From 58f0484fa251c266ede97b591b499fe3dd4f578e Mon Sep 17 00:00:00 2001 From: "Rodney W. Grimes" Date: Fri, 27 May 1994 05:00:24 +0000 Subject: BSD 4.4 Lite Lib Sources --- lib/libc/stdlib/strtod.3 | 132 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100644 lib/libc/stdlib/strtod.3 (limited to 'lib/libc/stdlib/strtod.3') diff --git a/lib/libc/stdlib/strtod.3 b/lib/libc/stdlib/strtod.3 new file mode 100644 index 000000000000..e1d4c394d932 --- /dev/null +++ b/lib/libc/stdlib/strtod.3 @@ -0,0 +1,132 @@ +.\" Copyright (c) 1990, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" This code is derived from software contributed to Berkeley by +.\" the American National Standards Committee X3, on Information +.\" Processing Systems. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)strtod.3 8.1 (Berkeley) 6/4/93 +.\" +.Dd June 4, 1993 +.Dt STRTOD 3 +.Os +.Sh NAME +.Nm strtod +.Nd convert +.Tn ASCII +string to double +.Sh SYNOPSIS +.Fd #include +.Ft double +.Fn strtod "const char *nptr" "char **endptr" +.Sh DESCRIPTION +The +.Fn strtod +function converts the initial portion of the string +pointed to by +.Fa nptr +to +.Em double +representation. +.Pp +The expected form of the string is an optional plus (``+'') or minus +sign (``\-'') followed by a sequence of digits optionally containing +a decimal-point character, optionally followed by an exponent. +An exponent consists of an ``E'' or ``e'', followed by an optional plus +or minus sign, followed by a sequence of digits. +.Pp +Leading white-space characters in the string (as defined by the +.Xr isspace 3 +function) are skipped. +.Sh RETURN VALUES +The +.Fn strtod +function returns the converted value, if any. +.Pp +If +.Fa endptr +is not +.Dv NULL , +a pointer to the character after the last character used +in the conversion is stored in the location referenced by +.Fa endptr . +.Pp +If no conversion is performed, zero is returned and the value of +.Fa nptr +is stored in the location referenced by +.Fa endptr . +.Pp +If the correct value would cause overflow, plus or minus +.Dv HUGE_VAL +is returned (according to the sign of the value), and +.Dv ERANGE +is stored in +.Va errno . +If the correct value would cause underflow, zero is +returned and +.Dv ERANGE +is stored in +.Va errno . +.Sh ERRORS +.Bl -tag -width [ERANGE] +.It Bq Er ERANGE +Overflow or underflow occurred. +.Sh SEE ALSO +.Xr atof 3 , +.Xr atoi 3 , +.Xr atol 3 , +.Xr strtol 3 , +.Xr strtoul 3 +.Sh STANDARDS +The +.Fn strtod +function +conforms to +.St -ansiC . +.Sh AUTHORS +The author of this software is David M. Gay. +.Pp +Copyright (c) 1991 by AT&T. +.Pp +Permission to use, copy, modify, and distribute this software for any +purpose without fee is hereby granted, provided that this entire notice +is included in all copies of any software which is or includes a copy +or modification of this software and in all copies of the supporting +documentation for such software. +.Pp +THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED +WARRANTY. IN PARTICULAR, NEITHER THE AUTHOR NOR AT&T MAKES ANY +REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY +OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. +.Pp +Contact your vendor for a free copy of the source code to +.Fn strtod +and accompanying functions. -- cgit v1.2.3