add limited support for format builtin in gnu-m4 mode, because I'm fed

up of patching it away in various autoconf derivatives.

okay miod@

6 files changed, 73 insertions, 7 deletions

diff --git a/usr.bin/m4/eval.c b/usr.bin/m4/eval.c
index 8a841a2b2f6..fc2b0ab4448 100644
--- a/usr.bin/m4/eval.c
+++ b/usr.bin/m4/eval.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: eval.c,v 1.60 2006/03/20 10:55:19 espie Exp $	*/
+/*	$OpenBSD: eval.c,v 1.61 2006/03/20 20:27:45 espie Exp $	*/
 /*	$NetBSD: eval.c,v 1.7 1996/11/10 21:21:29 pk Exp $	*/
 
 /*
@@ -283,6 +283,12 @@ expand_builtin(const char *argv[], int argc, int td)
 		if (argc > 2)
 			(void) dopaste(argv[2]);
 		break;
+	case FORMATTYPE:
+		if (mimic_gnu)
+			doformat(argv, argc);
+		else
+			m4errx(1, "format builtin is only available in gnu-m4 mode.");
+		break;
 #endif
 	case CHNQTYPE:
 		dochq(argv, ac);
diff --git a/usr.bin/m4/extern.h b/usr.bin/m4/extern.h
index 93f873882ca..01df741404a 100644
--- a/usr.bin/m4/extern.h
+++ b/usr.bin/m4/extern.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: extern.h,v 1.44 2006/03/20 10:55:19 espie Exp $	*/
+/*	$OpenBSD: extern.h,v 1.45 2006/03/20 20:27:45 espie Exp $	*/
 /*	$NetBSD: extern.h,v 1.3 1996/01/13 23:25:24 pk Exp $	*/
 
 /*-
@@ -55,7 +55,8 @@ extern void doprintlineno(struct input_file *);
 extern void doprintfilename(struct input_file *);
 
 extern void doesyscmd(const char *);
-extern void	getdivfile(const char *);
+extern void getdivfile(const char *);
+extern void doformat(const char *[], int);
  
 
 /* look.c */
diff --git a/usr.bin/m4/gnum4.c b/usr.bin/m4/gnum4.c
index 0b71338263f..973df3b030c 100644
--- a/usr.bin/m4/gnum4.c
+++ b/usr.bin/m4/gnum4.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: gnum4.c,v 1.32 2006/03/20 10:55:19 espie Exp $ */
+/* $OpenBSD: gnum4.c,v 1.33 2006/03/20 20:27:45 espie Exp $ */
 
 /*
  * Copyright (c) 1999 Marc Espie
@@ -503,6 +503,52 @@ doregexp(const char *argv[], int argc)
 }
 
 void
+doformat(const char *argv[], int argc)
+{
+	const char *format = argv[2];
+	int pos = 3;
+	while (*format != 0) {
+		if (*format != '%') {
+			addchar(*format++);
+		} else {
+			format++;
+			if (*format == '%' || *format == 0) {
+				addchar('%');
+				if (*format == '%')
+					format++;
+			} else {
+			    int left_padded = 0;
+			    unsigned long width;
+			    size_t l;
+
+			    if (*format == '-') {
+			    	left_padded = 1;
+				format++;
+			    }
+			    width = strtoul(format, &format, 10);
+			    if (*format != 's') {
+			    	m4errx(1, "Unsupported format specification: %s.", argv[2]);
+			    }
+			    format++;
+			    if (pos >= argc)
+			    	m4errx(1, "Format with too many values.");
+			    l = strlen(argv[pos]);
+			    if (!left_padded) {
+				    while (l < width--)
+					    addchar(' ');
+			    }
+			    addchars(argv[pos++], l);
+			    if (left_padded) {
+			    	while (l < width--)
+					addchar(' ');
+			    }
+			}
+		}
+	}
+	pbstr(getstring());
+}
+
+void
 doesyscmd(const char *cmd)
 {
 	int p[2];
diff --git a/usr.bin/m4/m4.1 b/usr.bin/m4/m4.1
index ca688d3bcc0..60c9440afce 100644
--- a/usr.bin/m4/m4.1
+++ b/usr.bin/m4/m4.1
@@ -1,4 +1,4 @@
-.\"	@(#) $OpenBSD: m4.1,v 1.43 2005/09/30 20:34:26 jaredy Exp $
+.\"	@(#) $OpenBSD: m4.1,v 1.44 2006/03/20 20:27:45 espie Exp $
 .\"
 .\" Copyright (c) 1989, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -251,6 +251,16 @@ specifies the minimum number of digits in the result.
 .It Fn expr expr
 This is an alias for
 .Ic eval .
+.It Fn format formatstring arg1 ...
+Returns 
+.Fa formatstring 
+with escape sequences substituted with
+.Fa arg1
+and following arguments, in a way similar to
+.Xr printf 3 .
+This built-in is only available in GNU-m4 compatibility mode, and the 
+left-padding flag, an optional field width and the %s data type 
+are the only supported parameters.
 .It Fn ifdef name yes no
 If the macro named by the first argument is defined then return the second
 argument, otherwise the third.
@@ -439,6 +449,7 @@ For portability, one should not use the macros
 .Ic builtin ,
 .Ic esycmd ,
 .Ic expr ,
+.Ic format ,
 .Ic indir ,
 .Ic paste ,
 .Ic patsubst ,
diff --git a/usr.bin/m4/main.c b/usr.bin/m4/main.c
index f489cd38b6d..3ade512698f 100644
--- a/usr.bin/m4/main.c
+++ b/usr.bin/m4/main.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: main.c,v 1.70 2006/03/20 10:55:19 espie Exp $	*/
+/*	$OpenBSD: main.c,v 1.71 2006/03/20 20:27:45 espie Exp $	*/
 /*	$NetBSD: main.c,v 1.12 1997/02/08 23:54:49 cgd Exp $	*/
 
 /*-
@@ -111,6 +111,7 @@ struct keyblk keywrds[] = {	/* m4 keywords to be installed */
 	{ "esyscmd",	  ESYSCMDTYPE},
 	{ "__file__",	  FILENAMETYPE | NOARGS},
 	{ "__line__",	  LINETYPE | NOARGS},
+	{ "format",	  FORMATTYPE},
 #endif
 	{ "popdef",       POPDTYPE },
 	{ "pushdef",      PUSDTYPE },
diff --git a/usr.bin/m4/mdef.h b/usr.bin/m4/mdef.h
index e47dbd93013..d5e97e10234 100644
--- a/usr.bin/m4/mdef.h
+++ b/usr.bin/m4/mdef.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mdef.h,v 1.28 2003/06/30 22:13:33 espie Exp $	*/
+/*	$OpenBSD: mdef.h,v 1.29 2006/03/20 20:27:45 espie Exp $	*/
 /*	$NetBSD: mdef.h,v 1.7 1996/01/13 23:25:27 pk Exp $	*/
 
 /*
@@ -84,6 +84,7 @@
 #define ESYSCMDTYPE	41
 #define TRACEONTYPE	42
 #define TRACEOFFTYPE	43
+#define FORMATTYPE	44
 
 #define BUILTIN_MARKER	"__builtin_"