usr/src/lib/cfgadm_plugins/ac/common/mema_util.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <stddef.h>
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <stdarg.h>
  33 #include <string.h>
  34 #include <locale.h>
  35 #include <sys/param.h>
  36 #include <config_admin.h>
  37 #include "mema_util.h"
  38
  39 /*
  40  * The libmemadm routines can return arbitrary error strings.  As the
  41  * calling program does not know how long these errors might be,
  42  * the library routines must allocate the required space and the
  43  * calling program must deallocate it.
  44  *
  45  * This routine povides a printf-like interface for creating the
  46  * error strings.
  47  */
  48
  49 #define FMT_STR_SLOP            (16)
  50
  51 void
  52 __fmt_errstring(
  53         char **errstring,
  54         size_t extra_length_hint,
  55         const char *fmt,
  56         ...)
  57 {
  58         char *ebuf;
  59         size_t elen;
  60         va_list ap;
  61
  62         /*
  63          * If no errors required or error already set, return.
  64          */
  65         if ((errstring == NULL) || (*errstring != NULL))
  66                 return;
  67
  68         elen = strlen(fmt) + extra_length_hint + FMT_STR_SLOP;
  69
  70         if ((ebuf = (char *)malloc(elen + 1)) == NULL)
  71                 return;
  72
  73         va_start(ap, fmt);
  74         (void) vsprintf(ebuf, fmt, ap);
  75         va_end(ap);
  76
  77         if (strlen(ebuf) > elen)
  78                 abort();
  79
  80         *errstring = ebuf;
  81 }