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[ot-tags] Optimize lang_matches() 

Part of https://github.com/harfbuzz/harfbuzz/issues/3591

Before:
------------------------------------------------------------------------------------------------
Benchmark                                                      Time             CPU   Iterations
------------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY       8.67 ns         8.64 ns     80324382
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN         91.2 ns         90.9 ns      7674131
BM_hb_ot_tags_from_script_and_language/COMMON en_US         41.1 ns         41.0 ns     17174093
BM_hb_ot_tags_from_script_and_language/LATIN en_US          41.3 ns         41.2 ns     17000876
BM_hb_ot_tags_from_script_and_language/COMMON none          4.56 ns         4.55 ns    153914130
BM_hb_ot_tags_from_script_and_language/LATIN none           4.53 ns         4.52 ns    153830303

After:
------------------------------------------------------------------------------------------------
Benchmark                                                      Time             CPU   Iterations
------------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY       8.24 ns         8.21 ns     84078465
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN         77.5 ns         77.2 ns      9059230
BM_hb_ot_tags_from_script_and_language/COMMON en_US         38.8 ns         38.7 ns     17790692
BM_hb_ot_tags_from_script_and_language/LATIN en_US          37.6 ns         37.5 ns     18648293
BM_hb_ot_tags_from_script_and_language/COMMON none          4.50 ns         4.49 ns    155573267
BM_hb_ot_tags_from_script_and_language/LATIN none           4.49 ns         4.47 ns    156456653
This commit is contained in:
Behdad Esfahbod 2022-05-17 14:57:08 -06:00
parent 407a135baf
commit 15be0deda0
3 changed files with 70 additions and 69 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/gen-tag-table.py
View File

@ -1087,7 +1087,7 @@ for initial, items in sorted (complex_tags.items ()):
if string_literal[-1] == '-':
print ('0 == strncmp (&lang_str[1], "%s", %i)' % (string_literal, len (string_literal)), end='')
else:
print ('lang_matches (&lang_str[1], "%s")' % string_literal, end='')
print ('lang_matches (&lang_str[1], limit, "%s", %i)' % (string_literal, len (string_literal)), end='')
print_subtag_matches (script, True)
print_subtag_matches (region, True)
print_subtag_matches (lt.variant, True)

