ref: 66892eb133865ec02faa8e64cdfa2f867f9e1e87
dir: /sys/src/ape/lib/utf/utfrune.c/
/* * The authors of this software are Rob Pike and Ken Thompson. * Copyright (c) 2002 by Lucent Technologies. * Permission to use, copy, modify, and distribute this software for any * purpose without fee is hereby granted, provided that this entire notice * is included in all copies of any software which is or includes a copy * or modification of this software and in all copies of the supporting * documentation for such software. * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */ #include <stdarg.h> #include <string.h> #include "utf.h" #include "utfdef.h" char* utfrune(char *s, long c) { long c1; Rune r; int n; if(c < Runesync) /* not part of utf sequence */ return strchr(s, c); for(;;) { c1 = *(uchar*)s; if(c1 < Runeself) { /* one byte rune */ if(c1 == 0) return 0; if(c1 == c) return s; s++; continue; } n = chartorune(&r, s); if(r == c) return s; s += n; } }