* Re-implement colour support using termcap's AF and AB capabilities

to manage the ANSI colour sequences.  Colour support is disabled
  unless the TERM environment variable references a valid termcap.

* Allow optional compilation of the colour support in the Makefile,
  defaulting to yes.  This allows us to switch it off for fixit
  floppies and other mediums where space is an issue and the extra
  bloat of statically linking with ncurses isn't acceptable.

* Display a warning if colour is requested with '-G' but support
  for it isn't compiled in.

bin/ls/Makefile

@@ -6,4 +6,7 @@ PROG=	ls
 SRCS=	cmp.c setflags.c ls.c print.c util.c
 .PATH:	${.CURDIR}/../../lib/libc/gen
 
+CFLAGS+= -DCOLORLS
+LDADD=  -lncurses
+
 .include <bsd.prog.mk>

bin/ls/extern.h

@@ -51,5 +51,8 @@ void	 printscol __P((DISPLAY *));
 void	 usage __P((void));
 int	 len_octal __P((char *, int));
 int	 prn_octal __P((char *));
+#ifdef COLORLS
 void	 parsecolors __P((char *cs));
 int	 colortype __P((mode_t mode));
+void	 endcolor __P((void));
+#endif

bin/ls/ls.c

@@ -53,6 +53,9 @@ static const char rcsid[] =
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 
+#ifdef COLORLS
+#include <curses.h>
+#endif
 #include <dirent.h>
 #include <err.h>
 #include <errno.h>
@@ -62,6 +65,9 @@ static const char rcsid[] =
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifdef COLORLS
+#include <term.h>
+#endif
 #include <unistd.h>
 
 #include "ls.h"
@@ -111,7 +117,9 @@ int f_statustime;		/* use time of last mode change */
 int f_timesort;			/* sort by time vice name */
 int f_type;			/* add type character for non-regular files */
 int f_whiteout;			/* show whiteout entries */
+#ifdef COLORLS
 int f_color;			/* add type in color for non-regular files */
+#endif
 
 int rval;
 
@@ -189,7 +197,12 @@ main(argc, argv)
 			break;
 		case 'G':
 			if (isatty(STDOUT_FILENO))
-				f_color = 1;
+#ifdef COLORLS
+				if (tgetent(NULL, getenv("TERM")) == 1)
+					f_color = 1;
+#else
+				(void)fprintf(stderr, "Color support not compiled in.\n");
+#endif
 			break;
 		case 'L':
 			fts_options &= ~FTS_PHYSICAL;
@@ -264,8 +277,10 @@ main(argc, argv)
 	argc -= optind;
 	argv += optind;
 
+#ifdef COLORLS
 	if (f_color)
 		parsecolors(getenv("LSCOLORS"));
+#endif
 
 	/*
 	 * If not -F, -i, -l, -s or -t options, don't require stat
@@ -273,7 +288,10 @@ main(argc, argv)
 	 * need this to determine which colors to display.
 	 */
 	if (!f_inode && !f_longform && !f_size && !f_timesort && !f_type
-	    && !f_color)
+#ifdef COLORLS
+	    && !f_color
+#endif
+	   )
 		fts_options |= FTS_NOSTAT;
 
 	/*

bin/ls/ls.h

@@ -53,7 +53,9 @@ extern int f_size;		/* list size in short listing */
 extern int f_statustime;	/* use time of last mode change */
 extern int f_notabs;		/* don't use tab-separated multi-col output */
 extern int f_type;		/* add type character for non-regular files */
+#ifdef COLORLS
 extern int f_color;		/* add type in color for non-regular files */
+#endif
 
 typedef struct {
 	FTSENT *list;

bin/ls/print.c

@@ -46,6 +46,10 @@ static const char rcsid[] =
 #include <sys/param.h>
 #include <sys/stat.h>
 
+#ifdef COLORLS
+#include <ctype.h>
+#include <curses.h>
+#endif
 #include <err.h>
 #include <errno.h>
 #include <fts.h>
@@ -54,9 +58,11 @@ static const char rcsid[] =
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifdef COLORLS
+#include <term.h>
+#endif
 #include <time.h>
 #include <unistd.h>
-#include <ctype.h>
 
