if (len > 0 && string[len - 1] == '\n')	string[len - 1] = '\0';}/*   add_record   Add a new CD to the collection */void add_record(){    char catalog_number[MAX_STRING];    char cd_title[MAX_STRING];    char cd_type[MAX_STRING];    char cd_artist[MAX_STRING];    char cd_entry[MAX_STRING];    int screenrow = MESSAGE_LINE;    int screencol = 10;    clear_all_screen();    mvprintw(screenrow, screencol, "Enter new CD details");    screenrow += 2;    mvprintw(screenrow, screencol, "Catalog Number: ");    get_string(catalog_number);    screenrow++;    mvprintw(screenrow, screencol, "      CD Title: ");    get_string(cd_title);    screenrow++;    mvprintw(screenrow, screencol, "       CD Type: ");    get_string(cd_type);    screenrow++;    mvprintw(screenrow, screencol, "        Artist: ");    get_string(cd_artist);    screenrow++;    mvprintw(15, 5, "About to add this new entry:");    sprintf(cd_entry, "%s,%s,%s,%s", catalog_number, cd_title, cd_type, cd_artist);    mvprintw(17, 5, "%s", cd_entry);    refresh();    move(PROMPT_LINE, 0);    if (get_confirm()) {	insert_title(cd_entry);	strcpy(current_cd, cd_title);	strcpy(current_cat, catalog_number);    }}/*   count_cds - scan the database and count titles and tracks */void count_cds(){    FILE *titles_fp, *tracks_fp;    char entry[MAX_ENTRY];    int titles = 0;    int tracks = 0;    titles_fp = fopen(title_file, "r");    if (titles_fp) {	while (fgets(entry, MAX_ENTRY, titles_fp))	    titles++;	fclose(titles_fp);    }    tracks_fp = fopen(tracks_file, "r");    if (tracks_fp) {	while (fgets(entry, MAX_ENTRY, tracks_fp))	    tracks++;	fclose(tracks_fp);    }    mvprintw(ERROR_LINE, 0, "Database contains %d titles, with a total of %d tracks.", titles, tracks);    get_return();}/*   find_cd - locate a CD in the database   prompt for a substring to match in the database   set current_cd to the CD title */void find_cd(){    char match[MAX_STRING], entry[MAX_ENTRY];    FILE *titles_fp;    int count = 0;    char *found, *title, *catalog;    mvprintw(Q_LINE, 0, "Enter a string to search for in CD titles: ");    get_string(match);    titles_fp = fopen(title_file, "r");    if (titles_fp) {	while (fgets(entry, MAX_ENTRY, titles_fp)) {	    /* Skip past catalog number */	    catalog = entry;	    if (found = strstr(catalog, ",")) {		*found = 0;		title = found + 1;		/* Zap the next comma in the entry to reduce it to title only */		if (found = strstr(title, ",")) {		    *found = '\0';		    /* Now see if the match substring is present */		    if (found = strstr(title, match)) {			count++;			strcpy(current_cd, title);			strcpy(current_cat, catalog);		    }		}	    }	}	fclose(titles_fp);    }    if (count != 1) {	if (count == 0)	    mvprintw(ERROR_LINE, 0, "Sorry, no matching CD found. ");	if (count > 1)	    mvprintw(ERROR_LINE, 0, "Sorry, match is ambiguous: %d CDs found. ", count);	current_cd[0] = '\0';	get_return();    }}/*   remove_tracks - delete tracks from the current CD */void remove_tracks(){    FILE *tracks_fp, *temp_fp;    char entry[MAX_ENTRY];    int cat_length;    if (current_cd[0] == '\0')	return;    cat_length = strlen(current_cat);    tracks_fp = fopen(tracks_file, "r");    temp_fp = fopen(temp_file, "w");    while (fgets(entry, MAX_ENTRY, tracks_fp)) {	/* Compare catalog number and copy entry if no match */	if (strncmp(current_cat, entry, cat_length) != 0)	    fputs(entry, temp_fp);    }    fclose(tracks_fp);    fclose(temp_fp);    unlink(tracks_file);    rename(temp_file, tracks_file);}/*   remove_cd - delete the current CD from the database */void remove_cd(){    FILE *titles_fp, *temp_fp;    char entry[MAX_ENTRY];    int cat_length;    if (current_cd[0] == '\0')	return;    clear_all_screen();    mvprintw(PROMPT_LINE, 0, "About to remove CD %s: %s. ", current_cat, current_cd);    if (!get_confirm())	return;    cat_length = strlen(current_cat);    /* Copy the titles file to a temporary, ignoring this CD */    titles_fp = fopen(title_file, "r");    temp_fp = fopen(temp_file, "w");    while (fgets(entry, MAX_ENTRY, titles_fp)) {	/* Compare catalog number and copy entry if no match */	if (strncmp(current_cat, entry, cat_length) != 0)	    fputs(entry, temp_fp);    }    fclose(titles_fp);    fclose(temp_fp);    /* Delete the titles file, and rename the temporary