Change interpretation of '\"' in here documents with substitution
according to SUSv3 and other modern shells (POSIX allows both). Idea for the patch (add another lex state) from OpenBSD, but the implementation differs slightly (and is better in quality). Also add two testcases (/bin/sh passes both, old mksh only one), and document the change in the manual page. Sync RCS IDs with OBSD.
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tg
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26
check.t
26
check.t
@ -1,4 +1,4 @@
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# $MirOS: src/bin/mksh/check.t,v 1.34 2005/10/25 21:11:25 tg Exp $
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# $MirOS: src/bin/mksh/check.t,v 1.35 2005/11/22 18:36:19 tg Exp $
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# $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
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# $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
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# $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
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@ -1214,6 +1214,30 @@ expected-stdout:
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h\b
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done
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---
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name: heredoc-quoting-unsubst
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description:
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Check for correct handling of quoted characters in
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here documents without substitution (marker is quoted).
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stdin:
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foo=bar
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cat <<-'EOF'
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x " \" \ \\ $ \$ `echo baz` \`echo baz\` $foo \$foo x
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EOF
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expected-stdout:
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x " \" \ \\ $ \$ `echo baz` \`echo baz\` $foo \$foo x
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---
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name: heredoc-quoting-subst
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description:
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Check for correct handling of quoted characters in
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here documents with substitution (marker is not quoted).
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stdin:
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foo=bar
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cat <<-EOF
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x " \" \ \\ $ \$ `echo baz` \`echo baz\` $foo \$foo x
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EOF
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expected-stdout:
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x " \" \ \ $ $ baz `echo baz` bar $foo x
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---
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name: heredoc-tmpfile-1
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description:
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Check that heredoc temp files aren't removed too soon or too late.
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8
exec.c
8
exec.c
@ -1,9 +1,9 @@
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/** $MirOS: src/bin/mksh/exec.c,v 1.10 2005/10/25 19:53:27 tg Exp $ */
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/* $OpenBSD: exec.c,v 1.41 2005/03/30 17:16:37 deraadt Exp $ */
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/** $MirOS: src/bin/mksh/exec.c,v 1.11 2005/11/22 18:36:19 tg Exp $ */
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/* $OpenBSD: exec.c,v 1.42 2005/09/11 18:02:27 otto Exp $ */
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.10 2005/10/25 19:53:27 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.11 2005/11/22 18:36:19 tg Exp $");
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static int comexec(struct op *, struct tbl *volatile, char **,
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int volatile);
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@ -1170,7 +1170,7 @@ herein(const char *content, int sub)
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s = pushs(SSTRING, ATEMP);
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s->start = s->str = content;
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source = s;
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if (yylex(ONEWORD) != LWORD)
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if (yylex(ONEWORD|HEREDOC) != LWORD)
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internal_errorf(1, "herein: yylex");
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source = osource;
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shf_puts(evalstr(yylval.cp, 0), shf);
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13
lex.c
13
lex.c
@ -1,9 +1,9 @@
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/** $MirOS: src/bin/mksh/lex.c,v 1.8 2005/10/25 19:53:28 tg Exp $ */
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/* $OpenBSD: lex.c,v 1.36 2005/03/30 17:16:37 deraadt Exp $ */
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/** $MirOS: src/bin/mksh/lex.c,v 1.9 2005/11/22 18:36:19 tg Exp $ */
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/* $OpenBSD: lex.c,v 1.37 2005/09/11 18:02:27 otto Exp $ */
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/lex.c,v 1.8 2005/10/25 19:53:28 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/lex.c,v 1.9 2005/11/22 18:36:19 tg Exp $");
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/* Structure to keep track of the lexing state and the various pieces of info
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* needed for each particular state. */
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@ -218,11 +218,16 @@ yylex(int cf)
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case '\\':
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c = getsc();
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switch (c) {
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case '"': case '\\':
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case '"':
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if ((cf & HEREDOC))
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goto heredocquote;
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/* FALLTROUGH */
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case '\\':
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case '$': case '`':
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*wp++ = QCHAR, *wp++ = c;
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break;
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default:
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heredocquote:
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Xcheck(ws, wp);
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if (c) { /* trailing \ is lost */
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*wp++ = CHAR, *wp++ = '\\';
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19
mksh.1
19
mksh.1
@ -1,4 +1,4 @@
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.\" $MirOS: src/bin/mksh/mksh.1,v 1.24 2005/11/22 18:09:18 tg Exp $
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.\" $MirOS: src/bin/mksh/mksh.1,v 1.25 2005/11/22 18:36:20 tg Exp $
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.\" $OpenBSD: ksh.1,v 1.107 2005/11/16 12:49:21 jmc Exp $
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.\" $OpenBSD: sh.1tbl,v 1.53 2004/12/10 01:56:56 jaredy Exp $
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.\"
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@ -1849,9 +1849,9 @@ escapes for
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.Ql ` ,
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.Ql \e ,
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and
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.Ql \enewline ;
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any backslash preceding double quotes is removed (see
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.Sx BUGS ) .
