/* inline.h
*
* Copyright (C) 2012 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.
*
* This file contains tables and code adapted from
* https://bjoern.hoehrmann.de/utf-8/decoder/dfa/, which requires this
* copyright notice:
Copyright (c) 2008-2009 Bjoern Hoehrmann
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*
* This file is a home for static inline functions that cannot go in other
* header files, because they depend on proto.h (included after most other
* headers) or struct definitions.
*
* Each section names the header file that the functions "belong" to.
*/
/* ------------------------------- av.h ------------------------------- */
/*
=for apidoc av_count
Returns the number of elements in the array C. This is the true length of
the array, including any undefined elements. It is always the same as
S>.
=cut
*/
PERL_STATIC_INLINE Size_t
Perl_av_count(pTHX_ AV *av)
{
PERL_ARGS_ASSERT_AV_COUNT;
assert(SvTYPE(av) == SVt_PVAV);
return AvFILL(av) + 1;
}
/* ------------------------------- cv.h ------------------------------- */
PERL_STATIC_INLINE GV *
Perl_CvGV(pTHX_ CV *sv)
{
PERL_ARGS_ASSERT_CVGV;
return CvNAMED(sv)
? Perl_cvgv_from_hek(aTHX_ sv)
: ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_gv_u.xcv_gv;
}
PERL_STATIC_INLINE I32 *
Perl_CvDEPTH(const CV * const sv)
{
PERL_ARGS_ASSERT_CVDEPTH;
assert(SvTYPE(sv) == SVt_PVCV || SvTYPE(sv) == SVt_PVFM);
return &((XPVCV*)SvANY(sv))->xcv_depth;
}
/*
CvPROTO returns the prototype as stored, which is not necessarily what
the interpreter should be using. Specifically, the interpreter assumes
that spaces have been stripped, which has been the case if the prototype
was added by toke.c, but is generally not the case if it was added elsewhere.
Since we can't enforce the spacelessness at assignment time, this routine
provides a temporary copy at parse time with spaces removed.
I is the start of the original buffer, I is the length of the
prototype and will be updated when this returns.
*/
#ifdef PERL_CORE
PERL_STATIC_INLINE char *
S_strip_spaces(pTHX_ const char * orig, STRLEN * const len)
{
SV * tmpsv;
char * tmps;
tmpsv = newSVpvn_flags(orig, *len, SVs_TEMP);
tmps = SvPVX(tmpsv);
while ((*len)--) {
if (!isSPACE(*orig))
*tmps++ = *orig;
orig++;
}
*tmps = '\0';
*len = tmps - SvPVX(tmpsv);
return SvPVX(tmpsv);
}
#endif
/* ------------------------------- mg.h ------------------------------- */
#if defined(PERL_CORE) || defined(PERL_EXT)
/* assumes get-magic and stringification have already occurred */
PERL_STATIC_INLINE STRLEN
S_MgBYTEPOS(pTHX_ MAGIC *mg, SV *sv, const char *s, STRLEN len)
{
assert(mg->mg_type == PERL_MAGIC_regex_global);
assert(mg->mg_len != -1);
if (mg->mg_flags & MGf_BYTES || !DO_UTF8(sv))
return (STRLEN)mg->mg_len;
else {
const STRLEN pos = (STRLEN)mg->mg_len;
/* Without this check, we may read past the end of the buffer: */
if (pos > sv_or_pv_len_utf8(sv, s, len)) return len+1;
return sv_or_pv_pos_u2b(sv, s, pos, NULL);
}
}
#endif
/* ------------------------------- pad.h ------------------------------ */
#if defined(PERL_IN_PAD_C) || defined(PERL_IN_OP_C)
PERL_STATIC_INLINE bool
S_PadnameIN_SCOPE(const PADNAME * const pn, const U32 seq)
{
PERL_ARGS_ASSERT_PADNAMEIN_SCOPE;
/* is seq within the range _LOW to _HIGH ?
* This is complicated by the fact that PL_cop_seqmax
* may have wrapped around at some point */
if (COP_SEQ_RANGE_LOW(pn) == PERL_PADSEQ_INTRO)
return FALSE; /* not yet introduced */
if (COP_SEQ_RANGE_HIGH(pn) == PERL_PADSEQ_INTRO) {
/* in compiling scope */
if (
(seq > COP_SEQ_RANGE_LOW(pn))
? (seq - COP_SEQ_RANGE_LOW(pn) < (U32_MAX >> 1))
: (COP_SEQ_RANGE_LOW(pn) - seq > (U32_MAX >> 1))
)
return TRUE;
}
else if (
(COP_SEQ_RANGE_LOW(pn) > COP_SEQ_RANGE_HIGH(pn))
?
