index(3BSD)          (BSD System Compatibility)          index(3BSD)


       NAME
             index, rindex - (BSD) string operations

       SYNOPSIS
             /usr/ucb/cc [flag . . . ] file . . .
             #include <string.h>
             char *index(char *s, char *c);
             char *rindex(char *s, char *c);

       DESCRIPTION
             These functions operate on NULL-terminated strings.  They do
             not check for overflow of any receiving string.

             index and rindex return a pointer to the first (last)
             occurrence of character c in string s, or 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.

       REFERENCES
             bstring(3BSD), malloc(3C), string(3BSD), string(3C)

       NOTICES
             For user convenience, these functions are declared in the
             optional <strings.h> header file.

             On many machines, 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 have a pointer that points to an explicit NULL
             string.  On some implementations of the C language on some
             machines, a NULL pointer, if dereferenced, would yield a NULL
             string; this highly non-portable trick was used in some
             programs.  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.

             Character movement is performed differently in different
             implementations.  Thus overlapping moves may yield surprises.








                           Copyright 1994 Novell, Inc.               Page 1