@c ----------------------------------------------------------------------
@node tolower, ctype
@subheading Syntax

@example
#include <ctype.h>

int tolower(int c);
@end example

@subheading Description

This function returns @var{c}, converting it to lower case if it is
upper case.  @xref{toupper}.

@subheading Return Value

The lower case letter.

@subheading Portability

@portability ansi, posix

@subheading Example

@example
for (i=0; buf[i]; i++)
  buf[i] = tolower(buf[i]);
@end example