int add_character(Text *text, char c)
{
size_t freespace = GAPSIZE(text);
if (freespace <= 1)
if (0 != resize_gap(text, RESIZE_BY))
return -1;
text->buf[text->gap_start++] = c;
return 0;
}
int add_string(Text *text, char *buf, size_t len)
{
size_t freespace = GAPSIZE(text);
if (freespace < len + 1)
if (0 != resize_gap(text, RESIZE_BY + len))
return -1;
memcpy(text->buf + text->gap_start, buf, len);
text->gap_start += len;
return 0;
}
int attach_file(Buffer *buffer, char *filename)
{
FILE *fp;
char buf[20];
size_t nread;
int ret;
long file_size;
char *old_filename = buffer->filename;
buffer->filename = calloc(1, strlen(filename) + 1);
if (!buffer->filename) {
buffer->filename = old_filename;
return -1;
}
strcpy(buffer->filename, filename);
if (old_filename) {
free(old_filename);
}
fp = fopen(filename, "r");
if (!fp)
return -1;
fseek(fp, 0L, SEEK_END);
file_size = ftell(fp);
fseek(fp, 0L, SEEK_SET);
resize_gap(buffer->text, file_size);
while ((nread = fread(buf, 1, sizeof buf, fp)) > 0 && !ferror(fp))
add_string(buffer->text, buf, nread);
if (ferror(fp)) {
fclose(fp);
return -1;
}
ret = fclose(fp);
if (ret) return -1;
move_cursor_to_beg(buffer->text);
return 0;
}
