36 lines
749 B
C
36 lines
749 B
C
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/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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int
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utfnlen(const char *s, int32_t m)
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{
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int c;
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int32_t n;
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Rune rune;
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const char *es;
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es = s + m;
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for(n = 0; s < es; n++) {
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c = *(uint8_t*)s;
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if(c < Runeself){
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if(c == '\0')
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break;
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s++;
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continue;
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}
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if(!fullrune(s, es-s))
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break;
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s += chartorune(&rune, s);
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}
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return n;
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}
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