33 lines
795 B
C
33 lines
795 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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char*
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cistrstr(const char *s, const char *sub)
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{
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int c, csub, n;
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csub = *sub;
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if(csub == '\0')
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return (char*)s;
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if(csub >= 'A' && csub <= 'Z')
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csub -= 'A' - 'a';
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sub++;
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n = strlen(sub);
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for(; c = *s; s++){
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if(c >= 'A' && c <= 'Z')
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c -= 'A' - 'a';
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if(c == csub && cistrncmp(s+1, sub, n) == 0)
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return (char*)s;
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}
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return nil;
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}
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