less: use __progname

[Michael Reed]

Not sure if such changes which diverge from upstream are wanted,
but here it is.



Index: less.h
===================================================================
RCS file: /cvs/src/usr.bin/less/less.h,v
retrieving revision 1.11
diff -u -p -r1.11 less.h
--- less.h      5 Nov 2015 22:18:27 -0000       1.11
+++ less.h      5 Nov 2015 23:14:31 -0000
@@ -32,7 +32,6 @@
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
-#include <libgen.h>
 #include <signal.h>
 
 /*
Index: main.c
===================================================================
RCS file: /cvs/src/usr.bin/less/main.c,v
retrieving revision 1.18
diff -u -p -r1.18 main.c
--- main.c      5 Nov 2015 22:18:27 -0000       1.18
+++ main.c      5 Nov 2015 23:14:31 -0000
@@ -15,7 +15,6 @@
  * Entry point, initialization, miscellaneous routines.
  */
 
-#include <libgen.h>
 #include <stdarg.h>
 #include <sys/types.h>
 #include "less.h"
@@ -31,7 +30,7 @@ off_t start_attnpos = -1;
 off_t  end_attnpos = -1;
 int    wscroll;
 
-static char    *progname;
+extern char    *__progname;
 
 int    quitting;
 int    secure;
@@ -68,7 +67,6 @@ main(int argc, char *argv[])
        IFILE ifile;
        char *s;
 
-       progname = basename(argv[0]);
        argv++;
        argc--;
 
@@ -77,8 +75,8 @@ main(int argc, char *argv[])
         * act like LESS_IS_MORE is set.  We have to set this as early
         * as possible for POSIX.
         */
-       if ((strcmp(progname, "more") == 0) ||
-           (strcmp(progname, "page") == 0)) {
+       if ((strcmp(__progname, "more") == 0) ||
+           (strcmp(__progname, "page") == 0)) {
                less_is_more = 1;
        } else {
                s = lgetenv("LESS_IS_MORE");