MirOS Manual: strtod(3), strtof(3)

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

NAME

     strtod, strtof - convert ASCII string to floating point

SYNOPSIS

     #include <stdlib.h>

     double
     strtod(const char *nptr, char **endptr);

     float
     strtof(const char *nptr, char **endptr);

DESCRIPTION

     These conversion functions convert the initial portion of the string
     pointed to by nptr to double or float representation, respectively.

     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 consists
     of an 'E' or 'e', followed by an optional plus or minus sign, followed by
     a sequence of digits.

     Leading whitespace characters in the string (as defined by the isspace(3)
     function) are skipped.

RETURN VALUES

     The strtod() and strtof() functions return the converted value, if any.

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

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

     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
     errno. If the correct value would cause underflow, zero is returned and
     ERANGE is stored in errno.

ERRORS

     [ERANGE]      Overflow or underflow occurred.

SEE ALSO

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

STANDARDS

     The strtod() function conforms to ANSI X3.159-1989 ("ANSI C").

HISTORY

     The strtof() function was added to MirOS in 2013.

MirOS BSD #10-current          February 9, 2014                              1

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