diff options
Diffstat (limited to 'src/shared/path-util.h')
| -rw-r--r-- | src/shared/path-util.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/shared/path-util.h b/src/shared/path-util.h index 5548ce4a94..4f45cfd2b7 100644 --- a/src/shared/path-util.h +++ b/src/shared/path-util.h @@ -73,3 +73,30 @@ int fsck_exists(const char *fstype); /* Same as PATH_FOREACH_PREFIX but also includes the specified path itself */ #define PATH_FOREACH_PREFIX_MORE(prefix, path) \ for (char *_slash = ({ path_kill_slashes(strcpy(prefix, path)); if (streq(prefix, "/")) prefix[0] = 0; strrchr(prefix, 0); }); _slash && ((*_slash = 0), true); _slash = strrchr((prefix), '/')) + +char *prefix_root(const char *root, const char *path); + +/* Similar to prefix_root(), but returns an alloca() buffer, or + * possibly a const pointer into the path parameter */ +#define prefix_roota(root, path) \ + ({ \ + const char* _path = (path), *_root = (root), *_ret; \ + char *_p, *_n; \ + size_t _l; \ + while (_path[0] == '/' && _path[1] == '/') \ + _path ++; \ + if (isempty(_root) || path_equal(_root, "/")) \ + _ret = _path; \ + else { \ + _l = strlen(_root) + 1 + strlen(_path) + 1; \ + _n = alloca(_l); \ + _p = stpcpy(_n, _root); \ + while (_p > _n && _p[-1] == '/') \ + _p--; \ + if (_path[0] != '/') \ + *(_p++) = '/'; \ + strcpy(_p, _path); \ + _ret = _n; \ + } \ + _ret; \ + }) |