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.Ql \enewline .
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Handling of double quotes follows
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.St -susv3 .
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If multiple here documents are used on the same command line, they are saved in
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order.
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.It \*(Lt\*(Lt- Ar marker
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@ -5146,7 +5146,8 @@ Privileged shell profile.
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.Sh AUTHORS
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This shell is based on the public domain korn shell.
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It has been developed further by the MirOS project
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incorporating changes from the OpenBSD project.
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incorporating changes from the Debian and OpenBSD
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projects and suggestions from many people.
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.Sh BUGS
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Please report bugs in
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.Nm
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@ -5154,14 +5155,6 @@ to the
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.Mx
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development team.
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.Pp
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Quoting rules for here documents are the same as for
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double-quoted strings due to legacy reasons; this conforms with
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.St -p1003.2-92
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interpretation #104 and considered a feature of
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.Nm
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despite breaking compatibility with
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.St -susv3 .
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.Pp
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By the way, the most frequently reported bug is:
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.Bd -literal -offset indent
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$ print hi | read a; print $a # Does not show hi
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5
sh.h
5
sh.h
@ -1,10 +1,10 @@
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/** $MirOS: src/bin/mksh/sh.h,v 1.21 2005/10/25 19:53:28 tg Exp $ */
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/** $MirOS: src/bin/mksh/sh.h,v 1.22 2005/11/22 18:36:20 tg Exp $ */
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/* $OpenBSD: sh.h,v 1.28 2005/10/04 20:35:11 otto Exp $ */
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/* $OpenBSD: shf.h,v 1.5 2005/03/30 17:16:37 deraadt Exp $ */
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/* $OpenBSD: table.h,v 1.6 2004/12/18 20:55:52 millert Exp $ */
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/* $OpenBSD: tree.h,v 1.10 2005/03/28 21:28:22 deraadt Exp $ */
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/* $OpenBSD: expand.h,v 1.6 2005/03/30 17:16:37 deraadt Exp $ */
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/* $OpenBSD: lex.h,v 1.9 2004/12/18 21:04:52 millert Exp $ */
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/* $OpenBSD: lex.h,v 1.10 2005/09/11 18:02:27 otto Exp $ */
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/* $OpenBSD: proto.h,v 1.27 2005/10/06 06:39:36 otto Exp $ */
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/* $OpenBSD: c_test.h,v 1.4 2004/12/20 11:34:26 otto Exp $ */
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/* $OpenBSD: tty.h,v 1.5 2004/12/20 11:34:26 otto Exp $ */
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@ -954,6 +954,7 @@ typedef union {
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#define CMDWORD BIT(8) /* parsing simple command (alias related) */
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#define HEREDELIM BIT(9) /* parsing <<,<<- delimiter */
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#define LQCHAR BIT(10) /* source string contains QCHAR */
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#define HEREDOC BIT(11) /* parsing a here document */
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#define HERES 10 /* max << in line */
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