refspec: factor out parsing a single refspec
[git/git.git] / refspec.c
index 22188f0..8bf4ebb 100644 (file)
--- a/refspec.c
+++ b/refspec.c
@@ -14,110 +14,123 @@ static struct refspec_item s_tag_refspec = {
 /* See TAG_REFSPEC for the string version */
 const struct refspec_item *tag_refspec = &s_tag_refspec;
 
-static struct refspec_item *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
+/*
+ * Parses the provided refspec 'refspec' and populates the refspec_item 'item'.
+ * Returns 1 if successful and 0 if the refspec is invalid.
+ */
+static int parse_refspec(struct refspec_item *item, const char *refspec, int fetch)
 {
-       int i;
-       struct refspec_item *rs = xcalloc(nr_refspec, sizeof(*rs));
+       size_t llen;
+       int is_glob;
+       const char *lhs, *rhs;
+       int flags;
 
-       for (i = 0; i < nr_refspec; i++) {
-               size_t llen;
-               int is_glob;
-               const char *lhs, *rhs;
-               int flags;
+       is_glob = 0;
 
-               is_glob = 0;
+       lhs = refspec;
+       if (*lhs == '+') {
+               item->force = 1;
+               lhs++;
+       }
 
-               lhs = refspec[i];
-               if (*lhs == '+') {
-                       rs[i].force = 1;
-                       lhs++;
-               }
+       rhs = strrchr(lhs, ':');
 
-               rhs = strrchr(lhs, ':');
+       /*
+        * Before going on, special case ":" (or "+:") as a refspec
+        * for pushing matching refs.
+        */
+       if (!fetch && rhs == lhs && rhs[1] == '\0') {
+               item->matching = 1;
+               return 1;
+       }
 
+       if (rhs) {
+               size_t rlen = strlen(++rhs);
+               is_glob = (1 <= rlen && strchr(rhs, '*'));
+               item->dst = xstrndup(rhs, rlen);
+       }
+
+       llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
+       if (1 <= llen && memchr(lhs, '*', llen)) {
+               if ((rhs && !is_glob) || (!rhs && fetch))
+                       return 0;
+               is_glob = 1;
+       } else if (rhs && is_glob) {
+               return 0;
+       }
+
+       item->pattern = is_glob;
+       item->src = xstrndup(lhs, llen);
+       flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
+
+       if (fetch) {
+               struct object_id unused;
+
+               /* LHS */
+               if (!*item->src)
+                       ; /* empty is ok; it means "HEAD" */
+               else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(item->src, &unused))
+                       item->exact_sha1 = 1; /* ok */
+               else if (!check_refname_format(item->src, flags))
+                       ; /* valid looking ref is ok */
+               else
+                       return 0;
+               /* RHS */
+               if (!item->dst)
+                       ; /* missing is ok; it is the same as empty */
+               else if (!*item->dst)
+                       ; /* empty is ok; it means "do not store" */
+               else if (!check_refname_format(item->dst, flags))
+                       ; /* valid looking ref is ok */
+               else
+                       return 0;
+       } else {
                /*
-                * Before going on, special case ":" (or "+:") as a refspec
-                * for pushing matching refs.
+                * LHS
+                * - empty is allowed; it means delete.
+                * - when wildcarded, it must be a valid looking ref.
+                * - otherwise, it must be an extended SHA-1, but
+                *   there is no existing way to validate this.
                 */
-               if (!fetch && rhs == lhs && rhs[1] == '\0') {
-                       rs[i].matching = 1;
-                       continue;
+               if (!*item->src)
+                       ; /* empty is ok */
+               else if (is_glob) {
+                       if (check_refname_format(item->src, flags))
+                               return 0;
                }
-
-               if (rhs) {
-                       size_t rlen = strlen(++rhs);
-                       is_glob = (1 <= rlen && strchr(rhs, '*'));
-                       rs[i].dst = xstrndup(rhs, rlen);
+               else
+                       ; /* anything goes, for now */
+               /*
+                * RHS
+                * - missing is allowed, but LHS then must be a
+                *   valid looking ref.
+                * - empty is not allowed.
+                * - otherwise it must be a valid looking ref.
+                */
+               if (!item->dst) {
+                       if (check_refname_format(item->src, flags))
+                               return 0;
+               } else if (!*item->dst) {
+                       return 0;
+               } else {
+                       if (check_refname_format(item->dst, flags))
+                               return 0;
                }
+       }
 
-               llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
-               if (1 <= llen && memchr(lhs, '*', llen)) {
-                       if ((rhs && !is_glob) || (!rhs && fetch))
-                               goto invalid;
-                       is_glob = 1;
-               } else if (rhs && is_glob) {
-                       goto invalid;
-               }
+       return 1;
+}
 
-               rs[i].pattern = is_glob;
-               rs[i].src = xstrndup(lhs, llen);
-               flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
-
-               if (fetch) {
-                       struct object_id unused;
-
-                       /* LHS */
-                       if (!*rs[i].src)
-                               ; /* empty is ok; it means "HEAD" */
-                       else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
-                               rs[i].exact_sha1 = 1; /* ok */
-                       else if (!check_refname_format(rs[i].src, flags))
-                               ; /* valid looking ref is ok */
-                       else
-                               goto invalid;
-                       /* RHS */
-                       if (!rs[i].dst)
-                               ; /* missing is ok; it is the same as empty */
-                       else if (!*rs[i].dst)
-                               ; /* empty is ok; it means "do not store" */
-                       else if (!check_refname_format(rs[i].dst, flags))
-                               ; /* valid looking ref is ok */
-                       else
-                               goto invalid;
-               } else {
-                       /*
-                        * LHS
-                        * - empty is allowed; it means delete.
-                        * - when wildcarded, it must be a valid looking ref.
-                        * - otherwise, it must be an extended SHA-1, but
-                        *   there is no existing way to validate this.
-                        */
-                       if (!*rs[i].src)
-                               ; /* empty is ok */
-                       else if (is_glob) {
-                               if (check_refname_format(rs[i].src, flags))
-                                       goto invalid;
-                       }
-                       else
-                               ; /* anything goes, for now */
-                       /*
-                        * RHS
-                        * - missing is allowed, but LHS then must be a
-                        *   valid looking ref.
-                        * - empty is not allowed.
-                        * - otherwise it must be a valid looking ref.
-                        */
-                       if (!rs[i].dst) {
-                               if (check_refname_format(rs[i].src, flags))
-                                       goto invalid;
-                       } else if (!*rs[i].dst) {
-                               goto invalid;
-                       } else {
-                               if (check_refname_format(rs[i].dst, flags))
-                                       goto invalid;
-                       }
-               }
+static struct refspec_item *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
+{
+       int i;
+       struct refspec_item *rs = xcalloc(nr_refspec, sizeof(*rs));
+
+       for (i = 0; i < nr_refspec; i++) {
+               if (!parse_refspec(&rs[i], refspec[i], fetch))
+                       goto invalid;
        }
+
        return rs;
 
  invalid: