1 /** 2 * \file error.c 3 * \brief Error code handling routines 4 * \author Jaroslav Kysela <perex (at) perex.cz> 5 * \date 1998-2001 6 * 7 * Error code handling routines. 8 */ 9 /* 10 * Copyright (c) 1998 by Jaroslav Kysela <perex (at) perex.cz> 11 * 12 * snd_strerror routine needs to be recoded for the locale support 13 * 14 * 15 * This library is free software; you can redistribute it and/or modify 16 * it under the terms of the GNU Lesser General Public License as 17 * published by the Free Software Foundation; either version 2.1 of 18 * the License, or (at your option) any later version. 19 * 20 * This program is distributed in the hope that it will be useful, 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 23 * GNU Lesser General Public License for more details. 24 * 25 * You should have received a copy of the GNU Lesser General Public 26 * License along with this library; if not, write to the Free Software 27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 28 * 29 */ 30 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <stdarg.h> 34 #include <string.h> 35 #include "local.h" 36 37 /** 38 * Array of error codes in US ASCII. 39 */ 40 static const char *snd_error_codes[] = 41 { 42 "Sound protocol is not compatible" 43 }; 44 45 /** 46 * \brief Returns the message for an error code. 47 * \param errnum The error code number, which must be a system error code 48 * or an ALSA error code. 49 * \return The ASCII description of the given numeric error code. 50 */ 51 const char *snd_strerror(int errnum) 52 { 53 if (errnum < 0) 54 errnum = -errnum; 55 if (errnum < SND_ERROR_BEGIN) 56 return (const char *) strerror(errnum); 57 errnum -= SND_ERROR_BEGIN; 58 if ((unsigned int) errnum >= sizeof(snd_error_codes) / sizeof(const char *)) 59 return "Unknown error"; 60 return snd_error_codes[errnum]; 61 } 62 63 /** 64 * \brief The default error handler function. 65 * \param file The filename where the error was hit. 66 * \param line The line number. 67 * \param function The function name. 68 * \param err The error code. 69 * \param fmt The message (including the format characters). 70 * \param ... Optional arguments. 71 * 72 * Prints the error message including location to \c stderr. 73 */ 74 static void snd_lib_error_default(const char *file, int line, const char *function, int err, const char *fmt, ...) 75 { 76 va_list arg; 77 va_start(arg, fmt); 78 fprintf(stderr, "ALSA lib %s:%i:(%s) ", file, line, function); 79 vfprintf(stderr, fmt, arg); 80 if (err) 81 fprintf(stderr, ": %s", snd_strerror(err)); 82 putc('\n', stderr); 83 va_end(arg); 84 } 85 86 /** 87 * \ingroup Error 88 * Pointer to the error handler function. 89 * For internal use only. 90 */ 91 snd_lib_error_handler_t snd_lib_error = snd_lib_error_default; 92 93 /** 94 * \brief Sets the error handler. 95 * \param handler The pointer to the new error handler function. 96 * 97 * This function sets a new error handler, or (if \c handler is \c NULL) 98 * the default one which prints the error messages to \c stderr. 99 */ 100 int snd_lib_error_set_handler(snd_lib_error_handler_t handler) 101 { 102 snd_lib_error = handler == NULL ? snd_lib_error_default : handler; 103 #ifndef NDEBUG 104 if (snd_lib_error != snd_lib_error_default) 105 snd_err_msg = snd_lib_error; 106 #endif 107 return 0; 108 } 109 110 /** 111 * \brief Returns the ALSA sound library version in ASCII format 112 * \return The ASCII description of the used ALSA sound library. 113 */ 114 const char *snd_asoundlib_version(void) 115 { 116 return SND_LIB_VERSION_STR; 117 } 118 119 #ifndef NDEBUG 120 /* 121 * internal error handling 122 */ 123 static void snd_err_msg_default(const char *file, int line, const char *function, int err, const char *fmt, ...) 124 { 125 va_list arg; 126 const char *verbose; 127 128 verbose = getenv("LIBASOUND_DEBUG"); 129 if (! verbose || ! *verbose) 130 return; 131 va_start(arg, fmt); 132 fprintf(stderr, "ALSA lib %s:%i:(%s) ", file, line, function); 133 vfprintf(stderr, fmt, arg); 134 if (err) 135 fprintf(stderr, ": %s", snd_strerror(err)); 136 putc('\n', stderr); 137 va_end(arg); 138 #ifdef ALSA_DEBUG_ASSERT 139 verbose = getenv("LIBASOUND_DEBUG_ASSERT"); 140 if (verbose && *verbose) 141 assert(0); 142 #endif 143 } 144 145 /** 146 * The ALSA error message handler 147 */ 148 snd_lib_error_handler_t snd_err_msg = snd_err_msg_default; 149 150 #endif 151
