/* numeric.c
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- * 2000, 2001, 2002, 2003, by Larry Wall and others
+ * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 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.
/*
=head1 Numeric functions
+
+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"
U32
Perl_cast_ulong(pTHX_ NV f)
{
+ PERL_UNUSED_CONTEXT;
if (f < 0.0)
return f < I32_MIN ? (U32) I32_MIN : (U32)(I32) f;
if (f < U32_MAX_P1) {
I32
Perl_cast_i32(pTHX_ NV f)
{
+ PERL_UNUSED_CONTEXT;
if (f < I32_MAX_P1)
return f < I32_MIN ? I32_MIN : (I32) f;
if (f < U32_MAX_P1) {
IV
Perl_cast_iv(pTHX_ NV f)
{
+ PERL_UNUSED_CONTEXT;
if (f < IV_MAX_P1)
return f < IV_MIN ? IV_MIN : (IV) f;
if (f < UV_MAX_P1) {
UV
Perl_cast_uv(pTHX_ NV f)
{
+ PERL_UNUSED_CONTEXT;
if (f < 0.0)
return f < IV_MIN ? (UV) IV_MIN : (UV)(IV) f;
if (f < UV_MAX_P1) {
return f > 0 ? UV_MAX : 0 /* NaN */;
}
-#if defined(HUGE_VAL) || (defined(USE_LONG_DOUBLE) && defined(HUGE_VALL))
-/*
- * This hack is to force load of "huge" support from libm.a
- * So it is in perl for (say) POSIX to use.
- * Needed for SunOS with Sun's 'acc' for example.
- */
-NV
-Perl_huge(void)
-{
-# if defined(USE_LONG_DOUBLE) && defined(HUGE_VALL)
- return HUGE_VALL;
-# endif
- return HUGE_VAL;
-}
-#endif
-
/*
=for apidoc grok_bin
On entry I<start> and I<*len> 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.
-On return I<*len> is set to the length scanned string, and I<*flags> gives
-output flags.
+Unless C<PERL_SCAN_SILENT_ILLDIGIT> is set in I<*flags>, encountering an
+invalid character will also trigger a warning.
+On return I<*len> is set to the length of the scanned string,
+and I<*flags> gives output flags.
-If the value is <= UV_MAX it is returned as a UV, the output flags are clear,
+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>
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 "0b" or "b" unless
+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_ALLOW_UNDERSCORES> is set in I<*flags> then the binary
number may use '_' characters to separate digits.
*/
UV
-Perl_grok_bin(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) {
+Perl_grok_bin(pTHX_ const char *start, STRLEN *len_p, I32 *flags, NV *result) {
const char *s = start;
STRLEN len = *len_p;
UV value = 0;
NV value_nv = 0;
const UV max_div_2 = UV_MAX / 2;
- bool allow_underscores = *flags & PERL_SCAN_ALLOW_UNDERSCORES;
+ const bool allow_underscores = (bool)(*flags & PERL_SCAN_ALLOW_UNDERSCORES);
bool overflowed = FALSE;
+ char bit;
if (!(*flags & PERL_SCAN_DISALLOW_PREFIX)) {
/* strip off leading b or 0b.
}
}
- for (; len-- && *s; s++) {
- char bit = *s;
+ for (; len-- && (bit = *s); s++) {
if (bit == '0' || bit == '1') {
/* 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.
On entry I<start> and I<*len> 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 non-hex-digit character.
-On return I<*len> is set to the length scanned string, and I<*flags> gives
-output flags.
+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
+invalid character will also trigger a warning.
+On return I<*len> is set to the length of the scanned string,
+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>
*/
UV
-Perl_grok_hex(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) {
+Perl_grok_hex(pTHX_ const char *start, STRLEN *len_p, I32 *flags, NV *result) {
+ dVAR;
const char *s = start;
STRLEN len = *len_p;
UV value = 0;
NV value_nv = 0;
const UV max_div_16 = UV_MAX / 16;
- bool allow_underscores = *flags & PERL_SCAN_ALLOW_UNDERSCORES;
+ const bool allow_underscores = (bool)(*flags & PERL_SCAN_ALLOW_UNDERSCORES);
bool overflowed = FALSE;
- const char *hexdigit;
if (!(*flags & PERL_SCAN_DISALLOW_PREFIX)) {
/* strip off leading x or 0x.
}
for (; len-- && *s; s++) {
- hexdigit = strchr((char *) PL_hexdigit, *s);
+ const char *hexdigit = strchr(PL_hexdigit, *s);
if (hexdigit) {
/* 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.
continue;
}
if (*s == '_' && len && allow_underscores && s[1]
- && (hexdigit = strchr((char *) PL_hexdigit, s[1])))
+ && (hexdigit = strchr(PL_hexdigit, s[1])))
{
--len;
++s;
/*
=for apidoc grok_oct
+converts a string representing an octal number to numeric form.
+
+On entry I<start> and I<*len> 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
+invalid character will also trigger a warning.
+On return I<*len> is set to the length of the scanned string,
+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>
+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).
+
+If C<PERL_SCAN_ALLOW_UNDERSCORES> is set in I<*flags> then the octal
+number may use '_' characters to separate digits.
