Add files, first commit

1 files changed, 94 insertions, 0 deletions

diff --git a/ft_atoi.c b/ft_atoi.c
new file mode 100755
index 0000000..4633d2f
--- /dev/null
+++ b/ft_atoi.c
@@ -0,0 +1,94 @@
+/*
+Libft Copyright (C) 2026 yctct
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+int	ft_atoi(const char *nptr)
+{
+	int	i;
+	int	tmp;
+	int	nbl;
+
+	i = 0;
+	nbl = 0;
+	while (nptr[i] == 32 || (nptr[i] >= 7 && nptr[i] <= 13))
+		i++;
+	tmp = 1;
+	if (nptr[i] == '-')
+	{
+		i++;
+		tmp *= -1;
+	}
+	else if (nptr[i] == '+')
+		i++;
+	while (nptr[i] >= 48 && nptr[i] <= 57)
+	{
+		nbl = (nbl * 10) + nptr[i] - 48;
+		i++;
+	}
+	return (tmp * nbl);
+}
+
+/*
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	printf("for:          ---+--+1234ab567\n");
+	printf("ft_atoi: %i\n", ft_atoi("   --+--+1234ab567"));
+	printf("   atoi: %i\n", atoi("   ---+-+1234ab567"));
+	printf("------------------------------------\n");
+	printf("for:     3\n");
+	printf("ft_atoi: %i\n", ft_atoi("3"));
+	printf("   atoi: %i\n", atoi("3"));
+	printf("------------------------------------\n");
+	printf("for:     0\n");
+	printf("ft_atoi: %i\n", ft_atoi("0"));
+	printf("   atoi: %i\n", atoi("0"));
+	printf("------------------------------------\n");
+	printf("for:     -1\n");
+	printf("ft_atoi: %i\n", ft_atoi("-1"));
+	printf("   atoi: %i\n", atoi("-1"));
+	printf("------------------------------------\n");
+	printf("for:     2147483647\n");
+	printf("ft_atoi: %i\n", ft_atoi("2147483647"));
+	printf("   atoi: %i\n", atoi("2147483647"));
+	printf("------------------------------------\n");
+	printf("for:     -2147483648\n");
+	printf("ft_atoi: %i\n", ft_atoi("-2147483648"));
+	printf("   atoi: %i\n", atoi("-2147483648"));
+	printf("------------------------------------\n");
+	printf("for:     -2147483647\n");
+	printf("ft_atoi: %i\n", ft_atoi("-2147483647"));
+	printf("   atoi: %i\n", atoi("-2147483647"));
+	printf("------------------------------------\n");
+	printf("for:     2147483648\n");
+	printf("ft_atoi: %i\n", ft_atoi("2147483648"));
+	printf("   atoi: %i\n", atoi("2147483648"));
+	printf("------------------------------------\n");
+	printf("for:     -+27\n");
+	printf("ft_atoi: %i\n", ft_atoi("-+27"));
+	printf("   atoi: %i\n", atoi("-+27"));
+	printf("------------------------------------\n");
+	printf("for:     +27\n");
+	printf("ft_atoi: %i\n", ft_atoi("+27"));
+	printf("   atoi: %i\n", atoi("+27"));
+	printf("------------------------------------\n");
+	printf("for:     #27\n");
+	printf("ft_atoi: %i\n", ft_atoi("#27"));
+	printf("   atoi: %i\n", atoi("#27"));
+}
+*/