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#include <config.h>
#include <c.h>
#include "variables.h"
#include <stdlib.h>
#include <assert.h>
VariableSpace
CreateVariableSpace(void)
{
struct _variable *ptr;
ptr = calloc(1, sizeof *ptr);
if (!ptr)
return NULL;
ptr->name = strdup("@");
ptr->value = strdup("");
if (!ptr->name || !ptr->value)
{
free(ptr->name);
free(ptr->value);
free(ptr);
return NULL;
}
return ptr;
}
const char *
GetVariable(VariableSpace space, const char *name)
{
struct _variable *current;
if (!space)
return NULL;
if (strspn(name, VALID_VARIABLE_CHARS) != strlen(name))
return NULL;
for (current = space; current; current = current->next)
{
#ifdef USE_ASSERT_CHECKING
assert(current->name);
assert(current->value);
#endif
if (strcmp(current->name, name) == 0)
return current->value;
}
return NULL;
}
bool
GetVariableBool(VariableSpace space, const char *name)
{
return GetVariable(space, name) != NULL ? true : false;
}
bool
SetVariable(VariableSpace space, const char *name, const char *value)
{
struct _variable *current,
*previous;
if (!space)
return false;
if (!value)
return DeleteVariable(space, name);
if (strspn(name, VALID_VARIABLE_CHARS) != strlen(name))
return false;
for (current = space; current; previous = current, current = current->next)
{
#ifdef USE_ASSERT_CHECKING
assert(current->name);
assert(current->value);
#endif
if (strcmp(current->name, name) == 0)
{
free(current->value);
current->value = strdup(value);
return current->value ? true : false;
}
}
previous->next = calloc(1, sizeof *(previous->next));
if (!previous->next)
return false;
previous->next->name = strdup(name);
if (!previous->next->name)
return false;
previous->next->value = strdup(value);
return previous->next->value ? true : false;
}
bool
DeleteVariable(VariableSpace space, const char *name)
{
struct _variable *current,
*previous;
if (!space)
return false;
if (strspn(name, VALID_VARIABLE_CHARS) != strlen(name))
return false;
for (current = space, previous = NULL; current; previous = current, current = current->next)
{
#ifdef USE_ASSERT_CHECKING
assert(current->name);
assert(current->value);
#endif
if (strcmp(current->name, name) == 0)
{
free(current->name);
free(current->value);
if (previous)
previous->next = current->next;
free(current);
return true;
}
}
return true;
}
void
DestroyVariableSpace(VariableSpace space)
{
if (!space)
return;
DestroyVariableSpace(space->next);
free(space);
}
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