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 #include "host-defs.h"
  22 #include <ctype.h>
  23
  24 /* The xmalloc() (libiberty.h) family of memory management routines.
  25
  26    These are like the ISO-C malloc() family except that they implement
  27    consistent semantics and guard against typical memory management
  28    problems.  */
  29
  30 /* NOTE: These are declared using PTR to ensure consistency with
  31    "libiberty.h".  xfree() is GDB local.  */
  32
  33 PTR                            /* ARI: PTR */
  34 xmalloc (size_t size)
  35 {
  36   void *val;
  37
  38   /* See libiberty/xmalloc.c.  This function need's to match that's
  39      semantics.  It never returns NULL.  */
  40   if (size == 0)
  41     size = 1;
  42
  43   val = malloc (size);         /* ARI: malloc */
  44   if (val == NULL)
  45     malloc_failure (size);
  46
  47   return val;
  48 }
  49
  50 PTR                              /* ARI: PTR */
  51 xrealloc (PTR ptr, size_t size)          /* ARI: PTR */
  52 {
  53   void *val;
  54
  55   /* See libiberty/xmalloc.c.  This function need's to match that's
  56      semantics.  It never returns NULL.  */
  57   if (size == 0)
  58     size = 1;
  59
  60   if (ptr != NULL)
  61     val = realloc (ptr, size);  /* ARI: realloc */
  62   else
  63     val = malloc (size);                /* ARI: malloc */
  64   if (val == NULL)
  65     malloc_failure (size);
  66
  67   return val;
  68 }
  69
  70 PTR                            /* ARI: PTR */
  71 xcalloc (size_t number, size_t size)
  72 {
  73   void *mem;
  74
  75   /* See libiberty/xmalloc.c.  This function need's to match that's
  76      semantics.  It never returns NULL.  */
  77   if (number == 0 || size == 0)
  78     {
  79       number = 1;
  80       size = 1;
  81     }
  82
  83   mem = calloc (number, size);      /* ARI: xcalloc */
  84   if (mem == NULL)
  85     malloc_failure (number * size);
  86
  87   return mem;
  88 }
  89
  90 void *
  91 xzalloc (size_t size)
  92 {
  93   return xcalloc (1, size);
  94 }
  95
  96 void
  97 xfree (void *ptr)
  98 {
  99   if (ptr != NULL)
 100     free (ptr);         /* ARI: free */
 101 }
 102
 103 /* Like asprintf/vasprintf but get an internal_error if the call
 104    fails. */
 105
 106 char *
 107 xstrprintf (const char *format, ...)
 108 {
 109   char *ret;
 110   va_list args;
 111
 112   va_start (args, format);
 113   ret = xstrvprintf (format, args);
 114   va_end (args);
 115   return ret;
 116 }
 117
 118 char *
 119 xstrvprintf (const char *format, va_list ap)
 120 {
 121   char *ret = NULL;
 122   int status = vasprintf (&ret, format, ap);
 123
 124   /* NULL is returned when there was a memory allocation problem, or
 125      any other error (for instance, a bad format string).  A negative
 126      status (the printed length) with a non-NULL buffer should never
 127      happen, but just to be sure.  */
 128   if (ret == NULL || status < 0)
 129     internal_error (__FILE__, __LINE__, _("vasprintf call failed"));
 130   return ret;
 131 }
 132
 133 int
 134 xsnprintf (char *str, size_t size, const char *format, ...)
