log-tree.c: cleanup a bit append_signoff()

This patch clean up append_signoff() by moving specific code that
looks up for "^[-A-Za-z]+: [^@]+@" pattern into a function.

It also stops the primary search when the cursor oversteps
'buf + at' limit.

This patch changes slightly append_signoff() behaviour too. If we
detect any Signed-off-by pattern during the primary search, we
needn't to do a pattern research after.

Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/log-tree.c b/log-tree.c
index 54cdaa4d81db3acc1150a558dc244f2a88b5cdbc..fbe139920ab0eada09dc921c152236d9676da44c 100644 (file)
--- a/log-tree.c
+++ b/log-tree.c
@@ -12,10 +12,58 @@ static void show_parents(struct commit *commit, int abbrev)
        }
 }
 
+/*
+ * Search for "^[-A-Za-z]+: [^@]+@" pattern. It usually matches
+ * Signed-off-by: and Acked-by: lines.
+ */
+static int detect_any_signoff(char *letter, int size)
+{
+       char ch, *cp;
+       int seen_colon = 0;
+       int seen_at = 0;
+       int seen_name = 0;
+       int seen_head = 0;
+
+       cp = letter + size;
+       while (letter <= --cp && (ch = *cp) == '\n')
+               continue;
+
+       while (letter <= cp) {
+               ch = *cp--;
+               if (ch == '\n')
+                       break;
+
+               if (!seen_at) {
+                       if (ch == '@')
+                               seen_at = 1;
+                       continue;
+               }
+               if (!seen_colon) {
+                       if (ch == '@')
+                               return 0;
+                       else if (ch == ':')
+                               seen_colon = 1;
+                       else
+                               seen_name = 1;
+                       continue;
+               }
+               if (('A' <= ch && ch <= 'Z') ||
+                   ('a' <= ch && ch <= 'z') ||
+                   ch == '-') {
+                       seen_head = 1;
+                       continue;
+               }
+               /* no empty last line doesn't match */
+               return 0;
+       }
+       return seen_head && seen_name;
+}
+
 static int append_signoff(char *buf, int buf_sz, int at, const char *signoff)
 {
-       int signoff_len = strlen(signoff);
        static const char signed_off_by[] = "Signed-off-by: ";
+       int signoff_len = strlen(signoff);
+       int has_signoff = 0;
        char *cp = buf;
 
        /* Do we have enough space to add it? */
@@ -23,58 +71,26 @@ static int append_signoff(char *buf, int buf_sz, int at, const char *signoff)
                return at;
 
        /* First see if we already have the sign-off by the signer */
-       while (1) {
-               cp = strstr(cp, signed_off_by);
-               if (!cp)
-                       break;
+       while ((cp = strstr(cp, signed_off_by))) {
+
+               has_signoff = 1;
+
                cp += strlen(signed_off_by);
-               if ((cp + signoff_len < buf + at) &&
-                   !strncmp(cp, signoff, signoff_len) &&
-                   isspace(cp[signoff_len]))
-                       return at; /* we already have him */
+               if (cp + signoff_len >= buf + at)
+                       break;
+               if (strncmp(cp, signoff, signoff_len))
+                       continue;
+               if (!isspace(cp[signoff_len]))
+                       continue;
+               /* we already have him */
+               return at;
        }
 
-       /* Does the last line already end with "^[-A-Za-z]+: [^@]+@"?
-        * If not, add a blank line to separate the message from
-        * the run of Signed-off-by: and Acked-by: lines.
-        */
-       {
-               char ch;
-               int seen_colon, seen_at, seen_name, seen_head, not_signoff;
-               seen_colon = 0;
-               seen_at = 0;
-               seen_name = 0;
-               seen_head = 0;
-               not_signoff = 0;
-               cp = buf + at;
-               while (buf <= --cp && (ch = *cp) == '\n')
-                       ;
-               while (!not_signoff && buf <= cp && (ch = *cp--) != '\n') {
-                       if (!seen_at) {
-                               if (ch == '@')
-                                       seen_at = 1;
-                               continue;
-                       }
-                       if (!seen_colon) {
-                               if (ch == '@')
-                                       not_signoff = 1;
-                               else if (ch == ':')
-                                       seen_colon = 1;
-                               else
-                                       seen_name = 1;
-                               continue;
-                       }
-                       if (('A' <= ch && ch <= 'Z') ||
-                           ('a' <= ch && ch <= 'z') ||
-                           ch == '-') {
-                               seen_head = 1;
-                               continue;
-                       }
-                       not_signoff = 1;
-               }
-               if (not_signoff || !seen_head || !seen_name)
-                       buf[at++] = '\n';
-       }
+       if (!has_signoff)
+               has_signoff = detect_any_signoff(buf, at);
+
+       if (!has_signoff)
+               buf[at++] = '\n';
 
        strcpy(buf + at, signed_off_by);
        at += strlen(signed_off_by);