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perlio.c
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/*
* perlio.c
* Copyright (c) 1996-2006, Nick Ing-Simmons
* Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011 Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public License
* or the Artistic License, as specified in the README file.
*/
/*
* Hour after hour for nearly three weary days he had jogged up and down,
* over passes, and through long dales, and across many streams.
*
* [pp.791-792 of _The Lord of the Rings_, V/iii: "The Muster of Rohan"]
*/
/* This file contains the functions needed to implement PerlIO, which
* is Perl's private replacement for the C stdio library. This is used
* by default unless you compile with -Uuseperlio or run with
* PERLIO=:stdio (but don't do this unless you know what you're doing)
*/
/*
* If we have ActivePerl-like PERL_IMPLICIT_SYS then we need a dTHX to get
* at the dispatch tables, even when we do not need it for other reasons.
* Invent a dSYS macro to abstract this out
*/
#ifdef PERL_IMPLICIT_SYS
# define dSYS dTHX
#else
# define dSYS dNOOP
#endif
#define PERLIO_NOT_STDIO 0
/*
* This file provides those parts of PerlIO abstraction
* which are not #defined in perlio.h.
* Which these are depends on various Configure #ifdef's
*/
#include "EXTERN.h"
#define PERL_IN_PERLIO_C
#include "perl.h"
#ifdef MULTIPLICITY
# undef dSYS
# define dSYS dTHX
#endif
#include "XSUB.h"
#ifdef VMS
# include <rms.h>
#endif
#define PerlIO_lockcnt(f) (((PerlIOl*)(void*)(f))->head->flags)
/* Call the callback or PerlIOBase, and return failure. */
#define Perl_PerlIO_or_Base(f, callback, base, failure, args) \
if (PerlIOValid(f)) { \
const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
if (tab && tab->callback) \
return (*tab->callback) args; \
else \
return PerlIOBase_ ## base args; \
} \
else \
SETERRNO(EBADF, SS_IVCHAN); \
return failure
/* Call the callback or fail, and return failure. */
#define Perl_PerlIO_or_fail(f, callback, failure, args) \
if (PerlIOValid(f)) { \
const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
if (tab && tab->callback) \
return (*tab->callback) args; \
SETERRNO(EINVAL, LIB_INVARG); \
} \
else \
SETERRNO(EBADF, SS_IVCHAN); \
return failure
/* Call the callback or PerlIOBase, and be void. */
#define Perl_PerlIO_or_Base_void(f, callback, base, args) \
if (PerlIOValid(f)) { \
const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
if (tab && tab->callback) \
(*tab->callback) args; \
else \
PerlIOBase_ ## base args; \
} \
else \
SETERRNO(EBADF, SS_IVCHAN)
/* Call the callback or fail, and be void. */
#define Perl_PerlIO_or_fail_void(f, callback, args) \
if (PerlIOValid(f)) { \
const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
if (tab && tab->callback) \
(*tab->callback) args; \
else \
SETERRNO(EINVAL, LIB_INVARG); \
} \
else \
SETERRNO(EBADF, SS_IVCHAN)
#if defined(__osf__) && _XOPEN_SOURCE < 500
extern int fseeko(FILE *, off_t, int);
extern off_t ftello(FILE *);
#endif
#define NATIVE_0xd CR_NATIVE
#define NATIVE_0xa LF_NATIVE
EXTERN_C int perlsio_binmode(FILE *fp, int iotype, int mode);
int
perlsio_binmode(FILE *fp, int iotype, int mode)
{
/*
* This used to be contents of do_binmode in doio.c
*/
#ifdef DOSISH
dTHX;
PERL_UNUSED_ARG(iotype);
if (PerlLIO_setmode(fileno(fp), mode) != -1) {
return 1;
}
else
return 0;
#else
