ref: 5fe33fb80804cadc3c934337fde81af5b7d44243
dir: /sys/man/2/runecomp/
.TH RUNECOMP 2 .SH NAME runecomp, runedecomp, fullrunenorm, runegbreak, runewbreak, utfcomp, utfdecomp, fullutfnorm, utfgbreak, utfwbreak \- multi-rune graphemes .SH SYNOPSIS .ta \w'\fLchar*xx'u .B #include <u.h> .br .B #include <libc.h> .PP .B int runecomp(Rune *dst, Rune *src, int max) .PP .B int runedecomp(Rune *dst, Rune *src, int max) .PP .B Rune* fullrunenorm(Rune *s, int n) .PP .B Rune* runegbreak(Rune *s) .PP .B Rune* runewbreak(Rune *s) .PP .B int utfcomp(char *dst, char *src, int max) .PP .B int utfdecomp(char *dst, char *src, int max) .PP .B char* fullutfnorm(char *s, int n) .PP .B char* utfgbreak(char *s) .PP .B char* utfwbreak(char *s) .SH DESCRIPTION These routines help in handling graphemes that may span multiple runes. These routines are for use in font rendering and advanced text search; most programs do not need to perform normalization. .PP .IR Runecomp , .IR runedecomp , .IR utfcomp , and .I utfdecomp perform Unicode® normalization on .IR src , storing the result in .IR dst . No more than .I max elements will be written, and the resulting string will always be null terminated. The return value is always the total number of elements required to store the transformation. If this value is larger than the supplied .I max the caller can assume the result has been truncated. .I Runecomp and .I utfcomp perform NFC normalization while .I runedecomp and .I utfdecomp perform NFD normalization. .PP .IR Fullrunenorm , and .I fullutfnorm determine if enough elements are present in .I s to perform normalization. If enough are present, a pointer is returned to the first element that begins the next context. Otherwise .I s is returned. No more then .I n elements will be read. In order to find the boundary, the first element of the next context must be peeked. .PP .I Runegbreak and .I utfgbreak search .B s for the next grapheme break opportunity. If none is found before the end of the string, .I s is returned. .PP .I Runewbreak and .I utfwbreak search .B s for the next word break opportunity. If none is found before the end of the string, .I s is returned. .SH SOURCE .B /sys/src/libc/port/mkrunetype.c .br .B /sys/src/libc/port/runenorm.c .br .B /sys/src/libc/port/runebreak.c .SH SEE ALSO Unicode® Standard Annex #15 .br Unicode® Standard Annex #29 .br .IR rune (2), .IR utf (6), .IR tcs (1) .SH HISTORY This implementation was written for 9front (March, 2023).