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sh_subsavefd(): avoid a negative shift operand

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This change is backported from the abandoned ksh 93v- beta.

src/cmd/ksh93/sh/subshell.c: sh_subsavefd():
- Do not subtract 1 from fd, as this would cause a negative shift
  operand for stdin (fd==0).
This commit is contained in:
Martijn Dekker 2021-01-19 18:23:14 +00:00
parent ba6fc164d7
commit de7eb85255
1 changed files with 3 additions and 3 deletions
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6
src/cmd/ksh93/sh/subshell.c
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@ -90,7 +90,7 @@ static struct subshell
char jobcontrol; char jobcontrol;
char monitor; char monitor;
unsigned char fdstatus; unsigned char fdstatus;
int fdsaved; /* bit make for saved files */ int fdsaved; /* bit mask for saved file descriptors */
int sig; /* signal for $$ */ int sig; /* signal for $$ */
pid_t bckpid; pid_t bckpid;
pid_t cpid; pid_t cpid;
@ -457,8 +457,8 @@ int sh_subsavefd(register int fd)
register int old=0; register int old=0;
if(sp) if(sp)
{ {
old = !(sp->fdsaved&(1<<(fd-1))); old = !(sp->fdsaved&(1<<fd));
sp->fdsaved |= (1<<(fd-1)); sp->fdsaved |= (1<<fd);
} }
return(old); return(old);
} }