mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-18 10:35:55 +00:00
Code Issues Releases Activity
f1422f2ebc
freebsd/contrib/perl5/utf8.c
Mark Murray 120a02d4f3 Vendor import of Perl 5.006
2000-06-25 11:04:01 +00:00

857 lines
19 KiB
C
Raw Blame History

/* utf8.c
*
* Copyright (c) 1998-2000, 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.
*
*/
/*
* 'What a fix!' said Sam. 'That's the one place in all the lands we've ever
* heard of that we don't want to see any closer; and that's the one place
* we're trying to get to! And that's just where we can't get, nohow.'
*
* 'Well do I understand your speech,' he answered in the same language;
* 'yet few strangers do so. Why then do you not speak in the Common Tongue,
* as is the custom in the West, if you wish to be answered?'
*
* ...the travellers perceived that the floor was paved with stones of many
* hues; branching runes and strange devices intertwined beneath their feet.
*/
#include "EXTERN.h"
#define PERL_IN_UTF8_C
#include "perl.h"
/* Unicode support */
U8 *
Perl_uv_to_utf8(pTHX_ U8 *d, UV uv)
{
if (uv < 0x80) {
*d++ = uv;
return d;
}
if (uv < 0x800) {
*d++ = (( uv >> 6) | 0xc0);
*d++ = (( uv & 0x3f) | 0x80);
return d;
}
if (uv < 0x10000) {
*d++ = (( uv >> 12) | 0xe0);
*d++ = (((uv >> 6) & 0x3f) | 0x80);
*d++ = (( uv & 0x3f) | 0x80);
return d;
}
if (uv < 0x200000) {
*d++ = (( uv >> 18) | 0xf0);
*d++ = (((uv >> 12) & 0x3f) | 0x80);
*d++ = (((uv >> 6) & 0x3f) | 0x80);
*d++ = (( uv & 0x3f) | 0x80);
return d;
}
if (uv < 0x4000000) {
*d++ = (( uv >> 24) | 0xf8);
*d++ = (((uv >> 18) & 0x3f) | 0x80);
*d++ = (((uv >> 12) & 0x3f) | 0x80);
*d++ = (((uv >> 6) & 0x3f) | 0x80);
*d++ = (( uv & 0x3f) | 0x80);
return d;
}
if (uv < 0x80000000) {
*d++ = (( uv >> 30) | 0xfc);
*d++ = (((uv >> 24) & 0x3f) | 0x80);
*d++ = (((uv >> 18) & 0x3f) | 0x80);
*d++ = (((uv >> 12) & 0x3f) | 0x80);
*d++ = (((uv >> 6) & 0x3f) | 0x80);
*d++ = (( uv & 0x3f) | 0x80);
return d;
}
#ifdef HAS_QUAD
if (uv < 0x1000000000LL)
#endif
{
*d++ = 0xfe; /* Can't match U+FEFF! */
*d++ = (((uv >> 30) & 0x3f) | 0x80);
*d++ = (((uv >> 24) & 0x3f) | 0x80);
*d++ = (((uv >> 18) & 0x3f) | 0x80);
*d++ = (((uv >> 12) & 0x3f) | 0x80);
*d++ = (((uv >> 6) & 0x3f) | 0x80);
*d++ = (( uv & 0x3f) | 0x80);
return d;
}
#ifdef HAS_QUAD
{
*d++ = 0xff; /* Can't match U+FFFE! */
*d++ = 0x80; /* 6 Reserved bits */
*d++ = (((uv >> 60) & 0x0f) | 0x80); /* 2 Reserved bits */
*d++ = (((uv >> 54) & 0x3f) | 0x80);
*d++ = (((uv >> 48) & 0x3f) | 0x80);
*d++ = (((uv >> 42) & 0x3f) | 0x80);
*d++ = (((uv >> 36) & 0x3f) | 0x80);
*d++ = (((uv >> 30) & 0x3f) | 0x80);
*d++ = (((uv >> 24) & 0x3f) | 0x80);
*d++ = (((uv >> 18) & 0x3f) | 0x80);
*d++ = (((uv >> 12) & 0x3f) | 0x80);
*d++ = (((uv >> 6) & 0x3f) | 0x80);
*d++ = (( uv & 0x3f) | 0x80);
return d;
}
#endif
}
/* Tests if some arbitrary number of bytes begins in a valid UTF-8 character.
