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