zbar_debug.h

00001 /*------------------------------------------------------------------------
00002  *  Copyright 2007-2009 (c) Jeff Brown <spadix@users.sourceforge.net>
00003  *
00004  *  This file is part of the ZBar Bar Code Reader.
00005  *
00006  *  The ZBar Bar Code Reader is free software; you can redistribute it
00007  *  and/or modify it under the terms of the GNU Lesser Public License as
00008  *  published by the Free Software Foundation; either version 2.1 of
00009  *  the License, or (at your option) any later version.
00010  *
00011  *  The ZBar Bar Code Reader is distributed in the hope that it will be
00012  *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty
00013  *  of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  *  GNU Lesser Public License for more details.
00015  *
00016  *  You should have received a copy of the GNU Lesser Public License
00017  *  along with the ZBar Bar Code Reader; if not, write to the Free
00018  *  Software Foundation, Inc., 51 Franklin St, Fifth Floor,
00019  *  Boston, MA  02110-1301  USA
00020  *
00021  *  http://sourceforge.net/projects/zbar
00022  *------------------------------------------------------------------------*/
00023 
00024 /* varargs variations on compile time debug spew */
00025 
00026 #ifndef DEBUG_LEVEL
00027 
00028 # ifdef __GNUC__
00029     /* older versions of gcc (< 2.95) require a named varargs parameter */
00030 #  define dprintf(args...)
00031 # else
00032     /* unfortunately named vararg parameter is a gcc-specific extension */
00033 #  define dprintf(...)
00034 # endif
00035 
00036 #else
00037 
00038 # include <stdio.h>
00039 
00040 # ifdef __GNUC__
00041 #  define dprintf(level, args...) \
00042     if((level) <= DEBUG_LEVEL)    \
00043         fprintf(stderr, args)
00044 # else
00045 #  define dprintf(level, ...)     \
00046     if((level) <= DEBUG_LEVEL)    \
00047         fprintf(stderr, __VA_ARGS__)
00048 # endif
00049 
00050 #endif /* DEBUG_LEVEL */
00051 
00052 /* spew warnings for non-fatal assertions.
00053  * returns specified error code if assertion fails.
00054  * NB check/return is still performed for NDEBUG
00055  * only the message is inhibited
00056  * FIXME don't we need varargs hacks here?
00057  */
00058 #ifndef NDEBUG
00059 
00060 # include <stdio.h>
00061 
00062 #if __STDC_VERSION__ < 199901L && !defined(__func__)
00063 # if __GNUC__ >= 2
00064 #  define __func__ __FUNCTION__
00065 # else
00066 #  define __func__ "<unknown>"
00067 # endif
00068 #endif
00069 
00070 # define zassert(condition, retval, format, ...) do {                   \
00071         if(!(condition)) {                                              \
00072             fprintf(stderr, "WARNING: %s:%d: %s:"                       \
00073                     " Assertion \"%s\" failed.\n\t" format,             \
00074                     __FILE__, __LINE__, __func__, #condition ,          \
00075                     ##__VA_ARGS__);                                     \
00076             return(retval);                                             \
00077         }                                                               \
00078     } while(0)
00079 
00080 #else
00081 
00082 # define zassert(condition, retval, format, ...) do {   \
00083         if(!(condition))                                \
00084             return(retval);                             \
00085     } while(0)
00086 
00087 #endif
00088