diff options
Diffstat (limited to 'diff.c')
| -rw-r--r-- | diff.c | 3216 |
1 files changed, 3216 insertions, 0 deletions
@@ -0,0 +1,3216 @@ +/* + * Copyright (C) 2005 Junio C Hamano + */ +#include "cache.h" +#include "quote.h" +#include "diff.h" +#include "diffcore.h" +#include "delta.h" +#include "xdiff-interface.h" +#include "color.h" +#include "attr.h" +#include "run-command.h" +#include "utf8.h" + +#ifdef NO_FAST_WORKING_DIRECTORY +#define FAST_WORKING_DIRECTORY 0 +#else +#define FAST_WORKING_DIRECTORY 1 +#endif + +static int diff_detect_rename_default; +static int diff_rename_limit_default = 100; +static int diff_use_color_default; +static const char *external_diff_cmd_cfg; +int diff_auto_refresh_index = 1; + +static char diff_colors[][COLOR_MAXLEN] = { + "\033[m", /* reset */ + "", /* PLAIN (normal) */ + "\033[1m", /* METAINFO (bold) */ + "\033[36m", /* FRAGINFO (cyan) */ + "\033[31m", /* OLD (red) */ + "\033[32m", /* NEW (green) */ + "\033[33m", /* COMMIT (yellow) */ + "\033[41m", /* WHITESPACE (red background) */ +}; + +static int parse_diff_color_slot(const char *var, int ofs) +{ + if (!strcasecmp(var+ofs, "plain")) + return DIFF_PLAIN; + if (!strcasecmp(var+ofs, "meta")) + return DIFF_METAINFO; + if (!strcasecmp(var+ofs, "frag")) + return DIFF_FRAGINFO; + if (!strcasecmp(var+ofs, "old")) + return DIFF_FILE_OLD; + if (!strcasecmp(var+ofs, "new")) + return DIFF_FILE_NEW; + if (!strcasecmp(var+ofs, "commit")) + return DIFF_COMMIT; + if (!strcasecmp(var+ofs, "whitespace")) + return DIFF_WHITESPACE; + die("bad config variable '%s'", var); +} + +static struct ll_diff_driver { + const char *name; + struct ll_diff_driver *next; + const char *cmd; +} *user_diff, **user_diff_tail; + +/* + * Currently there is only "diff.<drivername>.command" variable; + * because there are "diff.color.<slot>" variables, we are parsing + * this in a bit convoluted way to allow low level diff driver + * called "color". + */ +static int parse_lldiff_command(const char *var, const char *ep, const char *value) +{ + const char *name; + int namelen; + struct ll_diff_driver *drv; + + name = var + 5; + namelen = ep - name; + for (drv = user_diff; drv; drv = drv->next) + if (!strncmp(drv->name, name, namelen) && !drv->name[namelen]) + break; + if (!drv) { + drv = xcalloc(1, sizeof(struct ll_diff_driver)); + drv->name = xmemdupz(name, namelen); + if (!user_diff_tail) + user_diff_tail = &user_diff; + *user_diff_tail = drv; + user_diff_tail = &(drv->next); + } + + return git_config_string(&(drv->cmd), var, value); +} + +/* + * 'diff.<what>.funcname' attribute can be specified in the configuration + * to define a customized regexp to find the beginning of a function to + * be used for hunk header lines of "diff -p" style output. + */ +static struct funcname_pattern { + char *name; + char *pattern; + struct funcname_pattern *next; +} *funcname_pattern_list; + +static int parse_funcname_pattern(const char *var, const char *ep, const char *value) +{ + const char *name; + int namelen; + struct funcname_pattern *pp; + + name = var + 5; /* "diff." */ + namelen = ep - name; + + for (pp = funcname_pattern_list; pp; pp = pp->next) + if (!strncmp(pp->name, name, namelen) && !pp->name[namelen]) + break; + if (!pp) { + pp = xcalloc(1, sizeof(*pp)); + pp->name = xmemdupz(name, namelen); + pp->next = funcname_pattern_list; + funcname_pattern_list = pp; + } + if (pp->pattern) + free(pp->pattern); + pp->pattern = xstrdup(value); + return 0; +} + +/* + * These are to give UI layer defaults. + * The core-level commands such as git-diff-files should + * never be affected by the setting of diff.renames + * the user happens to have in the configuration file. + */ +int git_diff_ui_config(const char *var, const char *value) +{ + if (!strcmp(var, "diff.renamelimit")) { + diff_rename_limit_default = git_config_int(var, value); + return 0; + } + if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) { + diff_use_color_default = git_config_colorbool(var, value, -1); + return 0; + } + if (!strcmp(var, "diff.renames")) { + if (!value) + diff_detect_rename_default = DIFF_DETECT_RENAME; + else if (!strcasecmp(value, "copies") || + !strcasecmp(value, "copy")) + diff_detect_rename_default = DIFF_DETECT_COPY; + else if (git_config_bool(var,value)) + diff_detect_rename_default = DIFF_DETECT_RENAME; + return 0; + } + if (!strcmp(var, "diff.autorefreshindex")) { + diff_auto_refresh_index = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.external")) { + if (!value) + return config_error_nonbool(var); + external_diff_cmd_cfg = xstrdup(value); + return 0; + } + if (!prefixcmp(var, "diff.")) { + const char *ep = strrchr(var, '.'); + + if (ep != var + 4 && !strcmp(ep, ".command")) + return parse_lldiff_command(var, ep, value); + } + + return git_diff_basic_config(var, value); +} + +int git_diff_basic_config(const char *var, const char *value) +{ + if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) { + int slot = parse_diff_color_slot(var, 11); + if (!value) + return config_error_nonbool(var); + color_parse(value, var, diff_colors[slot]); + return 0; + } + + if (!prefixcmp(var, "diff.")) { + const char *ep = strrchr(var, '.'); + if (ep != var + 4) { + if (!strcmp(ep, ".funcname")) { + if (!value) + return config_error_nonbool(var); + return parse_funcname_pattern(var, ep, value); + } + } + } + + return git_default_config(var, value); +} + +static char *quote_two(const char *one, const char *two) +{ + int need_one = quote_c_style(one, NULL, NULL, 1); + int need_two = quote_c_style(two, NULL, NULL, 1); + struct strbuf res; + + strbuf_init(&res, 0); + if (need_one + need_two) { + strbuf_addch(&res, '"'); + quote_c_style(one, &res, NULL, 1); + quote_c_style(two, &res, NULL, 1); + strbuf_addch(&res, '"'); + } else { + strbuf_addstr(&res, one); + strbuf_addstr(&res, two); + } + return strbuf_detach(&res, NULL); +} + +static const char *external_diff(void) +{ + static const char *external_diff_cmd = NULL; + static int done_preparing = 0; + + if (done_preparing) + return external_diff_cmd; + external_diff_cmd = getenv("GIT_EXTERNAL_DIFF"); + if (!external_diff_cmd) + external_diff_cmd = external_diff_cmd_cfg; + done_preparing = 1; + return external_diff_cmd; +} + +static struct diff_tempfile { + const char *name; /* filename external diff should read from */ + char hex[41]; + char mode[10]; + char tmp_path[PATH_MAX]; +} diff_temp[2]; + +static int count_lines(const char *data, int size) +{ + int count, ch, completely_empty = 1, nl_just_seen = 0; + count = 0; + while (0 < size--) { + ch = *data++; + if (ch == '\n') { + count++; + nl_just_seen = 1; + completely_empty = 0; + } + else { + nl_just_seen = 0; + completely_empty = 0; + } + } + if (completely_empty) + return 0; + if (!nl_just_seen) + count++; /* no trailing newline */ + return count; +} + +static void print_line_count(int count) +{ + switch (count) { + case 0: + printf("0,0"); + break; + case 1: + printf("1"); + break; + default: + printf("1,%d", count); + break; + } +} + +static void copy_file_with_prefix(int prefix, const char *data, int size, + const char *set, const char *reset) +{ + int ch, nl_just_seen = 1; + while (0 < size--) { + ch = *data++; + if (nl_just_seen) { + fputs(set, stdout); + putchar(prefix); + } + if (ch == '\n') { + nl_just_seen = 1; + fputs(reset, stdout); + } else + nl_just_seen = 0; + putchar(ch); + } + if (!nl_just_seen) + printf("%s\n\\ No newline at end of file\n", reset); +} + +static void emit_rewrite_diff(const char *name_a, + const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + struct diff_options *o) +{ + int lc_a, lc_b; + int color_diff = DIFF_OPT_TST(o, COLOR_DIFF); + const char *name_a_tab, *name_b_tab; + const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO); + const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO); + const char *old = diff_get_color(color_diff, DIFF_FILE_OLD); + const char *new = diff_get_color(color_diff, DIFF_FILE_NEW); + const char *reset = diff_get_color(color_diff, DIFF_RESET); + static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT; + + name_a += (*name_a == '/'); + name_b += (*name_b == '/'); + name_a_tab = strchr(name_a, ' ') ? "\t" : ""; + name_b_tab = strchr(name_b, ' ') ? "\t" : ""; + + strbuf_reset(&a_name); + strbuf_reset(&b_name); + quote_two_c_style(&a_name, o->a_prefix, name_a, 0); + quote_two_c_style(&b_name, o->b_prefix, name_b, 0); + + diff_populate_filespec(one, 0); + diff_populate_filespec(two, 0); + lc_a = count_lines(one->data, one->size); + lc_b = count_lines(two->data, two->size); + printf("%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -", + metainfo, a_name.buf, name_a_tab, reset, + metainfo, b_name.buf, name_b_tab, reset, fraginfo); + print_line_count(lc_a); + printf(" +"); + print_line_count(lc_b); + printf(" @@%s\n", reset); + if (lc_a) + copy_file_with_prefix('-', one->data, one->size, old, reset); + if (lc_b) + copy_file_with_prefix('+', two->data, two->size, new, reset); +} + +static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) { + mf->ptr = (char *)""; /* does not matter */ + mf->size = 0; + return 0; + } + else if (diff_populate_filespec(one, 0)) + return -1; + mf->ptr = one->data; + mf->size = one->size; + return 0; +} + +struct diff_words_buffer { + mmfile_t text; + long alloc; + long current; /* output pointer */ + int suppressed_newline; +}; + +static void diff_words_append(char *line, unsigned long len, + struct diff_words_buffer *buffer) +{ + if (buffer->text.size + len > buffer->alloc) { + buffer->alloc = (buffer->text.size + len) * 3 / 2; + buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc); + } + line++; + len--; + memcpy(buffer->text.ptr + buffer->text.size, line, len); + buffer->text.size += len; +} + +struct diff_words_data { + struct xdiff_emit_state xm; + struct diff_words_buffer minus, plus; +}; + +static void print_word(struct diff_words_buffer *buffer, int len, int color, + int suppress_newline) +{ + const char *ptr; + int eol = 0; + + if (len == 0) + return; + + ptr = buffer->text.ptr + buffer->current; + buffer->current += len; + + if (ptr[len - 1] == '\n') { + eol = 1; + len--; + } + + fputs(diff_get_color(1, color), stdout); + fwrite(ptr, len, 