/alsa-lib/src/error.c
C | 179 lines | 87 code | 14 blank | 78 comment | 13 complexity | 2161c0924b9d59f517253435f0fea2f8 MD5 | raw file
Possible License(s): LGPL-2.1, GPL-2.0
- /**
- * \file error.c
- * \brief Error code handling routines
- * \author Jaroslav Kysela <perex@perex.cz>
- * \date 1998-2001
- *
- * Error code handling routines.
- */
- /*
- * Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz>
- *
- * snd_strerror routine needs to be recoded for the locale support
- *
- *
- * This library is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as
- * published by the Free Software Foundation; either version 2.1 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <stdarg.h>
- #include <string.h>
- #include "local.h"
- /**
- * Array of error codes in US ASCII.
- */
- static const char *snd_error_codes[] =
- {
- "Sound protocol is not compatible"
- };
- /**
- * \brief Returns the message for an error code.
- * \param errnum The error code number, which must be a system error code
- * or an ALSA error code.
- * \return The ASCII description of the given numeric error code.
- */
- const char *snd_strerror(int errnum)
- {
- if (errnum < 0)
- errnum = -errnum;
- if (errnum < SND_ERROR_BEGIN)
- return (const char *) strerror(errnum);
- errnum -= SND_ERROR_BEGIN;
- if ((unsigned int) errnum >= sizeof(snd_error_codes) / sizeof(const char *))
- return "Unknown error";
- return snd_error_codes[errnum];
- }
- #ifndef DOC_HIDDEN
- #ifdef HAVE___THREAD
- #define TLS_PFX __thread
- #else
- #define TLS_PFX /* NOP */
- #endif
- #endif
- static TLS_PFX snd_local_error_handler_t local_error = NULL;
- /**
- * \brief Install local error handler
- * \param func The local error handler function
- * \retval Previous local error handler function
- */
- snd_local_error_handler_t snd_lib_error_set_local(snd_local_error_handler_t func)
- {
- snd_local_error_handler_t old = local_error;
- local_error = func;
- return old;
- }
- /**
- * \brief The default error handler function.
- * \param file The filename where the error was hit.
- * \param line The line number.
- * \param function The function name.
- * \param err The error code.
- * \param fmt The message (including the format characters).
- * \param ... Optional arguments.
- *
- * If a local error function has been installed for the current thread by
- * \ref snd_lib_error_set_local, it is called. Otherwise, prints the error
- * message including location to \c stderr.
- */
- static void snd_lib_error_default(const char *file, int line, const char *function, int err, const char *fmt, ...)
- {
- va_list arg;
- va_start(arg, fmt);
- if (local_error) {
- local_error(file, line, function, err, fmt, arg);
- va_end(arg);
- return;
- }
- fprintf(stderr, "ALSA lib %s:%i:(%s) ", file, line, function);
- vfprintf(stderr, fmt, arg);
- if (err)
- fprintf(stderr, ": %s", snd_strerror(err));
- putc('\n', stderr);
- va_end(arg);
- }
- /**
- * \ingroup Error
- * Pointer to the error handler function.
- * For internal use only.
- */
- snd_lib_error_handler_t snd_lib_error = snd_lib_error_default;
- /**
- * \brief Sets the error handler.
- * \param handler The pointer to the new error handler function.
- *
- * This function sets a new error handler, or (if \c handler is \c NULL)
- * the default one which prints the error messages to \c stderr.
- */
- int snd_lib_error_set_handler(snd_lib_error_handler_t handler)
- {
- snd_lib_error = handler == NULL ? snd_lib_error_default : handler;
- #ifndef NDEBUG
- if (snd_lib_error != snd_lib_error_default)
- snd_err_msg = snd_lib_error;
- #endif
- return 0;
- }
- /**
- * \brief Returns the ALSA sound library version in ASCII format
- * \return The ASCII description of the used ALSA sound library.
- */
- const char *snd_asoundlib_version(void)
- {
- return SND_LIB_VERSION_STR;
- }
- #ifndef NDEBUG
- /*
- * internal error handling
- */
- static void snd_err_msg_default(const char *file, int line, const char *function, int err, const char *fmt, ...)
- {
- va_list arg;
- const char *verbose;
-
- verbose = getenv("LIBASOUND_DEBUG");
- if (! verbose || ! *verbose)
- return;
- va_start(arg, fmt);
- fprintf(stderr, "ALSA lib %s:%i:(%s) ", file, line, function);
- vfprintf(stderr, fmt, arg);
- if (err)
- fprintf(stderr, ": %s", snd_strerror(err));
- putc('\n', stderr);
- va_end(arg);
- #ifdef ALSA_DEBUG_ASSERT
- verbose = getenv("LIBASOUND_DEBUG_ASSERT");
- if (verbose && *verbose)
- assert(0);
- #endif
- }
- /**
- * The ALSA error message handler
- */
- snd_lib_error_handler_t snd_err_msg = snd_err_msg_default;
- #endif