TYBcs OS-Syspro Slip 21-2 | IProgramX

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void make_toks(char *s, char *tok[])
{
int i=0;
char *p;

p = strtok(s," ");
while(p!=NULL)
{
tok[i++]=p;
p=strtok(NULL," ");
}

tok[i]=NULL;
}

void count(char *fn, char op)
{
int fh,cc=0,wc=0,lc=0;
char c;

fh = open(fn,O_RDONLY);
if(fh==-1)
{
printf("File %s not found.\n",fn);
return;
}

while(read(fh,&c,1)>0)
{
if(c==' ') wc++;
else if(c=='\n')
{
wc++;
lc++;
}
cc++;
}

close(fh);

switch(op)
{
case 'c':
printf("No.of characters:%d\n",cc);
break;
case 'w':
printf("No.of words:%d\n",wc);
break;
case 'l':
printf("No.of lines:%d\n",lc);
break;
}
}

int main()
{
char buff[80],*args[10];
int pid;

while(1)
{
printf("myshell$");
fflush(stdin);
fgets(buff,80,stdin);
buff[strlen(buff)-1]='\0';
make_toks(buff,args);
if(strcmp(args[0],"count")==0)
count(args[2],args[1][0]);
else
{
pid = fork();
if(pid>0)
wait();
else
{
if(execvp(args[0],args)==-1)
printf("Bad command.\n");
}
}
}

return 0;
}