1 /* 2 * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan 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 #include <config.h> 35 36 #ifndef HAVE_VSYSLOG 37 38 #include <stdio.h> 39 #include <syslog.h> 40 #include <stdarg.h> 41 42 #include "roken.h" 43 44 /* 45 * the theory behind this is that we might be trying to call vsyslog 46 * when there's no memory left, and we should try to be as useful as 47 * possible. And the format string should say something about what's 48 * failing. 49 */ 50 51 static void 52 simple_vsyslog(int pri, const char *fmt, va_list ap) 53 { 54 syslog (pri, "%s", fmt); 55 } 56 57 /* 58 * do like syslog but with a `va_list' 59 */ 60 61 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL 62 vsyslog(int pri, const char *fmt, va_list ap) 63 { 64 char *fmt2; 65 const char *p; 66 char *p2; 67 int ret; 68 int saved_errno = errno; 69 int fmt_len = strlen (fmt); 70 int fmt2_len = fmt_len; 71 char *buf; 72 73 fmt2 = malloc (fmt_len + 1); 74 if (fmt2 == NULL) { 75 simple_vsyslog (pri, fmt, ap); 76 return; 77 } 78 79 for (p = fmt, p2 = fmt2; *p != '\0'; ++p) { 80 if (p[0] == '%' && p[1] == 'm') { 81 const char *e = strerror (saved_errno); 82 int e_len = strlen (e); 83 char *tmp; 84 int pos; 85 86 pos = p2 - fmt2; 87 fmt2_len += e_len - 2; 88 tmp = realloc (fmt2, fmt2_len + 1); 89 if (tmp == NULL) { 90 free (fmt2); 91 simple_vsyslog (pri, fmt, ap); 92 return; 93 } 94 fmt2 = tmp; 95 p2 = fmt2 + pos; 96 memmove (p2, e, e_len); 97 p2 += e_len; 98 ++p; 99 } else 100 *p2++ = *p; 101 } 102 *p2 = '\0'; 103 104 ret = vasprintf (&buf, fmt2, ap); 105 free (fmt2); 106 if (ret < 0 || buf == NULL) { 107 simple_vsyslog (pri, fmt, ap); 108 return; 109 } 110 syslog (pri, "%s", buf); 111 free (buf); 112 } 113 #endif 114