size_t tgtlen = img->line[try_lno + i].len;
+ size_t tgtfixlen; /* length after fixing the target line */
+ char tgtfixbuf[1024], *tgtfix;
+ int match;
+
+ /* Try fixing the line in the preimage */
+ fixlen = ws_fix_copy(buf, orig, oldlen, ws_rule, NULL);
+
+ /* Try fixing the line in the target */
+ if (sizeof(tgtfixbuf) > tgtlen)
+ tgtfix = tgtfixbuf;
+ else
+ tgtfix = xmalloc(tgtlen);
+ tgtfixlen = ws_fix_copy(tgtfix, target, tgtlen, ws_rule, NULL);
+
+ /*
+ * If they match, either the preimage was based on
+ * a version before our tree fixed whitespace breakage,
+ * or we are lacking a whitespace-fix patch the tree
+ * the preimage was based on already had (i.e. target
+ * has whitespace breakage, the preimage doesn't).
+ * In either case, we are fixing the whitespace breakages
+ * so we might as well take the fix together with their
+ * real change.
+ */
+ match = (tgtfixlen == fixlen && !memcmp(tgtfix, buf, fixlen));
+
+ if (tgtfix != tgtfixbuf)
+ free(tgtfix);
+ if (!match)
+ goto unmatch_exit;
+
+ orig += oldlen;
+ buf += fixlen;
+ target += tgtlen;
+ }
+
+ /*
+ * Yes, the preimage is based on an older version that still
+ * has whitespace breakages unfixed, and fixing them makes the
+ * hunk match. Update the context lines in the postimage.
+ */
+ update_pre_post_images(preimage, postimage,
+ fixed_buf, buf - fixed_buf, 0);
+ return 1;
+
+ unmatch_exit:
+ free(fixed_buf);
+ return 0;
+}
+
+static int find_pos(struct image *img,
+ struct image *preimage,
+ struct image *postimage,
+ int line,
+ unsigned ws_rule,
+ int match_beginning, int match_end)
+{
+ int i;
+ unsigned long backwards, forwards, try;
+ int backwards_lno, forwards_lno, try_lno;
+
+ if (preimage->nr > img->nr)
+ return -1;
+
+ /*
+ * If match_beginning or match_end is specified, there is no
+ * point starting from a wrong line that will never match and
+ * wander around and wait for a match at the specified end.
+ */
+ if (match_beginning)
+ line = 0;
+ else if (match_end)
+ line = img->nr - preimage->nr;
+
+ if (line > img->nr)
+ line = img->nr;
+
+ try = 0;
+ for (i = 0; i < line; i++)
+ try += img->line[i].len;
+
+ /*
+ * There's probably some smart way to do this, but I'll leave
+ * that to the smart and beautiful people. I'm simple and stupid.
+ */
+ backwards = try;
+ backwards_lno = line;
+ forwards = try;
+ forwards_lno = line;
+ try_lno = line;
+
+ for (i = 0; ; i++) {
+ if (match_fragment(img, preimage, postimage,
+ try, try_lno, ws_rule,
+ match_beginning, match_end))
+ return try_lno;
+
+ again:
+ if (backwards_lno == 0 && forwards_lno == img->nr)
+ break;
+
+ if (i & 1) {
+ if (backwards_lno == 0) {
+ i++;
+ goto again;
+ }
+ backwards_lno--;
+ backwards -= img->line[backwards_lno].len;
+ try = backwards;
+ try_lno = backwards_lno;
+ } else {
+ if (forwards_lno == img->nr) {
+ i++;
+ goto again;
+ }
+ forwards += img->line[forwards_lno].len;
+ forwards_lno++;
+ try = forwards;
+ try_lno = forwards_lno;
+ }
+
+ }
+ return -1;
+}
+
+static void remove_first_line(struct image *img)
+{
+ img->buf += img->line[0].len;
+ img->len -= img->line[0].len;
+ img->line++;
+ img->nr--;
+}
+
+static void remove_last_line(struct image *img)
+{
+ img->len -= img->line[--img->nr].len;
+}
+
+static void update_image(struct image *img,
+ int applied_pos,
+ struct image *preimage,
+ struct image *postimage)
+{
+ /*
+ * remove the copy of preimage at offset in img
+ * and replace it with postimage
+ */
+ int i, nr;
+ size_t remove_count, insert_count, applied_at = 0;
+ char *result;
+
+ for (i = 0; i < applied_pos; i++)
+ applied_at += img->line[i].len;
+
+ remove_count = 0;
+ for (i = 0; i < preimage->nr; i++)
+ remove_count += img->line[applied_pos + i].len;
+ insert_count = postimage->len;
+
+ /* Adjust the contents */
+ result = xmalloc(img->len + insert_count - remove_count + 1);
+ memcpy(result, img->buf, applied_at);
+ memcpy(result + applied_at, postimage->buf, postimage->len);
+ memcpy(result + applied_at + postimage->len,
+ img->buf + (applied_at + remove_count),
+ img->len - (applied_at + remove_count));
+ free(img->buf);
+ img->buf = result;
+ img->len += insert_count - remove_count;
+ result[img->len] = '\0';
+
+ /* Adjust the line table */
+ nr = img->nr + postimage->nr - preimage->nr;
+ if (preimage->nr < postimage->nr) {
+ /*
+ * NOTE: this knows that we never call remove_first_line()
+ * on anything other than pre/post image.
+ */
+ img->line = xrealloc(img->line, nr * sizeof(*img->line));
+ img->line_allocated = img->line;
+ }
+ if (preimage->nr != postimage->nr)
+ memmove(img->line + applied_pos + postimage->nr,
+ img->line + applied_pos + preimage->nr,
+ (img->nr - (applied_pos + preimage->nr)) *
+ sizeof(*img->line));
+ memcpy(img->line + applied_pos,
+ postimage->line,
+ postimage->nr * sizeof(*img->line));
+ img->nr = nr;
+}
+
+static int apply_one_fragment(struct image *img, struct fragment *frag,
+ int inaccurate_eof, unsigned ws_rule)
+{
+ int match_beginning, match_end;
+ const char *patch = frag->patch;
+ int size = frag->size;
+ char *old, *new, *oldlines, *newlines;
+ int new_blank_lines_at_end = 0;
+ unsigned long leading, trailing;
+ int pos, applied_pos;
+ struct image preimage;
+ struct image postimage;
+
+ memset(&preimage, 0, sizeof(preimage));
+ memset(&postimage, 0, sizeof(postimage));
+ oldlines = xmalloc(size);
+ newlines = xmalloc(size);
+
+ old = oldlines;
+ new = newlines;
+ while (size > 0) {
+ char first;
+ int len = linelen(patch, size);
+ int plen, added;
+ int added_blank_line = 0;
+ int is_blank_context = 0;
+
+ if (!len)
+ break;
+
+ /*
+ * "plen" is how much of the line we should use for
+ * the actual patch data. Normally we just remove the
+ * first character on the line, but if the line is
+ * followed by "\ No newline", then we also remove the
+ * last one (which is the newline, of course).