( seq > COP_SEQ_RANGE_LOW(pn)
|| seq <= COP_SEQ_RANGE_HIGH(pn))
: ( seq > COP_SEQ_RANGE_LOW(pn)
&& seq <= COP_SEQ_RANGE_HIGH(pn))
)
return TRUE;
return FALSE;
}
#endif
/* ------------------------------- pp.h ------------------------------- */
PERL_STATIC_INLINE I32
Perl_TOPMARK(pTHX)
{
DEBUG_s(DEBUG_v(PerlIO_printf(Perl_debug_log,
"MARK top %p %" IVdf "\n",
PL_markstack_ptr,
(IV)*PL_markstack_ptr)));
return *PL_markstack_ptr;
}
PERL_STATIC_INLINE I32
Perl_POPMARK(pTHX)
{
DEBUG_s(DEBUG_v(PerlIO_printf(Perl_debug_log,
"MARK pop %p %" IVdf "\n",
(PL_markstack_ptr-1),
(IV)*(PL_markstack_ptr-1))));
assert((PL_markstack_ptr > PL_markstack) || !"MARK underflow");
return *PL_markstack_ptr--;
}
/* ----------------------------- regexp.h ----------------------------- */
PERL_STATIC_INLINE struct regexp *
Perl_ReANY(const REGEXP * const re)
{
XPV* const p = (XPV*)SvANY(re);
PERL_ARGS_ASSERT_REANY;
assert(isREGEXP(re));
return SvTYPE(re) == SVt_PVLV ? p->xpv_len_u.xpvlenu_rx
: (struct regexp *)p;
}
/* ------------------------------- sv.h ------------------------------- */
PERL_STATIC_INLINE bool
Perl_SvTRUE(pTHX_ SV *sv) {
if (!LIKELY(sv))
return FALSE;
SvGETMAGIC(sv);
return SvTRUE_nomg_NN(sv);
}
PERL_STATIC_INLINE SV *
Perl_SvREFCNT_inc(SV *sv)
{
if (LIKELY(sv != NULL))
SvREFCNT(sv)++;
return sv;
}
PERL_STATIC_INLINE SV *
Perl_SvREFCNT_inc_NN(SV *sv)
{
PERL_ARGS_ASSERT_SVREFCNT_INC_NN;
SvREFCNT(sv)++;
return sv;
}
PERL_STATIC_INLINE void
Perl_SvREFCNT_inc_void(SV *sv)
{
if (LIKELY(sv != NULL))
SvREFCNT(sv)++;
}
PERL_STATIC_INLINE void
Perl_SvREFCNT_dec(pTHX_ SV *sv)
{
if (LIKELY(sv != NULL)) {
U32 rc = SvREFCNT(sv);
if (LIKELY(rc > 1))
SvREFCNT(sv) = rc - 1;
else
Perl_sv_free2(aTHX_ sv, rc);
}
}
PERL_STATIC_INLINE void
Perl_SvREFCNT_dec_NN(pTHX_ SV *sv)
{
U32 rc = SvREFCNT(sv);
PERL_ARGS_ASSERT_SVREFCNT_DEC_NN;
if (LIKELY(rc > 1))
SvREFCNT(sv) = rc - 1;
else
Perl_sv_free2(aTHX_ sv, rc);
}
PERL_STATIC_INLINE void
Perl_SvAMAGIC_on(SV *sv)
{
PERL_ARGS_ASSERT_SVAMAGIC_ON;
assert(SvROK(sv));
if (SvOBJECT(SvRV(sv))) HvAMAGIC_on(SvSTASH(SvRV(sv)));
}
PERL_STATIC_INLINE void
Perl_SvAMAGIC_off(SV *sv)
{
PERL_ARGS_ASSERT_SVAMAGIC_OFF;
if (SvROK(sv) && SvOBJECT(SvRV(sv)))
HvAMAGIC_off(SvSTASH(SvRV(sv)));
}
PERL_STATIC_INLINE U32
Perl_SvPADSTALE_on(SV *sv)
{
assert(!(SvFLAGS(sv) & SVs_PADTMP));
return SvFLAGS(sv) |= SVs_PADSTALE;
}
PERL_STATIC_INLINE U32
Perl_SvPADSTALE_off(SV *sv)
{
assert(!(SvFLAGS(sv) & SVs_PADTMP));
return SvFLAGS(sv) &= ~SVs_PADSTALE;
}
#if defined(PERL_CORE) || defined (PERL_EXT)
PERL_STATIC_INLINE STRLEN
S_sv_or_pv_pos_u2b(pTHX_ SV *sv, const char *pv, STRLEN pos, STRLEN *lenp)
{
PERL_ARGS_ASSERT_SV_OR_PV_POS_U2B;
if (SvGAMAGIC(sv)) {
U8 *hopped = utf8_hop((U8 *)pv, pos);
if (lenp) *lenp = (STRLEN)(utf8_hop(hopped, *lenp) - hopped);
return (STRLEN)(hopped - (U8 *)pv);
}
return sv_pos_u2b_flags(sv,pos,lenp,SV_CONST_RETURN);
}
#endif
/* ------------------------------- utf8.h ------------------------------- */
/*
=head1 Unicode Support
*/
PERL_STATIC_INLINE void
Perl_append_utf8_from_native_byte(const U8 byte, U8** dest)
{
/* Takes an input 'byte' (Latin1 or EBCDIC) and appends it to the UTF-8
* encoded string at '*dest', updating '*dest' to include it */
PERL_ARGS_ASSERT_APPEND_UTF8_FROM_NATIVE_BYTE;
if (NATIVE_BYTE_IS_INVARIANT(byte))
*((*dest)++) = byte;
else {
*((*dest)++) = UTF8_EIGHT_BIT_HI(byte);
*((*dest)++) = UTF8_EIGHT_BIT_LO(byte);
}
}
/*
=for apidoc valid_utf8_to_uvchr
Like C>, but should only be called when it is
known that the next character in the input UTF-8 string C is well-formed
(I, it passes C>. Surrogates, non-character code
points, and non-Unicode code points are allowed.
