Issue 0041: Are 'A' through 'Z' always isupper in all locales?

This issue has been automatically converted from the original issue lists and some formatting may not have been preserved.

Authors: Andrew Josey, WG14
Date: 1992-12-10
Reference document: X3J11/91-076
Submitted against: C90
Status: Closed
Converted from: dr.htm, dr_041.html

Does the description in subclause 7.3.1 imply that the characters defined in subclause 5.2.1 are always classified as implied by subclause 5.2.1 regardless of the locale specified?

In particular, do the characters 'a' through 'z' and 'A' through 'Z' have to be classified as “lower case and “upper case,” respectively, in every locale?

The specific lines needing interpretation are lines 20-21 in subclause 7.3.1.6, page 103, and lines 16-17 in subclause 7.3.1.10, page 104. The word “or” can be interpreted to require a superset of the characters specified as lower/upper case in subclause 5.2.1 or to allow an implementation-defined set of characters (which might contain none of the subclause 5.2.1 designated lower/upper case characters).

Comment from WG14 on 1997-09-23:

Response

Does the description in subclause 7.3.1 imply that the characters defined in subclause 5.2.1 are always classified as implied by subclause 5.2.1 regardless of the locale specified?

Answer: By subclause 7.3.1.6 The islower function and subclause 7.3.1.10 The isupper function which refer to lower- and upper-case letters, respectively, and by subclause 5.2.1: “basic source and basic execution character sets shall have at least ... upper-case letters of the English alphabet” (with example) ... “lower-case letters of the English alphabet” (with example), and by subclause 5.2.1.2 “The single-byte characters defined in subclause 5.2.1 shall be present,” which refers to multibyte characters, therefore, yes, the characters defined in subclause 5.2.1 are always classified as implied by subclause 5.2.1 regardless of the locale specified.

Do the characters 'a' through 'z', and 'A' through 'Z', have to be classified as “lower case” and “upper case,” respectively, in every locale?

Answer: Yes, the characters 'a' through 'z', and 'A' through 'Z', have to be classified as “lower case” and “upper case,” respectively, in every locale (following the citations above).