breezyprintf.c

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/*
 * Copyright (c) 2004,2012 Kustaa Nyholm / SpareTimeLabs
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this list 
 * of conditions and the following disclaimer.
 * 
 * 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.
 *  
 * Neither the name of the Kustaa Nyholm or SpareTimeLabs nor the names of its 
 * contributors may be used to endorse or promote products derived from this software 
 * without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 DISCLAIMED. 
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 */

#include "breezyprintf.h"

typedef void (*putcf) (void*,char);
static putcf stdout_putf;
static void* stdout_putp;


#ifdef PRINTF_LONG_SUPPORT

static void uli2a(unsigned long int num, unsigned int base, int uc,char * bf)
        {
        int n=0;
        unsigned int d=1;
        while (num/d >= base)
                d*=base;                 
        while (d!=0) {
                int dgt = num / d;
                num%=d;
                d/=base;
                if (n || dgt>0|| d==0) {
                        *bf++ = dgt+(dgt<10 ? '0' : (uc ? 'A' : 'a')-10);
                        ++n;
                        }
                }
        *bf=0;
        }

static void li2a (long num, char * bf)
        {
        if (num<0) {
                num=-num;
                *bf++ = '-';
                }
        uli2a(num,10,0,bf);
        }

#endif

static void ui2a(unsigned int num, unsigned int base, int uc,char * bf)
        {
        int n=0;
        unsigned int d=1;
        while (num/d >= base)
                d*=base;                
        while (d!=0) {
                int dgt = num / d;
                num%= d;
                d/=base;
                if (n || dgt>0 || d==0) {
                        *bf++ = dgt+(dgt<10 ? '0' : (uc ? 'A' : 'a')-10);
                        ++n;
                        }
                }
        *bf=0;
        }

static void i2a (int num, char * bf)
        {
        if (num<0) {
                num=-num;
                *bf++ = '-';
                }
        ui2a(num,10,0,bf);
        }

static int a2d(char ch)
        {
        if (ch>='0' && ch<='9') 
                return ch-'0';
        else if (ch>='a' && ch<='f')
                return ch-'a'+10;
        else if (ch>='A' && ch<='F')
                return ch-'A'+10;
        else return -1;
        }

static char a2i(char ch, char** src,int base,int* nump)
        {
        char* p= *src;
        int num=0;
        int digit;
        while ((digit=a2d(ch))>=0) {
                if (digit>base) break;
                num=num*base+digit;
                ch=*p++;
                }
        *src=p;
        *nump=num;
        return ch;
        }

static void putchw(void* putp,putcf putf,int n, char z, char* bf)
        {
        char fc=z? '0' : ' ';
        char ch;
        char* p=bf;
        while (*p++ && n > 0)
                n--;
        while (n-- > 0) 
                putf(putp,fc);
        while ((ch= *bf++))
                putf(putp,ch);
        }

void tfp_format(void* putp, putcf putf, const char *fmt, va_list va)
        {
        char bf[12];
    
        char ch;


        while ((ch=*(fmt++))) {
                if (ch!='%') 
                        putf(putp,ch);
                else {
                        char lz=0;
#ifdef  PRINTF_LONG_SUPPORT
                        char lng=0;
#endif
                        int w=0;
                        ch=*(fmt++);
                        if (ch=='0') {
                                ch=*(fmt++);
                                lz=1;
                                }
                        if (ch>='0' && ch<='9') {
                                ch=a2i(ch, (char **)&fmt, 10, &w);
                                }
#ifdef  PRINTF_LONG_SUPPORT
                        if (ch=='l') {
                                ch=*(fmt++);
                                lng=1;
                        }
#endif
                        switch (ch) {
                                case 0: 
                                        goto abort;
                                case 'u' : {
#ifdef  PRINTF_LONG_SUPPORT
                                        if (lng)
                                                uli2a(va_arg(va, unsigned long int),10,0,bf);
                                        else
#endif
                                        ui2a(va_arg(va, unsigned int),10,0,bf);
                                        putchw(putp,putf,w,lz,bf);
                                        break;
                                        }
                                case 'd' :  {
#ifdef  PRINTF_LONG_SUPPORT
                                        if (lng)
                                                li2a(va_arg(va, unsigned long int),bf);
                                        else
#endif
                                        i2a(va_arg(va, int),bf);
                                        putchw(putp,putf,w,lz,bf);
                                        break;
                                        }
                                case 'x': case 'X' : 
#ifdef  PRINTF_LONG_SUPPORT
                                        if (lng)
                                                uli2a(va_arg(va, unsigned long int),16,(ch=='X'),bf);
                                        else
#endif
                                        ui2a(va_arg(va, unsigned int),16,(ch=='X'),bf);
                                        putchw(putp,putf,w,lz,bf);
                                        break;
                                case 'c' : 
                                        putf(putp,(char)(va_arg(va, int)));
                                        break;
                                case 's' : 
                                        putchw(putp,putf,w,0,va_arg(va, char*));
                                        break;
                                case '%' :
                                        putf(putp,ch);
                                default:
                                        break;
                                }
                        }
                }
        abort:;
        }


void init_printf(void* putp, void (*putf) (void*, char))
        {
        stdout_putf=putf;
        stdout_putp=putp;
        }

void tfp_printf(const char *fmt, ...)
        {
        va_list va;
        va_start(va,fmt);
        tfp_format(stdout_putp,stdout_putf,fmt,va);
        va_end(va);
        }

static void putcp(void* p,char c)
        {
        *(*((char**)p))++ = c;
        }



void tfp_sprintf(char* s, const char *fmt, ...)
        {
        va_list va;
        va_start(va,fmt);
        tfp_format(&s,putcp,fmt,va);
        putcp(&s,0);
        va_end(va);
        }