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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <mflib/exceptions.h>
#include <mfmod/mfmod.h>
/*
* echo
* ----
* If the argument is of type string or number, return it unchanged.
* Otherwise (mfmod_message), signal argument type error (e_inval).
*/
int
echo(long count, MFMOD_PARAM *p, MFMOD_PARAM *r)
{
ASSERT_ARGCOUNT(r, count, 1);
switch (p->type) {
case mfmod_string:
r->string = strdup(p->string);
assert(r->string != NULL);
break;
case mfmod_number:
r->number = p->number;
break;
default:
return mfmod_error_argtype(p, r, 0, mfmod_string);
}
r->type = p->type;
return 0;
}
/*
* argcheck
* --------
* Checks number and types of its argument and signals a corresponding
* exception if something's wrong. Apart from that does nothing useful.
*
* Arguments:
* p[0] string
* p[1] number
*/
int
argcheck(long count, MFMOD_PARAM *p, MFMOD_PARAM *r)
{
ASSERT_ARGCOUNT(r, count, 2);
ASSERT_ARGTYPE(p, r, 0, mfmod_string);
ASSERT_ARGTYPE(p, r, 1, mfmod_number);
r->type = mfmod_number;
return 0;
}
/*
* sum(...)
* --------
* Returns sum of its arguments. Intended for testing type checking in
* variadic functions.
*
* Arguments: Any number (zero allowed) of numeric values.
* Return: numeric value.
*/
int
sum(long count, MFMOD_PARAM *p, MFMOD_PARAM *r)
{
long i;
long sum = 0;
for (i = 0; i < count; i++) {
ASSERT_ARGTYPE(p, r, i, mfmod_number);
sum += p[i].number;
}
r->type = mfmod_number;
r->number = sum;
return 0;
}
|
