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allocate memory in sizes of two powers

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This commit is contained in:
BVK Chaitanya 2010-05-19 10:15:48 +05:30
parent 04888e8787
commit dada803720
1 changed files with 20 additions and 7 deletions
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27
script/argv.c
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@ -20,8 +20,23 @@
#include <grub/mm.h>
#include <grub/script_sh.h>
#define ARG_ALLOCATION_UNIT (32 * sizeof (char))
#define ARGV_ALLOCATION_UNIT (8 * sizeof (void*))
static unsigned
round_up_exp (unsigned v)
{
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
if (sizeof (v) > 4)
v |= v >> 32;
v++;
v += (v == 0);
return v;
}
void
grub_script_argv_free (struct grub_script_argv *argv)
@ -48,7 +63,7 @@ grub_script_argv_next (struct grub_script_argv *argv)
if (argv->argc == 0)
{
p = grub_malloc (ALIGN_UP (2 * sizeof (char *), ARG_ALLOCATION_UNIT));
p = grub_malloc (2 * sizeof (char *));
if (! p)
return 1;
@ -62,8 +77,7 @@ grub_script_argv_next (struct grub_script_argv *argv)
if (! argv->args[argv->argc - 1])
return 0;
p = grub_realloc (p, ALIGN_UP ((argv->argc + 1) * sizeof (char *),
ARG_ALLOCATION_UNIT));
p = grub_realloc (p, round_up_exp ((argv->argc + 1) * sizeof (char *)));
if (! p)
return 1;
@ -86,8 +100,7 @@ grub_script_argv_append (struct grub_script_argv *argv, const char *s)
a = p ? grub_strlen (p) : 0;
b = grub_strlen (s);
p = grub_realloc (p, ALIGN_UP ((a + b + 1) * sizeof (char),
ARG_ALLOCATION_UNIT));
p = grub_realloc (p, round_up_exp ((a + b + 1) * sizeof (char)));
if (! p)
return 1;