explain_strtold_or_die(3) Library Functions Manual explain_strtold_or_die(3)NAME
explain_strtold_or_die - convert string to number and report errors
SYNOPSIS
#include <libexplain/strtold.h>
long double explain_strtold_or_die(const char *nptr, char **endptr);
long double explain_strtold_on_error(const char *nptr, char **endptr))
DESCRIPTION
The explain_strtold_or_die function is used to call the strtold(3) system call. On failure an explanation will be printed to stderr,
obtained from the explain_strtold(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_strtold_on_error function is used to call the strtold(3) system call. On failure an explanation will be printed to stderr,
obtained from the explain_strtold(3) function, but still returns to the caller.
nptr The nptr, exactly as to be passed to the strtold(3) system call.
endptr The endptr, exactly as to be passed to the strtold(3) system call.
RETURN VALUE
The explain_strtold_or_die function only returns on success, see strtold(3) for more information. On failure, prints an explanation and
exits, it does not return.
The explain_strtold_on_error function always returns the value return by the wrapped strtold(3) system call.
EXAMPLE
The explain_strtold_or_die function is intended to be used in a fashion similar to the following example:
long double result = explain_strtold_or_die(nptr, endptr);
SEE ALSO strtold(3)
convert ASCII string to floating-point number
explain_strtold(3)
explain strtold(3) errors
exit(2) terminate the calling process
COPYRIGHT
libexplain version 0.52
Copyright (C) 2009 Peter Miller
explain_strtold_or_die(3)
Check Out this Related Man Page
STRTOD(3) BSD Library Functions Manual STRTOD(3)NAME
strtod, strtof, strtold -- convert ASCII string to double, float, or long double
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
double
strtod(const char * restrict nptr, char ** restrict endptr);
float
strtof(const char * restrict nptr, char ** restrict endptr);
long double
strtold(const char * restrict nptr, char ** restrict endptr);
DESCRIPTION
The strtod() function converts the initial portion of the string pointed to by nptr to double representation.
The strtof() function converts the initial portion of the string pointed to by nptr to float representation.
The strtold() function converts the initial portion of the string pointed to by nptr to long double representation.
The expected form of the string is an optional plus ('+') or minus sign ('-') followed by one of the following:
- 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.
- one of INF or INFINITY, ignoring case.
- one of NAN or NAN(n-char-sequence-opt), ignoring case. This implementation currently does not interpret such a sequence.
Leading white-space characters in the string (as defined by the isspace(3) function) are skipped.
RETURN VALUES
The strtod(), strtof(), and strtold() functions return the converted value, if any.
A character sequence INF or INFINITY is converted to infinity, if supported, else to the largest finite floating-point number representable
on the machine (i.e., VAX).
A character sequence NAN or NAN(n-char-sequence-opt) is converted to a quiet NaN, if supported, else remains unrecognized (i.e., VAX).
If endptr is not NULL, a pointer to the character after the last character 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, HUGE_VALF, or HUGE_VALL is returned (according to the return type and 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), math(3), strtol(3), strtoul(3)STANDARDS
The strtod() function conforms to ANSI X3.159-1989 (``ANSI C89''). The strtof() and strtold() functions conform to ISO/IEC 9899:1999
(``ISO C99'').
HISTORY
The strtof() and strtold() functions appeared in NetBSD 4.0.
BSD March 12, 2006 BSD