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| #include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
struct record {
void (*print)(struct record *);
void (*free)(struct record *);
union {
int integer;
char *string;
};
};
struct record *records[16];
int ask(const char * q)
{
char buff[32];
printf("%s > ", q);
fgets(buff, sizeof(buff), stdin);
return atoi(buff);
}
void rec_int_print(struct record *rec)
{
printf("Record(Type=Integer, Value=%d)\n", rec->integer);
}
void rec_str_print(struct record *rec)
{
printf("Record(Type=String, Value=%s)\n", rec->string);
}
void rec_int_free(struct record *rec)
{
free(rec);
puts("Record freed!");
}
void rec_str_free(struct record *rec)
{
free(rec->string);
free(rec);
puts("Record freed!");
}
void do_new()
{
int idx = ask("Index");
if(idx < 0 || idx > 16) {
puts("Out of index!");
return;
}
if(records[idx]) {
printf("Index #%d is used!\n", idx);
return;
}
struct record *r = records[idx] = (struct record *)malloc(sizeof(struct record));
r->print = rec_int_print;
r->free = rec_int_free;
puts("Blob type:");
puts("1. Integer");
puts("2. Text");
int type = ask("Type");
unsigned int len;
switch(type) {
case 1:
r->integer = ask("Value");
break;
case 2:
len = ask("Length");
if(len > 1024) {
puts("Length too long, please buy record service premium to store longer record!");
return;
}
r->string = malloc(len);
printf("Value > ");
fgets(r->string, len, stdin);
r->print = rec_str_print;
r->free = rec_str_free;
break;
default:
puts("Invalid type!");
return;
}
puts("Okey, we got your data. Here is it:");
r->print(r);
}
void do_del()
{
int idx = ask("Index");
records[idx]->free(records[idx]);
}
void do_dump()
{
int idx = ask("Index");
records[idx]->print(records[idx]);
}
int main()
{
alarm(600);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stdin, NULL, _IONBF, 0);
puts("Welcome to use my Record-as-a-Service (free plan)");
puts("You can only save Integer or String for 600 seconds");
puts("Pay 1,000,000,000,000,000,000,000,000 bitcoins to buy premium plan");
puts("Here is term of service. You must agree to use this service. Please read carefully!");
puts("================================================================================");
system("cat tos.txt | head -n 30 | sed -e 's/^/ /'");
puts("================================================================================");
while(1) {
puts("1. New record");
puts("2. Del record");
puts("3. Show record");
switch(ask("Act")) {
case 1:
do_new();
break;
case 2:
do_del();
break;
case 3:
do_dump();
break;
default:
puts("Bye~ Thanks for using our service!");
return 0;
}
}
}
|