__UNDEFINED__ my_strnlen SvUOK utf8_to_uvchr_buf

_ppport_utf8_to_uvchr_buf_callee _ppport_MIN

#define _ppport_MIN(a,b) (((a) <= (b)) ? (a) : (b))

__UNDEFINED__ sv_setuv(sv, uv) \ STMT_START { \ UV TeMpUv = uv; \ if (TeMpUv <= IV_MAX) \ sv_setiv(sv, TeMpUv); \ else \ sv_setnv(sv, (double)TeMpUv); \ } STMT_END

__UNDEFINED__ newSVuv(uv) ((uv) <= IV_MAX ? newSViv((IV)uv) : newSVnv((NV)uv))

__UNDEFINED__ sv_2uv(sv) ((PL_Sv = (sv)), (UV) (SvNOK(PL_Sv) ? SvNV(PL_Sv) : sv_2nv(PL_Sv))) __UNDEFINED__ SvUVX(sv) ((UV)SvIVX(sv)) __UNDEFINED__ SvUVXx(sv) SvUVX(sv) __UNDEFINED__ SvUV(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv(sv)) __UNDEFINED__ SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))

/* Hint: sv_uv * Always use the SvUVx() macro instead of sv_uv(). */ __UNDEFINED__ sv_uv(sv) SvUVx(sv)

#if !defined(SvUOK) && defined(SvIOK_UV) # define SvUOK(sv) SvIOK_UV(sv) #endif

__UNDEFINED__ XST_mUV(i,v) (ST(i) = sv_2mortal(newSVuv(v)) ) __UNDEFINED__ XSRETURN_UV(v) STMT_START { XST_mUV(0,v); XSRETURN(1); } STMT_END

__UNDEFINED__ PUSHu(u) STMT_START { sv_setuv(TARG, (UV)(u)); PUSHTARG; } STMT_END __UNDEFINED__ XPUSHu(u) STMT_START { sv_setuv(TARG, (UV)(u)); XPUSHTARG; } STMT_END

#if defined UTF8SKIP

/* Don't use official version because it uses MIN, which may not be available */ #undef UTF8_SAFE_SKIP

__UNDEFINED__ UTF8_SAFE_SKIP(s, e) ( \ ((((e) - (s)) <= 0) \ ? 0 \ : _ppport_MIN(((e) - (s)), UTF8SKIP(s)))) #endif

#if !defined(my_strnlen) #if { NEED my_strnlen }

STRLEN my_strnlen(const char *str, Size_t maxlen) { const char *p = str;

while(maxlen-- && *p)
    p++;

return p - str;
}

#endif #endif

#if { VERSION < 5.30.0 } /* Versions prior to this accepted things that are now considered * malformations, and didn't return -1 on error with warnings enabled * */ # undef utf8_to_uvchr_buf #endif

/* This implementation brings modern, generally more restricted standards to * utf8_to_uvchr_buf. Some of these are security related, and clearly must * be done. But its arguable that the others need not, and hence should not. * The reason they're here is that a module that intends to play with the * latest perls shoud be able to work the same in all releases. An example is * that perl no longer accepts any UV for a code point, but limits them to * IV_MAX or below. This is for future internal use of the larger code points. * If it turns out that some of these changes are breaking code that isn't * intended to work with modern perls, the tighter restrictions could be * relaxed. khw thinks this is unlikely, but has been wrong in the past. */

#ifndef utf8_to_uvchr_buf /* Choose which underlying implementation to use. At least one must be * present or the perl is too early to handle this function */ # if defined(utf8n_to_uvchr) || defined(utf8_to_uv) # if defined(utf8n_to_uvchr) /* This is the preferred implementation */ # define _ppport_utf8_to_uvchr_buf_callee utf8n_to_uvchr # else # define _ppport_utf8_to_uvchr_buf_callee utf8_to_uv # endif

