git.sur5r.net Git - cc65/blob - src/common/intstack.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                intstack.c                                 */
   4 /*                                                                           */
   5 /*                  Integer stack used for program settings                  */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2004-2010, 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 /* common */
  37 #include "check.h"
  38 #include "intstack.h"
  39
  40
  41
  42 /*****************************************************************************/
  43 /*                                   Code                                    */
  44 /*****************************************************************************/
  45
  46
  47
  48 long IS_Get (const IntStack* S)
  49 /* Get the value on top of an int stack */
  50 {
  51     PRECONDITION (S->Count > 0);
  52     return S->Stack[S->Count-1];
  53 }
  54
  55
  56
  57 void IS_Set (IntStack* S, long Val)
  58 /* Set the value on top of an int stack */
  59 {
  60     PRECONDITION (S->Count > 0);
  61     S->Stack[S->Count-1] = Val;
  62 }
  63
  64
  65
  66 void IS_Drop (IntStack* S)
  67 /* Drop a value from an int stack */
  68 {
  69     PRECONDITION (S->Count > 0);
  70     --S->Count;
  71 }
  72
  73
  74
  75 void IS_Push (IntStack* S, long Val)
  76 /* Push a value onto an int stack */
  77 {
  78     PRECONDITION (S->Count < sizeof (S->Stack) / sizeof (S->Stack[0]));
  79     S->Stack[S->Count++] = Val;
  80 }
  81
  82
  83
  84 long IS_Pop (IntStack* S)
  85 /* Pop a value from an int stack */
  86 {
  87     PRECONDITION (S->Count > 0);
  88     return S->Stack[--S->Count];
  89 }