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258 lines
6.4 KiB
C
258 lines
6.4 KiB
C
/**
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******************************************************************************
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* @addtogroup PIOS PIOS Core hardware abstraction layer
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* @{
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*
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* @file printf-stdarg.c
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* Parts by Thorsten Klose (tk@midibox.org)
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* @brief Formatted print functions
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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putchar is the only external dependency for this file,
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if you have a working putchar, leave it commented out.
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If not, uncomment the define below and
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replace outbyte(c) by your own function call.
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#define putchar(c) outbyte(c)
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*/
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// #define putchar(c) COMSendChar(c)
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#include <pios.h>
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static void printchar(char * *str, int c)
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{
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if (str) {
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**str = c;
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++(*str);
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}
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#ifdef PIOS_COM_DEBUG
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else {
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PIOS_COM_SendChar(PIOS_COM_DEBUG, c);
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}
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#endif
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}
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#define PAD_RIGHT 1
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#define PAD_ZERO 2
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static int prints(char * *out, const char *string, int width, int pad, int limit)
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{
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register int pc = limit, padchar = ' ';
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if (width > 0) {
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register int len = 0;
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register const char *ptr;
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for (ptr = string; *ptr; ++ptr) {
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++len;
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}
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if (len >= width) {
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width = 0;
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} else {
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width -= len;
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}
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if (pad & PAD_ZERO) {
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padchar = '0';
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}
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}
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if (!(pad & PAD_RIGHT)) {
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for (; width > 0 && pc; --width) {
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printchar(out, padchar);
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--pc;
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}
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}
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for (; *string && pc; ++string) {
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printchar(out, *string);
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--pc;
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}
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for (; width > 0 && pc; --width) {
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printchar(out, padchar);
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--pc;
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}
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return limit - pc;
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}
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/* the following should be enough for 32 bit int */
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#define PRINT_BUF_LEN 12
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static int printi(char * *out, int i, int b, int sg, int width, int pad, int letbase, int limit)
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{
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char print_buf[PRINT_BUF_LEN];
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register char *s;
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register int t, neg = 0, pc = limit;
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register unsigned int u = i;
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if (i == 0) {
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print_buf[0] = '0';
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print_buf[1] = '\0';
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return prints(out, print_buf, width, pad, limit);
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}
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if (sg && b == 10 && i < 0) {
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neg = 1;
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u = -i;
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}
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s = print_buf + PRINT_BUF_LEN - 1;
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*s = '\0';
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while (u) {
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t = u % b;
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if (t >= 10) {
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t += letbase - '0' - 10;
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}
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*--s = t + '0';
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u /= b;
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}
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if (neg && pc) {
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if (width && (pad & PAD_ZERO)) {
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printchar(out, '-');
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--pc;
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--width;
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} else {
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*--s = '-';
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}
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}
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return (limit - pc) + prints(out, s, width, pad, pc);
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}
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static int print(int limit, char * *out, const char *format, va_list args)
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{
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register int width, pad;
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register int pc = limit;
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char scr[2];
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for (; *format != 0 && pc; ++format) {
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if (*format == '%') {
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++format;
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width = pad = 0;
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if (*format == '\0') {
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break;
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}
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if (*format == '%') {
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goto out;
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}
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if (*format == '-') {
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++format;
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pad = PAD_RIGHT;
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}
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while (*format == '0') {
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++format;
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pad |= PAD_ZERO;
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}
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for (; *format >= '0' && *format <= '9'; ++format) {
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width *= 10;
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width += *format - '0';
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}
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if (*format == 's') {
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register char *s = (char *)va_arg(args, int);
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pc -= prints(out, s ? s : "(null)", width, pad, pc);
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continue;
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}
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if (*format == 'd') {
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pc -= printi(out, va_arg(args, int), 10, 1, width, pad, 'a', pc);
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continue;
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}
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if (*format == 'x') {
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pc -= printi(out, va_arg(args, int), 16, 0, width, pad, 'a', pc);
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continue;
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}
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if (*format == 'X') {
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pc -= printi(out, va_arg(args, int), 16, 0, width, pad, 'A', pc);
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continue;
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}
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if (*format == 'u') {
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pc -= printi(out, va_arg(args, int), 10, 0, width, pad, 'a', pc);
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continue;
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}
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if (*format == 'c') {
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/* char are converted to int then pushed on the stack */
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scr[0] = (char)va_arg(args, int);
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scr[1] = '\0';
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pc -= prints(out, scr, width, pad, pc);
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continue;
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}
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} else {
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out:
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printchar(out, *format);
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--pc;
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}
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}
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if (out) {
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**out = '\0';
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}
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va_end(args);
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return limit - pc;
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}
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int printf(const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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return print(-1, 0, format, args);
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}
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// TK: added for alternative parameter passing
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int vprintf(const char *format, va_list args)
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{
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return print(-1, 0, format, args);
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}
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int sprintf(char *out, const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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return print(-1, &out, format, args);
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}
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// TK: added for alternative parameter passing
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int vsprintf(char *out, const char *format, va_list args)
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{
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char *_out;
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_out = out;
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return print(-1, &_out, format, args);
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}
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int snprintf(char *buf, size_t count, const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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return print(count, &buf, format, args);
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}
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// TK: added for alternative parameter passing
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int vsnprintf(char *buf, size_t count, const char *format, va_list args)
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{
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return print(count, &buf, format, args);
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}
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/**
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* @}
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*/
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