# endif

#ifdef _ppport_utf8_to_uvchr_buf_callee # if { NEED utf8_to_uvchr_buf }

UV utf8_to_uvchr_buf(pTHX_ const U8 *s, const U8 *send, STRLEN *retlen) { UV ret; STRLEN curlen; bool overflows = 0; const U8 *cur_s = s; const bool do_warnings = ckWARN_d(WARN_UTF8);

if (send > s) {
    curlen = send - s;
}
else {
    assert(0);  /* Modern perls die under this circumstance */
    curlen = 0;
    if (! do_warnings) {    /* Handle empty here if no warnings needed */
        if (retlen) *retlen = 0;
        return UNICODE_REPLACEMENT;
    }
}

/* The modern version allows anything that evaluates to a legal UV, but not
 * overlongs nor an empty input */
ret = _ppport_utf8_to_uvchr_buf_callee(
            s, curlen, retlen,   (UTF8_ALLOW_ANYUV
                              & ~(UTF8_ALLOW_LONG|UTF8_ALLOW_EMPTY)));

/* But actually, modern versions restrict the UV to being no more than what
 * an IV can hold */
if (ret > PERL_INT_MAX) {
    overflows = 1;
}

# if { VERSION < 5.26.0 } # ifndef EBCDIC

    /* There are bugs in versions earlier than this on non-EBCDIC platforms
     * in which it did not detect all instances of overflow, which could be
     * a security hole.  Also, earlier versions did not allow the overflow
     * malformation under any circumstances, and modern ones do.  So we
     * need to check here.  */

else if (curlen > 0 && *s >= 0xFE) {

    /* If the main routine detected overflow, great; it returned 0.  But if the
     * input's first byte indicates it could overflow, we need to verify.
     * First, on a 32-bit machine the first byte being at least \xFE
     * automatically is overflow */
    if (sizeof(ret) < 8) {
        overflows = 1;
    }
    else {
        const U8 highest[] =    /* 2*63-1 */
                    "\xFF\x80\x87\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF\xBF";
        const U8 *cur_h = highest;

        for (cur_s = s; cur_s < send; cur_s++, cur_h++) {
            if (UNLIKELY(*cur_s == *cur_h)) {
                continue;
            }

            /* If this byte is larger than the corresponding highest UTF-8
            * byte, the sequence overflows; otherwise the byte is less than
            * (as we handled the equality case above), and so the sequence
            * doesn't overflow */
            overflows = *cur_s > *cur_h;
            break;

        }

        /* Here, either we set the bool and broke out of the loop, or got
         * to the end and all bytes are the same which indicates it doesn't
         * overflow. */
    }
}

# endif # endif /* < 5.26 */

if (UNLIKELY(overflows)) {
    if (! do_warnings) {
        if (retlen) {
            *retlen = _ppport_MIN(*retlen, UTF8SKIP(s));
            *retlen = _ppport_MIN(*retlen, curlen);
        }
        return UNICODE_REPLACEMENT;
    }
    else {

        /* On versions that correctly detect overflow, but forbid it
         * always, 0 will be returned, but also a warning will have been
         * raised.  Don't repeat it */
        if (ret != 0) {
            /* We use the error message in use from 5.8-5.14 */
            Perl_warner(aTHX_ packWARN(WARN_UTF8),
                "Malformed UTF-8 character (overflow at 0x%" UVxf
                ", byte 0x%02x, after start byte 0x%02x)",
                ret, *cur_s, *s);
        }
        if (retlen) {
            *retlen = (STRLEN) -1;
        }
        return 0;
    }
}

/* If failed and warnings are off, to emulate the behavior of the real
 * utf8_to_uvchr(), try again, allowing anything.  (Note a return of 0 is
 * ok if the input was '\0') */
if (UNLIKELY(ret == 0 && (curlen == 0 || *s != '\0'))) {

    /* If curlen is 0, we already handled the case where warnings are
     * disabled, so this 'if' will be true, and we won't look at the
     * contents of 's' */
    if (do_warnings) {
        *retlen = (STRLEN) -1;
    }
    else {
        ret = _ppport_utf8_to_uvchr_buf_callee(
                                        s, curlen, retlen, UTF8_ALLOW_ANY);
        /* Override with the REPLACEMENT character, as that is what the
         * modern version of this function returns */
        ret = UNICODE_REPLACEMENT;

