empserver/src/lib/gen/vsprintf.c

#if !defined(_WIN32)
#ifndef __STDC__

/* Portable vsprintf  by Robert A. Larson <blarson@skat.usc.edu> */

/* Copyright 1989 Robert A. Larson.
 * Distribution in any form is allowed as long as the author
 * retains credit, changes are noted by their author and the
 * copyright message remains intact.  This program comes as-is
 * with no warentee of fitness for any purpouse.
 *
 * Thanks to Doug Gwen, Chris Torek, and others who helped clarify
 * the ansi printf specs.
 *
 * Please send any bug fixes and improvments to blarson@skat.usc.edu .
 * The use of goto is NOT a bug.
 */

/* Feb	7, 1989		blarson		First usenet release */

/* This code implements the vsprintf function, without relying on
 * the existance of _doprint or other system specific code.
 *
 * Define NOVOID if void * is not a supported type.
 *
 * Two compile options are available for efficency:
 *	INTSPRINTF	should be defined if sprintf is int and returns
 *			the number of chacters formated.
 *	LONGINT		should be defined if sizeof(long) == sizeof(int)
 *
 *	They only make the code smaller and faster, they need not be
 *	defined.
 *
 * UNSIGNEDSPECIAL should be defined if unsigned is treated differently
 * than int in argument passing.  If this is definded, and LONGINT is not,
 * the compiler must support the type unsingned long.
 *
 * Most quirks and bugs of the available sprintf fuction are duplicated,
 * however * in the width and precision fields will work correctly
 * even if sprintf does not support this, as will the n format.
 *
 * Bad format strings, or those with very long width and precision
 * fields (including expanded * fields) will cause undesired results.
 */
#include "misc.h"
#include "gen.h"

#ifdef OSK			/* os9/68k can take advantage of both */
#define LONGINT
#define INTSPRINTF
#endif

#define NOVOID

/* This must be a typedef not a #define! */
#ifdef NOVOID
typedef s_char *pointer;
#else
typedef void *pointer;
#endif

#ifdef	INTSPRINTF
#define Sprintf(string,format,arg)	(sprintf((string),(format),(arg)))
#else
#define Sprintf(string,format,arg)	(\
	sprintf((string),(format),(arg)),\
	strlen(string)\
)
#endif

#include <stdarg.h>

typedef int *intp;

int
vsprintf(dest, format, args)
s_char *dest;
register s_char *format;
va_list args;
{
    register s_char *dp = dest;
    register s_char c;
    register s_char *tp;
    s_char tempfmt[64];
#ifndef LONGINT
    int longflag;
#endif

    tempfmt[0] = '%';
    while (c = *format++) {
	if (c == '%') {
	    tp = &tempfmt[1];
#ifndef LONGINT
	    longflag = 0;
#endif
	  continue_format:
	    switch (c = *format++) {
	    case 's':
		*tp++ = c;
		*tp = '\0';
		dp += Sprintf(dp, tempfmt, va_arg(args, s_char *));
		break;
	    case 'u':
	    case 'x':
	    case 'o':
	    case 'X':
#ifdef UNSIGNEDSPECIAL
		*tp++ = c;
		*tp = '\0';
#ifndef LONGINT
		if (longflag)
		    dp +=
			Sprintf(dp, tempfmt, va_arg(args, unsigned long));
		else
#endif
		    dp += Sprintf(dp, tempfmt, va_arg(args, unsigned));
		break;
#endif
	    case 'd':
	    case 'c':
	    case 'i':
		*tp++ = c;
		*tp = '\0';
#ifndef LONGINT
		if (longflag)
		    dp += Sprintf(dp, tempfmt, va_arg(args, long));
		else
#endif
		    dp += Sprintf(dp, tempfmt, va_arg(args, int));
		break;
	    case 'f':
	    case 'e':
	    case 'E':
	    case 'g':
	    case 'G':
		*tp++ = c;
		*tp = '\0';
		dp += Sprintf(dp, tempfmt, va_arg(args, double));
		break;
	    case 'p':
		*tp++ = c;
		*tp = '\0';
		dp += Sprintf(dp, tempfmt, va_arg(args, pointer));
		break;
	    case '-':
	    case '+':
	    case '0':
	    case '1':
	    case '2':
	    case '3':
	    case '4':
	    case '5':
	    case '6':
	    case '7':
	    case '8':
	    case '9':
	    case '.':
	    case ' ':
	    case '#':
	    case 'h':
		*tp++ = c;
		goto continue_format;
	    case 'l':
#ifndef LONGINT
		longflag = 1;
		*tp++ = c;
#endif
		goto continue_format;
	    case '*':
		tp += Sprintf(tp, "%d", va_arg(args, int));
		goto continue_format;
	    case 'n':
		*va_arg(args, intp) = dp - dest;
		break;
	    case '%':
	    default:
		*dp++ = c;
		break;
	    }
	} else
	    *dp++ = c;
    }
    *dp = '\0';
    return dp - dest;
}

#endif /* __STDC__ */
#endif