From 288123f01cb1b835edbf6e2e188159c2ff858aca Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Thu, 21 Jan 2010 19:05:19 -0800 Subject: ignore duplicated slashes in make_relative_path() The function takes two paths, an early part of abs is supposed to match base; otherwise abs is not a path under base and the function returns the full path of abs. The caller can easily confuse the implementation by giving duplicated and needless slashes in these path arguments. Credit for test script, motivation and initial patch goes to Thomas Rast. A follow-up fix (squashed) is by Hannes. Signed-off-by: Junio C Hamano --- path.c | 39 ++++++++++++++++++++++++++++++--------- 1 file changed, 30 insertions(+), 9 deletions(-) (limited to 'path.c') diff --git a/path.c b/path.c index 2ec950b27f..79aa104712 100644 --- a/path.c +++ b/path.c @@ -394,17 +394,38 @@ int set_shared_perm(const char *path, int mode) const char *make_relative_path(const char *abs, const char *base) { static char buf[PATH_MAX + 1]; - int baselen; - if (!base) - return abs; - baselen = strlen(base); - if (prefixcmp(abs, base)) + int i = 0, j = 0; + + if (!base || !base[0]) return abs; - if (abs[baselen] == '/') - baselen++; - else if (base[baselen - 1] != '/') + while (base[i]) { + if (is_dir_sep(base[i])) { + if (!is_dir_sep(abs[j])) + return abs; + while (is_dir_sep(base[i])) + i++; + while (is_dir_sep(abs[j])) + j++; + continue; + } else if (abs[j] != base[i]) { + return abs; + } + i++; + j++; + } + if ( + /* "/foo" is a prefix of "/foo" */ + abs[j] && + /* "/foo" is not a prefix of "/foobar" */ + !is_dir_sep(base[i-1]) && !is_dir_sep(abs[j]) + ) return abs; - strcpy(buf, abs + baselen); + while (is_dir_sep(abs[j])) + j++; + if (!abs[j]) + strcpy(buf, "."); + else + strcpy(buf, abs + j); return buf; } -- cgit v1.2.3