/* errlog.h - Debug only macros */
 * PUBLIC DOMAIN - Jon Mayo - Dec 2006
 * initial: 2006-12-29
 *
 * DIE() - ends the program with a message
 * PERROR()
 * PERROR_SOCKET() - displays errors related to sockets
 * ASSERT()
 * VERBOSE()
 * DEBUG() does nothing if NDEBUG is defined 
 * TRACE() does nothing if NTRACE is defined 
 * 
 * TODO: 
 * + use FormatMessage in the windows version of PERROR_SOCKET
 * + have a different PERROR_SOCKET if NDEBUG defined
 */

#ifndef ERRLOG_H
#define ERRLOG_H

#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
/* C99 version */
# define ERRLOG_PROLOGUE_FORMAT "%s:%d:%s():"
# define ERRLOG_PROLOGUE_ARGS __FILE__, __LINE__, __func__
#else
/* ANSI/C89 version */
# define ERRLOG_PROLOGUE_FORMAT "%s:%d:"
# define ERRLOG_PROLOGUE_ARGS __FILE__, __LINE__
#endif

/* this is used to prefix messages */
#define ERRLOG_PROLOGUE(tag) errlog(tag ERRLOG_PROLOGUE_FORMAT, ERRLOG_PROLOGUE_ARGS)

#define VERBOSE(x) do { if(errlog_level) errlog x; } while(0)
#define BUG(x, reason) do { if((x)) { errlog(ERRLOG_PROLOGUE_FORMAT "BUG:"#x":%s\n" , ERRLOG_PROLOGUE_ARGS, (reason)); } } while(0)
    

#ifdef NDEBUG
# define DEBUG(x) /* DEBUG disabled */
# define PERROR(reason) perror(reason) /* normal perror */
#define ASSERT(x) /* ASSERT disabled */
#else
/* headers needed for debugging */
# include <string.h>
# include <errno.h>
/* DEBUG() macro enabled */
# define DEBUG(x) do { ERRLOG_PROLOGUE(""); errlog x; } while(0)
/* PERROR() is a replacement for perror() that displays extra information */
# define PERROR(reason) errlog(ERRLOG_PROLOGUE_FORMAT "%s:%s (%d)\n", ERRLOG_PROLOGUE_ARGS, (reason), strerror(errno), errno)
#define ASSERT(x) do { if(!(x)) { errlog(ERRLOG_PROLOGUE_FORMAT "ASSERT:"#x"\n" , ERRLOG_PROLOGUE_ARGS); abort(); } } while(0)
#endif

#ifdef __MINGW32__
/* special version of PERROR just for socket errors */
#  define PERROR_SOCKET(reason) errlog(ERRLOG_PROLOGUE_FORMAT "%s:socket error 0x%X\n",ERRLOG_PROLOGUE_ARGS,  (reason), WSAGetLastError())
#else
#  define PERROR_SOCKET(reason) errlog(ERRLOG_PROLOGUE_FORMAT "%s:%s (%d)\n", ERRLOG_PROLOGUE_ARGS, (reason), strerror(errno), errno)
#endif

# ifdef NTRACE
#  define TRACE(x) /* TRACE disabled */
# else
#  define TRACE(x) do { ERRLOG_PROLOGUE(""); errlog x; } while(0)
# endif

/* print a message and die */
#define DIE(reason) do { PERROR(reason); exit(EXIT_FAILURE); } while(0)

extern int errlog_level; /* current logging level */
void errlog(const char *fmt, ...);

#endif
/* vim: ts=4 sts=0 noet sw=4
*/