From: hackbard <hackbard>
Date: Thu, 28 Oct 2004 12:43:44 +0000 (+0000)
Subject: completed minimal list api
X-Git-Url: https://hackdaworld.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b8458ffac23aab55ba5316d28dd803dd34297181;p=my-code%2Fapi.git

completed minimal list api
---

diff --git a/list/list.c b/list/list.c
index 64a282a..895cf26 100644
--- a/list/list.c
+++ b/list/list.c
@@ -8,35 +8,52 @@
 
 int list_init(t_list *list,int outfd) {
 
-  dprintf(outfd,"[list] list initilaization ...\n");
+  dprintf(outfd,"[list] list initialization ...\n");
 
   list->outfd=outfd;
   list->start=NULL;
-  list->current=NULL;
+  list_reset(list);
 
   return L_SUCCESS;
 }
 
-int list_del_next(t_list *list,t_list_element *element) {
+int list_shutdown(t_list *list) {
 
-  t_list_element *tmp;
+  if(list->start!=NULL) list_destroy(list);
+
+  dprintf(list->outfd,"[list] shutdown\n");
+
+  return L_SUCCESS;
+}
+
+int list_next(t_list *list) {
+
+  list->current=list->current->next;
+
+  return L_SUCCESS;
+}
+
+int list_reset(t_list *list) {
+
+  list->current=list->start;
+
+  return L_SUCCESS;
+}
+
+int list_del_element(t_list *list,t_list_element *element) {
 
   if(element==NULL) {
     dprintf(list->outfd,"[list] empty element\n");
     return L_INVALID_ELEMENT;
   }
 
-  if(element->next!=NULL) {
-    dprintf(list->outfd,"[list] destroying element number %d\n"
-    tmp=element->next->next;
-    if(element->next->data!=NULL) free(element->next->data);
-    free(element->next);
-    element->next=tmp;
-  }
-  else {
-    dprintf(list->outfd,"[list] no next element\n");
-    return L_NO_NEXT_ELEMENT;
-  }
+  if(element->next!=NULL) element->next->prev=element->prev;
+  if(element->prev!=NULL) element->prev->next=element->next;
+  if(element==list->start) list->start=element->next;
+  list_reset(list);
+  if(element->data!=NULL) free(element->data);
+  free(element);
+  dprintf(list->outfd,"[list] element deleted\n");
 
   return L_SUCCESS;
 }
@@ -48,72 +65,91 @@ int list_destroy(t_list *list) {
     return L_EMPTY_LIST;
   }
 
-  list->current=list->start;
+  list_reset(list);
 
-  while(list->current->next!=NULL)
-    list_del_next(list,list->current);
+  while(list->current!=NULL) list_del_element(list,list->current);
 
   return L_SUCCESS;
 }
 
-int list_del_nr(t_list *list,int nr) {
-
-  if(list->start==NULL) {
-    dprintf(list->outfd,"[list] empty list\n");
-    return L_EMPTY_LIST;
-  }
-
-  if(list->start->number==nr) {
+int list_search_data(t_list *list,void *data,int first_bytes) {
 
-  }  
+  list_reset(list);
 
-  list->current=&(list->start);
-
-  while(list->current->next!=NULL) {
-    if(list->current->next->number==nr) {
-      list_del_next(list,list->current);
-      return L_SUCCESS;
-    }
-    list->current=list->current->next;
+  while(list->current!=NULL) {
+    if(first_bytes<=list->current->data_len)
+      if(!(memcmp(list->current->data,data,first_bytes))) return L_SUCCESS;
+    list_next(list);
   }
 
   return L_NO_SUCH_ELEMENT;
 }
 
-int list_search_data(t_list *list,void *data,int data_len) {
+int list_add_element(t_list *list,void *data,int data_len) {
 
-  t_element *help;
+  list_reset(list);
 
