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doop.c
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/* doop.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
* 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009 by 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.
*
*/
/*
* 'So that was the job I felt I had to do when I started,' thought Sam.
*
* [p.934 of _The Lord of the Rings_, VI/iii: "Mount Doom"]
*/
/* This file contains some common functions needed to carry out certain
* ops. For example both pp_schomp() and pp_chomp() - scalar and array
* chomp operations - call the function do_chomp() found in this file.
*/
#include "EXTERN.h"
#define PERL_IN_DOOP_C
#include "perl.h"
#ifndef PERL_MICRO
#include <signal.h>
#endif
STATIC I32
S_do_trans_simple(pTHX_ SV * const sv)
{
dVAR;
I32 matches = 0;
STRLEN len;
U8 *s = (U8*)SvPV(sv,len);
U8 * const send = s+len;
const short * const tbl = (short*)cPVOP->op_pv;
PERL_ARGS_ASSERT_DO_TRANS_SIMPLE;
if (!tbl)
Perl_croak(aTHX_ "panic: do_trans_simple line %d",__LINE__);
/* First, take care of non-UTF-8 input strings, because they're easy */
if (!SvUTF8(sv)) {
while (s < send) {
const I32 ch = tbl[*s];
if (ch >= 0) {
matches++;
*s = (U8)ch;
}
s++;
}
SvSETMAGIC(sv);
}
else {
const I32 grows = PL_op->op_private & OPpTRANS_GROWS;
U8 *d;
U8 *dstart;
/* Allow for expansion: $_="a".chr(400); tr/a/\xFE/, FE needs encoding */
if (grows)
Newx(d, len*2+1, U8);
else
d = s;
dstart = d;
while (s < send) {
STRLEN ulen;
I32 ch;
/* Need to check this, otherwise 128..255 won't match */
const UV c = utf8n_to_uvchr(s, send - s, &ulen, UTF8_ALLOW_DEFAULT);
if (c < 0x100 && (ch = tbl[c]) >= 0) {
matches++;
d = uvchr_to_utf8(d, ch);
s += ulen;
}
else { /* No match -> copy */
Move(s, d, ulen, U8);
d += ulen;
s += ulen;
}
}
if (grows) {
sv_setpvn(sv, (char*)dstart, d - dstart);
Safefree(dstart);
}
else {
*d = '\0';
SvCUR_set(sv, d - dstart);
}
SvUTF8_on(sv);
SvSETMAGIC(sv);
}
return matches;
}
STATIC I32
S_do_trans_count(pTHX_ SV * const sv)
{
dVAR;
STRLEN len;
const U8 *s = (const U8*)SvPV_const(sv, len);
const U8 * const send = s + len;
I32 matches = 0;
const short * const tbl = (short*)cPVOP->op_pv;
PERL_ARGS_ASSERT_DO_TRANS_COUNT;
if (!tbl)
Perl_croak(aTHX_ "panic: do_trans_count line %d",__LINE__);
if (!SvUTF8(sv)) {
while (s < send) {
if (tbl[*s++] >= 0)
matches++;
}
}
else {
const I32 complement = PL_op->op_private & OPpTRANS_COMPLEMENT;
while (s < send) {
STRLEN ulen;
const UV c = utf8n_to_uvchr(s, send - s, &ulen, UTF8_ALLOW_DEFAULT);
if (c < 0x100) {
if (tbl[c] >= 0)
matches++;
} else if (complement)
matches++;
s += ulen;
}
}
return matches;
}
STATIC I32
S_do_trans_complex(pTHX_ SV * const sv)
{
dVAR;
STRLEN len;
U8 *s = (U8*)SvPV(sv, len);
U8 * const send = s+len;
