1 /* 2 * Copyright (c) 1995 - 2000 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 RCSID("$Id: vsyslog.c 14773 2005-04-12 11:29:18Z lha $"); 37 #endif 38 39 #ifndef HAVE_VSYSLOG 40 41 #include <stdio.h> 42 #include <syslog.h> 43 #include <stdarg.h> 44 45 #include "roken.h" 46 47 /* 48 * the theory behind this is that we might be trying to call vsyslog 49 * when there's no memory left, and we should try to be as useful as 50 * possible. And the format string should say something about what's 51 * failing. 52 */ 53 54 static void 55 simple_vsyslog(int pri, const char *fmt, va_list ap) 56 { 57 syslog (pri, "%s", fmt); 58 } 59 60 /* 61 * do like syslog but with a `va_list' 62 */ 63 64 void ROKEN_LIB_FUNCTION 65 vsyslog(int pri, const char *fmt, va_list ap) 66 { 67 char *fmt2; 68 const char *p; 69 char *p2; 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 vasprintf (&buf, fmt2, ap); 107 free (fmt2); 108 if (buf == NULL) { 109 simple_vsyslog (pri, fmt, ap); 110 return; 111 } 112 syslog (pri, "%s", buf); 113 free (buf); 114 } 115 #endif 116