/* ====================================================================
* Copyright 1999 Web Juice, LLC. All rights reserved.
*
* varlist.c
*
* Functions for manipulating the variable list structure in the template
* library.
*
* ==================================================================== */
#include <string.h>
#include <stdlib.h>
#include <varlist.h>
#include <template.h>
/* ====================================================================
* NAME: varlist_init
*
* DESCRIPTION: Initializes and returns a pointer to a new varlist
* structure.
*
* RETURN VALUES: Returns NULL if the memory allocation fails; otherwise
* returns a pointer to a varlist structure.
*
* BUGS: Hopefully none.
* ==================================================================== */
varlist_p
varlist_init(void)
{
varlist_p variable_list;
variable_list = (varlist_p)malloc(sizeof(varlist));
if (variable_list == NULL)
{
template_errno = TMPL_EMALLOC;
return NULL;
}
variable_list->next = NULL;
variable_list->name = NULL;
variable_list->value = NULL;
return(variable_list);
}
/* ====================================================================
* NAME: varlist_destroy
*
* DESCRIPTION: Frees up all memory associated with a varlist.
*
* RETURN VALUES: None.
*
* BUGS: Because a free()d pointer still *looks* valid, it is
* difficult to protect against the problems that arise
* if the user calls this function too early.
* ==================================================================== */
void
varlist_destroy(varlist_p variable_list)
{
varlist_p next;
if (variable_list == NULL)
{
return;
}
next = variable_list->next;
variable_list->next = NULL;
if (variable_list->name != NULL)
{
free(variable_list->name);
}
if (variable_list->value != NULL)
{
free(variable_list->value);
}
free(variable_list);
varlist_destroy(next);
}
/* ====================================================================
* NAME: varlist_get_value
*
* DESCRIPTION: Returns the value of the variable stored under the given
* name, if it exists.
*
* RETURN VALUES: This function will return NULL if there are any problems
* or if there is no value. It returns a string containing
* the value on success.
*
* BUGS: Hopefully none.
* ==================================================================== */
char *
varlist_get_value(varlist_p variable_list, char *name)
{
varlist_p current = variable_list;
while (current != NULL)
{
if ((current->name != NULL) && (current->value != NULL)
&& (strcmp(current->name, name) == 0))
{
return(current->value);
}
current = current->next;
}
template_errno = TMPL_ENOVALUE;
return NULL;
}
/* ====================================================================
* NAME: varlist_set_value
*
* DESCRIPTION: Set a variable in the given varlist to be equal to
* the value given.
*
* RETURN VALUES: Returns 0 if there's any trouble. Returns 1 if the
* variable was successfully set.
*
* BUGS: Hopefully none.
* ==================================================================== */
int
varlist_set_value(varlist_p *variable_list, char *name, char *value)
{
varlist_p new = NULL;
int length;
/* Make sure that the name and value aren't NULL */
if ((name == NULL) || (value == NULL))
{
template_errno = TMPL_ENULLARG;
return 0;
}
new = varlist_init();
if (new == NULL)
{
return 0;
}
length = strlen(name);
new->name = (char *)malloc(length + 1);
strncpy(new->name, name, length);
new->name[length] = '\0';
length = strlen(value);
new->value = (char *)malloc(length + 1);
strncpy(new->value, value, length);
new->value[length] = '\0';
new->next = *variable_list;
*variable_list = new;
return 1;
}