parse_feature_request: make it easier to see feature values

We already take care to parse key/value capabilities like
"foo=bar", but the code does not provide a good way of
actually finding out what is on the right-hand side of the
"=".

A server using "parse_feature_request" could accomplish this
with some extra parsing. You must skip past the "key"
portion manually, check for "=" versus NUL or space, and
then find the length by searching for the next space (or
NUL).  But clients can't even do that, since the
"server_supports" interface does not even return the
pointer.

Instead, let's have our parser share more information by
providing a pointer to the value and its length. The
"parse_feature_value" function returns a pointer to the
feature's value portion, along with the length of the value.
If the feature is missing, NULL is returned. If it does not
have an "=", then a zero-length value is returned.

Similarly, "server_feature_value" behaves in the same way,
but always checks the static server_feature_list variable.

We can then implement "server_supports" in terms of
"server_feature_value". We cannot implement the original
"parse_feature_request" in terms of our new function,
because it returned a pointer to the beginning of the
feature. However, no callers actually cared about the value
of the returned pointer, so we can simplify it to a boolean
just as we do for "server_supports".

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/cache.h b/cache.h
index 06413e1584dc762063feaa3728209a4d2864ebc7..b71b0650f4ba7eb6b588c24cbf7d30661e96d9fb 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1030,7 +1030,9 @@ struct extra_have_objects {
 };
 extern struct ref **get_remote_heads(int in, struct ref **list, unsigned int flags, struct extra_have_objects *);
 extern int server_supports(const char *feature);
-extern const char *parse_feature_request(const char *features, const char *feature);
+extern int parse_feature_request(const char *features, const char *feature);
+extern const char *server_feature_value(const char *feature, int *len_ret);
+extern const char *parse_feature_value(const char *feature_list, const char *feature, int *len_ret);
 
 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
 

diff --git a/connect.c b/connect.c
index 912cddeea8c4f09ec523ce19e677358c84eda9b7..9aec10cec11233405b1d5b1cfb15030dcbcc0ce5 100644 (file)
--- a/connect.c
+++ b/connect.c
@@ -99,12 +99,7 @@ struct ref **get_remote_heads(int in, struct ref **list,
        return list;
 }
 
-int server_supports(const char *feature)
-{
-       return !!parse_feature_request(server_capabilities, feature);
-}
-
-const char *parse_feature_request(const char *feature_list, const char *feature)
+const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
 {
        int len;
 
@@ -116,14 +111,46 @@ const char *parse_feature_request(const char *feature_list, const char *feature)
                const char *found = strstr(feature_list, feature);
                if (!found)
                        return NULL;
-               if ((feature_list == found || isspace(found[-1])) &&
-                   (!found[len] || isspace(found[len]) || found[len] == '='))
-                       return found;
+               if (feature_list == found || isspace(found[-1])) {
+                       const char *value = found + len;
+                       /* feature with no value (e.g., "thin-pack") */
+                       if (!*value || isspace(*value)) {
+                               if (lenp)
+                                       *lenp = 0;
+                               return value;
+                       }
+                       /* feature with a value (e.g., "agent=git/1.2.3") */
+                       else if (*value == '=') {
+                               value++;
+                               if (lenp)
+                                       *lenp = strcspn(value, " \t\n");
+                               return value;
+                       }
+                       /*
+                        * otherwise we matched a substring of another feature;
+                        * keep looking
+                        */
+               }
                feature_list = found + 1;
        }
        return NULL;
 }
 
+int parse_feature_request(const char *feature_list, const char *feature)
+{
+       return !!parse_feature_value(feature_list, feature, NULL);
+}
+
+const char *server_feature_value(const char *feature, int *len)
+{
+       return parse_feature_value(server_capabilities, feature, len);
+}
+
+int server_supports(const char *feature)
+{
+       return !!server_feature_value(feature, NULL);
+}
+
 enum protocol {
        PROTO_LOCAL = 1,
        PROTO_SSH,