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authorJohannes Schindelin <johannes.schindelin@gmx.de>2009-02-19 19:10:49 (GMT)
committerJunio C Hamano <gitster@pobox.com>2009-02-20 06:45:48 (GMT)
commit4fcc86b07db26da17f17af0fd777cab78fcaaf4c (patch)
tree078378b5ea1dcae57f9a2602c71370cb1a962c74 /path.c
parent25487f8e2ae266936df0f807ae79dca41606e404 (diff)
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Introduce the function strip_path_suffix()
The function strip_path_suffix() will try to strip a given suffix from a given path. The suffix must start at a directory boundary (i.e. "core" is not a path suffix of "libexec/git-core", but "git-core" is). Arbitrary runs of directory separators ("slashes") are assumed identical. Example: strip_path_suffix("C:\\msysgit/\\libexec\\git-core", "libexec///git-core", &prefix) will set prefix to "C:\\msysgit" and return 0. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'path.c')
-rw-r--r--path.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/path.c b/path.c
index 4b9107f..e332b50 100644
--- a/path.c
+++ b/path.c
@@ -499,3 +499,39 @@ int longest_ancestor_length(const char *path, const char *prefix_list)
return max_len;
}
+
+/* strip arbitrary amount of directory separators at end of path */
+static inline int chomp_trailing_dir_sep(const char *path, int len)
+{
+ while (len && is_dir_sep(path[len - 1]))
+ len--;
+ return len;
+}
+
+/*
+ * If path ends with suffix (complete path components), returns the
+ * part before suffix (sans trailing directory separators).
+ * Otherwise returns NULL.
+ */
+char *strip_path_suffix(const char *path, const char *suffix)
+{
+ int path_len = strlen(path), suffix_len = strlen(suffix);
+
+ while (suffix_len) {
+ if (!path_len)
+ return NULL;
+
+ if (is_dir_sep(path[path_len - 1])) {
+ if (!is_dir_sep(suffix[suffix_len - 1]))
+ return NULL;
+ path_len = chomp_trailing_dir_sep(path, path_len);
+ suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
+ }
+ else if (path[--path_len] != suffix[--suffix_len])
+ return NULL;
+ }
+
+ if (path_len && !is_dir_sep(path[path_len - 1]))
+ return NULL;
+ return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
+}