ddi_strtol(9F) Kernel Functions for Drivers ddi_strtol(9F)NAMEddi_strtol - String conversion routines
SYNOPSIS
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_strtol(const char *str, char **endptr, int base, long *result);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI)
PARAMETERS
str Pointer to a character string to be converted.
endptr Post-conversion final string of unrecognized charac‐
ters.
base Radix used for conversion.
result Pointer to variable which contains the converted value.
DESCRIPTION
The ddi_strtol() function converts the initial portion of the string
pointed to by str to a type long int representation and stores the con‐
verted value in result.
The function first decomposes the input string into three parts:
1. An initial (possibly empty) sequence of white-space characters ('
', '\t', '\n', '\r', '\f')
2. A subject sequence interpreted as an integer represented in some
radix determined by the value of base
3. A final string of one or more unrecognized characters, including
the terminating null byte of the input string.
The ddi_strtol() function then attempts to convert the subject sequence
to an integer and returns the result.
If the value of base 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 con‐
stant 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.
If the value of base is between 2 and 36, the expected form of the sub‐
ject sequence is a sequence of letters and digits representing an inte‐
ger with the radix specified by base, 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 base are permitted. If the value of base is 16, the
characters 0x or 0X may optionally precede the sequence of letters and
digits following the sign, if present.
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 charac‐
ters 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.
If the subject sequence has the expected form and the value of base is
0, the sequence of characters starting with the first digit is inter‐
preted as an integer constant. If the subject sequence has the
expected form and the value of base is between 2 and 36, it is used as
the base 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 endptr, provided that endptr is
not a null pointer.
If the subject sequence is empty or does not have the expected form, no
conversion is performed and the value of str is stored in the object
pointed to by endptr, provided that endptr is not a null pointer.
RETURN VALUES
Upon successful completion, ddi_strtol() returns 0 and stores the con‐
verted value in result. If no conversion is performed due to invalid
base, ddi_strtol() returns EINVAL and the variable pointed by result is
not changed.
If the correct value is outside the range of representable values,
ddi_strtol() returns ERANGE and the value pointed to by result is not
changed.
CONTEXT
The ddi_strtol() function may be called from user, kernel or interrupt
context.
SEE ALSO
Writing Device Drivers
SunOS 5.10 13 May 2004 ddi_strtol(9F)
