53 lines
2 KiB
C
53 lines
2 KiB
C
/* Convert string to floating-point number, using the C locale.
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Copyright (C) 2003-2004, 2009-2025 Free Software 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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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Parse the initial portion of the string pointed to by NPTR as a floating-
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point number (in decimal or hexadecimal notation), like in the C locale:
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accepting only the ASCII digits '0'..'9', and only '.' as decimal point
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character.
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If ENDPTR is not NULL, set *ENDPTR to point to the first byte beyond the
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parsed number or to NPTR if the string does not start with a parsable
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number.
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Return value:
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- If successful, return the value as a float, double, or 'long double',
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respectively, and don't modify errno.
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- In case of overflow, return ±HUGE_VAL or ±HUGE_VALL, respectively, and
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set errno to ERANGE.
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- In case of underflow, return a value very near to 0 and set errno to
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ERANGE.
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- If the string does not start with a number at all, return 0 (and recall
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that if ENDPTR != NULL, *ENDPTR is set to NPTR), and maybe set errno to
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EINVAL.
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- In case of other error, return 0 and set errno, for example to ENOMEM. */
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extern float c_strtof (char const *nptr, char **endptr);
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extern double c_strtod (char const *nptr, char **endptr);
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extern long double c_strtold (char const *nptr, char **endptr);
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#ifdef __cplusplus
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}
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#endif
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/*
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* Hey Emacs!
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* Local Variables:
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* coding: utf-8
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* End:
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*/
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