+ */
+ plen = len - 1;
+ if (len < size && patch[len] == '\\')
+ plen--;
+ first = *patch;
+ if (apply_in_reverse) {
+ if (first == '-')
+ first = '+';
+ else if (first == '+')
+ first = '-';
+ }
+
+ switch (first) {
+ case '\n':
+ /* Newer GNU diff, empty context line */
+ if (plen < 0)
+ /* ... followed by '\No newline'; nothing */
+ break;
+ *old++ = '\n';
+ *new++ = '\n';
+ add_line_info(&preimage, "\n", 1, LINE_COMMON);
+ add_line_info(&postimage, "\n", 1, LINE_COMMON);
+ is_blank_context = 1;
+ break;
+ case ' ':
+ if (plen && (ws_rule & WS_BLANK_AT_EOF) &&
+ ws_blank_line(patch + 1, plen, ws_rule))
+ is_blank_context = 1;
+ case '-':
+ memcpy(old, patch + 1, plen);
+ add_line_info(&preimage, old, plen,
+ (first == ' ' ? LINE_COMMON : 0));
+ old += plen;
+ if (first == '-')
+ break;
+ /* Fall-through for ' ' */
+ case '+':
+ /* --no-add does not add new lines */
+ if (first == '+' && no_add)
+ break;
+
+ if (first != '+' ||
+ !whitespace_error ||
+ ws_error_action != correct_ws_error) {
+ memcpy(new, patch + 1, plen);
+ added = plen;
+ }
+ else {
+ added = ws_fix_copy(new, patch + 1, plen, ws_rule, &applied_after_fixing_ws);
+ }
+ add_line_info(&postimage, new, added,
+ (first == '+' ? 0 : LINE_COMMON));
+ new += added;
+ if (first == '+' &&
+ (ws_rule & WS_BLANK_AT_EOF) &&
+ ws_blank_line(patch + 1, plen, ws_rule))
+ added_blank_line = 1;
+ break;
+ case '@': case '\\':
+ /* Ignore it, we already handled it */
+ break;
+ default:
+ if (apply_verbosely)
+ error("invalid start of line: '%c'", first);
+ return -1;
+ }
+ if (added_blank_line)
+ new_blank_lines_at_end++;
+ else if (is_blank_context)
+ ;
+ else
+ new_blank_lines_at_end = 0;
+ patch += len;
+ size -= len;
+ }
+ if (inaccurate_eof &&
+ old > oldlines && old[-1] == '\n' &&
+ new > newlines && new[-1] == '\n') {
+ old--;
+ new--;
+ }
+
+ leading = frag->leading;
+ trailing = frag->trailing;
+
+ /*
+ * A hunk to change lines at the beginning would begin with
+ * @@ -1,L +N,M @@
+ * but we need to be careful. -U0 that inserts before the second
+ * line also has this pattern.
+ *
+ * And a hunk to add to an empty file would begin with
+ * @@ -0,0 +N,M @@
+ *
+ * In other words, a hunk that is (frag->oldpos <= 1) with or
+ * without leading context must match at the beginning.
+ */
+ match_beginning = (!frag->oldpos ||
+ (frag->oldpos == 1 && !unidiff_zero));
+
+ /*
+ * A hunk without trailing lines must match at the end.
+ * However, we simply cannot tell if a hunk must match end
+ * from the lack of trailing lines if the patch was generated
+ * with unidiff without any context.
+ */
+ match_end = !unidiff_zero && !trailing;
+
+ pos = frag->newpos ? (frag->newpos - 1) : 0;
+ preimage.buf = oldlines;
+ preimage.len = old - oldlines;
+ postimage.buf = newlines;
+ postimage.len = new - newlines;
+ preimage.line = preimage.line_allocated;
+ postimage.line = postimage.line_allocated;
+
+ for (;;) {
+
+ applied_pos = find_pos(img, &preimage, &postimage, pos,
+ ws_rule, match_beginning, match_end);
+
+ if (applied_pos >= 0)
+ break;
+
+ /* Am I at my context limits? */
+ if ((leading <= p_context) && (trailing <= p_context))
+ break;
+ if (match_beginning || match_end) {
+ match_beginning = match_end = 0;
+ continue;
+ }
+
+ /*
+ * Reduce the number of context lines; reduce both
+ * leading and trailing if they are equal otherwise
+ * just reduce the larger context.
+ */
+ if (leading >= trailing) {
+ remove_first_line(&preimage);
+ remove_first_line(&postimage);
+ pos--;
+ leading--;
+ }
+ if (trailing > leading) {
+ remove_last_line(&preimage);
+ remove_last_line(&postimage);
+ trailing--;
+ }
+ }
+
+ if (applied_pos >= 0) {
+ if (new_blank_lines_at_end &&
+ preimage.nr + applied_pos == img->nr &&
+ (ws_rule & WS_BLANK_AT_EOF) &&
+ ws_error_action != nowarn_ws_error) {
+ record_ws_error(WS_BLANK_AT_EOF, "+", 1, frag->linenr);
+ if (ws_error_action == correct_ws_error) {
+ while (new_blank_lines_at_end--)
+ remove_last_line(&postimage);
+ }
+ /*
+ * We would want to prevent write_out_results()
+ * from taking place in apply_patch() that follows
+ * the callchain led us here, which is:
+ * apply_patch->check_patch_list->check_patch->
+ * apply_data->apply_fragments->apply_one_fragment
+ */
+ if (ws_error_action == die_on_ws_error)
+ apply = 0;
+ }
+
+ /*
+ * Warn if it was necessary to reduce the number
+ * of context lines.
+ */
+ if ((leading != frag->leading) ||
+ (trailing != frag->trailing))
+ fprintf(stderr, "Context reduced to (%ld/%ld)"
+ " to apply fragment at %d\n",
+ leading, trailing, applied_pos+1);
+ update_image(img, applied_pos, &preimage, &postimage);
+ } else {
+ if (apply_verbosely)
+ error("while searching for:\n%.*s",
+ (int)(old - oldlines), oldlines);
+ }
+
+ free(oldlines);
+ free(newlines);
+ free(preimage.line_allocated);
+ free(postimage.line_allocated);
+
+ return (applied_pos < 0);
+}
+
+static int apply_binary_fragment(struct image *img, struct patch *patch)
+{
+ struct fragment *fragment = patch->fragments;
+ unsigned long len;
+ void *dst;
+
+ /* Binary patch is irreversible without the optional second hunk */
+ if (apply_in_reverse) {
+ if (!fragment->next)
+ return error("cannot reverse-apply a binary patch "
+ "without the reverse hunk to '%s'",
+ patch->new_name
+ ? patch->new_name : patch->old_name);
+ fragment = fragment->next;
+ }
+ switch (fragment->binary_patch_method) {
+ case BINARY_DELTA_DEFLATED:
+ dst = patch_delta(img->buf, img->len, fragment->patch,
+ fragment->size, &len);
+ if (!dst)
+ return -1;
+ clear_image(img);
+ img->buf = dst;
+ img->len = len;
+ return 0;
+ case BINARY_LITERAL_DEFLATED:
+ clear_image(img);
+ img->len = fragment->size;
+ img->buf = xmalloc(img->len+1);
+ memcpy(img->buf, fragment->patch, img->len);
+ img->buf[img->len] = '\0';
+ return 0;
+ }
+ return -1;
+}
+
+static int apply_binary(struct image *img, struct patch *patch)
+{
+ const char *name = patch->old_name ? patch->old_name : patch->new_name;
+ unsigned char sha1[20];
+
+ /*
+ * For safety, we require patch index line to contain
+ * full 40-byte textual SHA1 for old and new, at least for now.
