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- /* $NetBSD: printf.c,v 1.12 1997/06/26 19:11:48 drochner Exp $ */
- /*-
- * Copyright (c) 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)printf.c 8.1 (Berkeley) 6/11/93
- */
- // This version uses almost no stack, and does not suffer from buffer
- // overflows. The downside is that it does not implement a wide range
- // of formatting characters.
- #include <stdint.h>
- #include <stdlib.h>
- #include <stdarg.h>
- #include <stddef.h>
- #include "driver/uart.h"
- static void kprintn (void (*)(const char), uint32_t, int, int, char);
- static void kdoprnt (void (*)(const char), const char *, va_list);
- void
- dbg_printf(const char *fmt, ...)
- {
- va_list ap;
- va_start(ap, fmt);
- kdoprnt(uart0_putc, fmt, ap);
- va_end(ap);
- }
- void
- dbg_vprintf(const char *fmt, va_list ap)
- {
- kdoprnt(uart0_putc, fmt, ap);
- }
- void
- kdoprnt(void (*put)(const char), const char *fmt, va_list ap)
- {
- register char *p;
- register int ch, n;
- unsigned long ul;
- int lflag, set;
- char zwidth;
- char width;
- for (;;) {
- while ((ch = *fmt++) != '%') {
- if (ch == '\0')
- return;
- put(ch);
- }
- lflag = 0;
- width = 0;
- zwidth = ' ';
- reswitch: switch (ch = *fmt++) {
- case '\0':
- /* XXX print the last format character? */
- return;
- case 'l':
- lflag = 1;
- goto reswitch;
- case 'c':
- ch = va_arg(ap, int);
- put(ch & 0x7f);
- break;
- case 's':
- p = va_arg(ap, char *);
- if (p == 0) {
- p = "<null>";
- }
- while ((ch = *p++))
- put(ch);
- break;
- case 'd':
- ul = lflag ?
- va_arg(ap, long) : va_arg(ap, int);
- if ((long)ul < 0) {
- put('-');
- ul = -(long)ul;
- }
- kprintn(put, ul, 10, width, zwidth);
- break;
- case 'o':
- ul = lflag ?
- va_arg(ap, uint32_t) : va_arg(ap, uint32_t);
- kprintn(put, ul, 8, width, zwidth);
- break;
- case 'u':
- ul = lflag ?
- va_arg(ap, uint32_t) : va_arg(ap, uint32_t);
- kprintn(put, ul, 10, width, zwidth);
- break;
- case 'p':
- ul = va_arg(ap, ptrdiff_t);
- kprintn(put, ul, 16, width, zwidth);
- break;
- case 'x':
- ul = lflag ?
- va_arg(ap, uint32_t) : va_arg(ap, uint32_t);
- kprintn(put, ul, 16, width, zwidth);
- break;
- default:
- if (ch >= '0' && ch <= '9') {
- if (ch == '0' && width == 0 && zwidth == ' ') {
- zwidth = '0';
- } else {
- width = width * 10 + ch - '0';
- }
- goto reswitch;
- }
- put('%');
- if (lflag)
- put('l');
- put(ch);
- }
- }
- va_end(ap);
- }
- static void
- kprintn(void (*put)(const char), uint32_t ul, int base, int width, char padchar)
- {
- /* hold a long in base 8 */
- char *p, buf[(sizeof(long) * 8 / 3) + 2];
- p = buf;
- do {
- *p++ = "0123456789abcdef"[ul % base];
- } while (ul /= base);
- while (p - buf < width--) {
- put(padchar);
- }
- do {
- put(*--p);
- } while (p > buf);
- }
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