use xstrfmt to replace xmalloc + sprintf

This is one line shorter, and makes sure the length in the
malloc and sprintf steps match.

These conversions are very straightforward; we can drop the
malloc entirely, and replace the sprintf with xstrfmt.

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

builtin/fmt-merge-msg.c

@@ -178,11 +178,8 @@ static int handle_line(char *line, struct merge_parents *merge_parents)
 		int len = strlen(origin);
 		if (origin[0] == '\'' && origin[len - 1] == '\'')
 			origin = xmemdupz(origin + 1, len - 2);
-	} else {
+	} else
-		char *new_origin = xmalloc(strlen(origin) + strlen(src) + 5);
+		origin = xstrfmt("%s of %s", origin, src);
-		sprintf(new_origin, "%s of %s", origin, src);
-		origin = new_origin;
-	}
 	if (strcmp(".", src))
 		origin_data->is_local_branch = 0;
 	string_list_append(&origins, origin)->util = origin_data;

builtin/show-branch.c

@@ -755,7 +755,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 		}
 
 		for (i = 0; i < reflog; i++) {
-			char *logmsg, *m;
+			char *logmsg;
 			const char *msg;
 			unsigned long timestamp;
 			int tz;
@@ -770,11 +770,9 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 				msg = "(none)";
 			else
 				msg++;
-			m = xmalloc(strlen(msg) + 200);
+			reflog_msg[i] = xstrfmt("(%s) %s",
-			sprintf(m, "(%s) %s",
+						show_date(timestamp, tz, 1),
-				show_date(timestamp, tz, 1),
+						msg);
-				msg);
-			reflog_msg[i] = m;
 			free(logmsg);
 			sprintf(nth_desc, "%s@{%d}", *av, base+i);
 			append_ref(nth_desc, sha1, 1);

http-push.c

@@ -854,8 +854,7 @@ static struct remote_lock *lock_remote(const char *path, long timeout)
 	struct xml_ctx ctx;
 	char *escaped;
 
-	url = xmalloc(strlen(repo->url) + strlen(path) + 1);
+	url = xstrfmt("%s%s", repo->url, path);
-	sprintf(url, "%s%s", repo->url, path);
 
 	/* Make sure leading directories exist for the remote ref */
 	ep = strchr(url + strlen(repo->url) + 1, '/');
@@ -1115,7 +1114,7 @@ static void remote_ls(const char *path, int flags,
 		      void (*userFunc)(struct remote_ls_ctx *ls),
 		      void *userData)
 {
-	char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
+	char *url = xstrfmt("%s%s", repo->url, path);
 	struct active_request_slot *slot;
 	struct slot_results results;
 	struct strbuf in_buffer = STRBUF_INIT;
@@ -1131,8 +1130,6 @@ static void remote_ls(const char *path, int flags,
 	ls.userData = userData;
 	ls.userFunc = userFunc;
 
-	sprintf(url, "%s%s", repo->url, path);
-
 	strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
 
 	dav_headers = curl_slist_append(dav_headers, "Depth: 1");
@@ -1534,10 +1531,9 @@ static void update_remote_info_refs(struct remote_lock *lock)
 
 static int remote_exists(const char *path)
 {
-	char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
+	char *url = xstrfmt("%s%s", repo->url, path);
 	int ret;
 
-	sprintf(url, "%s%s", repo->url, path);
 
 	switch (http_get_strbuf(url, NULL, NULL)) {
 	case HTTP_OK:
@@ -1557,12 +1553,9 @@ static int remote_exists(const char *path)
 
 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
 {
-	char *url;
+	char *url = xstrfmt("%s%s", repo->url, path);
 	struct strbuf buffer = STRBUF_INIT;
 
-	url = xmalloc(strlen(repo->url) + strlen(path) + 1);
-	sprintf(url, "%s%s", repo->url, path);
-
 	if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
 		die("Couldn't get %s for remote symref\n%s", url,
 		    curl_errorstr);
@@ -1671,8 +1664,7 @@ static int delete_remote_branch(const char *pattern, int force)
 	fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
 	if (dry_run)
 		return 0;
-	url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
+	url = xstrfmt("%s%s", repo->url, remote_ref->name);
-	sprintf(url, "%s%s", repo->url, remote_ref->name);
 	slot = get_active_slot();
 	slot->results = &results;
 	curl_setup_http_get(slot->curl, url, DAV_DELETE);

http-walker.c

@@ -341,8 +341,7 @@ static void fetch_alternates(struct walker *walker, const char *base)
 	if (walker->get_verbosely)
 		fprintf(stderr, "Getting alternates list for %s\n", base);
 
-	url = xmalloc(strlen(base) + 31);
+	url = xstrfmt("%s/objects/info/http-alternates", base);
-	sprintf(url, "%s/objects/info/http-alternates", base);
 
 	/*
 	 * Use a callback to process the result, since another request

match-trees.c

@@ -140,17 +140,12 @@ static void match_trees(const unsigned char *hash1,
 			goto next;
 		score = score_trees(elem, hash2);
 		if (*best_score < score) {
-			char *newpath;
-			newpath = xmalloc(strlen(base) + strlen(path) + 1);
-			sprintf(newpath, "%s%s", base, path);
 			free(*best_match);
-			*best_match = newpath;
+			*best_match = xstrfmt("%s%s", base, path);
 			*best_score = score;
 		}
 		if (recurse_limit) {
-			char *newbase;
+			char *newbase = xstrfmt("%s%s/", base, path);
-			newbase = xmalloc(strlen(base) + strlen(path) + 2);
-			sprintf(newbase, "%s%s/", base, path);
 			match_trees(elem, hash2, best_score, best_match,
 				    newbase, recurse_limit - 1);
 			free(newbase);

merge-recursive.c

@@ -969,14 +969,10 @@ merge_file_special_markers(struct merge_options *o,
 	char *side2 = NULL;
 	struct merge_file_info mfi;
 
-	if (filename1) {
+	if (filename1)
-		side1 = xmalloc(strlen(branch1) + strlen(filename1) + 2);
+		side1 = xstrfmt("%s:%s", branch1, filename1);
-		sprintf(side1, "%s:%s", branch1, filename1);
+	if (filename2)
-	}
+		side2 = xstrfmt("%s:%s", branch2, filename2);
-	if (filename2) {
-		side2 = xmalloc(strlen(branch2) + strlen(filename2) + 2);
-		sprintf(side2, "%s:%s", branch2, filename2);
-	}
 
 	mfi = merge_file_1(o, one, a, b,
 			   side1 ? side1 : branch1, side2 ? side2 : branch2);