utils.c

   1 /*
   2  * Copyright (c) 2015 Mohamed Aslan <maslan@sce.carleton.ca>
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <stdarg.h>
  20 #include <err.h>
  21 #include "utils.h"
  22
  23 void *
  24 xmalloc(size_t size)
  25 {
  26         void *ptr;
  27
  28         if ((ptr = malloc(size)) == NULL)
  29                 err(1, "malloc %zu", size);
  30         return ptr;
  31 }
  32
  33 void *
  34 xcalloc(size_t nmemb, size_t size)
  35 {
  36         void *ptr;
  37
  38         if ((ptr = calloc(nmemb, size)) == NULL)
  39                 err(1, "calloc %zu", size);
  40         return ptr;
  41 }
  42
  43 void
  44 f_log(FILE *lg, const char *fmt, ...)
  45 {
  46         va_list                 ap;
  47
  48         if (!lg)
  49                 return;
  50         va_start(ap, fmt);
  51         if (vfprintf(lg, fmt, ap) < -1)
  52                 errx(1, "vfprintf");
  53         va_end(ap);
  54         fflush(lg);
  55 }
  56
  57 uint64_t
  58 dpid_aton(const char *str)
  59 {
  60         int                     i, ret, digits[8];
  61         uint64_t                dpid = 0;
  62
  63         ret = sscanf(str, "%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x", &digits[0],
  64                 &digits[1], &digits[2], &digits[3], &digits[4], &digits[5],
  65                 &digits[6], &digits[7]);
  66         if (ret != 8)
  67                 return 0;
  68         for (i = 0 ; i < 8 ; i++) {
  69                 dpid <<= 8;
  70                 dpid |= digits[i];
  71         }
  72         return dpid;
  73 }