void
c_insertline(char *c, char **argv) {
        c += 2;
        int line = atoi(c);
        for(; *c != 0 && *c != ' '; c++);
        c += 1; // start of text
        Row *r = b_getline(buffer, line);
        if (r == NULL) {
                printf("%i, invalid line.\n", line);
                return;
        }
        // ^ same as write line
        r = b_insert(r);
        // v same as write line
        int i = 0;
        for (;i < ROW_SIZE && c[i] != 0; i++) {
                r->text[i] = c[i];
        }
        for(;i < ROW_SIZE; i++) {
                r->text[i] = 0;
        }
}