I32 matches = 0;
const short * const tbl = (short*)cPVOP->op_pv;
PERL_ARGS_ASSERT_DO_TRANS_COMPLEX;
if (!tbl)
Perl_croak(aTHX_ "panic: do_trans_complex line %d",__LINE__);
if (!SvUTF8(sv)) {
U8 *d = s;
U8 * const dstart = d;
if (PL_op->op_private & OPpTRANS_SQUASH) {
const U8* p = send;
while (s < send) {
const I32 ch = tbl[*s];
if (ch >= 0) {
*d = (U8)ch;
matches++;
if (p != d - 1 || *p != *d)
p = d++;
}
else if (ch == -1) /* -1 is unmapped character */
*d++ = *s;
else if (ch == -2) /* -2 is delete character */
matches++;
s++;
}
}
else {
while (s < send) {
const I32 ch = tbl[*s];
if (ch >= 0) {
matches++;
*d++ = (U8)ch;
}
else if (ch == -1) /* -1 is unmapped character */
*d++ = *s;
else if (ch == -2) /* -2 is delete character */
matches++;
s++;
}
}
*d = '\0';
SvCUR_set(sv, d - dstart);
}
else { /* is utf8 */
const I32 complement = PL_op->op_private & OPpTRANS_COMPLEMENT;
const I32 grows = PL_op->op_private & OPpTRANS_GROWS;
const I32 del = PL_op->op_private & OPpTRANS_DELETE;
U8 *d;
U8 *dstart;
STRLEN rlen = 0;
if (grows)
Newx(d, len*2+1, U8);
else
d = s;
dstart = d;
if (complement && !del)
rlen = tbl[0x100];
#ifdef MACOS_TRADITIONAL
#define comp CoMP /* "comp" is a keyword in some compilers ... */
#endif
if (PL_op->op_private & OPpTRANS_SQUASH) {
UV pch = 0xfeedface;
while (s < send) {
STRLEN len;
const UV comp = utf8n_to_uvchr(s, send - s, &len,
UTF8_ALLOW_DEFAULT);
I32 ch;
if (comp > 0xff) {
if (!complement) {
Move(s, d, len, U8);
d += len;
}
else {
matches++;
if (!del) {
ch = (rlen == 0) ? (I32)comp :
(comp - 0x100 < rlen) ?
tbl[comp+1] : tbl[0x100+rlen];
if ((UV)ch != pch) {
d = uvchr_to_utf8(d, ch);
pch = (UV)ch;
}
s += len;
continue;
}
}
}
else if ((ch = tbl[comp]) >= 0) {
matches++;
if ((UV)ch != pch) {
d = uvchr_to_utf8(d, ch);
pch = (UV)ch;
}
s += len;
continue;
}
else if (ch == -1) { /* -1 is unmapped character */
Move(s, d, len, U8);
d += len;
}
else if (ch == -2) /* -2 is delete character */
matches++;
s += len;
pch = 0xfeedface;
}
}
else {
while (s < send) {
STRLEN len;
const UV comp = utf8n_to_uvchr(s, send - s, &len,
UTF8_ALLOW_DEFAULT);
I32 ch;
if (comp > 0xff) {
if (!complement) {
Move(s, d, len, U8);
d += len;
}
else {
matches++;
if (!del) {
if (comp - 0x100 < rlen)
d = uvchr_to_utf8(d, tbl[comp+1]);
else
d = uvchr_to_utf8(d, tbl[0x100+rlen]);
}
}
}
else if ((ch = tbl[comp]) >= 0) {
d = uvchr_to_utf8(d, ch);
matches++;
}
else if (ch == -1) { /* -1 is unmapped character */
Move(s, d, len, U8);
d += len;
}
else if (ch == -2) /* -2 is delete character */
matches++;
s += len;
}
}
if (grows) {
sv_setpvn(sv, (char*)dstart, d - dstart);
Safefree(dstart);
}
else {
*d = '\0';
SvCUR_set(sv, d - dstart);
}
SvUTF8_on(sv);
}
SvSETMAGIC(sv);
return matches;
}
STATIC I32
S_do_trans_simple_utf8(pTHX_ SV * const sv)