=cut
*/
PERL_STATIC_INLINE UV
Perl_valid_utf8_to_uvchr(const U8 *s, STRLEN *retlen)
{
const UV expectlen = UTF8SKIP(s);
const U8* send = s + expectlen;
UV uv = *s;
PERL_ARGS_ASSERT_VALID_UTF8_TO_UVCHR;
if (retlen) {
*retlen = expectlen;
}
/* An invariant is trivially returned */
if (expectlen == 1) {
return uv;
}
/* Remove the leading bits that indicate the number of bytes, leaving just
* the bits that are part of the value */
uv = NATIVE_UTF8_TO_I8(uv) & UTF_START_MASK(expectlen);
/* Now, loop through the remaining bytes, accumulating each into the
* working total as we go. (I khw tried unrolling the loop for up to 4
* bytes, but there was no performance improvement) */
for (++s; s < send; s++) {
uv = UTF8_ACCUMULATE(uv, *s);
}
return UNI_TO_NATIVE(uv);
}
/*
=for apidoc is_utf8_invariant_string
Returns TRUE if the first C bytes of the string C are the same
regardless of the UTF-8 encoding of the string (or UTF-EBCDIC encoding on
EBCDIC machines); otherwise it returns FALSE. That is, it returns TRUE if they
are UTF-8 invariant. On ASCII-ish machines, all the ASCII characters and only
the ASCII characters fit this definition. On EBCDIC machines, the ASCII-range
characters are invariant, but so also are the C1 controls.
If C is 0, it will be calculated using C, (which means if you
use this option, that C can't have embedded C characters and has to
have a terminating C byte).
See also
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
and
C>.
=cut
*/
#define is_utf8_invariant_string(s, len) \
is_utf8_invariant_string_loc(s, len, NULL)
/*
=for apidoc is_utf8_invariant_string_loc
Like C> but upon failure, stores the location of
the first UTF-8 variant character in the C pointer; if all characters are
UTF-8 invariant, this function does not change the contents of C<*ep>.
=cut
*/
PERL_STATIC_INLINE bool
Perl_is_utf8_invariant_string_loc(const U8* const s, STRLEN len, const U8 ** ep)
{
const U8* send;
const U8* x = s;
PERL_ARGS_ASSERT_IS_UTF8_INVARIANT_STRING_LOC;
if (len == 0) {
len = strlen((const char *)s);
}
send = s + len;
/* This looks like 0x010101... */
# define PERL_COUNT_MULTIPLIER (~ (UINTMAX_C(0)) / 0xFF)
/* This looks like 0x808080... */
# define PERL_VARIANTS_WORD_MASK (PERL_COUNT_MULTIPLIER * 0x80)
# define PERL_WORDSIZE sizeof(PERL_UINTMAX_T)
# define PERL_WORD_BOUNDARY_MASK (PERL_WORDSIZE - 1)
/* Evaluates to 0 if 'x' is at a word boundary; otherwise evaluates to 1, by
* or'ing together the lowest bits of 'x'. Hopefully the final term gets
* optimized out completely on a 32-bit system, and its mask gets optimized out
* on a 64-bit system */
# define PERL_IS_SUBWORD_ADDR(x) (1 & ( PTR2nat(x) \
| ( PTR2nat(x) >> 1) \
| ( ( (PTR2nat(x) \
& PERL_WORD_BOUNDARY_MASK) >> 2))))
#ifndef EBCDIC
/* Do the word-at-a-time iff there is at least one usable full word. That
* means that after advancing to a word boundary, there still is at least a
* full word left. The number of bytes needed to advance is 'wordsize -
* offset' unless offset is 0. */
if ((STRLEN) (send - x) >= PERL_WORDSIZE
/* This term is wordsize if subword; 0 if not */
+ PERL_WORDSIZE * PERL_IS_SUBWORD_ADDR(x)
/* 'offset' */
- (PTR2nat(x) & PERL_WORD_BOUNDARY_MASK))
{
/* Process per-byte until reach word boundary. XXX This loop could be
* eliminated if we knew that this platform had fast unaligned reads */
while (PTR2nat(x) & PERL_WORD_BOUNDARY_MASK) {
if (! UTF8_IS_INVARIANT(*x)) {
if (ep) {
*ep = x;
}
return FALSE;
}
x++;
}
/* Here, we know we have at least one full word to process. Process
* per-word as long as we have at least a full word left */
do {
if ((* (PERL_UINTMAX_T *) x) & PERL_VARIANTS_WORD_MASK) {
/* Found a variant. Just return if caller doesn't want its
* exact position */
if (! ep) {
return FALSE;
}
# if BYTEORDER == 0x1234 || BYTEORDER == 0x12345678 \
|| BYTEORDER == 0x4321 || BYTEORDER == 0x87654321
*ep = x + variant_byte_number(* (PERL_UINTMAX_T *) x);
assert(*ep >= s && *ep < send);
return FALSE;
# else /* If weird byte order, drop into next loop to do byte-at-a-time
checks. */
break;
# endif
}
x += PERL_WORDSIZE;
} while (x + PERL_WORDSIZE <= send);
}
#endif /* End of ! EBCDIC */
/* Process per-byte */
while (x < send) {
if (! UTF8_IS_INVARIANT(*x)) {
if (ep) {
*ep = x;
}
return FALSE;
}
x++;
}
return TRUE;
}
#ifndef EBCDIC
PERL_STATIC_INLINE unsigned int
Perl_variant_byte_number(PERL_UINTMAX_T word)
{
/* This returns the position in a word (0..7) of the first variant byte in
* it. This is a helper function. Note that there are no branches */
assert(word);
/* Get just the msb bits of each byte */
word &= PERL_VARIANTS_WORD_MASK;
# if BYTEORDER == 0x1234 || BYTEORDER == 0x12345678
/* Bytes are stored like
* Byte8 ... Byte2 Byte1
* 63..56...15...8 7...0
*
* Isolate the lsb;
* https://stackoverflow.com/questions/757059/position-of-least-significant-bit-that-is-set
*
* The word will look like this, with a rightmost set bit in position 's':
* ('x's are don't cares)
* s
* x..x100..0
* x..xx10..0 Right shift (rightmost 0 is shifted off)