 #include "ls.h"
 #include "extern.h"
@@ -68,6 +74,7 @@ static int	printtype __P((u_int));
 
 #define	IS_NOPRINT(p)	((p)->fts_number == NO_PRINT)
 
+#ifdef COLORLS
 /* Most of these are taken from <sys/stat.h> */
 typedef enum Colors {
     C_DIR,     /* directory */
@@ -87,6 +94,7 @@ typedef enum Colors {
 char *defcolors = "4x5x2x3x1x464301060203";
 
 static int colors[C_NUMCOLORS][2];
+#endif
 
 void
 printscol(dp)
@@ -149,12 +157,16 @@ printlong(dp)
 			printtime(sp->st_ctime);
 		else
 			printtime(sp->st_mtime);
+#ifdef COLORLS
 		if (f_color)
 			(void)colortype(sp->st_mode);
+#endif
 		if (f_octal || f_octal_escape) (void)prn_octal(p->fts_name);
 		else (void)printf("%s", p->fts_name);
+#ifdef COLORLS
 		if (f_color)
-			(void)printf("\033[m");
+			endcolor();
+#endif
 		if (f_type)
 			(void)printtype(sp->st_mode);
 		if (S_ISLNK(sp->st_mode))
@@ -224,6 +236,7 @@ printcol(dp)
 			    dp->s_block);
 			if ((base += numrows) >= num)
 				break;
+#ifdef COLORLS
 			/*
 			 * some terminals get confused if we mix tabs
 			 * with color sequences
@@ -234,6 +247,7 @@ printcol(dp)
 					chcnt = cnt;
 				}
 			else
+#endif
 			while ((cnt = ((chcnt + tabwidth) & ~(tabwidth - 1)))
 			    <= endcol){
 				(void)putchar(f_notabs ? ' ' : '\t');
@@ -264,12 +278,16 @@ printaname(p, inodefield, sizefield)
 	if (f_size)
 		chcnt += printf("%*qd ",
 		    (int)sizefield, howmany(sp->st_blocks, blocksize));
+#ifdef COLORLS
 	if (f_color)
 		(void)colortype(sp->st_mode);
+#endif
 	chcnt += (f_octal || f_octal_escape) ? prn_octal(p->fts_name)
 	                                     : printf("%s", p->fts_name);
+#ifdef COLORLS
 	if (f_color)
-		printf("\033[m");
+		endcolor();
+#endif
 	if (f_type)
 		chcnt += printtype(sp->st_mode);
 	return (chcnt);
@@ -333,19 +351,36 @@ printtype(mode)
 	return (0);
 }
 
+#ifdef COLORLS
+static char tcapbuf[512];
 void
 printcolor(c)
        Colors c;
 {
-	printf("\033[");
+	char *bp = tcapbuf;
+	char *ansiseq;
+
 	if (colors[c][0] != -1) {
-		printf("3%d", colors[c][0]);
+		ansiseq = tparm(tgetstr("AF", &bp), colors[c][0]);
-		if (colors[c][1] != -1)
+		if (ansiseq)
-		    printf(";");
+			putp(ansiseq);
 	}
-	if (colors[c][1] != -1)
+
-	    printf("4%d", colors[c][1]);
+	if (colors[c][1] != -1) {
-	printf("m");
+		ansiseq = tparm(tgetstr("AB", &bp), colors[c][1]);
+		if (ansiseq)
+			putp(ansiseq);
+	}
+}
+
+void
+endcolor()
+{
+	char *bp = tcapbuf;
+	char *ansiseq;
+	ansiseq = tgetstr("se", &bp);
+	if (ansiseq)
+		putp(ansiseq);
 }
 
 int
@@ -422,6 +457,7 @@ char *cs;
 		}
 	}
 }
+#endif /*COLORLS*/
  
 static void
 printlink(p)