# if defined(USEMYBINMODE)
dTHX;
# if defined(__CYGWIN__)
PERL_UNUSED_ARG(iotype);
# endif
if (my_binmode(fp, iotype, mode) != FALSE)
return 1;
else
return 0;
# else
PERL_UNUSED_ARG(fp);
PERL_UNUSED_ARG(iotype);
PERL_UNUSED_ARG(mode);
return 1;
# endif
#endif
}
#ifndef O_ACCMODE
# define O_ACCMODE 3 /* Assume traditional implementation */
#endif
int
PerlIO_intmode2str(int rawmode, char *mode, int *writing)
{
const int result = rawmode & O_ACCMODE;
int ix = 0;
int ptype;
switch (result) {
case O_RDONLY:
ptype = IoTYPE_RDONLY;
break;
case O_WRONLY:
ptype = IoTYPE_WRONLY;
break;
case O_RDWR:
default:
ptype = IoTYPE_RDWR;
break;
}
if (writing)
*writing = (result != O_RDONLY);
if (result == O_RDONLY) {
mode[ix++] = 'r';
}
#ifdef O_APPEND
else if (rawmode & O_APPEND) {
mode[ix++] = 'a';
if (result != O_WRONLY)
mode[ix++] = '+';
}
#endif
else {
if (result == O_WRONLY)
mode[ix++] = 'w';
else {
mode[ix++] = 'r';
mode[ix++] = '+';
}
}
#if O_BINARY != 0
/* Unless O_BINARY is different from zero, bit-and:ing
* with it won't do much good. */
if (rawmode & O_BINARY)
mode[ix++] = 'b';
#endif
mode[ix] = '\0';
return ptype;
}
#ifndef PERLIO_LAYERS
int
PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
{
if (!names || !*names
|| strEQ(names, ":crlf")
|| strEQ(names, ":raw")
|| strEQ(names, ":bytes")
) {
return 0;
}
croak("Cannot apply \"%s\" in non-PerlIO perl", names);
/*
* NOTREACHED
*/
return -1;
}
void
PerlIO_destruct(pTHX)
{
}
int
PerlIO_binmode(pTHX_ PerlIO *fp, int iotype, int mode, const char *names)
{
return perlsio_binmode(fp, iotype, mode);
}
PerlIO *
PerlIO_fdupopen(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
{
#if defined(PERL_IMPLICIT_SYS)
return PerlSIO_fdupopen(f);
#else
# ifdef WIN32
return win32_fdupopen(f);
# else
if (f) {
const int fd = PerlLIO_dup_cloexec(PerlIO_fileno(f));
if (fd >= 0) {
char mode[8];
const int omode = fcntl(fd, F_GETFL);
PerlIO_intmode2str(omode,mode,NULL);
/* the r+ is a hack */
return PerlIO_fdopen(fd, mode);
}
return NULL;
}
else {
SETERRNO(EBADF, SS_IVCHAN);
}
# endif
return NULL;
#endif
}
/*
* De-mux PerlIO_openn() into fdopen, freopen and fopen type entries
*/
PerlIO *
PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd,
int imode, int perm, PerlIO *old, int narg, SV **args)
{
if (narg) {
if (narg > 1) {
croak("More than one argument to open");
}
if (*args == &PL_sv_undef)
return PerlIO_tmpfile();
else {
STRLEN len;
const char *name = SvPV_const(*args, len);
if (!IS_SAFE_PATHNAME(name, len, "open"))
return NULL;
if (*mode == IoTYPE_NUMERIC) {
fd = PerlLIO_open3_cloexec(name, imode, perm);
if (fd >= 0)
return PerlIO_fdopen(fd, mode + 1);
}
else if (old) {
return PerlIO_reopen(name, mode, old);
}
else {
return PerlIO_open(name, mode);
}
}
}
else {
return PerlIO_fdopen(fd, mode);
}
return NULL;
}
XS(XS_PerlIO__Layer__find); /* prototype to pass -Wmissing-prototypes */
XS(XS_PerlIO__Layer__find)
{
dXSARGS;
if (items < 2)
croak("Usage class->find(name[,load])");
else {
const char * const name = SvPV_nolen_const(ST(1));
ST(0) = (strEQ(name, "crlf")
|| strEQ(name, "raw")) ? &PL_sv_yes : &PL_sv_undef;
XSRETURN(1);
}
}
void
Perl_boot_core_PerlIO(pTHX)
{
newXS("PerlIO::Layer::find", XS_PerlIO__Layer__find, __FILE__);
}
#endif
/*======================================================================================*/
/*
* Implement all the PerlIO interface ourselves.
