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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [runtime/] [go-rune.c] - Rev 848
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/* go-rune.c -- rune functions for Go. Copyright 2009, 2010 The Go Authors. All rights reserved. Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. */ #include <stddef.h> #include "go-string.h" /* Get a character from the UTF-8 string STR, of length LEN. Store the Unicode character, if any, in *RUNE. Return the number of characters used from STR. */ int __go_get_rune (const unsigned char *str, size_t len, int *rune) { int c, c1, c2, c3; /* Default to the "replacement character". */ *rune = 0xfffd; if (len <= 0) return 1; c = *str; if (c <= 0x7f) { *rune = c; return 1; } if (len <= 1) return 1; c1 = str[1]; if ((c & 0xe0) == 0xc0 && (c1 & 0xc0) == 0x80) { *rune = (((c & 0x1f) << 6) + (c1 & 0x3f)); return 2; } if (len <= 2) return 1; c2 = str[2]; if ((c & 0xf0) == 0xe0 && (c1 & 0xc0) == 0x80 && (c2 & 0xc0) == 0x80) { *rune = (((c & 0xf) << 12) + ((c1 & 0x3f) << 6) + (c2 & 0x3f)); return 3; } if (len <= 3) return 1; c3 = str[3]; if ((c & 0xf8) == 0xf0 && (c1 & 0xc0) == 0x80 && (c2 & 0xc0) == 0x80 && (c3 & 0xc0) == 0x80) { *rune = (((c & 0x7) << 18) + ((c1 & 0x3f) << 12) + ((c2 & 0x3f) << 6) + (c3 & 0x3f)); return 4; } /* Invalid encoding. Return 1 so that we advance. */ return 1; }
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