'\" te
.\"  Copyright (c) 2004, Sun Microsystems, Inc.  All Rights Reserved
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License.
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.  See the License for the specific language governing permissions and limitations under the License.
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.TH ddi_strtol 9F "13 May 2004" "SunOS 5.11" "Kernel Functions for Drivers"
.SH NAME
ddi_strtol \- String conversion routines
.SH SYNOPSIS
.LP
.nf
#include <sys/ddi.h> 
#include <sys/sunddi.h>

\fBint\fR \fBddi_strtol\fR(\fBconst char *\fR\fIstr\fR, \fBchar **\fR\fIendptr\fR, \fBint\fR \fIbase\fR, 
     \fBlong *\fR\fIresult\fR);
.fi

.SH INTERFACE LEVEL
.sp
.LP
Solaris DDI specific (Solaris DDI)
.SH PARAMETERS
.sp
.ne 2
.mk
.na
\fB\fIstr\fR \fR
.ad
.RS 11n
.rt  
Pointer to a character string to be converted.
.RE

.sp
.ne 2
.mk
.na
\fB\fIendptr\fR \fR
.ad
.RS 11n
.rt  
Post-conversion final string of unrecognized characters.
.RE

.sp
.ne 2
.mk
.na
\fB\fIbase\fR\fR
.ad
.RS 11n
.rt  
Radix used for conversion.
.RE

.sp
.ne 2
.mk
.na
\fB\fIresult\fR \fR
.ad
.RS 11n
.rt  
Pointer to variable which contains the converted value.
.RE

.SH DESCRIPTION
.sp
.LP
The \fBddi_strtol()\fR function converts the initial portion of the string
pointed to by \fIstr\fR to a type \fBlong\fR int representation and stores the
converted value in result.
.sp
.LP
The  function first decomposes the input string into three parts:
.RS +4
.TP
1.
An initial (possibly empty) sequence of white-space characters
(' ', '\et', '\en', '\er', '\ef')
.RE
.RS +4
.TP
2.
A subject sequence interpreted as an integer represented in some radix
determined by the value of \fIbase\fR
.RE
.RS +4
.TP
3.
A final  string of one or more unrecognized characters, including the
terminating null byte of the input string.
.RE
.sp
.LP
The \fBddi_strtol()\fR function then attempts to convert the subject sequence
to an integer and returns the result.
.sp
.LP
If the value of \fIbase\fR is 0, the expected form of the subject sequence is a
decimal constant, octal constant or hexadecimal constant, any of which may be
preceded by a plus ("+") or minus ("-") sign. A decimal constant begins with a
non-zero digit, and consists of a sequence of decimal digits. An octal
constant consists of the prefix 0 optionally followed by a sequence of the
digits 0 to 7 only. A hexadecimal  constant  consists of the prefix 0x or 0X
followed by a sequence of the decimal digits and letters a (or A) to f (or F)
with values 10 to 15 respectively.
.sp
.LP
If the value of \fIbase\fR is between 2 and 36, the expected form of the
subject sequence is a sequence of letters and digits representing an integer
with the radix specified by \fIbase\fR, optionally preceded by a plus or minus
sign. The letters from a (or A) to z (or Z) inclusive are ascribed the values
10 to 35 and only letters whose ascribed values are less than that of
\fIbase\fR are permitted. If the value of \fIbase\fR is 16, the characters 0x
or 0X may optionally precede the sequence of letters and digits following the
sign, if present.
.sp
.LP
The subject sequence is defined as the longest initial subsequence of the input
string, starting with the first non-white-space character that is of the
expected form. The subject  sequence contains no characters if the input string
is empty or consists entirely of white-space characters or if the first
non-white-space character is other than a sign or a permissible letter or
digit.
.sp
.LP
If the subject sequence has the expected form and the value of \fIbase\fR is 0,
the sequence of characters starting with the first digit is interpreted as an
integer constant. If  the subject sequence has the expected form and the value
of \fIbase\fR is between 2 and 36, it is used as the \fIbase\fR for
conversion, ascribing to each letter its value as given above. If the subject
sequence begins with a minus sign, the value resulting from the conversion is
negated. A pointer to the final string is stored in the object pointed to by
\fIendptr\fR, provided that \fIendptr\fR is not a null pointer.
.sp
.LP
If the subject sequence is empty or does not have the expected form, no
conversion is performed and the value of \fIstr\fR is stored in the object
pointed to by \fIendptr\fR, provided  that \fIendptr\fR is not a null pointer.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fBddi_strtol()\fR returns \fB0\fR and stores the
converted value in \fIresult\fR. If no conversion is performed due to invalid
\fIbase\fR, \fBddi_strtol()\fR returns \fBEINVAL\fR and the variable pointed by
\fIresult\fR is not changed.
.sp
.LP
If the correct value is outside the range  of representable values,
\fBddi_strtol()\fR returns \fBERANGE\fR and the value pointed to by
\fIresult\fR is not changed.
.SH CONTEXT
.sp
.LP
The \fBddi_strtol()\fR function may be called from user, kernel or interrupt
context.
.SH SEE ALSO
.sp
.LP
\fIWriting Device Drivers\fR