 135 {
 136   va_list args;
 137   int ret;
 138
 139   va_start (args, format);
 140   ret = vsnprintf (str, size, format, args);
 141   gdb_assert (ret < size);
 142   va_end (args);
 143
 144   return ret;
 145 }
 146
 147 char *
 148 savestring (const char *ptr, size_t len)
 149 {
 150   char *p = (char *) xmalloc (len + 1);
 151
 152   memcpy (p, ptr, len);
 153   p[len] = 0;
 154   return p;
 155 }
 156
 157 /* The bit offset of the highest byte in a ULONGEST, for overflow
 158    checking.  */
 159
 160 #define HIGH_BYTE_POSN ((sizeof (ULONGEST) - 1) * HOST_CHAR_BIT)
 161
 162 /* True (non-zero) iff DIGIT is a valid digit in radix BASE,
 163    where 2 <= BASE <= 36.  */
 164
 165 static int
 166 is_digit_in_base (unsigned char digit, int base)
 167 {
 168   if (!isalnum (digit))
 169     return 0;
 170   if (base <= 10)
 171     return (isdigit (digit) && digit < base + '0');
 172   else
 173     return (isdigit (digit) || tolower (digit) < base - 10 + 'a');
 174 }
 175
 176 static int
 177 digit_to_int (unsigned char c)
 178 {
 179   if (isdigit (c))
 180     return c - '0';
 181   else
 182     return tolower (c) - 'a' + 10;
 183 }
 184
 185 /* As for strtoul, but for ULONGEST results.  */
 186
 187 ULONGEST
 188 strtoulst (const char *num, const char **trailer, int base)
 189 {
 190   unsigned int high_part;
 191   ULONGEST result;
 192   int minus = 0;
 193   int i = 0;
 194
 195   /* Skip leading whitespace.  */
 196   while (isspace (num[i]))
 197     i++;
 198
 199   /* Handle prefixes.  */
 200   if (num[i] == '+')
 201     i++;
 202   else if (num[i] == '-')
 203     {
 204       minus = 1;
 205       i++;
 206     }
 207
 208   if (base == 0 || base == 16)
 209     {
 210       if (num[i] == '0' && (num[i + 1] == 'x' || num[i + 1] == 'X'))
 211         {
 212           i += 2;
 213           if (base == 0)
 214             base = 16;
 215         }
 216     }
 217
 218   if (base == 0 && num[i] == '0')
 219     base = 8;
 220
 221   if (base == 0)
 222     base = 10;
 223
 224   if (base < 2 || base > 36)
 225     {
 226       errno = EINVAL;
 227       return 0;
 228     }
 229
 230   result = high_part = 0;
 231   for (; is_digit_in_base (num[i], base); i += 1)
 232     {
 233       result = result * base + digit_to_int (num[i]);
 234       high_part = high_part * base + (unsigned int) (result >> HIGH_BYTE_POSN);
 235       result &= ((ULONGEST) 1 << HIGH_BYTE_POSN) - 1;
 236       if (high_part > 0xff)
 237         {
 238           errno = ERANGE;
 239           result = ~ (ULONGEST) 0;
 240           high_part = 0;
 241           minus = 0;
 242           break;
 243         }
 244     }
 245
 246   if (trailer != NULL)
 247     *trailer = &num[i];
 248
 249   result = result + ((ULONGEST) high_part << HIGH_BYTE_POSN);
 250   if (minus)
 251     return -result;
 252   else
 253     return result;
 254 }
 255
 256 /* See documentation in cli-utils.h.  */
 257
 258 char *
 259 skip_spaces (char *chp)
 260 {
 261   if (chp == NULL)
 262     return NULL;
 263   while (*chp && isspace (*chp))
 264     chp++;
 265   return chp;
 266 }
 267
 268 /* A const-correct version of the above.  */
 269
 270 const char *
 271 skip_spaces_const (const char *chp)
 272 {
 273   if (chp == NULL)
 274     return NULL;
 275   while (*chp && isspace (*chp))
 276     chp++;
 277   return chp;
 278 }
 279
 280 /* See documentation in cli-utils.h.  */
 281
 282 const char *
 283 skip_to_space_const (const char *chp)
 284 {
 285   if (chp == NULL)
 286     return NULL;
 287   while (*chp && !isspace (*chp))
 288     chp++;
 289   return chp;
 290 }