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/* ppagelist.c */
/************************************************************************
Part of the dvipng distribution
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program. If not, see
<http://www.gnu.org/licenses/>.
Copyright (C) 2002-2008 Jan-Åke Larsson
************************************************************************/
#include "dvipng.h"
/* Some code at the end of this file is adapted from dvips */
static int32_t first=PAGE_FIRSTPAGE, last=PAGE_LASTPAGE;
static bool abspage=false, reverse=false;
bool no_ppage=true;
/* dvips' behaviour:
* -pp outputs _all_ pages with the correct numbers,
* -p, -l outputs from the first occurrence of firstpage to the first
* occurrence of lastpage. Using '=' means absolute pagenumbers
*/
void FirstPage(int32_t page, bool data)
{
first=page;
abspage |= data;
}
void LastPage(int32_t page,bool data)
{
last=page;
abspage |= data;
}
void Reverse(bool new)
{
reverse=new;
}
/*-->NextPPage*/
/**********************************************************************/
/**************************** NextPPage *****************************/
/**********************************************************************/
/* Return the page in turn on our queue */
/* (Implicitly, PAGE_POST is never in the pagelist) */
bool InPageList(int32_t i);
struct page_list* NextPPage(void* dvi, struct page_list* page)
{
if (! reverse) { /*********** normal order */
if (page == NULL) { /* first call: find first page */
if (no_ppage)
return(NULL);
page=FindPage(dvi,first,abspage);
} else /* later calls: count up, except "last" page */
page=(last==page->count[abspage ? 0 : 10]) ? NULL : NextPage(dvi,page);
/* seek for pages in pagelist */
while (page!=NULL && ! InPageList(page->count[0]))
page=(last==page->count[abspage ? 0 : 10]) ? NULL : NextPage(dvi,page);
} else { /******************** reverse order */
if (page == NULL) { /* first call: find "last" page */
if (no_ppage)
return(NULL);
page=FindPage(dvi,last,abspage);
} else /* later calls: count down, except "first" page */
page=(first==page->count[abspage ? 0 : 10]) ? NULL : PrevPage(dvi,page);
/* seek for pages in pagelist */
while (page!=NULL && ! InPageList(page->count[0]))
page=(first==page->count[abspage ? 0 : 10]) ? NULL : PrevPage(dvi,page);
}
return(page);
}
struct pp_list {
struct pp_list *next; /* next in a series of alternates */
int32_t ps_low, ps_high; /* allowed range */
} *ppages = 0; /* the list of allowed pages */
/*-->InPageList*/
/**********************************************************************/
/****************************** InPageList **************************/
/**********************************************************************/
/* Return true iff i is one of the desired output pages */
bool InPageList(int32_t i)
{
register struct pp_list *pl = ppages;
while (pl) {
if ( i >= pl -> ps_low && i <= pl -> ps_high)
return(true); /* success */
pl = pl -> next;
}
return(false);
}
void ListPage(int32_t pslow, int32_t pshigh)
{
register struct pp_list *pl;
/* Some added code, we want to reuse the list */
no_ppage=false;
pl = ppages;
while (pl != NULL && pl->ps_low <= pl->ps_high)
pl = pl->next;
if (pl == NULL) {
if ((pl = (struct pp_list *)malloc(sizeof(struct pp_list)))
==NULL)
Fatal("cannot allocate memory for page queue");
pl -> next = ppages;
ppages = pl;
}
pl -> ps_low = pslow;
pl -> ps_high = pshigh;
}
/* Parse a string representing a list of pages. Return 0 iff ok. As a
side effect, the page selection(s) is (are) prepended to ppages. */
bool ParsePages(char *s)
{
char *c; /* conversion start */
long int ps_low = PAGE_MINPAGE, ps_high = PAGE_MAXPAGE;
while (*s==' ' || *s=='\t') s++;
while (*s!='\0') {
if (*s=='-' || *s==':') { /* range with no starting value */
ps_low = PAGE_MINPAGE;
c=s+1;
ps_high = strtol(c,&s,10);
if (c==s) ps_high=PAGE_MAXPAGE; /* no number */
while (*s==' ' || *s=='\t') s++;
if (*s=='-' || *s==':') { /* Oh, range with negative starting value */
ps_low = -ps_high;
c=s+1;
ps_high = strtol(c,&s,10);
if (c==s) ps_high=PAGE_MAXPAGE; /* no number */
}
} else { /* range with starting value, or singleton */
c=s;
ps_low = ps_high = strtol(c,&s,10);
if (c==s)
return(true);
if (*s=='-' || *s==':') { /* range */
c=s+1;
ps_high = strtol(c,&s,10);
if (c==s) ps_high=PAGE_MAXPAGE; /* no number */
}
}
ListPage(ps_low, ps_high);
while (*s==' ' || *s=='\t' || *s==',') s++;
}
return(false);
}
/* Addition, we want to be able to clear the pplist */
void ClearPpList(void)
{
register struct pp_list *pl = ppages;
while (pl) {
ppages=ppages->next;
free(pl);
pl = ppages;
}
first=PAGE_FIRSTPAGE;
last=PAGE_LASTPAGE;
abspage = false;
no_ppage=true;
}
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