STRSTR(3P)                                          POSIX Programmer's Manual                                         STRSTR(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       strstr - find a substring

SYNOPSIS
       #include <string.h>

       char *strstr(const char *s1, const char *s2);


DESCRIPTION
       The  strstr() function shall locate the first occurrence in the string pointed to by s1 of the sequence of bytes (exclud-
       ing the terminating null byte) in the string pointed to by s2.

RETURN VALUE
       Upon successful completion, strstr() shall return a pointer to the located string or a null pointer if the string is  not
       found.

       If s2 points to a string with zero length, the function shall return s1.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       strchr(), the Base Definitions volume of IEEE Std 1003.1-2001, <string.h>

COPYRIGHT
       Portions  of  this  text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for
       Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6,  Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open  Group
       Standard   is   the   referee   document.   The   original   Standard   can   be   obtained  online  at  http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                    STRSTR(3P)