1 files changed, 94 insertions, 0 deletions
diff --git a/file.c b/file.c
new file mode 100644
index 0000000..78505df
--- /dev/null
+++ b/file.c
@@ -0,0 +1,94 @@
+#include "file.h"
+
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "row.h"
+#include "syntax.h"
+#include "terminal.h"
+
+char* editor_rows_to_string(struct editor_state* editor, int* buffer_length)
+{
+	int total_length = 0;
+	int j;
+
+	for (j = 0; j < editor->row_count; j++)
+		total_length += editor->rows[j].size + 1;
+
+	*buffer_length = total_length;
+
+	char* buffer = malloc(total_length);
+	char* p = buffer;
+
+	for (j = 0; j < editor->row_count; j++) {
+		memcpy(p, editor->rows[j].chars, editor->rows[j].size);
+		p += editor->rows[j].size;
+		*p = '\n';
+		p++;
+	}
+
+	return buffer;
+}
+
+void editor_open(struct editor_state* editor, char* filename)
+{
+	free(editor->filename);
+	editor->filename = strdup(filename);
+
+	editor_select_syntax_highlight(editor);
+
+	FILE* fp = fopen(filename, "r");
+	if (!fp)
+		die("fopen");
+
+	char* line = NULL;
+	size_t line_capacity = 0;
+	ssize_t line_length;
+
+	while ((line_length = getline(&line, &line_capacity, fp)) != -1) {
+		while (line_length > 0 && (line[line_length - 1] == '\n' || line[line_length - 1] == '\r'))
+			line_length--;
+
+		insert_row(editor, editor->row_count, line, line_length);
+	}
+
+	free(line);
+	fclose(fp);
+
+	editor->dirty = 0;
+}
+
+void editor_save(struct editor_state* editor)
+{
+	if (editor->filename == NULL) {
+		editor->filename = editor_prompt(editor, "Save as: %s", NULL);
+		
+		if (editor->filename == NULL)
+			return;
+
+		editor_select_syntax_highlight(editor);
+	}
+
+	int length;
+	char* buffer = editor_rows_to_string(editor, &length);
+
+	int fd = open(editor->filename, O_RDWR | O_CREAT, 0644);
+	if (fd != -1) {
+		if (ftruncate(fd, length) != -1) {
+			if (write(fd, buffer, length) == length) {
+				close(fd);
+				free(buffer);
+				editor_set_status_message(editor, "%d bytes written to disk", length);
+				editor->dirty = 0;
+				return;
+			}
+		}
+		close(fd);
+	}
+	free(buffer);
+	editor_set_status_message(editor, "Failed to write to disk: %s", strerror(errno));
+}