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read -r -d should not ignore -r

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This bug was previously reported in att/ast#37.
Ksh ignores `-r` when `read -r -d` is run because when
the bit for `D_FLAG` is set, the bit for `R_FLAG` is unset
as a side effect of setting `D_FLAG`. The following set
of commands fails to print a backslash:

$ printf '\\\000' | read -r -d ''
$ echo $REPLY

The fix for this bug is to set `D_FLAG` with `D_FLAG + 1`,
which prevents `R_FLAG` from being unset. This bugfix
has been backported from ksh93v- 2013-10-10-alpha.

src/cmd/ksh93/bltins/read.c:
 - Set `D_FLAG` with `D_FLAG + 1` to prevent the bit for
   `R_FLAG` from being unset.

src/cmd/ksh93/tests/builtins.sh:
 - Add the regression test for `read -r -d` from ksh93v-.
This commit is contained in:
Johnothan King 2020-06-16 04:21:42 -07:00 • committed by Martijn Dekker
parent ad349c7668
commit 764acefaf1
4 changed files with 14 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/cmd/ksh93/bltins/read.c
View file

@ -103,8 +103,8 @@ int b_read(int argc,char *argv[], Shbltin_t *context)
if(opt_info.arg && *opt_info.arg!='\n')
{
char *cp = opt_info.arg;
flags &= ~((1<<D_FLAG)-1);
flags |= (mbchar(cp)<< D_FLAG);
flags &= ((1<<D_FLAG+1)-1);
flags |= (mbchar(cp)<<D_FLAG+1) | (1<<D_FLAG);
}
break;
case 'p':
@ -283,7 +283,7 @@ int sh_readline(register Shell_t *shp,char **names, volatile int fd, int flags,s
tty_raw(fd,1);
if(!(flags&(N_FLAG|NN_FLAG)))
{
delim = ((unsigned)flags)>>D_FLAG;
delim = ((unsigned)flags)>>(D_FLAG+1);
ep->e_nttyparm.c_cc[VEOL] = delim;
ep->e_nttyparm.c_lflag |= ISIG;
tty_set(fd,TCSADRAIN,&ep->e_nttyparm);