main()
{
int nitems;
char cline[MAXLINE];
char qchar, *malloc();
Queue *qcreate();
queue = qcreate( CHAR, 5 );
printf("ready\n");
while ( gets(cline) != NULL ) {
if ( !strcmp( cline, "remove" )) {
if ( qremove( &qchar, queue ) == FAILURE ) {
printf("queue empty\n");
continue;
}
else {
printf("%c\n", qchar);
}
}
else if ( !strcmp( cline, "read" )) {
if ( qread( &qchar, queue ) == FAILURE ) {
printf("queue exhausted\n");
continue;
}
else {
printf("%c\n", qchar);
}
}
else if ( !strcmp( cline, "reset" )) {
qreset( queue );
}
else if ( !strcmp( cline, "clear" )) {
qclear( queue );
}
else if ( !strncmp( cline, "delete ", 7 )) {
if ( sscanf( cline, "delete %d", &nitems ) != 1 ) {
printf("What?\n");
continue;
}
if ( qdelete( nitems, queue ) == FAILURE )
printf("too many items\n");
}
else {
qchar = cline[0];
if ( qadd( &qchar, queue ) == FAILURE )
printf("queue full\n");
}
}
while ( qremove( &qchar, queue ) == SUCCESS )
printf("%c\n");
printf("queue empty\n");
}
int create_open_file(const char* file_name) {
int file_id = qopen(file_name, O_BINARY | O_TRUNC | O_CREAT);
if (file_id == BADADDR)
file_id = qcreate(file_name, 511);
return file_id;
}
static void print_to_error_file(const char *error_msg) {
int file_id = qopen(ERROR_FILE, O_WRONLY | O_APPEND);
if (file_id == -1)
file_id = qcreate(ERROR_FILE, 511);
if (file_id == -1) {
msg("FATAL: print_to_error_file failed!\n");
return;
}
qwrite(file_id, error_msg, strlen(error_msg));
qclose(file_id);
}
static void print_to_output_file(const char *output_msg) {
int file_id = qopen(OUTPUT_FILE, O_WRONLY | O_APPEND);
if (file_id == -1)
file_id = qcreate(OUTPUT_FILE, 511);
if (file_id == -1) {
msg("FATAL: print_to_output_file failed!\n");
return;
}
qwrite(file_id, output_msg, strlen(output_msg));
qclose(file_id);
}