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-rw-r--r--gfx/harfbuzz/src/hb-number.cc79
1 files changed, 79 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-number.cc b/gfx/harfbuzz/src/hb-number.cc
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index 0000000000..c52b284e1d
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+++ b/gfx/harfbuzz/src/hb-number.cc
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+/*
+ * Copyright © 2019 Ebrahim Byagowi
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ */
+
+#include "hb.hh"
+#include "hb-number.hh"
+#include "hb-number-parser.hh"
+
+template<typename T, typename Func>
+static bool
+_parse_number (const char **pp, const char *end, T *pv,
+ bool whole_buffer, Func f)
+{
+ char buf[32];
+ unsigned len = hb_min (ARRAY_LENGTH (buf) - 1, (unsigned) (end - *pp));
+ strncpy (buf, *pp, len);
+ buf[len] = '\0';
+
+ char *p = buf;
+ char *pend = p;
+
+ errno = 0;
+ *pv = f (p, &pend);
+ if (unlikely (errno || p == pend ||
+ /* Check if consumed whole buffer if is requested */
+ (whole_buffer && pend - p != end - *pp)))
+ return false;
+
+ *pp += pend - p;
+ return true;
+}
+
+bool
+hb_parse_int (const char **pp, const char *end, int *pv, bool whole_buffer)
+{
+ return _parse_number<int> (pp, end, pv, whole_buffer,
+ [] (const char *p, char **end)
+ { return strtol (p, end, 10); });
+}
+
+bool
+hb_parse_uint (const char **pp, const char *end, unsigned *pv,
+ bool whole_buffer, int base)
+{
+ return _parse_number<unsigned> (pp, end, pv, whole_buffer,
+ [base] (const char *p, char **end)
+ { return strtoul (p, end, base); });
+}
+
+bool
+hb_parse_double (const char **pp, const char *end, double *pv, bool whole_buffer)
+{
+ const char *pend = end;
+ *pv = strtod_rl (*pp, &pend);
+ if (unlikely (*pp == pend)) return false;
+ *pp = pend;
+ return !whole_buffer || end == pend;
+}