1, stdout); + fputs(diff_get_color(1, DIFF_RESET), stdout); + + if (eol) { + if (suppress_newline) + buffer->suppressed_newline = 1; + else + putchar('\n'); + } +} + +static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len) +{ + struct diff_words_data *diff_words = priv; + + if (diff_words->minus.suppressed_newline) { + if (line[0] != '+') + putchar('\n'); + diff_words->minus.suppressed_newline = 0; + } + + len--; + switch (line[0]) { + case '-': + print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1); + break; + case '+': + print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0); + break; + case ' ': + print_word(&diff_words->plus, len, DIFF_PLAIN, 0); + diff_words->minus.current += len; + break; + } +} + +/* this executes the word diff on the accumulated buffers */ +static void diff_words_show(struct diff_words_data *diff_words) +{ + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + mmfile_t minus, plus; + int i; + + memset(&xecfg, 0, sizeof(xecfg)); + minus.size = diff_words->minus.text.size; + minus.ptr = xmalloc(minus.size); + memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size); + for (i = 0; i < minus.size; i++) + if (isspace(minus.ptr[i])) + minus.ptr[i] = '\n'; + diff_words->minus.current = 0; + + plus.size = diff_words->plus.text.size; + plus.ptr = xmalloc(plus.size); + memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size); + for (i = 0; i < plus.size; i++) + if (isspace(plus.ptr[i])) + plus.ptr[i] = '\n'; + diff_words->plus.current = 0; + + xpp.flags = XDF_NEED_MINIMAL; + xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc; + ecb.outf = xdiff_outf; + ecb.priv = diff_words; + diff_words->xm.consume = fn_out_diff_words_aux; + xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb); + + free(minus.ptr); + free(plus.ptr); + diff_words->minus.text.size = diff_words->plus.text.size = 0; + + if (diff_words->minus.suppressed_newline) { + putchar('\n'); + diff_words->minus.suppressed_newline = 0; + } +} + +typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len); + +struct emit_callback { + struct xdiff_emit_state xm; + int nparents, color_diff; + unsigned ws_rule; + sane_truncate_fn truncate; + const char **label_path; + struct diff_words_data *diff_words; + int *found_changesp; +}; + +static void free_diff_words_data(struct emit_callback *ecbdata) +{ + if (ecbdata->diff_words) { + /* flush buffers */ + if (ecbdata->diff_words->minus.text.size || + ecbdata->diff_words->plus.text.size) + diff_words_show(ecbdata->diff_words); + + if (ecbdata->diff_words->minus.text.ptr) + free (ecbdata->diff_words->minus.text.ptr); + if (ecbdata->diff_words->plus.text.ptr) + free (ecbdata->diff_words->plus.text.ptr); + free(ecbdata->diff_words); + ecbdata->diff_words = NULL; + } +} + +const char *diff_get_color(int diff_use_color, enum color_diff ix) +{ + if (diff_use_color) + return diff_colors[ix]; + return ""; +} + +static void emit_line(const char *set, const char *reset, const char *line, int len) +{ + fputs(set, stdout); + fwrite(line, len, 1, stdout); + fputs(reset, stdout); +} + +static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len) +{ + const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE); + const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW); + + if (!*ws) + emit_line(set, reset, line, len); + else { + /* Emit just the prefix, then the rest. */ + emit_line(set, reset, line, ecbdata->nparents); + (void)check_and_emit_line(line + ecbdata->nparents, + len - ecbdata->nparents, ecbdata->ws_rule, + stdout, set, reset, ws); + } +} + +static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len) +{ + const char *cp; + unsigned long allot; + size_t l = len; + + if (ecb->truncate) + return ecb->truncate(line, len); + cp = line; + allot = l; + while (0 < l) { + (void) utf8_width(&cp, &l); + if (!cp) + break; /* truncated in the middle? */ + } + return allot - l; +} + +static void fn_out_consume(void *priv, char *line, unsigned long len) +{ + int i; + int color; + struct emit_callback *ecbdata = priv; + const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO); + const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN); + const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET); + + *(ecbdata->found_changesp) = 1; + + if (ecbdata->label_path[0]) { + const char *name_a_tab, *name_b_tab; + + name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : ""; + name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : ""; + + printf("%s--- %s%s%s\n", + meta, ecbdata->label_path[0], reset, name_a_tab); + printf("%s+++ %s%s%s\n", + meta, ecbdata->label_path[1], reset, name_b_tab); + ecbdata->label_path[0] = ecbdata->label_path[1] = NULL; + } + + /* This is not really necessary for now because + * this codepath only deals with two-way diffs. + */ + for (i = 0; i < len && line[i] == '@'; i++) + ; + if (2 <= i && i < len && line[i] == ' ') { + ecbdata->nparents = i - 1; + len = sane_truncate_line(ecbdata, line, len); + emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO), + reset, line, len); + if (line[len-1] != '\n') + putchar('\n'); + return; + } + + if (len < ecbdata->nparents) { + emit_line(reset, reset, line, len); + return; + } + + color = DIFF_PLAIN; + if (ecbdata->diff_words && ecbdata->nparents != 1) + /* fall back to normal diff */ + free_diff_words_data(ecbdata); + if (ecbdata->diff_words) { + if (line[0] == '-') { + diff_words_append(line, len, + &ecbdata->diff_words->minus); + return; + } else if (line[0] == '+') { + diff_words_append(line, len, + &ecbdata->diff_words->plus); + return; + } + if (ecbdata->diff_words->minus.text.size || + ecbdata->diff_words->plus.text.size) + diff_words_show(ecbdata->diff_words); + line++; + len--; + emit_line(plain, reset, line, len); + return; + } + for (i = 0; i < ecbdata->nparents && len; i++) { + if (line[i] == '-') + color = DIFF_FILE_OLD; + else if (line[i] == '+') + color = DIFF_FILE_NEW; + } + + if (color != DIFF_FILE_NEW) { + emit_line(diff_get_color(ecbdata->color_diff, color), + reset, line, len); + return; + } + emit_add_line(reset, ecbdata, line, len); +} + +static char *pprint_rename(const char *a, const char *b) +{ + const char *old = a; + const char *new = b; + struct strbuf name; + int pfx_length, sfx_length; + int len_a = strlen(a); + int len_b = strlen(b); + int a_midlen, b_midlen; + int qlen_a = quote_c_style(a, NULL, NULL, 0); + int qlen_b = quote_c_style(b, NULL, NULL, 0); + + strbuf_init(&name, 0); + if (qlen_a || qlen_b) { + quote_c_style(a, &name, NULL, 0); + strbuf_addstr(&name, " => "); + quote_c_style(b, &name, NULL, 0); + return strbuf_detach(&name, NULL); + } + + /* Find common prefix */ + pfx_length = 0; + while (*old && *new && *old == *new) { + if (*old == '/') + pfx_length = old - a + 1; + old++; + new++; + } + + /* Find common suffix */ + old = a + len_a; + new = b + len_b; + sfx_length = 0; + while (a <= old && b <= new && *old == *new) { + if (*old == '/') + sfx_length = len_a - (old - a); + old--; + new--; + } + + /* + * pfx{mid-a => mid-b}sfx + * {pfx-a => pfx-b}sfx + * pfx{sfx-a => sfx-b} + * name-a => name-b + */ + a_midlen = len_a - pfx_length - sfx_length; + b_midlen = len_b - pfx_length - sfx_length; + if (a_midlen < 0) + a_midlen = 0; + if (b_midlen < 0) + b_midlen = 0; + + strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7); + if (pfx_length + sfx_length) { + strbuf_add(&name, a, pfx_length); + strbuf_addch(&name, '{'); + } + strbuf_add(&name, a + pfx_length, a_midlen); + strbuf_addstr(&name, " => "); + strbuf_add(&name, b + pfx_length, b_midlen); + if (pfx_length + sfx_length) { + strbuf_addch(&name, '}'); + strbuf_add(&name, a + len_a - sfx_length, sfx_length); + } + return strbuf_detach(&name, NULL); +} + +struct diffstat_t { + struct xdiff_emit_state xm; + + int nr; + int alloc; + struct diffstat_file { + char *from_name; + char *name; + char *print_name; + unsigned is_unmerged:1; + unsigned is_binary:1; + unsigned is_renamed:1; + unsigned int added, deleted; + } **files; +}; + +static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat, + const char *name_a, + const char *name_b) +{ + struct diffstat_file *x; + x = xcalloc(sizeof (*x), 1); + if (diffstat->nr == diffstat->alloc) { + diffstat->alloc = alloc_nr(diffstat->alloc); + diffstat->files = xrealloc(diffstat->files, + diffstat->alloc * sizeof(x)); + } + diffstat->files[diffstat->nr++] = x; + if (name_b) { + x->from_name = xstrdup(name_a); + x->name = xstrdup(name_b); + x->is_renamed = 1; + } + else { + x->from_name = NULL; + x->name = xstrdup(name_a); + } + return x; +} + +static void diffstat_consume(void *priv, char *line, unsigned long len) +{ + struct diffstat_t *diffstat = priv; + struct diffstat_file *x = diffstat->files[diffstat->nr - 1]; + + if (line[0] == '+') + x->added++; + else if (line[0] == '-') + x->deleted++; +} + +const char mime_boundary_leader[] = "------------"; + +static int scale_linear(int it, int width, int max_change) +{ + /* + * make sure that at least one '-' is printed if there were deletions, + * and likewise for '+'. + */ + if (max_change < 2) + return it; + return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1); +} + +static void show_name(const char *prefix, const char *name, int len, + const char *reset, const char *set) +{ + printf(" %s%s%-*s%s |", set, prefix, len, name, reset); +} + +static void show_graph(char ch, int cnt, const char *set, const char *reset) +{ + if (cnt <= 0) + return; + printf("%s", set); + while (cnt--) + putchar(ch); + printf("%s", reset); +} + +static void fill_print_name(struct diffstat_file *file) +{ + char *pname; + + if (file->print_name) + return; + + if (!file->is_renamed) { + struct strbuf buf; + strbuf_init(&buf, 0); + if (quote_c_style(file->name, &buf, NULL, 0)) { + pname = strbuf_detach(&buf, NULL); + } else { + pname = file->name; + strbuf_release(&buf); + } + } else { + pname = pprint_rename(file->from_name, file->name); + } + file->print_name = pname; +} + +static void show_stats(struct diffstat_t* data, struct diff_options *options) +{ + int i, len, add, del, total, adds = 0, dels = 0; + int max_change = 0, max_len = 0; + int total_files = data->nr; + int width, name_width; + const char *reset, *set, *add_c, *del_c; + + if (data->nr == 0) + return; + + width = options->stat_width ? options->stat_width : 80; + name_width = options->stat_name_width ? options->stat_name_width : 50; + + /* Sanity: give at least 5 columns to the graph, + * but leave at least 10 columns for the name. + */ + if (width < name_width + 15) { + if (name_width <= 25) + width = name_width + 15; + else + name_width = width - 15; + } + + /* Find the longest filename and max number of changes */ + reset = diff_get_color_opt(options, DIFF_RESET); + set = diff_get_color_opt(options, DIFF_PLAIN); + add_c = diff_get_color_opt(options, DIFF_FILE_NEW); + del_c = diff_get_color_opt(options, DIFF_FILE_OLD); + + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + int change = file->added + file->deleted; + fill_print_name(file); + len = strlen(file->print_name); + if (max_len < len) + max_len = len; + + if (file->is_binary || file->is_unmerged) + continue; + if (max_change < change) + max_change = change; + } + + /* Compute the width of the graph part; + * 10 is for one blank at the beginning of the line plus + * " | count " between the name and the graph. + * + * From here on, name_width is the width of the name area, + * and width is the width of the graph area. + */ + name_width = (name_width < max_len) ? name_width : max_len; + if (width < (name_width + 10) + max_change) + width = width - (name_width + 10); + else + width = max_change; + + for (i = 0; i < data->nr; i++) { + const char *prefix = ""; + char *name = data->files[i]->print_name; + int added = data->files[i]->added; + int deleted = data->files[i]->deleted; + int name_len; + + /* + * "scale" the filename + */ + len = name_width; + name_len = strlen(name); + if (name_width < name_len) { + char *slash; + prefix = "..."; + len -= 3; + name += name_len - len; + slash = strchr(name, '/'); + if (slash) + name = slash; + } + + if (data->files[i]->is_binary) { + show_name(prefix, name, len, reset, set); + printf(" Bin "); + printf("%s%d%s", del_c, deleted, reset); + printf(" -> "); + printf("%s%d%s", add_c, added, reset); + printf(" bytes"); + printf("\n"); + continue; + } + else if (data->files[i]->is_unmerged) { + show_name(prefix, name, len, reset, set); + printf(" Unmerged\n"); + continue; + } + else if (!data->files[i]->is_renamed && + (added + deleted == 0)) { + total_files--; + continue; + } + + /* + * scale the add/delete + */ + add = added; + del = deleted; + total = add + del; + adds += add; + dels += del; + + if (width <= max_change) { + add = scale_linear(add, width, max_change); + del = scale_linear(del, width, max_change); + total = add + del; + } + show_name(prefix, name, len, reset, set); + printf("%5d ", added + deleted); + show_graph('+', add, add_c, reset); + show_graph('-', del, del_c, reset); + putchar('\n'); + } + printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n", + set, total_files, adds, dels, reset); +} + +static void show_shortstats(struct diffstat_t* data) +{ + int i, adds = 0, dels = 0, total_files = data->nr; + + if (data->nr == 0) + return; + + for (i = 0; i < data->nr; i++) { + if (!data->files[i]->is_binary && + !data->files[i]->is_unmerged) { + int added = data->files[i]->added; + int deleted= data->files[i]->deleted; + if (!data->files[i]->is_renamed && + (added + deleted == 0)) { + total_files--; + } else { + adds += added; + dels += deleted; + } + } + } + printf(" %d files changed, %d insertions(+), %d deletions(-)\n", + total_files, adds, dels); +} + +static void show_numstat(struct diffstat_t* data, struct diff_options *options) +{ + int i; + + if (data->nr == 0) + return; + + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + + if (file->is_binary) + printf("-\t-\t"); + else + printf("%d\t%d\t", file->added, file->deleted); + if (options->line_termination) { + fill_print_name(file); + if (!file->is_renamed) + write_name_quoted(file->name, stdout, + options->line_termination); + else { + fputs(file->print_name, stdout); + putchar(options->line_termination); + } + } else { + if (file->is_renamed) { + putchar('\0'); + write_name_quoted(file->from_name, stdout, '\0'); + } + write_name_quoted(file->name, stdout, '\0'); + } + } +} + +static void free_diffstat_info(struct diffstat_t *diffstat) +{ + int i; + for (i = 0; i < diffstat->nr; i++) { + struct diffstat_file *f = diffstat->files[i]; + if (f->name != f->print_name) + free(f->print_name); + free(f->name); + free(f->from_name); + free(f); + } + free(diffstat->files); +} + +struct checkdiff_t { + struct xdiff_emit_state xm; + const char *filename; + int lineno, color_diff; + unsigned ws_rule; + unsigned status; +}; + +static void checkdiff_consume(void *priv, char *line, unsigned long len) +{ + struct checkdiff_t *data = priv; + const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE); + const char *reset = diff_get_color(data->color_diff, DIFF_RESET); + const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW); + char *err; + + if (line[0] == '+') { + data->lineno++; + data->status = check_and_emit_line(line + 1, len - 1, + data->ws_rule, NULL, NULL, NULL, NULL); + if (!data->status) + return; + err = whitespace_error_string(data->status); + printf("%s:%d: %s.\n", data->filename, data->lineno, err); + free(err); + emit_line(set, reset, line, 1); + (void)check_and_emit_line(line + 1, len - 1, data->ws_rule, + stdout, set, reset, ws); + } else if (line[0] == ' ') + data->lineno++; + else if (line[0] == '@') { + char *plus = strchr(line, '+'); + if (plus) + data->lineno = strtol(plus, NULL, 10) - 1; + else + die("invalid diff"); + } +} + +static unsigned char *deflate_it(char *data, + unsigned long size, + unsigned long *result_size) +{ + int bound; + unsigned char *deflated; + z_stream stream; + + memset(&stream, 0, sizeof(stream)); + deflateInit(&stream, zlib_compression_level); + bound = deflateBound(&stream, size); + deflated = xmalloc(bound); + stream.next_out = deflated; + stream.avail_out = bound; + + stream.next_in = (unsigned char *)data; + stream.avail_in = size; + while (deflate(&stream, Z_FINISH) == Z_OK) + ; /* nothing */ + deflateEnd(&stream); + *result_size = stream.total_out; + return deflated; +} + +static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two) +{ + void *cp; + void *delta; + void *deflated; + void *data; + unsigned long orig_size; + unsigned long delta_size; + unsigned long deflate_size; + unsigned long data_size; + + /* We could do deflated delta, or we could do just deflated two, + * whichever is smaller. + */ + delta = NULL; + deflated = deflate_it(two->ptr, two->size, &deflate_size); + if (one->size && two->size) { + delta = diff_delta(one->ptr, one->size, + two->ptr, two->size, + &delta_size, deflate_size); + if (delta) { + void *to_free = delta; + orig_size = delta_size; + delta = deflate_it(delta, delta_size, &delta_size); + free(to_free); + } + } + + if (delta && delta_size < deflate_size) { + printf("delta %lu\n", orig_size); + free(deflated); + data = delta; + data_size = delta_size; + } + else { + printf("literal %lu\n", two->size); + free(delta); + data = deflated; + data_size = deflate_size; + } + + /* emit data encoded in base85 */ + cp = data; + while (data_size) { + int bytes = (52 < data_size) ? 52 : data_size; + char line[70]; + data_size -= bytes; + if (bytes <= 26) + line[0] = bytes + 'A' - 1; + else + line[0] = bytes - 26 + 'a' - 1; + encode_85(line + 1, cp, bytes); + cp = (char *) cp + bytes; + puts(line); + } + printf("\n"); + free(data); +} + +static void emit_binary_diff(mmfile_t *one, mmfile_t *two) +{ + printf("GIT binary patch\n"); + emit_binary_diff_body(one, two); + emit_binary_diff_body(two, one); +} + +static void setup_diff_attr_check(struct git_attr_check *check) +{ + static struct git_attr *attr_diff; + + if (!attr_diff) { + attr_diff = git_attr("diff", 4); + } + check[0].attr = attr_diff; +} + +static void diff_filespec_check_attr(struct diff_filespec *one) +{ + struct git_attr_check attr_diff_check; + int check_from_data = 0; + + if (one->checked_attr) + return; + + setup_diff_attr_check(&attr_diff_check); + one->is_binary = 0; + one->funcname_pattern_ident = NULL; + + if (!git_checkattr(one->path, 1, &attr_diff_check)) { + const char *value; + + /* binaryness */ + value = attr_diff_check.value; + if (ATTR_TRUE(value)) + ; + else if (ATTR_FALSE(value)) + one->is_binary = 1; + else + check_from_data = 1; + + /* funcname pattern ident */ + if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value)) + ; + else + one->funcname_pattern_ident = value; + } + + if (check_from_data) { + if (!one->data && DIFF_FILE_VALID(one)) + diff_populate_filespec(one, 0); + + if (one->data) + one->is_binary = buffer_is_binary(one->data, one->size); + } +} + +int diff_filespec_is_binary(struct diff_filespec *one) +{ + diff_filespec_check_attr(one); + return one->is_binary; +} + +static const char *funcname_pattern(const char *ident) +{ + struct funcname_pattern *pp; + + for (pp = funcname_pattern_list; pp; pp = pp->next) + if (!strcmp(ident, pp->name)) + return pp->pattern; + return NULL; +} + +static struct builtin_funcname_pattern { + const char *name; + const char *pattern; +} builtin_funcname_pattern[] = { + { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|" + "new\\|return\\|switch\\|throw\\|while\\)\n" + "^[ ]*\\(\\([ ]*" + "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}" + "[ ]*([^;]*$\\)" }, + { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" }, +}; + +static const char *diff_funcname_pattern(struct diff_filespec *one) +{ + const char *ident, *pattern; + int i; + + diff_filespec_check_attr(one); + ident = one->funcname_pattern_ident; + + if (!ident) + /* + * If the config file has "funcname.default" defined, that + * regexp is used; otherwise NULL is returned and xemit uses + * the built-in default. + */ + return funcname_pattern("default"); + + /* Look up custom "funcname.