[netwatch.git] / lib / sprintf.c

/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

#include <stdarg.h>
#include "doprnt.h"

#define SPRINTF_UNLIMITED -1
struct sprintf_state {
      char *buf;
      unsigned int len;
      unsigned int max;
};

static void
savechar(char *arg, int c)
{
        struct sprintf_state *state = (struct sprintf_state *)arg;
        
        if (state->max != SPRINTF_UNLIMITED)
        {
                if (state->len == state->max)
                        return;
        }

        state->len++;
        *state->buf = c;
        state->buf++;
}

int vsprintf(char *s, const char *fmt, va_list args)
{
        struct sprintf_state state;
        state.max = SPRINTF_UNLIMITED;
        state.len = 0;
        state.buf = s;

        _doprnt(fmt, args, 0, (void (*)()) savechar, (char *) &state);
        *(state.buf) = '\0';

        return state.len;
}

int vsnprintf(char *s, int size, const char *fmt, va_list args)
{
        struct sprintf_state state;
        state.max = size;
        state.len = 0;
        state.buf = s;

        _doprnt(fmt, args, 0, (void (*)()) savechar, (char *) &state);
        *(state.buf) = '\0';

        return state.len;
}

int sprintf(char *s, const char *fmt, ...)
{
        va_list args;
        int err;

        va_start(args, fmt);
        err = vsprintf(s, fmt, args);
        va_end(args);

        return err;
}

int snprintf(char *s, int size, const char *fmt, ...)
{
        va_list args;
        int err;

        va_start(args, fmt);
        err = vsnprintf(s, size, fmt, args);
        va_end(args);

        return err;
}