strtoul(3) - NetBSD Manual Pages

Command:
Section:
Arch:
Collection:
>>>
STRTOUL(3)                NetBSD Programmer's Manual                STRTOUL(3)


NAME

     strtoul, strtouq - convert a string to an unsigned long or uquad_t


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <stdlib.h>
     #include <limits.h>

     unsigned long
     strtoul(const char *nptr, char **endptr, int base);


     #include <sys/types.h>
     #include <stdlib.h>
     #include <limits.h>

     u_quad_t
     strtouq(const char *nptr, char **endptr, int base);


DESCRIPTION

     The strtoul() function converts the string in nptr to an unsigned long
     value.  The strtouq() function converts the string in nptr to a u_quad_t
     value.  The conversion is done according to the given base, which must be
     between 2 and 36 inclusive, or be the special value 0.

     The string may begin with an arbitrary amount of white space (as deter-
     mined by isspace(3)) followed by a single optional `+' or `-' sign.  If
     base is zero or 16, the string may then include a `0x' prefix, and the
     number will be read in base 16; otherwise, a zero base is taken as 10
     (decimal) unless the next character is `0', in which case it is taken as
     8 (octal).

     The remainder of the string is converted to an unsigned long value in the
     obvious manner, stopping at the end of the string or at the first charac-
     ter that does not produce a valid digit in the given base.  (In bases
     above 10, the letter `A' in either upper or lower case represents 10, `B'
     represents 11, and so forth, with `Z' representing 35.)

     If endptr is non nil, strtoul() stores the address of the first invalid
     character in *endptr.  If there were no digits at all, however, strtoul()
     stores the original value of nptr in *endptr.  (Thus, if *nptr is not
     `\0' but **endptr is `\0' on return, the entire string was valid.)


RETURN VALUES

     The strtoul() function returns either the result of the conversion or, if
     there was a leading minus sign, the negation of the result of the conver-
     sion, unless the original (non-negated) value would overflow; in the lat-
     ter case, strtoul() returns ULONG_MAX and sets the global variable errno
     to ERANGE.


ERRORS

     [ERANGE]      The given string was out of range; the value converted has
                   been clamped.


SEE ALSO

     strtol(3)


STANDARDS

     The strtoul() function conforms to ANSI X3.159-1989 (``ANSI C'').


BUGS

     Ignores the current locale.

NetBSD 1.4                       June 4, 1993                                1