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
|
/*
* find_cusp.c
*
* This function provides the following utility for use within the kernel.
*
* Cusp *find_cusp(Triangulation *manifold, int cusp_index);
*
* The UI refers to cusps by their indices, because it doesn't know about
* the Cusp data structure. When a kernel function receives a cusp_index,
* it may call the function find_cusp() to convert the index to an actual
* pointer to the corresponding Cusp data structure. If find_cusp() cannot
* find a Cusp with the given cusp_index, it calls uFatalError().
*/
#include "kernel.h"
Cusp *find_cusp(
Triangulation *manifold,
int cusp_index)
{
Cusp *cusp;
for (cusp = manifold->cusp_list_begin.next;
cusp != &manifold->cusp_list_end;
cusp = cusp->next)
if (cusp->index == cusp_index)
return cusp;
/*
* No Cusp with the given index was found.
*/
uFatalError("find_cusp", "find_cusp");
/*
* The C++ compiler would like a return value, even though
* we never return from the uFatalError() call.
*/
return NULL;
}
|
