introduce LONE_CHAR (optimized strcmp with one-char string)

6 files changed, 26 insertions, 17 deletions

diff --git a/coreutils/Kbuild b/coreutils/Kbuild
index cfb508d81..55f19b4ca 100644
--- a/coreutils/Kbuild
+++ b/coreutils/Kbuild
@@ -10,6 +10,7 @@ lib-y:=
 lib-$(CONFIG_BASENAME)  += basename.o
 lib-$(CONFIG_CAL)       += cal.o
 lib-$(CONFIG_CAT)       += cat.o
+lib-$(CONFIG_LESS)      += cat.o # less uses it if stdout isn't a tty
 lib-$(CONFIG_CATV)      += catv.o
 lib-$(CONFIG_CHGRP)     += chgrp.o chown.o
 lib-$(CONFIG_CHMOD)     += chmod.o
@@ -28,6 +29,7 @@ lib-$(CONFIG_DIRNAME)   += dirname.o
 lib-$(CONFIG_DOS2UNIX)  += dos2unix.o
 lib-$(CONFIG_DU)        += du.o
 lib-$(CONFIG_ECHO)      += echo.o
+lib-$(CONFIG_ASH)       += echo.o # used by ash
 lib-$(CONFIG_ENV)       += env.o
 lib-$(CONFIG_EXPR)      += expr.o
 lib-$(CONFIG_FALSE)     += false.o
@@ -65,6 +67,7 @@ lib-$(CONFIG_SYNC)      += sync.o
 lib-$(CONFIG_TAIL)      += tail.o
 lib-$(CONFIG_TEE)       += tee.o
 lib-$(CONFIG_TEST)      += test.o
+lib-$(CONFIG_ASH)       += test.o # used by ash
 lib-$(CONFIG_TOUCH)     += touch.o
 lib-$(CONFIG_TR)        += tr.o
 lib-$(CONFIG_TRUE)      += true.o
diff --git a/coreutils/cat.c b/coreutils/cat.c
index a95980552..db4d33dc5 100644
--- a/coreutils/cat.c
+++ b/coreutils/cat.c
@@ -11,20 +11,12 @@
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */
 
 #include "busybox.h"
-#include <unistd.h>
 
-int cat_main(int argc, char **argv)
+int bb_cat(char **argv)
 {
         FILE *f;
         int retval = EXIT_SUCCESS;
 
-        getopt32(argc, argv, "u");
-
-        argv += optind;
-        if (!*argv) {
-                *--argv = "-";
-        }
-
         do {
                 f = fopen_or_warn_stdin(*argv);
                 if (f) {
@@ -39,3 +31,15 @@ int cat_main(int argc, char **argv)
 
         return retval;
 }
+
+int cat_main(int argc, char **argv)
+{
+        getopt32(argc, argv, "u");
+
+        argv += optind;
+        if (!*argv) {
+                *--argv = "-";
+        }
+
+        return bb_cat(argv);
+}
diff --git a/coreutils/diff.c b/coreutils/diff.c
index 887679a0a..a49d5195a 100644
--- a/coreutils/diff.c
+++ b/coreutils/diff.c
@@ -1079,7 +1079,7 @@ static char **get_dir(char *path)
 
                 dp = warn_opendir(path);
                 while ((ep = readdir(dp))) {
-                        if ((!strcmp(ep->d_name, "..")) || (!strcmp(ep->d_name, ".")))
+                        if (!strcmp(ep->d_name, "..") || LONE_CHAR(ep->d_name, '.'))
                                 continue;
                         add_to_dirlist(ep->d_name, NULL, NULL, 0);
                 }
diff --git a/coreutils/echo.c b/coreutils/echo.c
index 99063ae52..0c8eac3bc 100644
--- a/coreutils/echo.c
+++ b/coreutils/echo.c
@@ -29,7 +29,7 @@
 #include <stdlib.h>
 #include "busybox.h"
 
-int bb_echo(int ATTRIBUTE_UNUSED argc, char **argv)
+int bb_echo(char **argv)
 {
 #ifndef CONFIG_FEATURE_FANCY_ECHO
 #define eflag '\\'
@@ -114,7 +114,7 @@ just_echo:
 
 int echo_main(int argc, char** argv)
 {
-        (void)bb_echo(argc, argv);
+        (void)bb_echo(argv);
         fflush_stdout_and_exit(EXIT_SUCCESS);
 }
 
diff --git a/coreutils/expr.c b/coreutils/expr.c
index 191473446..51e553dc6 100644
--- a/coreutils/expr.c
+++ b/coreutils/expr.c
@@ -136,7 +136,7 @@ static int null(VALUE * v)
         if (v->type == integer)
                 return v->u.i == 0;
         else                            /* string: */
-                return v->u.s[0] == '\0' || strcmp(v->u.s, "0") == 0;
+                return v->u.s[0] == '\0' || LONE_CHAR(v->u.s, '0');
 }
 
 /* Coerce V to a string value (can't fail).  */
diff --git a/coreutils/test.c b/coreutils/test.c
index ebb4f9086..d3d760467 100644
--- a/coreutils/test.c
+++ b/coreutils/test.c
@@ -175,14 +175,16 @@ int bb_test(int argc, char **argv)
 {
         int res;
 
-        if (strcmp(argv[0], "[") == 0) {
-                if (strcmp(argv[--argc], "]")) {
+        if (LONE_CHAR(argv[0], '[')) {
+                --argc;
+                if (NOT_LONE_CHAR(argv[argc], ']')) {
                         bb_error_msg("missing ]");
                         return 2;
                 }
                 argv[argc] = NULL;
         } else if (strcmp(argv[0], "[[") == 0) {
-                if (strcmp(argv[--argc], "]]")) {
+                --argc;
+                if (strcmp(argv[argc], "]]")) {
                         bb_error_msg("missing ]]");
                         return 2;
                 }
@@ -578,6 +580,6 @@ static int is_a_group_member(gid_t gid)
 
 int test_main(int argc, char **argv)
 {
-        exit(bb_test(argc, argv));
+        return bb_test(argc, argv);
 }