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f5dbf5d2 C |
1 | /* Copyright (C) 1989, 1990 Free Software Foundation, Inc. |
2 | Written by James Clark (jjc@jclark.uucp) | |
3 | ||
4 | This file is part of groff. | |
5 | ||
6 | groff is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 1, or (at your option) any later | |
9 | version. | |
10 | ||
11 | groff is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License along | |
17 | with groff; see the file LICENSE. If not, write to the Free Software | |
18 | Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <stdio.h> | |
21 | #include <string.h> | |
22 | ||
23 | struct bounding_box { | |
24 | int llx, lly, urx, ury; | |
25 | }; | |
26 | ||
27 | #ifdef __STDC__ | |
28 | const char *do_file(FILE *, struct bounding_box *); | |
29 | int parse_bounding_box(char *, struct bounding_box *); | |
30 | #else | |
31 | #define const /* as nothing */ | |
32 | const char *do_file(); | |
33 | int parse_bounding_box(); | |
34 | #endif | |
35 | ||
36 | int main(argc, argv) | |
37 | int argc; | |
38 | char **argv; | |
39 | { | |
40 | FILE *fp; | |
41 | const char *message; | |
42 | struct bounding_box bb; | |
43 | if (argc != 2) { | |
44 | fprintf(stderr, "usage: %s filename\n", argv[0]); | |
45 | exit(3); | |
46 | } | |
47 | fp = fopen(argv[1], "r"); | |
48 | if (fp == NULL) { | |
49 | fprintf(stderr, "%s: can't open `%s': ", argv[0], argv[1]); | |
50 | perror((char *)NULL); | |
51 | exit(2); | |
52 | } | |
53 | message = do_file(fp, &bb); | |
54 | if (message) { | |
55 | fprintf(stderr, "%s: ", argv[0]); | |
56 | fprintf(stderr, message, argv[1]); | |
57 | putc('\n', stderr); | |
58 | exit(1); | |
59 | } | |
60 | printf("%d %d %d %d\n", bb.llx, bb.lly, bb.urx, bb.ury); | |
61 | exit(0); | |
62 | } | |
63 | ||
64 | /* If the bounding box was found return NULL, and store the bounding box | |
65 | in bb. If the bounding box was not found return a string suitable for | |
66 | giving to printf with the filename as an argument saying why not. */ | |
67 | ||
68 | const char *do_file(fp, bb) | |
69 | FILE *fp; | |
70 | struct bounding_box *bb; | |
71 | { | |
72 | int bb_at_end = 0; | |
73 | char buf[256]; | |
74 | if (!fgets(buf, sizeof(buf), fp)) | |
75 | return "%s is empty"; | |
76 | if (strncmp("%!PS-Adobe-", buf, 11) != 0) | |
77 | return "%s is not conforming"; | |
78 | while (fgets(buf, sizeof(buf), fp) != 0) { | |
79 | if (buf[0] != '%' || buf[1] != '%' | |
80 | || strncmp(buf + 2, "EndComments", 11) == 0) | |
81 | break; | |
82 | if (strncmp(buf + 2, "BoundingBox:", 12) == 0) { | |
83 | int res = parse_bounding_box(buf + 14, bb); | |
84 | if (res == 1) | |
85 | return NULL; | |
86 | else if (res == 2) { | |
87 | bb_at_end = 1; | |
88 | break; | |
89 | } | |
90 | else | |
91 | return "the arguments to the %%%%BoundingBox comment in %s are bad"; | |
92 | } | |
93 | } | |
94 | if (bb_at_end) { | |
95 | long offset; | |
96 | int last_try = 0; | |
97 | /* in the trailer, the last BoundingBox comment is significant */ | |
98 | for (offset = 512; !last_try; offset *= 2) { | |
99 | int had_trailer = 0; | |
100 | int got_bb = 0; | |
101 | if (offset > 32768 || fseek(fp, -offset, 2) == -1) { | |
102 | last_try = 1; | |
103 | if (fseek(fp, 0L, 0) == -1) | |
104 | break; | |
105 | } | |
106 | while (fgets(buf, sizeof(buf), fp) != 0) { | |
107 | if (buf[0] == '%' && buf[1] == '%') { | |
108 | if (!had_trailer) { | |
109 | if (strncmp(buf + 2, "Trailer", 7) == 0) | |
110 | had_trailer = 1; | |
111 | } | |
112 | else { | |
113 | if (strncmp(buf + 2, "BoundingBox:", 12) == 0) { | |
114 | int res = parse_bounding_box(buf + 14, bb); | |
115 | if (res == 1) | |
116 | got_bb = 1; | |
117 | else if (res == 2) | |
118 | return "`(atend)' not allowed in trailer"; | |
119 | else | |
120 | return "the arguments to the %%%%BoundingBox comment in %s are bad"; | |
121 | } | |
122 | } | |
123 | } | |
124 | } | |
125 | if (got_bb) | |
126 | return NULL; | |
127 | } | |
128 | } | |
129 | return "%%%%BoundingBox comment not found in %s"; | |
130 | } | |
131 | ||
132 | /* Parse the argument to a %%BoundingBox comment. Return 1 if it | |
133 | contains 4 numbers, 2 if it contains (atend), 0 otherwise. */ | |
134 | ||
135 | int parse_bounding_box(p, bb) | |
136 | char *p; | |
137 | struct bounding_box *bb; | |
138 | { | |
139 | if (sscanf(p, "%d %d %d %d", | |
140 | &bb->llx, &bb->lly, &bb->urx, &bb->ury) == 4) | |
141 | return 1; | |
142 | else { | |
143 | /* The Document Structuring Conventions say that the numbers | |
144 | should be integers. Unfortunately some broken applications | |
145 | get this wrong. */ | |
146 | double x1, x2, x3, x4; | |
147 | if (sscanf(p, "%lf %lf %lf %lf", &x1, &x2, &x3, &x4) == 4) { | |
148 | bb->llx = (int)x1; | |
149 | bb->lly = (int)x2; | |
150 | bb->urx = (int)x3; | |
151 | bb->ury = (int)x4; | |
152 | return 1; | |
153 | } | |
154 | else { | |
155 | for (; *p == ' ' || *p == '\t'; p++) | |
156 | ; | |
157 | if (strncmp(p, "(atend)", 7) == 0) { | |
158 | return 2; | |
159 | } | |
160 | } | |
161 | } | |
162 | return 0; | |
163 | } | |
164 |