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68 lines
1.5 KiB
68 lines
1.5 KiB
#include "cache.h" |
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/* We allow "recursive" symbolic links. Only within reason, though. */ |
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#define MAXDEPTH 5 |
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const char *make_absolute_path(const char *path) |
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{ |
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static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1]; |
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char cwd[1024] = ""; |
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int buf_index = 1, len; |
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int depth = MAXDEPTH; |
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char *last_elem = NULL; |
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struct stat st; |
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if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) |
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die ("Too long path: %.*s", 60, path); |
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while (depth--) { |
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if (stat(buf, &st) || !S_ISDIR(st.st_mode)) { |
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char *last_slash = strrchr(buf, '/'); |
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if (last_slash) { |
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*last_slash = '\0'; |
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last_elem = xstrdup(last_slash + 1); |
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} else { |
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last_elem = xstrdup(buf); |
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*buf = '\0'; |
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} |
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} |
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if (*buf) { |
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if (!*cwd && !getcwd(cwd, sizeof(cwd))) |
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die ("Could not get current working directory"); |
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if (chdir(buf)) |
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die ("Could not switch to '%s'", buf); |
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} |
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if (!getcwd(buf, PATH_MAX)) |
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die ("Could not get current working directory"); |
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if (last_elem) { |
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int len = strlen(buf); |
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if (len + strlen(last_elem) + 2 > PATH_MAX) |
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die ("Too long path name: '%s/%s'", |
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buf, last_elem); |
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buf[len] = '/'; |
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strcpy(buf + len + 1, last_elem); |
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free(last_elem); |
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last_elem = NULL; |
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} |
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if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) { |
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len = readlink(buf, next_buf, PATH_MAX); |
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if (len < 0) |
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die ("Invalid symlink: %s", buf); |
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next_buf[len] = '\0'; |
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buf = next_buf; |
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buf_index = 1 - buf_index; |
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next_buf = bufs[buf_index]; |
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} else |
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break; |
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} |
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if (*cwd && chdir(cwd)) |
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die ("Could not change back to '%s'", cwd); |
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return buf; |
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}
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