usr.bin/soelim/soelim.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)soelim.c 8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/soelim/soelim.c,v 1.3.2.2 2001/07/30 10:16:46 dd Exp $
  32  * $DragonFly: src/usr.bin/soelim/soelim.c,v 1.5 2004/09/30 10:08:46 joerg Exp $
  33  */
  34
  35 #include <err.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 /*
  40  * soelim - a filter to process n/troff input eliminating .so's
  41  *
  42  * Author: Bill Joy UCB July 8, 1977
  43  *
  44  * This program eliminates .so's from a n/troff input stream.
  45  * It can be used to prepare safe input for submission to the
  46  * phototypesetter since the software supporting the operator
  47  * doesn't let him do chdir.
  48  *
  49  * This is a kludge and the operator should be given the
  50  * ability to do chdir.
  51  *
  52  * This program is more generally useful, it turns out, because
  53  * the program tbl doesn't understand ".so" directives.
  54  */
  55
  56 #define STDIN_NAME      "-"
  57
  58 static int      process(const char *);
  59
  60 int
  61 main(int argc, const char **argv)
  62 {
  63         int errs = 0;
  64
  65         if (argc == 1) {
  66                 argv[0] = STDIN_NAME;
  67         } else {
  68                 argv++;
  69                 argc--;
  70         }
  71
  72         while (--argc >= 0) {
  73                 errs += process(argv[0]);
  74                 argv++;
  75         }
  76         exit(errs != 0);
  77 }
  78
  79 static int
  80 process(const char *file)
  81 {
  82         char *cp;
  83         int c;
  84         char fname[BUFSIZ];
  85         FILE *soee;
  86         int isfile;
  87
  88         if (!strcmp(file, STDIN_NAME)) {
  89                 soee = stdin;
  90         } else {
  91                 soee = fopen(file, "r");
  92                 if (soee == NULL) {
  93                         warn("%s", file);
  94                         return(-1);
  95                 }
  96         }
  97         for (;;) {
  98                 c = getc(soee);
  99                 if (c == EOF)
 100                         break;
 101                 if (c != '.')
 102                         goto simple;
 103                 c = getc(soee);
 104                 if (c != 's') {
 105                         putchar('.');
 106                         goto simple;
 107                 }
 108                 c = getc(soee);
 109                 if (c != 'o') {
 110                         printf(".s");
 111                         goto simple;
 112                 }
 113                 do
 114                         c = getc(soee);
 115                 while (c == ' ' || c == '\t');
 116                 cp = fname;
 117                 isfile = 0;
 118                 for (;;) {
 119                         switch (c) {
 120
 121                         case ' ':
 122                         case '\t':
 123                         case '\n':
 124                         case EOF:
 125                                 goto donename;
 126
 127                         default:
 128                                 *cp++ = c;
 129                                 c = getc(soee);
 130                                 isfile++;
 131                                 continue;
 132                         }
 133                 }
 134 donename:
 135                 if (cp == fname) {
 136                         printf(".so");
 137                         goto simple;
 138                 }
 139                 *cp = 0;
 140                 if (process(fname) < 0)
 141                         if (isfile)
 142                                 printf(".so %s\n", fname);
 143                 continue;
 144 simple:
 145                 if (c == EOF)
 146                         break;
 147                 putchar(c);
 148                 if (c != '\n') {
 149                         c = getc(soee);
 150                         goto simple;
 151                 }
 152         }
 153         if (soee != stdin) {
 154                 fclose(soee);
 155         }
 156         return(0);
 157 }