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ash: [EXPAND] Split unquoted $@/$* correctly when IFS is set but empty

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Upstream commit:

    Date: Wed, 8 Oct 2014 15:24:23 +0800
    [EXPAND] Split unquoted $@/$* correctly when IFS is set but empty

    Currently we do not field-split $@/$* when it isn't quoted and IFS
    is set but empty.  This is obviously wrong.  This patch fixes this.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-10-01 20:35:10 +02:00
parent a2633aa819
commit c4d4380a07
5 changed files with 101 additions and 5 deletions
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14
shell/ash.c
View File

@ -6606,7 +6606,7 @@ subevalvar(char *p, char *varname, int strloc, int subtype,
* ash -c 'echo ${#1#}' name:'1=#'
*/
static NOINLINE ssize_t
varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
varvalue(char *name, int varflags, int flags, struct strlist *var_str_list, int *nulonly)
{
const char *p;
int num;
@ -6619,7 +6619,8 @@ varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
int syntax = quoted ? DQSYNTAX : BASESYNTAX;
sep = quoted ? ((flags & EXP_FULL) << CHAR_BIT) : 0;
sep = *nulonly ? (flags & EXP_FULL) << CHAR_BIT : 0;
*nulonly = 0;
switch (*name) {
case '$':
@ -6664,10 +6665,11 @@ varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
}
/* fall through */
case '*':
sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
sep |= ifsset() ? (unsigned char)(ifsval()[0]) : ' ';
param:
ap = shellparam.p;
sepc = sep;
*nulonly = !sepc;
if (!ap)
return -1;
while ((p = *ap++) != NULL) {
@ -6757,6 +6759,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
char subtype;
int quoted;
char easy;
int nulonly;
char *var;
int patloc;
int startloc;
@ -6767,11 +6770,12 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
quoted = flags & EXP_QUOTED;
var = p;
easy = (!quoted || (*var == '@' && shellparam.nparam));
nulonly = easy;
startloc = expdest - (char *)stackblock();
p = strchr(p, '=') + 1; //TODO: use var_end(p)?
again:
varlen = varvalue(var, varflags, flags, var_str_list);
varlen = varvalue(var, varflags, flags, var_str_list, &nulonly);
if (varflags & VSNUL)
varlen--;
@ -6865,7 +6869,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
/* Remove any recorded regions beyond start of variable */
removerecordregions(startloc);
record:
recordregion(startloc, expdest - (char *)stackblock(), quoted);
recordregion(startloc, expdest - (char *)stackblock(), nulonly);
}
end:

25
shell/ash_test/ash-vars/var_wordsplit_ifs1.right Normal file
View File

@ -0,0 +1,25 @@
Testing: !IFS $*
.abc.
.d.
.e.
Testing: !IFS $@
.abc.
.d.
.e.
Testing: !IFS "$*"
.abc d e.
Testing: !IFS "$@"
.abc.
.d e.
Testing: IFS="" $*
.abc.
.d e.
Testing: IFS="" $@
.abc.
.d e.
Testing: IFS="" "$*"
.abcd e.
Testing: IFS="" "$@"
.abc.
.d e.
Finished

21
shell/ash_test/ash-vars/var_wordsplit_ifs1.tests Executable file
View File

@ -0,0 +1,21 @@
set -- abc "d e"
echo 'Testing: !IFS $*'
unset IFS; for a in $*; do echo ".$a."; done
echo 'Testing: !IFS $@'
unset IFS; for a in $@; do echo ".$a."; done
echo 'Testing: !IFS "$*"'
unset IFS; for a in "$*"; do echo ".$a."; done
echo 'Testing: !IFS "$@"'
unset IFS; for a in "$@"; do echo ".$a."; done
echo 'Testing: IFS="" $*'
IFS=""; for a in $*; do echo ".$a."; done
echo 'Testing: IFS="" $@'
IFS=""; for a in $@; do echo ".$a."; done
echo 'Testing: IFS="" "$*"'
IFS=""; for a in "$*"; do echo ".$a."; done
echo 'Testing: IFS="" "$@"'
IFS=""; for a in "$@"; do echo ".$a."; done
echo Finished

25
shell/hush_test/hush-vars/var_wordsplit_ifs1.right Normal file
View File

@ -0,0 +1,25 @@
Testing: !IFS $*
.abc.
.d.
.e.
Testing: !IFS $@
.abc.
.d.
.e.
Testing: !IFS "$*"
.abc d e.
Testing: !IFS "$@"
.abc.
.d e.
Testing: IFS="" $*
.abc.
.d e.
Testing: IFS="" $@
.abc.
.d e.
Testing: IFS="" "$*"
.abcd e.
Testing: IFS="" "$@"
.abc.
.d e.
Finished

21
shell/hush_test/hush-vars/var_wordsplit_ifs1.tests Executable file
View File

@ -0,0 +1,21 @@
set -- abc "d e"
echo 'Testing: !IFS $*'
unset IFS; for a in $*; do echo ".$a."; done
echo 'Testing: !IFS $@'
unset IFS; for a in $@; do echo ".$a."; done
echo 'Testing: !IFS "$*"'
unset IFS; for a in "$*"; do echo ".$a."; done
echo 'Testing: !IFS "$@"'
unset IFS; for a in "$@"; do echo ".$a."; done
echo 'Testing: IFS="" $*'
IFS=""; for a in $*; do echo ".$a."; done
echo 'Testing: IFS="" $@'
IFS=""; for a in $@; do echo ".$a."; done
echo 'Testing: IFS="" "$*"'
IFS=""; for a in "$*"; do echo ".$a."; done
echo 'Testing: IFS="" "$@"'
IFS=""; for a in "$@"; do echo ".$a."; done
echo Finished