-  help=&(list->start);
-
-  while(help->next!=NULL) {
-    if(help->next->data_len==data_len) {
-      if(!(memcmp(help->next->data,data,data_len)) {
-        list->current=help->next;
-        return L_SUCCESS;
+  while(list->current!=NULL) {
+    if(data_len==list->current->data_len) {
+      if(!memcmp(list->current->data,data,data_len)) {
+        dprintf(list->outfd,"[list] element already in list\n");
+        return L_ELEMENT_IN_LIST;
       }
     }
-    list->current=list->current->next;
-  }
-
-  return L_NO_SUCH_ELEMENT;
-}
-
-int list_search_nr(t_list *list,int nr) {
+    if(list->current->next==NULL) {
+      list->current->next=(t_list_element *)malloc(sizeof(t_list_element));
+      if(list->current->next==NULL) {
+        dprintf(list->outfd,"[list] unable to allocate element memory\n");
+        return L_E_MEM;
+      }
+      list->current->next->prev=list->current;
+      list->current->next->next=NULL;
+      if((list->current->next->data=malloc(data_len))==NULL) {
+        dprintf(list->outfd,"[list] unable to allocate data memory\n");
+        return L_E_MEM;
+      }
+      memcpy(list->current->next->data,data,data_len);
+      list->current->next->data_len=data_len;
 
-  list->current=&(list->start);
+      dprintf(list->outfd,"[list] element added\n");
 
-  while(list->current->next!=NULL) {
-    if(list->current->next->number==nr) {
-      list->current=list->current->next;
       return L_SUCCESS;
     }
-    list->current=list->current->next;
+    else list_next(list);
   }
 
-  return L_NO_SUCH_ELEMENT;
+  /* if this is the first element */
+  list->start=(t_list_element *)malloc(sizeof(t_list_element));
+  if(list->start==NULL) {
+    dprintf(list->outfd,"[list] unable to allocate list element memory\n");
+    return L_E_MEM;
+  }
+  if((list->start->data=malloc(data_len))==NULL) {
+    dprintf(list->outfd,"[list] unable to allocate data memory\n");
+    return L_E_MEM;
+  }
+  memcpy(list->start->data,data,data_len);
+  list->start->data_len=data_len;
+  list->start->next=NULL;
+  list->start->prev=NULL;
+
+  dprintf(list->outfd,"[list] added initial element\n");
+
+  return L_SUCCESS;
 }
 
-int list_append_element(t_list *list,t_list_element *element) {
+int list_count(t_list *list) {
 
-  list->current=&(list->start);
+  int count;
+
+  count=0;
+
+  list_reset(list);
+
+  while(list->current!=NULL) {
+    list_next(list);
+    ++count;
+  }
+
+  return count;
+}
diff --git a/list/list.h b/list/list.h
index 467e751..5355a16 100644
--- a/list/list.h
+++ b/list/list.h
@@ -1,6 +1,9 @@
 /* list.h -- list headers */
 
+#define _GNU_SOURCE
 #include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
 
 #define L_SUCCESS 1
 #define L_ERROR -1
@@ -8,19 +11,30 @@
 #define L_NO_SUCH_ELEMENT -3
 #define L_INVALID_ELEMENT -4
 #define L_EMPTY_LIST -5
+#define L_ELEMENT_IN_LIST -6
+#define L_E_MEM -7
 
 typedef struct s_list_element {
+  struct s_list_element *prev;
   struct s_list_element *next;
   void *data;
   int data_len;
-  int number;
 } t_list_element;
 
 typedef struct s_list {
+  int outfd;
   t_list_element *start;
   t_list_element *current;
 } t_list;
 
 /* function prototypes */
-int list_init(t_list *list);
+int list_init(t_list *list,int outfd);
+int list_shutdown(t_list *list);
+int list_reset(t_list *list);
+int list_next(t_list *list);
+int list_del_element(t_list *list,t_list_element *element);
+int list_destroy(t_list *list);
+int list_search_data(t_list *list,void *data,int first_bytes);
+int list_add_element(t_list *list,void *data,int data_len);
+int list_count(t_list *list);