From 1ec1b4a9e790f9aaa35728f71901705a3d363c34 Mon Sep 17 00:00:00 2001
From: Intel A80486DX2-66 <larry.holst@disroot.org>
Date: Sun, 28 Jan 2024 15:46:26 +0300
Subject: [PATCH] C: add test for asprintf.c

---
 c-programming/asprintf.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/c-programming/asprintf.c b/c-programming/asprintf.c
index cdb6363..26b488c 100644
--- a/c-programming/asprintf.c
+++ b/c-programming/asprintf.c
@@ -34,3 +34,33 @@ ssize_t asprintf(char** strp, char* format, ...) {
 
 	return result;
 }
+
+#ifdef TEST
+# include <inttypes.h>
+# include <math.h>
+# include <stdbool.h>
+# define PRINT_ASSERT(caption, test) do {                                     \
+    bool test_result = (test);                                                \
+    printf("[test] " caption ": %s\n", test_result ? "OK" : "failed");        \
+    if (test_result == false)                                                 \
+        exit(EXIT_FAILURE);                                                   \
+} while (0);
+
+int main(void) {
+	const char* world = " world";
+
+	char* output;
+	size_t result = asprintf(&output, "Hello%s! -- Unsigned 32-bit type is "
+		"constrained to lie\nwithin the range of integer values from "
+		"%" PRIu32 " to %" PRIu32 " inclusive.", world, 0,
+		(uint32_t) (powf(2.0f, 32.0f) - 1.0f));
+
+	PRINT_ASSERT("segmentation fault", true);
+	PRINT_ASSERT("no errors", errno == 0);
+	PRINT_ASSERT("zero termination test", output[result] == '\0');
+
+	printf("[asprintf (%zu)] '%s'\n", result, output);
+
+	return 0;
+}
+#endif