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75 lines
1.6 KiB
75 lines
1.6 KiB
/***
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*strstr.c - search for one string inside another
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*
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* Copyright (c) 1985-1991, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines strstr() - search for one string inside another
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*
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*Revision History:
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* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
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* copyright.
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* 08-14-90 SBM Removed now redundant #include <stddef.h>
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* 10-02-90 GJF New-style function declarator.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <string.h>
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#include <plstring.h>
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#include <macos\types.h>
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/***
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*char *strstr(string1, string2) - search for string2 in string1
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*
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*Purpose:
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* finds the first occurrence of string2 in string1
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*
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*Entry:
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* char *string1 - string to search in
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* char *string2 - string to search for
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*
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*Exit:
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* returns a pointer to the first occurrence of string2 in
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* string1, or NULL if string2 does not occur in string1
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*
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*Uses:
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*
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*Exceptions:
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*
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*******************************************************************************/
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char * __pascal PLstrstr(const unsigned char * str1, const unsigned char * str2)
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{
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int len = StrLength(str1);
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int len1 = StrLength(str1);
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int len2 = StrLength(str2);
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char *cp = (char *) str1+1;
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char *s1, *s2;
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/* make sure '\0' pattern always found, this is specially for both '\0'case.*/
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if (!*str2)
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{
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return ((char *)str1);
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}
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while (len)
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{
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s1 = cp;
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s2 = (char *) str2+1;
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len1 = len;
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len2 = StrLength(str2);
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while ( len1 && len2 && !(*s1-*s2) )
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s1++, s2++, len2--, len1--;
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if (!len2)
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return(cp);
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cp++;
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len--;
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}
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return(NULL);
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}
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