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#ifndef __COMMON_XMALLOC_H__
#define __COMMON_XMALLOC_H__
#include <stdlib.h>
#include <string.h>
#ifndef pr_err
#error "Macro pr_err is needed."
#endif
#define __xalloc(op, size, ...) \
({ \
void *___p = op(__VA_ARGS__); \
if (!___p) \
pr_err("%s: Can't allocate %li bytes\n", __func__, (long)(size)); \
___p; \
})
#define xstrdup(str) __xalloc(strdup, strlen(str) + 1, str)
#define xmalloc(size) __xalloc(malloc, size, size)
#define xzalloc(size) __xalloc(calloc, size, 1, size)
#define xrealloc(p, size) __xalloc(realloc, size, p, size)
#define xfree(p) free(p)
#define xrealloc_safe(pptr, size) \
({ \
int __ret = -1; \
void *new = xrealloc(*pptr, size); \
if (new) { \
*pptr = new; \
__ret = 0; \
} \
__ret; \
})
#define xmemdup(ptr, size) \
({ \
void *new = xmalloc(size); \
if (new) \
memcpy(new, ptr, size); \
new; \
})
#define memzero_p(p) memset(p, 0, sizeof(*p))
#define memzero(p, size) memset(p, 0, size)
/*
* Helper for allocating trees with single xmalloc.
* This one advances the void *pointer on s bytes and
* returns the previous value. Use like this
*
* m = xmalloc(total_size);
* a = xptr_pull(&m, tree_root_t);
* a->b = xptr_pull(&m, leaf_a_t);
* a->c = xptr_pull(&m, leaf_c_t);
* ...
*/
static inline void *xptr_pull_s(void **m, size_t s)
{
void *ret = (*m);
(*m) += s;
return ret;
}
#define xptr_pull(m, type) xptr_pull_s(m, sizeof(type))
#endif /* __CR_XMALLOC_H__ */
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