defer_free
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define CONCAT_(a,b) a##b
#define CONCAT(a,b) CONCAT_(a,b)
// Should they fault or ignore on 0?
// Make a more safe cast function.
struct DeferFreeStruct{
void **memory;
~DeferFreeStruct()
{
printf("Close: %s", *memory);
free(*memory);
}
};
struct DeferFcloseStruct{
FILE **file;
~DeferFcloseStruct()
{
printf("Close File\n");
fclose(*file);
}
};
#define defer_free(memory_pointer) \
DeferFreeStruct CONCAT(defer_free_unique_name_, __COUNTER__) = {(void **)&(memory_pointer)}
#define defer_fclose(file_handle) \
DeferFcloseStruct CONCAT(defer_fclose_unique_name_, __COUNTER__) = {file_handle}
char *read_file(char *file_name)
{
FILE *file = fopen(file_name, "rb");
assert(file);
defer_fclose(&file);
fseek(file,0,SEEK_END);
size_t file_size = ftell(file);
rewind(file);
char *file_data = (char *)malloc(file_size + 1);
assert(file_data);
fread(file_data, 1, file_size, file);
file_data[file_size] = 0;
return file_data;
}
int main() {
char *vera = 0;
defer_free(vera);
vera = (char *)calloc(8,1);
for(int i = 0; i < 8; ++i)
{
vera[i] = "testor\n"[i];
}
char *some_file = read_file("SomeFile.txt");
defer_free(some_file);
printf(vera);
printf(some_file);
return 0;
}
Cpp
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