add "make help"

[oweals/busybox.git] / coreutils / uniq.c

diff --git a/coreutils/uniq.c b/coreutils/uniq.c
index d5c6f719d3c8644c175a036916fdf6a47f6642f4..93ae169f4a85b46c2806ea1ed95ffe3151a79fe7 100644 (file)
--- a/coreutils/uniq.c
+++ b/coreutils/uniq.c
@@ -2,7 +2,7 @@
 /*
  * uniq implementation for busybox
  *
- * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ * Copyright (C) 2005  Manuel Novoa III  <mjn3@codepoet.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -31,41 +31,39 @@
 #include "busybox.h"
 #include "libcoreutils/coreutils.h"
 
-static const char uniq_opts[] = "f:s:cdu\0\7\3\5\1\2\4";
+static const char uniq_opts[] = "f:s:" "cdu\0\1\2\4";
 
-static FILE *xgetoptfile_sort_uniq_s(char **argv, const char *mode)
+static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
 {
        const char *n;
 
        if ((n = *argv) != NULL) {
                if ((*n != '-') || n[1]) {
-                       return bb_xfopen(n, mode);
+                       return bb_xfopen(n, "r\0w" + read0write2);
                }
        }
-       return (*mode == 'r') ? stdin : stdout;
+       return (read0write2) ? stdout : stdin;
 }
 
 int uniq_main(int argc, char **argv)
 {
        FILE *in, *out;
-       /* Note: Ignore the warning about dups and e0 being used uninitialized.
-        * They will be initialized on the fist pass of the loop (since s0 is NULL). */
-#warning The dups and e0 warnings are OK, ignore them
-       unsigned long dups, skip_fields, skip_chars, i;
+       unsigned long dups, skip_fields, skip_chars, i, uniq_flags;
        const char *s0, *e0, *s1, *e1, *input_filename;
        int opt;
-       int uniq_flags = 6;             /* -u */
 
-       skip_fields = skip_chars = 0;
+       uniq_flags = skip_fields = skip_chars = 0;
 
        while ((opt = getopt(argc, argv, uniq_opts)) > 0) {
-               if (opt == 'f') {
-                       skip_fields = bb_xgetularg10(optarg);
-               } else if (opt == 's') {
-                       skip_chars = bb_xgetularg10(optarg);
+               if ((opt == 'f') || (opt == 's')) {
+                       int t = bb_xgetularg10(optarg);
+                       if (opt == 'f') {
+                               skip_fields = t;
+                       } else {
+                               skip_chars = t;
+                       }
                } else if ((s0 = strchr(uniq_opts, opt)) != NULL) {
-                       uniq_flags &= s0[4];
-                       uniq_flags |= s0[7];
+                       uniq_flags |= s0[4];
                } else {
                        bb_show_usage();
                }
@@ -73,51 +71,50 @@ int uniq_main(int argc, char **argv)
 
        input_filename = *(argv += optind);
 
-       in = xgetoptfile_sort_uniq_s(argv, "r");
+       in = xgetoptfile_uniq_s(argv, 0);
        if (*argv) {
                ++argv;
        }
-       out = xgetoptfile_sort_uniq_s(argv, "w");
+       out = xgetoptfile_uniq_s(argv, 2);
        if (*argv && argv[1]) {
                bb_show_usage();
        }
 
-       s0 = NULL;
+       s1 = e1 = NULL;                         /* prime the pump */
+
+       do {
+               s0 = s1;
+               e0 = e1;
+               dups = 0;
 
-       /* gnu uniq ignores newlines */
-       while ((s1 = bb_get_chomped_line_from_file(in)) != NULL) {
-               e1 = s1;
-               for (i=skip_fields ; i ; i--) {
-                       e1 = bb_skip_whitespace(e1);
-                       while (*e1 && !isspace(*e1)) {
+               /* gnu uniq ignores newlines */
+               while ((s1 = bb_get_chomped_line_from_file(in)) != NULL) {
+                       e1 = s1;
+                       for (i=skip_fields ; i ; i--) {
+                               e1 = bb_skip_whitespace(e1);
+                               while (*e1 && !isspace(*e1)) {
+                                       ++e1;
+                               }
+                       }
+                       for (i = skip_chars ; *e1 && i ; i--) {
                                ++e1;
                        }
+
+                       if (!s0 || strcmp(e0, e1)) {
+                               break;
+                       }
+
+                       ++dups;          /* Note: Testing for overflow seems excessive. */
                }
-               for (i = skip_chars ; *e1 && i ; i--) {
-                       ++e1;
-               }
+
                if (s0) {
-                       if (strcmp(e0, e1) == 0) {
-                               ++dups;         /* Note: Testing for overflow seems excessive. */
-                               continue;
-                       }
-               DO_LAST:
-                       if ((dups && (uniq_flags & 2)) || (!dups && (uniq_flags & 4))) {
-                               bb_fprintf(out, "\0%7d\t" + (uniq_flags & 1), dups + 1);
+                       if (!(uniq_flags & (2 << !!dups))) {
+                               bb_fprintf(out, "\0%d " + (uniq_flags & 1), dups + 1);
                                bb_fprintf(out, "%s\n", s0);
                        }
                        free((void *)s0);
                }
-
-               s0 = s1;
-               e0 = e1;
-               dups = 0;
-       }
-
-       if (s0) {
-               e1 = NULL;
-               goto DO_LAST;
-       }
+       } while (s1);
 
        bb_xferror(in, input_filename);