ucx: ucx/dlist.c@27e67e725d35 (annotated)

ucx/dlist.c@27e67e725d35 (annotated)

ucx/dlist.c

Thu, 11 Oct 2012 11:42:31 +0200

author: Mike Becker <universe@uap-core.de>
date: Thu, 11 Oct 2012 11:42:31 +0200
changeset 67: 27e67e725d35
parent 37: ec296899d12f
child 69: fb59270b1de3
permissions: -rw-r--r--

added some qualifiers + removed pointer alias in mergesort

 #include "dlist.h"
 UcxDlist *restrict ucx_dlist_clone(UcxDlist *restrict l,
         copy_func fnc, void *data) {
     UcxDlist *ret = NULL;
     while (l != NULL) {
         if (fnc != NULL) {
             ret = ucx_dlist_append(ret, fnc(l->data, data));
         } else {
             ret = ucx_dlist_append(ret, l->data);
         }
         l = l->next;
     }
     return ret;
 }
 int ucx_dlist_equals(const UcxDlist *l1, const UcxDlist *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_dlist_free(UcxDlist *l) {
     UcxDlist *e = l, *f;
     while (e != NULL) {
         f = e;
         e = e->next;
         free(f);
     }
 }
 UcxDlist *ucx_dlist_append(UcxDlist *l, void *data)  {
     UcxDlist *nl = (UcxDlist*) malloc(sizeof(UcxDlist));
     if (nl == NULL) return NULL;
     nl->data = data;
     nl->next = NULL;
     if (l == NULL) {
         nl->prev = NULL;
         return nl;
     } else {
         UcxDlist *t = ucx_dlist_last(l);
         t->next = nl;
         nl->prev = t;
         return l;
     }
 }
 UcxDlist *ucx_dlist_prepend(UcxDlist *l, void *data) {
     UcxDlist *nl = ucx_dlist_append(NULL, data);
     if (nl == NULL) return NULL;
     if (l != NULL) {
         nl->next = l;
         l->prev = nl;
     }
     return nl;
 }
 UcxDlist *ucx_dlist_concat(UcxDlist *restrict l1, UcxDlist *restrict l2) {
     if (l1 == NULL) {
         return l2;
     } else {
         UcxDlist *last = ucx_dlist_last(l1);
         last->next = l2;
         l2->prev = last;
         return l1;
     }
 }
 UcxDlist *ucx_dlist_last(const UcxDlist *l) {
     if (l == NULL) return NULL;
     const UcxDlist *e = l;
     while (e->next != NULL) {
         e = e->next;
     }
     return (UcxDlist*)e;
 }
 UcxDlist *ucx_dlist_get(const UcxDlist *l, int index) {
     if (l == NULL) return NULL;
     const UcxDlist *e = l;
     while (e->next != NULL && index > 0) {
         e = e->next;
         index--;
     }
     return (UcxDlist*)(index == 0 ? e : NULL);
 }
 size_t ucx_dlist_size(const UcxDlist *l) {
     if (l == NULL) return 0;
     const UcxDlist *e = l;
     size_t s = 1;
     while (e->next != NULL) {
         e = e->next;
         s++;
     }
     return s;
 }
 UcxDlist *ucx_dlist_sort_merge(int length,
         UcxDlist* restrict ls, UcxDlist* restrict le, UcxDlist* restrict re,
         cmp_func fnc, void* data) {
     UcxDlist *sorted[length];
     UcxDlist *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
     sorted[0]->prev = NULL;
     for (int i = 0 ; i < length-1 ; i++) {
         sorted[i]->next = sorted[i+1];
         sorted[i+1]->prev = sorted[i];
     }
     sorted[length-1]->next = NULL;
     return sorted[0];
 }
 UcxDlist *ucx_dlist_sort(UcxDlist *l, cmp_func fnc, void *data) {
     if (l == NULL) {
         return NULL;
     }
     UcxDlist *lc;
     int ln = 1;
     UcxDlist *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 {
         UcxDlist *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!
         UcxDlist *remainder = re;
         size_t remainder_length = ucx_dlist_size(remainder);
         if (remainder != NULL) {
             remainder = ucx_dlist_sort(remainder, fnc, data);
         }
         // {ls,...,le->prev} and {rs,...,re->prev} are sorted - merge them
         UcxDlist *sorted = ucx_dlist_sort_merge(ln+rn,
                 ls, le, re,
                 fnc, data);
         // merge sorted list with (also sorted) remainder
         l = ucx_dlist_sort_merge(ln+rn+remainder_length,
                 sorted, remainder, NULL, fnc, data);
         return l;
     }
 }
 /* dlist specific functions */
 UcxDlist *ucx_dlist_first(const UcxDlist *l) {
     if (l == NULL) return NULL;
     const UcxDlist *e = l;
     while (e->prev != NULL) {
         e = e->prev;
     }
     return (UcxDlist *)e;
 }
 UcxDlist *ucx_dlist_remove(UcxDlist *l, UcxDlist *e) {
     if (e->prev == NULL) {
         if(e->next != NULL) {
             e->next->prev = NULL;
             l = e->next;
         } else {
             l = NULL;
         }
     } else {
         e->prev->next = e->next;
         e->next->prev = e->prev;
     }
     free(e);
     return l;
 }

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ucx/dlist.c@27e67e725d35 (annotated)

ucx/dlist.c