1 /* 2 * Copyright 2016 Jakub Klama <jceel@FreeBSD.org> 3 * All rights reserved 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted providing that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 24 * POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28 #include <stdio.h> 29 #include <stdlib.h> 30 #include <stdarg.h> 31 #include <string.h> 32 #include "log.h" 33 34 static const char *l9p_log_level_names[] = { 35 "DEBUG", 36 "INFO", 37 "WARN", 38 "ERROR" 39 }; 40 41 void 42 l9p_logf(enum l9p_log_level level, const char *func, const char *fmt, ...) 43 { 44 const char *dest = NULL; 45 static FILE *stream = NULL; 46 va_list ap; 47 48 if (stream == NULL) { 49 dest = getenv("LIB9P_LOGGING"); 50 if (dest == NULL) 51 return; 52 else if (!strcmp(dest, "stderr")) 53 stream = stderr; 54 else { 55 stream = fopen(dest, "a"); 56 if (stream == NULL) 57 return; 58 } 59 } 60 61 va_start(ap, fmt); 62 fprintf(stream, "[%s]\t %s: ", l9p_log_level_names[level], func); 63 vfprintf(stream, fmt, ap); 64 fprintf(stream, "\n"); 65 fflush(stream); 66 va_end(ap); 67 } 68