*/
#include "perliol.h"
void
PerlIO_debug(const char *fmt, ...)
{
va_list ap;
dSYS;
if (!DEBUG_i_TEST)
return;
va_start(ap, fmt);
if (!PL_perlio_debug_fd) {
if (!TAINTING_get &&
PerlProc_getuid() == PerlProc_geteuid() &&
PerlProc_getgid() == PerlProc_getegid()) {
const char * const s = PerlEnv_getenv("PERLIO_DEBUG");
if (s && *s)
PL_perlio_debug_fd = PerlLIO_open3_cloexec(s,
O_WRONLY | O_CREAT | O_APPEND, 0666);
else
PL_perlio_debug_fd = PerlLIO_dup_cloexec(2); /* stderr */
} else {
/* tainting or set*id, so ignore the environment and send the
debug output to stderr, like other -D switches. */
PL_perlio_debug_fd = PerlLIO_dup_cloexec(2); /* stderr */
}
}
if (PL_perlio_debug_fd > 0) {
#ifdef USE_ITHREADS
const char * const s = CopFILE(PL_curcop);
/* Use fixed buffer as sv_catpvf etc. needs SVs */
char buffer[1024];
const STRLEN len1 = my_snprintf(buffer, sizeof(buffer), "%.40s:%" LINE_Tf " ", s ? s : "(none)", CopLINE(PL_curcop));
# ifdef USE_QUADMATH
# ifdef HAS_VSNPRINTF
/* my_vsnprintf() isn't available with quadmath, but the native vsnprintf()
should be, otherwise the system isn't likely to support quadmath.
Nothing should be calling PerlIO_debug() with floating point anyway.
*/
DECLARATION_FOR_LC_NUMERIC_MANIPULATION;
STORE_LC_NUMERIC_SET_TO_NEEDED();
const STRLEN len2 = vsnprintf(buffer + len1, sizeof(buffer) - len1, fmt, ap);
RESTORE_LC_NUMERIC();
# else
STATIC_ASSERT_STMT(0);
# endif
# else
const STRLEN len2 = my_vsnprintf(buffer + len1, sizeof(buffer) - len1, fmt, ap);
# endif
PERL_UNUSED_RESULT(PerlLIO_write(PL_perlio_debug_fd, buffer, len1 + len2));
#else
const char *s = CopFILE(PL_curcop);
STRLEN len;
SV * const sv = Perl_newSVpvf(aTHX_ "%s:%" LINE_Tf " ",
s ? s : "(none)", CopLINE(PL_curcop));
Perl_sv_vcatpvf(aTHX_ sv, fmt, &ap);
s = SvPV_const(sv, len);
PERL_UNUSED_RESULT(PerlLIO_write(PL_perlio_debug_fd, s, len));
SvREFCNT_dec(sv);
#endif
}
va_end(ap);
}
/*--------------------------------------------------------------------------------------*/
/*
* Inner level routines
*/
/* check that the head field of each layer points back to the head */
#ifdef DEBUGGING
# define VERIFY_HEAD(f) PerlIO_verify_head(aTHX_ f)
static void
PerlIO_verify_head(pTHX_ PerlIO *f)
{
PerlIOl *head, *p;
int seen = 0;
# ifndef PERL_IMPLICIT_SYS
PERL_UNUSED_CONTEXT;
# endif
if (!PerlIOValid(f))
return;
p = head = PerlIOBase(f)->head;
assert(p);
do {
assert(p->head == head);
if (&p->next == f)
seen = 1;
p = p->next;
} while (p);
assert(seen);
}
#else
# define VERIFY_HEAD(f)
#endif
/*
* Table of pointers to the PerlIO structs (malloc'ed)
*/
#define PERLIO_TABLE_SIZE 64
static void
PerlIO_init_table(pTHX)
{
if (PL_perlio)
return;
Newxz(PL_perlio, PERLIO_TABLE_SIZE, PerlIOl);
}
PerlIO *
PerlIO_allocate(pTHX)
{
/*
* Find a free slot in the table, allocating new tables as necessary
