Mercurial > octave
view liboctave/util/lo-utils.cc @ 31060:7201d9b7cea6 stable
NEWS.7.md: Fix typo and formatting.
author | Markus Mützel <markus.muetzel@gmx.de> |
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date | Thu, 02 Jun 2022 19:52:08 +0200 |
parents | 796f54d4ddbf |
children | 6bd338605fd3 e88a07dec498 |
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//////////////////////////////////////////////////////////////////////// // // Copyright (C) 1996-2022 The Octave Project Developers // // See the file COPYRIGHT.md in the top-level directory of this // distribution or <https://octave.org/copyright/>. // // This file is part of Octave. // // Octave is free software: you can redistribute it and/or modify it // under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Octave is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with Octave; see the file COPYING. If not, see // <https://www.gnu.org/licenses/>. // //////////////////////////////////////////////////////////////////////// #if defined (HAVE_CONFIG_H) # include "config.h" #endif #include <cstdlib> #include <cstring> #include <complex> #include <istream> #include <limits> #include <ostream> #include <string> #include "quit.h" #include "intprops-wrappers.h" #include "lo-error.h" #include "lo-ieee.h" #include "lo-mappers.h" #include "lo-utils.h" #include "oct-inttypes.h" namespace octave { bool is_int_or_inf_or_nan (double x) { return math::isnan (x) || math::x_nint (x) == x; } bool too_large_for_float (double x) { return (math::isfinite (x) && fabs (x) > std::numeric_limits<float>::max ()); } bool too_large_for_float (const Complex& x) { return (too_large_for_float (x.real ()) || too_large_for_float (x.imag ())); } bool is_int_or_inf_or_nan (float x) { return math::isnan (x) || math::x_nint (x) == x; } // Save a string. char * strsave (const char *s) { if (! s) return nullptr; int len = strlen (s); char *tmp = new char [len+1]; tmp = strcpy (tmp, s); return tmp; } std::string fgets (FILE *f) { bool eof; return fgets (f, eof); } std::string fgets (FILE *f, bool& eof) { eof = false; std::string retval; int grow_size = 1024; int max_size = grow_size; char *buf = static_cast<char *> (std::malloc (max_size)); if (! buf) (*current_liboctave_error_handler) ("octave_fgets: unable to malloc %d bytes", max_size); char *bufptr = buf; int len = 0; do { if (std::fgets (bufptr, grow_size, f)) { len = strlen (bufptr); if (len == grow_size - 1) { int tmp = bufptr - buf + grow_size - 1; grow_size *= 2; max_size += grow_size; auto tmpbuf = static_cast<char *> (std::realloc (buf, max_size)); if (! tmpbuf) { free (buf); (*current_liboctave_error_handler) ("octave_fgets: unable to realloc %d bytes", max_size); } buf = tmpbuf; bufptr = buf + tmp; if (*(bufptr-1) == '\n') { *bufptr = '\0'; retval = buf; } } else if (bufptr[len-1] != '\n') { bufptr[len++] = '\n'; bufptr[len] = '\0'; retval = buf; } else retval = buf; } else { if (len == 0) { eof = true; free (buf); buf = nullptr; } break; } } while (retval.empty ()); free (buf); octave_quit (); return retval; } std::string fgetl (FILE *f) { bool eof; return fgetl (f, eof); } std::string fgetl (FILE *f, bool& eof) { std::string retval = fgets (f, eof); if (! retval.empty () && retval.back () == '\n') retval.pop_back (); return retval; } template <typename T> T read_value (std::istream& is) { T retval; is >> retval; return retval; } template OCTAVE_API bool read_value<bool> (std::istream& is); template OCTAVE_API octave_int8 read_value<octave_int8> (std::istream& is); template OCTAVE_API octave_int16 read_value<octave_int16> (std::istream& is); template OCTAVE_API octave_int32 read_value<octave_int32> (std::istream& is); template OCTAVE_API octave_int64 read_value<octave_int64> (std::istream& is); template OCTAVE_API octave_uint8 read_value<octave_uint8> (std::istream& is); template OCTAVE_API octave_uint16 read_value<octave_uint16> (std::istream& is); template OCTAVE_API octave_uint32 read_value<octave_uint32> (std::istream& is); template OCTAVE_API octave_uint64 read_value<octave_uint64> (std::istream& is); // Note that the caller is responsible for repositioning the stream on // failure. template <typename T> T read_inf_nan_na (std::istream& is, char c0) { T val = 0.0; switch (c0) { case 'i': case 'I': { char c1 = is.get (); if (c1 == 'n' || c1 == 'N') { char c2 = is.get (); if (c2 == 'f' || c2 == 'F') val = std::numeric_limits<T>::infinity (); else is.setstate (std::ios::failbit); } else is.setstate (std::ios::failbit); } break; case 'n': case 'N': { char c1 = is.get (); if (c1 == 'a' || c1 == 'A') { char c2 = is.get (); if (c2 == 'n' || c2 == 'N') val = std::numeric_limits<T>::quiet_NaN (); else { val = numeric_limits<T>::NA (); if (c2 != std::istream::traits_type::eof ()) is.putback (c2); else is.clear (is.rdstate () & ~std::ios::failbit); } } else is.setstate (std::ios::failbit); } break; default: (*current_liboctave_error_handler) ("read_inf_nan_na: invalid character '%c'", c0); } return val; } // Read a double value. Discard any sign on NaN and NA. template <typename T> double read_fp_value (std::istream& is) { T val = 0.0; // FIXME: resetting stream position is likely to fail unless we are // reading from a file. std::streampos pos = is.tellg (); char c1 = ' '; while (isspace (c1)) c1 = is.get (); bool neg = false; switch (c1) { case '-': neg = true; OCTAVE_FALLTHROUGH; case '+': { char c2 = 0; c2 = is.get (); if (c2 == 'i' || c2 == 'I' || c2 == 'n' || c2 == 'N') val = read_inf_nan_na<T> (is, c2); else { is.putback (c2); is >> val; } if (neg && ! is.fail ()) val = -val; } break; case 'i': case 'I': case 'n': case 'N': val = read_inf_nan_na<T> (is, c1); break; default: is.putback (c1); is >> val; break; } std::ios::iostate status = is.rdstate (); if (status & std::ios::failbit) { // Convert MAX_VAL returned by C++ streams for very large numbers to Inf if (val == std::numeric_limits<T>::max ()) { if (neg) val = -std::numeric_limits<T>::infinity (); else val = std::numeric_limits<T>::infinity (); is.clear (status & ~std::ios::failbit); } else { // True error. Reset stream to original position and pass status on. is.clear (); is.seekg (pos); is.setstate (status); } } return val; } template <typename T> std::complex<T> read_cx_fp_value (std::istream& is) { T re = 0.0; T im = 0.0; std::complex<T> cx = 0.0; char ch = ' '; while (isspace (ch)) ch = is.get (); if (ch == '(') { re = read_value<T> (is); ch = is.get (); if (ch == ',') { im = read_value<T> (is); ch = is.get (); if (ch == ')') cx = std::complex<T> (re, im); else is.setstate (std::ios::failbit); } else if (ch == ')') cx = re; else is.setstate (std::ios::failbit); } else { is.putback (ch); cx = read_value<T> (is); } return cx; } // FIXME: Could we use traits and enable_if to avoid duplication in the // following specializations? template <> OCTAVE_API double read_value (std::istream& is) { return read_fp_value<double> (is); } template <> OCTAVE_API Complex read_value (std::istream& is) { return read_cx_fp_value<double> (is); } template <> OCTAVE_API float read_value (std::istream& is) { return read_fp_value<float> (is); } template <> OCTAVE_API FloatComplex read_value (std::istream& is) { return read_cx_fp_value<float> (is); } template <typename T> void write_value (std::ostream& os, const T& value) { os << value; } template OCTAVE_API void write_value<bool> (std::ostream& os, const bool& value); template OCTAVE_API void write_value<octave_int8> (std::ostream& os, const octave_int8& value); template OCTAVE_API void write_value<octave_int16> (std::ostream& os, const octave_int16& value); template OCTAVE_API void write_value<octave_int32> (std::ostream& os, const octave_int32& value); template OCTAVE_API void write_value<octave_int64> (std::ostream& os, const octave_int64& value); template OCTAVE_API void write_value<octave_uint8> (std::ostream& os, const octave_uint8& value); template OCTAVE_API void write_value<octave_uint16> (std::ostream& os, const octave_uint16& value); template OCTAVE_API void write_value<octave_uint32> (std::ostream& os, const octave_uint32& value); template OCTAVE_API void write_value<octave_uint64> (std::ostream& os, const octave_uint64& value); // Note: precision is supposed to be managed outside of this function by // setting stream parameters. template <> OCTAVE_API void write_value (std::ostream& os, const double& value) { if (lo_ieee_is_NA (value)) os << "NA"; else if (lo_ieee_isnan (value)) os << "NaN"; else if (lo_ieee_isinf (value)) os << (value < 0 ? "-Inf" : "Inf"); else os << value; } template <> OCTAVE_API void write_value (std::ostream& os, const Complex& value) { os << '('; write_value<double> (os, real (value)); os << ','; write_value<double> (os, imag (value)); os << ')'; } // Note: precision is supposed to be managed outside of this function by // setting stream parameters. template <> OCTAVE_API void write_value (std::ostream& os, const float& value) { if (lo_ieee_is_NA (value)) os << "NA"; else if (lo_ieee_isnan (value)) os << "NaN"; else if (lo_ieee_isinf (value)) os << (value < 0 ? "-Inf" : "Inf"); else os << value; } template <> OCTAVE_API void write_value (std::ostream& os, const FloatComplex& value) { os << '('; write_value<float> (os, real (value)); os << ','; write_value<float> (os, imag (value)); os << ')'; } namespace math { bool int_multiply_overflow (int a, int b, int *r) { return octave_i_multiply_overflow_wrapper (a, b, r); } bool int_multiply_overflow (long int a, long int b, long int *r) { return octave_li_multiply_overflow_wrapper (a, b, r); } #if defined (OCTAVE_HAVE_LONG_LONG_INT) bool int_multiply_overflow (long long int a, long long int b, long long int *r) { return octave_lli_multiply_overflow_wrapper (a, b, r); } #endif bool int_multiply_overflow (unsigned int a, unsigned int b, unsigned int *r) { return octave_ui_multiply_overflow_wrapper (a, b, r); } bool int_multiply_overflow (unsigned long int a, unsigned long int b, unsigned long int *r) { return octave_uli_multiply_overflow_wrapper (a, b, r); } #if defined (OCTAVE_HAVE_UNSIGNED_LONG_LONG_INT) bool int_multiply_overflow (unsigned long long int a, unsigned long long int b, unsigned long long int *r) { return octave_ulli_multiply_overflow_wrapper (a, b, r); } #endif } }