source: arduino-1-6-7/trunk/fuentes/arduino-ide-amd64/hardware/arduino/avr/firmwares/wifishield/wifiHD/src/printf-stdarg.c @ 4837

/* This source file is part of the ATMEL AVR32-SoftwareFramework-AT32UC3A-1.4.0 Release */

/*This file has been prepared for Doxygen automatic documentation generation.*/
/*! \file *********************************************************************
 *
 * \brief sprintf functions to replace newlib for AVR32 UC3.
 *
 * - Compiler:           IAR EWAVR32 and GNU GCC for AVR32
 * - Supported devices:  All AVR32 devices can be used.
 * - AppNote:
 *
 * \author               Atmel Corporation: http://www.atmel.com \n
 *                       Support and FAQ: http://support.atmel.no/
 *
 *****************************************************************************/

/* Copyright (C) 2006-2008, Atmel Corporation All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name of ATMEL may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
 * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
        Copyright 2001, 2002 Georges Menie (www.menie.org)
        stdarg version contributed by Christian Ettinger

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
        putchar is the only external dependency for this file,
        if you have a working putchar, leave it commented out.
        If not, uncomment the define below and
        replace outbyte(c) by your own function call.

*/


#include <stdarg.h>

static void printchar(char **str, int c)
{
        extern int board_putchar(char c);
        
        if (str) {
                **str = c;
                ++(*str);
        }
        else (void) board_putchar(c);
}

#define PAD_RIGHT 1
#define PAD_ZERO 2

static int prints(char **out, const char *string, int width, int pad)
{
        register int pc = 0, padchar = ' ';

        if (width > 0) {
                register int len = 0;
                register const char *ptr;
                for (ptr = string; *ptr; ++ptr) ++len;
                if (len >= width) width = 0;
                else width -= len;
                if (pad & PAD_ZERO) padchar = '0';
        }
        if (!(pad & PAD_RIGHT)) {
                for ( ; width > 0; --width) {
                        printchar (out, padchar);
                        ++pc;
                }
        }
        for ( ; *string ; ++string) {
                printchar (out, *string);
                ++pc;
        }
        for ( ; width > 0; --width) {
                printchar (out, padchar);
                ++pc;
        }

        return pc;
}

/* the following should be enough for 32 bit int */
#define PRINT_BUF_LEN 12

static int printi(char **out, int i, int b, int sg, int width, int pad, int letbase)
{
        char print_buf[PRINT_BUF_LEN];
        register char *s;
        register int t, neg = 0, pc = 0;
        register unsigned int u = i;

        if (i == 0) {
                print_buf[0] = '0';
                print_buf[1] = '\0';
                return prints (out, print_buf, width, pad);
        }

        if (sg && b == 10 && i < 0) {
                neg = 1;
                u = -i;
        }

        s = print_buf + PRINT_BUF_LEN-1;
        *s = '\0';

        while (u) {
                t = u % b;
                if( t >= 10 )
                        t += letbase - '0' - 10;
                *--s = t + '0';
                u /= b;
        }

        if (neg) {
                if( width && (pad & PAD_ZERO) ) {
                        printchar (out, '-');
                        ++pc;
                        --width;
                }
                else {
                        *--s = '-';
                }
        }

        return pc + prints (out, s, width, pad);
}

#if 0
int fprintf(__FILE *stream, const char *format, ...)
{
return 0;
}
#endif

int printk_va(char **out, const char *format, va_list args )
{
        register int width, pad;
        register int pc = 0;
        char scr[2];

