The function strip_path_suffix() will try to split the given path into
prefix/suffix. The suffix has to be passed to the function, and if the
path matches, the prefix is set.
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@xxxxxx>
---
cache.h | 2 ++
path.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/cache.h b/cache.h
index 4e28c24..2186143 100644
--- a/cache.h
+++ b/cache.h
@@ -629,6 +629,8 @@ const char *make_nonrelative_path(const char *path);
const char *make_relative_path(const char *abs, const char *base);
int normalize_path_copy(char *dst, const char *src);
int longest_ancestor_length(const char *path, const char *prefix_list);
+int strip_path_suffix(const char *path, const char *suffix,
+ const char **prefix);
/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
extern int sha1_object_info(const unsigned char *, unsigned long *);
diff --git a/path.c b/path.c
index 4b9107f..947e5b7 100644
--- a/path.c
+++ b/path.c
@@ -499,3 +499,36 @@ 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;
+}
+
+/* sets prefix if the suffix matches */
+int strip_path_suffix(const char *path, const char *suffix, const char **prefix)
+{
+ int path_len = strlen(path), suffix_len = strlen(suffix);
+
+ while (suffix_len) {
+ if (!path_len)
+ return 1;
+
+ if (is_dir_sep(path[path_len - 1])) {
+ if (!is_dir_sep(suffix[suffix_len - 1]))
+ return 1;
+ 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 1;
+ }
+
+ if (path_len && !is_dir_sep(path[path_len - 1]))
+ return 1;
+ *prefix = xstrndup(path, chomp_trailing_dir_sep(path, path_len));
+ return 0;
+}
--
1.6.1.1.825.g72a9f
--
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