source: filezilla/trunk/fuentes/src/putty/puttymem.h @ 130

Last change on this file since 130 was 130, checked in by jrpelegrina, 4 years ago

First release to xenial

File size: 1.9 KB
Line 
1/*
2 * PuTTY memory-handling header.
3 */
4
5#ifndef PUTTY_PUTTYMEM_H
6#define PUTTY_PUTTYMEM_H
7
8#include <stddef.h>                    /* for size_t */
9#include <string.h>                    /* for memcpy() */
10
11
12/* #define MALLOC_LOG  do this if you suspect putty of leaking memory */
13#ifdef MALLOC_LOG
14#define smalloc(z) (mlog(__FILE__,__LINE__), safemalloc(z,1))
15#define snmalloc(z,s) (mlog(__FILE__,__LINE__), safemalloc(z,s))
16#define srealloc(y,z) (mlog(__FILE__,__LINE__), saferealloc(y,z,1))
17#define snrealloc(y,z,s) (mlog(__FILE__,__LINE__), saferealloc(y,z,s))
18#define sfree(z) (mlog(__FILE__,__LINE__), safefree(z))
19void mlog(char *, int);
20#else
21#define smalloc(z) safemalloc(z,1)
22#define snmalloc safemalloc
23#define srealloc(y,z) saferealloc(y,z,1)
24#define snrealloc saferealloc
25#define sfree safefree
26#endif
27
28void *safemalloc(size_t, size_t);
29void *saferealloc(void *, size_t, size_t);
30void safefree(void *);
31
32/*
33 * Direct use of smalloc within the code should be avoided where
34 * possible, in favour of these type-casting macros which ensure
35 * you don't mistakenly allocate enough space for one sort of
36 * structure and assign it to a different sort of pointer.
37 *
38 * The nasty trick in sresize with sizeof arranges for the compiler,
39 * in passing, to type-check the expression ((type *)0 == (ptr)), i.e.
40 * to type-check that the input pointer is a pointer to the correct
41 * type. The construction sizeof(stuff) ? (b) : (b) looks like a
42 * violation of the first principle of safe macros, but in fact it's
43 * OK - although it _expands_ the macro parameter more than once, it
44 * only _evaluates_ it once, so it's still side-effect safe.
45 */
46#define snew(type) ((type *)snmalloc(1, sizeof(type)))
47#define snewn(n, type) ((type *)snmalloc((n), sizeof(type)))
48#define sresize(ptr, n, type)                                           \
49    ((type *)snrealloc(sizeof((type *)0 == (ptr)) ? (ptr) : (ptr),      \
50                       (n), sizeof(type)))
51
52#endif
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