preparatory patch for -Wwrite-strings #3

init/init.c

@@ -326,27 +326,26 @@ static void console_init(void)
 			/* Force the TERM setting to vt102 for serial console --
 			 * if TERM is set to linux (the default) */
 			if (s == NULL || strcmp(s, "linux") == 0)
-				putenv("TERM=vt102");
+				putenv((char*)"TERM=vt102");
 #if !ENABLE_SYSLOGD
 			log_console = console;
 #endif
 		} else {
 			if (s == NULL)
-				putenv("TERM=linux");
+				putenv((char*)"TERM=linux");
 		}
 		close(fd);
 	}
 	messageD(LOG, "console=%s", console);
 }
 
-static void fixup_argv(int argc, char **argv, char *new_argv0)
+static void fixup_argv(int argc, char **argv, const char *new_argv0)
 {
 	int len;
 
 	/* Fix up argv[0] to be certain we claim to be init */
 	len = strlen(argv[0]);
-	memset(argv[0], 0, len);
-	safe_strncpy(argv[0], new_argv0, len + 1);
+	strncpy(argv[0], new_argv0, len);
 
 	/* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
 	len = 1;
@@ -381,7 +380,8 @@ static pid_t run(const struct init_action *a)
 {
 	int i;
 	pid_t pid;
-	char *s, *tmpCmd, *cmd[INIT_BUFFS_SIZE], *cmdpath;
+	char *s, *tmpCmd, *cmdpath;
+	char *cmd[INIT_BUFFS_SIZE];
 	char buf[INIT_BUFFS_SIZE + 6];	/* INIT_BUFFS_SIZE+strlen("exec ")+1 */
 	sigset_t nmask, omask;
 	static const char press_enter[] =
@@ -389,7 +389,7 @@ static pid_t run(const struct init_action *a)
 #include CUSTOMIZED_BANNER
 #endif
 		"\nPlease press Enter to activate this console. ";
-	char *prog;
+	const char *prog;
 
 	/* Block sigchild while forking.  */
 	sigemptyset(&nmask);
@@ -472,7 +472,7 @@ static pid_t run(const struct init_action *a)
 		/* See if any special /bin/sh requiring characters are present */
 		if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
 			cmd[0] = (char *)DEFAULT_SHELL;
-			cmd[1] = "-c";
+			cmd[1] = (char*)"-c";
 			cmd[2] = strcat(strcpy(buf, "exec "), a->command);
 			cmd[3] = NULL;
 		} else {

loginutils/adduser.c

@@ -169,7 +169,7 @@ int adduser_main(int argc, char **argv)
 		bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
 	}
 
-	pw.pw_gecos = "Linux User,,,";
+	pw.pw_gecos = (char *)"Linux User,,,";
 	pw.pw_shell = (char *)DEFAULT_SHELL;
 	pw.pw_dir = NULL;
 
@@ -185,7 +185,7 @@ int adduser_main(int argc, char **argv)
 
 	/* create a passwd struct */
 	pw.pw_name = argv[optind];
-	pw.pw_passwd = "x";
+	pw.pw_passwd = (char *)"x";
 	pw.pw_uid = 0;
 	pw.pw_gid = usegroup ? xgroup2gid(usegroup) : 0; /* exits on failure */
 

loginutils/getty.c

@@ -33,7 +33,7 @@
 #include <time.h>
 #if ENABLE_FEATURE_WTMP
 extern void updwtmp(const char *filename, const struct utmp *ut);
-static void update_utmp(char *line);
+static void update_utmp(const char *line);
 #endif
 #endif  /* LOGIN_PROCESS */
 
