gdb/common/common-utils.c

   1 /* Shared general utility routines for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2015 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "common-defs.h"
  21
  22 /* The xmalloc() (libiberty.h) family of memory management routines.
  23
  24    These are like the ISO-C malloc() family except that they implement
  25    consistent semantics and guard against typical memory management
  26    problems.  */
  27
  28 /* NOTE: These are declared using PTR to ensure consistency with
  29    "libiberty.h".  xfree() is GDB local.  */
  30
  31 PTR                            /* ARI: PTR */
  32 xmalloc (size_t size)
  33 {
  34   void *val;
  35
  36   /* See libiberty/xmalloc.c.  This function need's to match that's
  37      semantics.  It never returns NULL.  */
  38   if (size == 0)
  39     size = 1;
  40
  41   val = malloc (size);         /* ARI: malloc */
  42   if (val == NULL)
  43     malloc_failure (size);
  44
  45   return val;
  46 }
  47
  48 PTR                              /* ARI: PTR */
  49 xrealloc (PTR ptr, size_t size)          /* ARI: PTR */
  50 {
  51   void *val;
  52
  53   /* See libiberty/xmalloc.c.  This function need's to match that's
  54      semantics.  It never returns NULL.  */
  55   if (size == 0)
  56     size = 1;
  57
  58   if (ptr != NULL)
  59     val = realloc (ptr, size);  /* ARI: realloc */
  60   else
  61     val = malloc (size);                /* ARI: malloc */
  62   if (val == NULL)
  63     malloc_failure (size);
  64
  65   return val;
  66 }
  67
  68 PTR                            /* ARI: PTR */
  69 xcalloc (size_t number, size_t size)
  70 {
  71   void *mem;
  72
  73   /* See libiberty/xmalloc.c.  This function need's to match that's
  74      semantics.  It never returns NULL.  */
  75   if (number == 0 || size == 0)
  76     {
  77       number = 1;
  78       size = 1;
  79     }
  80
  81   mem = calloc (number, size);      /* ARI: xcalloc */
  82   if (mem == NULL)
  83     malloc_failure (number * size);
  84
  85   return mem;
  86 }
  87
  88 void *
  89 xzalloc (size_t size)
  90 {
  91   return xcalloc (1, size);
  92 }
  93
  94 void
  95 xfree (void *ptr)
  96 {
  97   if (ptr != NULL)
  98     free (ptr);         /* ARI: free */
  99 }
 100
 101 /* Like asprintf/vasprintf but get an internal_error if the call
 102    fails. */
 103
 104 char *
 105 xstrprintf (const char *format, ...)
 106 {
 107   char *ret;
 108   va_list args;
 109
 110   va_start (args, format);
 111   ret = xstrvprintf (format, args);
 112   va_end (args);
 113   return ret;
 114 }
 115
 116 char *
 117 xstrvprintf (const char *format, va_list ap)
 118 {
 119   char *ret = NULL;
 120   int status = vasprintf (&ret, format, ap);
 121
 122   /* NULL is returned when there was a memory allocation problem, or
 123      any other error (for instance, a bad format string).  A negative
 124      status (the printed length) with a non-NULL buffer should never
 125      happen, but just to be sure.  */
 126   if (ret == NULL || status < 0)
 127     internal_error (__FILE__, __LINE__, _("vasprintf call failed"));
 128   return ret;
 129 }
 130
 131 int
 132 xsnprintf (char *str, size_t size, const char *format, ...)
 133 {
 134   va_list args;
 135   int ret;
 136
 137   va_start (args, format);
 138   ret = vsnprintf (str, size, format, args);
 139   gdb_assert (ret < size);
 140   va_end (args);
 141
 142   return ret;
 143 }
 144
 145 char *
 146 savestring (const char *ptr, size_t len)
 147 {
 148   char *p = (char *) xmalloc (len + 1);
 149
 150   memcpy (p, ptr, len);
 151   p[len] = 0;
 152   return p;
 153 }