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Diffstat (limited to 'src/lib9/utf/utfrune.c')
-rw-r--r-- | src/lib9/utf/utfrune.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/lib9/utf/utfrune.c b/src/lib9/utf/utfrune.c new file mode 100644 index 000000000..b4017d26c --- /dev/null +++ b/src/lib9/utf/utfrune.c @@ -0,0 +1,46 @@ +/* + * 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" + +/* const - removed for go code */ +char* +utfrune(const char *s, Rune 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 (char*)s; + s++; + continue; + } + n = chartorune(&r, s); + if(r == c) + return (char*)s; + s += n; + } + return 0; +} |