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

ucx/list.c@27e67e725d35 (annotated)

ucx/list.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 "list.h"
 UcxList *restrict ucx_list_clone(UcxList *restrict 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 *restrict l1, UcxList *restrict 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);
 }
 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[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;
     return sorted[0];
 }
 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;
 }

Mercurial > hg > ucx / annotate

ucx/list.c@27e67e725d35 (annotated)

ucx/list.c