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Save 314 bytes on not handling contexts in core

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2009-12-20 02:52:39 +01:00
parent 0d48a435a0
commit 2fbcbbc389
17 changed files with 259 additions and 243 deletions
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203
kern/env.c
View file

@ -18,34 +18,15 @@
*/
#include <grub/env.h>
#include <grub/env_private.h>
#include <grub/misc.h>
#include <grub/mm.h>
/* The size of the hash table. */
#define HASHSZ 13
/* A hashtable for quick lookup of variables. */
struct grub_env_context
{
/* A hash table for variables. */
struct grub_env_var *vars[HASHSZ];
/* One level deeper on the stack. */
struct grub_env_context *prev;
};
/* This is used for sorting only. */
struct grub_env_sorted_var
{
struct grub_env_var *var;
struct grub_env_sorted_var *next;
};
/* The initial context. */
static struct grub_env_context initial_context;
/* The current context. */
static struct grub_env_context *current_context = &initial_context;
struct grub_env_context *grub_current_context = &initial_context;
/* Return the hash representation of the string S. */
static unsigned int
@ -60,87 +41,20 @@ grub_env_hashval (const char *s)
return i % HASHSZ;
}
static struct grub_env_var *
struct grub_env_var *
grub_env_find (const char *name)
{
struct grub_env_var *var;
int idx = grub_env_hashval (name);
/* Look for the variable in the current context. */
for (var = current_context->vars[idx]; var; var = var->next)
for (var = grub_current_context->vars[idx]; var; var = var->next)
if (grub_strcmp (var->name, name) == 0)
return var;
return 0;
}
grub_err_t
grub_env_context_open (int export)
{
struct grub_env_context *context;
int i;
context = grub_zalloc (sizeof (*context));
if (! context)
return grub_errno;
context->prev = current_context;
current_context = context;
/* Copy exported variables. */
for (i = 0; i < HASHSZ; i++)
{
struct grub_env_var *var;
for (var = context->prev->vars[i]; var; var = var->next)
{
if (export && var->type == GRUB_ENV_VAR_GLOBAL)
{
if (grub_env_set (var->name, var->value) != GRUB_ERR_NONE)
{
grub_env_context_close ();
return grub_errno;
}
grub_register_variable_hook (var->name, var->read_hook, var->write_hook);
}
}
}
return GRUB_ERR_NONE;
}
grub_err_t
grub_env_context_close (void)
{
struct grub_env_context *context;
int i;
if (! current_context->prev)
grub_fatal ("cannot close the initial context");
/* Free the variables associated with this context. */
for (i = 0; i < HASHSZ; i++)
{
struct grub_env_var *p, *q;
for (p = current_context->vars[i]; p; p = q)
{
q = p->next;
grub_free (p->name);
if (p->type != GRUB_ENV_VAR_DATA)
grub_free (p->value);
grub_free (p);
}
}
/* Restore the previous context. */
context = current_context->prev;
grub_free (current_context);
current_context = context;
return GRUB_ERR_NONE;
}
static void
grub_env_insert (struct grub_env_context *context,
struct grub_env_var *var)
@ -164,18 +78,6 @@ grub_env_remove (struct grub_env_var *var)
var->next->prevp = var->prevp;
}
grub_err_t
grub_env_export (const char *name)
{
struct grub_env_var *var;
var = grub_env_find (name);
if (var)
var->type = GRUB_ENV_VAR_GLOBAL;
return GRUB_ERR_NONE;
}
grub_err_t
grub_env_set (const char *name, const char *val)
{
@ -207,9 +109,8 @@ grub_env_set (const char *name, const char *val)
if (! var)
return grub_errno;
/* This is not necessary, because GRUB_ENV_VAR_LOCAL == 0. But leave
this for readability. */
var->type = GRUB_ENV_VAR_LOCAL;
/* This is not necessary. But leave this for readability. */
var->global = 0;
var->name = grub_strdup (name);
if (! var->name)
@ -219,7 +120,7 @@ grub_env_set (const char *name, const char *val)
if (! var->value)
goto fail;
grub_env_insert (current_context, var);
grub_env_insert (grub_current_context, var);
return GRUB_ERR_NONE;
@ -263,8 +164,7 @@ grub_env_unset (const char *name)
grub_env_remove (var);
grub_free (var->name);
if (var->type != GRUB_ENV_VAR_DATA)
grub_free (var->value);
grub_free (var->value);
grub_free (var);
}
@ -280,14 +180,10 @@ grub_env_iterate (int (*func) (struct grub_env_var *var))
{
struct grub_env_var *var;
for (var = current_context->vars[i]; var; var = var->next)
for (var = grub_current_context->vars[i]; var; var = var->next)
{
struct grub_env_sorted_var *p, **q;
/* Ignore data slots. */
if (var->type == GRUB_ENV_VAR_DATA)
continue;
sorted_var = grub_malloc (sizeof (*sorted_var));
if (! sorted_var)
goto fail;
@ -343,84 +239,3 @@ grub_register_variable_hook (const char *name,
return GRUB_ERR_NONE;
}
static char *
mangle_data_slot_name (const char *name)
{
char *mangled_name;
mangled_name = grub_malloc (grub_strlen (name) + 2);
if (! mangled_name)
return 0;
grub_sprintf (mangled_name, "\e%s", name);
return mangled_name;
}
grub_err_t
grub_env_set_data_slot (const char *name, const void *ptr)
{
char *mangled_name;
struct grub_env_var *var;
mangled_name = mangle_data_slot_name (name);
if (! mangled_name)
goto fail;
/* If the variable does already exist, just update the variable. */
var = grub_env_find (mangled_name);
if (var)
{
var->value = (char *) ptr;
return GRUB_ERR_NONE;
}
/* The variable does not exist, so create a new one. */
var = grub_zalloc (sizeof (*var));
if (! var)
goto fail;
var->type = GRUB_ENV_VAR_DATA;
var->name = mangled_name;
var->value = (char *) ptr;
grub_env_insert (current_context, var);
return GRUB_ERR_NONE;
fail:
grub_free (mangled_name);
return grub_errno;
}
void *
grub_env_get_data_slot (const char *name)
{
char *mangled_name;
void *ptr = 0;
mangled_name = mangle_data_slot_name (name);
if (! mangled_name)
goto fail;
ptr = grub_env_get (mangled_name);
grub_free (mangled_name);
fail:
return ptr;
}
void
grub_env_unset_data_slot (const char *name)
{
char *mangled_name;
mangled_name = mangle_data_slot_name (name);
if (! mangled_name)
return;
grub_env_unset (mangled_name);
grub_free (mangled_name);
}