Mercurial > hg > ucx / file revision

 /*

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

  *

  * Copyright 2013 Olaf Wintermann. All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   1. Redistributions of source code must retain the above copyright

  *      notice, this list of conditions and the following disclaimer.

  *

  *   2. Redistributions in binary form must reproduce the above copyright

  *      notice, this list of conditions and the following disclaimer in the

  *      documentation and/or other materials provided with the distribution.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  * POSSIBILITY OF SUCH DAMAGE.

  */

 #include "list.h"

 UcxList *ucx_list_clone(UcxList *l, copy_func fnc, void *data) {

     UcxList *ret = NULL;

     while (l != NULL) {

         if (fnc != NULL) {

             ret = ucx_list_append(ret, fnc(l->data, data));

         } else {

             ret = ucx_list_append(ret, l->data);

         }

         l = l->next;

     }

     return ret;

 }

 int ucx_list_equals(const UcxList *l1, const UcxList *l2,

         cmp_func fnc, void* data) {

     if (l1 == l2) return 1;

     while (l1 != NULL && l2 != NULL) {

         if (fnc == NULL) {

             if (l1->data != l2->data) return 0;

         } else {

             if (fnc(l1->data, l2->data, data) != 0) return 0;

         }

         l1 = l1->next;

         l2 = l2->next;

     }

     return (l1 == NULL && l2 == NULL);

 }

 void ucx_list_free(UcxList *l) {

     UcxList *e = l, *f;

     while (e != NULL) {

         f = e;

         e = e->next;

         free(f);

     }

 }

 UcxList *ucx_list_append(UcxList *l, void *data)  {

     UcxList *nl = (UcxList*) malloc(sizeof(UcxList));

     if (nl == NULL) return NULL;

     nl->data = data;

     nl->next = NULL;

     if (l == NULL) {

         return nl;

     } else {

         UcxList *t = ucx_list_last(l);

         t->next = nl;

         return l;

     }

 }

 UcxList *ucx_list_prepend(UcxList *l, void *data) {

     UcxList *nl = ucx_list_append(NULL, data);

     if (nl == NULL) return NULL;

     if (l != NULL) {

         nl->next = l;

     }

     return nl;

 }

 UcxList *ucx_list_concat(UcxList *l1, UcxList *l2) {

     if (l1 == NULL) {

         return l2;

     } else {

         UcxList *last = ucx_list_last(l1);

         last->next = l2;

         return l1;

     }

 }

 UcxList *ucx_list_last(const UcxList *l) {

     if (l == NULL) return NULL;

     const UcxList *e = l;

     while (e->next != NULL) {

         e = e->next;

     }

     return (UcxList*)e;

 }

 UcxList *ucx_list_get(const UcxList *l, int index) {

     if (l == NULL) return NULL;

     const UcxList *e = l;

     while (e->next != NULL && index > 0) {

         e = e->next;

         index--;

     }

     return (UcxList*)(index == 0 ? e : NULL);

 }

 int ucx_list_contains(UcxList *l, void *elem, cmp_func fnc, void *cmpdata) {

     UCX_FOREACH(UcxList*, l, e) {

         if (!fnc(elem, e->data, cmpdata)) {

             return 1;

         }

     }

     return 0;

 }

 size_t ucx_list_size(const UcxList *l) {

     if (l == NULL) return 0;

     const UcxList *e = l;

     size_t s = 1;

     while (e->next != NULL) {

         e = e->next;

         s++;

     }

     return s;

 }

 UcxList *ucx_list_sort_merge(int length,

         UcxList* restrict ls, UcxList* restrict le, UcxList* restrict re,

         cmp_func fnc, void* data) {

     UcxList** sorted = (UcxList**) malloc(sizeof(UcxList*)*length);

     UcxList *rc, *lc;

     lc = ls; rc = le;

     int n = 0;

     while (lc && lc != le && rc != re) {

         if (fnc(lc->data, rc->data, data) <= 0) {

             sorted[n] = lc;

             lc = lc->next;

         } else {

             sorted[n] = rc;

             rc = rc->next;

         }

         n++;

     }

     while (lc && lc != le) {

         sorted[n] = lc;

         lc = lc->next;

         n++;

     }

     while (rc && rc != re) {

         sorted[n] = rc;

         rc = rc->next;

         n++;

     }

     // Update pointer

     for (int i = 0 ; i < length-1 ; i++) {

         sorted[i]->next = sorted[i+1];

     }

     sorted[length-1]->next = NULL;

     UcxList *ret = sorted[0];

     free(sorted);

     return ret;

 }

 UcxList *ucx_list_sort(UcxList *l, cmp_func fnc, void *data) {

     if (l == NULL) {

         return NULL;

     }

     UcxList *lc;

     int ln = 1;

     UcxList *restrict ls = l, *restrict le, *restrict re;

     lc = ls;

     while (lc->next != NULL && fnc(lc->next->data, lc->data, data) > 0) {

         lc = lc->next;

         ln++;

     }

     le = lc->next;

     if (le == NULL) {

         return l; // this list is already sorted :)

     } else {

         UcxList *rc;

         int rn = 1;

         rc = le;

         while (rc->next != NULL && fnc(rc->next->data, rc->data, data) > 0) {

             rc = rc->next;

             rn++;

         }

         re = rc->next;

         // Something left? Sort it!

         UcxList *remainder = re;

         size_t remainder_length = ucx_list_size(remainder);

         if (remainder != NULL) {

             remainder = ucx_list_sort(remainder, fnc, data);

         }

         // {ls,...,le->prev} and {rs,...,re->prev} are sorted - merge them

         UcxList *sorted = ucx_list_sort_merge(ln+rn,

                 ls, le, re,

                 fnc, data);

         // merge sorted list with (also sorted) remainder

         l = ucx_list_sort_merge(ln+rn+remainder_length,

                 sorted, remainder, NULL, fnc, data);

         return l;

     }

 }

 /* list specific functions */

 UcxList *ucx_list_remove(UcxList *l, UcxList *e) {

     if (e == l) {

         l = e->next;

         free(e);

     } else {

         UcxList *f = l;

         while (f->next != NULL && f->next != e) {

             f = f->next;

         }

         /* perform remove if this element is found in this list */

         if (f->next == e) {

             f->next = e->next;

             free(e);

         }

     }

     return l;

 }