ddi_strtoll, ddi_strtoull - string conversion functions
int ddi_strtoll(const char *str, char **endptr, int base,
int ddi_strtoull(const char *str, char **endptr, int base,
pointer to a character string to be converted
post-conversion final string of unrecognized characters
radix used for conversion
pointer to variable which contains the converted value
Solaris DDI specific (Solaris DDI)
The ddi_strtoll() function converts the initial portion of the string
pointed to by str to a type longlong_t representation and stores the
converted value in result.
The ddi_strtoull() function converts the initial portion of the string
pointed to by str to a type u_longlong_t 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 charac‐
ters (" ", "\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_strtoll() function then attempts to convert the subject
sequence to an integer and returns the result. The ddi_strtoull() func‐
tion 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 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
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
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.
Upon successful completion, these functions return 0 and store the con‐
verted 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.
These functions may be called from user, kernel or interrupt context.
See attributes(5) for descriptions of the following attributes:
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
│Interface Stability │ Committed │
Writing Device Drivers
Feb 25, 2009 DDI_STRTOLL(9F)