4.4BSD/usr/share/man/cat3/strtod.0

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STRTOD(3)                   BSD Programmer's Manual                  STRTOD(3)

NNAAMMEE
     ssttrrttoodd - convert ASCII string to double

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssttddlliibb..hh>>

     _d_o_u_b_l_e
     ssttrrttoodd(_c_o_n_s_t _c_h_a_r _*_n_p_t_r, _c_h_a_r _*_*_e_n_d_p_t_r);

DDEESSCCRRIIPPTTIIOONN
     The ssttrrttoodd() function converts the initial portion of the string pointed
     to by _n_p_t_r to _d_o_u_b_l_e representation.

     The expected form of the string is an optional plus (``+'') or minus sign
     (``-'') followed by a sequence of digits optionally containing a decimal-
     point character, optionally followed by an exponent.  An exponent con-
     sists of an ``E'' or ``e'', followed by an optional plus or minus sign,
     followed by a sequence of digits.

     Leading white-space characters in the string (as defined by the iss-
     pace(3) function) are skipped.

RREETTUURRNN VVAALLUUEESS
     The ssttrrttoodd() function returns the converted value, if any.

     If _e_n_d_p_t_r is not NULL, a pointer to the character after the last charac-
     ter used in the conversion is stored in the location referenced by
     _e_n_d_p_t_r.

     If no conversion is performed, zero is returned and the value of _n_p_t_r is
     stored in the location referenced by _e_n_d_p_t_r.

     If the correct value would cause overflow, plus or minus HUGE_VAL is re-
     turned (according to the sign of the value), and ERANGE is stored in
     _e_r_r_n_o. If the correct value would cause underflow, zero is returned and
     ERANGE is stored in _e_r_r_n_o.

EERRRROORRSS
     [ERANGE]  Overflow or underflow occurred.

SSEEEE AALLSSOO
     atof(3),  atoi(3),  atol(3),  strtol(3),  strtoul(3)

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

AAUUTTHHOORRSS
     The author of this software is David M. Gay.

     Copyright (c) 1991 by AT&T.

     Permission to use, copy, modify, and distribute this software for any
     purpose without fee is hereby granted, provided that this entire notice
     is included in all copies of any software which is or includes a copy or
     modification of this software and in all copies of the supporting docu-
     mentation for such software.

     THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
     WARRANTY.  IN PARTICULAR, NEITHER THE AUTHOR NOR AT&T MAKES ANY REPRESEN-
     TATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS
     SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.


     Contact your vendor for a free copy of the source code to ssttrrttoodd() and
     accompanying functions.

4.4BSD                           June 4, 1993                                2