$ident" regexp from config. */ + pattern = funcname_pattern(ident); + if (pattern) + return pattern; + + /* + * And define built-in fallback patterns here. Note that + * these can be overridden by the user's config settings. + */ + for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++) + if (!strcmp(ident, builtin_funcname_pattern[i].name)) + return builtin_funcname_pattern[i].pattern; + + return NULL; +} + +static void builtin_diff(const char *name_a, + const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + const char *xfrm_msg, + struct diff_options *o, + int complete_rewrite) +{ + mmfile_t mf1, mf2; + const char *lbl[2]; + char *a_one, *b_two; + const char *set = diff_get_color_opt(o, DIFF_METAINFO); + const char *reset = diff_get_color_opt(o, DIFF_RESET); + + a_one = quote_two(o->a_prefix, name_a + (*name_a == '/')); + b_two = quote_two(o->b_prefix, name_b + (*name_b == '/')); + lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null"; + lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null"; + printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset); + if (lbl[0][0] == '/') { + /* /dev/null */ + printf("%snew file mode %06o%s\n", set, two->mode, reset); + if (xfrm_msg && xfrm_msg[0]) + printf("%s%s%s\n", set, xfrm_msg, reset); + } + else if (lbl[1][0] == '/') { + printf("%sdeleted file mode %06o%s\n", set, one->mode, reset); + if (xfrm_msg && xfrm_msg[0]) + printf("%s%s%s\n", set, xfrm_msg, reset); + } + else { + if (one->mode != two->mode) { + printf("%sold mode %06o%s\n", set, one->mode, reset); + printf("%snew mode %06o%s\n", set, two->mode, reset); + } + if (xfrm_msg && xfrm_msg[0]) + printf("%s%s%s\n", set, xfrm_msg, reset); + /* + * we do not run diff between different kind + * of objects. + */ + if ((one->mode ^ two->mode) & S_IFMT) + goto free_ab_and_return; + if (complete_rewrite) { + emit_rewrite_diff(name_a, name_b, one, two, o); + o->found_changes = 1; + goto free_ab_and_return; + } + } + + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + + if (!DIFF_OPT_TST(o, TEXT) && + (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) { + /* Quite common confusing case */ + if (mf1.size == mf2.size && + !memcmp(mf1.ptr, mf2.ptr, mf1.size)) + goto free_ab_and_return; + if (DIFF_OPT_TST(o, BINARY)) + emit_binary_diff(&mf1, &mf2); + else + printf("Binary files %s and %s differ\n", + lbl[0], lbl[1]); + o->found_changes = 1; + } + else { + /* Crazy xdl interfaces.. */ + const char *diffopts = getenv("GIT_DIFF_OPTS"); + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + struct emit_callback ecbdata; + const char *funcname_pattern; + + funcname_pattern = diff_funcname_pattern(one); + if (!funcname_pattern) + funcname_pattern = diff_funcname_pattern(two); + + memset(&xecfg, 0, sizeof(xecfg)); + memset(&ecbdata, 0, sizeof(ecbdata)); + ecbdata.label_path = lbl; + ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF); + ecbdata.found_changesp = &o->found_changes; + ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a); + xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts; + xecfg.ctxlen = o->context; + xecfg.flags = XDL_EMIT_FUNCNAMES; + if (funcname_pattern) + xdiff_set_find_func(&xecfg, funcname_pattern); + if (!diffopts) + ; + else if (!prefixcmp(diffopts, "--unified=")) + xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10); + else if (!prefixcmp(diffopts, "-u")) + xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10); + ecb.outf = xdiff_outf; + ecb.priv = &ecbdata; + ecbdata.xm.consume = fn_out_consume; + if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) + ecbdata.diff_words = + xcalloc(1, sizeof(struct diff_words_data)); + xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb); + if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) + free_diff_words_data(&ecbdata); + } + + free_ab_and_return: + diff_free_filespec_data(one); + diff_free_filespec_data(two); + free(a_one); + free(b_two); + return; +} + +static void builtin_diffstat(const char *name_a, const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + struct diffstat_t *diffstat, + struct diff_options *o, + int complete_rewrite) +{ + mmfile_t mf1, mf2; + struct diffstat_file *data; + + data = diffstat_add(diffstat, name_a, name_b); + + if (!one || !two) { + data->is_unmerged = 1; + return; + } + if (complete_rewrite) { + diff_populate_filespec(one, 0); + diff_populate_filespec(two, 0); + data->deleted = count_lines(one->data, one->size); + data->added = count_lines(two->data, two->size); + goto free_and_return; + } + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + + if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) { + data->is_binary = 1; + data->added = mf2.size; + data->deleted = mf1.size; + } else { + /* Crazy xdl interfaces.. */ + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + + memset(&xecfg, 0, sizeof(xecfg)); + xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts; + ecb.outf = xdiff_outf; + ecb.priv = diffstat; + xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb); + } + + free_and_return: + diff_free_filespec_data(one); + diff_free_filespec_data(two); +} + +static void builtin_checkdiff(const char *name_a, const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, struct diff_options *o) +{ + mmfile_t mf1, mf2; + struct checkdiff_t data; + + if (!two) + return; + + memset(&data, 0, sizeof(data)); + data.xm.consume = checkdiff_consume; + data.filename = name_b ? name_b : name_a; + data.lineno = 0; + data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF); + data.ws_rule = whitespace_rule(data.filename); + + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + + if (diff_filespec_is_binary(two)) + goto free_and_return; + else { + /* Crazy xdl interfaces.. */ + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + + memset(&xecfg, 0, sizeof(xecfg)); + xpp.flags = XDF_NEED_MINIMAL; + ecb.outf = xdiff_outf; + ecb.priv = &data; + xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb); + } + free_and_return: + diff_free_filespec_data(one); + diff_free_filespec_data(two); + if (data.status) + DIFF_OPT_SET(o, CHECK_FAILED); +} + +struct diff_filespec *alloc_filespec(const char *path) +{ + int namelen = strlen(path); + struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1); + + memset(spec, 0, sizeof(*spec)); + spec->path = (char *)(spec + 1); + memcpy(spec->path, path, namelen+1); + spec->count = 1; + return spec; +} + +void free_filespec(struct diff_filespec *spec) +{ + if (!--spec->count) { + diff_free_filespec_data(spec); + free(spec); + } +} + +void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1, + unsigned short mode) +{ + if (mode) { + spec->mode = canon_mode(mode); + hashcpy(spec->sha1, sha1); + spec->sha1_valid = !is_null_sha1(sha1); + } +} + +/* + * Given a name and sha1 pair, if the index tells us the file in + * the work tree has that object contents, return true, so that + * prepare_temp_file() does not have to inflate and extract. + */ +static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file) +{ + struct cache_entry *ce; + struct stat st; + int pos, len; + + /* We do not read the cache ourselves here, because the + * benchmark with my previous version that always reads cache + * shows that it makes things worse for diff-tree comparing + * two linux-2.6 kernel trees in an already checked out work + * tree. This is because most diff-tree comparisons deal with + * only a small number of files, while reading the cache is + * expensive for a large project, and its cost outweighs the + * savings we get by not inflating the object to a temporary + * file. Practically, this code only helps when we are used + * by diff-cache --cached, which does read the cache before + * calling us. + */ + if (!active_cache) + return 0; + + /* We want to avoid the working directory if our caller + * doesn't need the data in a normal file, this system + * is rather slow with its stat/open/mmap/close syscalls, + * and the object is contained in a pack file. The pack + * is probably already open and will be faster to obtain + * the data through than the working directory. Loose + * objects however would tend to be slower as they need + * to be individually opened and inflated. + */ + if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL)) + return 0; + + len = strlen(name); + pos = cache_name_pos(name, len); + if (pos < 0) + return 0; + ce = active_cache[pos]; + if ((lstat(name, &st) < 0) || + !S_ISREG(st.st_mode) || /* careful! */ + ce_match_stat(ce, &st, 0) || + hashcmp(sha1, ce->sha1)) + return 0; + /* we return 1 only when we can stat, it is a regular file, + * stat information matches, and sha1 recorded in the cache + * matches. I.e. we know the file in the work tree really is + * the same as the <name, sha1> pair. + */ + return 1; +} + +static int populate_from_stdin(struct diff_filespec *s) +{ + struct strbuf buf; + size_t size = 0; + + strbuf_init(&buf, 0); + if (strbuf_read(&buf, 0, 0) < 0) + return error("error while reading from stdin %s", + strerror(errno)); + + s->should_munmap = 0; + s->data = strbuf_detach(&buf, &size); + s->size = size; + s->should_free = 1; + return 0; +} + +static int diff_populate_gitlink(struct diff_filespec *s, int size_only) +{ + int len; + char *data = xmalloc(100); + len = snprintf(data, 100, + "Subproject commit %s\n", sha1_to_hex(s->sha1)); + s->data = data; + s->size = len; + s->should_free = 1; + if (size_only) { + s->data = NULL; + free(data); + } + return 0; +} + +/* + * While doing rename detection and pickaxe operation, we may need to + * grab the data for the blob (or file) for our own in-core comparison. + * diff_filespec has data and size fields for this purpose. + */ +int diff_populate_filespec(struct diff_filespec *s, int size_only) +{ + int err = 0; + if (!DIFF_FILE_VALID(s)) + die("internal error: asking to populate invalid file."); + if (S_ISDIR(s->mode)) + return -1; + + if (s->data) + return 0; + + if (size_only && 0 < s->size) + return 0; + + if (S_ISGITLINK(s->mode)) + return diff_populate_gitlink(s, size_only); + + if (!s->sha1_valid || + reuse_worktree_file(s->path, s->sha1, 0)) { + struct strbuf buf; + struct stat st; + int fd; + + if (!strcmp(s->path, "-")) + return populate_from_stdin(s); + + if (lstat(s->path, &st) < 0) { + if (errno == ENOENT) { + err_empty: + err = -1; + empty: + s->data = (char *)""; + s->size = 0; + return err; + } + } + s->size = xsize_t(st.st_size); + if (!s->size) + goto empty; + if (size_only) + return 0; + if (S_ISLNK(st.st_mode)) { + int ret; + s->data = xmalloc(s->size); + s->should_free = 1; + ret = readlink(s->path, s->data, s->size); + if (ret < 0) { + free(s->data); + goto err_empty; + } + return 0; + } + fd = open(s->path, O_RDONLY); + if (fd < 0) + goto err_empty; + s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0); + close(fd); + s->should_munmap = 1; + + /* + * Convert from working tree format to canonical git format + */ + strbuf_init(&buf, 0); + if (convert_to_git(s->path, s->data, s->size, &buf)) { + size_t size = 0; + munmap(s->data, s->size); + s->should_munmap = 0; + s->data = strbuf_detach(&buf, &size); + s->size = size; + s->should_free = 1; + } + } + else { + enum object_type type; + if (size_only) + type = sha1_object_info(s->sha1, &s->size); + else { + s->data = read_sha1_file(s->sha1, &type, &s->size); + s->should_free = 1; + } + } + return 0; +} + +void diff_free_filespec_blob(struct diff_filespec *s) +{ + if (s->should_free) + free(s->data); + else if (s->should_munmap) + munmap(s->data, s->size); + + if (s->should_free || s->should_munmap) { + s->should_free = s->should_munmap = 0; + s->data = NULL; + } +} + +void diff_free_filespec_data(struct diff_filespec *s) +{ + diff_free_filespec_blob(s); + free(s->cnt_data); + s->cnt_data = NULL; +} + +static void prep_temp_blob(struct diff_tempfile *temp, + void *blob, + unsigned long size, + const unsigned char *sha1, + int mode) +{ + int fd; + + fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX"); + if (fd < 0) + die("unable to create temp-file: %s", strerror(errno)); + if (write_in_full(fd, blob, size) != size) + die("unable to write temp-file"); + close(fd); + temp->name = temp->tmp_path; + strcpy(temp->hex, sha1_to_hex(sha1)); + temp->hex[40] = 0; + sprintf(temp->mode, "%06o", mode); +} + +static void prepare_temp_file(const char *name, + struct diff_tempfile *temp, + struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) { + not_a_valid_file: + /* A '-' entry produces this for file-2, and + * a '+' entry produces this for file-1. + */ + temp->name = "/dev/null"; + strcpy(temp->hex, "."); + strcpy(temp->mode, "."); + return; + } + + if (!one->sha1_valid || + reuse_worktree_file(name, one->sha1, 1)) { + struct stat st; + if (lstat(name, &st) < 0) { + if (errno == ENOENT) + goto not_a_valid_file; + die("stat(%s): %s", name, strerror(errno)); + } + if (S_ISLNK(st.st_mode)) { + int ret; + char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */ + size_t sz = xsize_t(st.st_size); + if (sizeof(buf) <= st.st_size) + die("symlink too long: %s", name); + ret = readlink(name, buf, sz); + if (ret < 0) + die("readlink(%s)", name); + prep_temp_blob(temp, buf, sz, + (one->sha1_valid ? + one->sha1 : null_sha1), + (one->sha1_valid ? + one->mode : S_IFLNK)); + } + else { + /* we can borrow from the file in the work tree */ + temp->name = name; + if (!one->sha1_valid) + strcpy(temp->hex, sha1_to_hex(null_sha1)); + else + strcpy(temp->hex, sha1_to_hex(one->sha1)); + /* Even though we may sometimes borrow the + * contents from the work tree, we always want + * one->mode. mode is trustworthy even when + * !(one->sha1_valid), as long as + * DIFF_FILE_VALID(one). + */ + sprintf(temp->mode, "%06o", one->mode); + } + return; + } + else { + if (diff_populate_filespec(one, 0)) + die("cannot read data blob for %s", one->path); + prep_temp_blob(temp, one->data, one->size, + one->sha1, one->mode); + } +} + +static void remove_tempfile(void) +{ + int i; + + for (i = 0; i < 2; i++) + if (diff_temp[i].name == diff_temp[i].tmp_path) { + unlink(diff_temp[i].name); + diff_temp[i].name = NULL; + } +} + +static void remove_tempfile_on_signal(int signo) +{ + remove_tempfile(); + signal(SIGINT, SIG_DFL); + raise(signo); +} + +/* An external diff command takes: + * + * diff-cmd name infile1 infile1-sha1 infile1-mode \ + * infile2 infile2-sha1 infile2-mode [ rename-to ] + * + */ +static void run_external_diff(const char *pgm, + const char *name, + const char *other, + struct diff_filespec *one, + struct diff_filespec *two, + const char *xfrm_msg, + int complete_rewrite) +{ + const char *spawn_arg[10]; + struct diff_tempfile *temp = diff_temp; + int retval; + static int atexit_asked = 0; + const char *othername; + const char **arg = &spawn_arg[0]; + + othername = (other? other : name); + if (one && two) { + prepare_temp_file(name, &temp[0], one); + prepare_temp_file(othername, &temp[1], two); + if (! atexit_asked && + (temp[0].name == temp[0].tmp_path || + temp[1].name == temp[1].tmp_path)) { + atexit_asked = 1; + atexit(remove_tempfile); + } + signal(SIGINT, remove_tempfile_on_signal); + } + + if (one && two) { + *arg++ = pgm; + *arg++ = name; + *arg++ = temp[0].name; + *arg++ = temp[0].hex; + *arg++ = temp[0].mode; + *arg++ = temp[1].name; + *arg++ = temp[1].hex; + *arg++ = temp[1].mode; + if (other) { + *arg++ = other; + *arg++ = xfrm_msg; + } + } else { + *arg++ = pgm; + *arg++ = name; + } + *arg = NULL; + fflush(NULL); + retval = run_command_v_opt(spawn_arg, 0); + remove_tempfile(); + if (retval) { + fprintf(stderr, "external diff died, stopping at %s.\n", name); + exit(1); + } +} + +static const char *external_diff_attr(const char *name) +{ + struct git_attr_check attr_diff_check; + + setup_diff_attr_check(&attr_diff_check); + if (!git_checkattr(name, 1, &attr_diff_check)) { + const char *value = attr_diff_check.value; + if (!ATTR_TRUE(value) && + !ATTR_FALSE(value) && + !ATTR_UNSET(value)) { + struct ll_diff_driver *drv; + + for (drv = user_diff; drv; drv = drv->next) + if (!strcmp(drv->name, value)) + return drv->cmd; + } + } + return NULL; +} + +static void run_diff_cmd(const char *pgm, + const char *name, + const char *other, + struct diff_filespec *one, + struct diff_filespec *two, + const char *xfrm_msg, + struct diff_options *o, + int complete_rewrite) +{ + if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL)) + pgm = NULL; + else { + const char *cmd = external_diff_attr(name); + if (cmd) + pgm = cmd; + } + + if (pgm) { + run_external_diff(pgm, name, other, one, two, xfrm_msg, + complete_rewrite); + return; + } + if (one && two) + builtin_diff(name, other ? other : name, + one, two, xfrm_msg, o, complete_rewrite); + else + printf("* Unmerged path %s\n", name); +} + +static void diff_fill_sha1_info(struct diff_filespec *one) +{ + if (DIFF_FILE_VALID(one)) { + if (!one->sha1_valid) { + struct stat st; + if (!strcmp(one->path, "-")) { + hashcpy(one->sha1, null_sha1); + return; + } + if (lstat(one->path, &st) < 0) + die("stat %s", one->path); + if (index_path(one->sha1, one->path, &st, 0)) + die("cannot hash %s\n", one->path); + } + } + else + hashclr(one->sha1); +} + +static int similarity_index(struct diff_filepair *p) +{ + return p->score * 100 / MAX_SCORE; +} + +static void run_diff(struct diff_filepair *p, struct diff_options *o) +{ + const char *pgm = external_diff(); + struct strbuf msg; + char *xfrm_msg; + struct diff_filespec *one = p->one; + struct diff_filespec *two = p->two; + const char *name; + const char *other; + int complete_rewrite = 0; + + + if (DIFF_PAIR_UNMERGED(p)) { + run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0); + return; + } + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + diff_fill_sha1_info(one); + diff_fill_sha1_info(two); + + strbuf_init(&msg, PATH_MAX * 2 + 300); + switch (p->status) { + case DIFF_STATUS_COPIED: + strbuf_addf(&msg, "similarity index %d%%", similarity_index(p)); + strbuf_addstr(&msg, "\ncopy from "); + quote_c_style(name, &msg, NULL, 0); + strbuf_addstr(&msg, "\ncopy to "); + quote_c_style(other, &msg, NULL, 0); + strbuf_addch(&msg, '\n'); + break; + case DIFF_STATUS_RENAMED: + strbuf_addf(&msg, "similarity index %d%%", similarity_index(p)); + strbuf_addstr(&msg, "\nrename from "); + quote_c_style(name, &msg, NULL, 0); + strbuf_addstr(&msg, "\nrename to "); + quote_c_style(other, &msg, NULL, 0); + strbuf_addch(&msg, '\n'); + break; + case DIFF_STATUS_MODIFIED: + if (p->score) { + strbuf_addf(&msg, "dissimilarity index %d%%\n", + similarity_index(p)); + complete_rewrite = 1; + break; + } + /* fallthru */ + default: + /* nothing */ + ; + } + + if (hashcmp(one->sha1, two->sha1)) { + int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV; + + if (DIFF_OPT_TST(o, BINARY)) { + mmfile_t mf; + if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) || + (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two))) + abbrev = 40; + } + strbuf_addf(&msg, "index %.*s..%.*s", + abbrev, sha1_to_hex(one->sha1), + abbrev, sha1_to_hex(two->sha1)); + if (one->mode == two->mode) + strbuf_addf(&msg, " %06o", one->mode); + strbuf_addch(&msg, '\n'); + } + + if (msg.len) + strbuf_setlen(&msg, msg.len - 1); + xfrm_msg = msg.len ? msg.buf : NULL; + + if (!pgm && + DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) && + (S_IFMT & one->mode) != (S_IFMT & two->mode)) { + /* a filepair that changes between file and symlink + * needs to be split into deletion and creation. + */ + struct diff_filespec *null = alloc_filespec(two->path); + run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0); + free(null); + null = alloc_filespec(one->path); + run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0); + free(null); + } + else + run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o, + complete_rewrite); + + strbuf_release(&msg); +} + +static void run_diffstat(struct diff_filepair *p, struct diff_options *o, + struct diffstat_t *diffstat) +{ + const char *name; + const char *other; + int complete_rewrite = 0; + + if (DIFF_PAIR_UNMERGED(p)) { + /* unmerged */ + builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0); + return; + } + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + + diff_fill_sha1_info(p->one); + diff_fill_sha1_info(p->two); + + if (p->status == DIFF_STATUS_MODIFIED && p->score) + complete_rewrite = 1; + builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite); +} + +static void run_checkdiff(struct diff_filepair *p, struct diff_options *o) +{ + const char *name; + const char *other; + + if (DIFF_PAIR_UNMERGED(p)) { + /* unmerged */ + return; + } + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + + diff_fill_sha1_info(p->one); + diff_fill_sha1_info(p->two); + + builtin_checkdiff(name, other, p->one, p->two, o); +} + +void diff_setup(struct diff_options *options) +{ + memset(options, 0, sizeof(*options)); + options->line_termination = '\n'; + options->break_opt = -1; + options->rename_limit = -1; + options->context = 3; + options->msg_sep = ""; + + options->change = diff_change; + options->add_remove = diff_addremove; + if (diff_use_color_default) + DIFF_OPT_SET(options, COLOR_DIFF); + else + DIFF_OPT_CLR(options, COLOR_DIFF); + options->detect_rename = diff_detect_rename_default; + + options->a_prefix = "a/"; + options->b_prefix = "b/"; +} + +int diff_setup_done(struct diff_options *options) +{ + int count = 0; + + if (options->output_format & DIFF_FORMAT_NAME) + count++; + if (options->output_format & DIFF_FORMAT_NAME_STATUS) + count++; + if (options->output_format & DIFF_FORMAT_CHECKDIFF) + count++; + if (options->output_format & DIFF_FORMAT_NO_OUTPUT) + count++; + if (count > 1) + die("--name-only, --name-status, --check and -s are mutually exclusive"); + + if (DIFF_OPT_TST(options, FIND_COPIES_HARDER)) + options->detect_rename = DIFF_DETECT_COPY; + + if (options->output_format & (DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF | + DIFF_FORMAT_NO_OUTPUT)) + options->output_format &= ~(DIFF_FORMAT_RAW | + DIFF_FORMAT_NUMSTAT | + DIFF_FORMAT_DIFFSTAT | + DIFF_FORMAT_SHORTSTAT | + DIFF_FORMAT_SUMMARY | + DIFF_FORMAT_PATCH); + + /* + * These cases always need recursive; we do not drop caller-supplied + * recursive bits for other formats here. + */ + if (options->output_format & (DIFF_FORMAT_PATCH | + DIFF_FORMAT_NUMSTAT | + DIFF_FORMAT_DIFFSTAT | + DIFF_FORMAT_SHORTSTAT | + DIFF_FORMAT_SUMMARY | + DIFF_FORMAT_CHECKDIFF)) + DIFF_OPT_SET(options, RECURSIVE); + /* + * Also pickaxe would not work very well if you do not say recursive + */ + if (options->pickaxe) + DIFF_OPT_SET(options, RECURSIVE); + + if (options->detect_rename && options->rename_limit < 0) + options->rename_limit = diff_rename_limit_default; + if (options->setup & DIFF_SETUP_USE_CACHE) { + if (!active_cache) + /* read-cache does not die even when it fails + * so it is safe for us to do this here. Also + * it does not smudge active_cache or active_nr + * when it fails, so we do not have to worry about + * cleaning it up ourselves either. + */ + read_cache(); + } + if (options->abbrev <= 0 || 40 < options->abbrev) + options->abbrev = 40; /* full */ + + /* + * It does not make sense to show the first hit we happened + * to have found. It does not make sense not to return with + * exit code in such a case either. + */ + if (DIFF_OPT_TST(options, QUIET)) { + options->output_format = DIFF_FORMAT_NO_OUTPUT; + DIFF_OPT_SET(options, EXIT_WITH_STATUS); + } + + /* + * If we postprocess in diffcore, we cannot simply return + * upon the first hit. We need to run diff as usual. + */ + if (options->pickaxe || options->filter) + DIFF_OPT_CLR(options, QUIET); + + return 0; +} + +static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val) +{ + char c, *eq; + int len; + + if (*arg != '-') + return 0; + c = *++arg; + if (!c) + return 0; + if (c == arg_short) { + c = *++arg; + if (!c) + return 1; + if (val && isdigit(c)) { + char *end; + int n = strtoul(arg, &end, 10); + if (*end) + return 0; + *val = n; + return 1; + } + return 0; + } + if (c != '-') + return 0; + arg++; + eq = strchr(arg, '='); + if (eq) + len = eq - arg; + else + len = strlen(arg); + if (!len || strncmp(arg, arg_long, len)) + return 0; + if (eq) { + int n; + char *end; + if (!isdigit(*++eq)) + return 0; + n = strtoul(eq, &end, 10); + if (*end) + return 0; + *val = n; + } + return 1; +} + +static int diff_scoreopt_parse(const char *opt); + +int diff_opt_parse(struct diff_options *options, const char **av, int ac) +{ + const char *arg = av[0]; + + /* Output format options */ + if (!strcmp(arg, "-p") || !strcmp(arg, "-u")) + options->output_format |= DIFF_FORMAT_PATCH; + else if (opt_arg(arg, 'U', "unified", &options->context)) + options->output_format |= DIFF_FORMAT_PATCH; + else if (!strcmp(arg, "--raw")) + options->output_format |= DIFF_FORMAT_RAW; + else if (!strcmp(arg, "--patch-with-raw")) + options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW; + else if (!strcmp(arg, "--numstat")) + options->output_format |= DIFF_FORMAT_NUMSTAT; + else if (!strcmp(arg, "--shortstat")) + options->output_format |= DIFF_FORMAT_SHORTSTAT; + else if (!strcmp(arg, "--check")) + options->output_format |= DIFF_FORMAT_CHECKDIFF; + else if (!strcmp(arg, "--summary")) + options->output_format |= DIFF_FORMAT_SUMMARY; + else if (!strcmp(arg, "--patch-with-stat")) + options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT; + else if (!strcmp(arg, "--name-only")) + options->output_format |= DIFF_FORMAT_NAME; + else if (!strcmp(arg, "--name-status")) + options->output_format |= DIFF_FORMAT_NAME_STATUS; + else if (!strcmp(arg, "-s")) + options->output_format |= DIFF_FORMAT_NO_OUTPUT; + else if (!prefixcmp(arg, "--stat")) { + char *end; + int width = options->stat_width; + int name_width = options->stat_name_width; + arg += 6; + end = (char *)arg; + + switch (*arg) { + case '-': + if (!prefixcmp(arg, "-width=")) + width = strtoul(arg + 7, &end, 10); + else if (!prefixcmp(arg, "-name-width=")) + name_width = strtoul(arg + 12, &end, 10); + break; + case '=': + width = strtoul(arg+1, &end, 10); + if (*end == ',') + name_width = strtoul(end+1, &end, 10); + } + + /* Important! This checks all the error cases! */ + if (*end) + return 0; + options->output_format |= DIFF_FORMAT_DIFFSTAT; + options->stat_name_width = name_width; + options->stat_width = width; + } + + /* renames options */ + else if (!prefixcmp(arg, "-B")) { + if ((options->break_opt = diff_scoreopt_parse(arg)) == -1) + return -1; + } + else if (!prefixcmp(arg, "-M")) { + if ((options->rename_score = diff_scoreopt_parse(arg)) == -1) + return -1; + options->detect_rename = DIFF_DETECT_RENAME; + } + else if (!prefixcmp(arg, "-C")) { + if (options->detect_rename == DIFF_DETECT_COPY) + DIFF_OPT_SET(options, FIND_COPIES_HARDER); + if ((options->rename_score = diff_scoreopt_parse(arg)) == -1) + return -1; + options->detect_rename = DIFF_DETECT_COPY; + } + else if (!strcmp(arg, "--no-renames")) + options->detect_rename = 0; + + /* xdiff options */ + else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space")) + options->xdl_opts |= XDF_IGNORE_WHITESPACE; + else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change")) + options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE; + else if (!strcmp(arg, "--ignore-space-at-eol")) + options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL; + + /* flags options */ + else if (!strcmp(arg, "--binary")) { + options->output_format |= DIFF_FORMAT_PATCH; + DIFF_OPT_SET(options, BINARY); + } + else if (!strcmp(arg, "--full-index")) + DIFF_OPT_SET(options, FULL_INDEX); + else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) + DIFF_OPT_SET(options, TEXT); + else if (!strcmp(arg, "-R")) + DIFF_OPT_SET(options, REVERSE_DIFF); + else if (!strcmp(arg, "--find-copies-harder")) + DIFF_OPT_SET(options, FIND_COPIES_HARDER); + else if (!strcmp(arg, "--follow")) + DIFF_OPT_SET(options, FOLLOW_RENAMES); + else if (!strcmp(arg, "--color")) + DIFF_OPT_SET(options, COLOR_DIFF); + else if (!strcmp(arg, "--no-color")) + DIFF_OPT_CLR(options, COLOR_DIFF); + else if (!strcmp(arg, "--color-words")) + options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS; + else if (!strcmp(arg, "--exit-code")) + DIFF_OPT_SET(options, EXIT_WITH_STATUS); + else if (!strcmp(arg, "--quiet")) + DIFF_OPT_SET(options, QUIET); + else if (!strcmp(arg, "--ext-diff")) + DIFF_OPT_SET(options, ALLOW_EXTERNAL); + else if (!strcmp(arg, "--no-ext-diff")) + DIFF_OPT_CLR(options, ALLOW_EXTERNAL); + + /* misc options */ + else if (!strcmp(arg, "-z")) + options->line_termination = 0; + else if (!prefixcmp(arg, "-l")) + options->rename_limit = strtoul(arg+2, NULL, 10); + else if (!prefixcmp(arg, "-S")) + options->pickaxe = arg + 2; + else if (!strcmp(arg, "--pickaxe-all")) + options->pickaxe_opts = DIFF_PICKAXE_ALL; + else if (!strcmp(arg, "--pickaxe-regex")) + options->pickaxe_opts = DIFF_PICKAXE_REGEX; + else if (!prefixcmp(arg, "-O")) + options->orderfile = arg + 2; + else if (!prefixcmp(arg, "--diff-filter=")) + options->filter = arg + 14; + else if (!strcmp(arg, "--abbrev")) + options->abbrev = DEFAULT_ABBREV; + else if (!prefixcmp(arg, "--abbrev=")) { + options->abbrev = strtoul(arg + 9, NULL, 10); + if (options->abbrev < MINIMUM_ABBREV) + options->abbrev = MINIMUM_ABBREV; + else if (40 < options->abbrev) + options->abbrev = 40; + } + else if (!prefixcmp(arg, "--src-prefix=")) + options->a_prefix = arg + 13; + else if (!prefixcmp(arg, "--dst-prefix=")) + options->b_prefix = arg + 13; + else if (!strcmp(arg, "--no-prefix")) + options->a_prefix = options->b_prefix = ""; + else + return 0; + return 1; +} + +static int parse_num(const char **cp_p) +{ + unsigned long num, scale; + int ch, dot; + const char *cp = *cp_p; + + num = 0; + scale = 1; + dot = 0; + for(;;) { + ch = *cp; + if ( !dot && ch == '.' ) { + scale = 1; + dot = 1; + } else if ( ch == '%' ) { + scale = dot ? scale*100 : 100; + cp++; /* % is always at the end */ + break; + } else if ( ch >= '0' && ch <= '9' ) { + if ( scale < 100000 ) { + scale *= 10; + num = (num*10) + (ch-'0'); + } + } else { + break; + } + cp++; + } + *cp_p = cp; + + /* user says num divided by scale and we say internally that + * is MAX_SCORE * num / scale. + */ + return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale)); +} + +static int diff_scoreopt_parse(const char *opt) +{ + int opt1, opt2, cmd; + + if (*opt++ != '-') + return -1; + cmd = *opt++; + if (cmd != 'M' && cmd != 'C' && cmd != 'B') + return -1; /* that is not a -M, -C nor -B option */ + + opt1 = parse_num(&opt); + if (cmd != 'B') + opt2 = 0; + else { + if (*opt == 0) + opt2 = 0; + else if (*opt != '/') + return -1; /* we expect -B80/99 or -B80 */ + else { + opt++; + opt2 = parse_num(&opt); + } + } + if (*opt != 0) + return -1; + return opt1 | (opt2 << 16); +} + +struct diff_queue_struct diff_queued_diff; + +void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp) +{ + if (queue->alloc <= queue->nr) { + queue->alloc = alloc_nr(queue->alloc); + queue->queue = xrealloc(queue->queue, + sizeof(dp) * queue->alloc); + } + queue->queue[queue->nr++] = dp; +} + +struct diff_filepair *diff_queue(struct diff_queue_struct *queue, + struct diff_filespec *one, + struct diff_filespec *two) +{ + struct diff_filepair *dp = xcalloc(1, sizeof(*dp)); + dp->one = one; + dp->two = two; + if (queue) + diff_q(queue, dp); + return dp; +} + +void diff_free_filepair(struct diff_filepair *p) +{ + free_filespec(p->one); + free_filespec(p->two); + free(p); +} + +/* This is different from find_unique_abbrev() in that + * it stuffs the result with dots for alignment. + */ +const char *diff_unique_abbrev(const unsigned char *sha1, int len) +{ + int abblen; + const char *abbrev; + if (len == 40) + return sha1_to_hex(sha1); + + abbrev = find_unique_abbrev(sha1, len); + if (!abbrev) + return sha1_to_hex(sha1); + abblen = strlen(abbrev); + if (abblen < 37) { + static char hex[41]; + if (len < abblen && abblen <= len + 2) + sprintf(hex, "%s%.