X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/20f6aaab8d64a33be1150bb7a380a1b5d03267cb..df74e34d4e5a1f53dd14124de485e098573cb58a:/numeric.c diff --git a/numeric.c b/numeric.c index b472155..505b1ce 100644 --- a/numeric.c +++ b/numeric.c @@ -1,6 +1,7 @@ /* numeric.c * - * Copyright (c) 2001-2002, Larry Wall + * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, + * 2002, 2003, 2004, 2005, 2006, 2007, 2008 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. @@ -8,12 +9,20 @@ */ /* - * "That only makes eleven (plus one mislaid) and not fourteen, unless - * wizards count differently to other people." + * "That only makes eleven (plus one mislaid) and not fourteen, + * unless wizards count differently to other people." --Beorn + * + * [p.115 of _The Hobbit_: "Queer Lodgings"] */ /* =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" @@ -23,6 +32,7 @@ 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) { @@ -41,6 +51,7 @@ Perl_cast_ulong(pTHX_ NV f) 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) { @@ -59,6 +70,7 @@ Perl_cast_i32(pTHX_ NV f) 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) { @@ -78,6 +90,7 @@ Perl_cast_iv(pTHX_ NV f) 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) { @@ -93,22 +106,6 @@ Perl_cast_uv(pTHX_ NV f) 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 @@ -117,16 +114,18 @@ converts a string representing a binary number to numeric form. On entry I and I<*len> give the string to scan, I<*flags> gives conversion flags, and I 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 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 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 returns UV_MAX, sets C in the output flags, and writes the value to I<*result> (or the value is discarded if I 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 is set in I<*flags> on entry. If C is set in I<*flags> then the binary number may use '_' characters to separate digits. @@ -135,34 +134,37 @@ 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 = cBOOL(*flags & PERL_SCAN_ALLOW_UNDERSCORES); bool overflowed = FALSE; + char bit; + + PERL_ARGS_ASSERT_GROK_BIN; if (!(*flags & PERL_SCAN_DISALLOW_PREFIX)) { /* strip off leading b or 0b. for compatibility silently suffer "b" and "0b" as valid binary numbers. */ if (len >= 1) { - if (s[0] == 'b') { + if (s[0] == 'b' || s[0] == 'B') { s++; len--; } - else if (len >= 2 && s[0] == '0' && s[1] == 'b') { + else if (len >= 2 && s[0] == '0' && (s[1] == 'b' || s[1] == 'B')) { s+=2; len-=2; } } } - 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. @@ -174,9 +176,8 @@ Perl_grok_bin(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { continue; } /* Bah. We're just overflowed. */ - if (ckWARN_d(WARN_OVERFLOW)) - Perl_warner(aTHX_ packWARN(WARN_OVERFLOW), - "Integer overflow in binary number"); + Perl_ck_warner_d(aTHX_ packWARN(WARN_OVERFLOW), + "Integer overflow in binary number"); overflowed = TRUE; value_nv = (NV) value; } @@ -197,9 +198,9 @@ Perl_grok_bin(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { ++s; goto redo; } - if (ckWARN(WARN_DIGIT)) - Perl_warner(aTHX_ packWARN(WARN_DIGIT), - "Illegal binary digit '%c' ignored", *s); + if (!(*flags & PERL_SCAN_SILENT_ILLDIGIT)) + Perl_ck_warner(aTHX_ packWARN(WARN_DIGIT), + "Illegal binary digit '%c' ignored", *s); break; } @@ -208,9 +209,8 @@ Perl_grok_bin(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { || (!overflowed && value > 0xffffffff ) #endif ) { - if (ckWARN(WARN_PORTABLE)) - Perl_warner(aTHX_ packWARN(WARN_PORTABLE), - "Binary number > 0b11111111111111111111111111111111 non-portable"); + Perl_ck_warner(aTHX_ packWARN(WARN_PORTABLE), + "Binary number > 0b11111111111111111111111111111111 non-portable"); } *len_p = s - start; if (!overflowed) { @@ -230,9 +230,11 @@ converts a string representing a hex number to numeric form. On entry I and I<*len> give the string to scan, I<*flags> gives conversion flags, and I 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 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 @@ -249,27 +251,29 @@ number may use '_' characters to separate digits. */ 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 = cBOOL(*flags & PERL_SCAN_ALLOW_UNDERSCORES); bool overflowed = FALSE; - const char *hexdigit; + + PERL_ARGS_ASSERT_GROK_HEX; if (!