blob: 1bd6d14bf67f9fa6cc29904b662d56d8b208dfc5 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
/* klaar@ida
A test program for the stack setup that do not rely on any (they
are not yet implemented!) system calls.
The intended pintos command line running from userprog is:
pintos -v -k --fs-disk=2 -p ../examples/sumargv -a sumargv -- -f -q run 'sumargv'
This invocation shall return 0. To return any other number, invoke
with numbers that sum to that number. 'sumargv 1000 200 4 30 will
result in 1234.
Note -v (no vga) and -q (poweroff when done) may cause trouble. If
you have problems exiting pintos, pres C-a and then x. If the
program does not seem to work it may be due to -q do poweroff too
fast (process_wait is incorrect).
*/
#include <stdlib.h>
int
main (int argc, char **argv)
{
int i;
int sum = 0;
char* argv_me = "sumargv";
char* p;
/* If we do not have a valid `argv', exit with error code 111. */
if (argv == 0)
return 111;
/* Weighted sum of characters in "sumargv". */
for (p = argv_me, i = 0; *p; ++p, ++i)
sum += (*p - 'a') * i;
/* Weighted sum of characters in `argv[0]'. */
for (p = argv[0], i = 0; *p; ++p, ++i)
sum -= (*p - 'a') * i;
/* The `sum' should now be zero if the program name `argv[0]' is
* correctly set up. */
/* Interpret all remaining command line words as numbers and sum them. */
for (i = 1; i < argc; i++)
sum += atoi(argv[i]);
/* If `argv' ends correctly with a null pointer this has no effect. */
sum += (int)argv[argc];
/* The final return value should now be the sum of the numbers
* specified after sumargv on the command line. */
return sum;
}
|
