/*
 * Various trivial helper wrappers around standard functions
 */
#include "cache.h"

/*
 * There's no pack memory to release - but stay close to the Git
 * version so wrap this away:
 */
static inline void release_pack_memory(size_t size __used, int flag __used)
{
}

char *xstrdup(const char *str)
{
	char *ret = strdup(str);
	if (!ret) {
		release_pack_memory(strlen(str) + 1, -1);
		ret = strdup(str);
		if (!ret)
			die("Out of memory, strdup failed");
	}
	return ret;
}

void *xmalloc(size_t size)
{
	void *ret = malloc(size);
	if (!ret && !size)
		ret = malloc(1);
	if (!ret) {
		release_pack_memory(size, -1);
		ret = malloc(size);
		if (!ret && !size)
			ret = malloc(1);
		if (!ret)
			die("Out of memory, malloc failed");
	}
#ifdef XMALLOC_POISON
	memset(ret, 0xA5, size);
#endif
	return ret;
}

/*
 * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
 * "data" to the allocated memory, zero terminates the allocated memory,
 * and returns a pointer to the allocated memory. If the allocation fails,
 * the program dies.
 */
static void *xmemdupz(const void *data, size_t len)
{
	char *p = xmalloc(len + 1);
	memcpy(p, data, len);
	p[len] = '\0';
	return p;
}

char *xstrndup(const char *str, size_t len)
{
	char *p = memchr(str, '\0', len);

	return xmemdupz(str, p ? (size_t)(p - str) : len);
}

void *xrealloc(void *ptr, size_t size)
{
	void *ret = realloc(ptr, size);
	if (!ret && !size)
		ret = realloc(ptr, 1);
	if (!ret) {
		release_pack_memory(size, -1);
		ret = realloc(ptr, size);
		if (!ret && !size)
			ret = realloc(ptr, 1);
		if (!ret)
			die("Out of memory, realloc failed");
	}
	return ret;
}