+ */
+ if (strlen(patch->old_sha1_prefix) != 40 ||
+ strlen(patch->new_sha1_prefix) != 40 ||
+ get_sha1_hex(patch->old_sha1_prefix, sha1) ||
+ get_sha1_hex(patch->new_sha1_prefix, sha1))
+ return error("cannot apply binary patch to '%s' "
+ "without full index line", name);
+
+ if (patch->old_name) {
+ /*
+ * See if the old one matches what the patch
+ * applies to.
+ */
+ hash_sha1_file(img->buf, img->len, blob_type, sha1);
+ if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
+ return error("the patch applies to '%s' (%s), "
+ "which does not match the "
+ "current contents.",
+ name, sha1_to_hex(sha1));
+ }
+ else {
+ /* Otherwise, the old one must be empty. */
+ if (img->len)
+ return error("the patch applies to an empty "
+ "'%s' but it is not empty", name);
+ }
+
+ get_sha1_hex(patch->new_sha1_prefix, sha1);
+ if (is_null_sha1(sha1)) {
+ clear_image(img);
+ return 0; /* deletion patch */
+ }
+
+ if (has_sha1_file(sha1)) {
+ /* We already have the postimage */
+ enum object_type type;
+ unsigned long size;
+ char *result;
+
+ result = read_sha1_file(sha1, &type, &size);
+ if (!result)
+ return error("the necessary postimage %s for "
+ "'%s' cannot be read",
+ patch->new_sha1_prefix, name);
+ clear_image(img);
+ img->buf = result;
+ img->len = size;
+ } else {
+ /*
+ * We have verified buf matches the preimage;
+ * apply the patch data to it, which is stored
+ * in the patch->fragments->{patch,size}.
+ */
+ if (apply_binary_fragment(img, patch))
+ return error("binary patch does not apply to '%s'",
+ name);
+
+ /* verify that the result matches */
+ hash_sha1_file(img->buf, img->len, blob_type, sha1);
+ if (strcmp(sha1_to_hex(sha1), patch->new_sha1_prefix))
+ return error("binary patch to '%s' creates incorrect result (expecting %s, got %s)",
+ name, patch->new_sha1_prefix, sha1_to_hex(sha1));
+ }
+
+ return 0;
+}
+
+static int apply_fragments(struct image *img, struct patch *patch)
+{
+ struct fragment *frag = patch->fragments;
+ const char *name = patch->old_name ? patch->old_name : patch->new_name;
+ unsigned ws_rule = patch->ws_rule;
+ unsigned inaccurate_eof = patch->inaccurate_eof;
+
+ if (patch->is_binary)
+ return apply_binary(img, patch);
+
+ while (frag) {
+ if (apply_one_fragment(img, frag, inaccurate_eof, ws_rule)) {
+ error("patch failed: %s:%ld", name, frag->oldpos);
+ if (!apply_with_reject)
+ return -1;
+ frag->rejected = 1;
+ }
+ frag = frag->next;
+ }
+ return 0;
+}
+
+static int read_file_or_gitlink(struct cache_entry *ce, struct strbuf *buf)
+{
+ if (!ce)
+ return 0;
+
+ if (S_ISGITLINK(ce->ce_mode)) {
+ strbuf_grow(buf, 100);
+ strbuf_addf(buf, "Subproject commit %s\n", sha1_to_hex(ce->sha1));
+ } else {
+ enum object_type type;
+ unsigned long sz;
+ char *result;
+
+ result = read_sha1_file(ce->sha1, &type, &sz);
+ if (!result)
+ return -1;
+ /* XXX read_sha1_file NUL-terminates */
+ strbuf_attach(buf, result, sz, sz + 1);
+ }
+ return 0;
+}
+
+static struct patch *in_fn_table(const char *name)
+{
+ struct string_list_item *item;
+
+ if (name == NULL)
+ return NULL;
+
+ item = string_list_lookup(name, &fn_table);
+ if (item != NULL)
+ return (struct patch *)item->util;
+
+ return NULL;
+}
+
+/*
+ * item->util in the filename table records the status of the path.
+ * Usually it points at a patch (whose result records the contents
+ * of it after applying it), but it could be PATH_WAS_DELETED for a
+ * path that a previously applied patch has already removed.
+ */
+ #define PATH_TO_BE_DELETED ((struct patch *) -2)
+#define PATH_WAS_DELETED ((struct patch *) -1)
+
+static int to_be_deleted(struct patch *patch)
+{
+ return patch == PATH_TO_BE_DELETED;
+}
+
+static int was_deleted(struct patch *patch)
+{
+ return patch == PATH_WAS_DELETED;
+}
+
+static void add_to_fn_table(struct patch *patch)
+{
+ struct string_list_item *item;
+
+ /*
+ * Always add new_name unless patch is a deletion
+ * This should cover the cases for normal diffs,
+ * file creations and copies
+ */
+ if (patch->new_name != NULL) {
+ item = string_list_insert(patch->new_name, &fn_table);
+ item->util = patch;
+ }
+
+ /*
+ * store a failure on rename/deletion cases because
+ * later chunks shouldn't patch old names
+ */
+ if ((patch->new_name == NULL) || (patch->is_rename)) {
+ item = string_list_insert(patch->old_name, &fn_table);
+ item->util = PATH_WAS_DELETED;
+ }
+}
+
+static void prepare_fn_table(struct patch *patch)
+{
+ /*
+ * store information about incoming file deletion
+ */
+ while (patch) {
+ if ((patch->new_name == NULL) || (patch->is_rename)) {
+ struct string_list_item *item;
+ item = string_list_insert(patch->old_name, &fn_table);
+ item->util = PATH_TO_BE_DELETED;
+ }
+ patch = patch->next;
+ }
+}
+
+static int apply_data(struct patch *patch, struct stat *st, struct cache_entry *ce)
+{
+ struct strbuf buf = STRBUF_INIT;
+ struct image image;
+ size_t len;
+ char *img;
+ struct patch *tpatch;
+
+ if (!(patch->is_copy || patch->is_rename) &&
+ (tpatch = in_fn_table(patch->old_name)) != NULL && !to_be_deleted(tpatch)) {
+ if (was_deleted(tpatch)) {
+ return error("patch %s has been renamed/deleted",
+ patch->old_name);
+ }
+ /* We have a patched copy in memory use that */
+ strbuf_add(&buf, tpatch->result, tpatch->resultsize);
+ } else if (cached) {
+ if (read_file_or_gitlink(ce, &buf))
+ return error("read of %s failed", patch->old_name);
+ } else if (patch->old_name) {
+ if (S_ISGITLINK(patch->old_mode)) {
+ if (ce) {
+ read_file_or_gitlink(ce, &buf);
+ } else {
+ /*
+ * There is no way to apply subproject
+ * patch without looking at the index.
