Provided by: libexplain-dev_1.4.D001-12_amd64 
NAME
explain_iconv_open - explain iconv_open(3) errors
SYNOPSIS
#include <libexplain/iconv_open.h>
const char *explain_iconv_open(const char *tocode, const char *fromcode);
const char *explain_errno_iconv_open(int errnum, const char *tocode, const char
*fromcode);
void explain_message_iconv_open(char *message, int message_size, const char *tocode, const
char *fromcode);
void explain_message_errno_iconv_open(char *message, int message_size, int errnum, const
char *tocode, const char *fromcode);
DESCRIPTION
These functions may be used to obtain explanations for errors returned by the
iconv_open(3) system call.
explain_iconv_open
const char *explain_iconv_open(const char *tocode, const char *fromcode);
The explain_iconv_open function is used to obtain an explanation of an error returned by
the iconv_open(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.
tocode The original tocode, exactly as passed to the iconv_open(3) system call.
fromcode
The original fromcode, exactly as passed to the iconv_open(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:
iconv_t result = iconv_open(tocode, fromcode);
if (result < 0)
{
fprintf(stderr, "%s\n", explain_iconv_open(tocode, fromcode));
exit(EXIT_FAILURE);
}
The above code example is available pre-packaged as the explain_iconv_open_or_die(3)
function.
explain_errno_iconv_open
const char *explain_errno_iconv_open(int errnum, const char *tocode, const char
*fromcode);
The explain_errno_iconv_open function is used to obtain an explanation of an error
returned by the iconv_open(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.
tocode The original tocode, exactly as passed to the iconv_open(3) system call.
fromcode
The original fromcode, exactly as passed to the iconv_open(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:
iconv_t result = iconv_open(tocode, fromcode);
if (result < 0)
{
int err = errno;
fprintf(stderr, "%s\n", explain_errno_iconv_open(err, tocode, fromcode));
exit(EXIT_FAILURE);
}
The above code example is available pre-packaged as the explain_iconv_open_or_die(3)
function.
explain_message_iconv_open
void explain_message_iconv_open(char *message, int message_size, const char *tocode, const
char *fromcode);
The explain_message_iconv_open function is used to obtain an explanation of an error
returned by the iconv_open(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.
tocode The original tocode, exactly as passed to the iconv_open(3) system call.
fromcode
The original fromcode, exactly as passed to the iconv_open(3) system call.
Example: This function is intended to be used in a fashion similar to the following
example:
iconv_t result = iconv_open(tocode, fromcode);
if (result < 0)
{
char message[3000];
explain_message_iconv_open(message, sizeof(message), tocode, fromcode);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE);
}
The above code example is available pre-packaged as the explain_iconv_open_or_die(3)
function.
explain_message_errno_iconv_open
void explain_message_errno_iconv_open(char *message, int message_size, int errnum, const
char *tocode, const char *fromcode);
The explain_message_errno_iconv_open function is used to obtain an explanation of an error
returned by the iconv_open(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.
tocode The original tocode, exactly as passed to the iconv_open(3) system call.
fromcode
The original fromcode, exactly as passed to the iconv_open(3) system call.
Example: This function is intended to be used in a fashion similar to the following
example:
iconv_t result = iconv_open(tocode, fromcode);
if (result < 0)
{
int err = errno;
char message[3000];
explain_message_errno_iconv_open(message, sizeof(message), err, tocode,
fromcode);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE);
}
The above code example is available pre-packaged as the explain_iconv_open_or_die(3)
function.
SEE ALSO
iconv_open(3)
allocate descriptor for character set conversion
explain_iconv_open_or_die(3)
allocate descriptor for character set conversion and report errors
COPYRIGHT
libexplain version 1.4
Copyright (C) 2013 Peter Miller
explain_iconv_open(3)