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

   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 }