{
dVAR;
U8 *s;
U8 *send;
U8 *d;
U8 *start;
U8 *dstart, *dend;
I32 matches = 0;
const I32 grows = PL_op->op_private & OPpTRANS_GROWS;
STRLEN len;
SV* const rv =
#ifdef USE_ITHREADS
PAD_SVl(cPADOP->op_padix);
#else
MUTABLE_SV(cSVOP->op_sv);
#endif
HV* const hv = MUTABLE_HV(SvRV(rv));
SV* const * svp = hv_fetchs(hv, "NONE", FALSE);
const UV none = svp ? SvUV(*svp) : 0x7fffffff;
const UV extra = none + 1;
UV final = 0;
U8 hibit = 0;
PERL_ARGS_ASSERT_DO_TRANS_SIMPLE_UTF8;
s = (U8*)SvPV(sv, len);
if (!SvUTF8(sv)) {
const U8 *t = s;
const U8 * const e = s + len;
while (t < e) {
const U8 ch = *t++;
hibit = !NATIVE_IS_INVARIANT(ch);
if (hibit) {
s = bytes_to_utf8(s, &len);
break;
}
}
}
send = s + len;
start = s;
svp = hv_fetchs(hv, "FINAL", FALSE);
if (svp)
final = SvUV(*svp);
if (grows) {
/* d needs to be bigger than s, in case e.g. upgrading is required */
Newx(d, len * 3 + UTF8_MAXBYTES, U8);
dend = d + len * 3;
dstart = d;
}
else {
dstart = d = s;
dend = d + len;
}
while (s < send) {
const UV uv = swash_fetch(rv, s, TRUE);
if (uv < none) {
s += UTF8SKIP(s);
matches++;
d = uvuni_to_utf8(d, uv);
}
else if (uv == none) {
const int i = UTF8SKIP(s);
Move(s, d, i, U8);
d += i;
s += i;
}
else if (uv == extra) {
s += UTF8SKIP(s);
matches++;
d = uvuni_to_utf8(d, final);
}
else
s += UTF8SKIP(s);
if (d > dend) {
const STRLEN clen = d - dstart;
const STRLEN nlen = dend - dstart + len + UTF8_MAXBYTES;
if (!grows)
Perl_croak(aTHX_ "panic: do_trans_simple_utf8 line %d",__LINE__);
Renew(dstart, nlen + UTF8_MAXBYTES, U8);
d = dstart + clen;
dend = dstart + nlen;
}
}
if (grows || hibit) {
sv_setpvn(sv, (char*)dstart, d - dstart);
Safefree(dstart);
if (grows && hibit)
Safefree(start);
}
else {
*d = '\0';
SvCUR_set(sv, d - dstart);
}
SvSETMAGIC(sv);
SvUTF8_on(sv);
return matches;
}
STATIC I32
S_do_trans_count_utf8(pTHX_ SV * const sv)
{
dVAR;
const U8 *s;
const U8 *start = NULL;
const U8 *send;
I32 matches = 0;
STRLEN len;
SV* const rv =
#ifdef USE_ITHREADS
PAD_SVl(cPADOP->op_padix);
#else
MUTABLE_SV(cSVOP->op_sv);
#endif
HV* const hv = MUTABLE_HV(SvRV(rv));
SV* const * const svp = hv_fetchs(hv, "NONE", FALSE);
const UV none = svp ? SvUV(*svp) : 0x7fffffff;
const UV extra = none + 1;
U8 hibit = 0;
PERL_ARGS_ASSERT_DO_TRANS_COUNT_UTF8;
s = (const U8*)SvPV_const(sv, len);
if (!SvUTF8(sv)) {
const U8 *t = s;
const U8 * const e = s + len;
while (t < e) {
const U8 ch = *t++;
hibit = !NATIVE_IS_INVARIANT(ch);
if (hibit) {
start = s = bytes_to_utf8(s, &len);
break;
}
}
}
send = s + len;
while (s < send) {
const UV uv = swash_fetch(rv, s, TRUE);
if (uv < none || uv == extra)
matches++;
s += UTF8SKIP(s);
}
if (hibit)
Safefree(start);
return matches;
}
STATIC I32
S_do_trans_complex_utf8(pTHX_ SV * const sv)
{
dVAR;
U8 *start, *send;
U8 *d;
