msg.h

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/* c 2009 Andrew I. Schein  -*- c++ -*- */

#ifndef NPS_MSG_H
#define NPS_MSG

#include <stdarg.h>
#include <string.h> /* strerror */
#include <errno.h>


#define DIE die=1 ; val=0
#define WRN wrn=1 ; val=0
#define ABT abt=1 ; val=0

/* MSG_ is not for customization... it is for shortening code in msg.h and msg.c */
#define MSG_(x) nps_msg_##x

void MSG_(die)(long code,const char *file,const long line,const char *s,...);

static long MSG_(level); /* threshold for printing warnings */
/* 
   DIE-N - exit with error code N after printing message.
   WRN-N - level N indicates a threshold for actually printing the warning.
   ABT   - abort() after printing message.
   example: MSG(DIE-1,"bad file name: %s.\n",filename);                   */

#define MSG(level_statement,args...) {                                  \
    long die=0,wrn=0,abt=0,val=0;                                       \
    level_statement; /* e.g. DIE-1 => die=1;val=0-1; */                 \
    val = (val >= 0 ? val : -val);                                      \
    if (die)      { nps_msg_die(val,__FILE__,__LINE__, ##args); }       \
    else if (wrn) { nps_msg_wrn(val,__FILE__,__LINE__, ##args); }       \
    else if (abt && !val) { nps_msg_die(0, __FILE__, __LINE__,##args); } \
    else {                                                              \
      fprintf(stderr,"ill-formed MSG... %s:%d\n",__FILE__,__LINE__);    \
      abort();                                                          \
    }                                                                   \
  }                                                                     \
    
/* ZOD(res = malloc(1 << 10)); 
   "Zero or Die" if 0, print string for errno code and abort.
   This is useful for functions like malloc that set errno on failure. */
#define ZOD(x) {                                                        \
    char errsert_msg[2048];                                              \
    if ((x)) MSG(DIE-1,"%s in %s:%d\n", strerror_r(errno,errsert_msg,256),__FILE__,__LINE__); \
  }
/* "Die on Zero" */
#define DOZ(x) {                                                        \
    char errsert_msg[2048];                                              \
    if (!(x)) MSG(DIE-1,"%s in %s:%d\n", strerror_r(errno,errsert_msg,256),__FILE__,__LINE__); \
  }

#ifndef NPS_MSG_KEEP
#include "msg_undef.h"
#endif
#endif /* NPS_MSG_H */

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