@@ -85,10 +85,10 @@ static void update_utmp(char *line);
 struct options {
 	int flags;                      /* toggle switches, see below */
 	unsigned timeout;               /* time-out period */
-	char *login;                    /* login program */
-	char *tty;                      /* name of tty */
-	char *initstring;               /* modem init string */
-	char *issue;                    /* alternative issue file */
+	const char *login;                    /* login program */
+	const char *tty;                      /* name of tty */
+	const char *initstring;               /* modem init string */
+	const char *issue;                    /* alternative issue file */
 	int numspeed;                   /* number of baud rates to try */
 	int speeds[MAX_SPEED];          /* baud rates to be tried */
 };
@@ -187,7 +187,7 @@ static void parse_args(int argc, char **argv, struct options *op)
 		const char *p = op->initstring;
 		char *q;
 
-		q = op->initstring = xstrdup(op->initstring);
+		op->initstring = q = xstrdup(op->initstring);
 		/* copy optarg into op->initstring decoding \ddd
 		   octal codes into chars */
 		while (*p) {
@@ -233,7 +233,7 @@ static void xdup2(int srcfd, int dstfd, const char *tty)
 }
 
 /* open_tty - set up tty as standard { input, output, error } */
-static void open_tty(char *tty, struct termios *tp, int local)
+static void open_tty(const char *tty, struct termios *tp, int local)
 {
 	int chdir_to_root = 0;
 
@@ -655,7 +655,7 @@ static void termios_final(struct options *op, struct termios *tp, struct chardat
 #ifdef SYSV_STYLE
 #if ENABLE_FEATURE_UTMP
 /* update_utmp - update our utmp entry */
-static void update_utmp(char *line)
+static void update_utmp(const char *line)
 {
 	struct utmp ut;
 	struct utmp *utp;

loginutils/passwd.c

@@ -53,7 +53,7 @@ static void crypt_make_salt(char *p, int cnt)
 static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
 {
 	char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
-	char *orig = "";
+	char *orig = (char*)"";
 	char *newp = NULL;
 	char *cipher = NULL;
 	char *cp = NULL;
@@ -241,7 +241,7 @@ int passwd_main(int argc, char **argv)
 		/*STATE_ALGO_des = 0x20, not needed yet */
 	};
 	unsigned opt;
-	char *opt_a = "";
+	const char *opt_a = "";
 	const char *filename;
 	char *myname;
 	char *name;

loginutils/su.c

@@ -14,9 +14,9 @@
 int su_main(int argc, char **argv)
 {
 	unsigned flags;
-	char *opt_shell = 0;
-	char *opt_command = 0;
-	char *opt_username = "root";
+	char *opt_shell = NULL;
+	char *opt_command = NULL;
+	const char *opt_username = "root";
 	struct passwd *pw;
 	uid_t cur_uid = getuid();
 	const char *tty;

miscutils/crontab.c

@@ -290,8 +290,7 @@ static void EditFile(const char *user, const char *file)
 		/*
 		 * CHILD - change user and run editor
 		 */
-		char *ptr;
-		char visual[1024];
+		const char *ptr;
 
 		if (ChangeUser(user, 1) < 0)
 			exit(0);
@@ -299,10 +298,9 @@ static void EditFile(const char *user, const char *file)
 		if (ptr == NULL || strlen(ptr) > 256)
 			ptr = PATH_VI;
 
-		snprintf(visual, sizeof(visual), "%s %s", ptr, file);
-		execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", visual, NULL);
-		perror("exec");
-		exit(0);
+		ptr = xasprintf("%s %s", ptr, file);
+		execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", ptr, NULL);
+		bb_perror_msg_and_die("exec");
 	}
 	if (pid < 0) {
 		/*

util-linux/fdisk.c

@@ -185,7 +185,7 @@ static void reread_partition_table(int leave);
 static void delete_partition(int i);
 static int get_partition(int warn, int max);
 static void list_types(const struct systypes *sys);
-static unsigned read_int(unsigned low, unsigned dflt, unsigned high, unsigned base, char *mesg);
+static unsigned read_int(unsigned low, unsigned dflt, unsigned high, unsigned base, const char *mesg);
 #endif
 static const char *partition_type(unsigned char type);
 static void fdisk_fatal(enum failure why) ATTRIBUTE_NORETURN;
@@ -1410,7 +1410,7 @@ get_boot(enum action what)
  * There is no default if DFLT is not between LOW and HIGH.
  */
 static unsigned
-read_int(unsigned low, unsigned dflt, unsigned high, unsigned base, char *mesg)
+read_int(unsigned low, unsigned dflt, unsigned high, unsigned base, const char *mesg)
 {
 	unsigned i;
 	int default_ok = 1;

