72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
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/* error-checking interface to strtod-like functions
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Copyright (C) 1996, 1999-2000, 2003-2006, 2009-2020 Free Software
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Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Jim Meyering. */
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#include <config.h>
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#include "xstrtod.h"
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#if LONG
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# define XSTRTOD xstrtold
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# define DOUBLE long double
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#else
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# define XSTRTOD xstrtod
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# define DOUBLE double
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#endif
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/* An interface to a string-to-floating-point conversion function that
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encapsulates all the error checking one should usually perform.
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Like strtod/strtold, but stores the conversion in *RESULT,
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and returns true upon successful conversion.
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CONVERT specifies the conversion function, e.g., strtod itself. */
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bool
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XSTRTOD (char const *str, char const **ptr, DOUBLE *result,
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DOUBLE (*convert) (char const *, char **))
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{
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DOUBLE val;
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char *terminator;
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bool ok = true;
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errno = 0;
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val = convert (str, &terminator);
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/* Having a non-zero terminator is an error only when PTR is NULL. */
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if (terminator == str || (ptr == NULL && *terminator != '\0'))
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ok = false;
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else
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{
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/* Allow underflow (in which case CONVERT returns zero),
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but flag overflow as an error. The user can decide
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to use the limits in RESULT upon ERANGE. */
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if (val != 0 && errno == ERANGE)
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ok = false;
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}
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if (ptr != NULL)
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*ptr = terminator;
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*result = val;
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return ok;
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}
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