1/*****************************************************************************/
2/* */
3/* asmlabel.c */
4/* */
5/* Generate assembler code labels */
6/* */
7/* */
8/* */
9/* (C) 2000-2009 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#include <stdio.h>
37#include <string.h>
38
39/* common */
40#include "chartype.h"
41
42/* cc65 */
43#include "asmlabel.h"
44#include "error.h"
45
46
47
48/*****************************************************************************/
49/* Code */
50/*****************************************************************************/
51
52
53
54unsigned GetLocalLabel (void)
55/* Get an unused label. Will never return zero. */
56{
57 /* Number to generate unique labels */
58 static unsigned NextLabel = 0;
59
60 /* Check for an overflow */
61 if (NextLabel >= 0xFFFF) {
62 Internal ("Local label overflow");
63 }
64
65 /* Return the next label */
66 return ++NextLabel;
67}
68
69
70
71const char* LocalLabelName (unsigned L)
72/* Make a label name from the given label number. The label name will be
73** created in static storage and overwritten when calling the function
74** again.
75*/
76{
77 static char Buf[64];
78 sprintf (Buf, "L%04X", L);
79 return Buf;
80}
81
82
83
84int IsLocalLabelName (const char* Name)
85/* Return true if Name is the name of a local label */
86{
87 unsigned I;
88
89 if (Name[0] != 'L' || strlen (Name) != 5) {
90 return 0;
91 }
92 for (I = 1; I <= 4; ++I) {
93 if (!IsXDigit (Name[I])) {
94 return 0;
95 }
96 }
97
98 /* Local label name */
99 return 1;
100}
101