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asprintf.c

/* $Id: asprintf.c,v 1.2 2006/12/09 20:43:57 nicm Exp $ */

/*
 * Copyright (c) 2006 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

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

#include "logfmon.h"

int
asprintf(char **ret, const char *format, ...)
{
      va_list     ap;
      int   n;

      va_start(ap, format);
      n = vasprintf(ret, format, ap);
      va_end(ap);

      return (n);
}

int
vasprintf(char **ret, const char *format, va_list ap)
{
      int    n;

      if ((n = vsnprintf(NULL, 0, format, ap)) < 0)
            goto error;

      *ret = xmalloc(n + 1);
      if ((n = vsnprintf(*ret, n + 1, format, ap)) < 0) {
            xfree(*ret);
            goto error;
      }

      return (n);

error:
      *ret = NULL;
      return (-1);
}

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