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lib: charset: upper/lower case conversion

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Provide functions for upper and lower case conversion.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2018-09-04 19:34:56 +02:00 • committed by Alexander Graf
parent 5b2118a2ad
commit b5130a8125
3 changed files with 73 additions and 0 deletions
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47
lib/charset.c
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@ -6,8 +6,18 @@
*/
#include <charset.h>
#include <capitalization.h>
#include <malloc.h>
static struct capitalization_table capitalization_table[] =
#ifdef CONFIG_EFI_UNICODE_CAPITALIZATION
UNICODE_CAPITALIZATION_TABLE;
#elif CONFIG_FAT_DEFAULT_CODEPAGE == 1250
CP1250_CAPITALIZATION_TABLE;
#else
CP437_CAPITALIZATION_TABLE;
#endif
s32 utf8_get(const char **src)
{
s32 code = 0;
@ -241,6 +251,43 @@ int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count)
return 0;
}
s32 utf_to_lower(const s32 code)
{
struct capitalization_table *pos = capitalization_table;
s32 ret = code;
if (code <= 0x7f) {
if (code >= 'A' && code <= 'Z')
ret += 0x20;
return ret;
}
for (; pos->upper; ++pos) {
if (pos->upper == code) {
ret = pos->lower;
break;
}
}
return ret;
}
s32 utf_to_upper(const s32 code)
{
struct capitalization_table *pos = capitalization_table;
s32 ret = code;
if (code <= 0x7f) {
if (code >= 'a' && code <= 'z')
ret -= 0x20;
return ret;
}
for (; pos->lower; ++pos) {
if (pos->lower == code) {
ret = pos->upper;
break;
}
}
return ret;
}
size_t u16_strlen(const u16 *in)
{