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From: scs@adam.mit.edu (Steve Summit)
Newsgroups: comp.unix.programmer
Subject: Re: What does index() and rindex() do ??
Keywords: index rindex
Message-ID: <1991Mar31.215415.5616@athena.mit.edu>
Date: 31 Mar 91 21:54:15 GMT
References: <375@bibsyst.UUCP> <1311@appli.se>
Sender: news@athena.mit.edu (News system)
Reply-To: scs@adam.mit.edu
Organization: Thermal Technologies, Cambridge, MA
Lines: 19

In article <1311@appli.se> niklas@appli.se (Niklas Hallqvist) writes:
>Is there something like a porting guide for C-programs under Unix?
>This guide would present the differences between all the main variants
>of Unix.  Specifically differences in library functions and ioctl commands
>are interesting.

Portable C Software, by Mark R. Horton, published in 1990 by
Prentice Hall, ISBN 0-13-868050-7, has much of what you're
looking for.

I have a historical question: can someone tell me when and why
strchr and strrchr were first introduced, replacing the V7 index
and rindex?  I presume it was in PWB or System III or something.
(I'm also curious about the other "new" str routines such as
strcspn, strpbrk, strspn, and strtok; I suspect they appeared at
about the same time.)  Please reply by mail.

                                            Steve Summit
                                            scs@adam.mit.edu