* x..xx01..1 Subtract 1, turns all the trailing zeros into 1's and
* the 1 just to their left into a 0; the remainder is
* untouched
* 0..0011..1 The xor with the original, x..xx10..0, clears that
* remainder, sets the bottom to all 1
* 0..0100..0 Add 1 to clear the word except for the bit in 's'
*
* Another method is to do 'word &= -word'; but it generates a compiler
* message on some platforms about taking the negative of an unsigned */
word >>= 1;
word = 1 + (word ^ (word - 1));
# elif BYTEORDER == 0x4321 || BYTEORDER == 0x87654321
/* Bytes are stored like
* Byte1 Byte2 ... Byte8
* 63..56 55..47 ... 7...0
*
* Isolate the msb; http://codeforces.com/blog/entry/10330
*
* Only the most significant set bit matters. Or'ing word with its right
* shift of 1 makes that bit and the next one to its right both 1. Then
* right shifting by 2 makes for 4 1-bits in a row. ... We end with the
* msb and all to the right being 1. */
word |= word >> 1;
word |= word >> 2;
word |= word >> 4;
word |= word >> 8;
word |= word >> 16;
word |= word >> 32; /* This should get optimized out on 32-bit systems. */
/* Then subtracting the right shift by 1 clears all but the left-most of
* the 1 bits, which is our desired result */
word -= (word >> 1);
# else
# error Unexpected byte order
# endif
/* Here 'word' has a single bit set: the msb of the first byte in which it
* is set. Calculate that position in the word. We can use this
* specialized solution: https://stackoverflow.com/a/32339674/1626653,
* assumes an 8-bit byte. (On a 32-bit machine, the larger numbers should
* just get shifted off at compile time) */
word = (word >> 7) * ((UINTMAX_C( 7) << 56) | (UINTMAX_C(15) << 48)
| (UINTMAX_C(23) << 40) | (UINTMAX_C(31) << 32)
| (39 << 24) | (47 << 16)
| (55 << 8) | (63 << 0));
word >>= PERL_WORDSIZE * 7; /* >> by either 56 or 24 */
/* Here, word contains the position 7..63 of that bit. Convert to 0..7 */
word = ((word + 1) >> 3) - 1;
# if BYTEORDER == 0x4321 || BYTEORDER == 0x87654321
/* And invert the result */
word = CHARBITS - word - 1;
# endif
return (unsigned int) word;
}
#endif
#if defined(PERL_CORE) || defined(PERL_EXT)
/*
=for apidoc variant_under_utf8_count
This function looks at the sequence of bytes between C and C, which are
assumed to be encoded in ASCII/Latin1, and returns how many of them would
change should the string be translated into UTF-8. Due to the nature of UTF-8,
each of these would occupy two bytes instead of the single one in the input
string. Thus, this function returns the precise number of bytes the string
would expand by when translated to UTF-8.
Unlike most of the other functions that have C in their name, the input
to this function is NOT a UTF-8-encoded string. The function name is slightly
I to emphasize this.
This function is internal to Perl because khw thinks that any XS code that
would want this is probably operating too close to the internals. Presenting a
valid use case could change that.
See also
C>
and
C>,
=cut
*/
PERL_STATIC_INLINE Size_t
S_variant_under_utf8_count(const U8* const s, const U8* const e)
{
const U8* x = s;
Size_t count = 0;
PERL_ARGS_ASSERT_VARIANT_UNDER_UTF8_COUNT;
# ifndef EBCDIC
/* Test if the string is long enough to use word-at-a-time. (Logic is the
* same as for is_utf8_invariant_string()) */
if ((STRLEN) (e - x) >= PERL_WORDSIZE
+ PERL_WORDSIZE * PERL_IS_SUBWORD_ADDR(x)
- (PTR2nat(x) & PERL_WORD_BOUNDARY_MASK))
{
/* Process per-byte until reach word boundary. XXX This loop could be
* eliminated if we knew that this platform had fast unaligned reads */
while (PTR2nat(x) & PERL_WORD_BOUNDARY_MASK) {
count += ! UTF8_IS_INVARIANT(*x++);
}
/* Process per-word as long as we have at least a full word left */
do { /* Commit 03c1e4ab1d6ee9062fb3f94b0ba31db6698724b1 contains an
explanation of how this works */
PERL_UINTMAX_T increment
= ((((* (PERL_UINTMAX_T *) x) & PERL_VARIANTS_WORD_MASK) >> 7)
* PERL_COUNT_MULTIPLIER)
>> ((PERL_WORDSIZE - 1) * CHARBITS);
count += (Size_t) increment;
x += PERL_WORDSIZE;
} while (x + PERL_WORDSIZE <= e);
}
# endif
/* Process per-byte */
while (x < e) {
if (! UTF8_IS_INVARIANT(*x)) {
count++;
}
x++;
}
return count;
}
#endif
#ifndef PERL_IN_REGEXEC_C /* Keep these around for that file */
# undef PERL_WORDSIZE
# undef PERL_COUNT_MULTIPLIER
# undef PERL_WORD_BOUNDARY_MASK
# undef PERL_VARIANTS_WORD_MASK
#endif
/*
=for apidoc is_utf8_string
Returns TRUE if the first C bytes of string C form a valid
Perl-extended-UTF-8 string; returns FALSE otherwise. If C is 0, it will
be calculated using C (which means if you use this option, that C
can't have embedded C characters and has to have a terminating C
byte). Note that all characters being ASCII constitute 'a valid UTF-8 string'.
This function considers Perl's extended UTF-8 to be valid. That means that
code points above Unicode, surrogates, and non-character code points are
considered valid by this function. Use C>,
C>, or C> to restrict what
code points are considered valid.
