ksprintf.c

freedos32的源代码

/* Project:     OSLib
 * Description: The OS Construction Kit
 * Date:                1.6.2000
 * Idea by:             Luca Abeni & Gerardo Lamastra
 *
 * OSLib is an SO project aimed at developing a common, easy-to-use
 * low-level infrastructure for developing OS kernels and Embedded
 * Applications; it partially derives from the HARTIK project but it
 * currently is independently developed.
 *
 * OSLib is distributed under GPL License, and some of its code has
 * been derived from the Linux kernel source; also some important
 * ideas come from studying the DJGPP go32 extender.
 *
 * We acknowledge the Linux Community, Free Software Foundation,
 * D.J. Delorie and all the other developers who believe in the
 * freedom of software and ideas.
 *
 * For legalese, check out the included GPL license.
 */

#include <ll/i386/stdlib.h>
#include <ll/i386/string.h>
#include <ll/i386/limits.h>
#include <ll/i386/float.h>
#include <ll/i386/mem.h>
#include <ll/stdarg.h>
#include "sprintf.h"

FILE(ksprintf);

#define STD_SIZE	0
#define SHORT_SIZE	1
#define LONG_SIZE	2

int vksprintf(char *buf,char *fmt,va_list parms)
{
    int scanned = 0,w = 0,prec = 0, l, size = 0;
    int n1 = 0;
    unsigned n2 = 0,parsing = 0,flag = 0;
    char *base = buf;
    char *sp = NULL;
    
    while (*fmt != 0) {
	if (*fmt != '%' && !parsing) {
	    /* No token detected */
	    *buf++ = *fmt++;
	    scanned++;
	}
	else {	    
	    /* We need to make a conversion */
	    if (*fmt == '%') {
		fmt++;
		parsing = 1;
		w = 10;
		prec = 4;
		size = STD_SIZE;
		flag = 0;
	    }
	    /* Parse token */
	    switch(*fmt) {
		case '%' : *buf++ = '%';
			   scanned++;
			   parsing = 0;
			   break;
		case 'c' : *buf++ = va_arg(parms, char);
			   scanned++;
			   parsing = 0;
			   break;
		case 'i' :
	 	case 'd' : switch (size) {
		    		case STD_SIZE : n1 = va_arg(parms, int);
						break;
				case LONG_SIZE : n1 = va_arg(parms, long int);
						 break;
				case SHORT_SIZE : n1 = va_arg(parms, short int);
						  break;
			   }
			   l = dcvt(n1,buf,10,w,flag);
			   scanned += l;
			   buf += l;
			   parsing = 0;
			   break;
		case 'u' : switch (size) {
		    		case STD_SIZE : n2 = va_arg(parms, unsigned);
						break;
				case LONG_SIZE : n2 = va_arg(parms, unsigned long);
						 break;
				case SHORT_SIZE : n2 = va_arg(parms, unsigned short);
						  break;
			   }
			   l = ucvt(n2,buf,10,w,flag);
			   scanned += l;
			   buf += l;
			   parsing = 0;
			   break;
		case 'x' : switch (size) {
		    		case STD_SIZE : n2 = va_arg(parms, unsigned);
						break;
				case LONG_SIZE : n2 = va_arg(parms, unsigned long);
						 break;
				case SHORT_SIZE : n2 = va_arg(parms, unsigned short);
						  break;
			   }
			   l = ucvt(n2,buf,16,w,flag);
			   scanned += l;
			   buf += l;
			   parsing = 0;
			   break;
		case 's' : sp = va_arg(parms, char *);
			   l = 0;
			   while (*sp != 0) {
			       *buf++ = *sp++;
			       l++;
			   }
			   scanned += l;
			   parsing = 0;
			   break;
		case 'l' : size = LONG_SIZE;
			   break;
		case 'n' :
		case 'h' : size = SHORT_SIZE;
			   break;
		case '+' : flag |= ADD_PLUS;
			   break;
		case '-' : flag |= LEFT_PAD;
			   break;
		case '.' : parsing = 2;
			   flag |= RESPECT_WIDTH;
			   break;
		case '1' :
		case '2' :
		case '3' :
		case '4' :
		case '5' :
		case '6' :
		case '7' :
		case '8' :
		case '9' :
		case '0' : if (parsing == 1) {
		    	      w = strtou(fmt,10,&base);
			      /* MG */
			      /* if the first numeral is zero a ZERO pad is */
			      /* required */
			      /* but not if LEFT_PAD is set*/
			      if (*fmt!='0'||flag&LEFT_PAD)
				  flag |= SPACE_PAD ;
			      else
				  flag |= ZERO_PAD ;
			      fmt = base-1;
			   } else if (parsing == 2) {
			       prec = strtou(fmt,10,&base);
			       fmt = base-1;
			       parsing = 1;
			   }
			   break;
		default :  parsing = 0;
			   break;
	    }
	    fmt++;
	}
    }
    *buf = 0;
    return(scanned);
}

int ksprintf(char *buf,char *fmt,...)
{
    va_list parms;
    int result;

    va_start(parms,fmt);
    result = vksprintf(buf,fmt,parms);
    va_end(parms);
    return(result);
}