contrib/sendmail/libsm/vsprintf.c

   1 /*
   2  * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Torek.
   9  *
  10  * By using this file, you agree to the terms and conditions set
  11  * forth in the LICENSE file which can be found at the top level of
  12  * the sendmail distribution.
  13  */
  14
  15 #include <sm/gen.h>
  16 SM_RCSID("@(#)$Id: vsprintf.c,v 1.21 2001/09/11 04:04:49 gshapiro Exp $")
  17 #include <limits.h>
  18 #include <sm/io.h>
  19 #include "local.h"
  20
  21 /*
  22 **  SM_VSPRINTF -- format data for "output" into a string
  23 **
  24 **      Assigned 'str' to a "fake" file pointer. This allows common
  25 **      o/p formatting function sm_vprintf() to be used.
  26 **
  27 **      Parameters:
  28 **              str -- location for output
  29 **              fmt -- format directives
  30 **              ap -- data unit vectors for use by 'fmt'
  31 **
  32 **      Results:
  33 **              result from sm_io_vfprintf()
  34 **
  35 **      Side Effects:
  36 **              Quietly limits the size to INT_MAX though this may
  37 **              not prevent SEGV's.
  38 */
  39
  40 int
  41 sm_vsprintf(str, fmt, ap)
  42         char *str;
  43         const char *fmt;
  44         SM_VA_LOCAL_DECL
  45 {
  46         int ret;
  47         SM_FILE_T fake;
  48
  49         fake.sm_magic = SmFileMagic;
  50         fake.f_file = -1;
  51         fake.f_flags = SMWR | SMSTR;
  52         fake.f_bf.smb_base = fake.f_p = (unsigned char *)str;
  53         fake.f_bf.smb_size = fake.f_w = INT_MAX;
  54         fake.f_timeout = SM_TIME_FOREVER;
  55         fake.f_timeoutstate = SM_TIME_BLOCK;
  56         fake.f_close = NULL;
  57         fake.f_open = NULL;
  58         fake.f_read = NULL;
  59         fake.f_write = NULL;
  60         fake.f_seek = NULL;
  61         fake.f_setinfo = fake.f_getinfo = NULL;
  62         fake.f_type = "sm_vsprintf:fake";
  63         ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap);
  64         *fake.f_p = '\0';
  65         return ret;
  66 }