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 116