        for (; *format != 0; ++format) {
                if (*format == '%') {
                        ++format;
                        width = pad = 0;
                        if (*format == '\0') break;
                        if (*format == '%') goto out;
                        if (*format == '-') {
                                ++format;
                                pad = PAD_RIGHT;
                        }
                        while (*format == '0') {
                                ++format;
                                pad |= PAD_ZERO;
                        }
                        for ( ; *format >= '0' && *format <= '9'; ++format) {
                                width *= 10;
                                width += *format - '0';
                        }
                        if( *format == 's' ) {
                                register char *s = (char *)va_arg( args, int );
                                pc += prints (out, s?s:"(null)", width, pad);
                                continue;
                        }
                        if( *format == 'd' ) {
                                pc += printi (out, va_arg( args, int ), 10, 1, width, pad, 'a');
                                continue;
                        }
                        if( *format == 'p' ) {
                                pad = 8;
                                pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'a');
                                continue;
                        }
                        if( *format == 'x' ) {
                                pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'a');
                                continue;
                        }
                        if( *format == 'X' ) {
                                pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'A');
                                continue;
                        }
                        if( *format == 'u' ) {
                                pc += printi (out, va_arg( args, int ), 10, 0, width, pad, 'a');
                                continue;
                        }
                        if( *format == 'c' ) {
                                /* char are converted to int then pushed on the stack */
                                scr[0] = (char)va_arg( args, int );
                                scr[1] = '\0';
                                pc += prints (out, scr, width, pad);
                                continue;
                        }
                }
                else {
                out:
                        printchar (out, *format);
                        ++pc;
                }
        }
        if (out) **out = '\0';
        va_end( args );
        return pc;
}

int printk(const char *format, ...)
{
        va_list args;
        
        va_start( args, format );
        return printk_va( 0, format, args );
}

#ifndef __ARM__
int sprintf(char *out, const char *format, ...)
{
        va_list args;
        
        va_start( args, format );
        return printk_va( &out, format, args );
}
#endif

#ifdef TEST_PRINTF
int main(void)
{
        char *ptr = "Hello world!";
        char *np = 0;
        int i = 5;
        unsigned int bs = sizeof(int)*8;
        int mi;
        char buf[80];

        mi = (1 << (bs-1)) + 1;
        printf("%s\n", ptr);
        printf("printf test\n");
        printf("%s is null pointer\n", np);
        printf("%d = 5\n", i);
        printf("%d = - max int\n", mi);
        printf("char %c = 'a'\n", 'a');
        printf("hex %x = ff\n", 0xff);
        printf("hex %02x = 00\n", 0);
        printf("signed %d = unsigned %u = hex %x\n", -3, -3, -3);
        printf("%d %s(s)%", 0, "message");
        printf("\n");
        printf("%d %s(s) with %%\n", 0, "message");
        sprintf(buf, "justif: \"%-10s\"\n", "left"); printf("%s", buf);
        sprintf(buf, "justif: \"%10s\"\n", "right"); printf("%s", buf);
        sprintf(buf, " 3: %04d zero padded\n", 3); printf("%s", buf);
        sprintf(buf, " 3: %-4d left justif.\n", 3); printf("%s", buf);
        sprintf(buf, " 3: %4d right justif.\n", 3); printf("%s", buf);
        sprintf(buf, "-3: %04d zero padded\n", -3); printf("%s", buf);
        sprintf(buf, "-3: %-4d left justif.\n", -3); printf("%s", buf);
        sprintf(buf, "-3: %4d right justif.\n", -3); printf("%s", buf);

        return 0;
}

/*
 * if you compile this file with
 *   gcc -Wall $(YOUR_C_OPTIONS) -DTEST_PRINTF -c printf.c
 * you will get a normal warning:
 *   printf.c:214: warning: spurious trailing `%' in format
 * this line is testing an invalid % at the end of the format string.
 *
 * this should display (on 32bit int machine) :
 *
 * Hello world!
 * printf test
 * (null) is null pointer
 * 5 = 5
 * -2147483647 = - max int
 * char a = 'a'
 * hex ff = ff
 * hex 00 = 00
 * signed -3 = unsigned 4294967293 = hex fffffffd
 * 0 message(s)
 * 0 message(s) with %
 * justif: "left      "
 * justif: "     right"
 *  3: 0003 zero padded
 *  3: 3    left justif.
 *  3:    3 right justif.
 * -3: -003 zero padded
 * -3: -3   left justif.
 * -3:   -3 right justif.
 */

#endif