view doc/c-strtod.texi @ 17476:6057744acd2c default tip master

author Karl Berry <>
date Fri, 16 Aug 2013 06:32:22 -0700
parents e542fd46ad6f
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@c Documentation of gnulib module 'c-strtod'.

@c Copyright (C) 2008-2013 Free Software Foundation, Inc.

@c Permission is granted to copy, distribute and/or modify this document
@c under the terms of the GNU Free Documentation License, Version 1.3 or
@c any later version published by the Free Software Foundation; with no
@c Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
@c Texts.  A copy of the license is included in the ``GNU Free
@c Documentation License'' file as part of this distribution.

The @code{c-strtod} module contains a string to number (@samp{double})
conversion function operating on single-byte character strings, that operates
as if the locale encoding was ASCII.
(The "C" locale on many systems has the locale encoding "ASCII".)

The function is:
extern double c_strtod (const char *string, char **endp);
@end smallexample

In particular, only a period @samp{.} is accepted as decimal point, even
when the current locale's notion of decimal point is a comma @samp{,},
and no characters outside the basic character set are accepted.

On platforms without @code{strtod_l}, this function is not safe for use in
multi-threaded applications since it calls @code{setlocale}.