crypto/external/bsd/heimdal/dist/lib/roken/vsyslog.c

   1 /*      $NetBSD: vsyslog.c,v 1.1.1.1 2011/04/13 18:15:44 elric Exp $    */
   2
   3 /*
   4  * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <config.h>
  37
  38 #ifndef HAVE_VSYSLOG
  39
  40 #include <stdio.h>
  41 #include <syslog.h>
  42 #include <stdarg.h>
  43
  44 #include <krb5/roken.h>
  45
  46 /*
  47  * the theory behind this is that we might be trying to call vsyslog
  48  * when there's no memory left, and we should try to be as useful as
  49  * possible.  And the format string should say something about what's
  50  * failing.
  51  */
  52
  53 static void
  54 simple_vsyslog(int pri, const char *fmt, va_list ap)
  55 {
  56     syslog (pri, "%s", fmt);
  57 }
  58
  59 /*
  60  * do like syslog but with a `va_list'
  61  */
  62
  63 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
  64 vsyslog(int pri, const char *fmt, va_list ap)
  65 {
  66     char *fmt2;
  67     const char *p;
  68     char *p2;
  69     int ret;
  70     int saved_errno = errno;
  71     int fmt_len  = strlen (fmt);
  72     int fmt2_len = fmt_len;
  73     char *buf;
  74
  75     fmt2 = malloc (fmt_len + 1);
  76     if (fmt2 == NULL) {
  77         simple_vsyslog (pri, fmt, ap);
  78         return;
  79     }
  80
  81     for (p = fmt, p2 = fmt2; *p != '\0'; ++p) {
  82         if (p[0] == '%' && p[1] == 'm') {
  83             const char *e = strerror (saved_errno);
  84             int e_len = strlen (e);
  85             char *tmp;
  86             int pos;
  87
  88             pos = p2 - fmt2;
  89             fmt2_len += e_len - 2;
  90             tmp = realloc (fmt2, fmt2_len + 1);
  91             if (tmp == NULL) {
  92                 free (fmt2);
  93                 simple_vsyslog (pri, fmt, ap);
  94                 return;
  95             }
  96             fmt2 = tmp;
  97             p2   = fmt2 + pos;
  98             memmove (p2, e, e_len);
  99             p2 += e_len;
 100             ++p;
 101         } else
 102             *p2++ = *p;
 103     }
 104     *p2 = '\0';
 105
 106     ret = vasprintf (&buf, fmt2, ap);
 107     free (fmt2);
 108     if (ret < 0 || buf == NULL) {
 109         simple_vsyslog (pri, fmt, ap);
 110         return;
 111     }
 112     syslog (pri, "%s", buf);
 113     free (buf);
 114 }
 115 #endif