include/xalloc.h

   1 /*
   2  * Copyright (C) 2010 Davidlohr Bueso <dave@gnu.org>
   3  *
   4  * This file may be redistributed under the terms of the
   5  * GNU Lesser General Public License.
   6  *
   7  * General memory allocation wrappers for malloc, realloc, calloc and strdup
   8  */
   9
  10 #ifndef UTIL_LINUX_XALLOC_H
  11 #define UTIL_LINUX_XALLOC_H
  12
  13 #include <stdlib.h>
  14 #include <string.h>
  15
  16 #include "c.h"
  17
  18 #ifndef XALLOC_EXIT_CODE
  19 # define XALLOC_EXIT_CODE EXIT_FAILURE
  20 #endif
  21
  22 static inline void __err_oom(const char *file, unsigned int line)
  23 {
  24         err(XALLOC_EXIT_CODE, "%s: %u: cannot allocate memory", file, line);
  25 }
  26
  27 #define err_oom()       __err_oom(__FILE__, __LINE__)
  28
  29 static inline __ul_alloc_size(1)
  30 void *xmalloc(const size_t size)
  31 {
  32         void *ret = malloc(size);
  33
  34         if (!ret && size)
  35                 err(XALLOC_EXIT_CODE, "cannot allocate %zu bytes", size);
  36         return ret;
  37 }
  38
  39 static inline __ul_alloc_size(2)
  40 void *xrealloc(void *ptr, const size_t size)
  41 {
  42         void *ret = realloc(ptr, size);
  43
  44         if (!ret && size)
  45                 err(XALLOC_EXIT_CODE, "cannot allocate %zu bytes", size);
  46         return ret;
  47 }
  48
  49 static inline __ul_calloc_size(1, 2)
  50 void *xcalloc(const size_t nelems, const size_t size)
  51 {
  52         void *ret = calloc(nelems, size);
  53
  54         if (!ret && size && nelems)
  55                 err(XALLOC_EXIT_CODE, "cannot allocate %zu bytes", size);
  56         return ret;
  57 }
  58
  59 static inline char __attribute__((warn_unused_result)) *xstrdup(const char *str)
  60 {
  61         char *ret;
  62
  63         if (!str)
  64                 return NULL;
  65
  66         ret = strdup(str);
  67
  68         if (!ret)
  69                 err(XALLOC_EXIT_CODE, "cannot duplicate string");
  70         return ret;
  71 }
  72
  73 static inline char * __attribute__((warn_unused_result)) xstrndup(const char *str, size_t size)
  74 {
  75         char *ret;
  76
  77         if (!str)
  78                 return NULL;
  79
  80         ret = strndup(str, size);
  81
  82         if (!ret)
  83                 err(XALLOC_EXIT_CODE, "cannot duplicate string");
  84         return ret;
  85 }
  86
  87
  88 static inline int __attribute__ ((__format__(printf, 2, 3)))
  89     xasprintf(char **strp, const char *fmt, ...)
  90 {
  91         int ret;
  92         va_list args;
  93         va_start(args, fmt);
  94         ret = vasprintf(&(*strp), fmt, args);
  95         va_end(args);
  96         if (ret < 0)
  97                 err(XALLOC_EXIT_CODE, "cannot allocate string");
  98         return ret;
  99 }
 100
 101 static inline int  __attribute__ ((__format__(printf, 2, 0)))
 102 xvasprintf(char **strp, const char *fmt, va_list ap)
 103 {
 104         int ret = vasprintf(&(*strp), fmt, ap);
 105         if (ret < 0)
 106                 err(XALLOC_EXIT_CODE, "cannot allocate string");
 107         return ret;
 108 }
 109
 110
 111 static inline char * __attribute__((warn_unused_result)) xgethostname(void)
 112 {
 113         char *name;
 114         size_t sz = get_hostname_max() + 1;
 115
 116         name = xmalloc(sizeof(char) * sz);
 117
 118         if (gethostname(name, sz) != 0) {
 119                 free(name);
 120                 return NULL;
 121         }
 122         name[sz - 1] = '\0';
 123         return name;
 124 }
 125
 126 #endif