I32 matches = 0;
const I32 squash = PL_op->op_private & OPpTRANS_SQUASH;
const I32 del = PL_op->op_private & OPpTRANS_DELETE;
const I32 grows = PL_op->op_private & OPpTRANS_GROWS;
SV* const rv =
#ifdef USE_ITHREADS
PAD_SVl(cPADOP->op_padix);
#else
MUTABLE_SV(cSVOP->op_sv);
#endif
HV * const hv = MUTABLE_HV(SvRV(rv));
SV * const *svp = hv_fetchs(hv, "NONE", FALSE);
const UV none = svp ? SvUV(*svp) : 0x7fffffff;
const UV extra = none + 1;
UV final = 0;
bool havefinal = FALSE;
STRLEN len;
U8 *dstart, *dend;
U8 hibit = 0;
U8 *s = (U8*)SvPV(sv, len);
PERL_ARGS_ASSERT_DO_TRANS_COMPLEX_UTF8;
if (!SvUTF8(sv)) {
const U8 *t = s;
const U8 * const e = s + len;
while (t < e) {
const U8 ch = *t++;
hibit = !NATIVE_IS_INVARIANT(ch);
if (hibit) {
s = bytes_to_utf8(s, &len);
break;
}
}
}
send = s + len;
start = s;
svp = hv_fetchs(hv, "FINAL", FALSE);
if (svp) {
final = SvUV(*svp);
havefinal = TRUE;
}
if (grows) {
/* d needs to be bigger than s, in case e.g. upgrading is required */
Newx(d, len * 3 + UTF8_MAXBYTES, U8);
dend = d + len * 3;
dstart = d;
}
else {
dstart = d = s;
dend = d + len;
}
if (squash) {
UV puv = 0xfeedface;
while (s < send) {
UV uv = swash_fetch(rv, s, TRUE);
if (d > dend) {
const STRLEN clen = d - dstart;
const STRLEN nlen = dend - dstart + len + UTF8_MAXBYTES;
if (!grows)
Perl_croak(aTHX_ "panic: do_trans_complex_utf8 line %d",__LINE__);
Renew(dstart, nlen + UTF8_MAXBYTES, U8);
d = dstart + clen;
dend = dstart + nlen;
}
if (uv < none) {
matches++;
s += UTF8SKIP(s);
if (uv != puv) {
d = uvuni_to_utf8(d, uv);
puv = uv;
}
continue;
}
else if (uv == none) { /* "none" is unmapped character */
const int i = UTF8SKIP(s);
Move(s, d, i, U8);
d += i;
s += i;
puv = 0xfeedface;
continue;
}
else if (uv == extra && !del) {
matches++;
if (havefinal) {
s += UTF8SKIP(s);
if (puv != final) {
d = uvuni_to_utf8(d, final);
puv = final;
}
}
else {
STRLEN len;
uv = utf8n_to_uvuni(s, send - s, &len, UTF8_ALLOW_DEFAULT);
if (uv != puv) {
Move(s, d, len, U8);
d += len;
puv = uv;
}
s += len;
}
continue;
}
matches++; /* "none+1" is delete character */
s += UTF8SKIP(s);
}
}
else {
while (s < send) {
const UV uv = swash_fetch(rv, s, TRUE);
if (d > dend) {
const STRLEN clen = d - dstart;
const STRLEN nlen = dend - dstart + len + UTF8_MAXBYTES;
if (!grows)
Perl_croak(aTHX_ "panic: do_trans_complex_utf8 line %d",__LINE__);
Renew(dstart, nlen + UTF8_MAXBYTES, U8);
d = dstart + clen;
dend = dstart + nlen;
}
if (uv < none) {
matches++;
s += UTF8SKIP(s);
d = uvuni_to_utf8(d, uv);
continue;
}
else if (uv == none) { /* "none" is unmapped character */
const int i = UTF8SKIP(s);
Move(s, d, i, U8);
d += i;
s += i;
continue;
}
else if (uv == extra && !del) {
matches++;
s += UTF8SKIP(s);
d = uvuni_to_utf8(d, final);
continue;
}
