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Ebrahim Byagowi43372fb2019-09-03 01:02:40 +04301/*
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"
Ebrahim Byagowi5c8f9602019-12-09 10:48:43 +033027#include "hb-number.hh"
Ebrahim Byagowi9b1d5c42019-12-09 12:29:28 +033028#include "hb-number-parser.hh"
Ebrahim Byagowi43372fb2019-09-03 01:02:40 +043029
Ebrahim Byagowie2cecf12019-09-03 15:14:21 +043030template<typename T, typename Func>
Ebrahim Byagowib5e68052019-09-03 15:23:40 +043031static bool
Ebrahim Byagowi65690b52019-09-03 23:09:47 +043032_parse_number (const char **pp, const char *end, T *pv,
33 bool whole_buffer, Func f)
Ebrahim Byagowi43372fb2019-09-03 01:02:40 +043034{
35 char buf[32];
Ebrahim Byagowidca8ba62020-05-10 16:57:45 +043036 unsigned len = hb_min (ARRAY_LENGTH (buf) - 1, (unsigned) (end - *pp));
Ebrahim Byagowi43372fb2019-09-03 01:02:40 +043037 strncpy (buf, *pp, len);
38 buf[len] = '\0';
39
40 char *p = buf;
41 char *pend = p;
Ebrahim Byagowi43372fb2019-09-03 01:02:40 +043042
43 errno = 0;
Ebrahim Byagowib5e68052019-09-03 15:23:40 +043044 *pv = f (p, &pend);
Ebrahim Byagowi65690b52019-09-03 23:09:47 +043045 if (unlikely (errno || p == pend ||
46 /* Check if consumed whole buffer if is requested */
Ebrahim Byagowidca8ba62020-05-10 16:57:45 +043047 (whole_buffer && pend - p != end - *pp)))
48 return false;
Ebrahim Byagowi43372fb2019-09-03 01:02:40 +043049
Ebrahim Byagowi43372fb2019-09-03 01:02:40 +043050 *pp += pend - p;
51 return true;
52}
53
Ebrahim Byagowia77bb7e2019-09-03 14:49:14 +043054bool
Ebrahim Byagowi65690b52019-09-03 23:09:47 +043055hb_parse_int (const char **pp, const char *end, int *pv, bool whole_buffer)
Ebrahim Byagowie2cecf12019-09-03 15:14:21 +043056{
Ebrahim Byagowi65690b52019-09-03 23:09:47 +043057 return _parse_number<int> (pp, end, pv, whole_buffer,
58 [] (const char *p, char **end)
59 { return strtol (p, end, 10); });
Ebrahim Byagowie2cecf12019-09-03 15:14:21 +043060}
61
62bool
Ebrahim Byagowidca8ba62020-05-10 16:57:45 +043063hb_parse_uint (const char **pp, const char *end, unsigned *pv,
Ebrahim Byagowi65690b52019-09-03 23:09:47 +043064 bool whole_buffer, int base)
Ebrahim Byagowia77bb7e2019-09-03 14:49:14 +043065{
Ebrahim Byagowidca8ba62020-05-10 16:57:45 +043066 return _parse_number<unsigned> (pp, end, pv, whole_buffer,
67 [base] (const char *p, char **end)
68 { return strtoul (p, end, base); });
Ebrahim Byagowia77bb7e2019-09-03 14:49:14 +043069}
70
Ebrahim Byagowi43372fb2019-09-03 01:02:40 +043071bool
Ebrahim Byagowidca8ba62020-05-10 16:57:45 +043072hb_parse_double (const char **pp, const char *end, double *pv, bool whole_buffer)
Ebrahim Byagowi43372fb2019-09-03 01:02:40 +043073{
Ebrahim Byagowidca8ba62020-05-10 16:57:45 +043074 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;
Ebrahim Byagowi43372fb2019-09-03 01:02:40 +043079}