gdb/common/common-utils.c

   1 /* Shared general utility routines for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2014 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 #ifdef GDBSERVER
  21 #include "server.h"
  22 #else
  23 #include "defs.h"
  24 #endif
  25
  26 #include "gdb_assert.h"
  27 #include <string.h>
  28
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31
  32 /* The xmalloc() (libiberty.h) family of memory management routines.
  33
  34    These are like the ISO-C malloc() family except that they implement
  35    consistent semantics and guard against typical memory management
  36    problems.  */
  37
  38 /* NOTE: These are declared using PTR to ensure consistency with
  39    "libiberty.h".  xfree() is GDB local.  */
  40
  41 PTR                            /* ARI: PTR */
  42 xmalloc (size_t size)
  43 {
  44   void *val;
  45
  46   /* See libiberty/xmalloc.c.  This function need's to match that's
  47      semantics.  It never returns NULL.  */
  48   if (size == 0)
  49     size = 1;
  50
  51   val = malloc (size);         /* ARI: malloc */
  52   if (val == NULL)
  53     malloc_failure (size);
  54
  55   return val;
  56 }
  57
  58 PTR                              /* ARI: PTR */
  59 xrealloc (PTR ptr, size_t size)          /* ARI: PTR */
  60 {
  61   void *val;
  62
  63   /* See libiberty/xmalloc.c.  This function need's to match that's
  64      semantics.  It never returns NULL.  */
  65   if (size == 0)
  66     size = 1;
  67
  68   if (ptr != NULL)
  69     val = realloc (ptr, size);  /* ARI: realloc */
  70   else
  71     val = malloc (size);                /* ARI: malloc */
  72   if (val == NULL)
  73     malloc_failure (size);
  74
  75   return val;
  76 }
  77
  78 PTR                            /* ARI: PTR */
  79 xcalloc (size_t number, size_t size)
  80 {
  81   void *mem;
  82
  83   /* See libiberty/xmalloc.c.  This function need's to match that's
  84      semantics.  It never returns NULL.  */
  85   if (number == 0 || size == 0)
  86     {
  87       number = 1;
  88       size = 1;
  89     }
  90
  91   mem = calloc (number, size);      /* ARI: xcalloc */
  92   if (mem == NULL)
  93     malloc_failure (number * size);
  94
  95   return mem;
  96 }
  97
  98 void *
  99 xzalloc (size_t size)
 100 {
 101   return xcalloc (1, size);
 102 }
 103
 104 void
 105 xfree (void *ptr)
 106 {
 107   if (ptr != NULL)
 108     free (ptr);         /* ARI: free */
 109 }
 110
 111 /* Like asprintf/vasprintf but get an internal_error if the call
 112    fails. */
 113
 114 char *
 115 xstrprintf (const char *format, ...)
 116 {
 117   char *ret;
 118   va_list args;
 119
 120   va_start (args, format);
 121   ret = xstrvprintf (format, args);
 122   va_end (args);
 123   return ret;
 124 }
 125
 126 char *
 127 xstrvprintf (const char *format, va_list ap)
 128 {
 129   char *ret = NULL;
 130   int status = vasprintf (&ret, format, ap);
 131
 132   /* NULL is returned when there was a memory allocation problem, or
 133      any other error (for instance, a bad format string).  A negative
 134      status (the printed length) with a non-NULL buffer should never
 135      happen, but just to be sure.  */
 136   if (ret == NULL || status < 0)
 137     internal_error (__FILE__, __LINE__, _("vasprintf call failed"));
 138   return ret;
 139 }
 140
 141 int
 142 xsnprintf (char *str, size_t size, const char *format, ...)
 143 {
 144   va_list args;
 145   int ret;
 146
 147   va_start (args, format);
 148   ret = vsnprintf (str, size, format, args);
 149   gdb_assert (ret < size);
 150   va_end (args);
 151
 152   return ret;
 153 }
 154
 155 char *
 156 savestring (const char *ptr, size_t len)
 157 {
 158   char *p = (char *) xmalloc (len + 1);
 159
 160   memcpy (p, ptr, len);
 161   p[len] = 0;
 162   return p;
 163 }