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pp_sys.c
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pp_sys.c
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/* pp_sys.c
*
* Copyright (c) 1991-1997, 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.
*
*/
/*
* But only a short way ahead its floor and the walls on either side were
* cloven by a great fissure, out of which the red glare came, now leaping
* up, now dying down into darkness; and all the while far below there was
* a rumour and a trouble as of great engines throbbing and labouring.
*/
#include "EXTERN.h"
#include "perl.h"
/* XXX If this causes problems, set i_unistd=undef in the hint file. */
#ifdef I_UNISTD
# include <unistd.h>
#endif
#ifdef I_SYS_WAIT
# include <sys/wait.h>
#endif
#ifdef I_SYS_RESOURCE
# include <sys/resource.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
#ifdef HAS_SELECT
#ifdef I_SYS_SELECT
#include <sys/select.h>
#endif
#endif
#ifdef HOST_NOT_FOUND
extern int h_errno;
#endif
#ifdef HAS_PASSWD
# ifdef I_PWD
# include <pwd.h>
# else
struct passwd *getpwnam _((char *));
struct passwd *getpwuid _((Uid_t));
# endif
struct passwd *getpwent _((void));
#endif
#ifdef HAS_GROUP
# ifdef I_GRP
# include <grp.h>
# else
struct group *getgrnam _((char *));
struct group *getgrgid _((Gid_t));
# endif
struct group *getgrent _((void));
#endif
#ifdef I_UTIME
# ifdef WIN32
# include <sys/utime.h>
# else
# include <utime.h>
# endif
#endif
#ifdef I_FCNTL
#include <fcntl.h>
#endif
#ifdef I_SYS_FILE
#include <sys/file.h>
#endif
/* Put this after #includes because fork and vfork prototypes may conflict. */
#ifndef HAS_VFORK
# define vfork fork
#endif
/* Put this after #includes because <unistd.h> defines _XOPEN_*. */
#ifndef Sock_size_t
# if _XOPEN_VERSION >= 5 || defined(_XOPEN_SOURCE_EXTENDED) || defined(__GLIBC__)
# define Sock_size_t Size_t
# else
# define Sock_size_t int
# endif
#endif
#if !defined(HAS_MKDIR) || !defined(HAS_RMDIR)
static int dooneliner _((char *cmd, char *filename));
#endif
#ifdef HAS_CHSIZE
# ifdef my_chsize /* Probably #defined to Perl_my_chsize in embed.h */
# undef my_chsize
# endif
# define my_chsize chsize
#endif
#ifdef HAS_FLOCK
# define FLOCK flock
#else /* no flock() */
/* fcntl.h might not have been included, even if it exists, because
the current Configure only sets I_FCNTL if it's needed to pick up
the *_OK constants. Make sure it has been included before testing
the fcntl() locking constants. */
# if defined(HAS_FCNTL) && !defined(I_FCNTL)
# include <fcntl.h>
# endif
# if defined(HAS_FCNTL) && defined(F_SETLK) && defined (F_SETLKW)
# define FLOCK fcntl_emulate_flock
# define FCNTL_EMULATE_FLOCK
# else /* no flock() or fcntl(F_SETLK,...) */
# ifdef HAS_LOCKF
# define FLOCK lockf_emulate_flock
# define LOCKF_EMULATE_FLOCK
# endif /* lockf */
# endif /* no flock() or fcntl(F_SETLK,...) */
# ifdef FLOCK
static int FLOCK _((int, int));
/*
* These are the flock() constants. Since this sytems doesn't have
* flock(), the values of the constants are probably not available.
