util.c

   1 /* util.c - util functions */
   2
   3 /* Copyright (C) 2007 Keith Rarick and Philotic Inc.
   4
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <errno.h>
  20 #include <stdarg.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <sys/time.h>
  25
  26 #include "util.h"
  27
  28 char *progname; /* defined as extern in util.h */
  29
  30 void
  31 v()
  32 {
  33 }
  34
  35 static void
  36 vwarnx(const char *err, const char *fmt, va_list args)
  37 {
  38     fprintf(stderr, "%s: ", progname);
  39     if (fmt) {
  40         vfprintf(stderr, fmt, args);
  41         if (err) fprintf(stderr, ": %s", strerror(errno));
  42     }
  43     fputc('\n', stderr);
  44 }
  45
  46 void
  47 warn(const char *fmt, ...)
  48 {
  49     va_list args;
  50     va_start(args, fmt);
  51     vwarnx(strerror(errno), fmt, args);
  52     va_end(args);
  53 }
  54
  55 void
  56 warnx(const char *fmt, ...)
  57 {
  58     va_list args;
  59     va_start(args, fmt);
  60     vwarnx(NULL, fmt, args);
  61     va_end(args);
  62 }
  63
  64 usec
  65 usec_from_timeval(struct timeval *tv)
  66 {
  67     return ((usec) tv->tv_sec) * SECOND + tv->tv_usec;
  68 }
  69
  70 void
  71 timeval_from_usec(struct timeval *tv, usec t)
  72 {
  73     tv->tv_sec = t / SECOND;
  74     tv->tv_usec = t % SECOND;
  75 }
  76
  77 usec
  78 now_usec(void)
  79 {
  80     int r;
  81     struct timeval tv;
  82
  83     r = gettimeofday(&tv, 0);
  84     if (r != 0) return warnx("gettimeofday"), -1; // can't happen
  85
  86     return usec_from_timeval(&tv);
  87 }
  88