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>
This commit is contained in:
Johannes Schindelin 2009-02-19 20:10:49 +01:00 коммит произвёл Junio C Hamano
Родитель 25487f8e2a
Коммит 4fcc86b07d
4 изменённых файлов: 47 добавлений и 0 удалений

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@ -626,6 +626,7 @@ 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);
char *strip_path_suffix(const char *path, const char *suffix);
/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
extern int sha1_object_info(const unsigned char *, unsigned long *);

36
path.c
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@ -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));
}

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@ -85,4 +85,8 @@ ancestor /foo/bar :://foo/.:: 4
ancestor /foo/bar //foo/./::/bar 4
ancestor /foo/bar ::/bar -1
test_expect_success 'strip_path_suffix' '
test c:/msysgit = $(test-path-utils strip_path_suffix \
c:/msysgit/libexec//git-core libexec/git-core)
'
test_done

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@ -26,6 +26,12 @@ int main(int argc, char **argv)
return 0;
}
if (argc == 4 && !strcmp(argv[1], "strip_path_suffix")) {
char *prefix = strip_path_suffix(argv[2], argv[3]);
printf("%s\n", prefix ? prefix : "(null)");
return 0;
}
fprintf(stderr, "%s: unknown function name: %s\n", argv[0],
argv[1] ? argv[1] : "(there was none)");
return 1;