Defect in XSH strdup -- duplicate a string

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        Defect report from : Alexander Terekhov , IBM

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@ page 1415 line 43742 section strdup -- duplicate a string editorial 
{alt-strdup-2003-09-19}

Problem:

Edition of Specification (Year): 2003

Defect code :  1. Error

The standard says:

43742 The strdup() function may fail if:
43743 [ENOMEM] Storage space available is insufficient.

"may" is wrong. Resource-not-available errors are mandatory.

Action:

Replace "may" with "shall".

Unfortunately, there are many other places that also need 
similar patching. Consistency, you know. If you accept
that change, more DRs will follow.