gdb/common/common-utils.c

   1 /* Shared general utility routines for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2017 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 xfree (void *ptr)
  99 {
 100   if (ptr != NULL)
 101     free (ptr);         /* ARI: free */
 102 }
 103
 104 void
 105 xmalloc_failed (size_t size)
 106 {
 107   malloc_failure (size);
 108 }
 109
 110 /* Like asprintf/vasprintf but get an internal_error if the call
 111    fails. */
 112
 113 char *
 114 xstrprintf (const char *format, ...)
 115 {
 116   char *ret;
 117   va_list args;
 118
 119   va_start (args, format);
 120   ret = xstrvprintf (format, args);
 121   va_end (args);
 122   return ret;
 123 }
 124
 125 char *
 126 xstrvprintf (const char *format, va_list ap)
 127 {
 128   char *ret = NULL;
 129   int status = vasprintf (&ret, format, ap);
 130
 131   /* NULL is returned when there was a memory allocation problem, or
 132      any other error (for instance, a bad format string).  A negative
 133      status (the printed length) with a non-NULL buffer should never
 134      happen, but just to be sure.  */
 135   if (ret == NULL || status < 0)
 136     internal_error (__FILE__, __LINE__, _("vasprintf call failed"));
 137   return ret;
 138 }
 139
 140 int
 141 xsnprintf (char *str, size_t size, const char *format, ...)
 142 {
 143   va_list args;
 144   int ret;
 145
 146   va_start (args, format);
 147   ret = vsnprintf (str, size, format, args);
 148   gdb_assert (ret < size);
 149   va_end (args);
 150
 151   return ret;
 152 }
 153
 154 /* See documentation in common-utils.h.  */
 155
 156 std::string
 157 string_printf (const char* fmt, ...)
 158 {
 159   va_list vp;
 160   int size;
 161
 162   va_start (vp, fmt);
 163   size = vsnprintf (NULL, 0, fmt, vp);
 164   va_end (vp);
 165
 166   std::string str (size, '\0');
 167
 168   /* C++11 and later guarantee std::string uses contiguous memory and
 169      always includes the terminating '\0'.  */
 170   va_start (vp, fmt);
 171   vsprintf (&str[0], fmt, vp);
 172   va_end (vp);
 173
 174   return str;
 175 }
 176
 177 /* See documentation in common-utils.h.  */
 178
 179 std::string
 180 string_vprintf (const char* fmt, va_list args)
 181 {
 182   va_list vp;
 183   size_t size;
 184
 185   va_copy (vp, args);
 186   size = vsnprintf (NULL, 0, fmt, vp);
 187   va_end (vp);
 188
 189   std::string str (size, '\0');
 190
 191   /* C++11 and later guarantee std::string uses contiguous memory and
 192      always includes the terminating '\0'.  */
 193   vsprintf (&str[0], fmt, args);
 194
 195   return str;
 196 }
 197
 198
 199 /* See documentation in common-utils.h.  */
 200
 201 void
 202 string_appendf (std::string &str, const char *fmt, ...)
 203 {
 204   va_list vp;
 205
 206   va_start (vp, fmt);
 207   string_vappendf (str, fmt, vp);
 208   va_end (vp);
 209 }
 210
 211
 212 /* See documentation in common-utils.h.  */
 213
 214 void
 215 string_vappendf (std::string &str, const char *fmt, va_list args)
 216 {
 217   va_list vp;
 218   int grow_size;
 219
 220   va_copy (vp, args);
 221   grow_size = vsnprintf (NULL, 0, fmt, vp);
 222   va_end (vp);
 223
 224   size_t curr_size = str.size ();
 225   str.resize (curr_size + grow_size);
 226
 227   /* C++11 and later guarantee std::string uses contiguous memory and
 228      always includes the terminating '\0'.  */
 229   vsprintf (&str[curr_size], fmt, args);
 230 }
 231
 232 char *
 233 savestring (const char *ptr, size_t len)
 234 {
 235   char *p = (char *) xmalloc (len + 1);
 236
 237   memcpy (p, ptr, len);
 238   p[len] = 0;
 239   return p;
 240 }
 241
 242 /* The bit offset of the highest byte in a ULONGEST, for overflow
 243    checking.  */
 244
 245 #define HIGH_BYTE_POSN ((sizeof (ULONGEST) - 1) * HOST_CHAR_BIT)
 246
 247 /* True (non-zero) iff DIGIT is a valid digit in radix BASE,
