TOLOWER(3C)TOLOWER(3C)NAMEtolower - transliterate upper-case characters to lower-case
SYNOPSIS
#include <ctype.h>
int tolower(int c);
DESCRIPTION
The tolower() function has as a domain a type int, the value of which
is representable as an unsigned char or the value of EOF. If the argu‐
ment has any other value, the argument is returned unchanged. If the
argument of tolower() represents an upper-case letter, and there exists
a corresponding lower-case letter (as defined by character type infor‐
mation in the program locale category LC_CTYPE), the result is the
corresponding lower-case letter. All other arguments in the domain are
returned unchanged.
RETURN VALUES
On successful completion, tolower() returns the lower-case letter cor‐
responding to the argument passed. Otherwise, it returns the argument
unchanged.
ERRORS
No errors are defined.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│CSI │ Enabled │
├────────────────────┼─────────────────┤
│Interface Stability │ Standard │
├────────────────────┼─────────────────┤
│MT-Level │ MT-Safe │
└────────────────────┴─────────────────┘
SEE ALSO_tolower(3C), setlocale(3C), attributes(5), standards(5)
Aug 14, 2002 TOLOWER(3C)