* The actual number of bytes in the UTF-8 character will be returned if it
* is valid, otherwise 0. */
int
Perl_is_utf8_char(pTHX_ U8 *s)
{
U8 u = *s;
int slen, len;
if (!(u & 0x80))
return 1;
if (!(u & 0x40))
return 0;
if (!(u & 0x20)) { len = 2; }
else if (!(u & 0x10)) { len = 3; }
else if (!(u & 0x08)) { len = 4; }
else if (!(u & 0x04)) { len = 5; }
else if (!(u & 0x02)) { len = 6; }
else if (!(u & 0x01)) { len = 7; }
else { len = 13; } /* whoa! */
slen = len - 1;
s++;
while (slen--) {
if ((*s & 0xc0) != 0x80)
return 0;
s++;
}
return len;
}
UV
Perl_utf8_to_uv(pTHX_ U8* s, I32* retlen)
{
UV uv = *s;
int len;
if (!(uv & 0x80)) {
if (retlen)
*retlen = 1;
return *s;
}
if (!(uv & 0x40)) {
dTHR;
if (ckWARN_d(WARN_UTF8))
Perl_warner(aTHX_ WARN_UTF8, "Malformed UTF-8 character");
if (retlen)
*retlen = 1;
return *s;
}
if (!(uv & 0x20)) { len = 2; uv &= 0x1f; }
else if (!(uv & 0x10)) { len = 3; uv &= 0x0f; }
else if (!(uv & 0x08)) { len = 4; uv &= 0x07; }
else if (!(uv & 0x04)) { len = 5; uv &= 0x03; }
else if (!(uv & 0x02)) { len = 6; uv &= 0x01; }
else if (!(uv & 0x01)) { len = 7; uv = 0; }
else { len = 13; uv = 0; } /* whoa! */
if (retlen)
*retlen = len;
--len;
s++;
while (len--) {
if ((*s & 0xc0) != 0x80) {
dTHR;
if (ckWARN_d(WARN_UTF8))
Perl_warner(aTHX_ WARN_UTF8, "Malformed UTF-8 character");
if (retlen)
*retlen -= len + 1;
return 0xfffd;
}
else
uv = (uv << 6) | (*s++ & 0x3f);
}
return uv;
}
/* utf8_distance(a,b) is intended to be a - b in pointer arithmetic */
I32
Perl_utf8_distance(pTHX_ U8 *a, U8 *b)
{
I32 off = 0;
if (a < b) {
while (a < b) {
a += UTF8SKIP(a);
off--;
}
}
else {
while (b < a) {
b += UTF8SKIP(b);
off++;
}
}
return off;
}
/* WARNING: do not use the following unless you *know* off is within bounds */
U8 *
Perl_utf8_hop(pTHX_ U8 *s, I32 off)
{
if (off >= 0) {
while (off--)
s += UTF8SKIP(s);
}
else {
while (off++) {
s--;
if (*s & 0x80) {
while ((*s & 0xc0) == 0x80)
s--;
}
}
}
return s;
}
/* XXX NOTHING CALLS THE FOLLOWING TWO ROUTINES YET!!! */
/*
* Convert native or reversed UTF-16 to UTF-8.
*
* Destination must be pre-extended to 3/2 source. Do not use in-place.
