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doio.c
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doio.c
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/* doio.c
*
* Copyright (c) 1991-1994, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* "Far below them they saw the white waters pour into a foaming bowl, and
* then swirl darkly about a deep oval basin in the rocks, until they found
* their way out again through a narrow gate, and flowed away, fuming and
* chattering, into calmer and more level reaches."
*/
#include "EXTERN.h"
#include "perl.h"
#if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
#include <sys/ipc.h>
#ifdef HAS_MSG
#include <sys/msg.h>
#endif
#ifdef HAS_SEM
#include <sys/sem.h>
#endif
#ifdef HAS_SHM
#include <sys/shm.h>
# ifndef HAS_SHMAT_PROTOTYPE
extern Shmat_t shmat _((int, char *, int));
# endif
#endif
#endif
#ifdef I_UTIME
#include <utime.h>
#endif
#ifdef I_FCNTL
#include <fcntl.h>
#endif
#ifdef I_SYS_FILE
#include <sys/file.h>
#endif
#if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
#include <signal.h>
#endif
/* XXX If this causes problems, set i_unistd=undef in the hint file. */
#ifdef I_UNISTD
# include <unistd.h>
#endif
#if defined(HAS_SOCKET) && !defined(VMS) /* VMS handles sockets via vmsish.h */
# include <sys/socket.h>
# include <netdb.h>
# ifndef ENOTSOCK
# ifdef I_NET_ERRNO
# include <net/errno.h>
# endif
# endif
#endif
bool
do_open(gv,name,len,as_raw,rawmode,rawperm,supplied_fp)
GV *gv;
register char *name;
I32 len;
int as_raw;
int rawmode, rawperm;
PerlIO *supplied_fp;
{
register IO *io = GvIOn(gv);
PerlIO *saveifp = Nullfp;
PerlIO *saveofp = Nullfp;
char savetype = ' ';
int writing = 0;
PerlIO *fp;
int fd;
int result;
forkprocess = 1; /* assume true if no fork */
if (IoIFP(io)) {
fd = PerlIO_fileno(IoIFP(io));
if (IoTYPE(io) == '-')
result = 0;
else if (fd <= maxsysfd) {
saveifp = IoIFP(io);
saveofp = IoOFP(io);
savetype = IoTYPE(io);
result = 0;
}
else if (IoTYPE(io) == '|')
result = my_pclose(IoIFP(io));
else if (IoIFP(io) != IoOFP(io)) {
if (IoOFP(io)) {
result = PerlIO_close(IoOFP(io));
PerlIO_close(IoIFP(io)); /* clear stdio, fd already closed */
}
else
result = PerlIO_close(IoIFP(io));
}
else
result = PerlIO_close(IoIFP(io));
if (result == EOF && fd > maxsysfd)
PerlIO_printf(PerlIO_stderr(), "Warning: unable to close filehandle %s properly.\n",
GvENAME(gv));
IoOFP(io) = IoIFP(io) = Nullfp;
}
if (as_raw) {
result = rawmode & 3;
IoTYPE(io) = "<>++"[result];
writing = (result > 0);
fd = open(name, rawmode, rawperm);
if (fd == -1)
fp = NULL;
else {
char *fpmode;
if (result == 0)
fpmode = "r";
#ifdef O_APPEND
else if (rawmode & O_APPEND)
fpmode = (result == 1) ? "a" : "a+";
#endif
else
fpmode = (result == 1) ? "w" : "r+";
