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/* catdvi - get text from DVI files
Copyright (C) 2001 Bjoern Brill <brill@fs.math.uni-frankfurt.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pageref.h"
#include "util.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
pageref_flavour_t pageref_parse(pageref_t * this, const char * pagespec)
{
char * tail, * colon;
pageref_t r = {0, 0, 0, PRF_INVALID};
sint32 * field;
colon = strchr(pagespec, ':');
if(pagespec[0] == '=' || pagespec[0] == '@') {
/* physical page */
++pagespec;
r.flavour = PRF_PHYSICAL;
field = &r.physical;
}
else if(colon != NULL) {
/* chapter:count0 */
if(pagespec[0] == ':') return PRF_INVALID;
r.chapter = strtol(pagespec, &tail, 10);
if(tail != colon) return PRF_INVALID;
pagespec = colon + 1;
r.flavour = PRF_COUNT0_CHAPTER;
field = &r.count0;
}
else {
/* count0 without chapter */
r.flavour = PRF_COUNT0;
field = &r.count0;
}
if(*pagespec == 0) return PRF_INVALID;
*field = strtol(pagespec, &tail, 10);
if(*tail != 0) return PRF_INVALID;
*this = r;
return r.flavour;
}
/* Return value like strcmp */
static int sint32_cmp(sint32 a, sint32 b)
{
if (a > b) return 1;
else if (a < b) return -1;
else return 0;
}
int pageref_count0_cmp(sint32 a, sint32 b)
{
if ((a < 0) && (b < 0)) return sint32_cmp(-a, -b);
else return sint32_cmp(a, b);
/* if only one of them is negative we get it right the usual way */
}
int pageref_cmp(const struct pageref_t * a, const struct pageref_t * b)
{
enum pageref_flavour_t fa, fb;
int r;
fa = a->flavour;
fb = b->flavour;
/* flavour PRF_COMPLETE is compatible with everything */
if (fa == PRF_COMPLETE) {
if (fb == PRF_COMPLETE) {
/* OK, we choose physical pages then */
fa = PRF_PHYSICAL;
fb = PRF_PHYSICAL;
}
else fa = fb;
}
else if (fb == PRF_COMPLETE) fb = fa;
if (fa != fb)
panic("pageref_cmp: incompatible page reference flavours\n");
switch(fa) {
case PRF_INVALID:
panic("pageref_cmp: invalid page reference\n");
break;
case PRF_PHYSICAL:
return sint32_cmp(a->physical, b->physical);
break;
case PRF_COUNT0:
return pageref_count0_cmp(a->count0, b->count0);
break;
case PRF_COUNT0_CHAPTER:
r = sint32_cmp(a->chapter, b->chapter);
if (r != 0) return r;
else return pageref_count0_cmp(a->count0, b->count0);
break;
default:
panic("pageref_cmp: unknown page reference flavour\n");
}
NOTREACHED;
return 0; /* get rid of pointless compiler warning */
}
void pageref_print(pageref_t * this, FILE * f)
{
switch(this->flavour) {
case PRF_INVALID:
fputs("INVALID\n", f);
break;
case PRF_PHYSICAL:
fprintf(
f,
"physical=%5ld\n",
this->physical
);
break;
case PRF_COUNT0:
fprintf(
f,
"count0=%5ld\n",
this->count0
);
break;
case PRF_COUNT0_CHAPTER:
fprintf(
f,
"count0=%5ld, chapter=%5ld\n",
this->count0,
this->chapter
);
break;
case PRF_COMPLETE:
fprintf(
f,
"physical=%5ld, count0=%5ld, chapter=%5ld\n",
this->physical,
this->count0,
this->chapter
);
break;
default:
fputs("UNKNOWN\n", f);
}
}
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