See also
C>,
C>,
C>,
C>,
C>,
C>,
C>,
=cut
*/
#define is_utf8_string(s, len) is_utf8_string_loclen(s, len, NULL, NULL)
#if defined(PERL_CORE) || defined (PERL_EXT)
/*
=for apidoc is_utf8_non_invariant_string
Returns TRUE if L returns FALSE for the first
C bytes of the string C, but they are, nonetheless, legal Perl-extended
UTF-8; otherwise returns FALSE.
A TRUE return means that at least one code point represented by the sequence
either is a wide character not representable as a single byte, or the
representation differs depending on whether the sequence is encoded in UTF-8 or
not.
See also
C>,
C>
=cut
This is commonly used to determine if a SV's UTF-8 flag should be turned on.
It generally needn't be if its string is entirely UTF-8 invariant, and it
shouldn't be if it otherwise contains invalid UTF-8.
It is an internal function because khw thinks that XS code shouldn't be working
at this low a level. A valid use case could change that.
*/
PERL_STATIC_INLINE bool
Perl_is_utf8_non_invariant_string(const U8* const s, STRLEN len)
{
const U8 * first_variant;
PERL_ARGS_ASSERT_IS_UTF8_NON_INVARIANT_STRING;
if (is_utf8_invariant_string_loc(s, len, &first_variant)) {
return FALSE;
}
return is_utf8_string(first_variant, len - (first_variant - s));
}
#endif
/*
=for apidoc is_strict_utf8_string
Returns TRUE if the first C bytes of string C form a valid
UTF-8-encoded string that is fully interchangeable by any application using
Unicode rules; otherwise it returns FALSE. If C is 0, it will be
calculated using C (which means if you use this option, that C
can't have embedded C characters and has to have a terminating C
byte). Note that all characters being ASCII constitute 'a valid UTF-8 string'.
This function returns FALSE for strings containing any
code points above the Unicode max of 0x10FFFF, surrogate code points, or
non-character code points.
See also
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
and
C>.
=cut
*/
#define is_strict_utf8_string(s, len) is_strict_utf8_string_loclen(s, len, NULL, NULL)
/*
=for apidoc is_c9strict_utf8_string
Returns TRUE if the first C bytes of string C form a valid
UTF-8-encoded string that conforms to
L;
otherwise it returns FALSE. If C is 0, it will be calculated using
C (which means if you use this option, that C can't have embedded
C characters and has to have a terminating C byte). Note that all
characters being ASCII constitute 'a valid UTF-8 string'.
This function returns FALSE for strings containing any code points above the
Unicode max of 0x10FFFF or surrogate code points, but accepts non-character
code points per
L.
See also
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
and
C>.
=cut
*/
#define is_c9strict_utf8_string(s, len) is_c9strict_utf8_string_loclen(s, len, NULL, 0)
/*
=for apidoc is_utf8_string_flags
Returns TRUE if the first C bytes of string C form a valid
UTF-8 string, subject to the restrictions imposed by C;
returns FALSE otherwise. If C is 0, it will be calculated
using C (which means if you use this option, that C can't have
embedded C characters and has to have a terminating C byte). Note
that all characters being ASCII constitute 'a valid UTF-8 string'.
If C is 0, this gives the same results as C>; if
C is C, this gives the same results
as C>; and if C is
C, this gives the same results as
C>. Otherwise C may be any
combination of the C> flags understood by
C>, with the same meanings.
See also
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
C>,
and
C>.
=cut
*/
PERL_STATIC_INLINE bool
Perl_is_utf8_string_flags(const U8 *s, STRLEN len, const U32 flags)
{
const U8 * first_variant;
PERL_ARGS_ASSERT_IS_UTF8_STRING_FLAGS;
assert(0 == (flags & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE
|UTF8_DISALLOW_PERL_EXTENDED)));
if (len == 0) {
len = strlen((const char *)s);
}
if (flags == 0) {
return is_utf8_string(s, len);
}
if ((flags & ~UTF8_DISALLOW_PERL_EXTENDED)
== UTF8_DISALLOW_ILLEGAL_INTERCHANGE)
{
return is_strict_utf8_string(s, len);
}
if ((flags & ~UTF8_DISALLOW_PERL_EXTENDED)
== UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE)
{
return is_c9strict_utf8_string(s, len);
}
if (! is_utf8_invariant_string_loc(s, len, &first_variant)) {
const U8* const send = s + len;
const U8* x = first_variant;
while (x < send) {
STRLEN cur_len = isUTF8_CHAR_flags(x, send, flags);
if (UNLIKELY(! cur_len)) {
return FALSE;
}
x += cur_len;
}
}
return TRUE;
}
/*
=for apidoc is_utf8_string_loc
Like C> but stores the location of the failure (in the
case of "utf8ness failure") or the location C+C (in the case of
"utf8ness success") in the C pointer.
See also C>.
=cut
*/
#define is_utf8_string_loc(s, len, ep) is_utf8_string_loclen(s, len, ep, 0)
/*
=for apidoc is_utf8_string_loclen
Like C> but stores the location of the failure (in the
case of "utf8ness failure") or the location C+C (in the case of
"utf8ness success") in the C pointer, and the number of UTF-8
encoded characters in the C pointer.
See also C>.
