Determines whether a character is a control character.
Files
lib_ascii.h/lib_ascii.c
Prototypes
Arguments
ch
Character to examine.
Returned Value
DEF_YES,
if character is a control character;
DEF_NO,
if character is not a control character.
Required Configuration
None.
Notes / Warnings
ISO/IEC 9899:TC2, Section 7.4.1.4.(2) states that “iscntrl() ... tests for any control character”. ISO/IEC 9899:TC2, Section 7.4.(3), Note 169, states that in “the seven-bit US ASCII character set, ... the control characters are those whose values lie from 0 (NUL) through 0x1F (US), and the character 0x7F (DEL)”.