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      1 /*	$NetBSD: printf.c,v 1.7 2016/02/14 18:05:31 dholland Exp $	*/
      2 /*-
      3  * Copyright (c) 1998 Robert Nordier
      4  * All rights reserved.
      5  * Copyright (c) 2006 M. Warner Losh
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms are freely
      9  * permitted provided that the above copyright notice and this
     10  * paragraph and the following disclaimer are duplicated in all
     11  * such forms.
     12  *
     13  * This software is provided "AS IS" and without any express or
     14  * implied warranties, including, without limitation, the implied
     15  * warranties of merchantability and fitness for a particular
     16  * purpose.
     17  *
     18  * $FreeBSD: src/sys/boot/mips/emips/libemips/printf.c,v 1.2 2006/10/20 09:12:05 imp Exp $
     19  */
     20 
     21 #include <lib/libsa/stand.h>
     22 #include "common.h"
     23 
     24 void
     25 xputchar(int ch)
     26 {
     27     if (ch == '\n')
     28 	putchar('\r');
     29     putchar(ch);
     30 }
     31 
     32 void
     33 printf(const char *fmt,...)
     34 {
     35 	va_list ap;
     36 	const char *hex = "0123456789abcdef";
     37 	char buf[10];
     38 	char *s;
     39 	unsigned u;
     40 	int c;
     41 
     42 	va_start(ap, fmt);
     43 	while ((c = *fmt++)) {
     44 		if (c == '%') {
     45         again:
     46 			c = *fmt++;
     47 			switch (c) {
     48 			case 'l':
     49 				goto again;
     50 			case 'c':
     51 				xputchar(va_arg(ap, int));
     52 				continue;
     53 			case 's':
     54 				for (s = va_arg(ap, char *); s && *s; s++)
     55 					xputchar(*s);
     56 				continue;
     57 			case 'd':	/* A lie, always prints unsigned */
     58 			case 'u':
     59 				u = va_arg(ap, unsigned);
     60 				s = buf;
     61 				do
     62 					*s++ = '0' + u % 10U;
     63 				while (u /= 10U);
     64 			dumpbuf:;
     65 				while (--s >= buf)
     66 					xputchar(*s);
     67 				continue;
     68 			case 'x':
     69 			case 'p':
     70 				u = va_arg(ap, unsigned);
     71 				s = buf;
     72 				do
     73 					*s++ = hex[u & 0xfu];
     74 				while (u >>= 4);
     75 				goto dumpbuf;
     76 			case 0:
     77 				va_end(ap);
     78 				return;
     79 			}
     80 		}
     81 		xputchar(c);
     82 	}
     83 	va_end(ap);
     84 
     85 	return;
     86 }
     87