126
src/hb-ot-tag-table.hh
View File

@ -1721,14 +1721,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
}
break;
case 'c':
if (lang_matches (&lang_str[1], "do-hant-hk"))
if (lang_matches (&lang_str[1], limit, "do-hant-hk", 10))
{
/* Min Dong Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "do-hant-mo"))
if (lang_matches (&lang_str[1], limit, "do-hant-mo", 10))
{
/* Min Dong Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -1741,14 +1741,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "jy-hant-hk"))
if (lang_matches (&lang_str[1], limit, "jy-hant-hk", 10))
{
/* Jinyu Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "jy-hant-mo"))
if (lang_matches (&lang_str[1], limit, "jy-hant-mo", 10))
{
/* Jinyu Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -1761,14 +1761,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "mn-hant-hk"))
if (lang_matches (&lang_str[1], limit, "mn-hant-hk", 10))
{
/* Mandarin Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "mn-hant-mo"))
if (lang_matches (&lang_str[1], limit, "mn-hant-mo", 10))
{
/* Mandarin Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -1781,14 +1781,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "np-hant-hk"))
if (lang_matches (&lang_str[1], limit, "np-hant-hk", 10))
{
/* Northern Ping Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "np-hant-mo"))
if (lang_matches (&lang_str[1], limit, "np-hant-mo", 10))
{
/* Northern Ping Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -1801,14 +1801,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "px-hant-hk"))
if (lang_matches (&lang_str[1], limit, "px-hant-hk", 10))
{
/* Pu-Xian Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "px-hant-mo"))
if (lang_matches (&lang_str[1], limit, "px-hant-mo", 10))
{
/* Pu-Xian Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -1821,14 +1821,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "sp-hant-hk"))
if (lang_matches (&lang_str[1], limit, "sp-hant-hk", 10))
{
/* Southern Ping Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "sp-hant-mo"))
if (lang_matches (&lang_str[1], limit, "sp-hant-mo", 10))
{
/* Southern Ping Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -1841,14 +1841,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "zh-hant-hk"))
if (lang_matches (&lang_str[1], limit, "zh-hant-hk", 10))
{
/* Huizhou Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "zh-hant-mo"))
if (lang_matches (&lang_str[1], limit, "zh-hant-mo", 10))
{
/* Huizhou Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -1861,14 +1861,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "zo-hant-hk"))
if (lang_matches (&lang_str[1], limit, "zo-hant-hk", 10))
{
/* Min Zhong Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "zo-hant-mo"))
if (lang_matches (&lang_str[1], limit, "zo-hant-mo", 10))
{
/* Min Zhong Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -1881,112 +1881,112 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "do-hans"))
if (lang_matches (&lang_str[1], limit, "do-hans", 7))
{
/* Min Dong Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "do-hant"))
if (lang_matches (&lang_str[1], limit, "do-hant", 7))
{
/* Min Dong Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "jy-hans"))
if (lang_matches (&lang_str[1], limit, "jy-hans", 7))
{
/* Jinyu Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "jy-hant"))
if (lang_matches (&lang_str[1], limit, "jy-hant", 7))
{
/* Jinyu Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "mn-hans"))
if (lang_matches (&lang_str[1], limit, "mn-hans", 7))
{
/* Mandarin Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "mn-hant"))
if (lang_matches (&lang_str[1], limit, "mn-hant", 7))
{
/* Mandarin Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "np-hans"))
if (lang_matches (&lang_str[1], limit, "np-hans", 7))
{
/* Northern Ping Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "np-hant"))
if (lang_matches (&lang_str[1], limit, "np-hant", 7))
{
/* Northern Ping Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "px-hans"))
if (lang_matches (&lang_str[1], limit, "px-hans", 7))
{
/* Pu-Xian Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "px-hant"))
if (lang_matches (&lang_str[1], limit, "px-hant", 7))
{
/* Pu-Xian Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "sp-hans"))
if (lang_matches (&lang_str[1], limit, "sp-hans", 7))
{
/* Southern Ping Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "sp-hant"))
if (lang_matches (&lang_str[1], limit, "sp-hant", 7))
{
/* Southern Ping Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "zh-hans"))
if (lang_matches (&lang_str[1], limit, "zh-hans", 7))
{
/* Huizhou Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "zh-hant"))
if (lang_matches (&lang_str[1], limit, "zh-hant", 7))
{
/* Huizhou Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "zo-hans"))
if (lang_matches (&lang_str[1], limit, "zo-hans", 7))
{
/* Min Zhong Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "zo-hant"))
if (lang_matches (&lang_str[1], limit, "zo-hant", 7))
{
/* Min Zhong Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
@ -2235,14 +2235,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
}
break;
case 'g':
if (lang_matches (&lang_str[1], "an-hant-hk"))
if (lang_matches (&lang_str[1], limit, "an-hant-hk", 10))
{
/* Gan Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "an-hant-mo"))
if (lang_matches (&lang_str[1], limit, "an-hant-mo", 10))
{
/* Gan Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -2255,21 +2255,21 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "an-hans"))
if (lang_matches (&lang_str[1], limit, "an-hans", 7))
{
/* Gan Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "an-hant"))
if (lang_matches (&lang_str[1], limit, "an-hant", 7))
{
/* Gan Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "a-latg"))
if (lang_matches (&lang_str[1], limit, "a-latg", 6))
{
/* Irish; Latin (Gaelic variant) */
