app/xmalloc.c

   1 /*
   2  * Lightweight Autonomic Network Architecture
   3  * Copyright 2011 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
   4  * Swiss federal institute of technology (ETH Zurich)
   5  * Subject to the GPL.
   6  */
   7
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <malloc.h>
  14
  15 #ifndef SIZE_T_MAX
  16 # define SIZE_T_MAX  ((size_t) ~0)
  17 #endif
  18
  19 #include "compiler.h"
  20 #include "xmalloc.h"
  21 #include "strlcpy.h"
  22 #include "die.h"
  23
  24 __hidden void *xmalloc(size_t size)
  25 {
  26         void *ptr;
  27         if (size == 0)
  28                 panic("xmalloc: zero size\n");
  29         ptr = malloc(size);
  30         if (ptr == NULL)
  31                 panic("xmalloc: out of memory (allocating %zu bytes)\n", size);
  32         return ptr;
  33 }
  34
  35 __hidden void *xvalloc(size_t size)
  36 {
  37         void *ptr;
  38         if (size == 0)
  39                 panic("xmalloc: zero size\n");
  40         ptr = valloc(size);
  41         if (ptr == NULL)
  42                 panic("xvalloc: out of memory (allocating %zu bytes)\n", size);
  43         return ptr;
  44 }
  45
  46 __hidden void *xzmalloc(size_t size)
  47 {
  48         void *ptr;
  49         if (size == 0)
  50                 panic("xzmalloc: zero size\n");
  51         ptr = malloc(size);
  52         if (ptr == NULL)
  53                 panic("xzmalloc: out of memory (allocating %zu bytes)\n", size);
  54         memset(ptr, 0, size);
  55         return ptr;
  56 }
  57
  58 __hidden void *xmalloc_aligned(size_t size, size_t alignment)
  59 {
  60         int ret;
  61         void *ptr;
  62         if (size == 0)
  63                 panic("xmalloc_aligned: zero size\n");
  64         ret = posix_memalign(&ptr, alignment, size);
  65         if (ret != 0)
  66                 panic("xmalloc_aligned: out of memory (allocating %zu bytes)\n",
  67                       size);
  68         return ptr;
  69 }
  70
  71 __hidden void *xmallocz(size_t size)
  72 {
  73         void *ptr;
  74         if (size + 1 < size)
  75                 panic("xmallocz: data too large to fit "
  76                       "into virtual memory space\n");
  77         ptr = xmalloc(size + 1);
  78         ((char *) ptr)[size] = 0;
  79         return ptr;
  80 }
  81
  82 __hidden void *xmemdupz(const void *data, size_t len)
  83 {
  84         return memcpy(xmallocz(len), data, len);
  85 }
  86
  87 __hidden void *xrealloc(void *ptr, size_t nmemb, size_t size)
  88 {
  89         void *new_ptr;
  90         size_t new_size = nmemb * size;
  91         if (new_size == 0)
  92                 panic("xrealloc: zero size\n");
  93         if (SIZE_T_MAX / nmemb < size)
  94                 panic("xrealloc: nmemb * size > SIZE_T_MAX\n");
  95         if (ptr == NULL)
  96                 new_ptr = malloc(new_size);
  97         else
  98                 new_ptr = realloc(ptr, new_size);
  99         if (new_ptr == NULL)
 100                 panic("xrealloc: out of memory (size %zu bytes)\n", new_size);
 101         return new_ptr;
 102 }
 103
 104 __hidden void xfree(void *ptr)
 105 {
 106         if (ptr == NULL)
 107                 panic("xfree: NULL pointer given as argument\n");
 108         free(ptr);
 109 }
 110
 111 __hidden char *xstrdup(const char *str)
 112 {
 113         size_t len;
 114         char *cp;
 115         len = strlen(str) + 1;
 116         cp = xmalloc(len);
 117         strlcpy(cp, str, len);
 118         return cp;
 119 }
 120
 121 __hidden char *xstrndup(const char *str, size_t size)
 122 {
 123         size_t len;
 124         char *cp;
 125         len = strlen(str) + 1;
 126         if (size < len)
 127                 len = size;
 128         cp = xmalloc(len);
 129         strlcpy(cp, str, len);
 130         return cp;
 131 }
 132
 133 __hidden int xdup(int fd)
 134 {
 135         int ret = dup(fd);
 136         if (ret < 0)
 137                 panic("xdup: dup failed\n");
 138         return ret;
 139 }
 140