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ft_toupper.c
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ft_toupper.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_toupper.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: pvaladar <pvaladar@student.42lisboa.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/02/16 16:40:22 by pvaladar #+# #+# */
/* Updated: 2022/03/10 16:41:28 by pvaladar ### ########.fr */
/* */
/* ************************************************************************** */
// TOUPPER(3) Library Functions Manual TOUPPER(3)
//
// NAME
// toupper, toupper_l – lower case to upper case letter conversion
//
// LIBRARY
// Standard C Library (libc, -lc)
//
// SYNOPSIS
// #include <ctype.h>
//
// int toupper(int c);
//
// #include <ctype.h>
// #include <xlocale.h>
//
// int toupper_l(int c, locale_t loc);
//
// DESCRIPTION
// The toupper() function converts a lower-case letter to the
// corresponding uppercase letter. The argument must be
// representable as an unsigned char or the value of EOF.
//
// Although the toupper() function uses the current locale, the
// toupper_l() function may be passed a locale directly.
// See xlocale(3) for more information.
//
// RETURN VALUES
// If the argument is a lower-case letter, the toupper() function
// returns the corresponding upper-case letter if there is one;
// otherwise, the argument is returned unchanged.
int ft_toupper(int c)
{
if (c >= 'a' && c <= 'z')
return (c - ('z' - 'Z'));
return (c);
}