added custom printf test

Author: ZERICO2005

test/standalone/custom_printf/autotest.json

@@ -0,0 +1,39 @@
+{
+  "transfer_files": [
+    "bin/DEMO.8xp"
+  ],
+  "target": {
+    "name": "DEMO",
+    "isASM": true
+  },
+  "sequence": [
+    "action|launch",
+    "delay|1000",
+    "hashWait|1",
+    "key|enter",
+    "delay|400",
+    "hashWait|2"
+  ],
+  "hashes": {
+    "1": {
+      "description": "%s should print ALL CAPS with the custom printf",
+      "start": "vram_start",
+      "size": "vram_16_size",
+      "expected_CRCs": [
+        "F449EF83"
+      ]
+    },
+    "2": {
+      "description": "Exit",
+      "start": "vram_start",
+      "size": "vram_16_size",
+      "expected_CRCs": [
+        "FFAF89BA",
+        "101734A5",
+        "9DA19F44",
+        "A32840C8",
+        "349F4775"
+      ]
+    }
+  }
+}

test/standalone/custom_printf/makefile

@@ -0,0 +1,20 @@
+# ----------------------------
+# Makefile Options
+# ----------------------------
+
+NAME = DEMO
+ICON = icon.png
+DESCRIPTION = "CE C Toolchain Demo"
+COMPRESSED = NO
+ARCHIVED = NO
+
+CFLAGS = -Wall -Wextra -Wshadow -Oz
+CXXFLAGS = -Wall -Wextra -Wshadow -Oz
+
+PREFER_OS_LIBC = NO
+PREFER_OS_CRT = NO
+HAS_PRINTF = NO
+
+# ----------------------------
+
+include $(shell cedev-config --makefile)

test/standalone/custom_printf/src/custom_sprintf.c

@@ -0,0 +1,34 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <ctype.h>
+
+// custom version of sprintf where %s is all uppercase
+int sprintf(char *buffer, const char *__restrict format, ...) {
+    va_list args;
+    va_start(args, format);
+
+    int count = 0;
+    const char *ptr = format;
+    while (*ptr != '\0') {
+        if (*ptr == '%' && *(ptr + 1) == 's') {
+            const char *str = va_arg(args, const char*);
+            while (*str != '\0') {
+                *buffer = toupper(*str);
+                buffer++;
+                str++;
+                count++;
+            }
+            // consume %s
+            ptr += 2;
+            continue;
+        }
+        *buffer = *ptr;
+        buffer++;
+        ptr++;
+        count++;
+    }
+    *buffer++ = '\0';
+
+    va_end(args);
+    return count;
+}

test/standalone/custom_printf/src/main.c

@@ -0,0 +1,20 @@
+#include <ti/screen.h>
+#include <ti/getcsc.h>
+#include <ti/sprintf.h>
+#include <stdio.h>
+
+int main(void) {
+    char buf[50];
+    os_ClrHome();
+
+    // test that we are using a custom printf and not the real one
+    const char *str = "printf";
+    int result = sprintf(buf, "custom %s!", str);
+    puts(buf);
+    boot_sprintf(buf, "returned %d", result);
+    puts(buf);
+
+    while (!os_GetCSC());
+
+    return 0;
+}