matches++; /* "none+1" is delete character */
s += UTF8SKIP(s);
}
}
if (grows || hibit) {
sv_setpvn(sv, (char*)dstart, d - dstart);
Safefree(dstart);
if (grows && hibit)
Safefree(start);
}
else {
*d = '\0';
SvCUR_set(sv, d - dstart);
}
SvUTF8_on(sv);
SvSETMAGIC(sv);
return matches;
}
I32
Perl_do_trans(pTHX_ SV *sv)
{
dVAR;
STRLEN len;
const I32 hasutf = (PL_op->op_private &
(OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF));
PERL_ARGS_ASSERT_DO_TRANS;
if (SvREADONLY(sv) && !(PL_op->op_private & OPpTRANS_IDENTICAL)) {
if (SvIsCOW(sv))
sv_force_normal_flags(sv, 0);
if (SvREADONLY(sv))
Perl_croak(aTHX_ "%s", PL_no_modify);
}
(void)SvPV_const(sv, len);
if (!len)
return 0;
if (!(PL_op->op_private & OPpTRANS_IDENTICAL)) {
if (!SvPOKp(sv))
(void)SvPV_force(sv, len);
(void)SvPOK_only_UTF8(sv);
}
DEBUG_t( Perl_deb(aTHX_ "2.TBL\n"));
switch (PL_op->op_private & ~hasutf & (
OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF|OPpTRANS_IDENTICAL|
OPpTRANS_SQUASH|OPpTRANS_DELETE|OPpTRANS_COMPLEMENT)) {
case 0:
if (hasutf)
return do_trans_simple_utf8(sv);
else
return do_trans_simple(sv);
case OPpTRANS_IDENTICAL:
case OPpTRANS_IDENTICAL|OPpTRANS_COMPLEMENT:
if (hasutf)
return do_trans_count_utf8(sv);
else
return do_trans_count(sv);
default:
if (hasutf)
return do_trans_complex_utf8(sv);
else
return do_trans_complex(sv);
}
}
void
Perl_do_join(pTHX_ register SV *sv, SV *delim, register SV **mark, register SV **sp)
{
dVAR;
SV ** const oldmark = mark;
register I32 items = sp - mark;
register STRLEN len;
STRLEN delimlen;
PERL_ARGS_ASSERT_DO_JOIN;
(void) SvPV_const(delim, delimlen); /* stringify and get the delimlen */
/* SvCUR assumes it's SvPOK() and woe betide you if it's not. */
mark++;
len = (items > 0 ? (delimlen * (items - 1) ) : 0);
SvUPGRADE(sv, SVt_PV);
if (SvLEN(sv) < len + items) { /* current length is way too short */
while (items-- > 0) {
if (*mark && !SvGAMAGIC(*mark) && SvOK(*mark)) {
STRLEN tmplen;
SvPV_const(*mark, tmplen);
len += tmplen;
}
mark++;
}
SvGROW(sv, len + 1); /* so try to pre-extend */
mark = oldmark;
items = sp - mark;
++mark;
}
sv_setpvs(sv, "");
/* sv_setpv retains old UTF8ness [perl #24846] */
SvUTF8_off(sv);
if (PL_tainting && SvMAGICAL(sv))
SvTAINTED_off(sv);
if (items-- > 0) {
if (*mark)
sv_catsv(sv, *mark);
mark++;
}
if (delimlen) {
for (; items > 0; items--,mark++) {
sv_catsv(sv,delim);
sv_catsv(sv,*mark);
}
}
else {
for (; items > 0; items--,mark++)
sv_catsv(sv,*mark);
}
SvSETMAGIC(sv);
}
void
Perl_do_sprintf(pTHX_ SV *sv, I32 len, SV **sarg)
{
dVAR;
STRLEN patlen;
const char * const pat = SvPV_const(*sarg, patlen);
bool do_taint = FALSE;
PERL_ARGS_ASSERT_DO_SPRINTF;
SvUTF8_off(sv);
if (DO_UTF8(*sarg))
SvUTF8_on(sv);
sv_vsetpvfn(sv, pat, patlen, NULL, sarg + 1, len - 1, &do_taint);
SvSETMAGIC(sv);
if (do_taint)