fp = PerlIO_fdopen(fd, fpmode);
if (!fp)
close(fd);
}
}
else {
char *myname;
char mode[3]; /* stdio file mode ("r\0" or "r+\0") */
int dodup;
myname = savepvn(name, len);
SAVEFREEPV(myname);
name = myname;
while (len && isSPACE(name[len-1]))
name[--len] = '\0';
mode[0] = mode[1] = mode[2] = '\0';
IoTYPE(io) = *name;
if (*name == '+' && len > 1 && name[len-1] != '|') { /* scary */
mode[1] = *name++;
--len;
writing = 1;
}
if (*name == '|') {
/*SUPPRESS 530*/
for (name++; isSPACE(*name); name++) ;
if (strNE(name,"-"))
TAINT_ENV();
TAINT_PROPER("piped open");
if (dowarn && name[strlen(name)-1] == '|')
warn("Can't do bidirectional pipe");
fp = my_popen(name,"w");
writing = 1;
}
else if (*name == '>') {
TAINT_PROPER("open");
name++;
if (*name == '>') {
mode[0] = IoTYPE(io) = 'a';
name++;
}
else
mode[0] = 'w';
writing = 1;
if (*name == '&') {
duplicity:
dodup = 1;
name++;
if (*name == '=') {
dodup = 0;
name++;
}
if (!*name && supplied_fp)
fp = supplied_fp;
else {
/*SUPPRESS 530*/
for (; isSPACE(*name); name++) ;
if (isDIGIT(*name))
fd = atoi(name);
else {
IO* thatio;
gv = gv_fetchpv(name,FALSE,SVt_PVIO);
thatio = GvIO(gv);
if (!thatio) {
#ifdef EINVAL
SETERRNO(EINVAL,SS$_IVCHAN);
#endif
goto say_false;
}
if (IoIFP(thatio)) {
fd = PerlIO_fileno(IoIFP(thatio));
if (IoTYPE(thatio) == 's')
IoTYPE(io) = 's';
}
else
fd = -1;
}
if (dodup)
fd = dup(fd);
if (!(fp = PerlIO_fdopen(fd,mode))) {
if (dodup)
close(fd);
}
}
}
else {
/*SUPPRESS 530*/
for (; isSPACE(*name); name++) ;
if (strEQ(name,"-")) {
fp = PerlIO_stdout();
IoTYPE(io) = '-';
}
else {
fp = PerlIO_open(name,mode);
}
}
}
else if (*name == '<') {
/*SUPPRESS 530*/
for (name++; isSPACE(*name); name++) ;
mode[0] = 'r';
if (*name == '&')
goto duplicity;
if (strEQ(name,"-")) {
fp = PerlIO_stdin();
IoTYPE(io) = '-';
}
else
fp = PerlIO_open(name,mode);
}
else if (name[len-1] == '|') {
name[--len] = '\0';
while (len && isSPACE(name[len-1]))
name[--len] = '\0';
/*SUPPRESS 530*/
for (; isSPACE(*name); name++) ;
if (strNE(name,"-"))
TAINT_ENV();
TAINT_PROPER("piped open");
fp = my_popen(name,"r");
IoTYPE(io) = '|';
}
else {
IoTYPE(io) = '<';
/*SUPPRESS 530*/
for (; isSPACE(*name); name++) ;
if (strEQ(name,"-")) {
fp = PerlIO_stdin();
IoTYPE(io) = '-';
}
else
fp = PerlIO_open(name,"r");
}
}
if (!fp) {
if (dowarn && IoTYPE(io) == '<' && strchr(name, '\n'))
warn(warn_nl, "open");
goto say_false;
}
if (IoTYPE(io) &&
IoTYPE(io) != '|' && IoTYPE(io) != '-') {
if (Fstat(PerlIO_fileno(fp),&statbuf) < 0) {
(void)PerlIO_close(fp);
goto say_false;
}
if (S_ISSOCK(statbuf.st_mode))
IoTYPE(io) = '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(PerlIO_fileno(fp), (struct sockaddr *)tokenbuf, &buflen) >= 0
|| errno != ENOTSOCK)
IoTYPE(io) = '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 = PerlIO_fileno(saveifp);
