Database for music records written in C

This database can be compiled on Linux from a terminal using gcc filename.c.
To run the program type ./a.out followed by the return key.
a.out can be renamed by typing mv a.out newfilename.
The new file can be run by using ./newfilename.

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX 500

struct cd {
char artist[30];
char title[40];
char style[20];
}cd_list[MAX];

struct cd temp;
int counter;

void init_list(void), enter(void);
void delete(void), list(void);
void load(void), save(void), sort(void);
void copy(void), loadbackup(void), output(void);
void outputtwo(void), search(void), loadbackuptwo(void);
void searchbytitle(void);
int menu_select(void), find_free(void);

int main(void)
{
char choice;

init_list();
for(;;) {
choice = menu_select();
switch(choice) {
case 1: enter();
break;
case 2: delete();
break;
case 3: list();
break;
case 4: save();
break;
case 5: load();
break;
case 6: sort();
break;
case 7: copy();
break;
case 8: loadbackup();
break;
case 9: output();
break;
case 10: outputtwo();
break;
case 11: loadbackuptwo();
break;
case 12: search();
break;
case 13: searchbytitle();
break;
case 14: exit(0);
}
}
}

void init_list(void)
{
register int t;

for(t=1; t<MAX; ++t) cd_list[t].artist[0] ='\0';
}
int menu_select(void)
{
char s[80];
int c;

printf("\n");
printf("1.  Enter a CD\n");
printf("2.  Delete a CD\n");
printf("3.  List the file\n");
printf("4.  Save the file\n");
printf("5.  Load the file\n");
printf("6.  Sort the file\n");
printf("7.  Copy the file after saving\n");
printf("8.  Load the copied file\n");
printf("9.  Output to text file for printing or word processing\n");
printf("10. Output to a backup file with a name of your choice\n");
printf("11. Load from a backup file with a name of your choice\n");
printf("12. Search by artist\n");
printf("13. Search by title\n");
printf("14. Quit\n");
do {
printf("\nEnter your choice: ");
gets(s);
c = atoi(s);
} while(c<0 || c>14);
return c;
}

void enter(void)
{
int slot;
char s[80];

slot = find_free();

if(slot==-1) {
printf("\nList Full");
return;
}

printf("Enter artist: ");
gets(cd_list[slot].artist);
printf("Enter title: ");
gets(cd_list[slot].title);
printf("Enter style, (A)mbient, (B)lues, (F)olk, (I)nstrumental, \n");
printf("(J)azz, (M)editation, (N)ew age, (R)ock, (S)oul, (T)heme: ");
gets(cd_list[slot].style);
counter = counter +1;
}

int find_free(void)
{
register int t;

for(t=1; cd_list[t].artist[0] && t<MAX; t++)

if(t==MAX) return -1;
return t;
}

void delete(void)
{
int t;
int u;
printf("enter a record number #: ");
scanf("%i", &t);
for(u=t; u<=counter; u++){
strncpy(cd_list[u].artist, cd_list[u+1].artist, 30);
strncpy(cd_list[u].title, cd_list[u+1].title, 40);
strncpy(cd_list[u].style, cd_list[u+1].style, 20);
}
cd_list[counter].artist[0] = '\0';
cd_list[counter].title[0] = '\0';
cd_list[counter].style[0] = '\0';
counter = counter -1;

}

void list(void)
{
register int t;
int count;
count = 0;
for(t=1; t<MAX; t++) {
if(cd_list[t].artist[0]) {
count = count +1;
printf("CD number %i\n",count);
printf("%s\n", cd_list[t].artist);
printf("%s\n", cd_list[t].title);
printf("%s\n", cd_list[t].style);
printf("\n");
}
}
printf("\n\n");
}

