Merge branch 'jk/tighten-alloc'

Update various codepaths to avoid manually-counted malloc().

* jk/tighten-alloc: (22 commits)
  ewah: convert to REALLOC_ARRAY, etc
  convert ewah/bitmap code to use xmalloc
  diff_populate_gitlink: use a strbuf
  transport_anonymize_url: use xstrfmt
  git-compat-util: drop mempcpy compat code
  sequencer: simplify memory allocation of get_message
  test-path-utils: fix normalize_path_copy output buffer size
  fetch-pack: simplify add_sought_entry
  fast-import: simplify allocation in start_packfile
  write_untracked_extension: use FLEX_ALLOC helper
  prepare_{git,shell}_cmd: use argv_array
  use st_add and st_mult for allocation size computation
  convert trivial cases to FLEX_ARRAY macros
  use xmallocz to avoid size arithmetic
  convert trivial cases to ALLOC_ARRAY
  convert manual allocations to argv_array
  argv-array: add detach function
  add helpers for allocating flex-array structs
  harden REALLOC_ARRAY and xcalloc against size_t overflow
  tree-diff: catch integer overflow in combine_diff_path allocation
  ...

1 files changed, 25 insertions, 35 deletions

diff --git a/run-command.c b/run-command.c
index cdf0184579..019f6d19a5 100644
--- a/run-command.c
+++ b/run-command.c
@@ -160,50 +160,41 @@ int sane_execvp(const char *file, char * const argv[])
 	return -1;
 }
 
-static const char **prepare_shell_cmd(const char **argv)
+static const char **prepare_shell_cmd(struct argv_array *out, const char **argv)
 {
-	int argc, nargc = 0;
-	const char **nargv;
-
-	for (argc = 0; argv[argc]; argc++)
-		; /* just counting */
-	/* +1 for NULL, +3 for "sh -c" plus extra $0 */
-	nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));
-
-	if (argc < 1)
+	if (!argv[0])
 		die("BUG: shell command is empty");
 
 	if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
 #ifndef GIT_WINDOWS_NATIVE
-		nargv[nargc++] = SHELL_PATH;
+		argv_array_push(out, SHELL_PATH);
 #else
-		nargv[nargc++] = "sh";
+		argv_array_push(out, "sh");
 #endif
-		nargv[nargc++] = "-c";
-
-		if (argc < 2)
-			nargv[nargc++] = argv[0];
-		else {
-			struct strbuf arg0 = STRBUF_INIT;
-			strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
-			nargv[nargc++] = strbuf_detach(&arg0, NULL);
-		}
-	}
+		argv_array_push(out, "-c");
 
-	for (argc = 0; argv[argc]; argc++)
-		nargv[nargc++] = argv[argc];
-	nargv[nargc] = NULL;
+		/*
+		 * If we have no extra arguments, we do not even need to
+		 * bother with the "$@" magic.
+		 */
+		if (!argv[1])
+			argv_array_push(out, argv[0]);
+		else
+			argv_array_pushf(out, "%s \"$@\"", argv[0]);
+	}
 
-	return nargv;
+	argv_array_pushv(out, argv);
+	return out->argv;
 }
 
 #ifndef GIT_WINDOWS_NATIVE
 static int execv_shell_cmd(const char **argv)
 {
-	const char **nargv = prepare_shell_cmd(argv);
-	trace_argv_printf(nargv, "trace: exec:");
-	sane_execvp(nargv[0], (char **)nargv);
-	free(nargv);
+	struct argv_array nargv = ARGV_ARRAY_INIT;
+	prepare_shell_cmd(&nargv, argv);
+	trace_argv_printf(nargv.argv, "trace: exec:");
+	sane_execvp(nargv.argv[0], (char **)nargv.argv);
+	argv_array_clear(&nargv);
 	return -1;
 }
 #endif
@@ -457,6 +448,7 @@ fail_pipe:
 {
 	int fhin = 0, fhout = 1, fherr = 2;
 	const char **sargv = cmd->argv;
+	struct argv_array nargv = ARGV_ARRAY_INIT;
 
 	if (cmd->no_stdin)
 		fhin = open("/dev/null", O_RDWR);
@@ -482,9 +474,9 @@ fail_pipe:
 		fhout = dup(cmd->out);
 
 	if (cmd->git_cmd)
-		cmd->argv = prepare_git_cmd(cmd->argv);
+		cmd->argv = prepare_git_cmd(&nargv, cmd->argv);
 	else if (cmd->use_shell)
-		cmd->argv = prepare_shell_cmd(cmd->argv);
+		cmd->argv = prepare_shell_cmd(&nargv, cmd->argv);
 
 	cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env,
 			cmd->dir, fhin, fhout, fherr);
@@ -494,9 +486,7 @@ fail_pipe:
 	if (cmd->clean_on_exit && cmd->pid >= 0)
 		mark_child_for_cleanup(cmd->pid);
 
-	if (cmd->git_cmd)
-		free(cmd->argv);
-
+	argv_array_clear(&nargv);
 	cmd->argv = sargv;
 	if (fhin != 0)
 		close(fhin);