if (saveofp) {
PerlIO_flush(saveofp); /* emulate PerlIO_close() */
if (saveofp != saveifp) { /* was a socket? */
PerlIO_close(saveofp);
if (fd > 2)
Safefree(saveofp);
}
}
if (fd != PerlIO_fileno(fp)) {
int pid;
SV *sv;
dup2(PerlIO_fileno(fp), fd);
sv = *av_fetch(fdpid,PerlIO_fileno(fp),TRUE);
(void)SvUPGRADE(sv, SVt_IV);
pid = SvIVX(sv);
SvIVX(sv) = 0;
sv = *av_fetch(fdpid,fd,TRUE);
(void)SvUPGRADE(sv, SVt_IV);
SvIVX(sv) = pid;
PerlIO_close(fp);
}
fp = saveifp;
PerlIO_clearerr(fp);
}
#if defined(HAS_FCNTL) && defined(F_SETFD)
fd = PerlIO_fileno(fp);
fcntl(fd,F_SETFD,fd > maxsysfd);
#endif
IoIFP(io) = fp;
if (writing) {
if (IoTYPE(io) == 's'
|| (IoTYPE(io) == '>' && S_ISCHR(statbuf.st_mode)) ) {
if (!(IoOFP(io) = PerlIO_fdopen(PerlIO_fileno(fp),"w"))) {
PerlIO_close(fp);
IoIFP(io) = Nullfp;
goto say_false;
}
}
else
IoOFP(io) = fp;
}
return TRUE;
say_false:
IoIFP(io) = saveifp;
IoOFP(io) = saveofp;
IoTYPE(io) = savetype;
return FALSE;
}
PerlIO *
nextargv(gv)
register GV *gv;
{
register SV *sv;
#ifndef FLEXFILENAMES
int filedev;
int fileino;
#endif
int fileuid;
int filegid;
if (!argvoutgv)
argvoutgv = gv_fetchpv("ARGVOUT",TRUE,SVt_PVIO);
if (filemode & (S_ISUID|S_ISGID)) {
PerlIO_flush(IoIFP(GvIOn(argvoutgv))); /* chmod must follow last write */
#ifdef HAS_FCHMOD
(void)fchmod(lastfd,filemode);
#else
(void)chmod(oldname,filemode);
#endif
}
filemode = 0;
while (av_len(GvAV(gv)) >= 0) {
STRLEN len;
sv = av_shift(GvAV(gv));
SAVEFREESV(sv);
sv_setsv(GvSV(gv),sv);
SvSETMAGIC(GvSV(gv));
oldname = SvPVx(GvSV(gv), len);
if (do_open(gv,oldname,len,FALSE,0,0,Nullfp)) {
if (inplace) {
TAINT_PROPER("inplace open");
if (strEQ(oldname,"-")) {
setdefout(gv_fetchpv("STDOUT",TRUE,SVt_PVIO));
return IoIFP(GvIOp(gv));
}
#ifndef FLEXFILENAMES
filedev = statbuf.st_dev;
fileino = statbuf.st_ino;
#endif
filemode = statbuf.st_mode;
fileuid = statbuf.st_uid;
filegid = statbuf.st_gid;
if (!S_ISREG(filemode)) {
warn("Can't do inplace edit: %s is not a regular file",
oldname );
do_close(gv,FALSE);
continue;
}
if (*inplace) {
#ifdef SUFFIX
add_suffix(sv,inplace);
#else
sv_catpv(sv,inplace);
#endif
#ifndef FLEXFILENAMES
if (Stat(SvPVX(sv),&statbuf) >= 0
&& statbuf.st_dev == filedev
&& statbuf.st_ino == fileino ) {
warn("Can't do inplace edit: %s > 14 characters",
SvPVX(sv) );
do_close(gv,FALSE);
continue;
}
#endif
#ifdef HAS_RENAME
#ifndef DOSISH
if (rename(oldname,SvPVX(sv)) < 0) {
warn("Can't rename %s to %s: %s, skipping file",
oldname, SvPVX(sv), Strerror(errno) );
do_close(gv,FALSE);
continue;
}
#else
do_close(gv,FALSE);
(void)unlink(SvPVX(sv));
(void)rename(oldname,SvPVX(sv));
do_open(gv,SvPVX(sv),SvCUR(sv),FALSE,0,0,Nullfp);
#endif /* DOSISH */
#else
(void)UNLINK(SvPVX(sv));
if (link(oldname,SvPVX(sv)) < 0) {