+ */
+ patch->fragments = NULL;
+ }
+ } else {
+ if (read_old_data(st, patch->old_name, &buf))
+ return error("read of %s failed", patch->old_name);
+ }
+ }
+
+ img = strbuf_detach(&buf, &len);
+ prepare_image(&image, img, len, !patch->is_binary);
+
+ if (apply_fragments(&image, patch) < 0)
+ return -1; /* note with --reject this succeeds. */
+ patch->result = image.buf;
+ patch->resultsize = image.len;
+ add_to_fn_table(patch);
+ free(image.line_allocated);
+
+ if (0 < patch->is_delete && patch->resultsize)
+ return error("removal patch leaves file contents");
+
+ return 0;
+}
+
+static int check_to_create_blob(const char *new_name, int ok_if_exists)
+{
+ struct stat nst;
+ if (!lstat(new_name, &nst)) {
+ if (S_ISDIR(nst.st_mode) || ok_if_exists)
+ return 0;
+ /*
+ * A leading component of new_name might be a symlink
+ * that is going to be removed with this patch, but
+ * still pointing at somewhere that has the path.
+ * In such a case, path "new_name" does not exist as
+ * far as git is concerned.
+ */
+ if (has_symlink_leading_path(new_name, strlen(new_name)))
+ return 0;
+
+ return error("%s: already exists in working directory", new_name);
+ }
+ else if ((errno != ENOENT) && (errno != ENOTDIR))
+ return error("%s: %s", new_name, strerror(errno));
+ return 0;
+}
+
+static int verify_index_match(struct cache_entry *ce, struct stat *st)
+{
+ if (S_ISGITLINK(ce->ce_mode)) {
+ if (!S_ISDIR(st->st_mode))
+ return -1;
+ return 0;
+ }
+ return ce_match_stat(ce, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
+}
+
+static int check_preimage(struct patch *patch, struct cache_entry **ce, struct stat *st)
+{
+ const char *old_name = patch->old_name;
+ struct patch *tpatch = NULL;
+ int stat_ret = 0;
+ unsigned st_mode = 0;
+
+ /*
+ * Make sure that we do not have local modifications from the
+ * index when we are looking at the index. Also make sure
+ * we have the preimage file to be patched in the work tree,
+ * unless --cached, which tells git to apply only in the index.
+ */
+ if (!old_name)
+ return 0;
+
+ assert(patch->is_new <= 0);
+
+ if (!(patch->is_copy || patch->is_rename) &&
+ (tpatch = in_fn_table(old_name)) != NULL && !to_be_deleted(tpatch)) {
+ if (was_deleted(tpatch))
+ return error("%s: has been deleted/renamed", old_name);
+ st_mode = tpatch->new_mode;
+ } else if (!cached) {
+ stat_ret = lstat(old_name, st);
+ if (stat_ret && errno != ENOENT)
+ return error("%s: %s", old_name, strerror(errno));
+ }
+
+ if (to_be_deleted(tpatch))
+ tpatch = NULL;
+
+ if (check_index && !tpatch) {
+ int pos = cache_name_pos(old_name, strlen(old_name));
+ if (pos < 0) {
+ if (patch->is_new < 0)
+ goto is_new;
+ return error("%s: does not exist in index", old_name);
+ }
+ *ce = active_cache[pos];
+ if (stat_ret < 0) {
+ struct checkout costate;
+ /* checkout */
+ costate.base_dir = "";
+ costate.base_dir_len = 0;
+ costate.force = 0;
+ costate.quiet = 0;
+ costate.not_new = 0;
+ costate.refresh_cache = 1;
+ if (checkout_entry(*ce, &costate, NULL) ||
+ lstat(old_name, st))
+ return -1;
+ }
+ if (!cached && verify_index_match(*ce, st))
+ return error("%s: does not match index", old_name);
+ if (cached)
+ st_mode = (*ce)->ce_mode;
+ } else if (stat_ret < 0) {
+ if (patch->is_new < 0)
+ goto is_new;
+ return error("%s: %s", old_name, strerror(errno));
+ }
+
+ if (!cached && !tpatch)
+ st_mode = ce_mode_from_stat(*ce, st->st_mode);
+
+ if (patch->is_new < 0)
+ patch->is_new = 0;
+ if (!patch->old_mode)
+ patch->old_mode = st_mode;
+ if ((st_mode ^ patch->old_mode) & S_IFMT)
+ return error("%s: wrong type", old_name);
+ if (st_mode != patch->old_mode)
+ warning("%s has type %o, expected %o",
+ old_name, st_mode, patch->old_mode);
+ if (!patch->new_mode && !patch->is_delete)
+ patch->new_mode = st_mode;
+ return 0;
+
+ is_new:
+ patch->is_new = 1;
+ patch->is_delete = 0;
+ patch->old_name = NULL;
+ return 0;
+}
+
+static int check_patch(struct patch *patch)
+{
+ struct stat st;
+ const char *old_name = patch->old_name;
+ const char *new_name = patch->new_name;
+ const char *name = old_name ? old_name : new_name;
+ struct cache_entry *ce = NULL;
+ struct patch *tpatch;
+ int ok_if_exists;
+ int status;
+
+ patch->rejected = 1; /* we will drop this after we succeed */
+
+ status = check_preimage(patch, &ce, &st);
+ if (status)
+ return status;
+ old_name = patch->old_name;
+
+ if ((tpatch = in_fn_table(new_name)) &&
+ (was_deleted(tpatch) || to_be_deleted(tpatch)))
+ /*
+ * A type-change diff is always split into a patch to
+ * delete old, immediately followed by a patch to
+ * create new (see diff.c::run_diff()); in such a case
+ * it is Ok that the entry to be deleted by the
+ * previous patch is still in the working tree and in
+ * the index.
