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         int ret;
  16         char *buf, *buf2;
  17
  18         ret = vasprintf(&buf, fmt, *arglist);
  19         if (ret >= 0)
  20                 ret = asprintf(&buf2, "%s%s", prefix, buf);
  21
  22         if (ret < 0)
  23                 buf2 = "FATAL: Out of memory.\n";
  24
  25         if (logging)
  26                 syslog(LOG_NOTICE, "%s", buf2);
  27         else
  28                 fprintf(stderr, "%s", buf2);
  29
  30         if (ret < 0)
  31                 exit(1);
  32
  33         free(buf2);
  34         free(buf);
  35 }
  36
  37 int warned = 0;
  38 void warn(const char *fmt, ...)
  39 {
  40         va_list arglist;
  41         warned++;
  42         va_start(arglist, fmt);
  43         message("WARNING: ", fmt, &arglist);
  44         va_end(arglist);
  45 }
  46
  47 void fatal(const char *fmt, ...)
  48 {
  49         va_list arglist;
  50         va_start(arglist, fmt);
  51         message("FATAL: ", fmt, &arglist);
  52         va_end(arglist);
  53         exit(1);
  54 }
  55