7.25.2.1 Wide character classification functions

• 7.25.2.1.1 The iswalnum function
• 7.25.2.1.2 The iswalpha function
• 7.25.2.1.3 The iswblank function
• 7.25.2.1.4 The iswcntrl function
• 7.25.2.1.5 The iswdigit function
• 7.25.2.1.6 The iswgraph function
• 7.25.2.1.7 The iswlower function
• 7.25.2.1.8 The iswprint function
• 7.25.2.1.9 The iswpunct function
• 7.25.2.1.10 The iswspace function
• 7.25.2.1.11 The iswupper function
• 7.25.2.1.12 The iswxdigit function

1

The functions in this subclause return nonzero (true) if and only if the value of the argument wc conforms to that in the description of the function.

2

Each of the following functions returns true for each wide character that corresponds (as if by a call to the wctob function) to a single-byte character for which the corresponding character classification function from 7.4.1 returns true, except that the iswgraph and iswpunct functions may differ with respect to wide characters other than L’ ‘ that are both printing and white-space wide characters.[1]

Forward References

7.24.6.1.2 The wctob function

Footnotes

[1]

For example, if the expression isalpha(wctob(wc)) evaluates to true, then the call iswalpha(wc) also returns true. But, if the expression isgraph(wctob(wc)) evaluates to true (which cannot occur for wc == L’ ‘ of course), then either iswgraph(wc) or iswprint(wc) && iswspace(wc) is true, but not both.