libexplain/iconv.c File Reference

#include <libexplain/ac/errno.h>
#include <libexplain/ac/iconv.h>
#include <libexplain/buffer/errno/iconv.h>
#include <libexplain/common_message_buffer.h>
#include <libexplain/iconv.h>

Go to the source code of this file.

Functions
const char *	explain_iconv (iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
const char *	explain_errno_iconv (int errnum, iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
void	explain_message_iconv (char *message, int message_size, iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
void	explain_message_errno_iconv (char *message, int message_size, int errnum, iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft)

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Function Documentation

const char* explain_errno_iconv	(	int	errnum,
		iconv_t	cd,
		char **	inbuf,
		size_t *	inbytesleft,
		char **	outbuf,
		size_t *	outbytesleft
	)

The explain_errno_iconv function is used to obtain an explanation of an error returned by the iconv(3) system call. The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail.

Parameters:

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.
cd	The original cd, exactly as passed to the iconv(3) system call.
inbuf	The original inbuf, exactly as passed to the iconv(3) system call.
inbytesleft	The original inbytesleft, exactly as passed to the iconv(3) system call.
outbuf	The original outbuf, exactly as passed to the iconv(3) system call.
outbytesleft	The original outbytesleft, exactly as passed to the iconv(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:

 errno = 0;
 size_t result = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
 if (result < 0 && errno != 0)
 {
     int err = errno;
     fprintf(stderr, "%s\n", explain_errno_iconv(err, cd, inbuf, inbytesleft,
         outbuf, outbytesleft));
     exit(EXIT_FAILURE);
 }

The above code example is available pre-packaged as the explain_iconv_or_die function.

Definition at line 37 of file iconv.c.

const char* explain_iconv	(	iconv_t	cd,
		char **	inbuf,
		size_t *	inbytesleft,
		char **	outbuf,
		size_t *	outbytesleft
	)

The explain_iconv function is used to obtain an explanation of an error returned by the iconv(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.

Parameters:

cd	The original cd, exactly as passed to the iconv(3) system call.
inbuf	The original inbuf, exactly as passed to the iconv(3) system call.
inbytesleft	The original inbytesleft, exactly as passed to the iconv(3) system call.
outbuf	The original outbuf, exactly as passed to the iconv(3) system call.
outbytesleft	The original outbytesleft, exactly as passed to the iconv(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:

 errno = 0;
 size_t result = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
 if (result < 0 && errno != 0)
 {
     explain_output_error_and_die("%s\n", explain_iconv(cd, inbuf,
         inbytesleft, outbuf, outbytesleft));
 }

The above code example is available pre\-packaged as the explain_iconv_or_die function.

Definition at line 28 of file iconv.c.

void explain_message_errno_iconv	(	char *	message,
		int	message_size,
		int	errnum,
		iconv_t	cd,
		char **	inbuf,
		size_t *	inbytesleft,
		char **	outbuf,
		size_t *	outbytesleft
	)

The explain_message_errno_iconv function is used to obtain an explanation of an error returned by the iconv(3) system call. The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail.

Parameters:

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.
cd	The original cd, exactly as passed to the iconv(3) system call.
inbuf	The original inbuf, exactly as passed to the iconv(3) system call.
inbytesleft	The original inbytesleft, exactly as passed to the iconv(3) system call.
outbuf	The original outbuf, exactly as passed to the iconv(3) system call.
outbytesleft	The original outbytesleft, exactly as passed to the iconv(3) system call.

Example:

This function is intended to be used in a fashion similar to the following example:

 errno = 0;
 size_t result = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
 if (result < 0 && errno != 0)
 {
     int err = errno;
     char message[3000];
     explain_message_errno_iconv(message, sizeof(message), err, cd, inbuf,
         inbytesleft, outbuf, outbytesleft);
     fprintf(stderr, "%s\n", message);
     exit(EXIT_FAILURE);
 }

The above code example is available pre-packaged as the explain_iconv_or_die function.

Definition at line 57 of file iconv.c.

void explain_message_iconv	(	char *	message,
		int	message_size,
		iconv_t	cd,
		char **	inbuf,
		size_t *	inbytesleft,
		char **	outbuf,
		size_t *	outbytesleft
	)

The explain_message_iconv function is used to obtain an explanation of an error returned by the iconv(3) system call. The least the message will contain is the value of strerror(errnum), 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.

Parameters:

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.
cd	The original cd, exactly as passed to the iconv(3) system call.
inbuf	The original inbuf, exactly as passed to the iconv(3) system call.
inbytesleft	The original inbytesleft, exactly as passed to the iconv(3) system call.
outbuf	The original outbuf, exactly as passed to the iconv(3) system call.
outbytesleft	The original outbytesleft, exactly as passed to the iconv(3) system call.

Example:

This function is intended to be used in a fashion similar to the following example:

 errno = 0;
 size_t result = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
 if (result < 0 && errno != 0)
 {
     char message[3000];
     explain_message_iconv(message, sizeof(message), cd, inbuf, inbytesleft,
         outbuf, outbytesleft);
     fprintf(stderr, "%s\n", message);
     exit(EXIT_FAILURE);
 }

The above code example is available pre-packaged as the explain_iconv_or_die function.

Definition at line 48 of file iconv.c.