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utility.c
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utility.c
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#include "utility.h"
#include<assert.h>
extern inode *root;
extern inode * currdirectory;
extern filetable FileTable[5];
extern superblock sfssuperblock;
extern int currentshellpid;
//myshell uttility functions
void printSupportedCommands()
{
printf("\n");
printf("Commands supported :\n");//write all the supported commands and its brief usage
printf("ls :list the current directory\n");
printf("\tUsage : ls <dirname>\n");
printf("cd :change the current directory\n");
printf("\tUsage : cd <dirname>\n");
printf("rmdir :delete a directory in the current directory\n");
printf("\tUsage : rmdir <dirname>\n");
printf("rm :delete a file in the current directory\n");
printf("\tUsage : rm <filename>\n");
printf("lseek :reset the currentfilepointer of the process opening a particular file \n");
printf("\tUsage : lseek <filename> <offset>\n");
printf("touch :create a file in the current directory\n");
printf("\tUsage : touch <filename>\n");
printf("cat :read a particular file in the current directory\n");
printf("\tUsage : cat <filename>\n");
printf("write :write into a particular file in the current directory\n");
printf("\tUsage : write <filename> and then enter the content\n");
printf("read :read nbytes from a particular file in the current directory\n");
printf("\tUsage : read <filename> <nbytes>\n");
printf("close :close the file which was opened by the current terminal's process\n");
printf("\tUsage : close <filename>\n");
printf("showfiletable :show contents of the filetable\n");
printf("\tUsage : showfiletable\n");
printf("showsuperblock :show the current status of the superblock\n");
printf("\tUsage : showsuperblock\n");
printf("\n\n");
}
char ** split(char * input,int noofwords)
{
char **result=(char **)malloc(sizeof(char *)*noofwords);
char *token = strtok(input," ");
int i=0;
while (token != NULL)
{
result[i]=token;
i++;
token = strtok(NULL, " ");
}
if(token==NULL)
{
return result;
}
}
char * getCommandFromInput(char * input)
{
int i=0;
int endpoint=0;
int inputlen=strlen(input);
for(i=0;i<inputlen;i++)
{
if(*(input+i)==' '||*(input +i)=='\n')
{
endpoint=i-1;
break;
}
}
char *command=(char *)(malloc(sizeof(char)*(endpoint+1)));
strncpy(command,input,endpoint+1);
return command;
}
char * getOtherPartFromInput(char * input)
{
int i=0;
int endpoint=0;
int inputlen=strlen(input);
for(i=0;i<inputlen;i++)
{
if(*(input+i)==' ')
{
endpoint=i+1;
break;
}
}
char *command=(char *)(malloc(sizeof(char)*(inputlen-endpoint)));
for(i=endpoint;i<inputlen;i++)
{
*(command+(i-endpoint))=*(input+i);
}
return command;
}
//filesystem utility functions
inode * getInodeFromCurrDirectory(char *name,char *type)
{
for(int i=0;i<5;i++)
{
if(strcmp(sfssuperblock.inodes[currdirectory->inodeList[i]].name,name)==0 && strcmp(sfssuperblock.inodes[currdirectory->inodeList[i]].type,type)==0)
{
return &sfssuperblock.inodes[currdirectory->inodeList[i]];
}
}
return NULL;
}
//filetable utility functions
void showFileTableContents()
{
printf("\n----------Showing all the filetable entries----------\n");
for(int i=0;i<5;i++)
{
if(FileTable[i].used==1)
{
printf("\t-->filedescriptor:%d\tprocess_id:%d\tcurrfilepointer:%d\n",FileTable[i].filedescriptor,FileTable[i].who,FileTable[i].currfilepointer);
}
}
printf("-------------------------------------------------------\n");
}
//inode utility functions
int getSizeOfFile(inode * file)
{
int noOfDatablocks = file->noOfDatablocks;
int size=0;
for(int i=0;i<noOfDatablocks;i++)
{
size+=sfssuperblock.datablocks[file->datablocksarray[i]].currsize;
}
return size;
}
//datablock utility functions
//superblock utility functions
void showSuperBlockStatus()
{
printf("\n----------------Showing superblock status------------\n");
int free_inodes=sfssuperblock.no_of_free_inodes;
int free_datablocks=sfssuperblock.no_of_free_datablocks;
printf("no of free inodes : %d\n",free_inodes);
printf("no of free datablocks : %d\n",free_datablocks);
printf("bitmap of inodes pool\n");
for(int i=0;i<TOTAL_INODES;i++)
{
printf("%d ",sfssuperblock.inodelist[i]);
}
printf("\nbitmap of datablocks pool\n");
for(int i=0;i<TOTAL_DATABLOCKS;i++)
{
printf("%d ",sfssuperblock.datablocklist[i]);
}
printf("\n-------------------------------------------------------\n");
}
//automount utility functions
//dumpfs utility functions