1 files changed, 101 insertions, 0 deletions
diff --git a/src/io/ft_next_line.c b/src/io/ft_next_line.c
new file mode 100644
index 0000000..59e245b
--- /dev/null
+++ b/src/io/ft_next_line.c
@@ -0,0 +1,101 @@
+#include "libft.h"
+
+static int		st_find_newline(char *str)
+{
+	int i;
+
+	i = -1;
+	while (str[++i])
+		if (str[i] == '\n')
+			return (i);
+	return (-1);
+}
+
+static int		st_free_return(char **ptr, char **ptr2, int ret)
+{
+	if (ptr != NULL)
+	{
+		free(*ptr);
+		*ptr = NULL;
+	}
+	if (ptr2 != NULL)
+	{
+		free(*ptr2);
+		*ptr2 = NULL;
+	}
+	return (ret);
+}
+
+static int		st_read_line(int fd, char **line, char *rest)
+{
+	int		ret;
+	int		split_at;
+	char	*buf;
+
+	if ((buf = malloc(sizeof(char) * (FTNL_BUFFER_SIZE + 1))) == NULL)
+		return (st_free_return(line, NULL, FTNL_STATUS_ERROR));
+	while ((ret = read(fd, buf, FTNL_BUFFER_SIZE)) > 0)
+	{
+		buf[ret] = '\0';
+		if ((split_at = st_find_newline(buf)) != -1)
+		{
+			ft_strcpy(rest, buf + split_at + 1);
+			buf[split_at] = '\0';
+			if ((*line = ft_strjoin_free(*line, buf, 1)) == NULL)
+				return (st_free_return(&buf, NULL, FTNL_STATUS_ERROR));
+			return (st_free_return(&buf, NULL, FTNL_STATUS_LINE));
+		}
+		if ((*line = ft_strjoin_free(*line, buf, 1)) == NULL)
+			return (st_free_return(&buf, NULL, FTNL_STATUS_ERROR));
+	}
+	if (ret == -1)
+		return (st_free_return(&buf, line, FTNL_STATUS_ERROR));
+	return (st_free_return(&buf, NULL, ret));
+}
+
+/*
+** if has rest:
+**     if rest has newline:
+**         push rest until newline in line, shift rest
+**         return LINE_READ
+**     else:
+**         push rest in line
+**
+** while can read fd in buf
+**     if buf has newline:
+**         push buf until newline in line
+**         push buf after newline in rest
+**         return LINE_READ
+**     push buf in line
+**
+** return FTNL_EOF
+*/
+
+int				ft_next_line(int fd, char **line)
+{
+	int			split_at;
+	static char	rest[OPEN_MAX][FTNL_BUFFER_SIZE + 1] = {{0}};
+
+	if (fd < 0 || fd > OPEN_MAX || line == NULL || FTNL_BUFFER_SIZE <= 0)
+		return (FTNL_STATUS_ERROR);
+	if ((*line = ft_strdup("")) == NULL)
+		return (FTNL_STATUS_ERROR);
+	if (rest[fd][0] == '\0')
+		return (st_read_line(fd, line, rest[fd]));
+	if ((split_at = st_find_newline(rest[fd])) != -1)
+	{
+		free(*line);
+		if ((*line = (char*)malloc(sizeof(char) * (split_at + 1))) == NULL)
+			return (FTNL_STATUS_ERROR);
+		ft_strncpy(*line, rest[fd], split_at);
+		(*line)[split_at] = '\0';
+		ft_strcpy(rest[fd], rest[fd] + split_at + 1);
+		return (FTNL_STATUS_LINE);
+	}
+	free(*line);
+	if (!(*line = (char*)malloc(sizeof(char) * (ft_strlen(rest[fd]) + 1))))
+		return (FTNL_STATUS_ERROR);
+	ft_strcpy(*line, rest[fd]);
+	rest[fd][0] = '\0';
+	return (st_read_line(fd, line, rest[fd]));
+}