*/
PerlIOl **last;
PerlIOl *f;
last = &PL_perlio;
while ((f = *last)) {
int i;
last = &f->next;
for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
if (!((++f)->next)) {
goto good_exit;
}
}
}
Newxz(f,PERLIO_TABLE_SIZE,PerlIOl);
if (!f) {
return NULL;
}
*last = f++;
good_exit:
f->flags = 0; /* lockcnt */
f->tab = NULL;
f->head = f;
return &f->next;
}
#undef PerlIO_fdupopen
PerlIO *
PerlIO_fdupopen(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
{
if (PerlIOValid(f)) {
const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
DEBUG_i( PerlIO_debug("fdupopen f=%p param=%p\n",(void*)f,(void*)param) );
if (tab && tab->Dup)
return (*tab->Dup)(aTHX_ PerlIO_allocate(aTHX), f, param, flags);
else {
return PerlIOBase_dup(aTHX_ PerlIO_allocate(aTHX), f, param, flags);
}
}
else
SETERRNO(EBADF, SS_IVCHAN);
return NULL;
}
void
PerlIO_cleantable(pTHX_ PerlIOl **tablep)
{
PerlIOl * const table = *tablep;
if (table) {
int i;
PerlIO_cleantable(aTHX_ &table[0].next);
for (i = PERLIO_TABLE_SIZE - 1; i > 0; i--) {
PerlIOl * const f = table + i;
if (f->next) {
PerlIO_close(&(f->next));
}
}
Safefree(table);
*tablep = NULL;
}
}
PerlIO_list_t *
PerlIO_list_alloc(pTHX)
{
PerlIO_list_t *list;
PERL_UNUSED_CONTEXT;
Newxz(list, 1, PerlIO_list_t);
list->refcnt = 1;
return list;
}
void
PerlIO_list_free(pTHX_ PerlIO_list_t *list)
{
if (list) {
if (--list->refcnt == 0) {
if (list->array) {
IV i;
for (i = 0; i < list->cur; i++)
SvREFCNT_dec(list->array[i].arg);
Safefree(list->array);
}
Safefree(list);
}
}
}
void
PerlIO_list_push(pTHX_ PerlIO_list_t *list, PerlIO_funcs *funcs, SV *arg)
{
PerlIO_pair_t *p;
PERL_UNUSED_CONTEXT;
if (list->cur >= list->len) {
const IV new_len = list->len + 8;
if (list->array)
Renew(list->array, new_len, PerlIO_pair_t);
else
Newx(list->array, new_len, PerlIO_pair_t);
list->len = new_len;
}
p = &(list->array[list->cur++]);
p->funcs = funcs;
if ((p->arg = arg)) {
SvREFCNT_inc_simple_void_NN(arg);
}
}
PerlIO_list_t *
PerlIO_clone_list(pTHX_ PerlIO_list_t *proto, CLONE_PARAMS *param)
{
PerlIO_list_t *list = NULL;
if (proto) {
int i;
list = PerlIO_list_alloc(aTHX);
for (i=0; i < proto->cur; i++) {
SV *arg = proto->array[i].arg;
#ifdef USE_ITHREADS
if (arg && param)
arg = sv_dup(arg, param);
#else
PERL_UNUSED_ARG(param);
#endif
PerlIO_list_push(aTHX_ list, proto->array[i].funcs, arg);
}
}
return list;
}
void
PerlIO_clone(pTHX_ PerlInterpreter *proto, CLONE_PARAMS *param)
{
#ifdef USE_ITHREADS
PerlIOl **table = &proto->Iperlio;
PerlIOl *f;
PL_perlio = NULL;
PL_known_layers = PerlIO_clone_list(aTHX_ proto->Iknown_layers, param);
PL_def_layerlist = PerlIO_clone_list(aTHX_ proto->Idef_layerlist, param);
PerlIO_init_table(aTHX);
DEBUG_i( PerlIO_debug("Clone %p from %p\n",(void*)aTHX,(void*)proto) );
while ((f = *table)) {
int i;