* We optimize for native, for obvious reasons. */
U8*
Perl_utf16_to_utf8(pTHX_ U16* p, U8* d, I32 bytelen)
{
U16* pend = p + bytelen / 2;
while (p < pend) {
UV uv = *p++;
if (uv < 0x80) {
*d++ = uv;
continue;
}
if (uv < 0x800) {
*d++ = (( uv >> 6) | 0xc0);
*d++ = (( uv & 0x3f) | 0x80);
continue;
}
if (uv >= 0xd800 && uv < 0xdbff) { /* surrogates */
dTHR;
int low = *p++;
if (low < 0xdc00 || low >= 0xdfff) {
if (ckWARN_d(WARN_UTF8))
Perl_warner(aTHX_ WARN_UTF8, "Malformed UTF-16 surrogate");
p--;
uv = 0xfffd;
}
uv = ((uv - 0xd800) << 10) + (low - 0xdc00) + 0x10000;
}
if (uv < 0x10000) {
*d++ = (( uv >> 12) | 0xe0);
*d++ = (((uv >> 6) & 0x3f) | 0x80);
*d++ = (( uv & 0x3f) | 0x80);
continue;
}
else {
*d++ = (( uv >> 18) | 0xf0);
*d++ = (((uv >> 12) & 0x3f) | 0x80);
*d++ = (((uv >> 6) & 0x3f) | 0x80);
*d++ = (( uv & 0x3f) | 0x80);
continue;
}
}
return d;
}
/* Note: this one is slightly destructive of the source. */
U8*
Perl_utf16_to_utf8_reversed(pTHX_ U16* p, U8* d, I32 bytelen)
{
U8* s = (U8*)p;
U8* send = s + bytelen;
while (s < send) {
U8 tmp = s[0];
s[0] = s[1];
s[1] = tmp;
s += 2;
}
return utf16_to_utf8(p, d, bytelen);
}
/* for now these are all defined (inefficiently) in terms of the utf8 versions */
bool
Perl_is_uni_alnum(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_alnum(tmpbuf);
}
bool
Perl_is_uni_alnumc(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_alnumc(tmpbuf);
}
bool
Perl_is_uni_idfirst(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_idfirst(tmpbuf);
}
bool
Perl_is_uni_alpha(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_alpha(tmpbuf);
}
bool
Perl_is_uni_ascii(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_ascii(tmpbuf);
}
bool
Perl_is_uni_space(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_space(tmpbuf);
}
bool
Perl_is_uni_digit(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_digit(tmpbuf);
}
bool
Perl_is_uni_upper(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_upper(tmpbuf);
}
bool
Perl_is_uni_lower(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_lower(tmpbuf);
}
bool
Perl_is_uni_cntrl(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_cntrl(tmpbuf);
}
bool
Perl_is_uni_graph(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_graph(tmpbuf);
}
bool
Perl_is_uni_print(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_print(tmpbuf);
}
bool
Perl_is_uni_punct(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_punct(tmpbuf);
}
bool
Perl_is_uni_xdigit(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return is_utf8_xdigit(tmpbuf);
}
U32
Perl_to_uni_upper(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return to_utf8_upper(tmpbuf);
}
U32
Perl_to_uni_title(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return to_utf8_title(tmpbuf);
}
U32
Perl_to_uni_lower(pTHX_ U32 c)
{
U8 tmpbuf[UTF8_MAXLEN];
uv_to_utf8(tmpbuf, (UV)c);
return to_utf8_lower(tmpbuf);
}
/* for now these all assume no locale info available for Unicode > 255 */
bool
Perl_is_uni_alnum_lc(pTHX_ U32 c)
{
return is_uni_alnum(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_alnumc_lc(pTHX_ U32 c)
{
return is_uni_alnumc(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_idfirst_lc(pTHX_ U32 c)
{
return is_uni_idfirst(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_alpha_lc(pTHX_ U32 c)
{
return is_uni_alpha(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_ascii_lc(pTHX_ U32 c)
{
return is_uni_ascii(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_space_lc(pTHX_ U32 c)
{
return is_uni_space(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_digit_lc(pTHX_ U32 c)
{
return is_uni_digit(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_upper_lc(pTHX_ U32 c)
{
return is_uni_upper(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_lower_lc(pTHX_ U32 c)
{
return is_uni_lower(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_cntrl_lc(pTHX_ U32 c)
{
return is_uni_cntrl(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_graph_lc(pTHX_ U32 c)
