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/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff 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, or (at your option) any later
version.
groff 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 groff; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <stdio.h>
#include <string.h>
#include <errno.h>
#ifndef errno
extern int errno;
#endif
struct bounding_box {
int llx, lly, urx, ury;
};
#ifdef __STDC__
const char *do_file(FILE *, struct bounding_box *);
int parse_bounding_box(char *, struct bounding_box *);
#else
#define const /* as nothing */
const char *do_file();
int parse_bounding_box();
#endif
int main(argc, argv)
int argc;
char **argv;
{
FILE *fp;
const char *message;
struct bounding_box bb;
if (argc != 2) {
fprintf(stderr, "usage: %s filename\n", argv[0]);
exit(3);
}
errno = 0;
fp = fopen(argv[1], "r");
if (fp == NULL) {
fprintf(stderr, "%s: can't open `%s': ", argv[0], argv[1]);
perror((char *)NULL);
exit(2);
}
message = do_file(fp, &bb);
if (message) {
fprintf(stderr, "%s: ", argv[0]);
fprintf(stderr, message, argv[1]);
putc('\n', stderr);
exit(1);
}
printf("%d %d %d %d\n", bb.llx, bb.lly, bb.urx, bb.ury);
exit(0);
}
/* If the bounding box was found return NULL, and store the bounding box
in bb. If the bounding box was not found return a string suitable for
giving to printf with the filename as an argument saying why not. */
const char *do_file(fp, bb)
FILE *fp;
struct bounding_box *bb;
{
int bb_at_end = 0;
char buf[256];
if (!fgets(buf, sizeof(buf), fp))
return "%s is empty";
if (strncmp("%!PS-Adobe-", buf, 11) != 0)
return "%s is not conforming";
while (fgets(buf, sizeof(buf), fp) != 0) {
if (buf[0] != '%' || buf[1] != '%'
|| strncmp(buf + 2, "EndComments", 11) == 0)
break;
if (strncmp(buf + 2, "BoundingBox:", 12) == 0) {
int res = parse_bounding_box(buf + 14, bb);
if (res == 1)
return NULL;
else if (res == 2) {
bb_at_end = 1;
break;
}
else
return "the arguments to the %%%%BoundingBox comment in %s are bad";
}
}
if (bb_at_end) {
long offset;
int last_try = 0;
/* in the trailer, the last BoundingBox comment is significant */
for (offset = 512; !last_try; offset *= 2) {
int had_trailer = 0;
int got_bb = 0;
if (offset > 32768 || fseek(fp, -offset, 2) == -1) {
last_try = 1;
if (fseek(fp, 0L, 0) == -1)
break;
}
while (fgets(buf, sizeof(buf), fp) != 0) {
if (buf[0] == '%' && buf[1] == '%') {
if (!had_trailer) {
if (strncmp(buf + 2, "Trailer", 7) == 0)
had_trailer = 1;
}
else {
if (strncmp(buf + 2, "BoundingBox:", 12) == 0) {
int res = parse_bounding_box(buf + 14, bb);
if (res == 1)
got_bb = 1;
else if (res == 2)
return "`(atend)' not allowed in trailer";
else
return "the arguments to the %%%%BoundingBox comment in %s are bad";
}
}
}
}
if (got_bb)
return NULL;
}
}
return "%%%%BoundingBox comment not found in %s";
}
/* Parse the argument to a %%BoundingBox comment. Return 1 if it
contains 4 numbers, 2 if it contains (atend), 0 otherwise. */
int parse_bounding_box(p, bb)
char *p;
struct bounding_box *bb;
{
if (sscanf(p, "%d %d %d %d",
&bb->llx, &bb->lly, &bb->urx, &bb->ury) == 4)
return 1;
else {
/* The Document Structuring Conventions say that the numbers
should be integers. Unfortunately some broken applications
get this wrong. */
double x1, x2, x3, x4;
if (sscanf(p, "%lf %lf %lf %lf", &x1, &x2, &x3, &x4) == 4) {
bb->llx = (int)x1;
bb->lly = (int)x2;
bb->urx = (int)x3;
bb->ury = (int)x4;
return 1;
}
else {
for (; *p == ' ' || *p == '\t'; p++)
;
if (strncmp(p, "(atend)", 7) == 0) {
return 2;
}
}
}
return 0;
}
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