Don't smash stack when $GIT_ALTERNATE_OBJECT_DIRECTORIES is too long

[git.git] / http-fetch.c

diff --git a/http-fetch.c b/http-fetch.c
index 9f790a08e5d2760524ab7a34e98071062b3ed42f..09baedc18ae320a2f09fa61d9065bedb69c02a41 100644 (file)
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -16,8 +16,7 @@ static struct curl_slist *no_pragma_header;
 
 struct alt_base
 {
-       const char *base;
-       int path_len;
+       char *base;
        int got_indices;
        struct packed_git *packs;
        struct alt_base *next;
@@ -158,12 +157,12 @@ static void start_object_request(struct object_request *obj_req)
 
        SHA1_Init(&obj_req->c);
 
-       url = xmalloc(strlen(obj_req->repo->base) + 50);
-       obj_req->url = xmalloc(strlen(obj_req->repo->base) + 50);
+       url = xmalloc(strlen(obj_req->repo->base) + 51);
+       obj_req->url = xmalloc(strlen(obj_req->repo->base) + 51);
        strcpy(url, obj_req->repo->base);
        posn = url + strlen(obj_req->repo->base);
-       strcpy(posn, "objects/");
-       posn += 8;
+       strcpy(posn, "/objects/");
+       posn += 9;
        memcpy(posn, hex, 2);
        posn += 2;
        *(posn++) = '/';
@@ -199,7 +198,7 @@ static void start_object_request(struct object_request *obj_req)
                SHA1_Init(&obj_req->c);
                if (prev_posn>0) {
                        prev_posn = 0;
-                       lseek(obj_req->local, SEEK_SET, 0);
+                       lseek(obj_req->local, 0, SEEK_SET);
                        ftruncate(obj_req->local, 0);
                }
        }
@@ -515,7 +514,6 @@ static void process_alternates_response(void *callback_data)
                        int serverlen = 0;
                        struct alt_base *newalt;
                        char *target = NULL;
-                       char *path;
                        if (data[i] == '/') {
                                /* This counts
                                 * http://git.host/pub/scm/linux.git/
@@ -583,12 +581,6 @@ static void process_alternates_response(void *callback_data)
                                newalt->base = target;
                                newalt->got_indices = 0;
                                newalt->packs = NULL;
-                               path = strstr(target, "//");
-                               if (path) {
-                                       path = strchr(path+2, '/');
-                                       if (path)
-                                               newalt->path_len = strlen(path);
-                               }
 
                                while (tail->next != NULL)
                                        tail = tail->next;
@@ -717,8 +709,8 @@ static int fetch_indices(struct alt_base *repo)
                case 'P':
                        i++;
                        if (i + 52 <= buffer.posn &&
-                           !strncmp(data + i, " pack-", 6) &&
-                           !strncmp(data + i + 46, ".pack\n", 6)) {
+                           !prefixcmp(data + i, " pack-") &&
+                           !prefixcmp(data + i + 46, ".pack\n")) {
                                get_sha1_hex(data + i + 6, sha1);
                                setup_index(repo, sha1);
                                i += 51;
@@ -938,14 +930,14 @@ static char *quote_ref_url(const char *base, const char *ref)
        int len, baselen, ch;
 
        baselen = strlen(base);
-       len = baselen + 6; /* "refs/" + NUL */
+       len = baselen + 7; /* "/refs/" + NUL */
        for (cp = ref; (ch = *cp) != 0; cp++, len++)
                if (needs_quote(ch))
                        len += 2; /* extra two hex plus replacement % */
        qref = xmalloc(len);
        memcpy(qref, base, baselen);
-       memcpy(qref + baselen, "refs/", 5);
-       for (cp = ref, dp = qref + baselen + 5; (ch = *cp) != 0; cp++) {
+       memcpy(qref + baselen, "/refs/", 6);
+       for (cp = ref, dp = qref + baselen + 6; (ch = *cp) != 0; cp++) {
                if (needs_quote(ch)) {
                        *dp++ = '%';
                        *dp++ = hex((ch >> 4) & 0xF);
@@ -999,7 +991,7 @@ int main(int argc, const char **argv)
        const char **write_ref = NULL;
        char **commit_id;
        const char *url;
-       char *path;
+       char *s;
        int arg = 1;
        int rc = 0;
 
@@ -1044,16 +1036,13 @@ int main(int argc, const char **argv)
        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 
        alt = xmalloc(sizeof(*alt));
-       alt->base = url;
+       alt->base = xmalloc(strlen(url) + 1);
+       strcpy(alt->base, url);
+       for (s = alt->base + strlen(alt->base) - 1; *s == '/'; --s)
+               *s = 0;
        alt->got_indices = 0;
        alt->packs = NULL;
        alt->next = NULL;
-       path = strstr(url, "//");
-       if (path) {
-               path = strchr(path+2, '/');
-               if (path)
-                       alt->path_len = strlen(path);
-       }
 
        if (pull(commits, commit_id, write_ref, url))
                rc = 1;