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42 lines
745 B
C
42 lines
745 B
C
#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <syscall.h>
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void* malloc(size_t size) {
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return (void*)syscall(SYS_MALLOC, size, 0, 0);
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}
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void* calloc(size_t count, size_t size) {
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size_t total = count * size;
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void* ptr = malloc(total);
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if (!ptr) { return NULL; }
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memset(ptr, 0, total);
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return ptr;
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}
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void* realloc(void* ptr, size_t size) {
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if (size == 0) {
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free(ptr);
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return NULL;
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}
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if (ptr == NULL) { return malloc(size); }
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void* newptr = malloc(size);
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if (!newptr) { return NULL; }
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// TODO: retrieve the old size
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memcpy(newptr, ptr, size);
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free(ptr);
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return newptr;
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}
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void free(void* ptr) {
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syscall(SYS_FREE, (int)ptr, 0, 0);
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}
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