{
return is_uni_graph(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_print_lc(pTHX_ U32 c)
{
return is_uni_print(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_punct_lc(pTHX_ U32 c)
{
return is_uni_punct(c); /* XXX no locale support yet */
}
bool
Perl_is_uni_xdigit_lc(pTHX_ U32 c)
{
return is_uni_xdigit(c); /* XXX no locale support yet */
}
U32
Perl_to_uni_upper_lc(pTHX_ U32 c)
{
return to_uni_upper(c); /* XXX no locale support yet */
}
U32
Perl_to_uni_title_lc(pTHX_ U32 c)
{
return to_uni_title(c); /* XXX no locale support yet */
}
U32
Perl_to_uni_lower_lc(pTHX_ U32 c)
{
return to_uni_lower(c); /* XXX no locale support yet */
}
bool
Perl_is_utf8_alnum(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_alnum)
PL_utf8_alnum = swash_init("utf8", "IsAlnum", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_alnum, p);
/* return *p == '_' || is_utf8_alpha(p) || is_utf8_digit(p); */
#ifdef SURPRISINGLY_SLOWER /* probably because alpha is usually true */
if (!PL_utf8_alnum)
PL_utf8_alnum = swash_init("utf8", "",
sv_2mortal(newSVpv("+utf8::IsAlpha\n+utf8::IsDigit\n005F\n",0)), 0, 0);
return swash_fetch(PL_utf8_alnum, p);
#endif
}
bool
Perl_is_utf8_alnumc(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_alnum)
PL_utf8_alnum = swash_init("utf8", "IsAlnumC", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_alnum, p);
/* return is_utf8_alpha(p) || is_utf8_digit(p); */
#ifdef SURPRISINGLY_SLOWER /* probably because alpha is usually true */
if (!PL_utf8_alnum)
PL_utf8_alnum = swash_init("utf8", "",
sv_2mortal(newSVpv("+utf8::IsAlpha\n+utf8::IsDigit\n005F\n",0)), 0, 0);
return swash_fetch(PL_utf8_alnum, p);
#endif
}
bool
Perl_is_utf8_idfirst(pTHX_ U8 *p)
{
return *p == '_' || is_utf8_alpha(p);
}
bool
Perl_is_utf8_alpha(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_alpha)
PL_utf8_alpha = swash_init("utf8", "IsAlpha", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_alpha, p);
}
bool
Perl_is_utf8_ascii(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_ascii)
PL_utf8_ascii = swash_init("utf8", "IsAscii", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_ascii, p);
}
bool
Perl_is_utf8_space(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_space)
PL_utf8_space = swash_init("utf8", "IsSpace", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_space, p);
}
bool
Perl_is_utf8_digit(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_digit)
PL_utf8_digit = swash_init("utf8", "IsDigit", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_digit, p);
}
bool
Perl_is_utf8_upper(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_upper)
PL_utf8_upper = swash_init("utf8", "IsUpper", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_upper, p);
}
bool
Perl_is_utf8_lower(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_lower)
PL_utf8_lower = swash_init("utf8", "IsLower", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_lower, p);
}
bool
Perl_is_utf8_cntrl(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_cntrl)
PL_utf8_cntrl = swash_init("utf8", "IsCntrl", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_cntrl, p);
}
bool
Perl_is_utf8_graph(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_graph)
PL_utf8_graph = swash_init("utf8", "IsGraph", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_graph, p);
}
bool
Perl_is_utf8_print(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_print)
PL_utf8_print = swash_init("utf8", "IsPrint", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_print, p);
}
bool
Perl_is_utf8_punct(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_punct)
PL_utf8_punct = swash_init("utf8", "IsPunct", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_punct, p);
}
bool
Perl_is_utf8_xdigit(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_xdigit)
PL_utf8_xdigit = swash_init("utf8", "IsXDigit", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_xdigit, p);
}
bool
Perl_is_utf8_mark(pTHX_ U8 *p)
{
if (!is_utf8_char(p))
