/*
=head1 Numeric functions
+=cut
+
This file contains all the stuff needed by perl for manipulating numeric
values, including such things as replacements for the OS's atof() function
-=cut
-
*/
#include "EXTERN.h"
and I<*flags> gives output flags.
If the value is <= C<UV_MAX> it is returned as a UV, the output flags are clear,
-and nothing is written to I<*result>. If the value is > UV_MAX C<grok_bin>
+and nothing is written to I<*result>. If the value is > UV_MAX C<grok_bin>
returns UV_MAX, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags,
and writes the value to I<*result> (or the value is discarded if I<result>
is NULL).
The binary number may optionally be prefixed with "0b" or "b" unless
-C<PERL_SCAN_DISALLOW_PREFIX> is set in I<*flags> on entry. If
+C<PERL_SCAN_DISALLOW_PREFIX> is set in I<*flags> on entry. If
C<PERL_SCAN_ALLOW_UNDERSCORES> is set in I<*flags> then the binary
number may use '_' characters to separate digits.
converts a string representing a hex number to numeric form.
-On entry I<start> and I<*len> give the string to scan, I<*flags> gives
+On entry I<start> and I<*len_p> give the string to scan, I<*flags> gives
conversion flags, and I<result> should be NULL or a pointer to an NV.
The scan stops at the end of the string, or the first invalid character.
Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in I<*flags>, encountering an
and I<*flags> gives output flags.
If the value is <= UV_MAX it is returned as a UV, the output flags are clear,
-and nothing is written to I<*result>. If the value is > UV_MAX C<grok_hex>
+and nothing is written to I<*result>. If the value is > UV_MAX C<grok_hex>
returns UV_MAX, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags,
and writes the value to I<*result> (or the value is discarded if I<result>
is NULL).
The hex number may optionally be prefixed with "0x" or "x" unless
-C<PERL_SCAN_DISALLOW_PREFIX> is set in I<*flags> on entry. If
+C<PERL_SCAN_DISALLOW_PREFIX> is set in I<*flags> on entry. If
C<PERL_SCAN_ALLOW_UNDERSCORES> is set in I<*flags> then the hex
number may use '_' characters to separate digits.
}
for (; len-- && *s; s++) {
- const char *hexdigit = strchr(PL_hexdigit, *s);
- if (hexdigit) {
+ if (isXDIGIT(*s)) {
/* Write it in this wonky order with a goto to attempt to get the
compiler to make the common case integer-only loop pretty tight.
With gcc seems to be much straighter code than old scan_hex. */
redo:
if (!overflowed) {
if (value <= max_div_16) {
- value = (value << 4) | ((hexdigit - PL_hexdigit) & 15);
+ value = (value << 4) | XDIGIT_VALUE(*s);
continue;
}
/* Bah. We're just overflowed. */
* the low-order bits anyway): we could just remember when
* did we overflow and in the end just multiply value_nv by the
* right amount of 16-tuples. */
- value_nv += (NV)((hexdigit - PL_hexdigit) & 15);
+ value_nv += (NV) XDIGIT_VALUE(*s);
continue;
}
if (*s == '_' && len && allow_underscores && s[1]
- && (hexdigit = strchr(PL_hexdigit, s[1])))
+ && isXDIGIT(s[1]))
{
--len;
++s;
and I<*flags> gives output flags.
If the value is <= UV_MAX it is returned as a UV, the output flags are clear,
-and nothing is written to I<*result>. If the value is > UV_MAX C<grok_oct>
+and nothing is written to I<*result>. If the value is > UV_MAX C<grok_oct>
returns UV_MAX, sets C<PERL_SCAN_GREATER_THAN_UV_MAX> in the output flags,
and writes the value to I<*result> (or the value is discarded if I<result>
is NULL).
PERL_ARGS_ASSERT_GROK_OCT;
for (; len-- && *s; s++) {
- /* gcc 2.95 optimiser not smart enough to figure that this subtraction
- out front allows slicker code. */
- int digit = *s - '0';
- if (digit >= 0 && digit <= 7) {
+ if (isOCTAL(*s)) {
/* Write it in this wonky order with a goto to attempt to get the
compiler to make the common case integer-only loop pretty tight.
*/
redo:
if (!overflowed) {
if (value <= max_div_8) {
- value = (value << 3) | digit;
+ value = (value << 3) | OCTAL_VALUE(*s);
continue;
}
/* Bah. We're just overflowed. */
* the low-order bits anyway): we could just remember when
* did we overflow and in the end just multiply value_nv by the
* right amount of 8-tuples. */
- value_nv += (NV)digit;
+ value_nv += (NV) OCTAL_VALUE(*s);
continue;
}
- if (digit == ('_' - '0') && len && allow_underscores
- && (digit = s[1] - '0') && (digit >= 0 && digit <= 7))
- {
- --len;
- ++s;
- goto redo;
- }
+ if (*s == '_' && len && allow_underscores && isOCTAL(s[1])) {
+ --len;
+ ++s;
+ goto redo;
+ }
/* Allow \octal to work the DWIM way (that is, stop scanning
* as soon as non-octal characters are seen, complain only if
- * someone seems to want to use the digits eight and nine). */
- if (digit == 8 || digit == 9) {
+ * someone seems to want to use the digits eight and nine. Since we
+ * know it is not octal, then if isDIGIT, must be an 8 or 9). */
+ if (isDIGIT(*s)) {
if (!(*flags & PERL_SCAN_SILENT_ILLDIGIT))
Perl_ck_warner(aTHX_ packWARN(WARN_DIGIT),
"Illegal octal digit '%c' ignored", *s);
/*
=for apidoc scan_bin
-For backwards compatibility. Use C<grok_bin> instead.