*/
# ifndef LOCK_SH
# define LOCK_SH 1
# endif
# ifndef LOCK_EX
# define LOCK_EX 2
# endif
# ifndef LOCK_NB
# define LOCK_NB 4
# endif
# ifndef LOCK_UN
# define LOCK_UN 8
# endif
# endif /* emulating flock() */
#endif /* no flock() */
/* Pushy I/O. */
PP(pp_backtick)
{
dSP; dTARGET;
PerlIO *fp;
char *tmps = POPp;
I32 gimme = GIMME_V;
TAINT_PROPER("``");
fp = my_popen(tmps, "r");
if (fp) {
if (gimme == G_VOID) {
while (PerlIO_read(fp, buf, sizeof buf) > 0)
/*SUPPRESS 530*/
;
}
else if (gimme == G_SCALAR) {
sv_setpv(TARG, ""); /* note that this preserves previous buffer */
while (sv_gets(TARG, fp, SvCUR(TARG)) != Nullch)
/*SUPPRESS 530*/
;
XPUSHs(TARG);
SvTAINTED_on(TARG);
}
else {
SV *sv;
for (;;) {
sv = NEWSV(56, 80);
if (sv_gets(sv, fp, 0) == Nullch) {
SvREFCNT_dec(sv);
break;
}
XPUSHs(sv_2mortal(sv));
if (SvLEN(sv) - SvCUR(sv) > 20) {
SvLEN_set(sv, SvCUR(sv)+1);
Renew(SvPVX(sv), SvLEN(sv), char);
}
SvTAINTED_on(sv);
}
}
STATUS_NATIVE_SET(my_pclose(fp));
TAINT; /* "I believe that this is not gratuitous!" */
}
else {
STATUS_NATIVE_SET(-1);
if (gimme == G_SCALAR)
RETPUSHUNDEF;
}
RETURN;
}
PP(pp_glob)
{
OP *result;
ENTER;
SAVESPTR(last_in_gv); /* We don't want this to be permanent. */
last_in_gv = (GV*)*stack_sp--;
SAVESPTR(rs); /* This is not permanent, either. */
rs = sv_2mortal(newSVpv("", 1));
#ifndef DOSISH
#ifndef CSH
*SvPVX(rs) = '\n';
#endif /* !CSH */
#endif /* !DOSISH */
result = do_readline();
LEAVE;
return result;
}
PP(pp_indread)
{
last_in_gv = gv_fetchpv(SvPVx(GvSV((GV*)(*stack_sp--)), na), TRUE,SVt_PVIO);
return do_readline();
}
PP(pp_rcatline)
{
last_in_gv = cGVOP->op_gv;
return do_readline();
}
PP(pp_warn)
{
dSP; dMARK;
char *tmps;
if (SP - MARK != 1) {
dTARGET;
do_join(TARG, &sv_no, MARK, SP);
tmps = SvPV(TARG, na);
SP = MARK + 1;
}
else {
tmps = SvPV(TOPs, na);
}
if (!tmps || !*tmps) {
SV *error = GvSV(errgv);
(void)SvUPGRADE(error, SVt_PV);
if (SvPOK(error) && SvCUR(error))
sv_catpv(error, "\t...caught");
tmps = SvPV(error, na);
}
if (!tmps || !*tmps)
tmps = "Warning: something's wrong";
warn("%s", tmps);
RETSETYES;
}
PP(pp_die)
{
dSP; dMARK;
char *tmps;
if (SP - MARK != 1) {
dTARGET;
do_join(TARG, &sv_no, MARK, SP);
tmps = SvPV(TARG, na);
SP = MARK + 1;
}
else {
tmps = SvPV(TOPs, na);
}
if (!tmps || !*tmps) {
SV *error = GvSV(errgv);
(void)SvUPGRADE(error, SVt_PV);
if (SvPOK(error) && SvCUR(error))
sv_catpv(error, "\t...propagated");
tmps = SvPV(error, na);
}
if (!tmps || !*tmps)
tmps = "Died";
DIE("%s", tmps);
}
/* I/O. */
PP(pp_open)
{
dSP; dTARGET;
GV *gv;
SV *sv;
char *tmps;
STRLEN len;
if (MAXARG > 1)
sv = POPs;
if (!isGV(TOPs))
DIE(no_usym, "filehandle");
if (MAXARG <= 1)
sv = GvSV(TOPs);
gv = (GV*)POPs;
if (!isGV(gv))
DIE(no_usym, "filehandle");
