vsprintf.c

mips架构的bootloader,99左右的版本 但源代码现在没人更新了

/*************************************************************
 * File: lib/vsprintf.c
 * Purpose: Part of C runtime library
 * Author: Phil Bunce ([e-mail])
 * Revision History:
 *	970304	Start of revision history
 */

#include <varargs.h>
#include <stdio.h>
#include <string.h>
#include <strfmt.h>

#define strNcpy(x,y,z)	strncpy(x,y,z),(x)[z]=0

#ifdef PMCC
#include <defines.h>
#else
#define vsprintf xvsprintf
#endif

#ifdef TEST
main(argc,argv)
int argc;
char *argv[];
{

printf("Hello world\n");
printf("%%c, %c%c%c\n",'A','B','C');
printf("%%d, 2356=%d\n",2356);
printf("%%x, 235c=%x\n",0x235C);
printf("%%X, 235C=%X\n",0x235C);
printf("%%08X, 235C=%08X\n",0x235C);
printf("%%b, 11001=%b\n",25);
printf("%%s, Hello=[%s]\n","Hello");
printf("%%10s, Hello=[%10s]\n","Hello");
printf("%%-10s, Hello=[%-10s]\n","Hello");
printf("%%~10s, Hello=[%~10s]\n","Hello");
printf("%%~10s, Hello=[%~10s] World=[%s]\n","Hello","World");
printf("%%~10s, Hello=[%~10s] World=[%-10.5s]\n","Hello","World War");
printf("%%~*s, Hello=[%~*s] World=[%-*.*s]\n",10,"Hello",10,5,"World War");

}

printf(fmt,va_alist)
char *fmt;
va_dcl
{
va_list ap;

va_start(ap);
vfprintf(1,fmt,ap);
va_end(ap);
}

vfprintf(fd,fmt,ap)
int fd;
char *fmt;
va_list ap;
{
char buf[MAXLN+1];

vsprintf(buf,fmt,ap);
write(fd,buf,strlen(buf));
}
#endif

/*************************************************************
*  int vsprintf(d,s,ap)
*/
int vsprintf(d,s,ap)
char *d,*s;
va_list ap;
{
char *t,*p,*dst,tmp[40];
unsigned int n;
int fmt,trunc,haddot,width,base;
#ifdef FLOATINGPT
double dbl;
#endif

dst = d;
for (;*s;) {
	if (*s == '%') {
		s++;
		fmt = FMT_RJUST;
		width = trunc = haddot = 0;
		for (;*s;s++) {
			if (strchr("dobxXuscefg%",*s)) break;
			else if (*s == '-') fmt = FMT_LJUST;
			else if (*s == '0') fmt = FMT_RJUST0;
			else if (*s == '~') fmt = FMT_CENTER;
			else if (*s == '*') {
				if (haddot) trunc = va_arg(ap,int);
				else width = va_arg(ap,int);
				}
			else if (*s >= '1' && *s <= '9') {
				for (t=s;isdigit(*s);s++) ;
				strNcpy(tmp,t,s-t);
				atob(&n,tmp,10);
				if (haddot) trunc = n;
				else width = n;
				s--;
				}
			else if (*s == '.') haddot = 1;
			}
		if (*s == '%') {
			*d++ = '%';
			*d = 0;
			}
		else if (*s == 's') {
			p = va_arg(ap,char *);
			if (p) strcpy(d,p);
			else strcpy(d,"(null)");
			}
		else if (*s == 'c') {
			n = va_arg(ap,int);
			*d = n;
			d[1] = 0;
			}
		else {
			if (strchr("dobxXu",*s)) {
				if (*s == 'd' || *s == 'u') base = 10;
				else if (*s == 'x' || *s == 'X') base = 16;
				else if (*s == 'o') base = 8;
				else if (*s == 'b') base = 2;
				btoa(d,va_arg(ap,int),base);
				if (*s == 'X') strtoupper(d);
				}
#ifdef FLOATINGPT
			else if (strchr("efg",*s)) {
				dbl = va_arg(ap,double);
				dbl_to_ascii(&dbl,tmp);
				if (trunc) trunc_fp(*s,tmp,trunc);
				else trunc_fp(*s,tmp,6);
				strcpy(d,tmp);
				trunc = 0;
				}
#endif
			}
		if (trunc) d[trunc] = 0;
		if (width) str_fmt(d,width,fmt);
		for (;*d;d++) ;
		s++;
		}
	else *d++ = *s++;
	}
*d = 0;
return(d-dst);
}