[PATCH 1/6] attr.c::path_matches(): the basename is part of the pathname

[Jeff King]

From: Junio C Hamano <gits...@pobox.com>

The function takes two strings (pathname and basename) as if they
are independent strings, but in reality, the latter is always
pointing into a substring in the former.

Clarify this relationship by expressing the latter as an offset into
the former.

Signed-off-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: Jeff King <p...@peff.net>
---
This is identical to the original 1/4.

 attr.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/attr.c b/attr.c
index ab2aab2..4cfe0ee 100644
--- a/attr.c
+++ b/attr.c
@@ -655,7 +655,7 @@ static int path_matches(const char *pathname, int pathlen,
 }
 
 static int path_matches(const char *pathname, int pathlen,
-                       const char *basename,
+                       int basename_offset,
                        const struct pattern *pat,
                        const char *base, int baselen)
 {
@@ -667,8 +667,8 @@ static int path_matches(const char *pathname, int pathlen,
                return 0;
 
        if (pat->flags & EXC_FLAG_NODIR) {
-               return match_basename(basename,
-                                     pathlen - (basename - pathname),
+               return match_basename(pathname + basename_offset,
+                                     pathlen - basename_offset,
                                      pattern, prefix,
                                      pat->patternlen, pat->flags);
        }
@@ -701,7 +701,7 @@ static int fill_one(const char *what, struct match_attr *a, 
int rem)
        return rem;
 }
 
-static int fill(const char *path, int pathlen, const char *basename,
+static int fill(const char *path, int pathlen, int basename_offset,
                struct attr_stack *stk, int rem)
 {
        int i;
@@ -711,7 +711,7 @@ static int fill(const char *path, int pathlen, const char 
*basename,
                struct match_attr *a = stk->attrs[i];
                if (a->is_macro)
                        continue;
-               if (path_matches(path, pathlen, basename,
+               if (path_matches(path, pathlen, basename_offset,
                                 &a->u.pat, base, stk->originlen))
                        rem = fill_one("fill", a, rem);
        }
@@ -750,7 +750,8 @@ static void collect_all_attrs(const char *path)
 {
        struct attr_stack *stk;
        int i, pathlen, rem, dirlen;
-       const char *basename, *cp, *last_slash = NULL;
+       const char *cp, *last_slash = NULL;
+       int basename_offset;
 
        for (cp = path; *cp; cp++) {
                if (*cp == '/' && cp[1])
@@ -758,10 +759,10 @@ static void collect_all_attrs(const char *path)
        }
        pathlen = cp - path;
        if (last_slash) {
-               basename = last_slash + 1;
+               basename_offset = last_slash + 1 - path;
                dirlen = last_slash - path;
        } else {
-               basename = path;
+               basename_offset = 0;
                dirlen = 0;
        }
 
@@ -771,7 +772,7 @@ static void collect_all_attrs(const char *path)
 
        rem = attr_nr;
        for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
-               rem = fill(path, pathlen, basename, stk, rem);
+               rem = fill(path, pathlen, basename_offset, stk, rem);
 }
 
 int git_check_attr(const char *path, int num, struct git_attr_check *check)
-- 
1.8.2.13.g0f18d3c

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