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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. For single C chars locales (see multibyte(3)) the
value of the argument is representable as an unsigned char or the value
of EOF.
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 argu-
ment is returned unchanged.
COMPATIBILITY
The 4.4BSD extension of accepting arguments outside of the range of the
unsigned char type in locales with large character sets is considered
obsolete and may not be supported in future releases. The towlower()
function should be used instead.
SEE ALSO
ctype(3), islower(3), multibyte(3), towlower(3)
STANDARDS
The tolower() function conforms to ISO/IEC 9899:1990 (``ISO C90'').
FreeBSD 6.2 August 21, 2004 FreeBSD 6.2
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