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#include "MemoryManager.h"
#include "Types.h"
#include <stdlib.h>
#include <string.h>
/** M_std **/
Result
std_alloc(MemoryManager mm, void **ptr, usize size) {
if (NULL == ptr)
return R_NullArgument;
*ptr = malloc(size);
return (*ptr == NULL) ? R_Err : R_Ok;
}
Result
std_realloc(MemoryManager mm, void **ptr, usize size) {
if (NULL == ptr)
return R_NullArgument;
*ptr = realloc(*ptr, size);
return (*ptr == NULL) ? R_Err : R_Ok;
}
Result
std_free(MemoryManager mm, void **ptr) {
if (NULL == ptr)
return R_NullArgument;
free(*ptr);
*ptr = NULL;
return R_Ok;
}
Result
std_destroy(MemoryManager *mm) {
return R_Unavailable;
}
const MemoryManager M_STD = {
.alloc = &std_alloc,
.realloc = &std_realloc,
.free = &std_free,
.destroy = &std_destroy,
.priv = NULL,
};
MemoryManager
M_std() {
return (MemoryManager){
.alloc = &std_alloc,
.realloc = &std_realloc,
.free = &std_free,
.destroy = &std_destroy,
.priv = NULL,
};
}
/** M_std_tracked **/
struct MemoryTracking {
usize alloc;
void **ptrs;
};
static inline Result
MemoryTracking_store(struct MemoryTracking *mt, void *ptr) {
if (NULL == mt || NULL == ptr)
return R_NullArgument;
if (NULL == mt->ptrs || 0 == mt->alloc)
return R_Uninitialized;
usize index = 0;
while (index < mt->alloc && NULL != mt->ptrs[index]) {
++index;
}
if (index == mt->alloc) {
mt->ptrs = realloc(mt->ptrs, sizeof(void*) * (mt->alloc << 1));
memset(mt->ptrs + (sizeof(void*) * mt->alloc), 0, sizeof(void*) * mt->alloc);
if (NULL == mt->ptrs) {
mt->alloc = 0;
return R_OutOfMemory;
}
mt->alloc <<= 1;
}
mt->ptrs[index] = ptr;
return R_Ok;
}
static inline Result
MemoryTracking_remove(struct MemoryTracking *mt, void *ptr) {
if (NULL == mt || NULL == ptr)
return R_NullArgument;
if (NULL == mt->ptrs || 0 == mt->alloc)
return R_Uninitialized;
usize index = 0;
while (index < mt->alloc && ptr != mt->ptrs[index]) {
++index;
}
if (index == mt->alloc)
return R_NotFound;
mt->ptrs[index] = NULL;
return R_Ok;
}
Result
stdt_alloc(MemoryManager mm, void **ptr, usize size) {
if (NULL == ptr)
return R_NullArgument;
if (NULL == mm.priv)
return R_Uninitialized;
*ptr = malloc(size);
if (NULL == *ptr)
return R_Err;
return MemoryTracking_store(mm.priv, *ptr);
}
Result
stdt_realloc(MemoryManager mm, void **ptr, usize new_size) {
if (NULL == ptr)
return R_NullArgument;
if (NULL == mm.priv)
return R_Uninitialized;
void *ptr_orig = *ptr;
*ptr = realloc(*ptr, new_size);
if (NULL == *ptr)
return R_Err;
if (ptr_orig != *ptr) {
RETURN_NOTOK(MemoryTracking_remove(mm.priv, ptr_orig));
RETURN_NOTOK(MemoryTracking_store(mm.priv, *ptr));
}
return R_Ok;
}
Result
stdt_free(MemoryManager mm, void **ptr) {
if (NULL == ptr)
return R_NullArgument;
if (NULL == mm.priv)
return R_Uninitialized;
RETURN_NOTOK(MemoryTracking_remove(mm.priv, *ptr));
free(*ptr);
*ptr = NULL;
return R_Ok;
}
Result
stdt_destroy(MemoryManager *mm) {
if (NULL == mm)
return R_NullArgument;
if (NULL == mm->priv)
return R_Uninitialized;
struct MemoryTracking *mt = mm->priv;
for (usize i = 0; i < mt->alloc; ++i) {
if (NULL != mt->ptrs[i])
free(mt->ptrs[i]);
}
free(mt->ptrs);
free(mt);
mm->priv = NULL;
return R_Ok;
}
MemoryManager
M_std_tracked() {
struct MemoryTracking *mt = malloc(sizeof(struct MemoryTracking));
mt->alloc = 8;
mt->ptrs = malloc(sizeof(void*) * mt->alloc);
memset(mt->ptrs, 0, sizeof(void*) * mt->alloc);
return (MemoryManager) {
.alloc = &stdt_alloc,
.realloc = &stdt_realloc,
.free = &stdt_free,
.destroy = &stdt_destroy,
.priv = mt,
};
}
/* Helper functions */
char*
M_strdup(MemoryManager mm, const char* str) {
if (NULL == str)
return NULL;
char* newstr = NULL;
if (R_Ok != mm.alloc(mm, (void**)&newstr, strlen(str) + 1) ||
NULL == newstr)
{
return NULL;
}
strcpy(newstr, str);
return newstr;
}
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