Provide functions for upper and lower case conversion.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- include/charset.h | 16 ++++++++++++++++ lib/charset.c | 41 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+)
diff --git a/include/charset.h b/include/charset.h index 1c0976dde6..6fdfaa9579 100644 --- a/include/charset.h +++ b/include/charset.h @@ -142,6 +142,22 @@ int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count); */ #define utf16_utf8_strcpy(d, s) utf16_utf8_strncpy((d), (s), SIZE_MAX)
+/** + * utf_to_lower() - convert a Unicode letter to lower case + * + * @code: letter to convert + * Return: lower case letter or unchanged letter + */ +s32 utf_to_lower(const s32 code); + +/** + * utf_to_upper() - convert a Unicode letter to upper case + * + * @code: letter to convert + * Return: upper case letter or unchanged letter + */ +s32 utf_to_upper(const s32 code); + /** * u16_strlen - count non-zero words * diff --git a/lib/charset.c b/lib/charset.c index d2c723be3c..6531b56e85 100644 --- a/lib/charset.c +++ b/lib/charset.c @@ -6,8 +6,12 @@ */
#include <charset.h> +#include <capitalization.h> #include <malloc.h>
+static struct capitalization_table capitalization_table[] = + UNICODE_CAPITALIZATION_TABLE; + s32 utf8_get(const char **src) { s32 code = 0; @@ -248,6 +252,43 @@ 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) {