text: /*
   * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
   *      All rights reserved.
   * Copyright (c) 1990, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Chris Torek.
   *
   * By using this file, you agree to the terms and conditions set
   * forth in the LICENSE file which can be found at the top level of
   * the sendmail distribution.
   */
  
  #include <sm/gen.h>
  SM_RCSID("@(#)$Id: snprintf.c,v 1.24 2006/10/12 21:50:10 ca Exp $")
  #include <limits.h>
  #include <sm/varargs.h>
  #include <sm/io.h>
  #include <sm/string.h>
  #include "local.h"
  
  /*
  **  SM_SNPRINTF -- format a string to a memory location of restricted size
  **
  **	Parameters:
  **		str -- memory location to place formatted string
  **		n -- size of buffer pointed to by str, capped to
  **			a maximum of INT_MAX
  **		fmt -- the formatting directives
  **		... -- the data to satisfy the formatting
  **
  **	Returns:
  **		Failure: -1
  **		Success: number of bytes that would have been written
  **			to str, not including the trailing '\0',
  **			up to a maximum of INT_MAX, as if there was
  **			no buffer size limitation.  If the result >= n
  **			then the output was truncated.
  **
  **	Side Effects:
  **		If n > 0, then between 0 and n-1 bytes of formatted output
  **		are written into 'str', followed by a '\0'.
  */
  
  int
  #if SM_VA_STD
  sm_snprintf(char *str, size_t n, char const *fmt, ...)
  #else /* SM_VA_STD */
  sm_snprintf(str, n, fmt, va_alist)
  	char *str;
  	size_t n;
  	char *fmt;
  	va_dcl
  #endif /* SM_VA_STD */
  {
  	int ret;
  	SM_VA_LOCAL_DECL
  	SM_FILE_T fake;
  
  	/* While snprintf(3) specifies size_t stdio uses an int internally */
  	if (n > INT_MAX)
  		n = INT_MAX;
  	SM_VA_START(ap, fmt);
  
  	/* XXX put this into a static? */
  	fake.sm_magic = SmFileMagic;
  	fake.f_file = -1;
  	fake.f_flags = SMWR | SMSTR;
  	fake.f_cookie = &fake;
  	fake.f_bf.smb_base = fake.f_p = (unsigned char *)str;
  	fake.f_bf.smb_size = fake.f_w = n ? n - 1 : 0;
  	fake.f_timeout = SM_TIME_FOREVER;
  	fake.f_timeoutstate = SM_TIME_BLOCK;
  	fake.f_close = NULL;
  	fake.f_open = NULL;
  	fake.f_read = NULL;
  	fake.f_write = NULL;
  	fake.f_seek = NULL;
  	fake.f_setinfo = fake.f_getinfo = NULL;
  	fake.f_type = "sm_snprintf:fake";
  	ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap);
  	if (n > 0)
  		*fake.f_p = '\0';
  	SM_VA_END(ap);
  	return ret;
  }
  