slip3_2.c

#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-1); 
 break; 
        case 'w':  
 printf("No.of words:%d\n",wc);  
 break;  
    case 'l':  
 printf("No.of lines:%d\n",lc+1);
  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;  
}
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