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#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: hist.c 807 2007-11-09 01:21:33Z hubert@u.washington.edu $";
#endif
/*
* ========================================================================
* Copyright 2006-2007 University of Washington
* Copyright 2013 Eduardo Chappa
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*/
#include "../pith/headers.h"
#include "../pith/conf.h"
#include "../pith/hist.h"
void
init_hist(HISTORY_S **history, int histsize)
{
size_t l;
if(!history)
return;
if(!*history){
l = sizeof(**history) + histsize * sizeof(ONE_HIST_S);
*history = (HISTORY_S *) fs_get(l);
memset(*history, 0, l);
(*history)->histsize = histsize;
(*history)->origindex = histsize - 1;
add_to_histlist(history);
}
(*history)->curindex = (*history)->origindex;
}
void
free_hist(HISTORY_S **history)
{
int i;
if(history && *history){
for(i = 0; i < (*history)->histsize; i++)
if((*history)->hist[i] && (*history)->hist[i]->str)
fs_give((void **) &(*history)->hist[i]->str);
fs_give((void **) history);
}
}
char *
get_prev_hist(HISTORY_S *history, char *savethis, unsigned saveflags, void *cntxt)
{
int nextcurindex;
size_t l;
if(!(history && history->histsize > 0))
return NULL;
nextcurindex = (history->curindex + 1) % history->histsize;
/* already at start of history */
if(nextcurindex == history->origindex
|| !(history->hist[nextcurindex] && history->hist[nextcurindex]->str
&& history->hist[nextcurindex]->str[0]))
return NULL;
/* save what user typed */
if(history->curindex == history->origindex){
if(!savethis)
savethis = "";
if(!history->hist[history->origindex]){
history->hist[history->origindex] = (ONE_HIST_S *) fs_get(sizeof(ONE_HIST_S));
memset(history->hist[history->origindex], 0, sizeof(ONE_HIST_S));
}
if(history->hist[history->origindex]->str){
if(strlen(history->hist[history->origindex]->str) < (l=strlen(savethis)))
fs_resize((void **) &history->hist[history->origindex]->str, l+1);
strncpy(history->hist[history->origindex]->str, savethis, l+1);
history->hist[history->origindex]->str[l] = '\0';
}
else
history->hist[history->origindex]->str = cpystr(savethis);
history->hist[history->origindex]->flags = saveflags;
history->hist[history->origindex]->cntxt = cntxt;
}
history->curindex = nextcurindex;
return((history->hist[history->curindex] && history->hist[history->curindex]->str)
? history->hist[history->curindex]->str : NULL);
}
char *
get_next_hist(HISTORY_S *history, char *savethis, unsigned saveflags, void *cntxt)
{
if(!(history && history->histsize > 0))
return NULL;
/* already at end (most recent) of history */
if(history->curindex == history->origindex)
return NULL;
history->curindex = (history->curindex + history->histsize - 1) % history->histsize;
return((history->hist[history->curindex] && history->hist[history->curindex]->str)
? history->hist[history->curindex]->str : NULL);
}
void
save_hist(HISTORY_S *history, char *savethis, unsigned saveflags, void *cntxt)
{
size_t l;
int plusone;
if(!(history && history->histsize > 0))
return;
plusone = (history->origindex + 1) % history->histsize;
if(!history->hist[history->origindex]){
history->hist[history->origindex] = (ONE_HIST_S *) fs_get(sizeof(ONE_HIST_S));
memset(history->hist[history->origindex], 0, sizeof(ONE_HIST_S));
}
if(savethis && savethis[0]
&& (!history->hist[history->origindex]->str
|| strcmp(history->hist[history->origindex]->str, savethis)
|| history->hist[history->origindex]->flags != saveflags
|| history->hist[history->origindex]->cntxt != cntxt)
&& !(history->hist[plusone] && history->hist[plusone]->str
&& !strcmp(history->hist[plusone]->str, savethis)
&& history->hist[history->origindex]->flags == saveflags
&& history->hist[history->origindex]->cntxt == cntxt)){
if(history->hist[history->origindex]->str){
if(strlen(history->hist[history->origindex]->str) < (l=strlen(savethis)))
fs_resize((void **) &history->hist[history->origindex]->str, l+1);
strncpy(history->hist[history->origindex]->str, savethis, l+1);
history->hist[history->origindex]->str[l] = '\0';
}
else{
history->hist[history->origindex]->str = cpystr(savethis);
}
history->hist[history->origindex]->flags = saveflags;
history->hist[history->origindex]->cntxt = cntxt;
history->origindex = (history->origindex + history->histsize - 1) % history->histsize;
if(history->hist[history->origindex] && history->hist[history->origindex]->str)
history->hist[history->origindex]->str[0] = '\0';
}
}
/*
* Returns count of items entered into history.
*/
int
items_in_hist(HISTORY_S *history)
{
int i, cnt = 0;
if(history && history->histsize > 0)
for(i = 0; i < history->histsize; i++)
if(history->hist[i] && history->hist[i]->str)
cnt++;
return(cnt);
}
static HISTORY_S **histlist[100];
void
add_to_histlist(HISTORY_S **history)
{
int i;
if(history){
/* find empty slot */
for(i = 0; i < 100; i++)
if(!histlist[i])
break;
if(i < 100)
histlist[i] = history;
}
}
void
free_histlist(void)
{
int i;
for(i = 0; i < 100; i++)
if(histlist[i])
free_hist(histlist[i]);
}
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