diff options
Diffstat (limited to 'libc/stdlib')
| -rw-r--r-- | libc/stdlib/realpath.c | 48 |
1 files changed, 26 insertions, 22 deletions
diff --git a/libc/stdlib/realpath.c b/libc/stdlib/realpath.c index 99afbde0c..e23c23c82 100644 --- a/libc/stdlib/realpath.c +++ b/libc/stdlib/realpath.c @@ -133,29 +133,33 @@ char got_path[]; path_len = strlen(path); /* See if last (so far) pathname component is a symlink. */ *new_path = '\0'; - link_len = readlink(got_path, copy_path, PATH_MAX - 1); - if (link_len < 0) { - /* EINVAL means the file exists but isn't a symlink. */ - if (errno != EINVAL) { - return NULL; - } - } else { - /* Safe sex check. */ - if (path_len + link_len >= PATH_MAX - 2) { - __set_errno(ENAMETOOLONG); - return NULL; + { + int sv_errno = errno; + link_len = readlink(got_path, copy_path, PATH_MAX - 1); + if (link_len < 0) { + /* EINVAL means the file exists but isn't a symlink. */ + if (errno != EINVAL) { + return NULL; + } + } else { + /* Safe sex check. */ + if (path_len + link_len >= PATH_MAX - 2) { + __set_errno(ENAMETOOLONG); + return NULL; + } + /* Note: readlink doesn't add the null byte. */ + /* copy_path[link_len] = '\0'; - we don't need it too */ + if (*copy_path == '/') + /* Start over for an absolute symlink. */ + new_path = got_path; + else + /* Otherwise back up over this component. */ + while (*(--new_path) != '/'); + /* Prepend symlink contents to path. */ + memmove(copy_path + (PATH_MAX-1) - link_len - path_len, copy_path, link_len); + path = copy_path + (PATH_MAX-1) - link_len - path_len; } - /* Note: readlink doesn't add the null byte. */ - /* copy_path[link_len] = '\0'; - we don't need it too */ - if (*copy_path == '/') - /* Start over for an absolute symlink. */ - new_path = got_path; - else - /* Otherwise back up over this component. */ - while (*(--new_path) != '/'); - /* Prepend symlink contents to path. */ - memmove(copy_path + (PATH_MAX-1) - link_len - path_len, copy_path, link_len); - path = copy_path + (PATH_MAX-1) - link_len - path_len; + __set_errno(sv_errno); } #endif /* S_IFLNK */ *new_path++ = '/'; |