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/* -*- c -*- */
/*
* Copyright 2007 Free Software Foundation, Inc.
*
* 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 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Based on code from the SDCC z80 library ;)
*/
#include <stdarg.h>
#include <stdio.h>
static void
_printn(unsigned u, unsigned base, char issigned,
void (*emitter)(char, void *), void *pData)
{
const char *_hex = "0123456789ABCDEF";
if (issigned && ((int)u < 0)) {
(*emitter)('-', pData);
u = (unsigned)-((int)u);
}
if (u >= base)
_printn(u/base, base, 0, emitter, pData);
(*emitter)(_hex[u%base], pData);
}
static void
_printf(const char *format, void (*emitter)(char, void *),
void *pData, va_list va)
{
while (*format) {
if (*format != '%')
(*emitter)(*format, pData);
else {
switch (*++format) {
case 0: /* hit end of format string */
return;
case 'c':
{
char c = (char)va_arg(va, int);
(*emitter)(c, pData);
break;
}
case 'u':
{
unsigned u = va_arg(va, unsigned);
_printn(u, 10, 0, emitter, pData);
break;
}
case 'd':
{
unsigned u = va_arg(va, unsigned);
_printn(u, 10, 1, emitter, pData);
break;
}
case 'x':
case 'p':
{
unsigned u = va_arg(va, unsigned);
_printn(u, 16, 0, emitter, pData);
break;
}
case 's':
{
char *s = va_arg(va, char *);
while (*s) {
(*emitter)(*s, pData);
s++;
}
break;
}
}
}
format++;
}
}
static void
_char_emitter(char c, void *pData __attribute__((unused)))
{
putchar(c);
}
int
printf(const char *format, ...)
{
va_list va;
va_start(va, format);
_printf(format, _char_emitter, NULL, va);
va_end(va);
// wrong return value...
return 0;
}
#if 0
// Totally dangerous. Don't use
static void
_buf_emitter(char c, void *pData)
{
*((*((char **)pData)))++ = c;
}
int sprintf(char *pInto, const char *format, ...)
{
va_list va;
va_start(va, format);
_printf(format, _buf_emitter, &pInto, va);
*pInto++ = '\0';
va_end(va);
// FIXME wrong return value
return 0;
}
#endif
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