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|
bool
do_open(stab,name,len)
STAB *stab;
register char *name;
int len;
{
FILE *fp;
register STIO *stio = stab_io(stab);
char *myname = savestr(name);
int result;
int fd;
int writing = 0;
char mode[3]; /* stdio file mode ("r\0" or "r+\0") */
FILE *saveifp = Nullfp;
FILE *saveofp = Nullfp;
char savetype = ' ';
mode[0] = mode[1] = mode[2] = '\0';
name = myname;
forkprocess = 1; /* assume true if no fork */
while (len && isSPACE(name[len-1]))
name[--len] = '\0';
if (!stio)
stio = stab_io(stab) = stio_new();
else if (stio->ifp) {
fd = fileno(stio->ifp);
if (stio->type == '-')
result = 0;
else if (fd <= maxsysfd) {
saveifp = stio->ifp;
saveofp = stio->ofp;
savetype = stio->type;
result = 0;
}
else if (stio->type == '|')
result = mypclose(stio->ifp);
else if (stio->ifp != stio->ofp) {
if (stio->ofp) {
result = fclose(stio->ofp);
fclose(stio->ifp); /* clear stdio, fd already closed */
}
else
result = fclose(stio->ifp);
}
else
result = fclose(stio->ifp);
if (result == EOF && fd > maxsysfd)
fprintf(stderr,"Warning: unable to close filehandle %s properly.\n",
stab_ename(stab));
stio->ofp = stio->ifp = Nullfp;
}
if (*name == '+' && len > 1 && name[len-1] != '|') { /* scary */
mode[1] = *name++;
mode[2] = '\0';
--len;
writing = 1;
}
else {
mode[1] = '\0';
}
stio->type = *name;
if (*name == '|') {
/*SUPPRESS 530*/
for (name++; isSPACE(*name); name++) ;
TAINT_ENV();
TAINT_PROPER("piped open");
fp = mypopen(name,"w");
writing = 1;
}
else if (*name == '>') {
TAINT_PROPER("open");
name++;
if (*name == '>') {
mode[0] = stio->type = 'a';
name++;
}
else
mode[0] = 'w';
writing = 1;
if (*name == '&') {
duplicity:
name++;
while (isSPACE(*name))
name++;
if (isDIGIT(*name))
fd = atoi(name);
else {
stab = stabent(name,FALSE);
if (!stab || !stab_io(stab)) {
#ifdef EINVAL
errno = EINVAL;
#endif
goto say_false;
}
if (stab_io(stab) && stab_io(stab)->ifp) {
fd = fileno(stab_io(stab)->ifp);
if (stab_io(stab)->type == 's')
stio->type = 's';
}
else
fd = -1;
}
if (!(fp = fdopen(fd = dup(fd),mode))) {
close(fd);
}
}
else {
while (isSPACE(*name))
name++;
if (strEQ(name,"-")) {
fp = stdout;
stio->type = '-';
}
else {
fp = fopen(name,mode);
}
}
}
else {
if (*name == '<') {
mode[0] = 'r';
name++;
while (isSPACE(*name))
name++;
if (*name == '&')
goto duplicity;
if (strEQ(name,"-")) {
fp = stdin;
stio->type = '-';
}
else
fp = fopen(name,mode);
}
else if (name[len-1] == '|') {
TAINT_ENV();
TAINT_PROPER("piped open");
name[--len] = '\0';
while (len && isSPACE(name[len-1]))
name[--len] = '\0';
/*SUPPRESS 530*/
for (; isSPACE(*name); name++) ;
fp = mypopen(name,"r");
stio->type = '|';
}
else {
stio->type = '<';
/*SUPPRESS 530*/
for (; isSPACE(*name); name++) ;
if (strEQ(name,"-")) {
fp = stdin;
stio->type = '-';
}
else
fp = fopen(name,"r");
}
}
if (!fp) {
if (dowarn && stio->type == '<' && index(name, '\n'))
warn(warn_nl, "open");
Safefree(myname);
goto say_false;
}
Safefree(myname);
if (stio->type &&
stio->type != '|' && stio->type != '-') {
if (fstat(fileno(fp),&statbuf) < 0) {
(void)fclose(fp);
goto say_false;
}
if (S_ISSOCK(statbuf.st_mode))
stio->type = 's'; /* in case a socket was passed in to us */
#ifdef HAS_SOCKET
else if (
#ifdef S_IFMT
!(statbuf.st_mode & S_IFMT)
#else
!statbuf.st_mode
#endif
) {
int buflen = sizeof tokenbuf;
if (getsockname(fileno(fp), tokenbuf, &buflen) >= 0
|| errno != ENOTSOCK)
stio->type = 's'; /* some OS's return 0 on fstat()ed socket */
/* but some return 0 for streams too, sigh */
}
#endif
}
if (saveifp) { /* must use old fp? */
fd = fileno(saveifp);
if (saveofp) {
fflush(saveofp); /* emulate fclose() */
if (saveofp != saveifp) { /* was a socket? */
fclose(saveofp);
if (fd > 2)
Safefree(saveofp);
}
}
if (fd != fileno(fp)) {
int pid;
STR *TARG;
dup2(fileno(fp), fd);
TARG = afetch(fdpid,fileno(fp),TRUE);
pid = TARG->str_u.str_useful;
TARG->str_u.str_useful = 0;
TARG = afetch(fdpid,fd,TRUE);
TARG->str_u.str_useful = pid;
fclose(fp);
}
fp = saveifp;
clearerr(fp);
}
#if defined(HAS_FCNTL) && defined(F_SETFD)
fd = fileno(fp);
fcntl(fd,F_SETFD,fd > maxsysfd);
#endif
stio->ifp = fp;
if (writing) {
if (stio->type == 's'
|| (stio->type == '>' && S_ISCHR(statbuf.st_mode)) ) {
if (!(stio->ofp = fdopen(fileno(fp),"w"))) {
fclose(fp);
stio->ifp = Nullfp;
goto say_false;
}
}
else
stio->ofp = fp;
}
return TRUE;
say_false:
stio->ifp = saveifp;
stio->ofp = saveofp;
stio->type = savetype;
return FALSE;
}
|
