iconv

ICONV(3)                   Linux Programmer's Manual                  ICONV(3)



NAME
       iconv - perform character set conversion

SYNOPSIS
       #include <iconv.h>

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

DESCRIPTION
       The argument cd must be a conversion descriptor created using the
       function iconv_open.

       The main case is when inbuf is not NULL and *inbuf is not NULL.  In
       this case, the iconv function converts the multibyte sequence starting
       at *inbuf to a multibyte sequence starting at *outbuf.  At most
       *inbytesleft bytes, starting at *inbuf, will be read.  At most
       *outbytesleft bytes, starting at *outbuf, will be written.

       The iconv function converts one multibyte character at a time, and for
       each character conversion it increments *inbuf and decrements
       *inbytesleft by the number of converted input bytes, it increments
       *outbuf and decrements *outbytesptr by the number of converted output
       bytes, and it updates the conversion state contained in cd.  The
       conversion can stop for four reasons:

       1. An invalid multibyte sequence is encountered in the input. In this
       case it sets errno to EILSEQ and returns (size_t)(-1). *inbuf is left
       pointing to the beginning of the invalid multibyte sequence.

       2. The input byte sequence has been entirely converted, i.e.
       *inbytesleft has gone down to 0. In this case iconv returns the number
       of non-reversible conversions performed during this call.

       3. An incomplete multibyte sequence is encountered in the input, and
       the input byte sequence terminates after it. In this case it sets errno
       to EINVAL and returns (size_t)(-1). *inbuf is left pointing to the
       beginning of the incomplete multibyte sequence.

       4. The output buffer has no more room for the next converted character.
       In this case it sets errno to E2BIG and returns (size_t)(-1).

       A different case is when inbuf is NULL or *inbuf is NULL, but outbuf is
       not NULL and *outbuf is not NULL. In this case, the iconv function
       attempts to set cd's conversion state to the initial state and store a
       corresponding shift sequence at *outbuf.  At most *outbytesleft bytes,
       starting at *outbuf, will be written.  If the output buffer has no more
       room for this reset sequence, it sets errno to E2BIG and returns
       (size_t)(-1). Otherwise it increments *outbuf and decrements
       *outbytesptr by the number of bytes written.

       A third case is when inbuf is NULL or *inbuf is NULL, and outbuf is
       NULL or *outbuf is NULL. In this case, the iconv function sets cd's
       conversion state to the initial state.

RETURN VALUE
       The iconv function returns the number of characters converted in a non-
       reversible way during this call; reversible conversions are not
       counted.  In case of error, it sets errno and returns (iconv_t)(-1).

ERRORS
       The following errors can occur, among others:

       E2BIG  There is not sufficient room at *outbuf.

       EILSEQ An invalid multibyte sequence has been encountered in the input.

       EINVAL An incomplete multibyte sequence has been encountered in the
              input.

CONFORMING TO
       UNIX98

SEE ALSO
       iconv_open(3), iconv_close(3)



GNU                            November 18, 2000                      ICONV(3)