# if { VERSION < 5.16.0 }

/* Versions earlier than this don't necessarily return the proper
 * length.  It should not extend past the end of string, nor past
 * what the first byte indicates the length is, nor past the
 * continuation characters */
if (retlen && *retlen >= 0) {
    *retlen = _ppport_MIN(*retlen, curlen);
    *retlen = _ppport_MIN(*retlen, UTF8SKIP(s));
    unsigned int i = 1;
    do {
        if (s[i] < 0x80 || s[i] > 0xBF) {
            *retlen = i;
            break;
        }
    } while (++i < *retlen);
}

# endif

    }
}

return ret;
}

# endif #endif #endif

#if defined(UTF8SKIP) && defined(utf8_to_uvchr_buf) #undef utf8_to_uvchr /* Always redefine this unsafe function so that it refuses to read past a NUL, making it much less likely to read off the end of the buffer. A NUL indicates the start of the next character anyway. If the input isn't NUL-terminated, the function remains unsafe, as it always has been. */

__UNDEFINED__ utf8_to_uvchr(s, lp) \ ((*(s) == '\0') \ ? utf8_to_uvchr_buf(s,((s)+1), lp) /* Handle single NUL specially */ \ : utf8_to_uvchr_buf(s, (s) + my_strnlen((char *) (s), UTF8SKIP(s)), (lp)))

#endif

#define NEED_my_strnlen #define NEED_utf8_to_uvchr_buf

SV * sv_setuv(uv) UV uv CODE: RETVAL = newSViv(1); sv_setuv(RETVAL, uv); OUTPUT: RETVAL

SV * newSVuv(uv) UV uv CODE: RETVAL = newSVuv(uv); OUTPUT: RETVAL

UV sv_2uv(sv) SV *sv CODE: RETVAL = sv_2uv(sv); OUTPUT: RETVAL

UV SvUVx(sv) SV *sv CODE: sv--; RETVAL = SvUVx(++sv); OUTPUT: RETVAL

void XSRETURN_UV() PPCODE: XSRETURN_UV(42);

void PUSHu() PREINIT: dTARG; PPCODE: TARG = sv_newmortal(); EXTEND(SP, 1); PUSHu(42); XSRETURN(1);

void XPUSHu() PREINIT: dTARG; PPCODE: TARG = sv_newmortal(); XPUSHu(43); XSRETURN(1);

STRLEN UTF8_SAFE_SKIP(s, adjustment) unsigned char * s int adjustment CODE: /* Instead of passing in an 'e' ptr, use the real end, adjusted */ RETVAL = UTF8_SAFE_SKIP(s, s + UTF8SKIP(s) + adjustment); OUTPUT: RETVAL

STRLEN my_strnlen(s, max) char * s STRLEN max CODE: RETVAL= my_strnlen(s, max); OUTPUT: RETVAL

AV * utf8_to_uvchr_buf(s, adjustment) unsigned char *s int adjustment PREINIT: AV *av; STRLEN len; CODE: av = newAV(); av_push(av, newSVuv(utf8_to_uvchr_buf(s, s + UTF8SKIP(s) + adjustment, &len))); av_push(av, newSViv((IV) len)); RETVAL = av; OUTPUT: RETVAL

AV * utf8_to_uvchr(s) unsigned char *s PREINIT: AV *av; STRLEN len; CODE: av = newAV(); av_push(av, newSVuv(utf8_to_uvchr(s, &len))); av_push(av, newSViv((IV) len)); RETVAL = av; OUTPUT: RETVAL

ok(&Devel::PPPort::sv_setuv(42), 42); ok(&Devel::PPPort::newSVuv(123), 123); ok(&Devel::PPPort::sv_2uv("4711"), 4711); ok(&Devel::PPPort::sv_2uv("1735928559"), 1735928559); ok(&Devel::PPPort::SvUVx("1735928559"), 1735928559); ok(&Devel::PPPort::SvUVx(1735928559), 1735928559); ok(&Devel::PPPort::SvUVx(0xdeadbeef), 0xdeadbeef); ok(&Devel::PPPort::XSRETURN_UV(), 42); ok(&Devel::PPPort::PUSHu(), 42); ok(&Devel::PPPort::XPUSHu(), 43); ok(&Devel::PPPort::UTF8_SAFE_SKIP("A", 0), 1); ok(&Devel::PPPort::UTF8_SAFE_SKIP("A", -1), 0); ok(&Devel::PPPort::my_strnlen("abc\0def", 7), 3);

my $ret = &Devel::PPPort::utf8_to_uvchr("A"); ok($ret->[0], ord("A")); ok($ret->[1], 1);

