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strtol.0
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1992-08-10
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STRTOL(3) UNIX Programmer's Manual STRTOL(3)
NNAAMMEE
ssttrrttooll - convert string value to a long integer
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssttddlliibb..hh>>
##iinncclluuddee <<lliimmiittss..hh>>
_l_o_n_g
ssttrrttooll(_c_h_a_r _*_n_p_t_r, _c_h_a_r _*_*_e_n_d_p_t_r, _i_n_t _b_a_s_e)
DDEESSCCRRIIPPTTIIOONN
The ssttrrttooll() function converts the string in _n_p_t_r to a _l_o_n_g value accord
ing to the given _b_a_s_e, 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
_b_a_s_e is zero or 16, the string may then include a `0x' prefix, and the
number will be read in base 16; otherwise, a zero _b_a_s_e 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 a _l_o_n_g 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' represent
ing 35.)
If _e_n_d_p_t_r is non nil, ssttrrttooll() stores the address of the first invalid
character in _*_e_n_d_p_t_r. If there were no digits at all, however, ssttrrttooll()
stores the original value of _n_p_t_r in _*_e_n_d_p_t_r. (Thus, if _*_n_p_t_r is not `\0'
but _*_*_e_n_d_p_t_r is `\0' on return, the entire string was valid.)
RREETTUURRNN VVAALLUUEESS
The ssttrrttooll() function returns the result of the conversion, unless the
value would underflow or overflow. If an underflow occurs, ssttrrttooll() re
turns LONG_MIN. If an overflow occurs, ssttrrttooll() returns LONG_MAX. In both
cases, _e_r_r_n_o is set to ERANGE.
EERRRROORRSS
[ERANGE] The given string was out of range; the value converted has been
clamped.
SSEEEE AALLSSOO
atof(3), atoi(3), atol(3), strtod(3), strtoul(3)
SSTTAANNDDAARRDDSS
The ssttrrttooll() function conforms to ANSI C3.1591989 (``ANSI C'').
BBUUGGSS
Ignores the current locale.
BSD Experimental June 29, 1991 1