table = &f->next;
f++;
for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
if (f->next) {
(void) fp_dup(&(f->next), 0, param);
}
f++;
}
}
#else
PERL_UNUSED_CONTEXT;
PERL_UNUSED_ARG(proto);
PERL_UNUSED_ARG(param);
#endif
}
void
PerlIO_destruct(pTHX)
{
PerlIOl **table = &PL_perlio;
PerlIOl *f;
#ifdef USE_ITHREADS
DEBUG_i( PerlIO_debug("Destruct %p\n",(void*)aTHX) );
#endif
while ((f = *table)) {
int i;
table = &f->next;
f++;
for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
PerlIO *x = &(f->next);
const PerlIOl *l;
while ((l = *x)) {
if (l->tab && l->tab->kind & PERLIO_K_DESTRUCT) {
DEBUG_i( PerlIO_debug("Destruct popping %s\n", l->tab->name) );
PerlIO_flush(x);
PerlIO_pop(aTHX_ x);
}
else {
x = PerlIONext(x);
}
}
f++;
}
}
}
void
PerlIO_pop(pTHX_ PerlIO *f)
{
const PerlIOl *l = *f;
VERIFY_HEAD(f);
if (l) {
DEBUG_i( PerlIO_debug("PerlIO_pop f=%p %s\n", (void*)f,
l->tab ? l->tab->name : "(Null)") );
if (l->tab && l->tab->Popped) {
/*
* If popped returns non-zero do not free its layer structure
* it has either done so itself, or it is shared and still in
* use
*/
if ((*l->tab->Popped) (aTHX_ f) != 0)
return;
}
if (PerlIO_lockcnt(f)) {
/* we're in use; defer freeing the structure */
PerlIOBase(f)->flags = PERLIO_F_CLEARED;
PerlIOBase(f)->tab = NULL;
}
else {
*f = l->next;
Safefree(l);
}
}
}
/* Return as an array the stack of layers on a filehandle. Note that
* the stack is returned top-first in the array, and there are three
* times as many array elements as there are layers in the stack: the
* first element of a layer triplet is the name, the second one is the
* arguments, and the third one is the flags. */
AV *
PerlIO_get_layers(pTHX_ PerlIO *f)
{
AV * const av = newAV();
if (PerlIOValid(f)) {
PerlIOl *l = PerlIOBase(f);
while (l) {
/* There is some collusion in the implementation of
XS_PerlIO_get_layers - it knows that name and flags are
generated as fresh SVs here, and takes advantage of that to
"copy" them by taking a reference. If it changes here, it needs
to change there too. */
SV * const name = l->tab && l->tab->name ?
newSVpv(l->tab->name, 0) : &PL_sv_undef;
SV * const arg = l->tab && l->tab->Getarg ?
(*l->tab->Getarg)(aTHX_ &l, 0, 0) : &PL_sv_undef;
av_push_simple(av, name);
av_push_simple(av, arg);
av_push_simple(av, newSViv((IV)l->flags));
l = l->next;
}
}
return av;
}
/*--------------------------------------------------------------------------------------*/
/*
* XS Interface for perl code
*/
PerlIO_funcs *
PerlIO_find_layer(pTHX_ const char *name, STRLEN len, int load)
{
IV i;
if ((SSize_t) len <= 0)
len = strlen(name);
for (i = 0; i < PL_known_layers->cur; i++) {
PerlIO_funcs * const f = PL_known_layers->array[i].funcs;
const STRLEN this_len = strlen(f->name);
if (this_len == len && memEQ(f->name, name, len)) {
