lib/util.c

   1 /* Copyright 1998 by Andi Kleen. Subject to the GPL. */
   2 /* $Id: util.c,v 1.4 1998/11/17 15:17:02 freitag Exp $ */
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <sys/utsname.h>
   7
   8 #include "util.h"
   9
  10
  11 static void oom(void)
  12 {
  13     fprintf(stderr, "out of virtual memory\n");
  14     exit(2);
  15 }
  16
  17 void *xmalloc(size_t sz)
  18 {
  19     void *p = calloc(sz, 1);
  20     if (!p)
  21         oom();
  22     return p;
  23 }
  24
  25 void *xrealloc(void *oldp, size_t sz)
  26 {
  27     void *p = realloc(oldp, sz);
  28     if (!p)
  29         oom();
  30     return p;
  31 }
  32
  33 int kernel_version(void)
  34 {
  35     struct utsname uts;
  36     int major, minor, patch;
  37
  38     if (uname(&uts) < 0)
  39         return -1;
  40     if (sscanf(uts.release, "%d.%d.%d", &major, &minor, &patch) != 3)
  41         return -1;
  42     return KRELEASE(major, minor, patch);
  43 }
  44
  45
  46 /* Like strncpy but make sure the resulting string is always 0 terminated. */
  47 char *safe_strncpy(char *dst, const char *src, size_t size)
  48 {
  49     dst[size-1] = '\0';
  50     return strncpy(dst,src,size-1);
  51 }