to analyse the assignment of pointer and output the potential call
output format：
${line} : ${func_name1}, ${func_name2}
${line} is unique in output.
Given the test file:
1 #include <stdio.h>
2
3 int add(int a, int b) {
4 return a+b;
5 }
6
7 int sub(int a, int b) {
8 return a-b;
9 }
10
11 int foo(int a, int b, int (*a_fptr)(int, int)) {
12 return a_fptr(a, b);
13 }
14
15
16 int main() {
17 int (*a_fptr)(int, int) = add;
18 int (*s_fptr)(int, int) = sub;
19 int (*t_fptr)(int, int) = 0;
20
21 char x;
22 int op1, op2;
23 fprintf(stderr, "Please input num1 +/- num2 \n");
24
25 fscanf(stdin, "%d %c %d", &op1, &x, &op2);
26
27 if (x == '+') {
28 t_fptr = a_fptr;
29 }
30
31 if (x == '-') {
32 t_fptr = s_fptr;
33 }
34
35 if (t_fptr != NULL) {
36 unsigned result = foo(op1, op2, t_fptr);
37 fprintf (stderr, "Result is %d \n", result);
38 } else {
39 fprintf (stderr, "Unrecoganised operation %c", x);
40 }
41 return 0;
42 }
The output should be :
12 : add, sub
23 : fprintf
25 : fscanf
36 : foo
37 : fprintf
39 : fprintf
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