Kernel Functions for Drivers ddistrtoll(9F)
NAME
ddistrtoll, ddistrtoull - string conversion functions
SYNOPSIS
#include
#include
int ddistrtoll(const char *str, char **endptr, int base,
longlongt *result);
int ddistrtoull(const char *str, char **endptr, int base,
ulonglongt *result);
PARAMETERS
str pointer to a character string to be converted
endptr post-conversion final string of unrecognized char-
acters
base radix used for conversion
result pointer to variable which contains the converted
value
INTERFACE LEVEL
Solaris DI specific (Solaris DI)
DESCRIPTION
The ddistrtoll() function converts the initial portion of
the string pointed to by str to a type longlongt represen-
tation and stores the converted value in result.
The ddistrtoull() function converts the initial portion of
the string pointed to by str to a type ulonglongt
representation and stores the converted value in result.
These functions 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
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Kernel Functions for Drivers ddistrtoll(9F)
of base
3. A final string of one or more unrecognized charac-
ters, including the terminating null byte of the
input string.
The ddistrtoll() function then attempts to convert the sub-
ject sequence to an integer and returns the result. The
ddistrtoull() function attempts to convert the subject
sequence to an unsigned integer and returns the result.
If the value of base is 0, the expected form of the subject
sequence is that of 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 option-
ally followed by a sequence of the digits 0 to 7 only. A
hexadecimal constant consists of the prefix 0x or 0X fol-
lowed 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 subject sequence is a sequence of letters and digits
representing an integer 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 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.
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 interpreted 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
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Kernel Functions for Drivers ddistrtoll(9F)
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, these functions return 0 and
store the converted value in result. If no conversion is
performed due to an invalid base, these functions return
EINVAL and the variable pointed by result is not changed.
CONTEXT
These functions may be called from user, kernel or interrupt
context.
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Interface Stability Committed
SEE ALSO
Writing Device Drivers
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