handle lines larger than 256 chars

SCCS-vsn: usr.bin/rev/rev.c 4.3

diff --git a/usr/src/usr.bin/rev/rev.c b/usr/src/usr.bin/rev/rev.c
index c0deb03..ed8e52f 100644 (file)
--- a/usr/src/usr.bin/rev/rev.c
+++ b/usr/src/usr.bin/rev/rev.c
@@ -1,46 +1,48 @@
-static char *sccsid = "@(#)rev.c       4.2 (Berkeley) %G%";
-#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 this notice is preserved and that due credit is given
+ * to the University of California at 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'' without express or implied warranty.
+ */
+
+#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      4.3 (Berkeley) %G%";
+#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);
 }
        exit(0);
 }