1 | /*****************************************************************************/ |
2 | /* */ |
3 | /* intptrstack.c */ |
4 | /* */ |
5 | /* Integer+ptr stack used for program settings */ |
6 | /* */ |
7 | /* */ |
8 | /* */ |
9 | /* (C) 2017, Mega Cat Studios */ |
10 | /* */ |
11 | /* */ |
12 | /* This software is provided 'as-is', without any expressed or implied */ |
13 | /* warranty. In no event will the authors be held liable for any damages */ |
14 | /* arising from the use of this software. */ |
15 | /* */ |
16 | /* Permission is granted to anyone to use this software for any purpose, */ |
17 | /* including commercial applications, and to alter it and redistribute it */ |
18 | /* freely, subject to the following restrictions: */ |
19 | /* */ |
20 | /* 1. The origin of this software must not be misrepresented; you must not */ |
21 | /* claim that you wrote the original software. If you use this software */ |
22 | /* in a product, an acknowledgment in the product documentation would be */ |
23 | /* appreciated but is not required. */ |
24 | /* 2. Altered source versions must be plainly marked as such, and must not */ |
25 | /* be misrepresented as being the original software. */ |
26 | /* 3. This notice may not be removed or altered from any source */ |
27 | /* distribution. */ |
28 | /* */ |
29 | /*****************************************************************************/ |
30 | |
31 | |
32 | |
33 | /* common */ |
34 | #include "check.h" |
35 | #include "intptrstack.h" |
36 | |
37 | |
38 | |
39 | /*****************************************************************************/ |
40 | /* Code */ |
41 | /*****************************************************************************/ |
42 | |
43 | |
44 | |
45 | void IPS_Get (const IntPtrStack* S, long *Val, void **Ptr) |
46 | /* Get the value on top of an int stack */ |
47 | { |
48 | PRECONDITION (S->Count > 0); |
49 | if (Val) *Val = S->Stack[S->Count-1].val; |
50 | if (Ptr) *Ptr = S->Stack[S->Count-1].ptr; |
51 | } |
52 | |
53 | |
54 | |
55 | void IPS_Set (IntPtrStack* S, long Val, void *Ptr) |
56 | /* Set the value on top of an int stack */ |
57 | { |
58 | PRECONDITION (S->Count > 0); |
59 | S->Stack[S->Count-1].val = Val; |
60 | S->Stack[S->Count-1].ptr = Ptr; |
61 | } |
62 | |
63 | |
64 | |
65 | void IPS_Drop (IntPtrStack* S) |
66 | /* Drop a value from an int stack */ |
67 | { |
68 | PRECONDITION (S->Count > 0); |
69 | --S->Count; |
70 | } |
71 | |
72 | |
73 | |
74 | void IPS_Push (IntPtrStack* S, long Val, void *Ptr) |
75 | /* Push a value onto an int stack */ |
76 | { |
77 | PRECONDITION (S->Count < sizeof (S->Stack) / sizeof (S->Stack[0])); |
78 | S->Stack[S->Count].val = Val; |
79 | S->Stack[S->Count++].ptr = Ptr; |
80 | } |
81 | |
82 | |
83 | |
84 | void IPS_Pop (IntPtrStack* S, long *Val, void **Ptr) |
85 | /* Pop a value from an int stack */ |
86 | { |
87 | PRECONDITION (S->Count > 0); |
88 | if (Val) *Val = S->Stack[--S->Count].val; |
89 | if (Ptr) *Ptr = S->Stack[S->Count].ptr; |
90 | } |
91 | |