1/*****************************************************************************/
2/* */
3/* intstack.c */
4/* */
5/* Integer stack used for program settings */
6/* */
7/* */
8/* */
9/* (C) 2004-2010, Ullrich von Bassewitz */
10/* Roemerstrasse 52 */
11/* D-70794 Filderstadt */
12/* EMail: uz@cc65.org */
13/* */
14/* */
15/* This software is provided 'as-is', without any expressed or implied */
16/* warranty. In no event will the authors be held liable for any damages */
17/* arising from the use of this software. */
18/* */
19/* Permission is granted to anyone to use this software for any purpose, */
20/* including commercial applications, and to alter it and redistribute it */
21/* freely, subject to the following restrictions: */
22/* */
23/* 1. The origin of this software must not be misrepresented; you must not */
24/* claim that you wrote the original software. If you use this software */
25/* in a product, an acknowledgment in the product documentation would be */
26/* appreciated but is not required. */
27/* 2. Altered source versions must be plainly marked as such, and must not */
28/* be misrepresented as being the original software. */
29/* 3. This notice may not be removed or altered from any source */
30/* distribution. */
31/* */
32/*****************************************************************************/
33
34
35
36/* common */
37#include "check.h"
38#include "intstack.h"
39
40
41
42/*****************************************************************************/
43/* Code */
44/*****************************************************************************/
45
46
47
48long IS_Get (const IntStack* S)
49/* Get the value on top of an int stack */
50{
51 PRECONDITION (S->Count > 0);
52 return S->Stack[S->Count-1];
53}
54
55
56
57void IS_Set (IntStack* S, long Val)
58/* Set the value on top of an int stack */
59{
60 PRECONDITION (S->Count > 0);
61 S->Stack[S->Count-1] = Val;
62}
63
64
65
66void IS_Drop (IntStack* S)
67/* Drop a value from an int stack */
68{
69 PRECONDITION (S->Count > 0);
70 --S->Count;
71}
72
73
74
75void IS_Push (IntStack* S, long Val)
76/* Push a value onto an int stack */
77{
78 PRECONDITION (S->Count < sizeof (S->Stack) / sizeof (S->Stack[0]));
79 S->Stack[S->Count++] = Val;
80}
81
82
83
84long IS_Pop (IntStack* S)
85/* Pop a value from an int stack */
86{
87 PRECONDITION (S->Count > 0);
88 return S->Stack[--S->Count];
89}
90