gdb/common/common-utils.c

   1 /* Shared general utility routines for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2018 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 "common-utils.h"
  22 #include "host-defs.h"
  23 #include <ctype.h>
  24
  25 /* The xmalloc() (libiberty.h) family of memory management routines.
  26
  27    These are like the ISO-C malloc() family except that they implement
  28    consistent semantics and guard against typical memory management
  29    problems.  */
  30
  31 /* NOTE: These are declared using PTR to ensure consistency with
  32    "libiberty.h".  xfree() is GDB local.  */
  33
  34 PTR                            /* ARI: PTR */
  35 xmalloc (size_t size)
  36 {
  37   void *val;
  38
  39   /* See libiberty/xmalloc.c.  This function need's to match that's
  40      semantics.  It never returns NULL.  */
  41   if (size == 0)
  42     size = 1;
  43
  44   val = malloc (size);         /* ARI: malloc */
  45   if (val == NULL)
  46     malloc_failure (size);
  47
  48   return val;
  49 }
  50
  51 PTR                              /* ARI: PTR */
  52 xrealloc (PTR ptr, size_t size)          /* ARI: PTR */
  53 {
  54   void *val;
  55
  56   /* See libiberty/xmalloc.c.  This function need's to match that's
  57      semantics.  It never returns NULL.  */
  58   if (size == 0)
  59     size = 1;
  60
  61   if (ptr != NULL)
  62     val = realloc (ptr, size);  /* ARI: realloc */
  63   else
  64     val = malloc (size);                /* ARI: malloc */
  65   if (val == NULL)
  66     malloc_failure (size);
  67
  68   return val;
  69 }
  70
  71 PTR                            /* ARI: PTR */
  72 xcalloc (size_t number, size_t size)
  73 {
  74   void *mem;
  75
  76   /* See libiberty/xmalloc.c.  This function need's to match that's
  77      semantics.  It never returns NULL.  */
  78   if (number == 0 || size == 0)
  79     {
  80       number = 1;
  81       size = 1;
  82     }
  83
  84   mem = calloc (number, size);      /* ARI: xcalloc */
  85   if (mem == NULL)
  86     malloc_failure (number * size);
  87
  88   return mem;
  89 }
  90
  91 void *
  92 xzalloc (size_t size)
  93 {
  94   return xcalloc (1, size);
  95 }
  96
  97 void
  98 xmalloc_failed (size_t size)
  99 {
 100   malloc_failure (size);
 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 /* See documentation in common-utils.h.  */
 148
 149 std::string
 150 string_printf (const char* fmt, ...)
 151 {
 152   va_list vp;
 153   int size;
 154
 155   va_start (vp, fmt);
 156   size = vsnprintf (NULL, 0, fmt, vp);
 157   va_end (vp);
 158
 159   std::string str (size, '\0');
 160
 161   /* C++11 and later guarantee std::string uses contiguous memory and
 162      always includes the terminating '\0'.  */
 163   va_start (vp, fmt);
 164   vsprintf (&str[0], fmt, vp);
 165   va_end (vp);
 166
 167   return str;
 168 }
 169
 170 /* See documentation in common-utils.h.  */
 171
 172 std::string
 173 string_vprintf (const char* fmt, va_list args)
 174 {
 175   va_list vp;
 176   size_t size;
 177
 178   va_copy (vp, args);
 179   size = vsnprintf (NULL, 0, fmt, vp);
 180   va_end (vp);
 181
 182   std::string str (size, '\0');
 183
 184   /* C++11 and later guarantee std::string uses contiguous memory and
 185      always includes the terminating '\0'.  */
 186   vsprintf (&str[0], fmt, args);
 187
 188   return str;
 189 }
 190
 191
 192 /* See documentation in common-utils.h.  */
 193
 194 void
 195 string_appendf (std::string &str, const char *fmt, ...)
