usr.bin/xlint/common/mem.c

   1 /*      $NetBSD: mem.c,v 1.6 2003/10/22 16:10:03 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 1994, 1995 Jochen Pohl
   5  * All Rights Reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Jochen Pohl for
  18  *      The NetBSD Project.
  19  * 4. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #if HAVE_NBTOOL_CONFIG_H
  35 #include "nbtool_config.h"
  36 #endif
  37
  38 #include <sys/cdefs.h>
  39 #if defined(__RCSID) && !defined(lint)
  40 __RCSID("$NetBSD: mem.c,v 1.6 2003/10/22 16:10:03 christos Exp $");
  41 #endif
  42
  43 #include <sys/param.h>
  44 #include <sys/types.h>
  45 #include <sys/mman.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 #include "lint.h"
  50
  51 void *
  52 xmalloc(size_t s)
  53 {
  54         void    *p;
  55
  56         if ((p = malloc(s)) == NULL)
  57                 nomem();
  58         return (p);
  59 }
  60
  61 void *
  62 xcalloc(size_t n, size_t s)
  63 {
  64         void    *p;
  65
  66         if ((p = calloc(n, s)) == NULL)
  67                 nomem();
  68         return (p);
  69 }
  70
  71 void *
  72 xrealloc(void *p, size_t s)
  73 {
  74         void *n;
  75
  76         if ((n = realloc(p, s)) == NULL) {
  77                 free(p);
  78                 nomem();
  79         }
  80         p = n;
  81         return (p);
  82 }
  83
  84 char *
  85 xstrdup(const char *s)
  86 {
  87         char    *s2;
  88
  89         if ((s2 = strdup(s)) == NULL)
  90                 nomem();
  91         return (s2);
  92 }
  93
  94 void
  95 nomem(void)
  96 {
  97
  98         errx(1, "virtual memory exhausted");
  99 }
 100
 101 #if defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
 102 #define MAP_ANON        MAP_ANONYMOUS
 103 #endif
 104
 105 void *
 106 xmapalloc(size_t len)
 107 {
 108         static const int prot = PROT_READ | PROT_WRITE;
 109         static int fd = -1;
 110         void *p;
 111 #ifdef MAP_ANON
 112         static const int flags = MAP_ANON | MAP_PRIVATE;
 113 #else
 114         static const int flags = MAP_PRIVATE;
 115
 116         if (fd == -1) {
 117                 if ((fd = open("/dev/zero", O_RDWR)) == -1)
 118                         err(1, "Cannot open `/dev/zero'");
 119         }
 120 #endif
 121         p = mmap(NULL, len, prot, flags, fd, (off_t)0);
 122         if (p == (void *)-1)
 123                 err(1, "Cannot map memory for %lu bytes", (unsigned long)len);
 124         return p;
 125 }