warn("Can't rename %s to %s: %s, skipping file",
oldname, SvPVX(sv), Strerror(errno) );
do_close(gv,FALSE);
continue;
}
(void)UNLINK(oldname);
#endif
}
else {
#if !defined(DOSISH) && !defined(AMIGAOS)
# ifndef VMS /* Don't delete; use automatic file versioning */
if (UNLINK(oldname) < 0) {
warn("Can't rename %s to %s: %s, skipping file",
oldname, SvPVX(sv), Strerror(errno) );
do_close(gv,FALSE);
continue;
}
# endif
#else
croak("Can't do inplace edit without backup");
#endif
}
sv_setpvn(sv,">",1);
sv_catpv(sv,oldname);
SETERRNO(0,0); /* in case sprintf set errno */
if (!do_open(argvoutgv,SvPVX(sv),SvCUR(sv),FALSE,0,0,Nullfp)) {
warn("Can't do inplace edit on %s: %s",
oldname, Strerror(errno) );
do_close(gv,FALSE);
continue;
}
setdefout(argvoutgv);
lastfd = PerlIO_fileno(IoIFP(GvIOp(argvoutgv)));
(void)Fstat(lastfd,&statbuf);
#ifdef HAS_FCHMOD
(void)fchmod(lastfd,filemode);
#else
(void)chmod(oldname,filemode);
#endif
if (fileuid != statbuf.st_uid || filegid != statbuf.st_gid) {
#ifdef HAS_FCHOWN
(void)fchown(lastfd,fileuid,filegid);
#else
#ifdef HAS_CHOWN
(void)chown(oldname,fileuid,filegid);
#endif
#endif
}
}
return IoIFP(GvIOp(gv));
}
else
PerlIO_printf(PerlIO_stderr(), "Can't open %s: %s\n",SvPV(sv, na), Strerror(errno));
}
if (inplace) {
(void)do_close(argvoutgv,FALSE);
setdefout(gv_fetchpv("STDOUT",TRUE,SVt_PVIO));
}
return Nullfp;
}
#ifdef HAS_PIPE
void
do_pipe(sv, rgv, wgv)
SV *sv;
GV *rgv;
GV *wgv;
{
register IO *rstio;
register IO *wstio;
int fd[2];
if (!rgv)
goto badexit;
if (!wgv)
goto badexit;
rstio = GvIOn(rgv);
wstio = GvIOn(wgv);
if (IoIFP(rstio))
do_close(rgv,FALSE);
if (IoIFP(wstio))
do_close(wgv,FALSE);
if (pipe(fd) < 0)
goto badexit;
IoIFP(rstio) = PerlIO_fdopen(fd[0], "r");
IoOFP(wstio) = PerlIO_fdopen(fd[1], "w");
IoIFP(wstio) = IoOFP(wstio);
IoTYPE(rstio) = '<';
IoTYPE(wstio) = '>';
if (!IoIFP(rstio) || !IoOFP(wstio)) {
if (IoIFP(rstio)) PerlIO_close(IoIFP(rstio));
else close(fd[0]);
if (IoOFP(wstio)) PerlIO_close(IoOFP(wstio));
else close(fd[1]);
goto badexit;
}
sv_setsv(sv,&sv_yes);
return;
badexit:
sv_setsv(sv,&sv_undef);
return;
}
#endif
/* explicit renamed to avoid C++ conflict -- kja */
bool
#ifndef CAN_PROTOTYPE
do_close(gv,not_implicit)
GV *gv;
bool not_implicit;
#else
do_close(GV *gv, bool not_implicit)
#endif /* CAN_PROTOTYPE */
{
bool retval;
IO *io;
if (!gv)
gv = argvgv;
if (!gv || SvTYPE(gv) != SVt_PVGV) {
SETERRNO(EBADF,SS$_IVCHAN);
return FALSE;
}
io = GvIO(gv);
if (!io) { /* never opened */
if (dowarn && not_implicit)
warn("Close on unopened file <%s>",GvENAME(gv));
return FALSE;
}
retval = io_close(io);
if (not_implicit) {
IoLINES(io) = 0;
IoPAGE(io) = 0;
IoLINES_LEFT(io) = IoPAGE_LEN(io);
}
IoTYPE(io) = ' ';
return retval;
}
bool
io_close(io)
IO* io;
{
bool retval = FALSE;
int status;
