Zilog EZ80F916 - Manual (Page 341)

UM014423-0607 C Standard Library
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321
Macro
Character Handling
The < ctype.h > header declares several macros and functions useful for testing and map-
ping characters. In all cases, the argument is an int , the value of which is represented as
an unsigned char or equals the value of the EOF macro. If the argument has any other
value, the behavior is undefined.
Macros
NOTE: These are nonstandard macros.
Functions
The functions in this section return nonzero (true) if, and only if, the value of the argument
c conforms to that in the description of the function. The term printing character refers to
a member of a set of characters, each of which occupies one printing position on a display
device. The term control character refers to a member of a set of characters that are not
printing characters.
Character Testing
assert(expression); Tests the expression and, if false, prints the diagnostics including the
expression, file name, and line number. Also calls exit with nonzero exit
code if the expression is false.
TRUE Expands to a constant 1.
FALSE Expands to a constant 0.
int isalnum(int c); Tests for alphanumeric character.
int isalpha(int c); Tests for alphabetic character.
int iscntrl(int c); Tests for control character.
int isdigit(int c); Tests for decimal digit.
int isgraph(int c); Tests for printable character except space.
int islower(int c); Tests for lowercase character.
int isprint(int c); Tests for printable character.
int ispunct(int c); Tests for punctuation character.
int isspace(int c); Tests for white-space character.
int isupper(int c); Tests for uppercase character.
int isxdigit(int c); Tests for hexadecimal digit.