spew.h

/* 
 shm-arena    shared memory arena
 Copyright (C) 2006-2008 Lance Arsenault (LGPL v3)


    This file is part of shm-arena.

    shm-arena 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 3 of the
    License, or (at your option) any later version.

    shm-arena 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 program.  If not, see
    <http://www.gnu.org/licenses/>.
*/

#ifdef WITH_SPEW

#define _SILENT   0
#define _WARN     1
#define _INFO     2
#define _DEBUG    3

#ifdef __GNUC__
  #if __GNUC__ >= 4
    /* Don't let the library expose symbols that it does not
     * have to.  Works for newer gcc. */
    #define DLL_LOCAL  __attribute__ ((visibility("hidden")))
  #else
    #define DLL_LOCAL
  #endif
#else
  #define DLL_LOCAL
#endif


extern void _shm_spew(int level, const char *fmt, ...)
  __attribute__ ((format(printf, 2, 3)));

extern const char *_shm_spew_levels[];

extern void _shm_spew_init(void);

#ifdef TTY_COLOR
/* from spew.c */
extern const
char *_shm_tty_color[4];
/* from spew.c */
extern
int _shm_with_tty_color;

#  define  COLOR_ON(level)  ((_shm_with_tty_color)?(_shm_tty_color[(level)]):"")
#  define  COLOR_OFF        ((_shm_with_tty_color)?(_shm_tty_color[0]):"")
#else /* #ifdef TTY_COLOR */
#  define  COLOR_ON(level)  ""
#  define  COLOR_OFF ""
#endif /* #ifdef TTY_COLOR */


#define SPEW(level, fmt, ...)                       \
  (_shm_spew_init(),                            \
   _shm_spew((level), "%sSHM %s "  __FILE__ ":%d %u %lu " fmt "%s\n",   \
         COLOR_ON((level)),                     \
         _shm_spew_levels[(level)],                 \
         __LINE__, (getpid()) , pthread_self(), ##__VA_ARGS__ , \
         COLOR_OFF))


#define SPEW_SYS(level, fmt, ...)                \
  SPEW(level, fmt ": sys err %d: \"%s\"", ##__VA_ARGS__ ,    \
       errno, strerror(errno))

#define SPEW_RET(x, level, fmt, ...)                         \
  (SPEW(level, fmt , ##__VA_ARGS__) , (x))

#define SPEW_SYS_RET(x, level, fmt, ...)                     \
  (SPEW_SYS(level, fmt , ##__VA_ARGS__) , (x))

#define SPEW_SYS_ERR_RET(x, level, err_x, fmt, ...)          \
  (errno=(err_x), SPEW_SYS(level, fmt , ##__VA_ARGS__),      \
   errno=(err_x), (x))

#define SPEW_SYS_ERR(level, err_x, fmt, ...)                     \
  (errno=(err_x), SPEW_SYS(level, fmt , ##__VA_ARGS__),      \
   errno=(err_x))

#else

#define SPEW(level, fmt, ...)     /* empty macro function */
#define SPEW_SYS(level, fmt, ...) /* empty macro function */
#define SPEW_RET(x, level, fmt, ...)                 (x)
#define SPEW_SYS_RET(x, level, fmt, ...)             (x)
#define SPEW_SYS_ERR_RET(x, level, err_x, fmt, ...)  (errno=(err_x), (x))
#define SPEW_SYS_ERR(level, err_x, fmt, ...)         (errno=(err_x))

#endif