$ret = &Devel::PPPort::utf8_to_uvchr("\0"); ok($ret->[0], 0); ok($ret->[1], 1);

$ret = &Devel::PPPort::utf8_to_uvchr_buf("A", 0); ok($ret->[0], ord("A")); ok($ret->[1], 1);

$ret = &Devel::PPPort::utf8_to_uvchr_buf("\0", 0); ok($ret->[0], 0); ok($ret->[1], 1);

if (ord("A") != 65) { # tests not valid for EBCDIC ok(1, 1) for 1 .. (2 + 4 + (5 * 5)); } else { $ret = &Devel::PPPort::utf8_to_uvchr_buf("\xc4\x80", 0); ok($ret->[0], 0x100); ok($ret->[1], 2);

my @warnings;
local $SIG{__WARN__} = sub { push @warnings, @_; };

{
    use warnings 'utf8';
    $ret = &Devel::PPPort::utf8_to_uvchr("\xe0\0\x80");
    ok($ret->[0], 0);
    ok($ret->[1], -1);

    no warnings;
    $ret = &Devel::PPPort::utf8_to_uvchr("\xe0\0\x80");
    ok($ret->[0], 0xFFFD);
    ok($ret->[1], 1);
}

my @buf_tests = (
    {
        input      => "A",
        adjustment => -1,
        warning    => qr/empty/,
        no_warnings_returned_length => 0,
    },
    {
        input      => "\xc4\xc5",
        adjustment => 0,
        warning    => qr/non-continuation/,
        no_warnings_returned_length => 1,
    },
    {
        input      => "\xc4\x80",
        adjustment => -1,
        warning    => qr/short|1 byte, need 2/,
        no_warnings_returned_length => 1,
    },
    {
        input      => "\xc0\x81",
        adjustment => 0,
        warning    => qr/overlong|2 bytes, need 1/,
        no_warnings_returned_length => 2,
    },
    {                 # Old algorithm supposedly failed to detect this
        input      => "\xff\x80\x90\x90\x90\xbf\xbf\xbf\xbf\xbf\xbf\xbf\xbf",
        adjustment => 0,
        warning    => qr/overflow/,
        no_warnings_returned_length => 13,
    },
);

# An empty input is an assertion failure on debugging builds.  It is
# deliberately the first test.
require Config; import Config;
use vars '%Config';
if ($Config{ccflags} =~ /-DDEBUGGING/) {
    shift @buf_tests;
    ok(1, 1) for 1..5;
}

for my $test (@buf_tests) {
    my $input = $test->{'input'};
    my $adjustment = $test->{'adjustment'};
    my $display = 'utf8_to_uvchr_buf("';
    for (my $i = 0; $i < length($input) + $adjustment; $i++) {
        $display .= sprintf "\\x%02x", ord substr($input, $i, 1);
    }

    $display .= '")';
    my $warning = $test->{'warning'};

    undef @warnings;
    use warnings 'utf8';
    $ret = &Devel::PPPort::utf8_to_uvchr_buf($input, $adjustment);
    ok($ret->[0], 0,  "returned value $display; warnings enabled");
    ok($ret->[1], -1, "returned length $display; warnings enabled");
    my $all_warnings = join "; ", @warnings;
    my $contains = grep { $_ =~ $warning } $all_warnings;
    ok($contains, 1, $display . "; '$all_warnings' contains '$warning'");

    undef @warnings;
    no warnings 'utf8';
    $ret = &Devel::PPPort::utf8_to_uvchr_buf($input, $adjustment);
    ok($ret->[0], 0xFFFD,  "returned value $display; warnings disabled");
    ok($ret->[1], $test->{'no_warnings_returned_length'},
                  "returned length $display; warnings disabled");
}
}

cpanm Devel::PPPort

perl -MCPAN -e shell
install Devel::PPPort