| 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)) |
| 19 | void 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 | |
| 28 | void *safemalloc(size_t, size_t); |
| 29 | void *saferealloc(void *, size_t, size_t); |
| 30 | void 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 |