SvTAINTED_on(sv);
}
/* currently converts input to bytes if possible, but doesn't sweat failure */
UV
Perl_do_vecget(pTHX_ SV *sv, I32 offset, I32 size)
{
dVAR;
STRLEN srclen, len, uoffset, bitoffs = 0;
const unsigned char *s = (const unsigned char *) SvPV_const(sv, srclen);
UV retnum = 0;
PERL_ARGS_ASSERT_DO_VECGET;
if (offset < 0)
return 0;
if (size < 1 || (size & (size-1))) /* size < 1 or not a power of two */
Perl_croak(aTHX_ "Illegal number of bits in vec");
if (SvUTF8(sv))
(void) Perl_sv_utf8_downgrade(aTHX_ sv, TRUE);
if (size < 8) {
bitoffs = ((offset%8)*size)%8;
uoffset = offset/(8/size);
}
else if (size > 8)
uoffset = offset*(size/8);
else
uoffset = offset;
len = uoffset + (bitoffs + size + 7)/8; /* required number of bytes */
if (len > srclen) {
if (size <= 8)
retnum = 0;
else {
if (size == 16) {
if (uoffset >= srclen)
retnum = 0;
else
retnum = (UV) s[uoffset] << 8;
}
else if (size == 32) {
if (uoffset >= srclen)
retnum = 0;
else if (uoffset + 1 >= srclen)
retnum =
((UV) s[uoffset ] << 24);
else if (uoffset + 2 >= srclen)
retnum =
((UV) s[uoffset ] << 24) +
((UV) s[uoffset + 1] << 16);
else
retnum =
((UV) s[uoffset ] << 24) +
((UV) s[uoffset + 1] << 16) +
( s[uoffset + 2] << 8);
}
#ifdef UV_IS_QUAD
else if (size == 64) {
if (ckWARN(WARN_PORTABLE))
Perl_warner(aTHX_ packWARN(WARN_PORTABLE),
"Bit vector size > 32 non-portable");
if (uoffset >= srclen)
retnum = 0;
else if (uoffset + 1 >= srclen)
retnum =
(UV) s[uoffset ] << 56;
else if (uoffset + 2 >= srclen)
retnum =
((UV) s[uoffset ] << 56) +
((UV) s[uoffset + 1] << 48);
else if (uoffset + 3 >= srclen)
retnum =
((UV) s[uoffset ] << 56) +
((UV) s[uoffset + 1] << 48) +
((UV) s[uoffset + 2] << 40);
else if (uoffset + 4 >= srclen)
retnum =
((UV) s[uoffset ] << 56) +
((UV) s[uoffset + 1] << 48) +
((UV) s[uoffset + 2] << 40) +
((UV) s[uoffset + 3] << 32);
else if (uoffset + 5 >= srclen)
retnum =
((UV) s[uoffset ] << 56) +
((UV) s[uoffset + 1] << 48) +
((UV) s[uoffset + 2] << 40) +
((UV) s[uoffset + 3] << 32) +
( s[uoffset + 4] << 24);
else if (uoffset + 6 >= srclen)
retnum =
((UV) s[uoffset ] << 56) +
((UV) s[uoffset + 1] << 48) +
((UV) s[uoffset + 2] << 40) +
((UV) s[uoffset + 3] << 32) +
((UV) s[uoffset + 4] << 24) +
((UV) s[uoffset + 5] << 16);
else
retnum =
((UV) s[uoffset ] << 56) +
((UV) s[uoffset + 1] << 48) +
((UV) s[uoffset + 2] << 40) +
((UV) s[uoffset + 3] << 32) +
((UV) s[uoffset + 4] << 24) +
((UV) s[uoffset + 5] << 16) +
( s[uoffset + 6] << 8);
}
#endif
}
}
else if (size < 8)
retnum = (s[uoffset] >> bitoffs) & ((1 << size) - 1);
else {
if (size == 8)
retnum = s[uoffset];
else if (size == 16)
retnum =
((UV) s[uoffset] << 8) +
s[uoffset + 1];
else if (size == 32)
retnum =
((UV) s[uoffset ] << 24) +
((UV) s[uoffset + 1] << 16) +
( s[uoffset + 2] << 8) +