if (IoIFP(io)) {
if (IoTYPE(io) == '|') {
status = my_pclose(IoIFP(io));
STATUS_NATIVE_SET(status);
retval = (STATUS_POSIX == 0);
}
else if (IoTYPE(io) == '-')
retval = TRUE;
else {
if (IoOFP(io) && IoOFP(io) != IoIFP(io)) { /* a socket */
retval = (PerlIO_close(IoOFP(io)) != EOF);
PerlIO_close(IoIFP(io)); /* clear stdio, fd already closed */
}
else
retval = (PerlIO_close(IoIFP(io)) != EOF);
}
IoOFP(io) = IoIFP(io) = Nullfp;
}
return retval;
}
bool
do_eof(gv)
GV *gv;
{
register IO *io;
int ch;
io = GvIO(gv);
if (!io)
return TRUE;
while (IoIFP(io)) {
if (PerlIO_has_cntptr(IoIFP(io))) { /* (the code works without this) */
if (PerlIO_get_cnt(IoIFP(io)) > 0) /* cheat a little, since */
return FALSE; /* this is the most usual case */
}
ch = PerlIO_getc(IoIFP(io));
if (ch != EOF) {
(void)PerlIO_ungetc(IoIFP(io),ch);
return FALSE;
}
if (PerlIO_has_cntptr(IoIFP(io)) && PerlIO_canset_cnt(IoIFP(io))) {
if (PerlIO_get_cnt(IoIFP(io)) < -1)
PerlIO_set_cnt(IoIFP(io),-1);
}
if (op->op_flags & OPf_SPECIAL) { /* not necessarily a real EOF yet? */
if (!nextargv(argvgv)) /* get another fp handy */
return TRUE;
}
else
return TRUE; /* normal fp, definitely end of file */
}
return TRUE;
}
long
do_tell(gv)
GV *gv;
{
register IO *io;
if (!gv)
goto phooey;
io = GvIO(gv);
if (!io || !IoIFP(io))
goto phooey;
#ifdef ULTRIX_STDIO_BOTCH
if (PerlIO_eof(IoIFP(io)))
(void)PerlIO_seek (IoIFP(io), 0L, 2); /* ultrix 1.2 workaround */
#endif
return PerlIO_tell(IoIFP(io));
phooey:
if (dowarn)
warn("tell() on unopened file");
SETERRNO(EBADF,RMS$_IFI);
return -1L;
}
bool
do_seek(gv, pos, whence)
GV *gv;
long pos;
int whence;
{
register IO *io;
if (!gv)
goto nuts;
io = GvIO(gv);
if (!io || !IoIFP(io))
goto nuts;
#ifdef ULTRIX_STDIO_BOTCH
if (PerlIO_eof(IoIFP(io)))
(void)PerlIO_seek (IoIFP(io), 0L, 2); /* ultrix 1.2 workaround */
#endif
return PerlIO_seek(IoIFP(io), pos, whence) >= 0;
nuts:
if (dowarn)
warn("seek() on unopened file");
SETERRNO(EBADF,RMS$_IFI);
return FALSE;
}
#if !defined(HAS_TRUNCATE) && !defined(HAS_CHSIZE) && defined(F_FREESP)
/* code courtesy of William Kucharski */
#define HAS_CHSIZE
I32 my_chsize(fd, length)
I32 fd; /* file descriptor */
Off_t length; /* length to set file to */
{
extern long lseek();
struct flock fl;
struct stat filebuf;
if (Fstat(fd, &filebuf) < 0)
return -1;
if (filebuf.st_size < length) {
/* extend file length */
if ((lseek(fd, (length - 1), 0)) < 0)
return -1;
/* write a "0" byte */
if ((write(fd, "", 1)) != 1)
return -1;
}
else {
/* truncate length */
fl.l_whence = 0;
fl.l_len = 0;
fl.l_start = length;
fl.l_type = F_WRLCK; /* write lock on file space */
/*
* This relies on the UNDOCUMENTED F_FREESP argument to
* fcntl(2), which truncates the file so that it ends at the
* position indicated by fl.l_start.
