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Diffstat (limited to 'utf8.h')
-rw-r--r-- | utf8.h | 90 |
1 files changed, 90 insertions, 0 deletions
@@ -0,0 +1,90 @@ +#ifndef UTF8_UTIL_H +#define UTF8_UTIL_H + +/** + * Converts the given unicode codepoint (0 - 0xffff) to utf-8 + * and stores the result at 'p'. + * + * Returns the number of utf-8 characters (1-3). + */ +int utf8_fromunicode(char *p, unsigned short uc); + +#ifndef JIM_UTF8 +#include <ctype.h> + +/* No utf-8 support. 1 byte = 1 char */ +#define utf8_strlen(S, B) (B) < 0 ? strlen(S) : (B) +#define utf8_tounicode(S, CP) (*(CP) = *(S), 1) +#define utf8_upper(C) toupper(C) +#define utf8_lower(C) tolower(C) +#define utf8_index(C, I) (I) +#define utf8_charlen(C) 1 + +#else +/** + * Returns the length of the utf-8 sequence starting with 'c'. + * + * Returns 1-4, or -1 if this is not a valid start byte. + * + * Note that charlen=4 is not supported by the rest of the API. + */ +int utf8_charlen(int c); + +/** + * Returns the number of characters in the utf-8 + * string of the given byte length. + * + * Any bytes which are not part of an valid utf-8 + * sequence are treated as individual characters. + * + * The string *must* be null terminated. + * + * Does not support unicode code points > \uffff + */ +int utf8_strlen(const char *str, int bytelen); + +/** + * Returns the byte index of the given character in the utf-8 string. + * + * The string *must* be null terminated. + * + * This will return the byte length of a utf-8 string + * if given the char length. + */ +int utf8_index(const char *str, int charindex); + +/** + * Returns the unicode codepoint corresponding to the + * utf-8 sequence 'str'. + * + * Stores the result in *uc and returns the number of bytes + * consumed. + * + * If 'str' is null terminated, then an invalid utf-8 sequence + * at the end of the string will be returned as individual bytes. + * + * If it is not null terminated, the length *must* be checked first. + * + * Does not support unicode code points > \uffff + */ +int utf8_tounicode(const char *str, int *uc); + +/** + * Returns the upper-case variant of the given unicode codepoint. + * + * Does not support unicode code points > \uffff + */ +int utf8_upper(int uc); + +/** + * Returns the lower-case variant of the given unicode codepoint. + * + * NOTE: Use utf8_upper() in preference for case-insensitive matching. + * + * Does not support unicode code points > \uffff + */ +int utf8_lower(int uc); + +#endif + +#endif |