diff options
Diffstat (limited to 'path.c')
| -rw-r--r-- | path.c | 183 |
1 files changed, 156 insertions, 27 deletions
@@ -5,13 +5,7 @@ #include "strbuf.h" #include "string-list.h" -#ifndef get_st_mode_bits -/* - * The replacement lstat(2) we use on Cygwin is incomplete and - * may return wrong permission bits. Most of the time we do not care, - * but the callsites of this wrapper do care. - */ -int get_st_mode_bits(const char *path, int *mode) +static int get_st_mode_bits(const char *path, int *mode) { struct stat st; if (lstat(path, &st) < 0) @@ -19,7 +13,6 @@ int get_st_mode_bits(const char *path, int *mode) *mode = st.st_mode; return 0; } -#endif static char bad_path[] = "/bad-path/"; @@ -272,12 +265,12 @@ static struct passwd *getpw_str(const char *username, size_t len) char *expand_user_path(const char *path) { struct strbuf user_path = STRBUF_INIT; - const char *first_slash = strchrnul(path, '/'); const char *to_copy = path; if (path == NULL) goto return_null; if (path[0] == '~') { + const char *first_slash = strchrnul(path, '/'); const char *username = path + 1; size_t username_len = first_slash - username; if (username_len == 0) { @@ -441,41 +434,164 @@ int adjust_shared_perm(const char *path) return 0; } -const char *relative_path(const char *abs, const char *base) +static int have_same_root(const char *path1, const char *path2) +{ + int is_abs1, is_abs2; + + is_abs1 = is_absolute_path(path1); + is_abs2 = is_absolute_path(path2); + return (is_abs1 && is_abs2 && tolower(path1[0]) == tolower(path2[0])) || + (!is_abs1 && !is_abs2); +} + +/* + * Give path as relative to prefix. + * + * The strbuf may or may not be used, so do not assume it contains the + * returned path. + */ +const char *relative_path(const char *in, const char *prefix, + struct strbuf *sb) +{ + int in_len = in ? strlen(in) : 0; + int prefix_len = prefix ? strlen(prefix) : 0; + int in_off = 0; + int prefix_off = 0; + int i = 0, j = 0; + + if (!in_len) + return "./"; + else if (!prefix_len) + return in; + + if (have_same_root(in, prefix)) { + /* bypass dos_drive, for "c:" is identical to "C:" */ + if (has_dos_drive_prefix(in)) { + i = 2; + j = 2; + } + } else { + return in; + } + + while (i < prefix_len && j < in_len && prefix[i] == in[j]) { + if (is_dir_sep(prefix[i])) { + while (is_dir_sep(prefix[i])) + i++; + while (is_dir_sep(in[j])) + j++; + prefix_off = i; + in_off = j; + } else { + i++; + j++; + } + } + + if ( + /* "prefix" seems like prefix of "in" */ + i >= prefix_len && + /* + * but "/foo" is not a prefix of "/foobar" + * (i.e. prefix not end with '/') + */ + prefix_off < prefix_len) { + if (j >= in_len) { + /* in="/a/b", prefix="/a/b" */ + in_off = in_len; + } else if (is_dir_sep(in[j])) { + /* in="/a/b/c", prefix="/a/b" */ + while (is_dir_sep(in[j])) + j++; + in_off = j; + } else { + /* in="/a/bbb/c", prefix="/a/b" */ + i = prefix_off; + } + } else if ( + /* "in" is short than "prefix" */ + j >= in_len && + /* "in" not end with '/' */ + in_off < in_len) { + if (is_dir_sep(prefix[i])) { + /* in="/a/b", prefix="/a/b/c/" */ + while (is_dir_sep(prefix[i])) + i++; + in_off = in_len; + } + } + in += in_off; + in_len -= in_off; + + if (i >= prefix_len) { + if (!in_len) + return "./"; + else + return in; + } + + strbuf_reset(sb); + strbuf_grow(sb, in_len); + + while (i < prefix_len) { + if (is_dir_sep(prefix[i])) { + strbuf_addstr(sb, "../"); + while (is_dir_sep(prefix[i])) + i++; + continue; + } + i++; + } + if (!is_dir_sep(prefix[prefix_len - 1])) + strbuf_addstr(sb, "../"); + + strbuf_addstr(sb, in); + + return sb->buf; +} + +/* + * A simpler implementation of relative_path + * + * Get relative path by removing "prefix" from "in". This function + * first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter + * to increase performance when traversing the path to work_tree. + */ +const char *remove_leading_path(const char *in, const char *prefix) { static char buf[PATH_MAX + 1]; int i = 0, j = 0; - if (!base || !base[0]) - return abs; - while (base[i]) { - if (is_dir_sep(base[i])) { - if (!is_dir_sep(abs[j])) - return abs; - while (is_dir_sep(base[i])) + if (!prefix || !prefix[0]) + return in; + while (prefix[i]) { + if (is_dir_sep(prefix[i])) { + if (!is_dir_sep(in[j])) + return in; + while (is_dir_sep(prefix[i])) i++; - while (is_dir_sep(abs[j])) + while (is_dir_sep(in[j])) j++; continue; - } else if (abs[j] != base[i]) { - return abs; + } else if (in[j] != prefix[i]) { + return in; } i++; j++; } if ( /* "/foo" is a prefix of "/foo" */ - abs[j] && + in[j] && /* "/foo" is not a prefix of "/foobar" */ - !is_dir_sep(base[i-1]) && !is_dir_sep(abs[j]) + !is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j]) ) - return abs; - while (is_dir_sep(abs[j])) + return in; + while (is_dir_sep(in[j])) j++; - if (!abs[j]) + if (!in[j]) strcpy(buf, "."); else - strcpy(buf, abs + j); + strcpy(buf, in + j); return buf; } @@ -492,8 +608,14 @@ const char *relative_path(const char *abs, const char *base) * * Note that this function is purely textual. It does not follow symlinks, * verify the existence of the path, or make any system calls. + * + * prefix_len != NULL is for a specific case of prefix_pathspec(): + * assume that src == dst and src[0..prefix_len-1] is already + * normalized, any time "../" eats up to the prefix_len part, + * prefix_len is reduced. In the end prefix_len is the remaining + * prefix that has not been overridden by user pathspec. */ -int normalize_path_copy(char *dst, const char *src) +int normalize_path_copy_len(char *dst, const char *src, int *prefix_len) { char *dst0; @@ -568,11 +690,18 @@ int normalize_path_copy(char *dst, const char *src) /* Windows: dst[-1] cannot be backslash anymore */ while (dst0 < dst && dst[-1] != '/') dst--; + if (prefix_len && *prefix_len > dst - dst0) + *prefix_len = dst - dst0; } *dst = '\0'; return 0; } +int normalize_path_copy(char *dst, const char *src) +{ + return normalize_path_copy_len(dst, src, NULL); +} + /* * path = Canonical absolute path * prefixes = string_list containing normalized, absolute paths without |