+ */
+ ok_if_exists = 1;
+ else
+ ok_if_exists = 0;
+
+ if (new_name &&
+ ((0 < patch->is_new) | (0 < patch->is_rename) | patch->is_copy)) {
+ if (check_index &&
+ cache_name_pos(new_name, strlen(new_name)) >= 0 &&
+ !ok_if_exists)
+ return error("%s: already exists in index", new_name);
+ if (!cached) {
+ int err = check_to_create_blob(new_name, ok_if_exists);
+ if (err)
+ return err;
+ }
+ if (!patch->new_mode) {
+ if (0 < patch->is_new)
+ patch->new_mode = S_IFREG | 0644;
+ else
+ patch->new_mode = patch->old_mode;
+ }
+ }
+
+ if (new_name && old_name) {
+ int same = !strcmp(old_name, new_name);
+ if (!patch->new_mode)
+ patch->new_mode = patch->old_mode;
+ if ((patch->old_mode ^ patch->new_mode) & S_IFMT)
+ return error("new mode (%o) of %s does not match old mode (%o)%s%s",
+ patch->new_mode, new_name, patch->old_mode,
+ same ? "" : " of ", same ? "" : old_name);
+ }
+
+ if (apply_data(patch, &st, ce) < 0)
+ return error("%s: patch does not apply", name);
+ patch->rejected = 0;
+ return 0;
+}
+
+static int check_patch_list(struct patch *patch)
+{
+ int err = 0;
+
+ prepare_fn_table(patch);
+ while (patch) {
+ if (apply_verbosely)
+ say_patch_name(stderr,
+ "Checking patch ", patch, "...\n");
+ err |= check_patch(patch);
+ patch = patch->next;
+ }
+ return err;
+}
+
+/* This function tries to read the sha1 from the current index */
+static int get_current_sha1(const char *path, unsigned char *sha1)
+{
+ int pos;
+
+ if (read_cache() < 0)
+ return -1;
+ pos = cache_name_pos(path, strlen(path));
+ if (pos < 0)
+ return -1;
+ hashcpy(sha1, active_cache[pos]->sha1);
+ return 0;
+}
+
+/* Build an index that contains the just the files needed for a 3way merge */
+static void build_fake_ancestor(struct patch *list, const char *filename)
+{
+ struct patch *patch;
+ struct index_state result = { NULL };
+ int fd;
+
+ /* Once we start supporting the reverse patch, it may be
+ * worth showing the new sha1 prefix, but until then...
+ */
+ for (patch = list; patch; patch = patch->next) {
+ const unsigned char *sha1_ptr;
+ unsigned char sha1[20];
+ struct cache_entry *ce;
+ const char *name;
+
+ name = patch->old_name ? patch->old_name : patch->new_name;
+ if (0 < patch->is_new)
+ continue;
+ else if (get_sha1(patch->old_sha1_prefix, sha1))
+ /* git diff has no index line for mode/type changes */
+ if (!patch->lines_added && !patch->lines_deleted) {
+ if (get_current_sha1(patch->new_name, sha1) ||
+ get_current_sha1(patch->old_name, sha1))
+ die("mode change for %s, which is not "
+ "in current HEAD", name);
+ sha1_ptr = sha1;
+ } else
+ die("sha1 information is lacking or useless "
+ "(%s).", name);
+ else
+ sha1_ptr = sha1;
+
+ ce = make_cache_entry(patch->old_mode, sha1_ptr, name, 0, 0);
+ if (!ce)
+ die("make_cache_entry failed for path '%s'", name);
+ if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD))
+ die ("Could not add %s to temporary index", name);
+ }
+
+ fd = open(filename, O_WRONLY | O_CREAT, 0666);
+ if (fd < 0 || write_index(&result, fd) || close(fd))
+ die ("Could not write temporary index to %s", filename);
+
+ discard_index(&result);
+}
+
+static void stat_patch_list(struct patch *patch)
+{
+ int files, adds, dels;
+
+ for (files = adds = dels = 0 ; patch ; patch = patch->next) {
+ files++;
+ adds += patch->lines_added;
+ dels += patch->lines_deleted;
+ show_stats(patch);
+ }
+
+ printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels);
+}
+
+static void numstat_patch_list(struct patch *patch)
+{
+ for ( ; patch; patch = patch->next) {
+ const char *name;
+ name = patch->new_name ? patch->new_name : patch->old_name;
+ if (patch->is_binary)
+ printf("-\t-\t");
+ else
+ printf("%d\t%d\t", patch->lines_added, patch->lines_deleted);
+ write_name_quoted(name, stdout, line_termination);
+ }
+}
+
+static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
+{
+ if (mode)
+ printf(" %s mode %06o %s\n", newdelete, mode, name);
+ else
+ printf(" %s %s\n", newdelete, name);
+}
+
+static void show_mode_change(struct patch *p, int show_name)
+{
+ if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
+ if (show_name)
+ printf(" mode change %06o => %06o %s\n",
+ p->old_mode, p->new_mode, p->new_name);
+ else
+ printf(" mode change %06o => %06o\n",
+ p->old_mode, p->new_mode);
+ }
+}
+
+static void show_rename_copy(struct patch *p)
+{
+ const char *renamecopy = p->is_rename ? "rename" : "copy";
+ const char *old, *new;
+
+ /* Find common prefix */
+ old = p->old_name;
+ new = p->new_name;
+ while (1) {
+ const char *slash_old, *slash_new;
+ slash_old = strchr(old, '/');
+ slash_new = strchr(new, '/');
+ if (!slash_old ||
+ !slash_new ||
+ slash_old - old != slash_new - new ||
+ memcmp(old, new, slash_new - new))
+ break;
+ old = slash_old + 1;
+ new = slash_new + 1;
+ }
+ /* p->old_name thru old is the common prefix, and old and new
+ * through the end of names are renames
+ */
+ if (old != p->old_name)
+ printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
+ (int)(old - p->old_name), p->old_name,
+ old, new, p->score);
+ else
+ printf(" %s %s => %s (%d%%)\n", renamecopy,
+ p->old_name, p->new_name, p->score);
+ show_mode_change(p, 0);
+}
+
+static void summary_patch_list(struct patch *patch)
+{
+ struct patch *p;
+
+ for (p = patch; p; p = p->next) {
+ if (p->is_new)
+ show_file_mode_name("create", p->new_mode, p->new_name);
+ else if (p->is_delete)
+ show_file_mode_name("delete", p->old_mode, p->old_name);
+ else {
+ if (p->is_rename || p->is_copy)
+ show_rename_copy(p);
+ else {
+ if (p->score) {
+ printf(" rewrite %s (%d%%)\n",
+ p->new_name, p->score);
+ show_mode_change(p, 0);
+ }
+ else
+ show_mode_change(p, 1);
+ }
+ }
+ }
+}
+
+static void patch_stats(struct patch *patch)
+{
+ int lines = patch->lines_added + patch->lines_deleted;
+
+ if (lines > max_change)
+ max_change = lines;
+ if (patch->old_name) {
+ int len = quote_c_style(patch->old_name, NULL, NULL, 0);
+ if (!len)
+ len = strlen(patch->old_name);
+ if (len > max_len)
+ max_len = len;
+ }
+ if (patch->new_name) {
+ int len = quote_c_style(patch->new_name, NULL, NULL, 0);
+ if (!len)
+ len = strlen(patch->new_name);
+ if (len > max_len)
+ max_len = len;
+ }
+}
+
+static void remove_file(struct patch *patch, int rmdir_empty)
+{
+ if (update_index) {
+ if (remove_file_from_cache(patch->old_name) < 0)
+ die("unable to remove %s from index", patch->old_name);
+ }
+ if (!cached) {
+ if (S_ISGITLINK(patch->old_mode)) {
+ if (rmdir(patch->old_name))
+ warning("unable to remove submodule %s",
+ patch->old_name);
+ } else if (!unlink_or_warn(patch->old_name) && rmdir_empty) {
+ remove_path(patch->old_name);
+ }
+ }
+}
+
+static void add_index_file(const char *path, unsigned mode, void *buf, unsigned long size)
+{
+ struct stat st;
+ struct cache_entry *ce;
+ int namelen = strlen(path);
+ unsigned ce_size = cache_entry_size(namelen);
+
+ if (!update_index)
+ return;
+
+ ce = xcalloc(1, ce_size);
+ memcpy(ce->name, path, namelen);
+ ce->ce_mode = create_ce_mode(mode);
+ ce->ce_flags = namelen;
+ if (S_ISGITLINK(mode)) {
+ const char *s = buf;
+
+ if (get_sha1_hex(s + strlen("Subproject commit "), ce->sha1))
+ die("corrupt patch for subproject %s", path);
+ } else {
+ if (!cached) {
+ if (lstat(path, &st) < 0)
+ die_errno("unable to stat newly created file '%s'",
+ path);
+ fill_stat_cache_info(ce, &st);
+ }
+ if (write_sha1_file(buf, size, blob_type, ce->sha1) < 0)
+ die("unable to create backing store for newly created file %s", path);
+ }
+ if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
+ die("unable to add cache entry for %s", path);
+}
+
+static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
+{
+ int fd;
+ struct strbuf nbuf = STRBUF_INIT;
+
+ if (S_ISGITLINK(mode)) {
+ struct stat st;
+ if (!lstat(path, &st) && S_ISDIR(st.st_mode))
+ return 0;
+ return mkdir(path, 0777);
+ }
+
+ if (has_symlinks && S_ISLNK(mode))
+ /* Although buf:size is counted string, it also is NUL
+ * terminated.
