69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
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#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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