71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
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/***
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*strstr.c - search for one string inside another
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*
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* Copyright (c) 1985-2001, 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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* 09-03-93 GJF Replaced _CALLTYPE1 with __cdecl.
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* 03-14-94 GJF If string2 is empty, return string1.
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* 12-30-94 CFW Avoid 'const' warning.
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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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/***
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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 * __cdecl strstr (
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const char * str1,
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const char * str2
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)
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{
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char *cp = (char *) str1;
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char *s1, *s2;
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if ( !*str2 )
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return((char *)str1);
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while (*cp)
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{
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s1 = cp;
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s2 = (char *) str2;
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while ( *s1 && *s2 && !(*s1-*s2) )
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s1++, s2++;
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if (!*s2)
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return(cp);
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cp++;
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}
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return(NULL);
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}
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