root/gtags-cscope/history.c

/* */

DEFINITIONS

1. addcmd
2. prevcmd
3. nextcmd
4. resetcmd
5. currentcmd

   1 /*===========================================================================
   2  Copyright (c) 1998-2000, The Santa Cruz Operation 
   3  All rights reserved.
   4  
   5  Redistribution and use in source and binary forms, with or without
   6  modification, are permitted provided that the following conditions are met:
   7 
   8  *Redistributions of source code must retain the above copyright notice,
   9  this list of conditions and the following disclaimer.
  10 
  11  *Redistributions in binary form must reproduce the above copyright notice,
  12  this list of conditions and the following disclaimer in the documentation
  13  and/or other materials provided with the distribution.
  14 
  15  *Neither name of The Santa Cruz Operation nor the names of its contributors
  16  may be used to endorse or promote products derived from this software
  17  without specific prior written permission. 
  18 
  19  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
  20  IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
  23  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  INTERRUPTION)
  27  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  30  DAMAGE. 
  31  =========================================================================*/
  32 
  33 /** @file
  34  *      command history
  35  *
  36  *      cscope - interactive C symbol or text cross-reference
  37  */
  38 
  39 #include "global-cscope.h"
  40 
  41 #include "alloc.h"
  42 
  43 static char const rcsid[] = "$Id: history.c,v 1.2 2012/10/13 07:02:06 shigio Exp $";
  44 
  45 static  struct cmd *tail, *current;
  46 
  47 /**
  48  *      add a cmd to the history list
  49  *
  50  *      @param[in]      f       field number
  51  *      @param[in]      s       command text
  52  */
  53 void
  54 addcmd(int f, char *s)
  55 {
  56         struct cmd *h;
  57 
  58         h = mymalloc(sizeof(struct cmd));
  59         if( tail) {
  60                 tail->next = h;
  61                 h->next = 0;
  62                 h->prev = tail;
  63                 tail = h;
  64         } else {
  65                 tail = h;
  66                 h->next = h->prev = 0;
  67         }
  68         h->field = f;
  69         h->text = my_strdup( s);
  70         current = 0;
  71 }
  72 
  73 /** return previous history item */
  74 struct cmd *
  75 prevcmd(void)
  76 {
  77         if( current) {
  78                 if( current->prev)      /* stay on first item */
  79                         return current = current->prev;
  80                 else
  81                         return current;
  82         } else if( tail)
  83                 return current = tail;
  84         else 
  85                 return NULL;
  86 }
  87 
  88 /** return next history item */
  89 struct cmd *
  90 nextcmd(void)
  91 {
  92         if( current) {
  93                 if( current->next)      /* stay on first item */
  94                         return current = current->next;
  95                 else
  96                         return current;
  97         } else 
  98                 return NULL;
  99 }
 100 /** reset current to tail */
 101 void
 102 resetcmd(void)
 103 {
 104         current = 0;
 105 }
 106 
 107 struct cmd *
 108 currentcmd(void)
 109 {
 110         return current;
 111 }

/* */