strtoul - phpMan

STRTOUL(3)                 Linux Programmer’s Manual                STRTOUL(3)



NAME
       strtoul, strtoull, strtouq - convert a string to an unsigned long integer

SYNOPSIS
       #include <stdlib.h>

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

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

DESCRIPTION
       The  strtoul()  function  converts  the  initial  part  of the string in nptr to an
       unsigned long integer value according to the given base, which must  be  between  2
       and 36 inclusive, or be the special value 0.

       The  string  must  begin  with an arbitrary amount of white space (as determined 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 int value in the obvi-
       ous manner, stopping at the first character which is not 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 not NULL, strtoul() stores the address of the first invalid  character
       in *endptr.  If there were no digits at all, strtoul() stores the original value of
       nptr in *endptr (and returns 0).  In particular, if *nptr is not ‘\0’ but  **endptr
       is ‘\0’ on return, the entire string is valid.

       The  strtoull()  function  works  just  like  the strtoul() function but returns an
       unsigned long long integer value.

RETURN VALUE
       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 conversion, unless the
       original (non-negated) value would overflow; in the latter case, strtoul()  returns
       ULONG_MAX  and  sets the global variable errno to ERANGE.  Precisely the same holds
       for strtoull() (with ULLONG_MAX instead of ULONG_MAX).

ERRORS
       ERANGE The resulting value was out of range.

       EINVAL (not in C99) The given base contains an unsupported value.

       The implementation may also set errno to EINVAL in case no conversion was performed
       (no digits seen, and 0 returned).

NOTES
       In  locales  other  than  the "C" locale, also other strings may be accepted.  (For
       example, the thousands separator of the current locale may be supported.)

       BSD also has

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

       with completely analogous definition.  Depending on the  wordsize  of  the  current
       architecture, this may be equivalent to strtoull() or to strtoul().

CONFORMING TO
       strtoul()  conforms to SVID 3, BSD 4.3, ISO 9899 (C99) and POSIX, and strtoull() to
       ISO 9899 (C99) and POSIX 1003.1-2001.

SEE ALSO
       atof(3), atoi(3), atol(3), strtod(3), strtol(3)



GNU                               2002-05-30                        STRTOUL(3)

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