(*flags & PERL_SCAN_DISALLOW_PREFIX)) { /* strip off leading x or 0x. for compatibility silently suffer "x" and "0x" as valid hex numbers. */ if (len >= 1) { - if (s[0] == 'x') { + if (s[0] == 'x' || s[0] == 'X') { s++; len--; } - else if (len >= 2 && s[0] == '0' && s[1] == 'x') { + else if (len >= 2 && s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) { s+=2; len-=2; } @@ -277,7 +281,7 @@ Perl_grok_hex(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { } 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. @@ -289,9 +293,8 @@ Perl_grok_hex(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { continue; } /* Bah. We're just overflowed. */ - if (ckWARN_d(WARN_OVERFLOW)) - Perl_warner(aTHX_ packWARN(WARN_OVERFLOW), - "Integer overflow in hexadecimal number"); + Perl_ck_warner_d(aTHX_ packWARN(WARN_OVERFLOW), + "Integer overflow in hexadecimal number"); overflowed = TRUE; value_nv = (NV) value; } @@ -306,14 +309,14 @@ Perl_grok_hex(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { continue; } if (*s == '_' && len && allow_underscores && s[1] - && (hexdigit = strchr((char *) PL_hexdigit, s[1]))) + && (hexdigit = strchr(PL_hexdigit, s[1]))) { --len; ++s; goto redo; } - if (ckWARN(WARN_DIGIT)) - Perl_warner(aTHX_ packWARN(WARN_DIGIT), + if (!(*flags & PERL_SCAN_SILENT_ILLDIGIT)) + Perl_ck_warner(aTHX_ packWARN(WARN_DIGIT), "Illegal hexadecimal digit '%c' ignored", *s); break; } @@ -323,9 +326,8 @@ Perl_grok_hex(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { || (!overflowed && value > 0xffffffff ) #endif ) { - if (ckWARN(WARN_PORTABLE)) - Perl_warner(aTHX_ packWARN(WARN_PORTABLE), - "Hexadecimal number > 0xffffffff non-portable"); + Perl_ck_warner(aTHX_ packWARN(WARN_PORTABLE), + "Hexadecimal number > 0xffffffff non-portable"); } *len_p = s - start; if (!overflowed) { @@ -341,21 +343,41 @@ Perl_grok_hex(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { /* =for apidoc grok_oct +converts a string representing an octal number to numeric form. + +On entry I and I<*len> give the string to scan, I<*flags> gives +conversion flags, and I 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 is set in I<*flags>, encountering an +8 or 9 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 +returns UV_MAX, sets C in the output flags, +and writes the value to I<*result> (or the value is discarded if I +is NULL). + +If C 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 = cBOOL(*flags & PERL_SCAN_ALLOW_UNDERSCORES); bool overflowed = FALSE; + 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. */ @@ -371,9 +393,8 @@ Perl_grok_oct(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { continue; } /* Bah. We're just overflowed. */ - if (ckWARN_d(WARN_OVERFLOW)) - Perl_warner(aTHX_ packWARN(WARN_OVERFLOW), - "Integer overflow in octal number"); + Perl_ck_warner_d(aTHX_ packWARN(WARN_OVERFLOW), + "Integer overflow in octal number"); overflowed = TRUE; value_nv = (NV) value; } @@ -395,12 +416,12 @@ Perl_grok_oct(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { 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 (ckWARN(WARN_DIGIT)) - Perl_warner(aTHX_ packWARN(WARN_DIGIT), - "Illegal octal digit '%c' ignored", *s); + if (!(*flags & PERL_SCAN_SILENT_ILLDIGIT)) + Perl_ck_warner(aTHX_ packWARN(WARN_DIGIT), + "Illegal octal digit '%c' ignored", *s); } break; } @@ -410,9 +431,8 @@ Perl_grok_oct(pTHX_ char *start, STRLEN *len_p, I32 *flags, NV *result) { || (!overflowed && value > 0xffffffff ) #endif ) { - if (ckWARN(WARN_PORTABLE)) - Perl_warner(aTHX_ packWARN(WARN_PORTABLE), - "Octal number > 037777777777 non-portable"); + Perl_ck_warner(aTHX_ packWARN(WARN_PORTABLE), + "Octal number > 037777777777 non-portable"); } *len_p = s - start; if (!overflowed) { @@ -442,33 +462,39 @@ For backwards compatibility. Use C instead. */ 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); + + PERL_ARGS_ASSERT_SCAN_BIN; *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); + + PERL_ARGS_ASSERT_SCAN_OCT; *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); + + PERL_ARGS_ASSERT_SCAN_HEX; *retlen = len; return (flags & PERL_SCAN_GREATER_THAN_UV_MAX) ? rnv : (NV)ruv; @@ -485,9 +511,13 @@ bool Perl_grok_numeric_radix(pTHX_ const char **sp, const char *send) { #ifdef USE_LOCALE_NUMERIC + dVAR; + + PERL_ARGS_ASSERT_GROK_NUMERIC_RADIX; + 