logging.c

   1 #define _GNU_SOURCE /* asprintf */
   2
   3 #include <stdlib.h>
   4 #include <stdarg.h>
   5 #include <stdio.h>
   6 #include <syslog.h>
   7
   8 #include "logging.h"
   9
  10 /* Do we use syslog for messages or stderr? */
  11 int logging = 0;
  12
  13 void message(const char *prefix, const char *fmt, va_list *arglist)
  14 {
  15         char *buf, *buf2;
  16
  17         vasprintf(&buf, fmt, *arglist);
  18         asprintf(&buf2, "%s%s", prefix, buf);
  19
  20         if (logging)
  21                 syslog(LOG_NOTICE, "%s", buf2);
  22         else
  23                 fprintf(stderr, "%s", buf2);
  24         free(buf2);
  25         free(buf);
  26 }
  27
  28 int warned = 0;
  29 void warn(const char *fmt, ...)
  30 {
  31         va_list arglist;
  32         warned++;
  33         va_start(arglist, fmt);
  34         message("WARNING: ", fmt, &arglist);
  35         va_end(arglist);
  36 }
  37
  38 void fatal(const char *fmt, ...)
  39 {
  40         va_list arglist;
  41         va_start(arglist, fmt);
  42         message("FATAL: ", fmt, &arglist);
  43         va_end(arglist);
  44         exit(1);
  45 }
  46