DEBUG_i( PerlIO_debug("%.*s => %p\n", (int) len, name, (void*)f) );
return f;
}
}
if (load && PL_subname && PL_def_layerlist
&& PL_def_layerlist->cur >= 2) {
if (PL_in_load_module) {
croak("Recursive call to Perl_load_module in PerlIO_find_layer");
return NULL;
} else {
SV * const pkgsv = newSVpvs("PerlIO");
SV * const layer = newSVpvn(name, len);
CV * const cv = get_cvs("PerlIO::Layer::NoWarnings", 0);
ENTER;
SAVEBOOL(PL_in_load_module);
if (cv) {
SAVEGENERICSV(PL_warnhook);
PL_warnhook = MUTABLE_SV((SvREFCNT_inc_simple_NN(cv)));
}
PL_in_load_module = TRUE;
/*
* The two SVs are magically freed by load_module
*/
Perl_load_module(aTHX_ 0, pkgsv, NULL, layer, NULL);
LEAVE;
return PerlIO_find_layer(aTHX_ name, len, 0);
}
}
DEBUG_i( PerlIO_debug("Cannot find %.*s\n", (int) len, name) );
return NULL;
}
#ifdef USE_ATTRIBUTES_FOR_PERLIO
static int
perlio_mg_set(pTHX_ SV *sv, MAGIC *mg)
{
if (SvROK(sv)) {
IO * const io = GvIOn(GV_FROM_REF(sv));
PerlIO * const ifp = IoIFP(io);
PerlIO * const ofp = IoOFP(io);
warn("set %" SVf " %p %p %p",
SVfARG(sv), (void*)io, (void*)ifp, (void*)ofp);
}
return 0;
}
static int
perlio_mg_get(pTHX_ SV *sv, MAGIC *mg)
{
if (SvROK(sv)) {
IO * const io = GvIOn(GV_FROM_REF(sv));
PerlIO * const ifp = IoIFP(io);
PerlIO * const ofp = IoOFP(io);
warn("get %" SVf " %p %p %p",
SVfARG(sv), (void*)io, (void*)ifp, (void*)ofp);
}
return 0;
}
static int
perlio_mg_clear(pTHX_ SV *sv, MAGIC *mg)
{
warn("clear %" SVf, SVfARG(sv));
return 0;
}
static int
perlio_mg_free(pTHX_ SV *sv, MAGIC *mg)
{
warn("free %" SVf, SVfARG(sv));
return 0;
}
MGVTBL perlio_vtab = {
perlio_mg_get,
perlio_mg_set,
NULL, /* len */
perlio_mg_clear,
perlio_mg_free
};
XS(XS_io_MODIFY_SCALAR_ATTRIBUTES); /* prototype to pass -Wmissing-prototypes */
XS(XS_io_MODIFY_SCALAR_ATTRIBUTES)
{
dXSARGS;
SV * const sv = SvRV(ST(1));
AV * const av = newAV();
MAGIC *mg;
int count = 0;
int i;
sv_magic(sv, MUTABLE_SV(av), PERL_MAGIC_ext, NULL, 0);
SvRMAGICAL_off(sv);
mg = mg_find(sv, PERL_MAGIC_ext);
mg->mg_virtual = &perlio_vtab;
mg_magical(sv);
warn("attrib %" SVf, SVfARG(sv));
for (i = 2; i < items; i++) {
STRLEN len;
const char * const name = SvPV_const(ST(i), len);
SV * const layer = PerlIO_find_layer(aTHX_ name, len, 1);
if (layer) {
av_push_simple(av, SvREFCNT_inc_simple_NN(layer));
}
else {
ST(count) = ST(i);
count++;
}
}
SvREFCNT_dec(av);
XSRETURN(count);
}
#endif /* USE_ATTRIBUTES_FOR_PERLIO */
SV *
PerlIO_tab_sv(pTHX_ PerlIO_funcs *tab)
{
HV * const stash = gv_stashpvs("PerlIO::Layer", GV_ADD);
SV * const sv = sv_bless(newRV_noinc(newSViv(PTR2IV(tab))), stash);
return sv;
}
XS(XS_PerlIO__Layer__NoWarnings); /* prototype to pass -Wmissing-prototypes */
XS(XS_PerlIO__Layer__NoWarnings)
{
/* This is used as a %SIG{__WARN__} handler to suppress warnings
during loading of layers.
