//************************************
//Includes
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
//************************************
//Globals
int packed;
//************************************
//Function Prototypes
int pack_value(int value, int size, int low_bit);
int unpack_value(int holder, int size, int low_bit);
void get_date(int holder, int day, int month, int year);
void get_permissions(int permission, int clas, int *read , int *write , int *execute);
int w_permission(int clas, int *read , int *write , int *execute);
int take_permissions(int clas,int *r, int *w, int *e);
//***********************************
//Main function
int main(int argc, char** argv)
{
//Variables
int d,m,y; //date variables
int r,w,e; //permission variables
int p1,p2,p3; //packed class variables
int i;
int permissions;
int day, month, year;
char a;
printf("DATE:\n");
//getting day and packing it
printf(" Day:");
scanf("%d",&day);
d = pack_value(day,31, 0); //31 = 5 one's on the lower bits
//getting month and packing it
printf(" Month:");
scanf("%d",&month);
m=pack_value(month,15, 5); //15 = 4 one's on the lower bits
//getting Year and packing it
printf(" Year:");
scanf("%d",&year);
y=pack_value(year,4095, 10); //4095 = 12 one's on the lower bits
//Packing date in one variable
packed = d|m|y;
//Taking permissins
printf("\n\nPermissions for Owner :\n");
p1=take_permissions(1,&r,&w,&e);
printf("\nPermissions for Group :");
p2=take_permissions(2,&r,&w,&e);
printf("\nPermissions for Others :");
p3=take_permissions(3,&r,&w,&e);
//packing permissions
permissions=p1|p2|p3;
//Unpacking date
get_date( packed, &d, &m, &y);
//Printing Date
printf("\n\nDATE\n day:%d\n month:%d\n year:%d\n", d, m, y);
//*****
//Unpacking permissins and printing them
for(i=1;i<=3;i++)
{
switch(i)
{
case 1:
printf("\nPermissions for Owner :");
get_permissions(permissions,i,&r,&w,&e);
if(r==1)
printf("read " );
if(w==1)
printf("Write " );
if(e==1)
printf("Execute " );
break;
case 2:
printf("\nPermissions for Group :");
get_permissions(permissions,i,&r,&w,&e);
if(r==1)
printf("read " );
if(w==1)
printf("Write " );
if(e==1)
printf("Execute " );
break;
case 3:
printf("\nPermissions for Others :");
get_permissions(permissions,i,&r,&w,&e);
if(r==1)
printf("read " );
if(w==1)
printf("Write " );
if(e==1)
printf("Execute " );
break;
}
}
//****
printf("\n");
return (EXIT_SUCCESS);
}
//***********************************
//Function to pack and shift value
int pack_value(int value, int size, int low_bit)
{
int bit_check;
bit_check= value & size;
if (bit_check == value)
{value= value << low_bit;
return value;}
else
printf("Bit Error!");
exit(1);
}
//***********************************
//Function Unpack value
int unpack_value(int holder, int size, int low_bit)
{
int unpack;
unpack= (holder>>low_bit)&size;
return unpack;
}
//***********************************
//Function to get date
void get_date(int holder, int *day, int *month, int *year)
{
//int packed_value= day|month|year;
*day= unpack_value(holder, 31, 0);
*month= unpack_value(holder, 15, 5);
*year= unpack_value(holder, 4095, 10);
//printf("DATE\n day:%d\n month:%d\n year:%d", day, month, year);
}
//***********************************
//Function unpack date
void get_permissions(int permission, int clas, int *read , int *write , int *execute)
{
//(Class*3) will determine how much the shift is needed
*read= unpack_value(permission, 1, (clas*3)-3);
*write= unpack_value(permission, 1, ((clas*3)-2));
*execute= unpack_value(permission, 1,((clas*3)-1));
}
//***********************************
//Function to write permissions
int w_permission(int clas, int *read , int *write , int *execute)
{
int p1,p2,p3,per=0;
p1 = pack_value(*read, 1, (clas*3)-3);
p2 = pack_value(*write, 1, ((clas*3)-2));
p3 = pack_value(*execute, 1,((clas*3)-1));
per =p1|p2|p3;
return per;
}
//***********************************
//Function to take permissions from user
int take_permissions(int clas,int *r, int *w, int *e)
{
int p1;
char a;
printf("\nread (y/n):");
a=getch();
if(a=='y')
{
*r=1;
}else *r=0;
printf("\nwrite (y/n):");
a=getch();
if(a=='y')
{
*w=1;
}else *w=0;
printf("\nexecute (y/n):");
a=getch();
if(a=='y')
{
*e=1;
}else *e=0;
p1=w_permission(clas,r,w,e);
return p1;
}
prog.c: In function ‘main’:
prog.c:106: warning: passing argument 2 of ‘get_date’ makes integer from pointer without a cast
prog.c:106: warning: passing argument 3 of ‘get_date’ makes integer from pointer without a cast
prog.c:106: warning: passing argument 4 of ‘get_date’ makes integer from pointer without a cast
prog.c:48: warning: unused variable ‘a’
prog.c:58: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:65: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:72: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c: At top level:
prog.c:231: error: conflicting types for ‘get_date’
prog.c:22: error: previous declaration of ‘get_date’ was here
prog.c: In function ‘take_permissions’:
prog.c:304: warning: implicit declaration of function ‘getch’
ali11 -1 Light Poster
Adak 419 Nearly a Posting Virtuoso
Your prototype for getdate is this:
void get_date(int holder, int day, int month, int year);
But the function itself, says:
void get_date(int holder, int *day, int *month, int *year);
Which has the compiler giving errors to you. Make your prototype the same as your function's first line, and you'll be seeing much fewer errors and warnings.
Note that getch() is in conio.h iirc. You could use getchar(), however. (Which returns an char, but it's an int really. Confusing, I know.
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