=cut
*/
PERL_STATIC_INLINE bool
Perl_is_utf8_string_loclen(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el)
{
const U8 * first_variant;
PERL_ARGS_ASSERT_IS_UTF8_STRING_LOCLEN;
if (len == 0) {
len = strlen((const char *) s);
}
if (is_utf8_invariant_string_loc(s, len, &first_variant)) {
if (el)
*el = len;
if (ep) {
*ep = s + len;
}
return TRUE;
}
{
const U8* const send = s + len;
const U8* x = first_variant;
STRLEN outlen = first_variant - s;
while (x < send) {
const STRLEN cur_len = isUTF8_CHAR(x, send);
if (UNLIKELY(! cur_len)) {
break;
}
x += cur_len;
outlen++;
}
if (el)
*el = outlen;
if (ep) {
*ep = x;
}
return (x == send);
}
}
/*
=for apidoc isUTF8_CHAR
Evaluates to non-zero if the first few bytes of the string starting at C and
looking no further than S> are well-formed UTF-8, as extended by Perl,
that represents some code point; otherwise it evaluates to 0. If non-zero, the
value gives how many bytes starting at C comprise the code point's
representation. Any bytes remaining before C, but beyond the ones needed to
form the first code point in C, are not examined.
The code point can be any that will fit in an IV on this machine, using Perl's
extension to official UTF-8 to represent those higher than the Unicode maximum
of 0x10FFFF. That means that this macro is used to efficiently decide if the
next few bytes in C is legal UTF-8 for a single character.
Use C> to restrict the acceptable code points to those
defined by Unicode to be fully interchangeable across applications;
C> to use the L definition of allowable
code points; and C> for a more customized definition.
Use C>, C>, and
C> to check entire strings.
Note also that a UTF-8 "invariant" character (i.e. ASCII on non-EBCDIC
machines) is a valid UTF-8 character.
=cut
This uses an adaptation of the table and algorithm given in
https://bjoern.hoehrmann.de/utf-8/decoder/dfa/, which provides comprehensive
documentation of the original version. A copyright notice for the original
version is given at the beginning of this file. The Perl adapation is
documented at the definition of PL_extended_utf8_dfa_tab[].
*/
PERL_STATIC_INLINE Size_t
Perl_isUTF8_CHAR(const U8 * const s0, const U8 * const e)
{
const U8 * s = s0;
UV state = 0;
PERL_ARGS_ASSERT_ISUTF8_CHAR;
/* This dfa is fast. If it accepts the input, it was for a well-formed,
* code point, which can be returned immediately. Otherwise, it is either
* malformed, or for the start byte FF which the dfa doesn't handle (except
* on 32-bit ASCII platforms where it trivially is an error). Call a
* helper function for the other platforms. */
while (s < e && LIKELY(state != 1)) {
state = PL_extended_utf8_dfa_tab[256
+ state
+ PL_extended_utf8_dfa_tab[*s]];
if (state != 0) {
s++;
continue;
}
return s - s0 + 1;
}
#if defined(UV_IS_QUAD) || defined(EBCDIC)
if (NATIVE_UTF8_TO_I8(*s0) == 0xFF && e - s0 >= UTF8_MAXBYTES) {
return is_utf8_char_helper(s0, e, 0);
}
#endif
return 0;
}
/*
=for apidoc isSTRICT_UTF8_CHAR
Evaluates to non-zero if the first few bytes of the string starting at C and
looking no further than S> are well-formed UTF-8 that represents some
Unicode code point completely acceptable for open interchange between all
applications; otherwise it evaluates to 0. If non-zero, the value gives how
many bytes starting at C comprise the code point's representation. Any
bytes remaining before C, but beyond the ones needed to form the first code
point in C, are not examined.
The largest acceptable code point is the Unicode maximum 0x10FFFF, and must not
be a surrogate nor a non-character code point. Thus this excludes any code
point from Perl's extended UTF-8.
This is used to efficiently decide if the next few bytes in C is
legal Unicode-acceptable UTF-8 for a single character.
Use C> to use the L definition of allowable
code points; C> to check for Perl's extended UTF-8;
and C> for a more customized definition.
Use C>, C>, and
C> to check entire strings.
=cut
This uses an adaptation of the tables and algorithm given in
https://bjoern.hoehrmann.de/utf-8/decoder/dfa/, which provides comprehensive
documentation of the original version. A copyright notice for the original
version is given at the beginning of this file. The Perl adapation is
documented at the definition of strict_extended_utf8_dfa_tab[].
*/
PERL_STATIC_INLINE Size_t
Perl_isSTRICT_UTF8_CHAR(const U8 * const s0, const U8 * const e)
{
const U8 * s = s0;
UV state = 0;
PERL_ARGS_ASSERT_ISSTRICT_UTF8_CHAR;
while (s < e && LIKELY(state != 1)) {
state = PL_strict_utf8_dfa_tab[256 + state + PL_strict_utf8_dfa_tab[*s]];
if (state != 0) {
s++;
continue;
}
return s - s0 + 1;
}
#ifndef EBCDIC
/* The dfa above drops out for certain Hanguls; handle them specially */
if (is_HANGUL_ED_utf8_safe(s0, e)) {
return 3;
}
#endif
return 0;
}
/*
=for apidoc isC9_STRICT_UTF8_CHAR
Evaluates to non-zero if the first few bytes of the string starting at C and
looking no further than S> are well-formed UTF-8 that represents some
Unicode non-surrogate code point; otherwise it evaluates to 0. If non-zero,
the value gives how many bytes starting at C comprise the code point's
representation. Any bytes remaining before C, but beyond the ones needed to
form the first code point in C, are not examined.
The largest acceptable code point is the Unicode maximum 0x10FFFF. This
differs from C> only in that it accepts non-character
code points. This corresponds to
L.
which said that non-character code points are merely discouraged rather than
completely forbidden in open interchange. See
L.
Use C> to check for Perl's extended UTF-8; and
C> for a more customized definition.
Use C>, C>, and
C> to check entire strings.