util-linux/fdisk_osf.c

@@ -630,7 +630,7 @@ xbsd_create_disklabel(void)
 }
 
 static int
-edit_int(int def, char *mesg)
+edit_int(int def, const char *mesg)
 {
 	mesg = xasprintf("%s (%d): ", mesg, def);
 	do {
@@ -639,7 +639,7 @@ edit_int(int def, char *mesg)
 	} while (!isdigit(*line_ptr));
 	def = atoi(line_ptr);
  ret:
-	free(mesg);
+	free((char*)mesg);
 	return def;
 }
 
@@ -707,9 +707,9 @@ sync_disks(void)
 static void
 xbsd_write_bootstrap(void)
 {
-	char *bootdir = BSD_LINUX_BOOTDIR;
 	char path[MAXPATHLEN];
-	char *dkbasename;
+	const char *bootdir = BSD_LINUX_BOOTDIR;
+	const char *dkbasename;
 	struct xbsd_disklabel dl;
 	char *d, *p, *e;
 	int sector;

util-linux/ipcrm.c

@@ -152,8 +152,8 @@ int ipcrm_main(int argc, char **argv)
 				  (c == 'm') ? shmget(key, 0, 0) : semget(key, 0, 0));
 
 			if (id < 0) {
-				char *errmsg;
-				const char * const what = "key";
+				const char *errmsg;
+				const char *const what = "key";
 
 				error++;
 				switch (errno) {
@@ -183,8 +183,8 @@ int ipcrm_main(int argc, char **argv)
 				  semctl(id, 0, IPC_RMID, arg));
 
 		if (result) {
-			char *errmsg;
-			const char * const what = iskey ? "key" : "id";
+			const char *errmsg;
+			const char *const what = iskey ? "key" : "id";
 
 			error++;
 			switch (errno) {

util-linux/mount.c

@@ -64,7 +64,7 @@ enum {
  * flags */
 
 struct {
-	char *name;
+	const char *name;
 	long flags;
 } static mount_options[] = {
 	// MS_FLAGS set a bit.  ~MS_FLAGS disable that bit.  0 flags are NOPs.
@@ -122,7 +122,7 @@ struct {
 #define VECTOR_SIZE(v) (sizeof(v) / sizeof((v)[0]))
 
 /* Append mount options to string */
-static void append_mount_options(char **oldopts, char *newopts)
+static void append_mount_options(char **oldopts, const char *newopts)
 {
 	if (*oldopts && **oldopts) {
 		/* do not insert options which are already there */
@@ -303,7 +303,7 @@ static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
 		fsname = 0;
 		if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */
 			mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
-			mp->mnt_type = "bind";
+			mp->mnt_type = (char*)"bind";
 		}
 		mp->mnt_freq = mp->mnt_passno = 0;
 
@@ -1342,7 +1342,7 @@ prepare_kernel_data:
 
 do_mount: /* perform actual mount */
 
-	mp->mnt_type = "nfs";
+	mp->mnt_type = (char*)"nfs";
 	retval = mount_it_now(mp, vfsflags, (char*)&data);
 	goto ret;
 
@@ -1428,7 +1428,7 @@ static int singlemount(struct mntent *mp, int ignore_busy)
 		// lock is required
 		vfsflags |= MS_MANDLOCK;
 
-		mp->mnt_type = "cifs";
+		mp->mnt_type = (char*)"cifs";
 		rc = mount_it_now(mp, vfsflags, filteropts);
 		if (ENABLE_FEATURE_CLEAN_UP) free(mp->mnt_fsname);
 		goto report_error;