opensolaris man page for index

index(3C)						   Standard C Library Functions 						 index(3C)

NAME
       index, rindex - string operations

SYNOPSIS
       #include <strings.h>

       char *index(const char *s, int c);

       char *rindex(const char *s, int c);

DESCRIPTION
       The index() and rindex() functions operate on null-terminated strings.

       The index() function returns a pointer to the first occurrence of character c in string s.

       The rindex() function returns a pointer to the last occurrence of character c in string s.

       Both  index()  and  rindex() return a null pointer if c does not occur in the string. The null character terminating a string is considered
       to be part of the string.

USAGE
       On most modern computer systems, you can not use a null pointer to indicate a null string.  A null pointer is an error and  results  in	an
       abort  of  the  program.   If  you  wish to indicate a null string, you must use a pointer that points to an explicit null string.  On some
       machines and with some implementations of the C programming language, a null pointer, if dereferenced, would yield a null  string.   Though
       often  used,  this  practice  is not always portable. Programmers using a null pointer to represent an empty string should be aware of this
       portability issue.  Even on machines where dereferencing a null pointer does not cause an abort of the program,	it  does  not  necessarily
       yield a null string.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |ATTRIBUTE TYPE		     |ATTRIBUTE VALUE		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       bstring(3C), malloc(3C), string(3C), attributes(5), standards(5)

SunOS 5.11							    24 Jul 2002 							 index(3C)