*s", abbrev, len+3-abblen, ".."); + else + sprintf(hex, "%s...", abbrev); + return hex; + } + return sha1_to_hex(sha1); +} + +static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt) +{ + int line_termination = opt->line_termination; + int inter_name_termination = line_termination ? '\t' : '\0'; + + if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) { + printf(":%06o %06o %s ", p->one->mode, p->two->mode, + diff_unique_abbrev(p->one->sha1, opt->abbrev)); + printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev)); + } + if (p->score) { + printf("%c%03d%c", p->status, similarity_index(p), + inter_name_termination); + } else { + printf("%c%c", p->status, inter_name_termination); + } + + if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) { + write_name_quoted(p->one->path, stdout, inter_name_termination); + write_name_quoted(p->two->path, stdout, line_termination); + } else { + const char *path = p->one->mode ? p->one->path : p->two->path; + write_name_quoted(path, stdout, line_termination); + } +} + +int diff_unmodified_pair(struct diff_filepair *p) +{ + /* This function is written stricter than necessary to support + * the currently implemented transformers, but the idea is to + * let transformers to produce diff_filepairs any way they want, + * and filter and clean them up here before producing the output. + */ + struct diff_filespec *one = p->one, *two = p->two; + + if (DIFF_PAIR_UNMERGED(p)) + return 0; /* unmerged is interesting */ + + /* deletion, addition, mode or type change + * and rename are all interesting. + */ + if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) || + DIFF_PAIR_MODE_CHANGED(p) || + strcmp(one->path, two->path)) + return 0; + + /* both are valid and point at the same path. that is, we are + * dealing with a change. + */ + if (one->sha1_valid && two->sha1_valid && + !hashcmp(one->sha1, two->sha1)) + return 1; /* no change */ + if (!one->sha1_valid && !two->sha1_valid) + return 1; /* both look at the same file on the filesystem. */ + return 0; +} + +static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* no tree diffs in patch format */ + + run_diff(p, o); +} + +static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o, + struct diffstat_t *diffstat) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* no tree diffs in patch format */ + + run_diffstat(p, o, diffstat); +} + +static void diff_flush_checkdiff(struct diff_filepair *p, + struct diff_options *o) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* no tree diffs in patch format */ + + run_checkdiff(p, o); +} + +int diff_queue_is_empty(void) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + for (i = 0; i < q->nr; i++) + if (!diff_unmodified_pair(q->queue[i])) + return 0; + return 1; +} + +#if DIFF_DEBUG +void diff_debug_filespec(struct diff_filespec *s, int x, const char *one) +{ + fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n", + x, one ? one : "", + s->path, + DIFF_FILE_VALID(s) ? "valid" : "invalid", + s->mode, + s->sha1_valid ? sha1_to_hex(s->sha1) : ""); + fprintf(stderr, "queue[%d] %s size %lu flags %d\n", + x, one ? one : "", + s->size, s->xfrm_flags); +} + +void diff_debug_filepair(const struct diff_filepair *p, int i) +{ + diff_debug_filespec(p->one, i, "one"); + diff_debug_filespec(p->two, i, "two"); + fprintf(stderr, "score %d, status %c rename_used %d broken %d\n", + p->score, p->status ? p->status : '?', + p->one->rename_used, p->broken_pair); +} + +void diff_debug_queue(const char *msg, struct diff_queue_struct *q) +{ + int i; + if (msg) + fprintf(stderr, "%s\n", msg); + fprintf(stderr, "q->nr = %d\n", q->nr); + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + diff_debug_filepair(p, i); + } +} +#endif + +static void diff_resolve_rename_copy(void) +{ + int i; + struct diff_filepair *p; + struct diff_queue_struct *q = &diff_queued_diff; + + diff_debug_queue("resolve-rename-copy", q); + + for (i = 0; i < q->nr; i++) { + p = q->queue[i]; + p->status = 0; /* undecided */ + if (DIFF_PAIR_UNMERGED(p)) + p->status = DIFF_STATUS_UNMERGED; + else if (!DIFF_FILE_VALID(p->one)) + p->status = DIFF_STATUS_ADDED; + else if (!DIFF_FILE_VALID(p->two)) + p->status = DIFF_STATUS_DELETED; + else if (DIFF_PAIR_TYPE_CHANGED(p)) + p->status = DIFF_STATUS_TYPE_CHANGED; + + /* from this point on, we are dealing with a pair + * whose both sides are valid and of the same type, i.e. + * either in-place edit or rename/copy edit. + */ + else if (DIFF_PAIR_RENAME(p)) { + /* + * A rename might have re-connected a broken + * pair up, causing the pathnames to be the + * same again. If so, that's not a rename at + * all, just a modification.. + * + * Otherwise, see if this source was used for + * multiple renames, in which case we decrement + * the count, and call it a copy. + */ + if (!strcmp(p->one->path, p->two->path)) + p->status = DIFF_STATUS_MODIFIED; + else if (--p->one->rename_used > 0) + p->status = DIFF_STATUS_COPIED; + else + p->status = DIFF_STATUS_RENAMED; + } + else if (hashcmp(p->one->sha1, p->two->sha1) || + p->one->mode != p->two->mode || + is_null_sha1(p->one->sha1)) + p->status = DIFF_STATUS_MODIFIED; + else { + /* This is a "no-change" entry and should not + * happen anymore, but prepare for broken callers. + */ + error("feeding unmodified %s to diffcore", + p->one->path); + p->status = DIFF_STATUS_UNKNOWN; + } + } + diff_debug_queue("resolve-rename-copy done", q); +} + +static int check_pair_status(struct diff_filepair *p) +{ + switch (p->status) { + case DIFF_STATUS_UNKNOWN: + return 0; + case 0: + die("internal error in diff-resolve-rename-copy"); + default: + return 1; + } +} + +static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt) +{ + int fmt = opt->output_format; + + if (fmt & DIFF_FORMAT_CHECKDIFF) + diff_flush_checkdiff(p, opt); + else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS)) + diff_flush_raw(p, opt); + else if (fmt & DIFF_FORMAT_NAME) + write_name_quoted(p->two->path, stdout, opt->line_termination); +} + +static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs) +{ + if (fs->mode) + printf(" %s mode %06o ", newdelete, fs->mode); + else + printf(" %s ", newdelete); + write_name_quoted(fs->path, stdout, '\n'); +} + + +static void show_mode_change(struct diff_filepair *p, int show_name) +{ + if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) { + printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode, + show_name ? ' ' : '\n'); + if (show_name) { + write_name_quoted(p->two->path, stdout, '\n'); + } + } +} + +static void show_rename_copy(const char *renamecopy, struct diff_filepair *p) +{ + char *names = pprint_rename(p->one->path, p->two->path); + + printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p)); + free(names); + show_mode_change(p, 0); +} + +static void diff_summary(struct diff_filepair *p) +{ + switch(p->status) { + case DIFF_STATUS_DELETED: + show_file_mode_name("delete", p->one); + break; + case DIFF_STATUS_ADDED: + show_file_mode_name("create", p->two); + break; + case DIFF_STATUS_COPIED: + show_rename_copy("copy", p); + break; + case DIFF_STATUS_RENAMED: + show_rename_copy("rename", p); + break; + default: + if (p->score) { + fputs(" rewrite ", stdout); + write_name_quoted(p->two->path, stdout, ' '); + printf("(%d%%)\n", similarity_index(p)); + } + show_mode_change(p, !p->score); + break; + } +} + +struct patch_id_t { + struct xdiff_emit_state xm; + SHA_CTX *ctx; + int patchlen; +}; + +static int remove_space(char *line, int len) +{ + int i; + char *dst = line; + unsigned char c; + + for (i = 0; i < len; i++) + if (!isspace((c = line[i]))) + *dst++ = c; + + return dst - line; +} + +static void patch_id_consume(void *priv, char *line, unsigned long len) +{ + struct patch_id_t *data = priv; + int new_len; + + /* Ignore line numbers when computing the SHA1 of the patch */ + if (!prefixcmp(line, "@@ -")) + return; + + new_len = remove_space(line, len); + + SHA1_Update(data->ctx, line, new_len); + data->patchlen += new_len; +} + +/* returns 0 upon success, and writes result into sha1 */ +static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + SHA_CTX ctx; + struct patch_id_t data; + char buffer[PATH_MAX * 4 + 20]; + + SHA1_Init(&ctx); + memset(&data, 0, sizeof(struct patch_id_t)); + data.ctx = &ctx; + data.xm.consume = patch_id_consume; + + for (i = 0; i < q->nr; i++) { + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + mmfile_t mf1, mf2; + struct diff_filepair *p = q->queue[i]; + int len1, len2; + + memset(&xecfg, 0, sizeof(xecfg)); + if (p->status == 0) + return error("internal diff status error"); + if (p->status == DIFF_STATUS_UNKNOWN) + continue; + if (diff_unmodified_pair(p)) + continue; + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + continue; + if (DIFF_PAIR_UNMERGED(p)) + continue; + + diff_fill_sha1_info(p->one); + diff_fill_sha1_info(p->two); + if (fill_mmfile(&mf1, p->one) < 0 || + fill_mmfile(&mf2, p->two) < 0) + return error("unable to read files to diff"); + + len1 = remove_space(p->one->path, strlen(p->one->path)); + len2 = remove_space(p->two->path, strlen(p->two->path)); + if (p->one->mode == 0) + len1 = snprintf(buffer, sizeof(buffer), + "diff--gita/%.