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/******************************************************************************
*
* Project: CPL - Common Portability Library
* Purpose: Functions to convert ASCII string to floating point number.
* Author: Andrey Kiselev, dron@ak4719.spb.edu.
*
******************************************************************************
* Copyright (c) 2006, Andrey Kiselev
* Copyright (c) 2008-2012, Even Rouault <even dot rouault at spatialys.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include "cpl_port.h"
#include "cpl_conv.h"
#include <cerrno>
#include <clocale>
#include <cstring>
#include <cstdlib>
#include <limits>
#include "cpl_config.h"
/************************************************************************/
/* CPLAtofDelim() */
/************************************************************************/
/**
* Converts ASCII string to floating point number.
*
* This function converts the initial portion of the string pointed to
* by nptr to double floating point representation. The behavior is the
* same as
*
* CPLStrtodDelim(nptr, (char **)NULL, point);
*
* This function does the same as standard atof(3), but does not take locale
* in account. Instead of locale defined decimal delimiter you can specify
* your own one. Also see notes for CPLAtof() function.
*
* @param nptr Pointer to string to convert.
* @param point Decimal delimiter.
*
* @return Converted value, if any.
*/
double CPLAtofDelim(const char *nptr, char point)
{
return CPLStrtodDelim(nptr, nullptr, point);
}
/************************************************************************/
/* CPLAtof() */
/************************************************************************/
/**
* Converts ASCII string to floating point number.
*
* This function converts the initial portion of the string pointed to
* by nptr to double floating point representation. The behavior is the
* same as
*
* CPLStrtod(nptr, (char **)NULL);
*
* This function does the same as standard atof(3), but does not take
* locale in account. That means, the decimal delimiter is always '.'
* (decimal point). Use CPLAtofDelim() function if you want to specify
* custom delimiter.
*
* IMPORTANT NOTE:
*
* Existence of this function does not mean you should always use it. Sometimes
* you should use standard locale aware atof(3) and its family. When you need to
* process the user's input (for example, command line parameters) use atof(3),
* because the user works in a localized environment and the user's input will
* be done according to the locale set. In particular that means we should not
* make assumptions about character used as decimal delimiter, it can be either
* "." or ",".
*
* But when you are parsing some ASCII file in predefined format, you most
* likely need CPLAtof(), because such files distributed across the systems
* with different locales and floating point representation should be
* considered as a part of file format. If the format uses "." as a delimiter
* the same character must be used when parsing number regardless of actual
* locale setting.
*
* @param nptr Pointer to string to convert.
*
* @return Converted value, if any.
*/
double CPLAtof(const char *nptr)
{
return CPLStrtod(nptr, nullptr);
}
/************************************************************************/
/* CPLAtofM() */
/************************************************************************/
/**
* Converts ASCII string to floating point number using any numeric locale.
*
* This function converts the initial portion of the string pointed to
* by nptr to double floating point representation. This function does the
* same as standard atof(), but it allows a variety of locale representations.
* That is it supports numeric values with either a comma or a period for
* the decimal delimiter.
*
* PS. The M stands for Multi-lingual.
*
* @param nptr The string to convert.
*
* @return Converted value, if any. Zero on failure.
*/
double CPLAtofM(const char *nptr)
{
const int nMaxSearch = 50;
for (int i = 0; i < nMaxSearch; i++)
{
if (nptr[i] == ',')
return CPLStrtodDelim(nptr, nullptr, ',');
if (nptr[i] == '.' || nptr[i] == '\0')
return CPLStrtodDelim(nptr, nullptr, '.');
}
return CPLStrtodDelim(nptr, nullptr, '.');
}
/************************************************************************/
/* CPLReplacePointByLocalePoint() */
/************************************************************************/
/* Return a newly allocated variable if substitution was done, or NULL
* otherwise.
*/
static char *CPLReplacePointByLocalePoint(const char *pszNumber, char point)
{
#if defined(__ANDROID__)
static char byPoint = 0;
if (byPoint == 0)
{
char szBuf[16] = {};
snprintf(szBuf, sizeof(szBuf), "%.1f", 1.0);
byPoint = szBuf[1];
}
if (point != byPoint)
{
const char *pszPoint = strchr(pszNumber, point);
if (pszPoint)
{
char *pszNew = CPLStrdup(pszNumber);
pszNew[pszPoint - pszNumber] = byPoint;
return pszNew;
}
}
#else // ndef __ANDROID__
struct lconv *poLconv = localeconv();
if (poLconv && poLconv->decimal_point && poLconv->decimal_point[0] != '\0')
{
char byPoint = poLconv->decimal_point[0];
if (point != byPoint)
{
const char *pszLocalePoint = strchr(pszNumber, byPoint);
const char *pszPoint = strchr(pszNumber, point);
if (pszPoint || pszLocalePoint)
{
char *pszNew = CPLStrdup(pszNumber);
if (pszLocalePoint)
pszNew[pszLocalePoint - pszNumber] = ' ';
if (pszPoint)
pszNew[pszPoint - pszNumber] = byPoint;
return pszNew;
}
}
}
#endif // __ANDROID__
return nullptr;
}
/************************************************************************/
/* CPLStrtodDelim() */
/************************************************************************/
/**
* Converts ASCII string to floating point number using specified delimiter.
*
* This function converts the initial portion of the string pointed to
* by nptr to double floating point representation. This function does the
* same as standard strtod(3), but does not take locale in account. Instead of
* locale defined decimal delimiter you can specify your own one. Also see
* notes for CPLAtof() function.
*
* @param nptr Pointer to string to convert.
* @param endptr If is not NULL, a pointer to the character after the last
* character used in the conversion is stored in the location referenced
* by endptr.
* @param point Decimal delimiter.
