1 files changed, 80 insertions, 0 deletions

diff --git a/bootloader/snprintf.c b/bootloader/snprintf.c
new file mode 100644
index 0000000000..d64bb32447
--- /dev/null
+++ b/bootloader/snprintf.c
@@ -0,0 +1,80 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Gary Czvitkovicz
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+/*
+ * Minimal printf and snprintf formatting functions
+ *
+ * These support %c %s %l %d %u and %x(%p)
+ * Field width and zero-padding flag only
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <limits.h>
+#include "format.h"
+
+struct for_snprintf {
+    unsigned char *ptr; /* where to store it */
+    size_t bytes; /* amount already stored */
+    size_t max;   /* max amount to store */
+};
+
+static int sprfunc(void *ptr, unsigned char letter)
+{
+    struct for_snprintf *pr = (struct for_snprintf *)ptr;
+    if(pr->bytes < pr->max) {
+        *pr->ptr = letter;
+        pr->ptr++;
+        pr->bytes++;
+        return true;
+    }
+    return false; /* filled buffer */
+}
+
+
+int snprintf(char *buf, size_t size, const char *fmt, ...)
+{
+    int len;
+    va_list ap;
+
+    va_start(ap, fmt);
+    len = vsnprintf(buf, size, fmt, ap);
+    va_end(ap);
+
+    return len;
+}
+
+int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
+{
+    struct for_snprintf pr;
+
+    pr.ptr = (unsigned char *)buf;
+    pr.bytes = 0;
+    pr.max = size;
+
+    format(sprfunc, &pr, fmt, ap);
+
+    /* make sure it ends with a trailing zero */
+    pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0';
+
+    return pr.bytes;
+}