cat: allow compiling out -n and -b

When these options were introduced in d88f94a5df3a2edb8ba56fab5c13674b452f87ab
it provides no config options to compile them out. Now provide one.

Introduce config FEATURE_CATN.

Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 38 insertions, 21 deletions

diff --git a/coreutils/cat.c b/coreutils/cat.c
index 4d9147f8a..178f96b09 100644
--- a/coreutils/cat.c
+++ b/coreutils/cat.c
@@ -13,6 +13,13 @@
 //config:         cat is used to concatenate files and print them to the standard
 //config:         output. Enable this option if you wish to enable the 'cat' utility.
 //config:
+//config:config FEATURE_CATN
+//config:       bool "Enable -n and -b options"
+//config:       default y
+//config:       depends on CAT
+//config:       help
+//config:         -n numbers all output lines while -b numbers nonempty output lines.
+//config:
 //config:config FEATURE_CATV
 //config:       bool "cat -v[etA]"
 //config:       default y
@@ -27,12 +34,19 @@
 /* BB_AUDIT SUSv3 compliant */
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */
 
+//usage:#if ENABLE_FEATURE_CATN || ENABLE_FEATURE_CATV
+//usage:#define cat_trivial_usage
+//usage:       "[-" IF_FEATURE_CATN("nb") IF_FEATURE_CATV("vteA") "] [FILE]..."
+//usage:#else
 //usage:#define cat_trivial_usage
-//usage:       "[-nb"IF_FEATURE_CATV("vteA")"] [FILE]..."
+//usage:       "[FILE]..."
+//usage:#endif
 //usage:#define cat_full_usage "\n\n"
 //usage:       "Print FILEs to stdout\n"
+//usage:        IF_FEATURE_CATN(
 //usage:     "\n        -n      Number output lines"
 //usage:     "\n        -b      Number nonempty lines"
+//usage:        )
 //usage:        IF_FEATURE_CATV(
 //usage:     "\n        -v      Show nonprinting characters as ^x or M-x"
 //usage:     "\n        -t      ...and tabs as ^I"
@@ -84,7 +98,7 @@
  * I agree with the argument. Unfortunately, this ship has sailed (1983...).
  * There are dozens of Linux distros and each of them has "cat" which supports -v.
  * It's unrealistic for us to "reeducate" them to use our, incompatible way
- * to achieve "cat -v" effect. The actuall effect would be "users pissed off
+ * to achieve "cat -v" effect. The actual effect would be "users pissed off
  * by gratuitous incompatibility".
  */
 #define CATV_OPT_e (1<<0)
@@ -147,7 +161,7 @@ int cat_main(int argc UNUSED_PARAM, char **argv)
 
         IF_FEATURE_CATV(opt_complementary = "Aetv"; /* -A == -vet */)
         /* -u is ignored ("unbuffered") */
-        opts = getopt32(argv, IF_FEATURE_CATV("etvA")"nbu");
+        opts = getopt32(argv, IF_FEATURE_CATV("etvA") IF_FEATURE_CATN("nb") "u");
         argv += optind;
 
 #if ENABLE_FEATURE_CATV
@@ -157,23 +171,26 @@ int cat_main(int argc UNUSED_PARAM, char **argv)
         opts >>= 4;
 #endif
 
-#define CAT_OPT_n (1<<0)
-#define CAT_OPT_b (1<<1)
-#define CAT_OPT_u (1<<2)
-        if (!(opts & (CAT_OPT_n|CAT_OPT_b))) /* no -n or -b */
-                return bb_cat(argv);
+#if ENABLE_FEATURE_CATN
+# define CAT_OPT_n (1<<0)
+# define CAT_OPT_b (1<<1)
+        if (opts & (CAT_OPT_n|CAT_OPT_b)) { /* -n or -b */
+                if (!*argv)
+                        *--argv = (char*)"-";
+                ns.width = 6;
+                ns.start = 1;
+                ns.inc = 1;
+                ns.sep = "\t";
+                ns.empty_str = "\n";
+                ns.all = !(opts & CAT_OPT_b); /* -n without -b */
+                ns.nonempty = (opts & CAT_OPT_b); /* -b (with or without -n) */
+                do {
+                        print_numbered_lines(&ns, *argv);
+                } while (*++argv);
+                fflush_stdout_and_exit(EXIT_SUCCESS);
+        }
+        /*opts >>= 2;*/
+#endif
 
-        if (!*argv)
-                *--argv = (char*)"-";
-        ns.width = 6;
-        ns.start = 1;
-        ns.inc = 1;
-        ns.sep = "\t";
-        ns.empty_str = "\n";
-        ns.all = !(opts & CAT_OPT_b); /* -n without -b */
-        ns.nonempty = (opts & CAT_OPT_b); /* -b (with or without -n) */
-        do {
-                print_numbered_lines(&ns, *argv);
-        } while (*++argv);
-        fflush_stdout_and_exit(EXIT_SUCCESS);
+        return bb_cat(argv);
 }