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@airportyh
Created May 17, 2021 15:06
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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <errno.h>
#include <string.h>
#include <stdarg.h>
int error_code = 0;
#define ERROR_MESSAGE_MAX_SIZE 100
char error_message[ERROR_MESSAGE_MAX_SIZE];
void set_error(int code, char *format, ...) {
error_code = code;
va_list args;
va_start(args, format);
vsnprintf(error_message, ERROR_MESSAGE_MAX_SIZE, format, args);
error_message[ERROR_MESSAGE_MAX_SIZE - 1] = '\0';
va_end(args);
}
void clear_error() {
error_code = 0;
memset(error_message, 0, ERROR_MESSAGE_MAX_SIZE);
}
bool has_error() {
return error_code != 0;
}
void print_error() {
if (error_code != 0) {
printf("Error(%d): %s \n", error_code, error_message);
}
}
void finalize_error(void) {
print_error();
clear_error();
}
#define HARD_CALL(funcall) { \
if (funcall != 0) { \
exit(1); \
} \
#define CALL(funcall) \
if (funcall != 0) { \
return 1; \
} \
int divide(int x, int y, int *z) {
if (y == 0) {
set_error(1, "Division by zero error %d / %d", x, y);
return 1;
}
(*z) = x / y;
return 0;
}
int formula(int x, int y, int z, int *answer) {
int step1;
int step2;
CALL(divide(x, y + z, &step1));
CALL(divide(x + y, z, &step2));
CALL(divide(step1, step2, answer));
return 0;
}
int main() {
atexit(finalize_error);
int answer;
CALL(divide(4, 2, &answer));
printf("The answer is %d.\n", answer);
// CALL(divide(4, 0, &answer));
// printf("The answer is %d.\n", answer);
CALL(formula(10, 4, -4, &answer));
printf("formula answer is %d.\n", answer);
}
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