=cut
This uses an adaptation of the tables and algorithm given in
https://bjoern.hoehrmann.de/utf-8/decoder/dfa/, which provides comprehensive
documentation of the original version. A copyright notice for the original
version is given at the beginning of this file. The Perl adapation is
documented at the definition of PL_c9_utf8_dfa_tab[].
*/
PERL_STATIC_INLINE Size_t
Perl_isC9_STRICT_UTF8_CHAR(const U8 * const s0, const U8 * const e)
{
const U8 * s = s0;
UV state = 0;
PERL_ARGS_ASSERT_ISC9_STRICT_UTF8_CHAR;
while (s < e && LIKELY(state != 1)) {
state = PL_c9_utf8_dfa_tab[256 + state + PL_c9_utf8_dfa_tab[*s]];
if (state != 0) {
s++;
continue;
}
return s - s0 + 1;
}
return 0;
}
/*
=for apidoc is_strict_utf8_string_loc
Like C> but stores the location of the failure (in the
case of "utf8ness failure") or the location C+C (in the case of
"utf8ness success") in the C pointer.
See also C>.
=cut
*/
#define is_strict_utf8_string_loc(s, len, ep) \
is_strict_utf8_string_loclen(s, len, ep, 0)
/*
=for apidoc is_strict_utf8_string_loclen
Like C> but stores the location of the failure (in the
case of "utf8ness failure") or the location C+C (in the case of
"utf8ness success") in the C pointer, and the number of UTF-8
encoded characters in the C pointer.
See also C>.
=cut
*/
PERL_STATIC_INLINE bool
Perl_is_strict_utf8_string_loclen(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el)
{
const U8 * first_variant;
PERL_ARGS_ASSERT_IS_STRICT_UTF8_STRING_LOCLEN;
if (len == 0) {
len = strlen((const char *) s);
}
if (is_utf8_invariant_string_loc(s, len, &first_variant)) {
if (el)
*el = len;
if (ep) {
*ep = s + len;
}
return TRUE;
}
{
const U8* const send = s + len;
const U8* x = first_variant;
STRLEN outlen = first_variant - s;
while (x < send) {
const STRLEN cur_len = isSTRICT_UTF8_CHAR(x, send);
if (UNLIKELY(! cur_len)) {
break;
}
x += cur_len;
outlen++;
}
if (el)
*el = outlen;
if (ep) {
*ep = x;
}
return (x == send);
}
}
/*
=for apidoc is_c9strict_utf8_string_loc
Like C> but stores the location of the failure (in
the case of "utf8ness failure") or the location C+C (in the case of
"utf8ness success") in the C pointer.
See also C>.
=cut
*/
#define is_c9strict_utf8_string_loc(s, len, ep) \
is_c9strict_utf8_string_loclen(s, len, ep, 0)
/*
=for apidoc is_c9strict_utf8_string_loclen
Like C> but stores the location of the failure (in
the case of "utf8ness failure") or the location C+C (in the case of
"utf8ness success") in the C pointer, and the number of UTF-8 encoded
characters in the C pointer.
See also C>.
=cut
*/
PERL_STATIC_INLINE bool
Perl_is_c9strict_utf8_string_loclen(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el)
{
const U8 * first_variant;
PERL_ARGS_ASSERT_IS_C9STRICT_UTF8_STRING_LOCLEN;
if (len == 0) {
len = strlen((const char *) s);
}
if (is_utf8_invariant_string_loc(s, len, &first_variant)) {
if (el)
*el = len;
if (ep) {
*ep = s + len;
}
return TRUE;
}
{
const U8* const send = s + len;
const U8* x = first_variant;
STRLEN outlen = first_variant - s;
while (x < send) {
const STRLEN cur_len = isC9_STRICT_UTF8_CHAR(x, send);
if (UNLIKELY(! cur_len)) {
break;
}
x += cur_len;
outlen++;
}
if (el)
*el = outlen;
if (ep) {
*ep = x;
}
return (x == send);
}
}
/*
=for apidoc is_utf8_string_loc_flags
Like C> but stores the location of the failure (in the
case of "utf8ness failure") or the location C+C (in the case of
"utf8ness success") in the C pointer.
See also C>.
=cut
*/
#define is_utf8_string_loc_flags(s, len, ep, flags) \
is_utf8_string_loclen_flags(s, len, ep, 0, flags)
/* The above 3 actual functions could have been moved into the more general one
* just below, and made #defines that call it with the right 'flags'. They are
* currently kept separate to increase their chances of getting inlined */
/*
=for apidoc is_utf8_string_loclen_flags
Like C> but stores the location of the failure (in the
case of "utf8ness failure") or the location C+C (in the case of
"utf8ness success") in the C pointer, and the number of UTF-8
encoded characters in the C pointer.
See also C>.
=cut
*/
PERL_STATIC_INLINE bool
Perl_is_utf8_string_loclen_flags(const U8 *s, STRLEN len, const U8 **ep, STRLEN *el, const U32 flags)
{
const U8 * first_variant;
PERL_ARGS_ASSERT_IS_UTF8_STRING_LOCLEN_FLAGS;
assert(0 == (flags & ~(UTF8_DISALLOW_ILLEGAL_INTERCHANGE
|UTF8_DISALLOW_PERL_EXTENDED)));
if (len == 0) {
len = strlen((const char *) s);
}
if (flags == 0) {
return is_utf8_string_loclen(s, len, ep, el);
}
if ((flags & ~UTF8_DISALLOW_PERL_EXTENDED)
== UTF8_DISALLOW_ILLEGAL_INTERCHANGE)
{
return is_strict_utf8_string_loclen(s, len, ep, el);
}
if ((flags & ~UTF8_DISALLOW_PERL_EXTENDED)
== UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE)
{
return is_c9strict_utf8_string_loclen(s, len, ep, el);
}
if (is_utf8_invariant_string_loc(s, len, &first_variant)) {
if (el)
*el = len;
if (ep) {
*ep = s + len;
}
return TRUE;
}
{
const U8* send = s + len;
const U8* x = first_variant;
STRLEN outlen = first_variant - s;
while (x < send) {
const STRLEN cur_len = isUTF8_CHAR_flags(x, send, flags);
if (UNLIKELY(! cur_len)) {
break;
}
x += cur_len;
outlen++;
}
if (el)
*el = outlen;
if (ep) {
*ep = x;
}
return (x == send);
}
}
/*
=for apidoc utf8_distance
Returns the number of UTF-8 characters between the UTF-8 pointers C
and C.
