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138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/* Implementation of strtod for systems with atof.
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Copyright (C) 1991-2023 Free Software Foundation, Inc.
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This file is part of the libiberty library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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/*
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@deftypefn Supplemental double strtod (const char *@var{string}, @
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char **@var{endptr})
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This ISO C function converts the initial portion of @var{string} to a
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@code{double}. If @var{endptr} is not @code{NULL}, a pointer to the
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character after the last character used in the conversion is stored in
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the location referenced by @var{endptr}. If no conversion is
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performed, zero is returned and the value of @var{string} is stored in
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the location referenced by @var{endptr}.
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@end deftypefn
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*/
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#include "ansidecl.h"
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#include "safe-ctype.h"
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extern double atof (const char *);
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/* Disclaimer: this is currently just used by CHILL in GDB and therefore
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has not been tested well. It may have been tested for nothing except
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that it compiles. */
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double
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strtod (char *str, char **ptr)
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{
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char *p;
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if (ptr == (char **)0)
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return atof (str);
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p = str;
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while (ISSPACE (*p))
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++p;
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if (*p == '+' || *p == '-')
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++p;
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/* INF or INFINITY. */
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if ((p[0] == 'i' || p[0] == 'I')
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&& (p[1] == 'n' || p[1] == 'N')
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&& (p[2] == 'f' || p[2] == 'F'))
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{
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if ((p[3] == 'i' || p[3] == 'I')
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&& (p[4] == 'n' || p[4] == 'N')
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&& (p[5] == 'i' || p[5] == 'I')
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&& (p[6] == 't' || p[6] == 'T')
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&& (p[7] == 'y' || p[7] == 'Y'))
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{
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*ptr = p + 8;
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return atof (str);
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}
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else
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{
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*ptr = p + 3;
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return atof (str);
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}
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}
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/* NAN or NAN(foo). */
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if ((p[0] == 'n' || p[0] == 'N')
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&& (p[1] == 'a' || p[1] == 'A')
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&& (p[2] == 'n' || p[2] == 'N'))
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{
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p += 3;
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if (*p == '(')
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{
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++p;
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while (*p != '\0' && *p != ')')
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++p;
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if (*p == ')')
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++p;
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}
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*ptr = p;
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return atof (str);
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}
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/* digits, with 0 or 1 periods in it. */
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if (ISDIGIT (*p) || *p == '.')
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{
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int got_dot = 0;
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while (ISDIGIT (*p) || (!got_dot && *p == '.'))
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{
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if (*p == '.')
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got_dot = 1;
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++p;
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}
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/* Exponent. */
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if (*p == 'e' || *p == 'E')
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{
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int i;
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i = 1;
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if (p[i] == '+' || p[i] == '-')
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++i;
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if (ISDIGIT (p[i]))
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{
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while (ISDIGIT (p[i]))
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++i;
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*ptr = p + i;
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return atof (str);
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}
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}
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*ptr = p;
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return atof (str);
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}
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/* Didn't find any digits. Doesn't look like a number. */
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*ptr = str;
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return 0.0;
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}
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