text-utils/rev.c

   1 /*-
   2  * Copyright (c) 1987, 1992 The Regents of the University of California.
   3  * 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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * Modified for Linux by Charles Hannum (mycroft@gnu.ai.mit.edu)
  34  *                   and Brian Koehmstedt (bpk@gnu.ai.mit.edu)
  35  *
  36  * Wed Sep 14 22:26:00 1994: Patch from bjdouma <bjdouma@xs4all.nl> to handle
  37  *                           last line that has no newline correctly.
  38  */
  39
  40 #ifndef lint
  41 char copyright[] =
  42 "@(#) Copyright (c) 1987, 1992 The Regents of the University of California.\n\
  43  All rights reserved.\n";
  44 #endif /* not lint */
  45
  46 #ifndef lint
  47 /*static char sccsid[] = "from: @(#)rev.c       5.2 (Berkeley) 3/21/92";*/
  48 static char rcsid[] = "$Id: rev.c,v 1.4 1996/07/02 20:08:07 janl Exp $";
  49 #endif /* not lint */
  50
  51 #include <sys/types.h>
  52 #include <errno.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #ifdef __linux__
  57 #include <unistd.h>
  58 #endif /* linux */
  59
  60 void usage __P((void));
  61 void warn __P((const char *, ...));
  62
  63 int
  64 main(argc, argv)
  65         int argc;
  66         char *argv[];
  67 {
  68         register char *filename, *t;
  69 #ifdef __linux__
  70         char p[512];
  71 #else /* linux */
  72         char *p;
  73 #endif /* linux */
  74         FILE *fp;
  75         size_t len;
  76         int ch, rval;
  77
  78         while ((ch = getopt(argc, argv, "")) != EOF)
  79                 switch(ch) {
  80                 case '?':
  81                 default:
  82                         usage();
  83                 }
  84
  85         argc -= optind;
  86         argv += optind;
  87
  88         fp = stdin;
  89         filename = "stdin";
  90         rval = 0;
  91         do {
  92                 if (*argv) {
  93                         if ((fp = fopen(*argv, "r")) == NULL) {
  94                                 warn("%s: %s", *argv, strerror(errno));
  95                                 rval = 1;
  96                                 ++argv;
  97                                 continue;
  98                         }
  99                         filename = *argv++;
 100                 }
 101 #ifndef __linux__
 102                 while (p = fgetline(fp, &len)) {
 103                         t = p + len - 1;
 104                         for (t = p + len - 1; t >= p; --t)
 105                                 putchar(*t);
 106                 }
 107 #else /* linux */
 108                 while (fgets(p, 511, fp)) {
 109                         len = strlen(p);
 110                         t = p + len - 1 - (*(p+len-1)=='\r'
 111                                            || *(p+len-1)=='\n');
 112                         for ( ; t >= p; --t)
 113                                 if(strcmp(t, "\0") != 0)
 114                                   putchar(*t);
 115 #endif /* linux */
 116                         putchar('\n');
 117                 }
 118                 if (ferror(fp)) {
 119                         warn("%s: %s", filename, strerror(errno));
 120                         rval = 1;
 121                 }
 122                 (void)fclose(fp);
 123         } while(*argv);
 124         exit(rval);
 125 }
 126
 127 #if __STDC__
 128 #include <stdarg.h>
 129 #else
 130 #include <varargs.h>
 131 #endif
 132
 133 void
 134 #if __STDC__
 135 warn(const char *fmt, ...)
 136 #else
 137 warn(fmt, va_alist)
 138         char *fmt;
 139         va_dcl
 140 #endif
 141 {
 142         va_list ap;
 143 #if __STDC__
 144         va_start(ap, fmt);
 145 #else
 146         va_start(ap);
 147 #endif
 148         (void)fprintf(stderr, "rev: ");
 149         (void)vfprintf(stderr, fmt, ap);
 150         va_end(ap);
 151         (void)fprintf(stderr, "\n");
 152 }
 153
 154 void
 155 usage()
 156 {
 157         (void)fprintf(stderr, "usage: rev [file ...]\n");
 158         exit(1);
 159 }