pith/hist.c

   1 #if !defined(lint) && !defined(DOS)
   2 static char rcsid[] = "$Id: hist.c 807 2007-11-09 01:21:33Z hubert@u.washington.edu $";
   3 #endif
   4
   5 /*
   6  * ========================================================================
   7  * Copyright 2013-2021 Eduardo Chappa
   8  * Copyright 2006-2007 University of Washington
   9  *
  10  * Licensed under the Apache License, Version 2.0 (the "License");
  11  * you may not use this file except in compliance with the License.
  12  * You may obtain a copy of the License at
  13  *
  14  *     http://www.apache.org/licenses/LICENSE-2.0
  15  *
  16  * ========================================================================
  17  */
  18
  19
  20 #include "../pith/headers.h"
  21 #include "../pith/conf.h"
  22 #include "../pith/hist.h"
  23
  24
  25 void
  26 init_hist(HISTORY_S **history, int histsize)
  27 {
  28     size_t l;
  29
  30     if(!history)
  31       return;
  32
  33     if(!*history){
  34         l = sizeof(**history) + histsize * sizeof(ONE_HIST_S);
  35         *history = (HISTORY_S *) fs_get(l);
  36         memset(*history, 0, l);
  37         (*history)->histsize = histsize;
  38         (*history)->origindex = histsize - 1;
  39         add_to_histlist(history);
  40     }
  41
  42     (*history)->curindex = (*history)->origindex;
  43 }
  44
  45
  46 void
  47 free_hist(HISTORY_S **history)
  48 {
  49     int i;
  50
  51     if(history && *history){
  52         for(i = 0; i < (*history)->histsize; i++)
  53           if((*history)->hist[i]){
  54             if((*history)->hist[i]->str)
  55                fs_give((void **) &(*history)->hist[i]->str);
  56             (*history)->hist[i]->cntxt = NULL;  /* taken care of elsewhere */
  57             fs_give((void **) &(*history)->hist[i]);
  58           }
  59
  60         fs_give((void **) history);
  61     }
  62 }
  63
  64 char *
  65 hist_in_pos(int pos, char **list, int llen, HISTORY_S *hist, int n)
  66 {
  67   if(pos < 0 || pos > llen + n)
  68     return NULL;
  69
  70   if(pos < llen)
  71      return list[pos];
  72
  73   hist->curindex = (hist->origindex + n - pos + llen) % hist->histsize;
  74   return((hist->hist[hist->curindex] && hist->hist[hist->curindex]->str)
  75            ? hist->hist[hist->curindex]->str : NULL);
  76 }
  77
  78 char *
  79 get_prev_hist(HISTORY_S *history, char *savethis, unsigned saveflags, void *cntxt)
  80 {
  81     int nextcurindex;
  82     size_t l;
  83
  84     if(!(history && history->histsize > 0))
  85       return NULL;
  86
  87     nextcurindex = (history->curindex + 1) % history->histsize;
  88
  89     /* already at start of history */
  90     if(nextcurindex == history->origindex
  91        || !(history->hist[nextcurindex] && history->hist[nextcurindex]->str
  92             && history->hist[nextcurindex]->str[0]))
  93       return NULL;
  94
  95     /* save what user typed */
  96     if(history->curindex == history->origindex){
  97         if(!savethis)
  98           savethis = "";
  99
 100         if(!history->hist[history->origindex]){
 101             history->hist[history->origindex] = (ONE_HIST_S *) fs_get(sizeof(ONE_HIST_S));
 102             memset(history->hist[history->origindex], 0, sizeof(ONE_HIST_S));
 103         }
 104
 105         if(history->hist[history->origindex]->str){
 106             if(strlen(history->hist[history->origindex]->str) < (l=strlen(savethis)))
 107               fs_resize((void **) &history->hist[history->origindex]->str, l+1);
 108
 109             strncpy(history->hist[history->origindex]->str, savethis, l+1);
 110             history->hist[history->origindex]->str[l] = '\0';
 111         }
 112         else
 113           history->hist[history->origindex]->str = cpystr(savethis);
 114
 115         history->hist[history->origindex]->flags = saveflags;