*
* @return Converted value, if any.
*/
double CPLStrtodDelim(const char *nptr, char **endptr, char point)
{
while (*nptr == ' ')
nptr++;
if (nptr[0] == '-')
{
if (STARTS_WITH(nptr, "-1.#QNAN") || STARTS_WITH(nptr, "-1.#IND"))
{
if (endptr)
*endptr = const_cast<char *>(nptr) + strlen(nptr);
// While it is possible on some platforms to flip the sign
// of NAN to negative, this function will always return a positive
// quiet (non-signalling) NaN.
return std::numeric_limits<double>::quiet_NaN();
}
if (strcmp(nptr, "-inf") == 0 || STARTS_WITH_CI(nptr, "-1.#INF"))
{
if (endptr)
*endptr = const_cast<char *>(nptr) + strlen(nptr);
return -std::numeric_limits<double>::infinity();
}
}
else if (nptr[0] == '1')
{
if (STARTS_WITH(nptr, "1.#QNAN") || STARTS_WITH(nptr, "1.#SNAN"))
{
if (endptr)
*endptr = const_cast<char *>(nptr) + strlen(nptr);
return std::numeric_limits<double>::quiet_NaN();
}
if (STARTS_WITH_CI(nptr, "1.#INF"))
{
if (endptr)
*endptr = const_cast<char *>(nptr) + strlen(nptr);
return std::numeric_limits<double>::infinity();
}
}
else if (nptr[0] == 'i' && strcmp(nptr, "inf") == 0)
{
if (endptr)
*endptr = const_cast<char *>(nptr) + strlen(nptr);
return std::numeric_limits<double>::infinity();
}
else if (nptr[0] == 'n' && strcmp(nptr, "nan") == 0)
{
if (endptr)
*endptr = const_cast<char *>(nptr) + strlen(nptr);
return std::numeric_limits<double>::quiet_NaN();
}
/* -------------------------------------------------------------------- */
/* We are implementing a simple method here: copy the input string */
/* into the temporary buffer, replace the specified decimal delimiter */
/* with the one, taken from locale settings and use standard strtod() */
/* on that buffer. */
/* -------------------------------------------------------------------- */
char *pszNewNumberOrNull = CPLReplacePointByLocalePoint(nptr, point);
const char *pszNumber = pszNewNumberOrNull ? pszNewNumberOrNull : nptr;
const double dfValue = strtod(pszNumber, endptr);
const int nError = errno;
if (endptr)
*endptr = const_cast<char *>(nptr) + (*endptr - pszNumber);
if (pszNewNumberOrNull)
CPLFree(pszNewNumberOrNull);
errno = nError;
return dfValue;
}
/************************************************************************/
/* CPLStrtod() */
/************************************************************************/
/**
* Converts ASCII string to floating point number.
*
* This function converts the initial portion of the string pointed to
* by nptr to double floating point representation. This function does the
* same as standard strtod(3), but does not take locale in account. That
* means, the decimal delimiter is always '.' (decimal point). Use
* CPLStrtodDelim() function if you want to specify custom delimiter. Also
* see notes for CPLAtof() function.
*
* @param nptr Pointer to string to convert.
* @param endptr If is not NULL, a pointer to the character after the last
* character used in the conversion is stored in the location referenced
* by endptr.
*
* @return Converted value, if any.
*/
double CPLStrtod(const char *nptr, char **endptr)
{
return CPLStrtodDelim(nptr, endptr, '.');
}
/************************************************************************/
/* CPLStrtofDelim() */
/************************************************************************/
/**
* Converts ASCII string to floating point number using specified delimiter.
*
* This function converts the initial portion of the string pointed to
* by nptr to single floating point representation. This function does the
* same as standard strtof(3), but does not take locale in account. Instead of
* locale defined decimal delimiter you can specify your own one. Also see
* notes for CPLAtof() function.
*
* @param nptr Pointer to string to convert.
* @param endptr If is not NULL, a pointer to the character after the last
* character used in the conversion is stored in the location referenced
* by endptr.
* @param point Decimal delimiter.
*
* @return Converted value, if any.
*/
float CPLStrtofDelim(const char *nptr, char **endptr, char point)
{
/* -------------------------------------------------------------------- */
/* We are implementing a simple method here: copy the input string */
/* into the temporary buffer, replace the specified decimal delimiter */
/* with the one, taken from locale settings and use standard strtof() */
/* on that buffer. */
/* -------------------------------------------------------------------- */
char *const pszNewNumberOrNull = CPLReplacePointByLocalePoint(nptr, point);
const char *pszNumber = pszNewNumberOrNull ? pszNewNumberOrNull : nptr;
const float fValue = strtof(pszNumber, endptr);
const int nError = errno;
if (endptr)
*endptr = const_cast<char *>(nptr) + (*endptr - pszNumber);
if (pszNewNumberOrNull)
CPLFree(pszNewNumberOrNull);
errno = nError;
return fValue;
}
/************************************************************************/
/* CPLStrtof() */
/************************************************************************/
/**
* Converts ASCII string to floating point number.
*
* This function converts the initial portion of the string pointed to
* by nptr to single floating point representation. This function does the
* same as standard strtof(3), but does not take locale in account. That
* means, the decimal delimiter is always '.' (decimal point). Use
* CPLStrtofDelim() function if you want to specify custom delimiter. Also
* see notes for CPLAtof() function.
*
* @param nptr Pointer to string to convert.
* @param endptr If is not NULL, a pointer to the character after the last
* character used in the conversion is stored in the location referenced
* by endptr.
*
* @return Converted value, if any.
*/
float CPLStrtof(const char *nptr, char **endptr)
{
return CPLStrtofDelim(nptr, endptr, '.');
}
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