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 | |
49 | const 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 | |
58 | void 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 | |
68 | void 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 | |
77 | void 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 | |