xref: /xsrc/external/mit/twm/dist/src/list.c

/*****************************************************************************/
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/**       Copyright 1988 by Evans & Sutherland Computer Corporation,        **/
/**                          Salt Lake City, Utah                           **/
/**                        Cambridge, Massachusetts                         **/
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/*****************************************************************************/


/**********************************************************************
 *
 * TWM code to deal with the name lists for the NoTitle list and
 * the AutoRaise list
 *
 * 11-Apr-88 Tom LaStrange        Initial Version.
 *
 **********************************************************************/

#include <stdio.h>
#include "twm.h"
#include "screen.h"
#include "gram.h"
#include "util.h"

struct name_list_struct
{
    name_list *next;    /**< pointer to the next name */
    char *name;         /**< the name of the window */
    char *ptr;          /**< list dependent data */
};

/**
 * add a window name to the appropriate list.
 *
 *	If the list does not use the ptr value, a non-null value
 *	should be placed in it.  LookInList returns this ptr value
 *	and procedures calling LookInList will check for a non-null
 *	return value as an indication of success.
 *
 *  \param list  the address of the pointer to the head of a list
 *  \param name  a pointer to the name of the window
 *  \param ptr   pointer to list dependent data
 */
void
AddToList(name_list **list_head, char *name, char *ptr)
{
    name_list *nptr;

    if (!list_head) return;	/* ignore empty inserts */

    nptr = malloc(sizeof(name_list));
    if (nptr == NULL)
    {
	twmrc_error_prefix();
	fprintf (stderr, "unable to allocate %ld bytes for name_list\n",
		 (unsigned long)sizeof(name_list));
	Done(NULL, NULL);
    }

    nptr->next = *list_head;
    nptr->name = name;
    nptr->ptr = (ptr == NULL) ? (char *)TRUE : ptr;
    *list_head = nptr;
}

/**
 * look through a list for a window name, or class
 *
 *  \return the ptr field of the list structure or NULL if the name
 *	or class was not found in the list
 *
 *	\param list   a pointer to the head of a list
 *	\param name   a pointer to the name to look for
 *  \param class  a pointer to the class to look for
 */
char *
LookInList(name_list *list_head, char *name, XClassHint *class)
{
    name_list *nptr;

    /* look for the name first */
    for (nptr = list_head; nptr != NULL; nptr = nptr->next)
	if (strcmp(name, nptr->name) == 0)
	    return (nptr->ptr);

    if (class)
    {
	/* look for the res_name next */
	for (nptr = list_head; nptr != NULL; nptr = nptr->next)
	    if (strcmp(class->res_name, nptr->name) == 0)
		return (nptr->ptr);

	/* finally look for the res_class */
	for (nptr = list_head; nptr != NULL; nptr = nptr->next)
	    if (strcmp(class->res_class, nptr->name) == 0)
		return (nptr->ptr);
    }
    return (NULL);
}

char *
LookInNameList(name_list *list_head, char *name)
{
    return (LookInList(list_head, name, NULL));
}

/**
 * look through a list for a window name, or class
 *
 *  \return TRUE  if the name was found
 *  \return FALSE if the name was not found
 *
 *  \param      list  a pointer to the head of a list
 *  \param      name  a pointer to the name to look for
 *  \param      class a pointer to the class to look for
 *	\param[out] ptr   fill in the list value if the name was found
 */
int GetColorFromList(name_list *list_head, char *name, XClassHint *class,
                     Pixel *ptr)
{
    int save;
    name_list *nptr;

    for (nptr = list_head; nptr != NULL; nptr = nptr->next)
	if (strcmp(name, nptr->name) == 0)
	{
	    save = Scr->FirstTime;
	    Scr->FirstTime = TRUE;
	    GetColor(Scr->Monochrome, ptr, nptr->ptr);
	    Scr->FirstTime = save;
	    return (TRUE);
	}

    if (class)
    {
	for (nptr = list_head; nptr != NULL; nptr = nptr->next)
	    if (strcmp(class->res_name, nptr->name) == 0)
	    {
		save = Scr->FirstTime;
		Scr->FirstTime = TRUE;
		GetColor(Scr->Monochrome, ptr, nptr->ptr);
		Scr->FirstTime = save;
		return (TRUE);
	    }

	for (nptr = list_head; nptr != NULL; nptr = nptr->next)
	    if (strcmp(class->res_class, nptr->name) == 0)
	    {
		save = Scr->FirstTime;
		Scr->FirstTime = TRUE;
		GetColor(Scr->Monochrome, ptr, nptr->ptr);
		Scr->FirstTime = save;
		return (TRUE);
	    }
    }
    return (FALSE);
}

/**
 * free up a list
 */
void FreeList(name_list **list)
{
    name_list *nptr;
    name_list *tmp;

    for (nptr = *list; nptr != NULL; )
    {
	tmp = nptr->next;
	free(nptr);
	nptr = tmp;
    }
    *list = NULL;
}