s[uoffset + 3];
#ifdef UV_IS_QUAD
else if (size == 64) {
if (ckWARN(WARN_PORTABLE))
Perl_warner(aTHX_ packWARN(WARN_PORTABLE),
"Bit vector size > 32 non-portable");
retnum =
((UV) s[uoffset ] << 56) +
((UV) s[uoffset + 1] << 48) +
((UV) s[uoffset + 2] << 40) +
((UV) s[uoffset + 3] << 32) +
((UV) s[uoffset + 4] << 24) +
((UV) s[uoffset + 5] << 16) +
( s[uoffset + 6] << 8) +
s[uoffset + 7];
}
#endif
}
return retnum;
}
/* currently converts input to bytes if possible but doesn't sweat failures,
* although it does ensure that the string it clobbers is not marked as
* utf8-valid any more
*/
void
Perl_do_vecset(pTHX_ SV *sv)
{
dVAR;
register I32 offset, bitoffs = 0;
register I32 size;
register unsigned char *s;
register UV lval;
I32 mask;
STRLEN targlen;
STRLEN len;
SV * const targ = LvTARG(sv);
PERL_ARGS_ASSERT_DO_VECSET;
if (!targ)
return;
s = (unsigned char*)SvPV_force(targ, targlen);
if (SvUTF8(targ)) {
/* This is handled by the SvPOK_only below...
if (!Perl_sv_utf8_downgrade(aTHX_ targ, TRUE))
SvUTF8_off(targ);
*/
(void) Perl_sv_utf8_downgrade(aTHX_ targ, TRUE);
}
(void)SvPOK_only(targ);
lval = SvUV(sv);
offset = LvTARGOFF(sv);
if (offset < 0)
Perl_croak(aTHX_ "Negative offset to vec in lvalue context");
size = LvTARGLEN(sv);
if (size < 1 || (size & (size-1))) /* size < 1 or not a power of two */
Perl_croak(aTHX_ "Illegal number of bits in vec");
if (size < 8) {
bitoffs = ((offset%8)*size)%8;
offset /= 8/size;
}
else if (size > 8)
offset *= size/8;
len = offset + (bitoffs + size + 7)/8; /* required number of bytes */
if (len > targlen) {
s = (unsigned char*)SvGROW(targ, len + 1);
(void)memzero((char *)(s + targlen), len - targlen + 1);
SvCUR_set(targ, len);
}
if (size < 8) {
mask = (1 << size) - 1;
lval &= mask;
s[offset] &= ~(mask << bitoffs);
s[offset] |= lval << bitoffs;
}
else {
if (size == 8)
s[offset ] = (U8)( lval & 0xff);
else if (size == 16) {
s[offset ] = (U8)((lval >> 8) & 0xff);
s[offset+1] = (U8)( lval & 0xff);
}
else if (size == 32) {
s[offset ] = (U8)((lval >> 24) & 0xff);
s[offset+1] = (U8)((lval >> 16) & 0xff);
s[offset+2] = (U8)((lval >> 8) & 0xff);
s[offset+3] = (U8)( lval & 0xff);
}
#ifdef UV_IS_QUAD
else if (size == 64) {
if (ckWARN(WARN_PORTABLE))
Perl_warner(aTHX_ packWARN(WARN_PORTABLE),
"Bit vector size > 32 non-portable");
s[offset ] = (U8)((lval >> 56) & 0xff);
s[offset+1] = (U8)((lval >> 48) & 0xff);
s[offset+2] = (U8)((lval >> 40) & 0xff);
s[offset+3] = (U8)((lval >> 32) & 0xff);
s[offset+4] = (U8)((lval >> 24) & 0xff);
s[offset+5] = (U8)((lval >> 16) & 0xff);
s[offset+6] = (U8)((lval >> 8) & 0xff);
s[offset+7] = (U8)( lval & 0xff);
}
#endif
}
SvSETMAGIC(targ);
}
void
Perl_do_chop(pTHX_ register SV *astr, register SV *sv)
{
dVAR;
STRLEN len;
char *s;
PERL_ARGS_ASSERT_DO_CHOP;