at91/libat91/printf.c

	printf.c revision 199767f8919635c4928607450d9e0abb932109ce
/*-
 * Copyright (c) 1998 Robert Nordier
 * All rights reserved.
 * Copyright (c) 2006 M. Warner Losh
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are freely
 * permitted provided that the above copyright notice and this
 * paragraph and the following disclaimer are duplicated in all
 * such forms.
 *
 * This software is provided "AS IS" and without any express or
 * implied warranties, including, without limitation, the implied
 * warranties of merchantability and fitness for a particular
 * purpose.
 *
 * $FreeBSD$
 */

#include <stdarg.h>
#include "lib.h"

void
printf(const char *fmt,...)
{
    va_list ap;
    const char *hex = "0123456789abcdef";
    char buf[10];
    char *s;
    unsigned u;
    int c;

    va_start(ap, fmt);
    while ((c = *fmt++)) {
        if (c == '%') {
            c = *fmt++;
            switch (c) {
            case 'c':
                xputchar(va_arg(ap, int));
                continue;
            case 's':
                for (s = va_arg(ap, char *); *s; s++)
                    xputchar(*s);
                continue;
            case 'd':   /* A lie, always prints unsigned */
            case 'u':
                u = va_arg(ap, unsigned);
                s = buf;
                do
                    *s++ = '0' + u % 10U;
                while (u /= 10U);
            dumpbuf:;
                while (--s >= buf)
                    xputchar(*s);
                continue;
            case 'x':
                u = va_arg(ap, unsigned);
                s = buf;
                do
                    *s++ = hex[u & 0xfu];
                while (u >>= 4);
                goto dumpbuf;
            }
        }
        xputchar(c);
    }
    va_end(ap);

    return;
}