39 lines
853 B
C
39 lines
853 B
C
/*
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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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/*
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* Return pointer to first occurrence of s2 in s1,
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* 0 if none
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*/
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char*
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jehanne_strstr(const char *s1, const char *s2)
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{
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const char *p, *pa, *pb;
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int c0, c;
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c0 = *s2;
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if(c0 == 0)
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return (char*)s1;
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s2++;
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for(p=jehanne_strchr(s1, c0); p; p=jehanne_strchr(p+1, c0)) {
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pa = p;
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for(pb=s2;; pb++) {
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c = *pb;
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if(c == 0)
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return (char*)p;
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if(c != *++pa)
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break;
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}
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}
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return 0;
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}
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