complete code for del,put,get for file

temp.c

@@ -33,20 +33,23 @@ int modulus(char *num, int size, int divisor) {
 void file_del(off_t offset, char *key)
 {   
     int index=modulus(key,256,setSize);
+    fflush(stdout);
+    int length=0;
     sem_wait(&mutex[index]);
-    
     char blankspace[512];
-    memset(blankspace, 0, 512);
+     char ch;
+    int k=-1;
     lseek(fds[index], offset, SEEK_SET);
-    write(fds[index], blankspace, 512);
-
-    sem_wait(&readerLocks[index]);
-    readercount--;
-    if(readercount==0)
+    while(read(fds[index], &ch,sizeof(ch))!=-1 && ch!='\n')
     {  
-        sem_post(&mutex[index]);
+        length++;
     }
-    sem_post(&readerLocks[index]);
+    printf("length %d",length);
+    memset(blankspace, 0, length);
+    lseek(fds[index], offset, SEEK_SET);
+    write(fds[index], blankspace, length);
+    sem_post(&mutex[index]);
+    
 }
 void file_get(off_t offset, char *key, char *value)
 {   
@@ -55,18 +58,33 @@ void file_get(off_t offset, char *key, char *value)
 
     int index=modulus(key,256,setSize);
     sem_wait(&readerLocks[index]);
-    readCounters[index]++;
+    readCounters[index]+=1;
     if(readCounters[index]==1)
         sem_wait(&mutex[index]);
     sem_post(&readerLocks[index]);
     
     lseek(fds[index], offset, SEEK_SET);
-    read(fds[index], key, 256);
-    read(fds[index], value, 256);
+    char line[10];
+    //FILE *fp =fdopen(fds[index],"r+");
+   // fseek(fp, offset,SEEK_SET);
+    size_t len=0;
     
+    char ch;
+    int k=-1;
+    while(read(fds[index], &ch,sizeof(ch))!=-1 && ch!='\n')
+    {  
+        if(k>=0)
+        {
+        value[k++]=ch;
+        }
+        if(ch==':')
+        {
+            k=0;  
+        }
+    }
     sem_wait(&readerLocks[index]);
-    readercount--;
-    if(readercount==0)
+    readCounters[index]-=1;
+    if(readCounters[index]==0)
     {
         sem_post(&mutex[index]);
     }
@@ -82,9 +100,10 @@ off_t file_put(char *key,char *value) {
     sem_wait(&mutex[index]);
     printf("[Write to File: %d]\n",index);
     position = lseek(fds[index], 0, SEEK_END);
-    write(fds[index], key, 256);
-    write(fds[index], value, 256);
-    printf("bytes : %d\n",bytes);
+    char line [514];
+    snprintf(line, sizeof(line),"%s:%s\n",key,value);
+    if(write(fds[index], line, strlen(line))<0)
+        printf("\n[unable to perform file_put]\n");
     sem_post(&mutex[index]);
 
     return position;
@@ -101,7 +120,7 @@ int main()
     int n2=0;
     char prevkey[256]="24";
     char key[256]="24sadasdasdasdasdsad";
-    char value[256]="valueasdasdad";
+    char value[256]="value2";
     off_t offset;
     bzero(key+strlen(key),sizeof(key)-strlen(key));
     bzero(value+strlen(value),sizeof(value)-strlen(value));
@@ -114,7 +133,7 @@ int main()
     for(i=0;i<setSize;i++)
     {
         snprintf(fileName,sizeof(fileName),"File%d.txt",i);
-        fds[i]=open(fileName, O_CREAT|O_RDWR|O_APPEND,S_IRWXU);
+        fds[i]=open(fileName, O_CREAT|O_RDWR,S_IRWXU);
         if(fds[i]<0)
         {
             printf("\n[Unable to Open File%d.txt]\n",i);
@@ -125,10 +144,10 @@ int main()
     }
     
 
-    offset = file_put(prevkey, value);
+    offset = file_put(prevkey, "value1");
     offset = file_put(key, value);
-    file_get(0, prevkey, value);   // Doesnot depend on key arg, returns key and value at offset 0
+    file_get(9, prevkey, value);   // Doesnot depend on key arg, returns key and value at offset 0
     printf("%s\n", value);
-    file_del(0, prevkey);
+    file_del(offset, prevkey);
 
 }