substsubtsubst

1 files changed, 36 insertions, 0 deletions

diff --git a/libft/src/ft_strsubst.c b/libft/src/ft_strsubst.c
new file mode 100644
index 0000000..dd89917
--- /dev/null
+++ b/libft/src/ft_strsubst.c
@@ -0,0 +1,36 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strsubst.c                                      :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rbousset <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/02/14 17:19:27 by rbousset          #+#    #+#             */
+/*   Updated: 2020/02/14 17:19:29 by rbousset         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <libft.h>
+#include <stdlib.h>
+
+char
+	*ft_strsubst(char *str, const char *pattern, const char *subst)
+{
+	size_t	nlen;
+	char	*nstr;
+	char	*ptr;
+
+	if (!(ptr = ft_strnstr(str, pattern, ft_strlen(str))))
+		return (NULL);
+	nlen = ft_strlen(str) - ft_strlen(pattern) + ft_strlen(subst);
+	if (!(nstr = (char*)malloc((nlen + 1) * sizeof(char))))
+		return (NULL);
+	ft_memcpy(nstr, str, ptr - str);
+	ft_memcpy(nstr + (ptr - str), subst, ft_strlen(subst));
+	ft_memcpy(nstr + (ptr - str + ft_strlen(subst)),
+		str + (ptr - str + ft_strlen(pattern)),
+		ft_strlen(str + (ptr - str + ft_strlen(pattern))));
+	nstr[nlen + 1] = '\0';
+	ft_memdel((void*)&str);
+	return (nstr);
+}