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Command: tolower | Section: 3 | Source: MINIX | File: tolower.3
TOLOWER(3) FreeBSD Library Functions Manual TOLOWER(3)
NAME
tolower - upper case to lower case letter conversion
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
tolower(int c);
DESCRIPTION
The tolower() function converts an upper-case letter to the corresponding
lower-case letter.
RETURN VALUES
If the argument is an upper-case letter, the tolower() function returns
the corresponding lower-case letter if there is one; otherwise the
argument is returned unchanged.
SEE ALSO
ctype(3), isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3),
isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3),
isxdigit(3), stdio(3), toascii(3), toupper(3), ascii(7)
STANDARDS
The tolower() function conforms to ANSI X3.159-1989 ("ANSI C89").
CAVEATS
The argument to tolower() must be EOF or representable as an unsigned
char; otherwise, the behavior is undefined. See the CAVEATS section of
ctype(3) for more details.
FreeBSD 14.1-RELEASE-p8 April 17, 2008 FreeBSD 14.1-RELEASE-p8