if (GvIOp(gv))
IoFLAGS(GvIOp(gv)) &= ~IOf_UNTAINT;
tmps = SvPV(sv, len);
if (do_open(gv, tmps, len, FALSE, 0, 0, Nullfp))
PUSHi( (I32)forkprocess );
else if (forkprocess == 0) /* we are a new child */
PUSHi(0);
else
RETPUSHUNDEF;
RETURN;
}
PP(pp_close)
{
dSP;
GV *gv;
if (MAXARG == 0)
gv = defoutgv;
else
gv = (GV*)POPs;
EXTEND(SP, 1);
PUSHs(boolSV(do_close(gv, TRUE)));
RETURN;
}
PP(pp_pipe_op)
{
dSP;
#ifdef HAS_PIPE
GV *rgv;
GV *wgv;
register IO *rstio;
register IO *wstio;
int fd[2];
wgv = (GV*)POPs;
rgv = (GV*)POPs;
if (!rgv || !wgv)
goto badexit;
if (SvTYPE(rgv) != SVt_PVGV || SvTYPE(wgv) != SVt_PVGV)
DIE(no_usym, "filehandle");
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;
}
RETPUSHYES;
badexit:
RETPUSHUNDEF;
#else
DIE(no_func, "pipe");
#endif
}
PP(pp_fileno)
{
dSP; dTARGET;
GV *gv;
IO *io;
PerlIO *fp;
if (MAXARG < 1)
RETPUSHUNDEF;
gv = (GV*)POPs;
if (!gv || !(io = GvIO(gv)) || !(fp = IoIFP(io)))
RETPUSHUNDEF;
PUSHi(PerlIO_fileno(fp));
RETURN;
}
PP(pp_umask)
{
dSP; dTARGET;
int anum;
#ifdef HAS_UMASK
if (MAXARG < 1) {
anum = umask(0);
(void)umask(anum);
}
else
anum = umask(POPi);
TAINT_PROPER("umask");
XPUSHi(anum);
#else
DIE(no_func, "Unsupported function umask");
#endif
RETURN;
}
PP(pp_binmode)
{
dSP;
GV *gv;
IO *io;
PerlIO *fp;
if (MAXARG < 1)
RETPUSHUNDEF;
gv = (GV*)POPs;
EXTEND(SP, 1);
if (!(io = GvIO(gv)) || !(fp = IoIFP(io)))
RETPUSHUNDEF;
#ifdef DOSISH
#ifdef atarist
if (!PerlIO_flush(fp) && (fp->_flag |= _IOBIN))
RETPUSHYES;
else
RETPUSHUNDEF;
#else
if (setmode(PerlIO_fileno(fp), OP_BINARY) != -1)
RETPUSHYES;
else
RETPUSHUNDEF;
#endif
#else
#if defined(USEMYBINMODE)
if (my_binmode(fp,IoTYPE(io)) != NULL)
RETPUSHYES;
else
RETPUSHUNDEF;
#else
RETPUSHYES;
#endif
#endif
}
PP(pp_tie)
{
dSP;
SV *varsv;
HV* stash;
GV *gv;
BINOP myop;
SV *sv;
SV **mark = stack_base + ++*markstack_ptr; /* reuse in entersub */
I32 markoff = mark - stack_base - 1;
char *methname;
bool oldcatch = CATCH_GET;
varsv = mark[0];
if (SvTYPE(varsv) == SVt_PVHV)
methname = "TIEHASH";
else if (SvTYPE(varsv) == SVt_PVAV)
methname = "TIEARRAY";
else if (SvTYPE(varsv) == SVt_PVGV)
methname = "TIEHANDLE";
else
methname = "TIESCALAR";
stash = gv_stashsv(mark[1], FALSE);
if (!stash || !(gv = gv_fetchmethod(stash, methname)))
DIE("Can't locate object method \"%s\" via package \"%s\"",
methname, SvPV(mark[1],na));
Zero(&myop, 1, BINOP);
myop.op_last = (OP *) &myop;
myop.op_next = Nullop;
myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
CATCH_SET(TRUE);
ENTER;
SAVESPTR(op);
op = (OP *) &myop;
if (perldb && curstash != debstash)
op->op_private |= OPpENTERSUB_DB;
XPUSHs((SV*)GvCV(gv));
PUTBACK;
if (op = pp_entersub())
runops();
SPAGAIN;
CATCH_SET(oldcatch);
sv = TOPs;
if (sv_isobject(sv)) {