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; @@ -496,6 +526,9 @@ Perl_grok_numeric_radix(pTHX_ const char **sp, const char *send) /* always try "." if numeric radix didn't match because * we may have data from different locales mixed */ #endif + + PERL_ARGS_ASSERT_GROK_NUMERIC_RADIX; + if (*sp < send && **sp == '.') { ++*sp; return TRUE; @@ -530,13 +563,15 @@ int 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; int sawinf = 0; int sawnan = 0; + PERL_ARGS_ASSERT_GROK_NUMBER; + while (s < send && isSPACE(*s)) s++; if (s == send) { @@ -717,7 +752,7 @@ Perl_grok_number(pTHX_ const char *pv, STRLEN len, UV *valuep) return 0; } -NV +STATIC NV S_mulexp10(NV value, I32 exponent) { NV result = 1.0; @@ -728,7 +763,7 @@ S_mulexp10(NV value, I32 exponent) 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 @@ -752,7 +787,7 @@ S_mulexp10(NV value, I32 exponent) #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) { @@ -790,6 +825,10 @@ Perl_my_atof(pTHX_ const char* s) { NV x = 0.0; #ifdef USE_LOCALE_NUMERIC + dVAR; + + PERL_ARGS_ASSERT_MY_ATOF; + if (PL_numeric_local && IN_LOCALE) { NV y; @@ -814,11 +853,11 @@ char* 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}; @@ -829,6 +868,8 @@ Perl_my_atof2(pTHX_ const char* orig, NV* value) I32 old_digit = 0; I32 sig_digits = 0; /* noof significant digits seen so far */ + PERL_ARGS_ASSERT_MY_ATOF2; + /* There is no point in processing more significant digits * than the NV can hold. Note that NV_DIG is a lower-bound value, * while we need an upper-bound value. We add 2 to account for this; @@ -846,7 +887,14 @@ Perl_my_atof2(pTHX_ const char* orig, NV* value) * both the first and last digit, since neither can hold all values from * 0..9; but for calculating the value we must examine those two digits. */ -#define MAX_SIG_DIGITS (NV_DIG+2) +#ifdef MAX_SIG_DIG_PLUS + /* It is not necessarily the case that adding 2 to NV_DIG gets all the + possible digits in a NV, especially if NVs are not IEEE compliant + (e.g., long doubles on IRIX) - Allen */ +# define MAX_SIG_DIGITS (NV_DIG+MAX_SIG_DIG_PLUS) +#else +# define MAX_SIG_DIGITS (NV_DIG+2) +#endif /* the max number we can accumulate in a UV, and still safely do 10*N+9 */ #define MAX_ACCUMULATE ( (UV) ((UV_MAX - 9)/10)) @@ -864,6 +912,21 @@ Perl_my_atof2(pTHX_ const char* orig, NV* value) ++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 */ @@ -916,13 +979,12 @@ Perl_my_atof2(pTHX_ const char* orig, NV* value) ++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; - while (isDIGIT(*s)) { + do { ++s; - } + } while (isDIGIT(*s)); break; } } @@ -969,6 +1031,64 @@ Perl_my_atof2(pTHX_ const char* orig, NV* value) 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) +long double +Perl_my_modfl(long double x, long double *ip) +{ + *ip = aintl(x); + return (x == *ip ? copysignl(0.0L, x) : x - *ip); } +#endif + +#if ! defined(HAS_FREXPL) && defined(HAS_ILOGBL) && defined(HAS_SCALBNL) +long double +Perl_my_frexpl(long double x, int *e) { + *e = x == 0.0L ? 0 : ilogbl(x) + 1; + return (scalbnl(x, -*e)); +} +#endif + +/* +=for apidoc Perl_signbit + +Return a non-zero integer if the sign bit on an NV is set, and 0 if +it is not. + +If Configure detects this system has a signbit() that will work with +our NVs, then we just use it via the #define in perl.h. Otherwise, +fall back on this implementation. As a first pass, this gets everything +right except -0.0. Alas, catching -0.0 is the main use for this function, +so this is not too helpful yet. Still, at least we have the scaffolding +in place to support other systems, should that prove useful. + + +Configure notes: This function is called 'Perl_signbit' instead of a +plain 'signbit' because it is easy to imagine a system having a signbit() +function or macro that doesn't happen to work with our particular choice +of NVs. We shouldn't just re-#define signbit as Perl_signbit and expect +the standard system headers to be happy. Also, this is a no-context +function (no pTHX_) because Perl_signbit() is usually re-#defined in +perl.h as a simple macro call to the system's signbit(). +Users should just always call Perl_signbit(). +=cut +*/ +#if !defined(HAS_SIGNBIT) +int +Perl_signbit(NV x) { + return (x < 0.0) ? 1 : 0; +} +#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: + */