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printf.c revision 1.1 
      1 /*-
      2  * Copyright (c) 1998 Robert Nordier
      3  * All rights reserved.
      4  * Copyright (c) 2006 M. Warner Losh
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms are freely
      8  * permitted provided that the above copyright notice and this
      9  * paragraph and the following disclaimer are duplicated in all
     10  * such forms.
     11  *
     12  * This software is provided "AS IS" and without any express or
     13  * implied warranties, including, without limitation, the implied
     14  * warranties of merchantability and fitness for a particular
     15  * purpose.
     16  *
     17  * $FreeBSD: src/sys/boot/mips/emips/libemips/printf.c,v 1.2 2006/10/20 09:12:05 imp Exp $
     18  */
     19 
     20 #include <machine/stdarg.h>
     21 
     22 void
     23 xputchar(int ch)
     24 {
     25     if (ch == '\n')
     26 	putchar('\r');
     27     putchar(ch);
     28 }
     29 
     30 void
     31 printf(const char *fmt,...)
     32 {
     33 	va_list ap;
     34 	const char *hex = "0123456789abcdef";
     35 	char buf[10];
     36 	char *s;
     37 	unsigned u;
     38 	int c;
     39 
     40 	va_start(ap, fmt);
     41 	while ((c = *fmt++)) {
     42 		if (c == '%') {
     43         again:
     44 			c = *fmt++;
     45 			switch (c) {
     46 			case 'l':
     47 				goto again;
     48 			case 'c':
     49 				xputchar(va_arg(ap, int));
     50 				continue;
     51 			case 's':
     52 				for (s = va_arg(ap, char *); s && *s; s++)
     53 					xputchar(*s);
     54 				continue;
     55 			case 'd':	/* A lie, always prints unsigned */
     56 			case 'u':
     57 				u = va_arg(ap, unsigned);
     58 				s = buf;
     59 				do
     60 					*s++ = '0' + u % 10U;
     61 				while (u /= 10U);
     62 			dumpbuf:;
     63 				while (--s >= buf)
     64 					xputchar(*s);
     65 				continue;
     66 			case 'x':
     67 			case 'p':
     68 				u = va_arg(ap, unsigned);
     69 				s = buf;
     70 				do
     71 					*s++ = hex[u & 0xfu];
     72 				while (u >>= 4);
     73 				goto dumpbuf;
     74             case 0:
     75                 return;
     76 			}
     77 		}
     78 		xputchar(c);
     79 	}
     80 	va_end(ap);
     81 
     82 	return;
     83 }
     84