diff options
Diffstat (limited to 'abspath.c')
| -rw-r--r-- | abspath.c | 66 |
1 files changed, 51 insertions, 15 deletions
@@ -1,23 +1,45 @@ #include "cache.h" +/* + * Do not use this for inspecting *tracked* content. When path is a + * symlink to a directory, we do not want to say it is a directory when + * dealing with tracked content in the working tree. + */ +int is_directory(const char *path) +{ + struct stat st; + return (!stat(path, &st) && S_ISDIR(st.st_mode)); +} + /* We allow "recursive" symbolic links. Only within reason, though. */ #define MAXDEPTH 5 -const char *make_absolute_path(const char *path) +/* + * Use this to get the real path, i.e. resolve links. If you want an + * absolute path but don't mind links, use absolute_path. + * + * If path is our buffer, then return path, as it's already what the + * user wants. + */ +const char *real_path(const char *path) { static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1]; char cwd[1024] = ""; - int buf_index = 1, len; + int buf_index = 1; int depth = MAXDEPTH; char *last_elem = NULL; struct stat st; + /* We've already done it */ + if (path == buf || path == next_buf) + return path; + if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) die ("Too long path: %.*s", 60, path); while (depth--) { - if (stat(buf, &st) || !S_ISDIR(st.st_mode)) { + if (!is_directory(buf)) { char *last_slash = strrchr(buf, '/'); if (last_slash) { *last_slash = '\0'; @@ -30,29 +52,32 @@ const char *make_absolute_path(const char *path) if (*buf) { if (!*cwd && !getcwd(cwd, sizeof(cwd))) - die ("Could not get current working directory"); + die_errno ("Could not get current working directory"); if (chdir(buf)) - die ("Could not switch to '%s'", buf); + die_errno ("Could not switch to '%s'", buf); } if (!getcwd(buf, PATH_MAX)) - die ("Could not get current working directory"); + die_errno ("Could not get current working directory"); if (last_elem) { - int len = strlen(buf); + size_t len = strlen(buf); if (len + strlen(last_elem) + 2 > PATH_MAX) die ("Too long path name: '%s/%s'", buf, last_elem); - buf[len] = '/'; - strcpy(buf + len + 1, last_elem); + if (len && buf[len-1] != '/') + buf[len++] = '/'; + strcpy(buf + len, last_elem); free(last_elem); last_elem = NULL; } if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) { - len = readlink(buf, next_buf, PATH_MAX); + ssize_t len = readlink(buf, next_buf, PATH_MAX); if (len < 0) - die ("Invalid symlink: %s", buf); + die_errno ("Invalid symlink '%s'", buf); + if (PATH_MAX <= len) + die("symbolic link too long: %s", buf); next_buf[len] = '\0'; buf = next_buf; buf_index = 1 - buf_index; @@ -62,7 +87,7 @@ const char *make_absolute_path(const char *path) } if (*cwd && chdir(cwd)) - die ("Could not change back to '%s'", cwd); + die_errno ("Could not change back to '%s'", cwd); return buf; } @@ -86,7 +111,14 @@ static const char *get_pwd_cwd(void) return cwd; } -const char *make_nonrelative_path(const char *path) +/* + * Use this to get an absolute path from a relative one. If you want + * to resolve links, you should use real_path. + * + * If the path is already absolute, then return path. As the user is + * never meant to free the return value, we're safe. + */ +const char *absolute_path(const char *path) { static char buf[PATH_MAX + 1]; @@ -94,10 +126,14 @@ const char *make_nonrelative_path(const char *path) if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) die("Too long path: %.*s", 60, path); } else { + size_t len; + const char *fmt; const char *cwd = get_pwd_cwd(); if (!cwd) - die("Cannot determine the current working directory"); - if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX) + die_errno("Cannot determine the current working directory"); + len = strlen(cwd); + fmt = (len > 0 && is_dir_sep(cwd[len-1])) ? "%s%s" : "%s/%s"; + if (snprintf(buf, PATH_MAX, fmt, cwd, path) >= PATH_MAX) die("Too long path: %.*s", 60, path); } return buf; |