git.sur5r.net Git - cc65/blob - src/ca65/toknode.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 toknode.c                                 */
   4 /*                                                                           */
   5 /*                Token list node for the ca65 macroassembler                */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 1998     Ullrich von Bassewitz                                        */
  10 /*              Wacholderweg 14                                              */
  11 /*              D-70597 Stuttgart                                            */
  12 /* EMail:       uz@musoftware.de                                             */
  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 <string.h>
  37
  38 #include "mem.h"
  39 #include "scanner.h"
  40 #include "toknode.h"
  41
  42
  43
  44 /*****************************************************************************/
  45 /*                                   Code                                    */
  46 /*****************************************************************************/
  47
  48
  49
  50 TokNode* NewTokNode (void)
  51 /* Create and return a token node with the current token value */
  52 {
  53     TokNode* T;
  54
  55     /* Allocate memory */
  56     unsigned Len = TokHasSVal (Tok)? strlen (SVal) : 0;
  57     T = Xmalloc (sizeof (TokNode) + Len);
  58
  59     /* Initialize the token contents */
  60     T->Next     = 0;
  61     T->Tok      = Tok;
  62     T->WS       = WS;
  63     T->IVal     = IVal;
  64     memcpy (T->SVal, SVal, Len);
  65     T->SVal [Len] = '\0';
  66
  67     /* Return the node */
  68     return T;
  69 }
  70
  71
  72
  73 void FreeTokNode (TokNode* T)
  74 /* Free the given token node */
  75 {
  76     Xfree (T);
  77 }
  78
  79
  80
  81 void TokSet (TokNode* T)
  82 /* Set the scanner token from the given token node */
  83 {
  84     /* Set the values */
  85     Tok  = T->Tok;
  86     WS   = T->WS;
  87     IVal = T->IVal;
  88     strcpy (SVal, T->SVal);
  89 }
  90
  91
  92
  93 enum TC TokCmp (const TokNode* T)
  94 /* Compare the token given as parameter against the current token */
  95 {
  96     if (T->Tok != Tok) {
  97         /* Different token */
  98         return tcDifferent;
  99     }
 100
 101     /* If the token has string attribute, check it */
 102     if (TokHasSVal (T->Tok)) {
 103         if (strcmp  (T->SVal, SVal) != 0) {
 104             return tcSameToken;
 105         }
 106     } else if (TokHasIVal (T->Tok)) {
 107         if (T->IVal != IVal) {
 108             return tcSameToken;
 109         }
 110     }
 111
 112     /* Tokens are identical */
 113     return tcIdentical;
 114 }
 115
 116
 117