minishell/libft/ft_printf_utils.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_printf_utils.c                                  :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jguelen <marvin@42.fr>                     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/12/04 10:39:30 by jguelen           #+#    #+#             */
/*   Updated: 2024/12/11 14:25:40 by jguelen          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_printf.h"

/*To handle special printf behaviors regarding strings and precision.*/
static int	ft_printf_strlen(char *s, int maxchar)
{
	int	len;

	len = 0;
	if (!s)
	{
		if (maxchar > 5)
			return (6);
		return (0);
	}
	while (s[len] && len < maxchar)
		len++;
	return (len);
}

int	ft_int_len(int n, int base_len)
{
	int	len;
	int	calc;

	len = 0;
	calc = n;
	if (n == 0)
		return (1);
	while (calc != 0)
	{
		calc /= base_len;
		len++;
	}
	return (len);
}

int	ft_uint_len(unsigned int n, int base_len)
{
	int				len;
	unsigned int	calc;

	calc = n;
	len = 0;
	if (n == 0)
		return (1);
	while (calc != 0)
	{
		calc /= base_len;
		len++;
	}
	return (len);
}

/*Naming is a bit off since it can only be used for pointers*/
int	ft_ull_len(unsigned long long n, int base_len)
{
	unsigned long long	calc;
	int					len;

	len = 0;
	calc = n;
	if (n == 0)
		return (ft_strlen("(nil)"));
	while (calc != 0)
	{
		calc /= base_len;
		len++;
	}
	return (len);
}

/*Takes precision into account when relevant.*/
int	var_len(t_printf_format *format)
{
	t_printf_spec	spec;

	spec = format->specifier;
	if (spec == PRINTF_CHARSPEC || spec == PRINTF_NOSPEC
		|| spec == PRINTF_PERCENTSPEC)
		return (1);
	if (spec == PRINTF_STRINGSPEC)
	{
		if (format->flags & PRINTF_DOTFLAG)
			return (ft_printf_strlen(format->var.s, (int)format->precision));
		else
			return ((int)ft_printf_strlen(format->var.s, INT_MAX));
	}
	if (spec == PRINTF_INTSPEC)
		return (max_int(ft_int_len(format->var.i, 10), format->precision));
	if (spec == PRINTF_UINTSPEC)
		return (max_int(ft_uint_len(format->var.u, 10), format->precision));
	if (spec == PRINTF_HEXA_LOWSPEC || spec == PRINTF_HEXA_UPSPEC)
		return (max_int(ft_uint_len(format->var.u, HEX_LEN),
				format->precision));
	if (spec == PRINTF_POINTERSPEC)
		return (ft_ull_len((unsigned long long)format->var.p, HEX_LEN));
	if (ft_isnumeric_conv(format) && !format->var.i && !format->var.u)
		return (0);
	return (0);
}