1/*****************************************************************************/
2/* */
3/* strstack.c */
4/* */
5/* String stack used for program settings */
6/* */
7/* */
8/* */
9/* (C) 2004 Ullrich von Bassewitz */
10/* Römerstraße 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 "strstack.h"
39#include "xmalloc.h"
40
41
42
43/*****************************************************************************/
44/* Code */
45/*****************************************************************************/
46
47
48
49const char* SS_Get (const StrStack* S)
50/* Get the value on top of a string stack */
51{
52 CHECK (S->Count > 0);
53 return S->Stack[S->Count-1];
54}
55
56
57
58void SS_Set (StrStack* S, const char* Val)
59/* Set the value on top of a string stack */
60{
61 CHECK (S->Count > 0);
62 xfree (S->Stack[S->Count-1]);
63 S->Stack[S->Count-1] = xstrdup (Val);
64}
65
66
67
68void SS_Drop (StrStack* S)
69/* Drop a value from a string stack */
70{
71 CHECK (S->Count > 1);
72 xfree (S->Stack[--S->Count]);
73}
74
75
76
77void SS_Push (StrStack* S, const char* Val)
78/* Push a value onto a string stack */
79{
80 CHECK (S->Count < sizeof (S->Stack) / sizeof (S->Stack[0]));
81 S->Stack[S->Count++] = xstrdup (Val);
82}
83