if (SvTYPE(varsv) == SVt_PVHV || SvTYPE(varsv) == SVt_PVAV) {
sv_unmagic(varsv, 'P');
sv_magic(varsv, sv, 'P', Nullch, 0);
}
else {
sv_unmagic(varsv, 'q');
sv_magic(varsv, sv, 'q', Nullch, 0);
}
}
LEAVE;
SP = stack_base + markoff;
PUSHs(sv);
RETURN;
}
PP(pp_untie)
{
dSP;
SV * sv ;
sv = POPs;
if (dowarn) {
MAGIC * mg ;
if (SvMAGICAL(sv)) {
if (SvTYPE(sv) == SVt_PVHV || SvTYPE(sv) == SVt_PVAV)
mg = mg_find(sv, 'P') ;
else
mg = mg_find(sv, 'q') ;
if (mg && SvREFCNT(SvRV(mg->mg_obj)) > 1)
warn("untie attempted while %lu inner references still exist",
(unsigned long)SvREFCNT(SvRV(mg->mg_obj)) - 1 ) ;
}
}
if (SvTYPE(sv) == SVt_PVHV || SvTYPE(sv) == SVt_PVAV)
sv_unmagic(sv, 'P');
else
sv_unmagic(sv, 'q');
RETPUSHYES;
}
PP(pp_tied)
{
dSP;
SV * sv ;
MAGIC * mg ;
sv = POPs;
if (SvMAGICAL(sv)) {
if (SvTYPE(sv) == SVt_PVHV || SvTYPE(sv) == SVt_PVAV)
mg = mg_find(sv, 'P') ;
else
mg = mg_find(sv, 'q') ;
if (mg) {
PUSHs(sv_2mortal(newSVsv(mg->mg_obj))) ;
RETURN ;
}
}
RETPUSHUNDEF;
}
PP(pp_dbmopen)
{
dSP;
HV *hv;
dPOPPOPssrl;
HV* stash;
GV *gv;
BINOP myop;
SV *sv;
bool oldcatch = CATCH_GET;
hv = (HV*)POPs;
sv = sv_mortalcopy(&sv_no);
sv_setpv(sv, "AnyDBM_File");
stash = gv_stashsv(sv, FALSE);
if (!stash || !(gv = gv_fetchmethod(stash, "TIEHASH"))) {
PUTBACK;
perl_require_pv("AnyDBM_File.pm");
SPAGAIN;
if (!(gv = gv_fetchmethod(stash, "TIEHASH")))
DIE("No dbm on this machine");
}
Zero(&myop, 1, BINOP);
myop.op_last = (OP *) &myop;
myop.op_next = Nullop;
myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
CATCH_SET(TRUE);
ENTER;
SAVESPTR(op);
op = (OP *) &myop;
if (perldb && curstash != debstash)
op->op_private |= OPpENTERSUB_DB;
PUTBACK;
pp_pushmark();
EXTEND(sp, 5);
PUSHs(sv);
PUSHs(left);
if (SvIV(right))
PUSHs(sv_2mortal(newSViv(O_RDWR|O_CREAT)));
else
PUSHs(sv_2mortal(newSViv(O_RDWR)));
PUSHs(right);
PUSHs((SV*)GvCV(gv));
PUTBACK;
if (op = pp_entersub())
runops();
SPAGAIN;
if (!sv_isobject(TOPs)) {
sp--;
op = (OP *) &myop;
PUTBACK;
pp_pushmark();
PUSHs(sv);
PUSHs(left);
PUSHs(sv_2mortal(newSViv(O_RDONLY)));
PUSHs(right);
PUSHs((SV*)GvCV(gv));
PUTBACK;
if (op = pp_entersub())
runops();
SPAGAIN;
}
CATCH_SET(oldcatch);
if (sv_isobject(TOPs))
sv_magic((SV*)hv, TOPs, 'P', Nullch, 0);
LEAVE;
RETURN;
}
PP(pp_dbmclose)
{
return pp_untie(ARGS);
}
PP(pp_sselect)
{
dSP; dTARGET;
#ifdef HAS_SELECT
register I32 i;
register I32 j;
register char *s;
register SV *sv;
double value;
I32 maxlen = 0;
I32 nfound;
struct timeval timebuf;
struct timeval *tbuf = &timebuf;
I32 growsize;
char *fd_sets[4];
#if BYTEORDER != 0x1234 && BYTEORDER != 0x12345678
I32 masksize;
I32 offset;
I32 k;
# if BYTEORDER & 0xf0000
# define ORDERBYTE (0x88888888 - BYTEORDER)
# else
# define ORDERBYTE (0x4444 - BYTEORDER)
# endif
#endif
