tor-browser

The Tor Browser
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hb-number.cc (2414B)

      1 /*
      2 * Copyright © 2019  Ebrahim Byagowi
      3 *
      4 *  This is part of HarfBuzz, a text shaping library.
      5 *
      6 * Permission is hereby granted, without written agreement and without
      7 * license or royalty fees, to use, copy, modify, and distribute this
      8 * software and its documentation for any purpose, provided that the
      9 * above copyright notice and the following two paragraphs appear in
     10 * all copies of this software.
     11 *
     12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
     13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
     14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
     15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
     16 * DAMAGE.
     17 *
     18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
     19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
     20 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
     21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
     22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
     23 *
     24 */
     25 
     26 #include "hb.hh"
     27 #include "hb-number.hh"
     28 #include "hb-number-parser.hh"
     29 
     30 template<typename T, typename Func>
     31 static bool
     32 _parse_number (const char **pp, const char *end, T *pv,
     33        bool whole_buffer, Func f)
     34 {
     35  char buf[32];
     36  unsigned len = hb_min (ARRAY_LENGTH (buf) - 1, (unsigned) (end - *pp));
     37  strncpy (buf, *pp, len);
     38  buf[len] = '\0';
     39 
     40  char *p = buf;
     41  char *pend = p;
     42 
     43  errno = 0;
     44  *pv = f (p, &pend);
     45  if (unlikely (errno || p == pend ||
     46 	/* Check if consumed whole buffer if is requested */
     47 	(whole_buffer && pend - p != end - *pp)))
     48    return false;
     49 
     50  *pp += pend - p;
     51  return true;
     52 }
     53 
     54 bool
     55 hb_parse_int (const char **pp, const char *end, int *pv, bool whole_buffer)
     56 {
     57  return _parse_number<int> (pp, end, pv, whole_buffer,
     58 		     [] (const char *p, char **end)
     59 		     { return strtol (p, end, 10); });
     60 }
     61 
     62 bool
     63 hb_parse_uint (const char **pp, const char *end, unsigned *pv,
     64        bool whole_buffer, int base)
     65 {
     66  return _parse_number<unsigned> (pp, end, pv, whole_buffer,
     67 			  [base] (const char *p, char **end)
     68 			  { return strtoul (p, end, base); });
     69 }
     70 
     71 bool
     72 hb_parse_double (const char **pp, const char *end, double *pv, bool whole_buffer)
     73 {
     74  const char *pend = end;
     75  *pv = strtod_rl (*pp, &pend);
     76  if (unlikely (*pp == pend)) return false;
     77  *pp = pend;
     78  return !whole_buffer || end == pend;
     79 }