Provided by: libexplain-dev_1.4.D001-7_amd64 
NAME
explain_strtof - explain strtof(3) errors
SYNOPSIS
#include <libexplain/strtof.h>
const char *explain_strtof(const char *nptr, char **endptr);
const char *explain_errno_strtof(int errnum, const char *nptr, char **endptr);
void explain_message_strtof(char *message, int message_size, const char *nptr, char
**endptr);
void explain_message_errno_strtof(char *message, int message_size, int errnum, const char
*nptr, char **endptr);
DESCRIPTION
These functions may be used to obtain explanations for errors returned by the strtof(3)
system call.
explain_strtof
const char *explain_strtof(const char *nptr, char **endptr);
The explain_strtof function is used to obtain an explanation of an error returned by the
strtof(3) system call. The least the message will contain is the value of strerror(errno),
but usually it will do much better, and indicate the underlying cause in more detail.
The errno global variable will be used to obtain the error value to be decoded.
nptr The original nptr, exactly as passed to the strtof(3) system call.
endptr The original endptr, exactly as passed to the strtof(3) system call.
Returns:
The message explaining the error. This message buffer is shared by all libexplain
functions which do not supply a buffer in their argument list. This will be
overwritten by the next call to any libexplain function which shares this buffer,
including other threads.
Note: This function is not thread safe, because it shares a return buffer across all
threads, and many other functions in this library.
Example: This function is intended to be used in a fashion similar to the following
example:
float result = strtof(nptr, endptr);
if (result < 0)
{
fprintf(stderr, "%s\n", explain_strtof(nptr, endptr));
exit(EXIT_FAILURE);
}
The above code example is available pre‐packaged as the explain_strtof_or_die(3) function.
explain_errno_strtof
const char *explain_errno_strtof(int errnum, const char *nptr, char **endptr);
The explain_errno_strtof function is used to obtain an explanation of an error returned by
the strtof(3) system call. The least the message will contain is the value of
strerror(errno), but usually it will do much better, and indicate the underlying cause in
more detail.
errnum The error value to be decoded, usually obtained from the errno global variable
just before this function is called. This is necessary if you need to call any
code between the system call to be explained and this function, because many libc
functions will alter the value of errno.
nptr The original nptr, exactly as passed to the strtof(3) system call.
endptr The original endptr, exactly as passed to the strtof(3) system call.
Returns:
The message explaining the error. This message buffer is shared by all libexplain
functions which do not supply a buffer in their argument list. This will be
overwritten by the next call to any libexplain function which shares this buffer,
including other threads.
Note: This function is not thread safe, because it shares a return buffer across all
threads, and many other functions in this library.
Example: This function is intended to be used in a fashion similar to the following
example:
float result = strtof(nptr, endptr);
if (result < 0)
{
int err = errno;
fprintf(stderr, "%s\n", explain_errno_strtof(err, nptr, endptr));
exit(EXIT_FAILURE);
}
The above code example is available pre‐packaged as the explain_strtof_or_die(3) function.
explain_message_strtof
void explain_message_strtof(char *message, int message_size, const char *nptr, char
**endptr);
The explain_message_strtof function is used to obtain an explanation of an error returned
by the strtof(3) system call. The least the message will contain is the value of
strerror(errno), but usually it will do much better, and indicate the underlying cause in
more detail.
The errno global variable will be used to obtain the error value to be decoded.
message The location in which to store the returned message. If a suitable message return
buffer is supplied, this function is thread safe.
message_size
The size in bytes of the location in which to store the returned message.
nptr The original nptr, exactly as passed to the strtof(3) system call.
endptr The original endptr, exactly as passed to the strtof(3) system call.
Example: This function is intended to be used in a fashion similar to the following
example:
float result = strtof(nptr, endptr);
if (result < 0)
{
char message[3000];
explain_message_strtof(message, sizeof(message), nptr, endptr);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE);
}
The above code example is available pre‐packaged as the explain_strtof_or_die(3) function.
explain_message_errno_strtof
void explain_message_errno_strtof(char *message, int message_size, int errnum, const char
*nptr, char **endptr);
The explain_message_errno_strtof function is used to obtain an explanation of an error
returned by the strtof(3) system call. The least the message will contain is the value of
strerror(errno), but usually it will do much better, and indicate the underlying cause in
more detail.
message The location in which to store the returned message. If a suitable message return
buffer is supplied, this function is thread safe.
message_size
The size in bytes of the location in which to store the returned message.
errnum The error value to be decoded, usually obtained from the errno global variable
just before this function is called. This is necessary if you need to call any
code between the system call to be explained and this function, because many libc
functions will alter the value of errno.
nptr The original nptr, exactly as passed to the strtof(3) system call.
endptr The original endptr, exactly as passed to the strtof(3) system call.
Example: This function is intended to be used in a fashion similar to the following
example:
float result = strtof(nptr, endptr);
if (result < 0)
{
int err = errno;
char message[3000];
explain_message_errno_strtof(message, sizeof(message), err, nptr, endptr);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE);
}
The above code example is available pre‐packaged as the explain_strtof_or_die(3) function.
SEE ALSO
strtof(3)
convert ASCII string to floating‐point number
explain_strtof_or_die(3)
convert ASCII string to floating‐point number and report errors
COPYRIGHT
libexplain version 1.4
Copyright (C) 2009 Peter Miller
explain_strtof(3)