kc3-lang/libressl/crypto/compat/bsd-asprintf.c

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• Hash : a4cc9539
  Author :
  Date : 2014-10-29T15:44:36
  

  Improve and simplify function and header detection logic.
  
  Simplify autoconf checks by using AC_CHECK_FUNCS/HEADERS.
  Clarify some ambiguous dependencies around strnlen/strndup.
  Unconditionally enable pidwraptest for all arc4random implementations.
  Remove HAVE_VASPRINTF conditional, since asprintf requires vasprintf.
  
  ok @doug
  

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• crypto/compat/bsd-asprintf.c

• /*
   * Copyright (c) 2004 Darren Tucker.
   *
   * Based originally on asprintf.c from OpenBSD:
   * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
   *
   * 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 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.
   */
  
  #ifndef HAVE_ASPRINTF
  
  #include <errno.h>
  #include <limits.h> /* for INT_MAX */
  #include <stdarg.h>
  #include <stdio.h> /* for vsnprintf */
  #include <stdlib.h>
  
  #ifndef VA_COPY
  # ifdef HAVE_VA_COPY
  #  define VA_COPY(dest, src) va_copy(dest, src)
  # else
  #  ifdef HAVE___VA_COPY
  #   define VA_COPY(dest, src) __va_copy(dest, src)
  #  else
  #   define VA_COPY(dest, src) (dest) = (src)
  #  endif
  # endif
  #endif
  
  #define INIT_SZ	128
  
  int
  vasprintf(char **str, const char *fmt, va_list ap)
  {
  	int ret;
  	va_list ap2;
  	char *string, *newstr;
  	size_t len;
  
  	if ((string = malloc(INIT_SZ)) == NULL)
  		goto fail;
  
  	VA_COPY(ap2, ap);
  	ret = vsnprintf(string, INIT_SZ, fmt, ap2);
  	va_end(ap2);
  	if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
  		*str = string;
  	} else if (ret == INT_MAX || ret < 0) { /* Bad length */
  		free(string);
  		goto fail;
  	} else {	/* bigger than initial, realloc allowing for nul */
  		len = (size_t)ret + 1;
  		if ((newstr = realloc(string, len)) == NULL) {
  			free(string);
  			goto fail;
  		}
  		VA_COPY(ap2, ap);
  		ret = vsnprintf(newstr, len, fmt, ap2);
  		va_end(ap2);
  		if (ret < 0 || (size_t)ret >= len) { /* failed with realloc'ed string */
  			free(newstr);
  			goto fail;
  		}
  		*str = newstr;
  	}
  	return (ret);
  
  fail:
  	*str = NULL;
  	errno = ENOMEM;
  	return (-1);
  }
  
  int asprintf(char **str, const char *fmt, ...)
  {
  	va_list ap;
  	int ret;
  	
  	*str = NULL;
  	va_start(ap, fmt);
  	ret = vasprintf(str, fmt, ap);
  	va_end(ap);
  
  	return ret;
  }
  #endif
  

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