cparser_result_t
cparser_line_delete (cparser_t *parser)
{
cparser_line_t *line;
int n;
if (!VALID_PARSER(parser)) {
return CPARSER_ERR_INVALID_PARAMS;
}
line = &parser->lines[parser->cur_line];
assert(line->current <= line->last);
if (!line->last || !line->current) {
/* Line is empty or we're at the beginning of the line */
return CPARSER_ERR_NOT_EXIST;
}
/* Move all character after current position back by one */
for (n = line->current; n < line->last; n++) {
line->buf[n-1] = line->buf[n];
}
line->current--;
line->last--;
line->buf[line->last] = '\0';
/* Update the display */
parser->cfg.printc(parser, '\b');
parser->cfg.prints(parser, LINE_CURRENT(line));
parser->cfg.prints(parser, " \b");
for (n = line->current; n < line->last; n++) {
parser->cfg.printc(parser, '\b');
}
return CPARSER_OK;
}
cparser_result_t cparser_line_insert(cparser_t *parser, char ch) {
int n;
cparser_line_t *line;
if (!VALID_PARSER(parser) || !ch) {
return CPARSER_ERR_INVALID_PARAMS;
}
line = &parser->lines[parser->cur_line];
if (CPARSER_MAX_LINE_SIZE <= line->last) {
return CPARSER_ERR_OUT_OF_RES;
}
/*
* Move all characters from current to last back by 1
*/
for (n = line->last; n > line->current; n--) {
line->buf[n] = line->buf[n - 1];
}
line->buf[++line->last] = '\0';
/*
* Insert the new character and update the line display. We do not
* have full curse support here. Instead, we simply assume all
* characters are on the same line and use backspace to move the
* cursor.
*/
line->buf[line->current] = ch;
parser->cfg.printc(parser, ch);
line->current++; /* update current position */
parser->cfg.prints(parser, LINE_CURRENT(line));
/*
* Move cursor back to the current position
*/
for (n = line->current; n < line->last; n++) {
parser->cfg.printc(parser, '\b');
}
return CPARSER_OK;
}
