__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 < 5.31.2 } /* 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))); if (len == (STRLEN) -1) { av_push(av, newSViv(-1)); } else { av_push(av, newSVuv(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))); if (len == (STRLEN) -1) { av_push(av, newSViv(-1)); } else { av_push(av, newSVuv(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