*
* Will minor miracles never cease?
*/
if (fcntl(fd, F_FREESP, &fl) < 0)
return -1;
}
return 0;
}
#endif /* F_FREESP */
bool
do_print(sv,fp)
register SV *sv;
PerlIO *fp;
{
register char *tmps;
STRLEN len;
/* assuming fp is checked earlier */
if (!sv)
return TRUE;
if (ofmt) {
if (SvGMAGICAL(sv))
mg_get(sv);
if (SvIOK(sv) && SvIVX(sv) != 0) {
PerlIO_printf(fp, ofmt, (double)SvIVX(sv));
return !PerlIO_error(fp);
}
if ( (SvNOK(sv) && SvNVX(sv) != 0.0)
|| (looks_like_number(sv) && sv_2nv(sv) != 0.0) ) {
PerlIO_printf(fp, ofmt, SvNVX(sv));
return !PerlIO_error(fp);
}
}
switch (SvTYPE(sv)) {
case SVt_NULL:
if (dowarn)
warn(warn_uninit);
return TRUE;
case SVt_IV:
if (SvIOK(sv)) {
if (SvGMAGICAL(sv))
mg_get(sv);
PerlIO_printf(fp, "%ld", (long)SvIVX(sv));
return !PerlIO_error(fp);
}
/* FALL THROUGH */
default:
tmps = SvPV(sv, len);
break;
}
if (len && (PerlIO_write(fp,tmps,len) == 0 || PerlIO_error(fp)))
return FALSE;
return !PerlIO_error(fp);
}
I32
my_stat(ARGS)
dARGS
{
dSP;
IO *io;
GV* tmpgv;
if (op->op_flags & OPf_REF) {
EXTEND(sp,1);
tmpgv = cGVOP->op_gv;
do_fstat:
io = GvIO(tmpgv);
if (io && IoIFP(io)) {
statgv = tmpgv;
sv_setpv(statname,"");
laststype = OP_STAT;
return (laststatval = Fstat(PerlIO_fileno(IoIFP(io)), &statcache));
}
else {
if (tmpgv == defgv)
return laststatval;
if (dowarn)
warn("Stat on unopened file <%s>",
GvENAME(tmpgv));
statgv = Nullgv;
sv_setpv(statname,"");
return (laststatval = -1);
}
}
else {
SV* sv = POPs;
PUTBACK;
if (SvTYPE(sv) == SVt_PVGV) {
tmpgv = (GV*)sv;
goto do_fstat;
}
else if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVGV) {
tmpgv = (GV*)SvRV(sv);
goto do_fstat;
}
statgv = Nullgv;
sv_setpv(statname,SvPV(sv, na));
laststype = OP_STAT;
laststatval = Stat(SvPV(sv, na),&statcache);
if (laststatval < 0 && dowarn && strchr(SvPV(sv, na), '\n'))
warn(warn_nl, "stat");
return laststatval;
}
}
I32
my_lstat(ARGS)
dARGS
{
dSP;
SV *sv;
if (op->op_flags & OPf_REF) {
EXTEND(sp,1);
if (cGVOP->op_gv == defgv) {
if (laststype != OP_LSTAT)
croak("The stat preceding -l _ wasn't an lstat");
return laststatval;
}
croak("You can't use -l on a filehandle");
}
laststype = OP_LSTAT;
statgv = Nullgv;
sv = POPs;