SP -= 4;
for (i = 1; i <= 3; i++) {
if (!SvPOK(SP[i]))
continue;
j = SvCUR(SP[i]);
if (maxlen < j)
maxlen = j;
}
#if BYTEORDER == 0x1234 || BYTEORDER == 0x12345678
#if defined(__linux__) || defined(OS2)
growsize = sizeof(fd_set);
#else
growsize = maxlen; /* little endians can use vecs directly */
#endif
#else
#ifdef NFDBITS
#ifndef NBBY
#define NBBY 8
#endif
masksize = NFDBITS / NBBY;
#else
masksize = sizeof(long); /* documented int, everyone seems to use long */
#endif
growsize = maxlen + (masksize - (maxlen % masksize));
Zero(&fd_sets[0], 4, char*);
#endif
sv = SP[4];
if (SvOK(sv)) {
value = SvNV(sv);
if (value < 0.0)
value = 0.0;
timebuf.tv_sec = (long)value;
value -= (double)timebuf.tv_sec;
timebuf.tv_usec = (long)(value * 1000000.0);
}
else
tbuf = Null(struct timeval*);
for (i = 1; i <= 3; i++) {
sv = SP[i];
if (!SvOK(sv)) {
fd_sets[i] = 0;
continue;
}
else if (!SvPOK(sv))
SvPV_force(sv,na); /* force string conversion */
j = SvLEN(sv);
if (j < growsize) {
Sv_Grow(sv, growsize);
}
j = SvCUR(sv);
s = SvPVX(sv) + j;
while (++j <= growsize) {
*s++ = '\0';
}
#if BYTEORDER != 0x1234 && BYTEORDER != 0x12345678
s = SvPVX(sv);
New(403, fd_sets[i], growsize, char);
for (offset = 0; offset < growsize; offset += masksize) {
for (j = 0, k=ORDERBYTE; j < masksize; j++, (k >>= 4))
fd_sets[i][j+offset] = s[(k % masksize) + offset];
}
#else
fd_sets[i] = SvPVX(sv);
#endif
}
nfound = select(
maxlen * 8,
(Select_fd_set_t) fd_sets[1],
(Select_fd_set_t) fd_sets[2],
(Select_fd_set_t) fd_sets[3],
tbuf);
for (i = 1; i <= 3; i++) {
if (fd_sets[i]) {
sv = SP[i];
#if BYTEORDER != 0x1234 && BYTEORDER != 0x12345678
s = SvPVX(sv);
for (offset = 0; offset < growsize; offset += masksize) {
for (j = 0, k=ORDERBYTE; j < masksize; j++, (k >>= 4))
s[(k % masksize) + offset] = fd_sets[i][j+offset];
}
Safefree(fd_sets[i]);
#endif
SvSETMAGIC(sv);
}
}
PUSHi(nfound);
if (GIMME == G_ARRAY && tbuf) {
value = (double)(timebuf.tv_sec) +
(double)(timebuf.tv_usec) / 1000000.0;
PUSHs(sv = sv_mortalcopy(&sv_no));
sv_setnv(sv, value);
}
RETURN;
#else
DIE("select not implemented");
#endif
}
void
setdefout(gv)
GV *gv;
{
if (gv)
(void)SvREFCNT_inc(gv);
if (defoutgv)
SvREFCNT_dec(defoutgv);
defoutgv = gv;
}
PP(pp_select)
{
dSP; dTARGET;
GV *newdefout, *egv;
HV *hv;
newdefout = (op->op_private > 0) ? ((GV *) POPs) : NULL;
egv = GvEGV(defoutgv);
if (!egv)
egv = defoutgv;
hv = GvSTASH(egv);
if (! hv)
XPUSHs(&sv_undef);
else {
GV **gvp = (GV**)hv_fetch(hv, GvNAME(egv), GvNAMELEN(egv), FALSE);
if (gvp && *gvp == egv) {
gv_efullname3(TARG, defoutgv, Nullch);
XPUSHTARG;
}
else {
XPUSHs(sv_2mortal(newRV((SV*)egv)));
}
}
if (newdefout) {
if (!GvIO(newdefout))
gv_IOadd(newdefout);
setdefout(newdefout);
}
RETURN;
