remove nearly-duplicate PATHs in several places

function                                             old     new   delta
bb_PATH_root_path                                      -      35     +35
varunset                                              60      58      -2
arith                                               2042    2033      -9
bb_default_root_login_path                            30       -     -30
.rodata                                           128794  128762     -32
which_main                                           152     117     -35
defpathvar                                            40       -     -40
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 0/4 up/down: 35/-148)          Total: -113 bytes

debianutils/which.c

@@ -22,9 +22,11 @@ int which_main(int argc, char **argv)
 		bb_show_usage();
 	}
 
+/* We shouldn't do this. Ever. Not our business.
 	if (!getenv("PATH")) {
-		setenv("PATH", "/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin", 1);
+		putenv((char*)bb_PATH_root_path);
 	}
+*/
 
 	while (--argc > 0) {
 		argv++;

include/libbb.h

@@ -953,8 +953,9 @@ extern const char bb_dev_null[];
 extern const char bb_busybox_exec_path[];
 /* util-linux manpage says /sbin:/bin:/usr/sbin:/usr/bin,
  * but I want to save a few bytes here */
-extern const char bb_default_root_login_path[]; /* "/sbin:/usr/sbin:/bin:/usr/bin" */
+extern const char bb_PATH_root_path[]; /* "PATH=/sbin:/usr/sbin:/bin:/usr/bin" */
-#define bb_default_login_path (bb_default_root_login_path + sizeof("/sbin:/usr/sbin"))
+#define bb_default_root_path (bb_PATH_root_path + sizeof("PATH"))
+#define bb_default_path      (bb_PATH_root_path + sizeof("PATH=/sbin:/usr/sbin"))
 
 extern const int const_int_0;
 extern const int const_int_1;

init/init.c

@@ -24,10 +24,6 @@
 #define CONSOLE_NAME_SIZE 32
 #define MAXENV	16		/* Number of env. vars */
 
-#ifndef _PATH_STDPATH
-#define _PATH_STDPATH	"/usr/bin:/bin:/usr/sbin:/sbin"
-#endif
-
 #if ENABLE_FEATURE_INIT_COREDUMPS
 /*
  * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
@@ -112,7 +108,7 @@ enum {
 
 static const char * const environment[] = {
 	"HOME=/",
-	"PATH=" _PATH_STDPATH,
+	bb_PATH_root_path,
 	"SHELL=/bin/sh",
 	"USER=root",
 	NULL

libbb/messages.c

@@ -40,7 +40,7 @@ const char bb_busybox_exec_path[] = CONFIG_BUSYBOX_EXEC_PATH;
 const char bb_default_login_shell[] = LIBBB_DEFAULT_LOGIN_SHELL;
 /* util-linux manpage says /sbin:/bin:/usr/sbin:/usr/bin,
  * but I want to save a few bytes here. Check libbb.h before changing! */
-const char bb_default_root_login_path[] = "/sbin:/usr/sbin:/bin:/usr/bin";
+const char bb_PATH_root_path[] = "PATH=/sbin:/usr/sbin:/bin:/usr/bin";
 
 
 const int const_int_0;

libbb/setup_environment.c

@@ -56,7 +56,7 @@ void setup_environment(const char *shell, int loginshell, int changeenv, const s
 		xsetenv("SHELL",   shell);
 		xsetenv("USER",    pw->pw_name);
 		xsetenv("LOGNAME", pw->pw_name);
-		xsetenv("PATH",   (pw->pw_uid ? bb_default_login_path : bb_default_root_login_path));
+		xsetenv("PATH",   (pw->pw_uid ? bb_default_path : bb_default_root_path));
 	}
 	else if (changeenv) {
 		/* Set HOME, SHELL, and if not becoming a super-user,

shell/ash.c

@@ -1581,7 +1581,6 @@ static unsigned long rseed;
 # define VDYNAMIC       0
 #endif
 
-static const char defpathvar[] = "PATH=/usr/local/bin:/usr/bin:/sbin:/bin";
 #ifdef IFS_BROKEN
 static const char defifsvar[] = "IFS= \t\n";
 #define defifs (defifsvar + 4)
@@ -1674,7 +1673,7 @@ static struct var varinit[] = {
 	{ NULL, VSTRFIXED|VTEXTFIXED|VUNSET,    "MAIL\0",       changemail },
 	{ NULL, VSTRFIXED|VTEXTFIXED|VUNSET,    "MAILPATH\0",   changemail },
 #endif
-	{ NULL, VSTRFIXED|VTEXTFIXED,           defpathvar,     changepath },
+	{ NULL, VSTRFIXED|VTEXTFIXED,           bb_PATH_root_path, changepath },
 	{ NULL, VSTRFIXED|VTEXTFIXED,           "PS1=$ ",       NULL },
 	{ NULL, VSTRFIXED|VTEXTFIXED,           "PS2=> ",       NULL },
 	{ NULL, VSTRFIXED|VTEXTFIXED,           "PS4=+ ",       NULL },
@@ -1710,7 +1709,6 @@ static struct var varinit[] = {
 #else
 #define vrandom (&vps4)[1]
 #endif
-#define defpath (defpathvar + 5)
 
 /*
  * The following macros access the values of the above variables.
@@ -7874,7 +7872,7 @@ parse_command_args(char **argv, const char **path)
 		do {
 			switch (c) {
 			case 'p':
-				*path = defpath;
+				*path = bb_default_path;
 				break;
 			default:
 				/* run 'typecmd' for other options */

shell/msh.c

@@ -5213,9 +5213,9 @@ int msh_main(int argc, char **argv)
 	if (path->value == null) {
 		/* Can be merged with same string elsewhere in bbox */
 		if (geteuid() == 0)
-			setval(path, bb_default_root_login_path);
+			setval(path, bb_default_root_path);
 		else
-			setval(path, bb_default_login_path);
+			setval(path, bb_default_path);
 	}
 	export(path);