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BSD 2.11 - man page for strtol (bsd section 3)

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STRTOL(3)										STRTOL(3)

       strtol - convert string value to a long

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

       strtol(nptr, endptr, base)
       char *nptr;
       char **endptr;
       int base;

       The strtol() function converts the string in nptr to a long 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 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

       The  remainder  of the string is converted to a long value in the obvious 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 non nil, strtol() stores the  address  of  the  first  invalid  character  in
       *endptr	.  If there were no digits at all, however, strtol() 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.)

       The  strtol() function returns the result of the conversion, unless the value would under-
       flow or overflow.  If an underflow occurs, strtol()  returns  LONG_MIN.	 If  an  overflow
       occurs, strtol() returns LONG_MAX.  In both cases, errno is set to ERANGE .

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

       atof(3), atoi(3), atol(3), strtoul(3)

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

       Ignores the current locale.

4.4 Berkeley Distribution		 January 12, 1996				STRTOL(3)
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