 196 {
 197   va_list vp;
 198
 199   va_start (vp, fmt);
 200   string_vappendf (str, fmt, vp);
 201   va_end (vp);
 202 }
 203
 204
 205 /* See documentation in common-utils.h.  */
 206
 207 void
 208 string_vappendf (std::string &str, const char *fmt, va_list args)
 209 {
 210   va_list vp;
 211   int grow_size;
 212
 213   va_copy (vp, args);
 214   grow_size = vsnprintf (NULL, 0, fmt, vp);
 215   va_end (vp);
 216
 217   size_t curr_size = str.size ();
 218   str.resize (curr_size + grow_size);
 219
 220   /* C++11 and later guarantee std::string uses contiguous memory and
 221      always includes the terminating '\0'.  */
 222   vsprintf (&str[curr_size], fmt, args);
 223 }
 224
 225 char *
 226 savestring (const char *ptr, size_t len)
 227 {
 228   char *p = (char *) xmalloc (len + 1);
 229
 230   memcpy (p, ptr, len);
 231   p[len] = 0;
 232   return p;
 233 }
 234
 235 /* The bit offset of the highest byte in a ULONGEST, for overflow
 236    checking.  */
 237
 238 #define HIGH_BYTE_POSN ((sizeof (ULONGEST) - 1) * HOST_CHAR_BIT)
 239
 240 /* True (non-zero) iff DIGIT is a valid digit in radix BASE,
 241    where 2 <= BASE <= 36.  */
 242
 243 static int
 244 is_digit_in_base (unsigned char digit, int base)
 245 {
 246   if (!isalnum (digit))
 247     return 0;
 248   if (base <= 10)
 249     return (isdigit (digit) && digit < base + '0');
 250   else
 251     return (isdigit (digit) || tolower (digit) < base - 10 + 'a');
 252 }
 253
 254 static int
 255 digit_to_int (unsigned char c)
 256 {
 257   if (isdigit (c))
 258     return c - '0';
 259   else
 260     return tolower (c) - 'a' + 10;
 261 }
 262
 263 /* As for strtoul, but for ULONGEST results.  */
 264
 265 ULONGEST
 266 strtoulst (const char *num, const char **trailer, int base)
 267 {
 268   unsigned int high_part;
 269   ULONGEST result;
 270   int minus = 0;
 271   int i = 0;
 272
 273   /* Skip leading whitespace.  */
 274   while (isspace (num[i]))
 275     i++;
 276
 277   /* Handle prefixes.  */
 278   if (num[i] == '+')
 279     i++;
 280   else if (num[i] == '-')
 281     {
 282       minus = 1;
 283       i++;
 284     }
 285
 286   if (base == 0 || base == 16)
 287     {
 288       if (num[i] == '0' && (num[i + 1] == 'x' || num[i + 1] == 'X'))
 289         {
 290           i += 2;
 291           if (base == 0)
 292             base = 16;
 293         }
 294     }
 295
 296   if (base == 0 && num[i] == '0')
 297     base = 8;
 298
 299   if (base == 0)
 300     base = 10;
 301
 302   if (base < 2 || base > 36)
 303     {
 304       errno = EINVAL;
 305       return 0;
 306     }
 307
 308   result = high_part = 0;
 309   for (; is_digit_in_base (num[i], base); i += 1)
 310     {
 311       result = result * base + digit_to_int (num[i]);
 312       high_part = high_part * base + (unsigned int) (result >> HIGH_BYTE_POSN);
 313       result &= ((ULONGEST) 1 << HIGH_BYTE_POSN) - 1;
 314       if (high_part > 0xff)
 315         {
 316           errno = ERANGE;
 317           result = ~ (ULONGEST) 0;
 318           high_part = 0;
 319           minus = 0;
 320           break;
 321         }
 322     }
 323
 324   if (trailer != NULL)
 325     *trailer = &num[i];
 326
 327   result = result + ((ULONGEST) high_part << HIGH_BYTE_POSN);
 328   if (minus)
 329     return -result;
 330   else
 331     return result;
 332 }
 333
 334 /* See documentation in common-utils.h.  */
 335
 336 char *
 337 skip_spaces (char *chp)
 338 {
 339   if (chp == NULL)
 340     return NULL;
 341   while (*chp && isspace (*chp))
 342     chp++;
 343   return chp;
 344 }
 345
 346 /* A const-correct version of the above.  */
 347
 348 const char *
 349 skip_spaces (const char *chp)
 350 {
 351   if (chp == NULL)
 352     return NULL;
 353   while (*chp && isspace (*chp))
 354     chp++;
 355   return chp;
 356 }
 357
 358 /* See documentation in common-utils.h.  */
 359
 360 const char *
 361 skip_to_space (const char *chp)
 362 {
 363   if (chp == NULL)
 364     return NULL;
 365   while (*chp && !isspace (*chp))
 366     chp++;
 367   return chp;
 368 }
 369
 370 /* See documentation in common-utils.h.  */
 371
 372 char *
 373 skip_to_space (char *chp)
 374 {
 375   return (char *) skip_to_space ((const char *) chp);
 376 }
 377
 378 /* See common/common-utils.h.  */
 379
 380 void
 381 free_vector_argv (std::vector<char *> &v)
 382 {
 383   for (char *el : v)
 384     xfree (el);
 385
 386   v.clear ();
 387 }
 388
 389 /* See common/common-utils.h.  */
 390
 391 std::string
 392 stringify_argv (const std::vector<char *> &args)
 393 {
 394   std::string ret;
 395
 396   if (!args.empty () && args[0] != NULL)
 397     {
 398       for (auto s : args)
 399         if (s != NULL)
 400           {
 401             ret += s;
 402             ret += ' ';
 403           }
 404
 405       /* Erase the last whitespace.  */
 406       ret.erase (ret.end () - 1);
 407     }
 408
 409   return ret;
 410 }