40 lines
1 KiB
C
40 lines
1 KiB
C
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/******************************************************************************
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* Copyright (c) 2004, 2008 IBM Corporation
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* All rights reserved.
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* This program and the accompanying materials
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* are made available under the terms of the BSD License
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* which accompanies this distribution, and is available at
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* http://www.opensource.org/licenses/bsd-license.php
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*
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* Contributors:
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* IBM Corporation - initial implementation
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*****************************************************************************/
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#include <stddef.h>
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size_t strlen(const char *s);
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int strncmp(const char *s1, const char *s2, size_t n);
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char *strstr(const char *hay, const char *needle);
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char *strstr(const char *hay, const char *needle)
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{
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char *pos;
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size_t hlen, nlen;
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if (hay == NULL || needle == NULL)
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return NULL;
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hlen = strlen(hay);
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nlen = strlen(needle);
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if (nlen < 1)
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return (char *)hay;
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for (pos = (char *)hay; pos < hay + hlen; pos++) {
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if (strncmp(pos, needle, nlen) == 0) {
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return pos;
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}
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}
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return NULL;
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}
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