From 0df96793ef6aa103df228d7dfe56099b7d721a15 Mon Sep 17 00:00:00 2001
From: Rocky Bernstein <rocky.bernstein@gmail.com>
Date: Tue, 11 Aug 2009 15:59:33 +1000
Subject: [SHELL] Add preliminary LINENO support

Looks like in contrast to what the dash.1 manual page says, expansion
of PS{1,2,4} does work.

Here is a little patch to set LINENO. The ways in that it is less than
ideal mirror the ways that the line number error reporting is also
less than ideal.

For example if you run this:

(
    x=$((1/0))
    # Just to add another line
    # And another
) # error reports this line

The error reported will be  the closing parenthesis even though I
think most people would prefer the error to be the one where x was
set.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
 ChangeLog    |  4 ++++
 src/input.c  | 10 ++++++++++
 src/input.h  |  1 +
 src/parser.c | 12 ++++++------
 src/var.c    |  1 +
 5 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 247b6e8..a4d814b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2009-08-11  Rocky Bernstein <rocky.bernstein@gmail.com>
+
+	* Add preliminary LINENO support.
+
 2009-08-11  Stefan Potyra <stefan.potyra@informatik.uni-erlangen.de>
 
 	* Honor tab as IFS whitespace when splitting fields in readcmd.
diff --git a/src/input.c b/src/input.c
index 1e198e9..e57ad76 100644
--- a/src/input.c
+++ b/src/input.c
@@ -53,6 +53,7 @@
 #include "alias.h"
 #include "parser.h"
 #include "main.h"
+#include "var.h"
 #ifndef SMALL
 #include "myhistedit.h"
 #endif
@@ -528,3 +529,12 @@ closescript(void)
 		parsefile->fd = 0;
 	}
 }
+
+
+int lineno_inc(void)
+{
+	int lineno = plinno++;
+
+	setvarint("LINENO", lineno, 0);
+	return lineno;
+}
diff --git a/src/input.h b/src/input.h
index 50a7797..bdf8857 100644
--- a/src/input.h
+++ b/src/input.h
@@ -61,6 +61,7 @@ void setinputstring(char *);
 void popfile(void);
 void popallfiles(void);
 void closescript(void);
+int lineno_inc(void);
 
 #define pgetc_macro() \
 	(--parsenleft >= 0 ? (signed char)*parsenextc++ : preadbuffer())
diff --git a/src/parser.c b/src/parser.c
index 28a46c0..be20ff7 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -776,7 +776,7 @@ xxreadtoken(void)
 			continue;
 		case '\\':
 			if (pgetc() == '\n') {
-				startlinno = ++plinno;
+				startlinno = lineno_inc();
 				if (doprompt)
 					setprompt(2);
 				continue;
@@ -784,7 +784,7 @@ xxreadtoken(void)
 			pungetc();
 			goto breakloop;
 		case '\n':
-			plinno++;
+			lineno_inc();
 			needprompt = doprompt;
 			RETURN(TNL);
 		case PEOF:
@@ -886,7 +886,7 @@ readtoken1(int firstc, char const *syntax, char *eofmark, int striptabs)
 				if (syntax == BASESYNTAX)
 					goto endword;	/* exit outer loop */
 				USTPUTC(c, out);
-				plinno++;
+				lineno_inc();
 				if (doprompt)
 					setprompt(2);
 				c = pgetc();
@@ -1065,7 +1065,7 @@ checkend: {
 
 		if (c == '\n' || c == PEOF) {
 			c = PEOF;
-			plinno++;
+			lineno_inc();
 			needprompt = doprompt;
 		} else {
 			int len;
@@ -1315,7 +1315,7 @@ parsebackq: {
 
 			case '\\':
                                 if ((pc = pgetc()) == '\n') {
-					plinno++;
+					lineno_inc();
 					if (doprompt)
 						setprompt(2);
 					/*
@@ -1340,7 +1340,7 @@ parsebackq: {
 				synerror("EOF in backquote substitution");
 
 			case '\n':
-				plinno++;
+				lineno_inc();
 				needprompt = doprompt;
 				break;
 
diff --git a/src/var.c b/src/var.c
index 7f9af9c..2737fb1 100644
--- a/src/var.c
+++ b/src/var.c
@@ -90,6 +90,7 @@ struct var varinit[] = {
 	{ 0,	VSTRFIXED|VTEXTFIXED,		"PS2=> ",	0 },
 	{ 0,	VSTRFIXED|VTEXTFIXED,		"PS4=+ ",	0 },
 	{ 0,	VSTRFIXED|VTEXTFIXED,		"OPTIND=1",	getoptsreset },
+	{ 0,	VSTRFIXED|VTEXTFIXED,		"LINENO=1",	0 },
 #ifndef SMALL
 	{ 0,	VSTRFIXED|VTEXTFIXED|VUNSET,	"TERM\0",	0 },
 	{ 0,	VSTRFIXED|VTEXTFIXED|VUNSET,	"HISTSIZE\0",	sethistsize },
-- 
cgit 1.4.1