void sort(void)
{
register int u;
register int t;
for (t=1; t<counter; t++){
for (u=t+1; u<=counter; u++)
if( strcmp(cd_list[t].artist, cd_list[u].artist) >0){
strncpy(temp.artist, cd_list[t].artist, 30);
strncpy(temp.title, cd_list[t].title, 40);
strncpy(temp.style, cd_list[t].style, 20);
strncpy(cd_list[t].artist, cd_list[u].artist, 30);
strncpy(cd_list[t].title, cd_list[u].title, 40);
strncpy(cd_list[t].style, cd_list[u].style, 20);
strncpy(cd_list[u].artist, temp.artist, 30);
strncpy(cd_list[u].title, temp.title, 40);
strncpy(cd_list[u].style, temp.style, 20);
}
}
}

void save(void)
{
FILE *fp;
register int i;

if((fp=fopen("cdlist", "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}

for(i=1; i<MAX; i++)
if(*cd_list[i].artist)
if(fwrite(&cd_list[i],
sizeof(struct cd), 1, fp)!=1)
printf("File write error.\n");

fclose(fp);
}

void load(void)
{
FILE *fp;
register int i;
if((fp=fopen("cdlist", "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}

init_list();

counter = 0;
for(i=1;  i<MAX; i++){
if(fread(&cd_list[i],
sizeof(struct cd), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter = counter +1;
}
fclose(fp);
}

void copy(void)
{
FILE *in, *out;
int c;
if ((in = fopen ("cdlist", "r")) ==NULL){
printf("Cant open %s file for reading.\n","cdlist");
return 1;
}

if ((out = fopen("cdlistbackup", "w")) ==NULL){
printf("Cant open %s for writing.\n", "cdlistbackup");
return 2;
}

while ((c = getc (in)) !=EOF)
putc (c, out);

fclose (in);
fclose(out);
printf("File has been copied.\n");
return 0;
}


void loadbackup(void)
{
FILE *fp;
register int i;

if((fp=fopen("cdlistbackup", "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}

init_list();
counter = 0;
for(i=1;  i<MAX; i++){
if(fread(&cd_list[i],
sizeof(struct cd), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter = counter +1;
}
fclose(fp);
}


void output(void)
{
int t;
int count;
FILE *stream;
count =0;
stream = fopen("cddboutput.txt", "w+");
for(t=1; t<MAX; t++) {
if(cd_list[t].artist[0]) {
count = count + 1;
fprintf(stream,"CD number %i\n",count);
fprintf(stream,"%s\n", cd_list[t].artist);
fprintf(stream,"%s\n", cd_list[t].title);
fprintf(stream,"%s\n", cd_list[t].style);
fprintf(stream,"\n");
}
}
fclose(stream);
return;
}

void outputtwo(void)
{
FILE *fp;
register int i;
char filename[30];
printf("Enter a file name.\n");
gets(filename);
printf("\n");
if((fp=fopen(filename, "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}

for(i=1; i<MAX; i++)
if(*cd_list[i].artist)
if(fwrite(&cd_list[i],
sizeof(struct cd), 1, fp)!=1)
printf("File write error.\n");

fclose(fp);
}


void loadbackuptwo(void)
{
register int i;
FILE *fp;
char filename[30];
printf("Enter a file name.\n");
gets(filename);
printf("\n");

if((fp=fopen(filename, "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}

init_list();
counter = 0;
for(i=1;  i<MAX; i++){
if(fread(&cd_list[i],
sizeof(struct cd), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter = counter +1;
}
fclose(fp);
}


void search(void)
{
int i;
char s[30];
printf("\nEnter an artist.\n");
gets(s);
for(i=1;i<MAX;i++)
{
if (strcmp(s, cd_list[i].artist)==0)
{
printf("\nRecord number: %i\n",i);
printf("\nArtist: %s\n",cd_list[i].artist);
printf("\nTitle: %s\n",cd_list[i].title);
printf("\nStyle: %s\n",cd_list[i].style);
printf("\n");
}
}
}

void searchbytitle(void)
{
int i;
char s[30];
printf("\nEnter a title.\n");
gets(s);
for(i=1;i<MAX;i++)
{
if (strcmp(s, cd_list[i].title)==0)
{
printf("\nRecord number: %i\n",i);
printf("\nArtist: %s\n",cd_list[i].artist);
printf("\nTitle: %s\n",cd_list[i].title);
printf("\nStyle: %s\n",cd_list[i].style);
printf("\n");
}
}
}