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ash: simplify EOF/newline handling in list parser

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Processing of here documents in ash has had a couple of breakages
which are now the subject of tests.  This commit should fix both.

It is based on the following commit in dash git by Herbert Xu:

   <7c245aa> [PARSER] Simplify EOF/newline handling in list parser

(See git://git.kernel.org/pub/scm/utils/dash/dash.git)

Reported-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston 2015-10-29 11:30:55 +00:00 committed by Denys Vlasenko
parent 6bd2fabc52
commit c0e007663d
1 changed files with 29 additions and 34 deletions
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63
shell/ash.c
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@ -10524,7 +10524,7 @@ static union node *andor(void);
static union node *pipeline(void);
static union node *parse_command(void);
static void parseheredoc(void);
static char peektoken(void);
static int peektoken(void);
static int readtoken(void);
static union node *
@ -10533,11 +10533,27 @@ list(int nlflag)
union node *n1, *n2, *n3;
int tok;
checkkwd = CHKNL | CHKKWD | CHKALIAS;
if (nlflag == 2 && peektoken())
return NULL;
n1 = NULL;
for (;;) {
switch (peektoken()) {
case TNL:
if (!(nlflag & 1))
break;
parseheredoc();
return n1;
case TEOF:
if (!n1 && (nlflag & 1))
n1 = NODE_EOF;
parseheredoc();
return n1;
}
checkkwd = CHKNL | CHKKWD | CHKALIAS;
if (nlflag == 2 && tokname_array[peektoken()][0])
return n1;
nlflag |= 2;
n2 = andor();
tok = readtoken();
if (tok == TBACKGND) {
@ -10563,30 +10579,15 @@ list(int nlflag)
n1 = n3;
}
switch (tok) {
case TNL:
case TEOF:
tokpushback = 1;
/* fall through */
case TBACKGND:
case TSEMI:
tok = readtoken();
/* fall through */
case TNL:
if (tok == TNL) {
parseheredoc();
if (nlflag == 1)
return n1;
} else {
tokpushback = 1;
}
checkkwd = CHKNL | CHKKWD | CHKALIAS;
if (peektoken())
return n1;
break;
case TEOF:
if (heredoclist)
parseheredoc();
else
pungetc(); /* push back EOF on input */
return n1;
default:
if (nlflag == 1)
if ((nlflag & 1))
raise_error_unexpected_syntax(-1);
tokpushback = 1;
return n1;
@ -11954,14 +11955,14 @@ readtoken(void)
return t;
}
static char
static int
peektoken(void)
{
int t;
t = readtoken();
tokpushback = 1;
return tokname_array[t][0];
return t;
}
/*
@ -11971,18 +11972,12 @@ peektoken(void)
static union node *
parsecmd(int interact)
{
int t;
tokpushback = 0;
checkkwd = 0;
heredoclist = 0;
doprompt = interact;
setprompt_if(doprompt, doprompt);
needprompt = 0;
t = readtoken();
if (t == TEOF)
return NODE_EOF;
if (t == TNL)
return NULL;
tokpushback = 1;
return list(1);
}