=cut
*/
UV
-Perl_grok_oct(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) {
+Perl_grok_oct(pTHX_ const char *start, STRLEN *len_p, I32 *flags, NV *result) {
const char *s = start;
STRLEN len = *len_p;
UV value = 0;
NV value_nv = 0;
const UV max_div_8 = UV_MAX / 8;
- bool allow_underscores = *flags & PERL_SCAN_ALLOW_UNDERSCORES;
+ const bool allow_underscores = (bool)(*flags & PERL_SCAN_ALLOW_UNDERSCORES);
bool overflowed = FALSE;
for (; len-- && *s; s++) {
goto redo;
}
/* Allow \octal to work the DWIM way (that is, stop scanning
- * as soon as non-octal characters are seen, complain only iff
+ * 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) {
if (!(*flags & PERL_SCAN_SILENT_ILLDIGIT) && ckWARN(WARN_DIGIT))
*/
NV
-Perl_scan_bin(pTHX_ char *start, STRLEN len, STRLEN *retlen)
+Perl_scan_bin(pTHX_ const char *start, STRLEN len, STRLEN *retlen)
{
NV rnv;
I32 flags = *retlen ? PERL_SCAN_ALLOW_UNDERSCORES : 0;
- UV ruv = grok_bin (start, &len, &flags, &rnv);
+ const UV ruv = grok_bin (start, &len, &flags, &rnv);
*retlen = len;
return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv;
}
NV
-Perl_scan_oct(pTHX_ char *start, STRLEN len, STRLEN *retlen)
+Perl_scan_oct(pTHX_ const char *start, STRLEN len, STRLEN *retlen)
{
NV rnv;
I32 flags = *retlen ? PERL_SCAN_ALLOW_UNDERSCORES : 0;
- UV ruv = grok_oct (start, &len, &flags, &rnv);
+ const UV ruv = grok_oct (start, &len, &flags, &rnv);
*retlen = len;
return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv;
}
NV
-Perl_scan_hex(pTHX_ char *start, STRLEN len, STRLEN *retlen)
+Perl_scan_hex(pTHX_ const char *start, STRLEN len, STRLEN *retlen)
{
NV rnv;
I32 flags = *retlen ? PERL_SCAN_ALLOW_UNDERSCORES : 0;
- UV ruv = grok_hex (start, &len, &flags, &rnv);
+ const UV ruv = grok_hex (start, &len, &flags, &rnv);
*retlen = len;
return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv;
Perl_grok_numeric_radix(pTHX_ const char **sp, const char *send)
{
#ifdef USE_LOCALE_NUMERIC
+ dVAR;
if (PL_numeric_radix_sv && IN_LOCALE) {
STRLEN len;
- char* radix = SvPV(PL_numeric_radix_sv, len);
+ const char * const radix = SvPV(PL_numeric_radix_sv, len);
if (*sp + len <= send && memEQ(*sp, radix, len)) {
*sp += len;
return TRUE;
Perl_grok_number(pTHX_ const char *pv, STRLEN len, UV *valuep)
{
const char *s = pv;
- const char *send = pv + len;
+ const char * const send = pv + len;
const UV max_div_10 = UV_MAX / 10;
const char max_mod_10 = UV_MAX % 10;
int numtype = 0;
if (exponent == 0)
return value;
if (value == 0)
- return 0;
+ return (NV)0;
/* On OpenVMS VAX we by default use the D_FLOAT double format,
* and that format does not have *easy* capabilities [1] for
#if ((defined(VMS) && !defined(__IEEE_FP)) || defined(_UNICOS)) && defined(NV_MAX_10_EXP)
STMT_START {
- NV exp_v = log10(value);
+ const NV exp_v = log10(value);
if (exponent >= NV_MAX_10_EXP || exponent + exp_v >= NV_MAX_10_EXP)
return NV_MAX;
if (exponent < 0) {
{
NV x = 0.0;
#ifdef USE_LOCALE_NUMERIC
+ dVAR;
if (PL_numeric_local && IN_LOCALE) {
NV y;
Perl_my_atof2(pTHX_ const char* orig, NV* value)
{
NV result[3] = {0.0, 0.0, 0.0};
- char* s = (char*)orig;
+ const char* s = orig;
#ifdef USE_PERL_ATOF
UV accumulator[2] = {0,0}; /* before/after dp */
bool negative = 0;
- char* send = s + strlen(orig) - 1;
+ const char* send = s + strlen(orig) - 1;
bool seen_digit = 0;
I32 exp_adjust[2] = {0,0};
I32 exp_acc[2] = {-1, -1};
++s;
}
+ /* punt to strtod for NaN/Inf; if no support for it there, tough luck */
+
+#ifdef HAS_STRTOD
+ if (*s == 'n' || *s == 'N' || *s == 'i' || *s == 'I') {
+ const char *p = negative ? s - 1 : s;
+ char *endp;
+ NV rslt;
+ rslt = strtod(p, &endp);
+ if (endp != p) {
+ *value = rslt;
+ return (char *)endp;
+ }
+ }
+#endif
+
/* we accumulate digits into an integer; when this becomes too
* large, we add the total to NV and start again */
++exp_acc[seen_dp];
}
}
- else if (!seen_dp && GROK_NUMERIC_RADIX((const char **)&s, send)) {
+ else if (!seen_dp && GROK_NUMERIC_RADIX(&s, send)) {
seen_dp = 1;
if (sig_digits > MAX_SIG_DIGITS) {
++s;
result[2] = -result[2];
#endif /* USE_PERL_ATOF */
*value = result[2];
- return s;
+ return (char *)s;
}
#if ! defined(HAS_MODFL) && defined(HAS_AINTL) && defined(HAS_COPYSIGNL)
return (scalbnl(x, -*e));
}
#endif
+
+/*
+ * Local variables:
+ * c-indentation-style: bsd
+ * c-basic-offset: 4
+ * indent-tabs-mode: t
+ * End:
+ *
+ * ex: set ts=8 sts=4 sw=4 noet:
+ */
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