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Man Pages


Manual Reference Pages  -  TOLOWER (3)

NAME

tolower - upper case to lower case letter conversion

CONTENTS

Library
Synopsis
Description
Return Values
Compatibility
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In ctype.h int tolower int c

DESCRIPTION

The tolower function converts an upper-case letter to the corresponding lower-case letter. The argument must be representable as an
.Vt 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 argument is returned unchanged.

COMPATIBILITY

The BSD 4.4 extension of accepting arguments outside of the range of the
.Vt 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), towlower(3)

STANDARDS

The tolower function conforms to -isoC.
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