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

/*****************************************************************************/
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/**       Copyright 1988 by Evans & Sutherland Computer Corporation,        **/
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/**                        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 "parse.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 = (name_list *) malloc(sizeof(name_list));
    if (nptr == NULL) {
        parseWarning("unable to allocate %lu bytes for name_list",
                     (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 xclass  a pointer to the class to look for
 */
char *
LookInList(name_list * list_head, const char *name, XClassHint *xclass)
{
    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 (xclass) {
        /* look for the res_name next */
        for (nptr = list_head; nptr != NULL; nptr = nptr->next)
            if (strcmp(xclass->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(xclass->res_class, nptr->name) == 0)
                return (nptr->ptr);
    }
    return (NULL);
}

char *
LookInNameList(name_list * list_head, const 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      xclass 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, const char *name, XClassHint *xclass,
                 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 = (short) save;
            return (TRUE);
        }

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

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