file */    unlink(title_file);    rename(temp_file, title_file);    /* Now do the same for the tracks file */    remove_tracks();    /* Reset current CD to 'None' */    current_cd[0] = '\0';}/*   Some defines we use only for showing or entering the track information */#define BOXED_LINES    11#define BOXED_ROWS     60#define BOX_LINE_POS   8#define BOX_ROW_POS    2/*   list_tracks - list the tracks for the current CD */void list_tracks(){    FILE *tracks_fp;    char entry[MAX_ENTRY];    int cat_length;    int lines_op = 0;    WINDOW *track_pad_ptr;    int tracks = 0;    int key;    int first_line = 0;    if (current_cd[0] == '\0') {	mvprintw(ERROR_LINE, 0, "You must select a CD first. ", stdout);	get_return();	return;    }    clear_all_screen();    cat_length = strlen(current_cat);    /* First count the number of tracks for the current CD */    tracks_fp = fopen(tracks_file, "r");    if (!tracks_fp)	return;    while (fgets(entry, MAX_ENTRY, tracks_fp)) {	if (strncmp(current_cat, entry, cat_length) == 0)	    tracks++;    }    fclose(tracks_fp);    /* Make a new pad, ensure that even if there is only a single       track the PAD is large enough so the later prefresh() is always       valid.     */    track_pad_ptr = newpad(tracks + 1 + BOXED_LINES, BOXED_ROWS + 1);    if (!track_pad_ptr)	return;    tracks_fp = fopen(tracks_file, "r");    if (!tracks_fp)	return;    mvprintw(4, 0, "CD Track Listing\n");    /* write the track information into the pad */    while (fgets(entry, MAX_ENTRY, tracks_fp)) {	/* Compare catalog number and output rest of entry */	if (strncmp(current_cat, entry, cat_length) == 0) {	    mvwprintw(track_pad_ptr, lines_op++, 0, "%s", entry + cat_length + 1);	}    }    fclose(tracks_fp);    if (lines_op > BOXED_LINES) {	mvprintw(MESSAGE_LINE, 0, "Cursor keys to scroll, RETURN or q to exit");    } else {	mvprintw(MESSAGE_LINE, 0, "RETURN or q to exit");    }    wrefresh(stdscr);    keypad(stdscr, TRUE);    cbreak();    noecho();    key = 0;    while (key != 'q' && key != KEY_ENTER && key != '\n') {	if (key == KEY_UP) {	    if (first_line > 0)		first_line--;	}	if (key == KEY_DOWN) {	    if (first_line + BOXED_LINES + 1 < tracks)		first_line++;	}	/* now draw the appropriate part of the pad on the screen */	prefresh(track_pad_ptr, first_line, 0,		 BOX_LINE_POS, BOX_ROW_POS,		 BOX_LINE_POS + BOXED_LINES, BOX_ROW_POS + BOXED_ROWS);/*	wrefresh(stdscr); */	key = getch();    }    delwin(track_pad_ptr);    keypad(stdscr, FALSE);    nocbreak();    echo();}/*   update_cd - re-enter tracks for current CD   deletes all tracks for the current CD in the database   and then prompts for new ones. */void update_cd(){    FILE *tracks_fp;    char track_name[MAX_STRING];    int len;    int track = 1;    int screen_line = 1;    WINDOW *box_window_ptr;    WINDOW *sub_window_ptr;    clear_all_screen();    mvprintw(PROMPT_LINE, 0, "Re-entering tracks for CD. ");    if (!get_confirm())	return;    move(PROMPT_LINE, 0);    clrtoeol();    remove_tracks();    mvprintw(MESSAGE_LINE, 0, "Enter a blank line to finish");    tracks_fp = fopen(tracks_file, "a");    /* Just to show how, enter the information in a scrolling, boxed,       window. The trick is to set-up a sub-window, draw a box around the       edge, then add a new, scrolling, sub-window just inside the boxed       sub-window. */    box_window_ptr = subwin(stdscr, BOXED_LINES + 2, BOXED_ROWS + 2,			    BOX_LINE_POS - 1, BOX_ROW_POS - 1);    if (!box_window_ptr)	return;    box(box_window_ptr, ACS_VLINE, ACS_HLINE);    sub_window_ptr = subwin(stdscr, BOXED_LINES, BOXED_ROWS,			    BOX_LINE_POS, BOX_ROW_POS);    if (!sub_window_ptr)	return;    scrollok(sub_window_ptr, TRUE);    werase(sub_window_ptr);    touchwin(stdscr);    do {	mvwprintw(sub_window_ptr, screen_line++, BOX_ROW_POS + 2, "Track %d: ", track);	clrtoeol();	refresh();	wgetnstr(sub_window_ptr, track_name, MAX_STRING);	len = strlen(track_name);	if (len > 0 && track_name[len - 1] == '\n')	    track_name[len - 1] = '\0';	if (*track_name)	    fprintf(tracks_fp, "%s,%d,%s\n", current_cat, track, track_name);	track++;	if (screen_line > BOXED_LINES - 1) {	    /* time to start scrolling */	    scroll(sub_window_ptr);	    screen_line--;	}    } while (*track_name);    delwin(sub_window_ptr);    fclose(tracks_fp);}