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-.\" $OpenBSD: strtonum.3,v 1.19 2022/09/11 06:38:11 jmc Exp $
-.\"
-.\" Copyright (c) 2004 Ted Unangst
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: September 11 2022 $
-.Dt STRTONUM 3
-.Os
-.Sh NAME
-.Nm strtonum
-.Nd reliably convert string value to an integer
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft long long
-.Fo strtonum
-.Fa "const char *nptr"
-.Fa "long long minval"
-.Fa "long long maxval"
-.Fa "const char **errstr"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn strtonum
-function converts the string in
-.Fa nptr
-to a
-.Vt long long
-value.
-The
-.Fn strtonum
-function was designed to facilitate safe, robust programming
-and overcome the shortcomings of the
-.Xr atoi 3
-and
-.Xr strtol 3
-family of interfaces.
-.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.
-.Pp
-The remainder of the string is converted to a
-.Vt long long
-value according to base 10.
-.Pp
-The value obtained is then checked against the provided
-.Fa minval
-and
-.Fa maxval
-bounds.
-If
-.Fa errstr
-is non-null,
-.Fn strtonum
-stores an error string in
-.Fa *errstr
-indicating the failure.
-.Sh RETURN VALUES
-The
-.Fn strtonum
-function returns the result of the conversion,
-unless the value would exceed the provided bounds or is invalid.
-On error, 0 is returned,
-.Va errno
-is set, and
-.Fa errstr
-will point to an error message.
-.Fa *errstr
-will be set to
-.Dv NULL
-on success;
-this fact can be used to differentiate
-a successful return of 0 from an error.
-.Sh EXAMPLES
-Using
-.Fn strtonum
-correctly is meant to be simpler than the alternative functions.
-.Bd -literal -offset indent
-int iterations;
-const char *errstr;
-
-iterations = strtonum(optarg, 1, 64, &errstr);
-if (errstr != NULL)
-        errx(1, "number of iterations is %s: %s", errstr, optarg);
-.Ed
-.Pp
-The above example will guarantee that the value of iterations is between
-1 and 64 (inclusive).
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er ERANGE
-The given string was out of range.
-.It Bq Er EINVAL
-The given string did not consist solely of digit characters.
-.It Bq Er EINVAL
-.Ar minval
-was larger than
-.Ar maxval .
-.El
-.Pp
-If an error occurs,
-.Fa errstr
-will be set to one of the following strings:
-.Pp
-.Bl -tag -width "too largeXX" -compact
-.It Qq too large
-The result was larger than the provided maximum value.
-.It Qq too small
-The result was smaller than the provided minimum value.
-.It Qq invalid
-The string did not consist solely of digit characters.
-.El
-.Sh SEE ALSO
-.Xr atof 3 ,
-.Xr atoi 3 ,
-.Xr atol 3 ,
-.Xr atoll 3 ,
-.Xr sscanf 3 ,
-.Xr strtod 3 ,
-.Xr strtol 3 ,
-.Xr strtoul 3
-.Sh STANDARDS
-.Fn strtonum
-is an
-.Ox
-extension.
-The existing alternatives, such as
-.Xr atoi 3
-and
-.Xr strtol 3 ,
-are either impossible or difficult to use safely.
-.Sh HISTORY
-The
-.Fn strtonum
-function first appeared in
-.Ox 3.6 .