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-.\" Copyright (c) 1990, 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Chris Torek and 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. 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.
-.\"
-.\"     $OpenBSD: strtoul.3,v 1.24 2014/11/30 21:21:59 schwarze Exp $
-.\"
-.Dd $Mdocdate: November 30 2014 $
-.Dt STRTOUL 3
-.Os
-.Sh NAME
-.Nm strtoul ,
-.Nm strtoull ,
-.Nm strtoumax ,
-.Nm strtouq
-.Nd convert a string to an unsigned long, unsigned long long or uintmax_t integer
-.Sh SYNOPSIS
-.In limits.h
-.In stdlib.h
-.Ft unsigned long
-.Fn strtoul "const char *nptr" "char **endptr" "int base"
-.Ft unsigned long long
-.Fn strtoull "const char *nptr" "char **endptr" "int base"
-.In inttypes.h
-.Ft uintmax_t
-.Fn strtoumax "const char *nptr" "char **endptr" "int base"
-.In sys/types.h
-.In limits.h
-.In stdlib.h
-.Ft u_quad_t
-.Fn strtouq "const char *nptr" "char **endptr" "int base"
-.Sh DESCRIPTION
-The
-.Fn strtoul
-function converts the string in
-.Fa nptr
-to an
-.Vt unsigned long
-value.
-The
-.Fn strtoull
-function converts the string in
-.Fa nptr
-to an
-.Vt unsigned long long
-value.
-The
-.Fn strtoumax
-function converts the string in
-.Fa nptr
-to a
-.Vt umaxint_t
-value.
-The
-.Fn strtouq
-function is a deprecated equivalent of
-.Fn strtoull
-and is provided for backwards compatibility with legacy programs.
-The conversion is done according to the given
-.Fa base ,
-which must be a number between 2 and 36 inclusive or the special value 0.
-If the string in
-.Fa nptr
-represents a negative number, it will be converted to its unsigned equivalent.
-This behavior is consistent with what happens when a signed integer type is
-cast to its unsigned counterpart.
-.Pp
-The string may begin with an arbitrary amount of whitespace
-(as determined by
-.Xr isspace 3 )
-followed by a single optional
-.Ql +
-or
-.Ql -
-sign.
-If
-.Fa base
-is zero or 16, the string may then include a
-.Ql 0x
-prefix, and the number will be read in base 16; otherwise, a zero
-.Fa base
-is taken as 10 (decimal) unless the next character is
-.Ql 0 ,
-in which case it is taken as 8 (octal).
-.Pp
-The remainder of the string is converted to an
-.Vt unsigned long ,
-.Vt unsigned long long ,
-or
-.Vt uintmax_t
-value in the obvious manner,
-stopping at the first character which is not a valid digit
-in the given base.
-(In bases above 10, the letter
-.Ql A
-in either upper or lower case represents 10,
-.Ql B
-represents 11, and so forth, with
-.Ql Z
-representing 35.)
-.Pp
-If
-.Fa endptr
-is non-null,
-.Fn strtoul
-stores the address of the first invalid character in
-.Fa *endptr .
-If there were no digits at all, however,
-.Fn strtoul
-stores the original value of
-.Fa nptr
-in
-.Fa *endptr .
-(Thus, if
-.Fa *nptr
-is not
-.Ql \e0
-but
-.Fa **endptr
-is
-.Ql \e0
-on return, the entire string was valid.)
-.Sh RETURN VALUES
-The
-.Fn strtoul ,
-.Fn strtoull ,
-.Fn strtoumax
-and
-.Fn strtouq
-functions return either the result of the conversion or,
-if there was a leading minus sign,
-the negation of the result of the conversion,
-unless the original (non-negated) value would overflow.
-If overflow occurs,
-.Fn strtoul
-returns
-.Dv ULONG_MAX ,
-.Fn strtoull
-returns
-.Dv ULLONG_MAX ,
-.Fn strtoumax
-returns
-.Dv UINTMAX_MAX ,
-.Fn strtouq
-returns
-.Dv ULLONG_MAX
-and the global variable
-.Va errno
-is set to
-.Er ERANGE .
-.Pp
-There is no way to determine if
-.Fn strtoul
-has processed a negative number (and returned an unsigned value) short of
-examining the string in
-.Fa nptr
-directly.
-.Pp
-If there is no valid digit, 0 is returned.
-If
-.Ar base
-is invalid, 0 is returned and the global variable
-.Va errno
-is set to
-.Er EINVAL .
-.Sh EXAMPLES
-Ensuring that a string is a valid number (i.e., in range and containing no
-trailing characters) requires clearing
-.Va errno
-beforehand explicitly since
-.Va errno
-is not changed on a successful call to
-.Fn strtoul ,
-and the return value of
-.Fn strtoul
-cannot be used unambiguously to signal an error:
-.Bd -literal -offset indent
-char *ep;
-unsigned long ulval;
-
-\&...
-
-errno = 0;
-ulval = strtoul(buf, &ep, 10);
-if (buf[0] == '\e0' || *ep != '\e0')
-        goto not_a_number;
-if (errno == ERANGE && ulval == ULONG_MAX)
-        goto out_of_range;
-.Ed
-.Pp
-This example will accept
-.Dq 12
-but not
-.Dq 12foo
-or
-.Dq 12\en .
-If trailing whitespace is acceptable, further checks must be done on
-.Va *ep ;
-alternately, use
-.Xr sscanf 3 .
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The value of
-.Ar base
-was neither between 2 and 36 inclusive nor the special value 0.
-.It Bq Er ERANGE
-The given string was out of range; the value converted has been clamped.
-.El
-.Sh SEE ALSO
-.Xr sscanf 3 ,
-.Xr strtol 3
-.Sh STANDARDS
-The
-.Fn strtoul ,
-.Fn strtoull ,
-and
-.Fn strtoumax
-functions conform to
-.St -isoC-99 .
-Setting
-.Va errno
-to
-.Dv EINVAL
-is an extension to that standard required by
-.St -p1003.1-2008 .
-.Pp
-The
-.Fn strtouq
-function is a
-.Bx
-extension and is provided for backwards compatibility with legacy programs.
-.Sh BUGS
-Ignores the current locale.