diff options
author | John Denker <jsd@av8n.com> | 2012-06-02 18:38:28 -0700 |
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committer | John Denker <jsd@av8n.com> | 2012-06-02 18:38:28 -0700 |
commit | 78488dc84afac1398e582ae6bbaf9606d07afa1e (patch) | |
tree | 71723e916f23a6a07422587de275dece3ea60252 /checkpasswd/alloc.c | |
parent | 81b5f8f3ab26a7969956faef29a90499ece40ff5 (diff) |
checkpassword ... as downloaded
Diffstat (limited to 'checkpasswd/alloc.c')
-rw-r--r-- | checkpasswd/alloc.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/checkpasswd/alloc.c b/checkpasswd/alloc.c new file mode 100644 index 0000000..0e2d4cd --- /dev/null +++ b/checkpasswd/alloc.c @@ -0,0 +1,32 @@ +#include "alloc.h" +#include "error.h" +extern char *malloc(); +extern void free(); + +#define ALIGNMENT 16 /* XXX: assuming that this alignment is enough */ +#define SPACE 2048 /* must be multiple of ALIGNMENT */ + +typedef union { char irrelevant[ALIGNMENT]; double d; } aligned; +static aligned realspace[SPACE / ALIGNMENT]; +#define space ((char *) realspace) +static unsigned int avail = SPACE; /* multiple of ALIGNMENT; 0<=avail<=SPACE */ + +/*@null@*//*@out@*/char *alloc(n) +unsigned int n; +{ + char *x; + n = ALIGNMENT + n - (n & (ALIGNMENT - 1)); /* XXX: could overflow */ + if (n <= avail) { avail -= n; return space + avail; } + x = malloc(n); + if (!x) errno = error_nomem; + return x; +} + +void alloc_free(x) +char *x; +{ + if (x >= space) + if (x < space + SPACE) + return; /* XXX: assuming that pointers are flat */ + free(x); +} |