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iconv(3) [opendarwin man page]

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 *out- bytesleft 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 *outbytesleft 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 *outbytesleft 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
June 13, 2002 ICONV(3)

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

NAME
iconv - perform character set conversion SYNOPSIS
#include <iconv.h> size_t iconv(iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft); DESCRIPTION
The iconv() function converts a sequence of characters in one character encoding to a sequence of characters in another character encoding. The cd argument is a conversion descriptor, previously created by a call to iconv_open(3); the conversion descriptor defines the character encodings that iconv() uses for the conversion. The inbuf argument is the address of a variable that points to the first character of the input sequence; inbytesleft indicates the number of bytes in that buffer. The outbuf argument is the address of a variable that points to the first byte available in the output buffer; outbytesleft indicates the number of bytes available in the output buffer. The main case is when inbuf is not NULL and *inbuf is not NULL. In this case, the iconv() function converts the multibyte sequence start- ing at *inbuf to a multibyte sequence starting at *outbuf. At most *inbytesleft bytes, starting at *inbuf, will be read. At most *out- bytesleft 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 *outbytesleft by the number of converted output bytes, and it updates the conversion state contained in cd. If the character encoding of the input is stateful, the iconv() function can also convert a sequence of input bytes to an update to the conversion state without producing any output bytes; such input is called a shift sequence. 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, that is, *inbytesleft has gone down to 0. In this case iconv() returns the number of nonreversible 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() func- tion 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 *outbytesleft 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 nonreversible way during this call; reversible conversions are not counted. In case of error, it sets errno and returns (size_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. VERSIONS
This function is available in glibc since version 2.1. CONFORMING TO
POSIX.1-2001. NOTES
Although inbuf and outbuf are typed as char **, this does not mean that the objects they point can be interpreted as C strings or as arrays of characters: the interpretation of character byte sequences is handled internally by the conversion functions. In some encodings, a zero byte may be a valid part of a multibyte character. The caller of iconv() must ensure that the pointers passed to the function are suitable for accessing characters in the appropriate charac- ter set. This includes ensuring correct alignment on platforms that have tight restrictions on alignment. SEE ALSO
iconv_close(3), iconv_open(3) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2012-05-10 ICONV(3)
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