git.sur5r.net Git - cc65/blob - src/cc65/asmlabel.c

   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
  54 unsigned 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
  71 const 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
  84 int 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 }