Let lpr build with -Wmissing-variable-declarations.

Mark variables static where possible and place the uid/euid variables in
lp.h, so that we can compile-time enforce that these variables have the
same type.

usr.sbin/lpr/common_source/common.c

@@ -70,8 +70,6 @@ __FBSDID("$FreeBSD$");
 char	line[BUFSIZ];
 const char	*progname;		/* program name */
 
-extern uid_t	uid, euid;
-
 static int compar(const void *_p1, const void *_p2);
 
 /*

usr.sbin/lpr/common_source/displayq.c

@@ -75,8 +75,6 @@ __FBSDID("$FreeBSD$");
 /*
  * Stuff for handling job specifications
  */
-extern uid_t	uid, euid;
-
 static int	col;		/* column on screen */
 static char	current[MAXNAMLEN+1];	/* current file being printed */
 static char	file[MAXNAMLEN+1];	/* print file name */

usr.sbin/lpr/common_source/lp.h

@@ -252,6 +252,9 @@ typedef enum { TR_SENDING, TR_RECVING, TR_PRINTING } tr_sendrecv;
 /*
  * seteuid() macros.
 */
+
+extern uid_t	uid, euid;
+
 #define PRIV_START { \
     if (seteuid(euid) != 0) err(1, "seteuid failed"); \
 }

usr.sbin/lpr/common_source/net.c

@@ -80,8 +80,6 @@ u_char	family = PF_UNSPEC;
 u_char	family = PF_INET;
 #endif
 
-extern uid_t	uid, euid;
-
 /*
  * Create a TCP connection to host "rhost" at port "rport".
  * If rport == 0, then use the printer service port.

usr.sbin/lpr/common_source/rmjob.c

@@ -69,8 +69,6 @@ static int	all = 0;		/* eliminate all files (root only) */
 static int	cur_daemon;		/* daemon's pid */
 static char	current[7+MAXHOSTNAMELEN];  /* active control file name */
 
-extern uid_t	uid, euid;		/* real and effective user id's */
-
 static	void	alarmhandler(int _signo);
 static	void	do_unlink(char *_file);
 static int	 isowner(char *_owner, char *_file, const char *_cfhost);

usr.sbin/lpr/common_source/startdaemon.c

@@ -49,8 +49,6 @@ __FBSDID("$FreeBSD$");
 #include "lp.h"
 #include "pathnames.h"
 
-extern uid_t	uid, euid;
-
 /*
  * Tell the printer daemon that there are new files in the spool directory.
  */

usr.sbin/lpr/filters/lpf.c

@@ -60,17 +60,17 @@ __FBSDID("$FreeBSD$");
 #define MAXWIDTH  132
 #define MAXREP    10
 
-char	buf[MAXREP][MAXWIDTH];
-int	maxcol[MAXREP] = {-1};
-int	lineno;
-int	width = 132;	/* default line length */
-int	length = 66;	/* page length */
-int	indent;		/* indentation length */
-int	npages = 1;
-int	literal;	/* print control characters */
-char	*name;		/* user's login name */
-char	*host;		/* user's machine name */
-char	*acctfile;	/* accounting information file */
+static char	buf[MAXREP][MAXWIDTH];
+static int	maxcol[MAXREP] = {-1};
+static int	lineno;
+static int	width = 132;	/* default line length */
+static int	length = 66;	/* page length */
+static int	indent;		/* indentation length */
+static int	npages = 1;
+static int	literal;	/* print control characters */
+static char	*name;		/* user's login name */
+static char	*host;		/* user's machine name */
+static char	*acctfile;	/* accounting information file */
 
 int
 main(int argc, char *argv[])