 248    where 2 <= BASE <= 36.  */
 249
 250 static int
 251 is_digit_in_base (unsigned char digit, int base)
 252 {
 253   if (!isalnum (digit))
 254     return 0;
 255   if (base <= 10)
 256     return (isdigit (digit) && digit < base + '0');
 257   else
 258     return (isdigit (digit) || tolower (digit) < base - 10 + 'a');
 259 }
 260
 261 static int
 262 digit_to_int (unsigned char c)
 263 {
 264   if (isdigit (c))
 265     return c - '0';
 266   else
 267     return tolower (c) - 'a' + 10;
 268 }
 269
 270 /* As for strtoul, but for ULONGEST results.  */
 271
 272 ULONGEST
 273 strtoulst (const char *num, const char **trailer, int base)
 274 {
 275   unsigned int high_part;
 276   ULONGEST result;
 277   int minus = 0;
 278   int i = 0;
 279
 280   /* Skip leading whitespace.  */
 281   while (isspace (num[i]))
 282     i++;
 283
 284   /* Handle prefixes.  */
 285   if (num[i] == '+')
 286     i++;
 287   else if (num[i] == '-')
 288     {
 289       minus = 1;
 290       i++;
 291     }
 292
 293   if (base == 0 || base == 16)
 294     {
 295       if (num[i] == '0' && (num[i + 1] == 'x' || num[i + 1] == 'X'))
 296         {
 297           i += 2;
 298           if (base == 0)
 299             base = 16;
 300         }
 301     }
 302
 303   if (base == 0 && num[i] == '0')
 304     base = 8;
 305
 306   if (base == 0)
 307     base = 10;
 308
 309   if (base < 2 || base > 36)
 310     {
 311       errno = EINVAL;
 312       return 0;
 313     }
 314
 315   result = high_part = 0;
 316   for (; is_digit_in_base (num[i], base); i += 1)
 317     {
 318       result = result * base + digit_to_int (num[i]);
 319       high_part = high_part * base + (unsigned int) (result >> HIGH_BYTE_POSN);
 320       result &= ((ULONGEST) 1 << HIGH_BYTE_POSN) - 1;
 321       if (high_part > 0xff)
 322         {
 323           errno = ERANGE;
 324           result = ~ (ULONGEST) 0;
 325           high_part = 0;
 326           minus = 0;
 327           break;
 328         }
 329     }
 330
 331   if (trailer != NULL)
 332     *trailer = &num[i];
 333
 334   result = result + ((ULONGEST) high_part << HIGH_BYTE_POSN);
 335   if (minus)
 336     return -result;
 337   else
 338     return result;
 339 }
 340
 341 /* See documentation in common-utils.h.  */
 342
 343 char *
 344 skip_spaces (char *chp)
 345 {
 346   if (chp == NULL)
 347     return NULL;
 348   while (*chp && isspace (*chp))
 349     chp++;
 350   return chp;
 351 }
 352
 353 /* A const-correct version of the above.  */
 354
 355 const char *
 356 skip_spaces (const char *chp)
 357 {
 358   if (chp == NULL)
 359     return NULL;
 360   while (*chp && isspace (*chp))
 361     chp++;
 362   return chp;
 363 }
 364
 365 /* See documentation in common-utils.h.  */
 366
 367 const char *
 368 skip_to_space (const char *chp)
 369 {
 370   if (chp == NULL)
 371     return NULL;
 372   while (*chp && !isspace (*chp))
 373     chp++;
 374   return chp;
 375 }
 376
 377 /* See documentation in common-utils.h.  */
 378
 379 char *
 380 skip_to_space (char *chp)
 381 {
 382   return (char *) skip_to_space ((const char *) chp);
 383 }
 384
 385 /* See common/common-utils.h.  */
 386
 387 void
 388 free_vector_argv (std::vector<char *> &v)
 389 {
 390   for (char *el : v)
 391     xfree (el);
 392
 393   v.clear ();
 394 }
 395
 396 /* See common/common-utils.h.  */
 397
 398 std::string
 399 stringify_argv (const std::vector<char *> &args)
 400 {
 401   std::string ret;
 402
 403   if (!args.empty () && args[0] != NULL)
 404     {
 405       for (auto s : args)
 406         if (s != NULL)
 407           {
 408             ret += s;
 409             ret += ' ';
 410           }
 411
 412       /* Erase the last whitespace.  */
 413       ret.erase (ret.end () - 1);
 414     }
 415
 416   return ret;
 417 }