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Thu Feb 12 08:51:22 IST 2015

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This file documents several things related to the 2008 POSIX standard

that I noted after reviewing it.

1. POSIX leaves undefined what happens for something like

	awk '{ print ; exit }' if=42 /etc/passwd

   Mawk diagnoses this.  Gawk and BWK awk do not. This doesn't seem to be

   worth the effort to add the code, but at least I'm aware of it.

2. The 2001-2004 standards accidentally required support for hexadecimal

   floating point constants and for Infinity and Not-A-Number (NaN) values.

   The 2008 standard now explicitly allows, but does not require, such

   support.

   More discussion is provided in the node `POSIX Floating Point Problems'

   in gawk.texi.

3. String comparison with <, <= etc is supposed to take the locale's collating

   sequence into account.  By default gawk doesn't do this. Rather, gawk

   will do this only if --posix is in effect.

4. According to POSIX, the function parameters of one function may not have

   the same name as another function, making this invalid:

	function foo() { ... }

	function bar(foo) { ...}

   Or even:

	function bar(foo) { ...}

	function foo() { ... }

   Gawk enforces this only with --posix.

The following things aren't described by POSIX but ought to be:

1. The value of $0 in an END rule

2. The return value of a function that either does return with no value

   or that falls off the end of the function body.

3. What happens with substr() if start is <= 0, or greater than the length

   of the string, or if length is <= 0.

4. Whether "next" can be invoked from a function body.