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- /* Copyright (C) 1989, 1990 Free Software Foundation, Inc.
- Written by James Clark (jjc@jclark.uucp)
-
- 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 1, 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 LICENSE. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include <stdio.h>
- #include <string.h>
-
- 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);
- }
- 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;
- }
-
-