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#include "file.h"
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "error.h"
#include "line.h"
#include "syntax.h"
#include "window.h"
static char *lines_to_string(struct editor_state *editor, int *buffer_length)
{
int total_length = 0;
int j;
for (j = 0; j < editor->num_lines; j++)
total_length += editor->lines[j].size + 1;
*buffer_length = total_length;
char* buffer = malloc(total_length);
char* p = buffer;
for (j = 0; j < editor->num_lines; j++) {
memcpy(p, editor->lines[j].chars, editor->lines[j].size);
p += editor->lines[j].size;
*p = '\n';
p++;
}
return buffer;
}
void editor_open(struct editor_state* editor, char* filename)
{
free(editor->filename);
size_t filename_len = strlen(filename) + 1;
editor->filename = malloc(filename_len);
memcpy(editor->filename, filename, filename_len);
editor_select_syntax_highlight(editor);
window_set_filename(filename);
/* If there is no file with this name, the editor will create it on save. */
if (access(filename, F_OK) != 0)
return;
FILE* fp = fopen(filename, "r");
if (!fp) {
fatal_error("Failed to read file from %s\n", filename);
}
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--;
editor_insert_line(editor, editor->num_lines, line, line_length);
}
free(line);
fclose(fp);
editor->dirty = 0;
}
int file_save_current_file(struct editor_state *editor)
{
/* Assume that the editor has already prompted the user for a name */
if (editor->filename == NULL)
return EINVAL;
int length;
char *buffer = lines_to_string(editor, &length);
int fd = open(editor->filename, O_RDWR | O_CREAT, 0644);
if (fd == -1)
goto fail;
if (ftruncate(fd, length) == -1)
goto fail;
if (write(fd, buffer, length) != length)
goto fail;
close(fd);
free(buffer);
editor_set_status_message(editor, "%d bytes written to disk", length);
editor->dirty = 0;
return 0;
fail:
int saved_errno = errno;
close(fd);
free(buffer);
return saved_errno;
}
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