ddi_strtoul(9F) 					   Kernel Functions for Drivers 					   ddi_strtoul(9F)

NAME

       ddi_strtoul - String conversion functions

SYNOPSIS

       #include <sys/ddi.h>
       #include <sys/sunddi.h>

       int ddi_strtoul(const char *str, char **endptr, int base, unsigned 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 characters.

       base	       Radix used for conversion.

       result	       Pointer to variable which contains the converted value.

DESCRIPTION

       The  ddi_strtoul()  function  converts  the  initial portion of the string pointed to by str to a type unsigned long int representation and
       stores the converted value in result.

       The  function first decomposes the input string into three parts:

       1.  An initial (possibly empty) sequence of white-space characters (' ', '	', '
', '
', '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_strtoul() function then 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  con-
       stant, 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.

       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
       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_strtoul() returns 0 and stores the converted value in result. If no conversion is performed due to  invalid
       base, ddi_strtoul() returns EINVAL and the variable pointed by result is not changed.

       If  the correct value is outside the range  of representable values, ddi_strtoul() returns ERANGE and the value pointed to by result is not
       changed.

CONTEXT

       The ddi_strtoul() function may be called from user, kernel or interrupt context.

SEE ALSO

       Writing Device Drivers

SunOS 5.10							    13 May 2004 						   ddi_strtoul(9F)