PUTBACK;
sv_setpv(statname,SvPV(sv, na));
#ifdef HAS_LSTAT
laststatval = lstat(SvPV(sv, na),&statcache);
#else
laststatval = Stat(SvPV(sv, na),&statcache);
#endif
if (laststatval < 0 && dowarn && strchr(SvPV(sv, na), '\n'))
warn(warn_nl, "lstat");
return laststatval;
}
bool
do_aexec(really,mark,sp)
SV *really;
register SV **mark;
register SV **sp;
{
register char **a;
char *tmps;
if (sp > mark) {
New(401,Argv, sp - mark + 1, char*);
a = Argv;
while (++mark <= sp) {
if (*mark)
*a++ = SvPVx(*mark, na);
else
*a++ = "";
}
*a = Nullch;
if (*Argv[0] != '/') /* will execvp use PATH? */
TAINT_ENV(); /* testing IFS here is overkill, probably */
if (really && *(tmps = SvPV(really, na)))
execvp(tmps,Argv);
else
execvp(Argv[0],Argv);
if (dowarn)
warn("Can't exec \"%s\": %s", Argv[0], Strerror(errno));
}
do_execfree();
return FALSE;
}
void
do_execfree()
{
if (Argv) {
Safefree(Argv);
Argv = Null(char **);
}
if (Cmd) {
Safefree(Cmd);
Cmd = Nullch;
}
}
#ifndef OS2
bool
do_exec(cmd)
char *cmd;
{
register char **a;
register char *s;
char flags[10];
while (*cmd && isSPACE(*cmd))
cmd++;
/* save an extra exec if possible */
#ifdef CSH
if (strnEQ(cmd,cshname,cshlen) && strnEQ(cmd+cshlen," -c",3)) {
strcpy(flags,"-c");
s = cmd+cshlen+3;
if (*s == 'f') {
s++;
strcat(flags,"f");
}
if (*s == ' ')
s++;
if (*s++ == '\'') {
char *ncmd = s;
while (*s)
s++;
if (s[-1] == '\n')
*--s = '\0';
if (s[-1] == '\'') {
*--s = '\0';
execl(cshname,"csh", flags,ncmd,(char*)0);
*s = '\'';
return FALSE;
}
}
}
#endif /* CSH */
/* see if there are shell metacharacters in it */
if (*cmd == '.' && isSPACE(cmd[1]))
goto doshell;
if (strnEQ(cmd,"exec",4) && isSPACE(cmd[4]))
goto doshell;
for (s = cmd; *s && isALPHA(*s); s++) ; /* catch VAR=val gizmo */
if (*s == '=')
goto doshell;
for (s = cmd; *s; s++) {
if (*s != ' ' && !isALPHA(*s) && strchr("$&*(){}[]'\";\\|?<>~`\n",*s)) {
if (*s == '\n' && !s[1]) {
*s = '\0';
break;
}
doshell:
execl(sh_path, "sh", "-c", cmd, (char*)0);
return FALSE;
}
}
New(402,Argv, (s - cmd) / 2 + 2, char*);
Cmd = savepvn(cmd, s-cmd);
a = Argv;
for (s = Cmd; *s;) {
while (*s && isSPACE(*s)) s++;
if (*s)
*(a++) = s;
while (*s && !isSPACE(*s)) s++;
if (*s)