 116
 117         history->hist[history->origindex]->cntxt = cntxt;
 118     }
 119
 120     history->curindex = nextcurindex;
 121
 122     return((history->hist[history->curindex] && history->hist[history->curindex]->str)
 123            ? history->hist[history->curindex]->str : NULL);
 124 }
 125
 126
 127 char *
 128 get_next_hist(HISTORY_S *history, char *savethis, unsigned saveflags, void *cntxt)
 129 {
 130     if(!(history && history->histsize > 0))
 131       return NULL;
 132
 133     /* already at end (most recent) of history */
 134     if(history->curindex == history->origindex)
 135       return NULL;
 136
 137     history->curindex = (history->curindex + history->histsize - 1) % history->histsize;
 138
 139     return((history->hist[history->curindex] && history->hist[history->curindex]->str)
 140            ? history->hist[history->curindex]->str : NULL);
 141 }
 142
 143
 144 void
 145 save_hist(HISTORY_S *history, char *savethis, unsigned saveflags, void *cntxt)
 146 {
 147     size_t l;
 148     int plusone;
 149
 150     if(!(history && history->histsize > 0))
 151       return;
 152
 153     plusone = (history->origindex + 1) % history->histsize;
 154
 155     if(!history->hist[history->origindex]){
 156         history->hist[history->origindex] = (ONE_HIST_S *) fs_get(sizeof(ONE_HIST_S));
 157         memset(history->hist[history->origindex], 0, sizeof(ONE_HIST_S));
 158     }
 159
 160     if(savethis && savethis[0]
 161        && (!history->hist[history->origindex]->str
 162            || strcmp(history->hist[history->origindex]->str, savethis)
 163            || history->hist[history->origindex]->flags != saveflags
 164            || history->hist[history->origindex]->cntxt != cntxt)
 165        && !(history->hist[plusone] && history->hist[plusone]->str
 166             && !strcmp(history->hist[plusone]->str, savethis)
 167             && history->hist[history->origindex]->flags == saveflags
 168             && history->hist[history->origindex]->cntxt == cntxt)){
 169         if(history->hist[history->origindex]->str){
 170             if(strlen(history->hist[history->origindex]->str) < (l=strlen(savethis)))
 171               fs_resize((void **) &history->hist[history->origindex]->str, l+1);
 172
 173             strncpy(history->hist[history->origindex]->str, savethis, l+1);
 174             history->hist[history->origindex]->str[l] = '\0';
 175         }
 176         else{
 177             history->hist[history->origindex]->str = cpystr(savethis);
 178         }
 179
 180         history->hist[history->origindex]->flags = saveflags;
 181         history->hist[history->origindex]->cntxt = cntxt;
 182
 183         history->origindex = (history->origindex + history->histsize - 1) % history->histsize;
 184         if(history->hist[history->origindex] && history->hist[history->origindex]->str)
 185           history->hist[history->origindex]->str[0] = '\0';
 186     }
 187 }
 188
 189
 190 /*
 191  * Returns count of items entered into history.
 192  */
 193 int
 194 items_in_hist(HISTORY_S *history)
 195 {
 196     int i, cnt = 0;
 197
 198     if(history && history->histsize > 0)
 199       for(i = 0; i < history->histsize; i++)
 200         if(history->hist[i] && history->hist[i]->str)
 201           cnt++;
 202
 203     return(cnt);
 204 }
 205
 206
 207 static HISTORY_S **histlist[100];
 208
 209 void
 210 add_to_histlist(HISTORY_S **history)
 211 {
 212     int i;
 213
 214     if(history){
 215         /* find empty slot */
 216         for(i = 0; i < 100; i++)
 217           if(!histlist[i])
 218             break;
 219
 220         if(i < 100)
 221           histlist[i] = history;
 222     }
 223 }
 224
 225
 226 void
 227 free_histlist(void)
 228 {
 229     int i;
 230
 231     for(i = 0; i < 100; i++)
 232       if(histlist[i])
 233         free_hist(histlist[i]);
 234 }