tags[0] = HB_TAG('I','R','T',' '); /* Irish Traditional */
@ -2308,14 +2308,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
}
break;
case 'h':
if (lang_matches (&lang_str[1], "ak-hant-hk"))
if (lang_matches (&lang_str[1], limit, "ak-hant-hk", 10))
{
/* Hakka Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "ak-hant-mo"))
if (lang_matches (&lang_str[1], limit, "ak-hant-mo", 10))
{
/* Hakka Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -2328,14 +2328,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "sn-hant-hk"))
if (lang_matches (&lang_str[1], limit, "sn-hant-hk", 10))
{
/* Xiang Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "sn-hant-mo"))
if (lang_matches (&lang_str[1], limit, "sn-hant-mo", 10))
{
/* Xiang Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -2348,28 +2348,28 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "ak-hans"))
if (lang_matches (&lang_str[1], limit, "ak-hans", 7))
{
/* Hakka Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "ak-hant"))
if (lang_matches (&lang_str[1], limit, "ak-hant", 7))
{
/* Hakka Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "sn-hans"))
if (lang_matches (&lang_str[1], limit, "sn-hans", 7))
{
/* Xiang Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "sn-hant"))
if (lang_matches (&lang_str[1], limit, "sn-hant", 7))
{
/* Xiang Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
@ -2467,7 +2467,7 @@ hb_ot_tags_from_complex_language (const char *lang_str,
}
break;
case 'l':
if (lang_matches (&lang_str[1], "zh-hans"))
if (lang_matches (&lang_str[1], limit, "zh-hans", 7))
{
/* Literary Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
@ -2476,14 +2476,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
}
break;
case 'm':
if (lang_matches (&lang_str[1], "np-hant-hk"))
if (lang_matches (&lang_str[1], limit, "np-hant-hk", 10))
{
/* Min Bei Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "np-hant-mo"))
if (lang_matches (&lang_str[1], limit, "np-hant-mo", 10))
{
/* Min Bei Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -2496,14 +2496,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "np-hans"))
if (lang_matches (&lang_str[1], limit, "np-hans", 7))
{
/* Min Bei Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "np-hant"))
if (lang_matches (&lang_str[1], limit, "np-hant", 7))
{
/* Min Bei Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
@ -2550,14 +2550,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
}
break;
case 'n':
if (lang_matches (&lang_str[1], "an-hant-hk"))
if (lang_matches (&lang_str[1], limit, "an-hant-hk", 10))
{
/* Min Nan Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "an-hant-mo"))
if (lang_matches (&lang_str[1], limit, "an-hant-mo", 10))
{
/* Min Nan Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -2570,14 +2570,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "an-hans"))
if (lang_matches (&lang_str[1], limit, "an-hans", 7))
{
/* Min Nan Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "an-hant"))
if (lang_matches (&lang_str[1], limit, "an-hant", 7))
{
/* Min Nan Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
@ -2646,14 +2646,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
}
break;
case 'w':
if (lang_matches (&lang_str[1], "uu-hant-hk"))
if (lang_matches (&lang_str[1], limit, "uu-hant-hk", 10))
{
/* Wu Chinese; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "uu-hant-mo"))
if (lang_matches (&lang_str[1], limit, "uu-hant-mo", 10))
{
/* Wu Chinese; Han (Traditional variant); Macao */
unsigned int i;
@ -2666,14 +2666,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = i;
return true;
}
if (lang_matches (&lang_str[1], "uu-hans"))
if (lang_matches (&lang_str[1], limit, "uu-hans", 7))
{
/* Wu Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "uu-hant"))
if (lang_matches (&lang_str[1], limit, "uu-hant", 7))
{
/* Wu Chinese; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */
@ -2712,7 +2712,7 @@ hb_ot_tags_from_complex_language (const char *lang_str,
}
break;
case 'y':
if (lang_matches (&lang_str[1], "ue-hans"))
if (lang_matches (&lang_str[1], limit, "ue-hans", 7))
{
/* Yue Chinese; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
@ -2721,14 +2721,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
}
break;
case 'z':
if (lang_matches (&lang_str[1], "h-hant-hk"))
if (lang_matches (&lang_str[1], limit, "h-hant-hk", 9))
{
/* Chinese [macrolanguage]; Han (Traditional variant); Hong Kong */
tags[0] = HB_TAG('Z','H','H',' '); /* Chinese, Traditional, Hong Kong SAR */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "h-hant-mo"))
if (lang_matches (&lang_str[1], limit, "h-hant-mo", 9))
{
/* Chinese [macrolanguage]; Han (Traditional variant); Macao */
unsigned int i;
@ -2748,14 +2748,14 @@ hb_ot_tags_from_complex_language (const char *lang_str,
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "h-hans"))
if (lang_matches (&lang_str[1], limit, "h-hans", 6))
{
/* Chinese [macrolanguage]; Han (Simplified variant) */
tags[0] = HB_TAG('Z','H','S',' '); /* Chinese, Simplified */
*count = 1;
return true;
}
if (lang_matches (&lang_str[1], "h-hant"))
if (lang_matches (&lang_str[1], limit, "h-hant", 6))
{
/* Chinese [macrolanguage]; Han (Traditional variant) */
tags[0] = HB_TAG('Z','H','T',' '); /* Chinese, Traditional */

11
src/hb-ot-tag.cc
View File

@ -204,13 +204,14 @@ subtag_matches (const char *lang_str,
} while (true);
}
static hb_bool_t
lang_matches (const char *lang_str, const char *spec)
static bool
lang_matches (const char *lang_str, const char *limit, const char *spec, unsigned spec_len)
{
unsigned int len = strlen (spec);
if (likely (limit - lang_str < spec_len))
return false;
return strncmp (lang_str, spec, len) == 0 &&
(lang_str[len] == '\0' || lang_str[len] == '-');
return strncmp (lang_str, spec, spec_len) == 0 &&
(lang_str[spec_len] == '\0' || lang_str[spec_len] == '-');
}
struct LangTag