daemon: replace atoi() with strtoul_ui() and strtol_i()

Replace atoi() with strtoul_ui() for --timeout and --init-timeout
(non-negative integers) and with strtol_i() for --max-connections
(signed integers). This improves error handling and input validation
by detecting invalid values and providing clear error messages.
Update tests to ensure these arguments are properly validated.

Signed-off-by: Usman Akinyemi <[email protected]>

Author: Unique-Usman

daemon.c

@@ -1308,17 +1308,20 @@ int cmd_main(int argc, const char **argv)
 			continue;
 		}
 		if (skip_prefix(arg, "--timeout=", &v)) {
-			timeout = atoi(v);
+			if (strtoul_ui(v, 10, &timeout))
+				die("invalid timeout '%s', expecting a non-negative integer", v);
 			continue;
 		}
 		if (skip_prefix(arg, "--init-timeout=", &v)) {
-			init_timeout = atoi(v);
+			if (strtoul_ui(v, 10, &init_timeout))
+				die("invalid init-timeout '%s', expecting a non-negative integer", v);
 			continue;
 		}
 		if (skip_prefix(arg, "--max-connections=", &v)) {
-			max_connections = atoi(v);
+			if (strtol_i(v, 10, &max_connections))
+				die("invalid max-connections '%s', expecting an integer", v);
 			if (max_connections < 0)
-				max_connections = 0;	        /* unlimited */
+				max_connections = 0;  /* unlimited */
 			continue;
 		}
 		if (!strcmp(arg, "--strict-paths")) {

t/t5570-git-daemon.sh

@@ -8,6 +8,32 @@ TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-git-daemon.sh
+
+test_expect_success 'daemon rejects invalid --init-timeout values' '
+	for arg in "3a" "-3"
+	do
+		test_must_fail git daemon --init-timeout="$arg" 2>actual_error &&
+		test_write_lines "fatal: invalid init-timeout ${SQ}$arg${SQ}, expecting a non-negative integer" >expected &&
+		test_cmp actual_error expected || return 1
+	done
+'
+
+test_expect_success 'daemon rejects invalid --timeout values' '
+	for arg in "3a" "-3"
+	do
+		test_must_fail git daemon --timeout="$arg" 2>actual_error &&
+		test_write_lines "fatal: invalid timeout ${SQ}$arg${SQ}, expecting a non-negative integer" >expected &&
+		test_cmp actual_error expected || return 1
+	done
+'
+
+test_expect_success 'daemon rejects invalid --max-connections values' '
+	arg='3a' &&
+	test_must_fail git daemon --max-connections=3a 2>actual_error &&
+	test_write_lines "fatal: invalid max-connections ${SQ}$arg${SQ}, expecting an integer" >expected &&
+	test_cmp actual_error expected
+'
+
 start_git_daemon
 
 check_verbose_connect () {