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       strstr.3 (599B)
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            1 .TH strstr 3
            2 .SH NAME
            3 strstr - find substring in string
            4 .SH SYNOPSIS
            5 #include <string.h>
            6 
            7 char *strstr(const char *s1, const char *s2)
            8 .SH DESCRIPTION
            9 The
           10 .BR strstr ()
           11 function locates the first occurence
           12 in the string pointed to by
           13 .I s1
           14 of the sequence of characters
           15 (excluding the terminating null character)
           16 in the string pointed to by
           17 .IR s2 .
           18 .SH RETURN VALUE
           19 The
           20 .BR strchr ()
           21 function shall return a pointer to the located string
           22 or a null pointer if
           23 .I s2
           24 is not found.
           25 .PP
           26 If
           27 .I s2
           28 points to an empty string,
           29 the function returns
           30 .IR s1 .
           31 .SH STANDARDS
           32 ISO/IEC 9899:1999 Section 7.21.5.7