SDL: Added size_t format specifier test coverage for SDL_snprintf and SDL_sscanf

SDL Commits
1 
From c70ffc2a3574a4ad5ccb43f654ebce1c9b25b140 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 19 Sep 2022 15:34:17 -0700
Subject: [PATCH] Added size_t format specifier test coverage for SDL_snprintf
 and SDL_sscanf

---
 test/testautomation_stdlib.c | 45 ++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/test/testautomation_stdlib.c b/test/testautomation_stdlib.c
index 1956d737d65..a89ec1e0b05 100644
--- a/test/testautomation_stdlib.c
+++ b/test/testautomation_stdlib.c
@@ -47,6 +47,7 @@ stdlib_snprintf(void *arg)
   int predicted;
   char text[1024];
   const char *expected;
+  size_t size;
 
   result = SDL_snprintf(text, sizeof(text), "%s", "foo");
   expected = "foo";
@@ -148,6 +149,13 @@ stdlib_snprintf(void *arg)
   SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: '%s', got: '%s'", expected, text);
   SDLTest_AssertCheck(result == 6, "Check result value, expected: 6, got: %d", result);
 
+  size = 64;
+  result = SDL_snprintf(text, sizeof(text), "%zu %s", size, "test"); 
+  expected = "64 test";
+  SDLTest_AssertPass("Call to SDL_snprintf(text, sizeof(text), \"%%zu %%s\", size, \"test\")");
+  SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: '%s', got: '%s'", expected, text);
+  SDLTest_AssertCheck(result == 7, "Check result value, expected: 7, got: %d", result);
+
   return TEST_COMPLETED;
 }
 
@@ -296,6 +304,11 @@ stdlib_sscanf(void *arg)
   int result;
   int expected_output;
   int expected_result;
+  short short_output, expected_short_output;
+  long long_output, expected_long_output;
+  long long long_long_output, expected_long_long_output;
+  size_t size_output, expected_size_output;
+  char text[128];
 
   expected_output = output = 123;
   expected_result = -1;
@@ -327,6 +340,38 @@ stdlib_sscanf(void *arg)
   SDLTest_AssertCheck(expected_output == output, "Check output, expected: %i, got: %i", expected_output, output);
   SDLTest_AssertCheck(expected_result == result, "Check return value, expected: %i, got: %i", expected_result, result);
 
+#define SIZED_TEST_CASE(type, var, format_specifier) \
+  var##_output = 123; \
+  expected_##var##_output = (type)(((unsigned type)(~0)) >> 1); \
+  expected_result = 1; \
+  result = SDL_snprintf(text, sizeof(text), format_specifier, expected_##var##_output); \
+  result = SDL_sscanf(text, format_specifier, &var##_output); \
+  SDLTest_AssertPass("Call to SDL_sscanf(\"%s\", \"%s\", &output)", text, #format_specifier); \
+  SDLTest_AssertCheck(expected_##var##_output == var##_output, "Check output, expected: " format_specifier ", got: " format_specifier, expected_##var##_output, var##_output); \
+  SDLTest_AssertCheck(expected_result == result, "Check return value, expected: %i, got: %i", expected_result, result); \
+ \
+  var##_output = 123; \
+  expected_##var##_output = ~(type)(((unsigned type)(~0)) >> 1); \
+  expected_result = 1; \
+  result = SDL_snprintf(text, sizeof(text), format_specifier, expected_##var##_output); \
+  result = SDL_sscanf(text, format_specifier, &var##_output); \
+  SDLTest_AssertPass("Call to SDL_sscanf(\"%s\", \"%s\", &output)", text, #format_specifier); \
+  SDLTest_AssertCheck(expected_##var##_output == var##_output, "Check output, expected: " format_specifier ", got: " format_specifier, expected_##var##_output, var##_output); \
+  SDLTest_AssertCheck(expected_result == result, "Check return value, expected: %i, got: %i", expected_result, result); \
+
+  SIZED_TEST_CASE(short, short, "%hd")
+  SIZED_TEST_CASE(long, long, "%ld")
+  SIZED_TEST_CASE(long long, long_long, "%lld")
+
+  size_output = 123;
+  expected_size_output = (size_t)~0;
+  expected_result = 1;
+  result = SDL_snprintf(text, sizeof(text), "%zu", expected_size_output);
+  result = SDL_sscanf(text, "%zu", &size_output);
+  SDLTest_AssertPass("Call to SDL_sscanf(\"%s\", \"%%zu\", &output)", text);
+  SDLTest_AssertCheck(expected_size_output == size_output, "Check output, expected: %zu, got: %zu", expected_size_output, size_output);
+  SDLTest_AssertCheck(expected_result == result, "Check return value, expected: %i, got: %i", expected_result, result);
+
   return TEST_COMPLETED;
 }