return FALSE;
if (!PL_utf8_mark)
PL_utf8_mark = swash_init("utf8", "IsM", &PL_sv_undef, 0, 0);
return swash_fetch(PL_utf8_mark, p);
}
UV
Perl_to_utf8_upper(pTHX_ U8 *p)
{
UV uv;
if (!PL_utf8_toupper)
PL_utf8_toupper = swash_init("utf8", "ToUpper", &PL_sv_undef, 4, 0);
uv = swash_fetch(PL_utf8_toupper, p);
return uv ? uv : utf8_to_uv(p,0);
}
UV
Perl_to_utf8_title(pTHX_ U8 *p)
{
UV uv;
if (!PL_utf8_totitle)
PL_utf8_totitle = swash_init("utf8", "ToTitle", &PL_sv_undef, 4, 0);
uv = swash_fetch(PL_utf8_totitle, p);
return uv ? uv : utf8_to_uv(p,0);
}
UV
Perl_to_utf8_lower(pTHX_ U8 *p)
{
UV uv;
if (!PL_utf8_tolower)
PL_utf8_tolower = swash_init("utf8", "ToLower", &PL_sv_undef, 4, 0);
uv = swash_fetch(PL_utf8_tolower, p);
return uv ? uv : utf8_to_uv(p,0);
}
/* a "swash" is a swatch hash */
SV*
Perl_swash_init(pTHX_ char* pkg, char* name, SV *listsv, I32 minbits, I32 none)
{
SV* retval;
char tmpbuf[256];
dSP;
if (!gv_stashpv(pkg, 0)) { /* demand load utf8 */
ENTER;
Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, newSVpv(pkg,0), Nullsv);
LEAVE;
}
SPAGAIN;
PUSHSTACKi(PERLSI_MAGIC);
PUSHMARK(SP);
EXTEND(SP,5);
PUSHs(sv_2mortal(newSVpvn(pkg, strlen(pkg))));
PUSHs(sv_2mortal(newSVpvn(name, strlen(name))));
PUSHs(listsv);
PUSHs(sv_2mortal(newSViv(minbits)));
PUSHs(sv_2mortal(newSViv(none)));
PUTBACK;
ENTER;
SAVEI32(PL_hints);
PL_hints = 0;
save_re_context();
if (PL_curcop == &PL_compiling) /* XXX ought to be handled by lex_start */
strncpy(tmpbuf, PL_tokenbuf, sizeof tmpbuf);
if (call_method("SWASHNEW", G_SCALAR))
retval = newSVsv(*PL_stack_sp--);
else
retval = &PL_sv_undef;
LEAVE;
POPSTACK;
if (PL_curcop == &PL_compiling) {
strncpy(PL_tokenbuf, tmpbuf, sizeof tmpbuf);
PL_curcop->op_private = PL_hints;
}
if (!SvROK(retval) || SvTYPE(SvRV(retval)) != SVt_PVHV)
Perl_croak(aTHX_ "SWASHNEW didn't return an HV ref");
return retval;
}
UV
Perl_swash_fetch(pTHX_ SV *sv, U8 *ptr)
{
HV* hv = (HV*)SvRV(sv);
U32 klen = UTF8SKIP(ptr) - 1;
U32 off = ptr[klen] & 127; /* NB: 64 bit always 0 when len > 1 */
STRLEN slen;
STRLEN needents = (klen ? 64 : 128);
U8 *tmps;
U32 bit;
SV *retval;
/*
* This single-entry cache saves about 1/3 of the utf8 overhead in test
* suite. (That is, only 7-8% overall over just a hash cache. Still,
* it's nothing to sniff at.) Pity we usually come through at least
* two function calls to get here...
*
* NB: this code assumes that swatches are never modified, once generated!
*/
if (hv == PL_last_swash_hv &&
klen == PL_last_swash_klen &&
(!klen || memEQ(ptr,PL_last_swash_key,klen)) )
{
tmps = PL_last_swash_tmps;
slen = PL_last_swash_slen;
}
else {
/* Try our second-level swatch cache, kept in a hash. */
SV** svp = hv_fetch(hv, (char*)ptr, klen, FALSE);
/* If not cached, generate it via utf8::SWASHGET */
if (!svp || !SvPOK(*svp) || !(tmps = (U8*)SvPV(*svp, slen))) {
dSP;
ENTER;
SAVETMPS;
save_re_context();
PUSHSTACKi(PERLSI_MAGIC);
PUSHMARK(SP);
EXTEND(SP,3);
PUSHs((SV*)sv);
PUSHs(sv_2mortal(newSViv(utf8_to_uv(ptr, 0) & ~(needents - 1))));
PUSHs(sv_2mortal(newSViv(needents)));
PUTBACK;
if (call_method("SWASHGET", G_SCALAR))
retval = newSVsv(*PL_stack_sp--);
else
retval = &PL_sv_undef;
POPSTACK;
FREETMPS;
LEAVE;
if (PL_curcop == &PL_compiling)
PL_curcop->op_private = PL_hints;
svp = hv_store(hv, (char*)ptr, klen, retval, 0);
if (!svp || !(tmps = (U8*)SvPV(*svp, slen)) || slen < 8)
Perl_croak(aTHX_ "SWASHGET didn't return result of proper length");
}
PL_last_swash_hv = hv;
PL_last_swash_klen = klen;
PL_last_swash_tmps = tmps;
PL_last_swash_slen = slen;
if (klen)
Copy(ptr, PL_last_swash_key, klen, U8);
}
switch ((slen << 3) / needents) {
case 1:
bit = 1 << (off & 7);
off >>= 3;
return (tmps[off] & bit) != 0;
case 8:
return tmps[off];
case 16:
off <<= 1;
return (tmps[off] << 8) + tmps[off + 1] ;
case 32:
off <<= 2;
return (tmps[off] << 24) + (tmps[off+1] << 16) + (tmps[off+2] << 8) + tmps[off + 3] ;
}
Perl_croak(aTHX_ "panic: swash_fetch");
return 0;
}
Reference in New Issue View Git Blame Copy Permalink