+ */
+ return symlink(buf, path);
+
+ fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666);
+ if (fd < 0)
+ return -1;
+
+ if (convert_to_working_tree(path, buf, size, &nbuf)) {
+ size = nbuf.len;
+ buf = nbuf.buf;
+ }
+ write_or_die(fd, buf, size);
+ strbuf_release(&nbuf);
+
+ if (close(fd) < 0)
+ die_errno("closing file '%s'", path);
+ return 0;
+}
+
+/*
+ * We optimistically assume that the directories exist,
+ * which is true 99% of the time anyway. If they don't,
+ * we create them and try again.
+ */
+static void create_one_file(char *path, unsigned mode, const char *buf, unsigned long size)
+{
+ if (cached)
+ return;
+ if (!try_create_file(path, mode, buf, size))
+ return;
+
+ if (errno == ENOENT) {
+ if (safe_create_leading_directories(path))
+ return;
+ if (!try_create_file(path, mode, buf, size))
+ return;
+ }
+
+ if (errno == EEXIST || errno == EACCES) {
+ /* We may be trying to create a file where a directory
+ * used to be.
+ */
+ struct stat st;
+ if (!lstat(path, &st) && (!S_ISDIR(st.st_mode) || !rmdir(path)))
+ errno = EEXIST;
+ }
+
+ if (errno == EEXIST) {
+ unsigned int nr = getpid();
+
+ for (;;) {
+ char newpath[PATH_MAX];
+ mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr);
+ if (!try_create_file(newpath, mode, buf, size)) {
+ if (!rename(newpath, path))
+ return;
+ unlink_or_warn(newpath);
+ break;
+ }
+ if (errno != EEXIST)
+ break;
+ ++nr;
+ }
+ }
+ die_errno("unable to write file '%s' mode %o", path, mode);
+}
+
+static void create_file(struct patch *patch)
+{
+ char *path = patch->new_name;
+ unsigned mode = patch->new_mode;
+ unsigned long size = patch->resultsize;
+ char *buf = patch->result;
+
+ if (!mode)
+ mode = S_IFREG | 0644;
+ create_one_file(path, mode, buf, size);
+ add_index_file(path, mode, buf, size);
+}
+
+/* phase zero is to remove, phase one is to create */
+static void write_out_one_result(struct patch *patch, int phase)
+{
+ if (patch->is_delete > 0) {
+ if (phase == 0)
+ remove_file(patch, 1);
+ return;
+ }
+ if (patch->is_new > 0 || patch->is_copy) {
+ if (phase == 1)
+ create_file(patch);
+ return;
+ }
+ /*
+ * Rename or modification boils down to the same
+ * thing: remove the old, write the new
+ */
+ if (phase == 0)
+ remove_file(patch, patch->is_rename);
+ if (phase == 1)
+ create_file(patch);
+}
+
+static int write_out_one_reject(struct patch *patch)
+{
+ FILE *rej;
+ char namebuf[PATH_MAX];
+ struct fragment *frag;
+ int cnt = 0;
+
+ for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) {
+ if (!frag->rejected)
+ continue;
+ cnt++;
+ }
+
+ if (!cnt) {
+ if (apply_verbosely)
+ say_patch_name(stderr,
+ "Applied patch ", patch, " cleanly.\n");
+ return 0;
+ }
+
+ /* This should not happen, because a removal patch that leaves
+ * contents are marked "rejected" at the patch level.
+ */
+ if (!patch->new_name)
+ die("internal error");
+
+ /* Say this even without --verbose */
+ say_patch_name(stderr, "Applying patch ", patch, " with");
+ fprintf(stderr, " %d rejects...\n", cnt);
+
+ cnt = strlen(patch->new_name);
+ if (ARRAY_SIZE(namebuf) <= cnt + 5) {
+ cnt = ARRAY_SIZE(namebuf) - 5;
+ warning("truncating .rej filename to %.*s.rej",
+ cnt - 1, patch->new_name);
+ }
+ memcpy(namebuf, patch->new_name, cnt);
+ memcpy(namebuf + cnt, ".rej", 5);
+
+ rej = fopen(namebuf, "w");
+ if (!rej)
+ return error("cannot open %s: %s", namebuf, strerror(errno));
+
+ /* Normal git tools never deal with .rej, so do not pretend
+ * this is a git patch by saying --git nor give extended
+ * headers. While at it, maybe please "kompare" that wants
+ * the trailing TAB and some garbage at the end of line ;-).
