Change parse_attr() to take a pointer to struct attr_state

parse_attr() only needs access to the attr_state to which it should
store its results, not to the whole match_attr structure.  This change
also removes the need for it to know num_attr.  Change its signature
accordingly and add a comment.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/attr.c b/attr.c
index cac550decd477525560423f6118c1aa2ca91e6d1..f23f62a6b13239e19284e207f2e8ec87431048dd 100644 (file)
--- a/attr.c
+++ b/attr.c
@@ -139,8 +139,15 @@ struct match_attr {
 
 static const char blank[] = " \t\r\n";
 
+/*
+ * Parse a whitespace-delimited attribute state (i.e., "attr",
+ * "-attr", "!attr", or "attr=value") from the string starting at src.
+ * If e is not NULL, write the results to *e.  Return a pointer to the
+ * remainder of the string (with leading whitespace removed), or NULL
+ * if there was an error.
+ */
 static const char *parse_attr(const char *src, int lineno, const char *cp,
-                             int num_attr, struct match_attr *res)
+                             struct attr_state *e)
 {
        const char *ep, *equals;
        int len;
@@ -153,7 +160,7 @@ static const char *parse_attr(const char *src, int lineno, const char *cp,
                len = equals - cp;
        else
                len = ep - cp;
-       if (!res) {
+       if (!e) {
                if (*cp == '-' || *cp == '!') {
                        cp++;
                        len--;
@@ -165,9 +172,6 @@ static const char *parse_attr(const char *src, int lineno, const char *cp,
                        return NULL;
                }
        } else {
-               struct attr_state *e;
-
-               e = &(res->state[num_attr]);
                if (*cp == '-' || *cp == '!') {
                        e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
                        cp++;
@@ -225,7 +229,8 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
                cp = name + namelen;
                cp = cp + strspn(cp, blank);
                while (*cp) {
-                       cp = parse_attr(src, lineno, cp, num_attr, res);
+                       cp = parse_attr(src, lineno, cp,
+                               pass ? &(res->state[num_attr]) : NULL);
                        if (!cp)
                                return NULL;
                        num_attr++;