BSD 4_3_Tahoe release

[unix-history] / usr / src / usr.bin / rev.c

diff --git a/usr/src/usr.bin/rev.c b/usr/src/usr.bin/rev.c
index 1ca9571..f358b0f 100644 (file)
--- a/usr/src/usr.bin/rev.c
+++ b/usr/src/usr.bin/rev.c
@@ -1,45 +1,53 @@
-static char *sccsid = "@(#)rev.c       4.1 (Berkeley) 10/1/80";
-#include <stdio.h>
+/*
+ * Copyright (c) 1987 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1987 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */

 
 

-/* reverse lines of a file */
+#ifndef lint
+static char sccsid[] = "@(#)rev.c      4.4 (Berkeley) 6/29/88";
+#endif /* not lint */

 
 

-#define N 256
-char line[N];
-FILE *input;
+#include <stdio.h>

 
 

-main(argc,argv)
-char **argv;
+main(argc, argv)
+       int argc;
+       char **argv;

 {
 {

-       register i,c;
-       input = stdin;
+       register char *t, *bp;
+       char buf[BUFSIZ];
+
+       bp = buf;

        do {
        do {

-               if(argc>1) {
-                       if((input=fopen(argv[1],"r"))==NULL) {
-                               fprintf(stderr,"rev: cannot open %s\n",
-                                       argv[1]);
-                               exit(1);
-                       }
+               if (argc > 1 && !freopen(*++argv, "r", stdin)) {
+                       fprintf(stderr, "rev: cannot open %s.\n", *argv);
+                       exit(1);

                }
                }

-               for(;;){
-                       for(i=0;i<N;i++) {
-                               line[i] = c = getc(input);
-                               switch(c) {
-                               case EOF:
-                                       goto eof;
-                               default:
-                                       continue;
-                               case '\n':
-                                       break;
-                               }
-                               break;
-                       }
-                       while(--i>=0)
-                               putc(line[i],stdout);
-                       putc('\n',stdout);
+               while (fgets(bp, sizeof(buf), stdin)) {
+                       for (t = bp; *t; ++t);
+                       if (*--t == '\n')
+                               --t;
+                       for (; t >= bp; --t)
+                               putchar(*t);
+                       putchar('\n');

                }
                }

-eof:
-               fclose(input);
-               argc--;
-               argv++;
-       } while(argc>1);
+       } while(--argc > 1);
+       exit(0);

 }
 }