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-machinery.hh"
28#include "hb-number.hh"
29#include "hb-number-parser.hh"
30
31template<typename T, typename Func>
32static bool
33_parse_number (const char **pp, const char *end, T *pv,
34 bool whole_buffer, Func f)
35{
36 char buf[32];
37 unsigned len = hb_min (ARRAY_LENGTH (buf) - 1, (unsigned) (end - *pp));
38 strncpy (buf, *pp, len);
39 buf[len] = '\0';
40
41 char *p = buf;
42 char *pend = p;
43
44 errno = 0;
45 *pv = f (p, &pend);
46 if (unlikely (errno || p == pend ||
47 /* Check if consumed whole buffer if is requested */
48 (whole_buffer && pend - p != end - *pp)))
49 return false;
50
51 *pp += pend - p;
52 return true;
53}
54
55bool
56hb_parse_int (const char **pp, const char *end, int *pv, bool whole_buffer)
57{
58 return _parse_number<int> (pp, end, pv, whole_buffer,
59 [] (const char *p, char **end)
60 { return strtol (p, end, 10); });
61}
62
63bool
64hb_parse_uint (const char **pp, const char *end, unsigned *pv,
65 bool whole_buffer, int base)
66{
67 return _parse_number<unsigned> (pp, end, pv, whole_buffer,
68 [base] (const char *p, char **end)
69 { return strtoul (p, end, base); });
70}
71
72bool
73hb_parse_double (const char **pp, const char *end, double *pv, bool whole_buffer)
74{
75 const char *pend = end;
76 *pv = strtod_rl (*pp, &pend);
77 if (unlikely (*pp == pend)) return false;
78 *pp = pend;
79 return !whole_buffer || end == pend;
80}
81