+ */
+ fprintf(rej, "diff a/%s b/%s\t(rejected hunks)\n",
+ patch->new_name, patch->new_name);
+ for (cnt = 1, frag = patch->fragments;
+ frag;
+ cnt++, frag = frag->next) {
+ if (!frag->rejected) {
+ fprintf(stderr, "Hunk #%d applied cleanly.\n", cnt);
+ continue;
+ }
+ fprintf(stderr, "Rejected hunk #%d.\n", cnt);
+ fprintf(rej, "%.*s", frag->size, frag->patch);
+ if (frag->patch[frag->size-1] != '\n')
+ fputc('\n', rej);
+ }
+ fclose(rej);
+ return -1;
+}
+
+static int write_out_results(struct patch *list, int skipped_patch)
+{
+ int phase;
+ int errs = 0;
+ struct patch *l;
+
+ if (!list && !skipped_patch)
+ return error("No changes");
+
+ for (phase = 0; phase < 2; phase++) {
+ l = list;
+ while (l) {
+ if (l->rejected)
+ errs = 1;
+ else {
+ write_out_one_result(l, phase);
+ if (phase == 1 && write_out_one_reject(l))
+ errs = 1;
+ }
+ l = l->next;
+ }
+ }
+ return errs;
+}
+
+static struct lock_file lock_file;
+
+static struct string_list limit_by_name;
+static int has_include;
+static void add_name_limit(const char *name, int exclude)
+{
+ struct string_list_item *it;
+
+ it = string_list_append(name, &limit_by_name);
+ it->util = exclude ? NULL : (void *) 1;
+}
+
+static int use_patch(struct patch *p)
+{
+ const char *pathname = p->new_name ? p->new_name : p->old_name;
+ int i;
+
+ /* Paths outside are not touched regardless of "--include" */
+ if (0 < prefix_length) {
+ int pathlen = strlen(pathname);
+ if (pathlen <= prefix_length ||
+ memcmp(prefix, pathname, prefix_length))
+ return 0;
+ }
+
+ /* See if it matches any of exclude/include rule */
+ for (i = 0; i < limit_by_name.nr; i++) {
+ struct string_list_item *it = &limit_by_name.items[i];
+ if (!fnmatch(it->string, pathname, 0))
+ return (it->util != NULL);
+ }
+
+ /*
+ * If we had any include, a path that does not match any rule is
+ * not used. Otherwise, we saw bunch of exclude rules (or none)
+ * and such a path is used.
+ */
+ return !has_include;
+}
+
+
+static void prefix_one(char **name)
+{
+ char *old_name = *name;
+ if (!old_name)
+ return;
+ *name = xstrdup(prefix_filename(prefix, prefix_length, *name));
+ free(old_name);
+}
+
+static void prefix_patches(struct patch *p)
+{
+ if (!prefix || p->is_toplevel_relative)
+ return;
+ for ( ; p; p = p->next) {
+ if (p->new_name == p->old_name) {
+ char *prefixed = p->new_name;
+ prefix_one(&prefixed);
+ p->new_name = p->old_name = prefixed;
+ }
+ else {
+ prefix_one(&p->new_name);
+ prefix_one(&p->old_name);
+ }
+ }
+}
+
+#define INACCURATE_EOF (1<<0)
+#define RECOUNT (1<<1)
+
+static int apply_patch(int fd, const char *filename, int options)
+{
+ size_t offset;
+ struct strbuf buf = STRBUF_INIT;
+ struct patch *list = NULL, **listp = &list;
+ int skipped_patch = 0;
+
+ /* FIXME - memory leak when using multiple patch files as inputs */
+ memset(&fn_table, 0, sizeof(struct string_list));
+ patch_input_file = filename;
+ read_patch_file(&buf, fd);
+ offset = 0;
+ while (offset < buf.len) {
+ struct patch *patch;
+ int nr;
+
+ patch = xcalloc(1, sizeof(*patch));
+ patch->inaccurate_eof = !!(options & INACCURATE_EOF);
+ patch->recount = !!(options & RECOUNT);
+ nr = parse_chunk(buf.buf + offset, buf.len - offset, patch);
+ if (nr < 0)
+ break;
+ if (apply_in_reverse)
+ reverse_patches(patch);
+ if (prefix)
+ prefix_patches(patch);
+ if (use_patch(patch)) {
+ patch_stats(patch);
+ *listp = patch;
+ listp = &patch->next;
+ }
+ else {
+ /* perhaps free it a bit better? */
+ free(patch);
+ skipped_patch++;
+ }
+ offset += nr;
+ }
+
+ if (whitespace_error && (ws_error_action == die_on_ws_error))
+ apply = 0;
+
+ update_index = check_index && apply;
+ if (update_index && newfd < 0)
+ newfd = hold_locked_index(&lock_file, 1);
+
+ if (check_index) {
+ if (read_cache() < 0)
+ die("unable to read index file");
+ }
+
+ if ((check || apply) &&
+ check_patch_list(list) < 0 &&
+ !apply_with_reject)
+ exit(1);
+
+ if (apply && write_out_results(list, skipped_patch))
+ exit(1);
+
+ if (fake_ancestor)
+ build_fake_ancestor(list, fake_ancestor);
+
+ if (diffstat)
+ stat_patch_list(list);
+
+ if (numstat)
+ numstat_patch_list(list);
+
+ if (summary)
+ summary_patch_list(list);
+
+ strbuf_release(&buf);
+ return 0;
+}
+
+static int git_apply_config(const char *var, const char *value, void *cb)
+{
+ if (!strcmp(var, "apply.whitespace"))
+ return git_config_string(&apply_default_whitespace, var, value);
+ else if (!strcmp(var, "apply.ignorewhitespace"))
+ return git_config_string(&apply_default_ignorewhitespace, var, value);
+ return git_default_config(var, value, cb);
+}
+
+static int option_parse_exclude(const struct option *opt,
+ const char *arg, int unset)
+{
+ add_name_limit(arg, 1);
+ return 0;
+}
+
+static int option_parse_include(const struct option *opt,
+ const char *arg, int unset)
+{
+ add_name_limit(arg, 0);
+ has_include = 1;
+ return 0;
+}
+
+static int option_parse_p(const struct option *opt,
+ const char *arg, int unset)
+{
+ p_value = atoi(arg);
+ p_value_known = 1;
+ return 0;
+}
+
+static int option_parse_z(const struct option *opt,
+ const char *arg, int unset)
+{
+ if (unset)
+ line_termination = '\n';
+ else
+ line_termination = 0;
+ return 0;
+}
+
+static int option_parse_space_change(const struct option *opt,
+ const char *arg, int unset)
+{
+ if (unset)
+ ws_ignore_action = ignore_ws_none;
+ else
+ ws_ignore_action = ignore_ws_change;
+ return 0;
+}
+
+static int option_parse_whitespace(const struct option *opt,
+ const char *arg, int unset)
+{
+ const char **whitespace_option = opt->value;
+
+ *whitespace_option = arg;
+ parse_whitespace_option(arg);
+ return 0;
+}
+
+static int option_parse_directory(const struct option *opt,
+ const char *arg, int unset)
+{
