grep: factor out do_append_grep_pat()

Add do_append_grep_pat() as a shared function for adding patterns to
the header pattern list and the general pattern list.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/grep.c b/grep.c
index 2b77c477643b825cb2ea46a0bfbddd2da32b8bea..c35a7ce57d323fdc1e64fdcc33f90cf977e62342 100644 (file)
--- a/grep.c
+++ b/grep.c
@@ -18,14 +18,19 @@ static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
        return p;
 }
 
+static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
+{
+       **tail = p;
+       *tail = &p->next;
+       p->next = NULL;
+}
+
 void append_header_grep_pattern(struct grep_opt *opt,
                                enum grep_header_field field, const char *pat)
 {
        struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
                                             GREP_PATTERN_HEAD, field);
-       *opt->header_tail = p;
-       opt->header_tail = &p->next;
-       p->next = NULL;
+       do_append_grep_pat(&opt->header_tail, p);
 }
 
 void append_grep_pattern(struct grep_opt *opt, const char *pat,
@@ -38,9 +43,7 @@ void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
                     const char *origin, int no, enum grep_pat_token t)
 {
        struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
-       *opt->pattern_tail = p;
-       opt->pattern_tail = &p->next;
-       p->next = NULL;
+       do_append_grep_pat(&opt->pattern_tail, p);
 }
 
 struct grep_opt *grep_opt_dup(const struct grep_opt *opt)