WARNING: use only if you *know* that the pointers point inside the
same UTF-8 buffer.
=cut
*/
PERL_STATIC_INLINE IV
Perl_utf8_distance(pTHX_ const U8 *a, const U8 *b)
{
PERL_ARGS_ASSERT_UTF8_DISTANCE;
return (a < b) ? -1 * (IV) utf8_length(a, b) : (IV) utf8_length(b, a);
}
/*
=for apidoc utf8_hop
Return the UTF-8 pointer C displaced by C characters, either
forward or backward.
WARNING: do not use the following unless you *know* C is within
the UTF-8 data pointed to by C *and* that on entry C is aligned
on the first byte of character or just after the last byte of a character.
=cut
*/
PERL_STATIC_INLINE U8 *
Perl_utf8_hop(const U8 *s, SSize_t off)
{
PERL_ARGS_ASSERT_UTF8_HOP;
/* Note: cannot use UTF8_IS_...() too eagerly here since e.g
* the bitops (especially ~) can create illegal UTF-8.
* In other words: in Perl UTF-8 is not just for Unicode. */
if (off >= 0) {
while (off--)
s += UTF8SKIP(s);
}
else {
while (off++) {
s--;
while (UTF8_IS_CONTINUATION(*s))
s--;
}
}
GCC_DIAG_IGNORE(-Wcast-qual)
return (U8 *)s;
GCC_DIAG_RESTORE
}
/*
=for apidoc utf8_hop_forward
Return the UTF-8 pointer C displaced by up to C characters,
forward.
C must be non-negative.
C must be before or equal to C.
When moving forward it will not move beyond C.
Will not exceed this limit even if the string is not valid "UTF-8".
=cut
*/
PERL_STATIC_INLINE U8 *
Perl_utf8_hop_forward(const U8 *s, SSize_t off, const U8 *end)
{
PERL_ARGS_ASSERT_UTF8_HOP_FORWARD;
/* Note: cannot use UTF8_IS_...() too eagerly here since e.g
* the bitops (especially ~) can create illegal UTF-8.
* In other words: in Perl UTF-8 is not just for Unicode. */
assert(s <= end);
assert(off >= 0);
while (off--) {
STRLEN skip = UTF8SKIP(s);
if ((STRLEN)(end - s) <= skip) {
GCC_DIAG_IGNORE(-Wcast-qual)
return (U8 *)end;
GCC_DIAG_RESTORE
}
s += skip;
}
GCC_DIAG_IGNORE(-Wcast-qual)
return (U8 *)s;
GCC_DIAG_RESTORE
}
/*
=for apidoc utf8_hop_back
Return the UTF-8 pointer C displaced by up to C characters,
backward.
C must be non-positive.
C must be after or equal to C.
When moving backward it will not move before C.
Will not exceed this limit even if the string is not valid "UTF-8".
=cut
*/
PERL_STATIC_INLINE U8 *
Perl_utf8_hop_back(const U8 *s, SSize_t off, const U8 *start)
{
PERL_ARGS_ASSERT_UTF8_HOP_BACK;
/* Note: cannot use UTF8_IS_...() too eagerly here since e.g
* the bitops (especially ~) can create illegal UTF-8.
* In other words: in Perl UTF-8 is not just for Unicode. */
assert(start <= s);
assert(off <= 0);
while (off++ && s > start) {
do {
s--;
} while (UTF8_IS_CONTINUATION(*s) && s > start);
}
GCC_DIAG_IGNORE(-Wcast-qual)
return (U8 *)s;
GCC_DIAG_RESTORE
}
/*
=for apidoc utf8_hop_safe
Return the UTF-8 pointer C displaced by up to C characters,
either forward or backward.
When moving backward it will not move before C.
When moving forward it will not move beyond C.
Will not exceed those limits even if the string is not valid "UTF-8".
=cut
*/
PERL_STATIC_INLINE U8 *
Perl_utf8_hop_safe(const U8 *s, SSize_t off, const U8 *start, const U8 *end)
{
PERL_ARGS_ASSERT_UTF8_HOP_SAFE;
/* Note: cannot use UTF8_IS_...() too eagerly here since e.g
* the bitops (especially ~) can create illegal UTF-8.
* In other words: in Perl UTF-8 is not just for Unicode. */
assert(start <= s && s <= end);
if (off >= 0) {
return utf8_hop_forward(s, off, end);
}
else {
return utf8_hop_back(s, off, start);
}
}
/*
=for apidoc is_utf8_valid_partial_char
Returns 0 if the sequence of bytes starting at C and looking no further than
S> is the UTF-8 encoding, as extended by Perl, for one or more code
points. Otherwise, it returns 1 if there exists at least one non-empty
sequence of bytes that when appended to sequence C, starting at position
C causes the entire sequence to be the well-formed UTF-8 of some code point;
otherwise returns 0.
In other words this returns TRUE if C