+ root_len = strlen(arg);
+ if (root_len && arg[root_len - 1] != '/') {
+ char *new_root;
+ root = new_root = xmalloc(root_len + 2);
+ strcpy(new_root, arg);
+ strcpy(new_root + root_len++, "/");
+ } else
+ root = arg;
+ return 0;
+}
+
+int cmd_apply(int argc, const char **argv, const char *unused_prefix)
+{
+ int i;
+ int errs = 0;
+ int is_not_gitdir;
+ int binary;
+ int force_apply = 0;
+
+ const char *whitespace_option = NULL;
+
+ struct option builtin_apply_options[] = {
+ { OPTION_CALLBACK, 0, "exclude", NULL, "path",
+ "don't apply changes matching the given path",
+ 0, option_parse_exclude },
+ { OPTION_CALLBACK, 0, "include", NULL, "path",
+ "apply changes matching the given path",
+ 0, option_parse_include },
+ { OPTION_CALLBACK, 'p', NULL, NULL, "num",
+ "remove <num> leading slashes from traditional diff paths",
+ 0, option_parse_p },
+ OPT_BOOLEAN(0, "no-add", &no_add,
+ "ignore additions made by the patch"),
+ OPT_BOOLEAN(0, "stat", &diffstat,
+ "instead of applying the patch, output diffstat for the input"),
+ { OPTION_BOOLEAN, 0, "allow-binary-replacement", &binary,
+ NULL, "old option, now no-op",
+ PARSE_OPT_HIDDEN | PARSE_OPT_NOARG },
+ { OPTION_BOOLEAN, 0, "binary", &binary,
+ NULL, "old option, now no-op",
+ PARSE_OPT_HIDDEN | PARSE_OPT_NOARG },
+ OPT_BOOLEAN(0, "numstat", &numstat,
+ "shows number of added and deleted lines in decimal notation"),
+ OPT_BOOLEAN(0, "summary", &summary,
+ "instead of applying the patch, output a summary for the input"),
+ OPT_BOOLEAN(0, "check", &check,
+ "instead of applying the patch, see if the patch is applicable"),
+ OPT_BOOLEAN(0, "index", &check_index,
+ "make sure the patch is applicable to the current index"),
+ OPT_BOOLEAN(0, "cached", &cached,
+ "apply a patch without touching the working tree"),
+ OPT_BOOLEAN(0, "apply", &force_apply,
+ "also apply the patch (use with --stat/--summary/--check)"),
+ OPT_FILENAME(0, "build-fake-ancestor", &fake_ancestor,
+ "build a temporary index based on embedded index information"),
+ { OPTION_CALLBACK, 'z', NULL, NULL, NULL,
+ "paths are separated with NUL character",
+ PARSE_OPT_NOARG, option_parse_z },
+ OPT_INTEGER('C', NULL, &p_context,
+ "ensure at least <n> lines of context match"),
+ { OPTION_CALLBACK, 0, "whitespace", &whitespace_option, "action",
+ "detect new or modified lines that have whitespace errors",
+ 0, option_parse_whitespace },
+ { OPTION_CALLBACK, 0, "ignore-space-change", NULL, NULL,
+ "ignore changes in whitespace when finding context",
+ PARSE_OPT_NOARG, option_parse_space_change },
+ { OPTION_CALLBACK, 0, "ignore-whitespace", NULL, NULL,
+ "ignore changes in whitespace when finding context",
+ PARSE_OPT_NOARG, option_parse_space_change },
+ OPT_BOOLEAN('R', "reverse", &apply_in_reverse,
+ "apply the patch in reverse"),
+ OPT_BOOLEAN(0, "unidiff-zero", &unidiff_zero,
+ "don't expect at least one line of context"),
+ OPT_BOOLEAN(0, "reject", &apply_with_reject,
+ "leave the rejected hunks in corresponding *.rej files"),
+ OPT__VERBOSE(&apply_verbosely),
+ OPT_BIT(0, "inaccurate-eof", &options,
+ "tolerate incorrectly detected missing new-line at the end of file",
+ INACCURATE_EOF),
+ OPT_BIT(0, "recount", &options,
+ "do not trust the line counts in the hunk headers",
+ RECOUNT),
+ { OPTION_CALLBACK, 0, "directory", NULL, "root",
+ "prepend <root> to all filenames",
+ 0, option_parse_directory },
+ OPT_END()
+ };
+
+ prefix = setup_git_directory_gently(&is_not_gitdir);
+ prefix_length = prefix ? strlen(prefix) : 0;
+ git_config(git_apply_config, NULL);
+ if (apply_default_whitespace)
+ parse_whitespace_option(apply_default_whitespace);
+ if (apply_default_ignorewhitespace)
+ parse_ignorewhitespace_option(apply_default_ignorewhitespace);
+
+ argc = parse_options(argc, argv, prefix, builtin_apply_options,
+ apply_usage, 0);
+
+ if (apply_with_reject)
+ apply = apply_verbosely = 1;
+ if (!force_apply && (diffstat || numstat || summary || check || fake_ancestor))
+ apply = 0;
+ if (check_index && is_not_gitdir)
+ die("--index outside a repository");
+ if (cached) {
+ if (is_not_gitdir)
+ die("--cached outside a repository");
+ check_index = 1;
+ }
+ for (i = 0; i < argc; i++) {
+ const char *arg = argv[i];
+ int fd;
+
+ if (!strcmp(arg, "-")) {
+ errs |= apply_patch(0, "<stdin>", options);
+ read_stdin = 0;
+ continue;
+ } else if (0 < prefix_length)
+ arg = prefix_filename(prefix, prefix_length, arg);
+
+ fd = open(arg, O_RDONLY);
+ if (fd < 0)
+ die_errno("can't open patch '%s'", arg);
+ read_stdin = 0;
+ set_default_whitespace_mode(whitespace_option);
+ errs |= apply_patch(fd, arg, options);
+ close(fd);
+ }
+ set_default_whitespace_mode(whitespace_option);
+ if (read_stdin)
+ errs |= apply_patch(0, "<stdin>", options);
+ if (whitespace_error) {
+ if (squelch_whitespace_errors &&
+ squelch_whitespace_errors < whitespace_error) {
+ int squelched =
+ whitespace_error - squelch_whitespace_errors;
+ warning("squelched %d "
+ "whitespace error%s",
+ squelched,
+ squelched == 1 ? "" : "s");
+ }
+ if (ws_error_action == die_on_ws_error)
+ die("%d line%s add%s whitespace errors.",
+ whitespace_error,
+ whitespace_error == 1 ? "" : "s",
+ whitespace_error == 1 ? "s" : "");
+ if (applied_after_fixing_ws && apply)
+ warning("%d line%s applied after"
+ " fixing whitespace errors.",
+ applied_after_fixing_ws,
+ applied_after_fixing_ws == 1 ? "" : "s");
+ else if (whitespace_error)
+ warning("%d line%s add%s whitespace errors.",
+ whitespace_error,
+ whitespace_error == 1 ? "" : "s",
+ whitespace_error == 1 ? "s" : "");
+ }
+
+ if (update_index) {
+ if (write_cache(newfd, active_cache, active_nr) ||
+ commit_locked_index(&lock_file))
+ die("Unable to write new index file");
+ }
+
+ return !!errs;
+}