/*
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/*
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FUNCTION
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FUNCTION
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<<strstr>>---find string segment
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<<strstr>>---find string segment
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INDEX
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INDEX
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strstr
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strstr
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ANSI_SYNOPSIS
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ANSI_SYNOPSIS
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#include <string.h>
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#include <string.h>
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char *strstr(const char *<[s1]>, const char *<[s2]>);
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char *strstr(const char *<[s1]>, const char *<[s2]>);
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TRAD_SYNOPSIS
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TRAD_SYNOPSIS
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#include <string.h>
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#include <string.h>
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char *strstr(<[s1]>, <[s2]>)
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char *strstr(<[s1]>, <[s2]>)
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char *<[s1]>;
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char *<[s1]>;
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char *<[s2]>;
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char *<[s2]>;
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DESCRIPTION
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DESCRIPTION
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Locates the first occurence in the string pointed to by <[s1]> of
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Locates the first occurence in the string pointed to by <[s1]> of
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the sequence of characters in the string pointed to by <[s2]>
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the sequence of characters in the string pointed to by <[s2]>
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(excluding the terminating null character).
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(excluding the terminating null character).
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RETURNS
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RETURNS
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Returns a pointer to the located string segment, or a null
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Returns a pointer to the located string segment, or a null
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pointer if the string <[s2]> is not found. If <[s2]> points to
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pointer if the string <[s2]> is not found. If <[s2]> points to
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a string with zero length, the <[s1]> is returned.
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a string with zero length, the <[s1]> is returned.
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PORTABILITY
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PORTABILITY
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<<strstr>> is ANSI C.
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<<strstr>> is ANSI C.
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<<strstr>> requires no supporting OS subroutines.
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<<strstr>> requires no supporting OS subroutines.
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QUICKREF
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QUICKREF
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strstr ansi pure
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strstr ansi pure
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*/
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*/
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#include <string.h>
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#include <string.h>
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char *
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char *
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_DEFUN (strstr, (searchee, lookfor),
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_DEFUN (strstr, (searchee, lookfor),
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_CONST char *searchee _AND
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_CONST char *searchee _AND
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_CONST char *lookfor)
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_CONST char *lookfor)
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{
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{
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if (*searchee == 0)
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if (*searchee == 0)
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{
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{
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if (*lookfor)
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if (*lookfor)
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return (char *) NULL;
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return (char *) NULL;
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return (char *) searchee;
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return (char *) searchee;
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}
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}
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while (*searchee)
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while (*searchee)
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{
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{
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size_t i;
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size_t i;
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i = 0;
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i = 0;
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while (1)
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while (1)
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{
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{
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if (lookfor[i] == 0)
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if (lookfor[i] == 0)
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{
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{
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return (char *) searchee;
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return (char *) searchee;
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}
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}
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if (lookfor[i] != searchee[i])
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if (lookfor[i] != searchee[i])
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{
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{
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break;
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break;
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}
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}
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i++;
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i++;
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}
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}
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searchee++;
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searchee++;
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}
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}
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return (char *) NULL;
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return (char *) NULL;
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}
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}
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