Date: Thu, 20 Aug 2015 22:05:56 +0000 (UTC) From: Jilles Tjoelker <jilles@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r286973 - in head/bin/sh: . tests/parser Message-ID: <201508202205.t7KM5udU067640@repo.freebsd.org>
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Author: jilles Date: Thu Aug 20 22:05:55 2015 New Revision: 286973 URL: https://svnweb.freebsd.org/changeset/base/286973 Log: sh: Avoid negative character values from $'\Uffffffff' etc. The negative value was not expected and generated the low 8 bits as a byte, which may be an invalid character encoding. The final shift in creating the negative value was undefined as well. Make the temporary variable unsigned to fix this. Added: head/bin/sh/tests/parser/dollar-quote13.0 (contents, props changed) Modified: head/bin/sh/parser.c head/bin/sh/tests/parser/Makefile Modified: head/bin/sh/parser.c ============================================================================== --- head/bin/sh/parser.c Thu Aug 20 21:49:59 2015 (r286972) +++ head/bin/sh/parser.c Thu Aug 20 22:05:55 2015 (r286973) @@ -1195,7 +1195,8 @@ parsebackq(char *out, struct nodelist ** static char * readcstyleesc(char *out) { - int c, v, i, n; + int c, vc, i, n; + unsigned int v; c = pgetc(); switch (c) { @@ -1310,12 +1311,12 @@ readcstyleesc(char *out) default: synerror("Bad escape sequence"); } - v = (char)v; + vc = (char)v; /* * We can't handle NUL bytes. * POSIX says we should skip till the closing quote. */ - if (v == '\0') { + if (vc == '\0') { while ((c = pgetc()) != '\'') { if (c == '\\') c = pgetc(); @@ -1332,9 +1333,9 @@ readcstyleesc(char *out) pungetc(); return out; } - if (SQSYNTAX[v] == CCTL) + if (SQSYNTAX[vc] == CCTL) USTPUTC(CTLESC, out); - USTPUTC(v, out); + USTPUTC(vc, out); return out; } Modified: head/bin/sh/tests/parser/Makefile ============================================================================== --- head/bin/sh/tests/parser/Makefile Thu Aug 20 21:49:59 2015 (r286972) +++ head/bin/sh/tests/parser/Makefile Thu Aug 20 22:05:55 2015 (r286973) @@ -37,6 +37,7 @@ FILES+= dollar-quote9.0 FILES+= dollar-quote10.0 FILES+= dollar-quote11.0 FILES+= dollar-quote12.0 +FILES+= dollar-quote13.0 FILES+= empty-braces1.0 FILES+= empty-cmd1.0 FILES+= for1.0 Added: head/bin/sh/tests/parser/dollar-quote13.0 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/bin/sh/tests/parser/dollar-quote13.0 Thu Aug 20 22:05:55 2015 (r286973) @@ -0,0 +1,8 @@ +# $FreeBSD$ + +# This Unicode escape sequence that has never been in range should either +# fail to expand or expand to a fallback. + +c=$(eval printf %s \$\'\\Uffffff41\' 2>/dev/null) +r=$(($? != 0)) +[ "$r.$c" = '1.' ] || [ "$r.$c" = '0.?' ] || [ "$r.$c" = $'0.\u2222' ]
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