}
PP(pp_getc)
{
dSP; dTARGET;
GV *gv;
MAGIC *mg;
if (MAXARG <= 0)
gv = stdingv;
else
gv = (GV*)POPs;
if (!gv)
gv = argvgv;
if (SvMAGICAL(gv) && (mg = mg_find((SV*)gv, 'q'))) {
I32 gimme = GIMME_V;
PUSHMARK(SP);
XPUSHs(mg->mg_obj);
PUTBACK;
ENTER;
perl_call_method("GETC", gimme);
LEAVE;
SPAGAIN;
if (gimme == G_SCALAR)
SvSetMagicSV_nosteal(TARG, TOPs);
RETURN;
}
if (!gv || do_eof(gv)) /* make sure we have fp with something */
RETPUSHUNDEF;
TAINT;
sv_setpv(TARG, " ");
*SvPVX(TARG) = PerlIO_getc(IoIFP(GvIOp(gv))); /* should never be EOF */
PUSHTARG;
RETURN;
}
PP(pp_read)
{
return pp_sysread(ARGS);
}
static OP *
doform(cv,gv,retop)
CV *cv;
GV *gv;
OP *retop;
{
register CONTEXT *cx;
I32 gimme = GIMME_V;
AV* padlist = CvPADLIST(cv);
SV** svp = AvARRAY(padlist);
ENTER;
SAVETMPS;
push_return(retop);
PUSHBLOCK(cx, CXt_SUB, stack_sp);
PUSHFORMAT(cx);
SAVESPTR(curpad);
curpad = AvARRAY((AV*)svp[1]);
setdefout(gv); /* locally select filehandle so $% et al work */
return CvSTART(cv);
}
PP(pp_enterwrite)
{
dSP;
register GV *gv;
register IO *io;
GV *fgv;
CV *cv;
if (MAXARG == 0)
gv = defoutgv;
else {
gv = (GV*)POPs;
if (!gv)
gv = defoutgv;
}
EXTEND(SP, 1);
io = GvIO(gv);
if (!io) {
RETPUSHNO;
}
if (IoFMT_GV(io))
fgv = IoFMT_GV(io);
else
fgv = gv;
cv = GvFORM(fgv);
if (!cv) {
if (fgv) {
SV *tmpsv = sv_newmortal();
gv_efullname3(tmpsv, fgv, Nullch);
DIE("Undefined format \"%s\" called",SvPVX(tmpsv));
}
DIE("Not a format reference");
}
if (CvCLONE(cv))
cv = (CV*)sv_2mortal((SV*)cv_clone(cv));
IoFLAGS(io) &= ~IOf_DIDTOP;
return doform(cv,gv,op->op_next);
}
PP(pp_leavewrite)
{
dSP;
GV *gv = cxstack[cxstack_ix].blk_sub.gv;
register IO *io = GvIOp(gv);
PerlIO *ofp = IoOFP(io);
PerlIO *fp;
SV **newsp;
I32 gimme;
register CONTEXT *cx;
DEBUG_f(PerlIO_printf(Perl_debug_log, "left=%ld, todo=%ld\n",
(long)IoLINES_LEFT(io), (long)FmLINES(formtarget)));
if (IoLINES_LEFT(io) < FmLINES(formtarget) &&
formtarget != toptarget)
{
GV *fgv;
CV *cv;
if (!IoTOP_GV(io)) {
GV *topgv;
char tmpbuf[256];
if (!IoTOP_NAME(io)) {
if (!IoFMT_NAME(io))
IoFMT_NAME(io) = savepv(GvNAME(gv));
sprintf(tmpbuf, "%s_TOP", IoFMT_NAME(io));
topgv = gv_fetchpv(tmpbuf,FALSE, SVt_PVFM);
if ((topgv && GvFORM(topgv)) ||
!gv_fetchpv("top",FALSE,SVt_PVFM))
IoTOP_NAME(io) = savepv(tmpbuf);
else
IoTOP_NAME(io) = savepv("top");
}
topgv = gv_fetchpv(IoTOP_NAME(io),FALSE, SVt_PVFM);
if (!topgv || !GvFORM(topgv)) {
IoLINES_LEFT(io) = 100000000;
goto forget_top;
}
IoTOP_GV(io) = topgv;
}
if (IoFLAGS(io) & IOf_DIDTOP) { /* Oh dear. It still doesn't fit. */
I32 lines = IoLINES_LEFT(io);
char *s = SvPVX(formtarget);
if (lines <= 0) /* Yow, header didn't even fit!!! */
goto forget_top;
while (lines-- > 0) {
s = strchr(s, '\n');
if (!s)
break;
s++;