Navigation C API Pages Python bindings Applications


uint32_t gp_utf8_next(const char **str);

/* Typical usage */
uint32_t glyph;

while ((glyph = gp_utf8_next(&string)) {
        /* do something with glyph */

Allows to loop over characters in an UTF8 string.

int8_t gp_utf8_next_chsz(const char *str, size_t off);
int8_t gp_utf8_prev_chsz(const char *str, size_t off);

Returns how many bytes are occupied by next or previous unicode character in a string at given offset. These function allows you to jump between characters in an UTF8 string.

Returns 0 if end of string was reached.

Returns -1 on invalid byte sequence.

unsigned int gp_utf8_bytes(uint32_t unicode)

Returns how may bytes are required to encode an unicode glyph into UTF8 string.

UTF8 position

typedef struct gp_utf8_pos {
        size_t bytes;
        size_t chars;
} gp_utf8_pos;

Encodes a position in an UTF8 string, bytes stores number of actual bytes and chars stores number of unicode glyphs.

gp_utf8_pos gp_utf8_pos_first(void);

Returs position at the start of the string, i.e. {0, 0}.

gp_utf8_pos gp_utf8_pos_last(const char *str);

Returns position at the end of the string, the bytes contains the number of bytes in the string and chars number of unicode glyphs in the string.

int gp_utf8_pos_eq(gp_utf8_pos a, gp_utf8_pos b);

int gp_utf8_pos_gt(gp_utf8_pos a, gp_utf8_pos b);

int gp_utf8_pos_ge(gp_utf8_pos a, gp_utf8_pos b);

gp_utf8_pos gp_utf8_pos_sub(gp_utf8_pos a, gp_utf8_pos b);

gp_utf8_pos gp_utf8_pos_add(gp_utf8_pos a, gp_utf8_pos b);

gp_utf8_pos gp_utf8_pos_min(gp_utf8_pos a, gp_utf8_pos b);

gp_utf8_pos gp_utf8_pos_max(gp_utf8_pos a, gp_utf8_pos b);

Comparsions and arithmetical functions for the UTF8 position, both the position a and b are supposed to be a position inside the same UTF8 string.

uint32_t gp_utf8_pos_prev(const char *str, gp_utf8_pos *pos);

uint32_t gp_utf8_pos_next(const char *str, gp_utf8_pos *pos);

Moves the UTF8 position by a one character and returns a glyph value at the new position.

Returns 0 if end of beginning of the string was reached.

ssize_t gp_utf8_pos_move(const char *str, gp_utf8_pos *cur_pos, ssize_t dir);

Tries to move the UTF8 position by dir glyphs, stops and the string beginning or end and returns how many glyphs it was able to move the postion by.