BSD 4_3_Net_2 development

[unix-history] / usr / src / usr.bin / groff / psbb / psbb.c

/* 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;
}