*sb/%.*s" + "newfilemode%06o" + "---/dev/null" + "+++b/%.*s", + len1, p->one->path, + len2, p->two->path, + p->two->mode, + len2, p->two->path); + else if (p->two->mode == 0) + len1 = snprintf(buffer, sizeof(buffer), + "diff--gita/%.*sb/%.*s" + "deletedfilemode%06o" + "---a/%.*s" + "+++/dev/null", + len1, p->one->path, + len2, p->two->path, + p->one->mode, + len1, p->one->path); + else + len1 = snprintf(buffer, sizeof(buffer), + "diff--gita/%.*sb/%.*s" + "---a/%.*s" + "+++b/%.*s", + len1, p->one->path, + len2, p->two->path, + len1, p->one->path, + len2, p->two->path); + SHA1_Update(&ctx, buffer, len1); + + xpp.flags = XDF_NEED_MINIMAL; + xecfg.ctxlen = 3; + xecfg.flags = XDL_EMIT_FUNCNAMES; + ecb.outf = xdiff_outf; + ecb.priv = &data; + xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb); + } + + SHA1_Final(sha1, &ctx); + return 0; +} + +int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + int result = diff_get_patch_id(options, sha1); + + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); + + free(q->queue); + q->queue = NULL; + q->nr = q->alloc = 0; + + return result; +} + +static int is_summary_empty(const struct diff_queue_struct *q) +{ + int i; + + for (i = 0; i < q->nr; i++) { + const struct diff_filepair *p = q->queue[i]; + + switch (p->status) { + case DIFF_STATUS_DELETED: + case DIFF_STATUS_ADDED: + case DIFF_STATUS_COPIED: + case DIFF_STATUS_RENAMED: + return 0; + default: + if (p->score) + return 0; + if (p->one->mode && p->two->mode && + p->one->mode != p->two->mode) + return 0; + break; + } + } + return 1; +} + +void diff_flush(struct diff_options *options) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i, output_format = options->output_format; + int separator = 0; + + /* + * Order: raw, stat, summary, patch + * or: name/name-status/checkdiff (other bits clear) + */ + if (!q->nr) + goto free_queue; + + if (output_format & (DIFF_FORMAT_RAW | + DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF)) { + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + flush_one_pair(p, options); + } + separator++; + } + + if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) { + struct diffstat_t diffstat; + + memset(&diffstat, 0, sizeof(struct diffstat_t)); + diffstat.xm.consume = diffstat_consume; + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_stat(p, options, &diffstat); + } + if (output_format & DIFF_FORMAT_NUMSTAT) + show_numstat(&diffstat, options); + if (output_format & DIFF_FORMAT_DIFFSTAT) + show_stats(&diffstat, options); + if (output_format & DIFF_FORMAT_SHORTSTAT) + show_shortstats(&diffstat); + free_diffstat_info(&diffstat); + separator++; + } + + if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) { + for (i = 0; i < q->nr; i++) + diff_summary(q->queue[i]); + separator++; + } + + if (output_format & DIFF_FORMAT_PATCH) { + if (separator) { + if (options->stat_sep) { + /* attach patch instead of inline */ + fputs(options->stat_sep, stdout); + } else { + putchar(options->line_termination); + } + } + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_patch(p, options); + } + } + + if (output_format & DIFF_FORMAT_CALLBACK) + options->format_callback(q, options, options->format_callback_data); + + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); +free_queue: + free(q->queue); + q->queue = NULL; + q->nr = q->alloc = 0; +} + +static void diffcore_apply_filter(const char *filter) +{ + int i; + struct diff_queue_struct *q = &diff_queued_diff; + struct diff_queue_struct outq; + outq.queue = NULL; + outq.nr = outq.alloc = 0; + + if (!filter) + return; + + if (strchr(filter, DIFF_STATUS_FILTER_AON)) { + int found; + for (i = found = 0; !found && i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (((p->status == DIFF_STATUS_MODIFIED) && + ((p->score && + strchr(filter, DIFF_STATUS_FILTER_BROKEN)) || + (!p->score && + strchr(filter, DIFF_STATUS_MODIFIED)))) || + ((p->status != DIFF_STATUS_MODIFIED) && + strchr(filter, p->status))) + found++; + } + if (found) + return; + + /* otherwise we will clear the whole queue + * by copying the empty outq at the end of this + * function, but first clear the current entries + * in the queue. + */ + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); + } + else { + /* Only the matching ones */ + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + + if (((p->status == DIFF_STATUS_MODIFIED) && + ((p->score && + strchr(filter, DIFF_STATUS_FILTER_BROKEN)) || + (!p->score && + strchr(filter, DIFF_STATUS_MODIFIED)))) || + ((p->status != DIFF_STATUS_MODIFIED) && + strchr(filter, p->status))) + diff_q(&outq, p); + else + diff_free_filepair(p); + } + } + free(q->queue); + *q = outq; +} + +/* Check whether two filespecs with the same mode and size are identical */ +static int diff_filespec_is_identical(struct diff_filespec *one, + struct diff_filespec *two) +{ + if (S_ISGITLINK(one->mode)) { + diff_fill_sha1_info(one); + diff_fill_sha1_info(two); + return !hashcmp(one->sha1, two->sha1); + } + if (diff_populate_filespec(one, 0)) + return 0; + if (diff_populate_filespec(two, 0)) + return 0; + return !memcmp(one->data, two->data, one->size); +} + +static void diffcore_skip_stat_unmatch(struct diff_options *diffopt) +{ + int i; + struct diff_queue_struct *q = &diff_queued_diff; + struct diff_queue_struct outq; + outq.queue = NULL; + outq.nr = outq.alloc = 0; + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + + /* + * 1. Entries that come from stat info dirtyness + * always have both sides (iow, not create/delete), + * one side of the object name is unknown, with + * the same mode and size. Keep the ones that + * do not match these criteria. They have real + * differences. + * + * 2. At this point, the file is known to be modified, + * with the same mode and size, and the object + * name of one side is unknown. Need to inspect + * the identical contents. + */ + if (!DIFF_FILE_VALID(p->one) || /* (1) */ + !DIFF_FILE_VALID(p->two) || + (p->one->sha1_valid && p->two->sha1_valid) || + (p->one->mode != p->two->mode) || + diff_populate_filespec(p->one, 1) || + diff_populate_filespec(p->two, 1) || + (p->one->size != p->two->size) || + !diff_filespec_is_identical(p->one, p->two)) /* (2) */ + diff_q(&outq, p); + else { + /* + * The caller can subtract 1 from skip_stat_unmatch + * to determine how many paths were dirty only + * due to stat info mismatch. + */ + if (!DIFF_OPT_TST(diffopt, NO_INDEX)) + diffopt->skip_stat_unmatch++; + diff_free_filepair(p); + } + } + free(q->queue); + *q = outq; +} + +void diffcore_std(struct diff_options *options) +{ + if (DIFF_OPT_TST(options, QUIET)) + return; + + if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER)) + diffcore_skip_stat_unmatch(options); + if (options->break_opt != -1) + diffcore_break(options->break_opt); + if (options->detect_rename) + diffcore_rename(options); + if (options->break_opt != -1) + diffcore_merge_broken(); + if (options->pickaxe) + diffcore_pickaxe(options->pickaxe, options->pickaxe_opts); + if (options->orderfile) + diffcore_order(options->orderfile); + diff_resolve_rename_copy(); + diffcore_apply_filter(options->filter); + + if (diff_queued_diff.nr) + DIFF_OPT_SET(options, HAS_CHANGES); + else + DIFF_OPT_CLR(options, HAS_CHANGES); +} + +int diff_result_code(struct diff_options *opt, int status) +{ + int result = 0; + if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) && + !(opt->output_format & DIFF_FORMAT_CHECKDIFF)) + return status; + if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) && + DIFF_OPT_TST(opt, HAS_CHANGES)) + result |= 01; + if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) && + DIFF_OPT_TST(opt, CHECK_FAILED)) + result |= 02; + return result; +} + +void diff_addremove(struct diff_options *options, + int addremove, unsigned mode, + const unsigned char *sha1, + const char *base, const char *path) +{ + char concatpath[PATH_MAX]; + struct diff_filespec *one, *two; + + /* This may look odd, but it is a preparation for + * feeding "there are unchanged files which should + * not produce diffs, but when you are doing copy + * detection you would need them, so here they are" + * entries to the diff-core. They will be prefixed + * with something like '=' or '*' (I haven't decided + * which but should not make any difference). + * Feeding the same new and old to diff_change() + * also has the same effect. + * Before the final output happens, they are pruned after + * merged into rename/copy pairs as appropriate. + */ + if (DIFF_OPT_TST(options, REVERSE_DIFF)) + addremove = (addremove == '+' ? '-' : + addremove == '-' ? '+' : addremove); + + if (!path) path = ""; + sprintf(concatpath, "%s%s", base, path); + one = alloc_filespec(concatpath); + two = alloc_filespec(concatpath); + + if (addremove != '+') + fill_filespec(one, sha1, mode); + if (addremove != '-') + fill_filespec(two, sha1, mode); + + diff_queue(&diff_queued_diff, one, two); + DIFF_OPT_SET(options, HAS_CHANGES); +} + +void diff_change(struct diff_options *options, + unsigned old_mode, unsigned new_mode, + const unsigned char *old_sha1, + const unsigned char *new_sha1, + const char *base, const char *path) +{ + char concatpath[PATH_MAX]; + struct diff_filespec *one, *two; + + if (DIFF_OPT_TST(options, REVERSE_DIFF)) { + unsigned tmp; + const unsigned char *tmp_c; + tmp = old_mode; old_mode = new_mode; new_mode = tmp; + tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c; + } + if (!path) path = ""; + sprintf(concatpath, "%s%s", base, path); + one = alloc_filespec(concatpath); + two = alloc_filespec(concatpath); + fill_filespec(one, old_sha1, old_mode); + fill_filespec(two, new_sha1, new_mode); + + diff_queue(&diff_queued_diff, one, two); + DIFF_OPT_SET(options, HAS_CHANGES); +} + +void diff_unmerge(struct diff_options *options, + const char *path, + unsigned mode, const unsigned char *sha1) +{ + struct diff_filespec *one, *two; + one = alloc_filespec(path); + two = alloc_filespec(path); + fill_filespec(one, sha1, mode); + diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1; +} |