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ft_tolower.c
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ft_tolower.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_tolower.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: pvaladar <pvaladar@student.42lisboa.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/02/16 16:40:19 by pvaladar #+# #+# */
/* Updated: 2022/03/10 16:41:07 by pvaladar ### ########.fr */
/* */
/* ************************************************************************** */
// TOLOWER(3) Library Functions Manual TOLOWER(3)
//
// NAME
// tolower, tolower_l – upper case to lower case letter conversion
//
// LIBRARY
// Standard C Library (libc, -lc)
//
// SYNOPSIS
// #include <ctype.h>
//
// int tolower(int c);
//
// #include <ctype.h>
// #include <xlocale.h>
//
// int tolower_l(int c, locale_t loc);
//
// DESCRIPTION
// The tolower() function converts an upper-case letter to the
// corresponding lower-case letter. The argument must be representable as
// an unsigned char or the value of EOF.
//
// Although the tolower() function uses the current locale, the tolower_l()
// function may be passed a locale directly. See xlocale(3) for more
// information.
//
// 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.
int ft_tolower(int c)
{
if (c >= 'A' && c <= 'Z')
return (c + ('z' - 'Z'));
return (c);
}