From: Lukas Jiriste <ljiriste@student.42prague.com>
Date: Wed, 10 Apr 2024 11:20:46 +0000 (+0200)
Subject: Add ft_isint function
X-Git-Url: https://git.ljiriste.work/?a=commitdiff_plain;h=f9d636c2f08b1d32ff333d50c7715b79897f09da;p=Libft.git

Add ft_isint function
---

diff --git a/Makefile b/Makefile
index 431f293..0bc20e1 100644
--- a/Makefile
+++ b/Makefile
@@ -58,6 +58,7 @@ SRCcheck:=	ft_isalnum.c			\
 			ft_islower.c			\
 			ft_isupper.c			\
 			ft_isprint.c			\
+			ft_isint.c				\
 
 SRCconv	:=	ft_itoa_base.c			\
 			ft_tolower.c			\
diff --git a/ft_check/ft_isint.c b/ft_check/ft_isint.c
new file mode 100644
index 0000000..acffdee
--- /dev/null
+++ b/ft_check/ft_isint.c
@@ -0,0 +1,45 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_isint.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: ljiriste <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/04/10 12:44:56 by ljiriste          #+#    #+#             */
+/*   Updated: 2024/04/10 13:17:33 by ljiriste         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_check.h"
+#include "libft.h"
+#include <stdlib.h>
+
+//	Checks whether str is a "pure" int
+//	that is whether the string only contains digits
+//	and whether it fits inside int
+int	ft_isint(const char *str)
+{
+	const int	num = ft_atoi(str);
+	char		*newstr;
+	int			sign;
+	int			res;
+
+	sign = 1;
+	newstr = ft_itoa(num);
+	while (ft_isspace(*str))
+		++str;
+	while (*str == '+' || *str == '-')
+	{
+		if (*str == '-')
+			sign *= -1;
+		++str;
+	}
+	while (*str == '0')
+		++str;
+	if (sign == -1)
+		res = !ft_strcmp(str, newstr + 1);
+	else
+		res = !ft_strcmp(str, newstr);
+	free(newstr);
+	return (res);
+}
diff --git a/inc/ft_check.h b/inc/ft_check.h
index 4c049dc..e640d93 100644
--- a/inc/ft_check.h
+++ b/inc/ft_check.h
@@ -6,7 +6,7 @@
 /*   By: ljiriste <ljiriste@student.42prague.com>   +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/12/09 11:55:15 by ljiriste          #+#    #+#             */
-/*   Updated: 2023/12/09 15:13:41 by ljiriste         ###   ########.fr       */
+/*   Updated: 2024/04/10 12:54:40 by ljiriste         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -21,5 +21,6 @@ int		ft_isprint(int c);
 int		ft_isspace(int c);
 int		ft_isupper(int c);
 int		ft_isascii(int c);
+int		ft_isint(const char *str);
 
 #endif