*/
dXSARGS;
PERL_UNUSED_VAR(items);
DEBUG_i(
if (items)
PerlIO_debug("warning:%s\n",SvPV_nolen_const(ST(0))) );
XSRETURN(0);
}
XS(XS_PerlIO__Layer__find); /* prototype to pass -Wmissing-prototypes */
XS(XS_PerlIO__Layer__find)
{
dXSARGS;
if (items < 2)
croak("Usage class->find(name[,load])");
else {
STRLEN len;
const char * const name = SvPV_const(ST(1), len);
const bool load = (items > 2) ? SvTRUE_NN(ST(2)) : 0;
PerlIO_funcs * const layer = PerlIO_find_layer(aTHX_ name, len, load);
ST(0) =
(layer) ? sv_2mortal(PerlIO_tab_sv(aTHX_ layer)) :
&PL_sv_undef;
XSRETURN(1);
}
}
void
PerlIO_define_layer(pTHX_ PerlIO_funcs *tab)
{
if (!PL_known_layers)
PL_known_layers = PerlIO_list_alloc(aTHX);
PerlIO_list_push(aTHX_ PL_known_layers, tab, NULL);
DEBUG_i( PerlIO_debug("define %s %p\n", tab->name, (void*)tab) );
}
int
PerlIO_parse_layers(pTHX_ PerlIO_list_t *av, const char *names)
{
if (names) {
const char *s = names;
while (*s) {
while (isSPACE(*s) || *s == ':')
s++;
if (*s) {
STRLEN llen = 0;
const char *e = s;
const char *as = NULL;
STRLEN alen = 0;
if (!isIDFIRST(*s)) {
/*
* Message is consistent with how attribute lists are
* passed. Even though this means "foo : : bar" is
* seen as an invalid separator character.
*/
const char q = ((*s == '\'') ? '"' : '\'');
ck_warner(packWARN(WARN_LAYER),
"Invalid separator character %c%c%c in PerlIO layer specification %s",
q, *s, q, s);
SETERRNO(EINVAL, LIB_INVARG);
return -1;
}
do {
e++;
} while (isWORDCHAR(*e));
llen = e - s;
if (*e == '(') {
int nesting = 1;
as = ++e;
while (nesting) {
switch (*e++) {
case ')':
if (--nesting == 0)
alen = (e - 1) - as;
break;
case '(':
++nesting;
break;
case '\\':
/*
* It's a nul terminated string, not allowed
* to \ the terminating null. Anything other
* character is passed over.
*/
if (*e++) {
break;
}
/* Fall through */
case '\0':
e--;
ck_warner(packWARN(WARN_LAYER),
"Argument list not closed for PerlIO layer \"%.*s\"",
(int) (e - s), s);
return -1;
default:
/*
* boring.
*/
break;
}
}
}
if (e > s) {
PerlIO_funcs * const layer =
PerlIO_find_layer(aTHX_ s, llen, 1);
if (layer) {
SV *arg = NULL;
if (as)
arg = newSVpvn(as, alen);
PerlIO_list_push(aTHX_ av, layer,
(arg) ? arg : &PL_sv_undef);
SvREFCNT_dec(arg);
}
else {
ck_warner(packWARN(WARN_LAYER), "Unknown PerlIO layer \"%.*s\"",
(int) llen, s);
return -1;
}
}
s = e;
}
}
}
return 0;
}
void
PerlIO_default_buffer(pTHX_ PerlIO_list_t *av)
{
PERLIO_FUNCS_DECL(*tab) = &PerlIO_perlio;
#ifdef PERLIO_USING_CRLF
tab = &PerlIO_crlf;
#else
if (PerlIO_stdio.Set_ptrcnt)
tab = &PerlIO_stdio;
#endif
DEBUG_i( PerlIO_debug("Pushing %s\n", tab->name) );
PerlIO_list_push(aTHX_ av, (PerlIO_funcs *)tab, &PL_sv_undef);
}
SV *
PerlIO_arg_fetch(PerlIO_list_t *av, IV n)
{
return av->array[n].arg;
}
PerlIO_funcs *
PerlIO_layer_fetch(pTHX_ PerlIO_list_t *av, IV n, PerlIO_funcs *def)
{
if (n >= 0 && n < av->cur) {
DEBUG_i( PerlIO_debug("Layer %" IVdf " is %s\n", n,