+For backwards compatibility. Use C<grok_bin> instead.
=for apidoc scan_hex
-For backwards compatibility. Use C<grok_hex> instead.
+For backwards compatibility. Use C<grok_hex> instead.
=for apidoc scan_oct
-For backwards compatibility. Use C<grok_oct> instead.
+For backwards compatibility. Use C<grok_oct> instead.
=cut
*/
PERL_ARGS_ASSERT_GROK_NUMERIC_RADIX;
- if (PL_numeric_radix_sv && IN_SOME_LOCALE_FORM) {
- STRLEN len;
- const char * const radix = SvPV(PL_numeric_radix_sv, len);
- if (*sp + len <= send && memEQ(*sp, radix, len)) {
- *sp += len;
- return TRUE;
+ if (IN_LC(LC_NUMERIC)) {
+ DECLARE_STORE_LC_NUMERIC_SET_TO_NEEDED();
+ if (PL_numeric_radix_sv) {
+ STRLEN len;
+ const char * const radix = SvPV(PL_numeric_radix_sv, len);
+ if (*sp + len <= send && memEQ(*sp, radix, len)) {
+ *sp += len;
+ RESTORE_LC_NUMERIC();
+ return TRUE;
+ }
}
+ RESTORE_LC_NUMERIC();
}
/* always try "." if numeric radix didn't match because
* we may have data from different locales mixed */
numtype = IS_NUMBER_NEG;
}
else if (*s == '+')
- s++;
+ s++;
if (s == send)
return 0;
if (exponent < 0) {
negative = 1;
exponent = -exponent;
+#ifdef NV_MAX_10_EXP
+ /* for something like 1234 x 10^-309, the action of calculating
+ * the intermediate value 10^309 then returning 1234 / (10^309)
+ * will fail, since 10^309 becomes infinity. In this case try to
+ * refactor it as 123 / (10^308) etc.
+ */
+ while (value && exponent > NV_MAX_10_EXP) {
+ exponent--;
+ value /= 10;
+ }
+#endif
}
for (bit = 1; exponent; bit <<= 1) {
if (exponent & bit) {
PERL_ARGS_ASSERT_MY_ATOF;
- if (PL_numeric_local && PL_numeric_radix_sv && IN_SOME_LOCALE_FORM) {
- const char *standard = NULL, *local = NULL;
- bool use_standard_radix;
+ {
+ DECLARE_STORE_LC_NUMERIC_SET_TO_NEEDED();
+ if (PL_numeric_radix_sv && IN_LC(LC_NUMERIC)) {
+ const char *standard = NULL, *local = NULL;
+ bool use_standard_radix;
- /* Look through the string for the first thing that looks like a
- * decimal point: either the value in the current locale or the
- * standard fallback of '.'. The one which appears earliest in the
- * input string is the one that we should have atof look for. Note that
- * we have to determine this beforehand because on some systems,
- * Perl_atof2 is just a wrapper around the system's atof. */
- standard = strchr(s, '.');
- local = strstr(s, SvPV_nolen(PL_numeric_radix_sv));
+ /* Look through the string for the first thing that looks like a
+ * decimal point: either the value in the current locale or the
+ * standard fallback of '.'. The one which appears earliest in the
+ * input string is the one that we should have atof look for. Note
+ * that we have to determine this beforehand because on some
+ * systems, Perl_atof2 is just a wrapper around the system's atof.
+ * */
+ standard = strchr(s, '.');
+ local = strstr(s, SvPV_nolen(PL_numeric_radix_sv));
- use_standard_radix = standard && (!local || standard < local);
+ use_standard_radix = standard && (!local || standard < local);
- if (use_standard_radix)
- SET_NUMERIC_STANDARD();
+ if (use_standard_radix)
+ SET_NUMERIC_STANDARD();
- Perl_atof2(s, x);
+ Perl_atof2(s, x);
- if (use_standard_radix)
- SET_NUMERIC_LOCAL();
+ if (use_standard_radix)
+ SET_NUMERIC_LOCAL();
+ }
+ else
+ Perl_atof2(s, x);
+ RESTORE_LC_NUMERIC();
}
- else
- Perl_atof2(s, x);
#else
Perl_atof2(s, x);
#endif
switch (*s) {
case '-':
negative = 1;
- /* fall through */
+ /* FALLTHROUGH */
case '+':
++s;
}
switch (*s) {
case '-':
expnegative = 1;
- /* fall through */
+ /* FALLTHROUGH */
case '+':
++s;
}
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