kiconv(9F) Kernel Functions for Drivers kiconv(9F)NAMEkiconv - buffer-based code conversion function
SYNOPSIS
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/sunddi.h>
size_t kiconv(kiconv_t cd, char **inbuf, size_t *inbytesleft,
char **outbuf, size_t *outbytesleft, int *errno);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
PARAMETERS
The parameters for the kiconv function are as follows:
cd Code conversion descriptor indicating the code conver‐
sion and conversion state.
inbuf Points to an address of a buffer containing a sequence
of character bytes in fromcode codeset to be converted.
After the conversion, the variable is updated to point
to the byte following the last byte that was success‐
fully used in the conversion.
inbytesleft As an input parameter, the number of bytes to be con‐
verted in inbuf. As an output parameter, the number of
bytes in inbuf still not converted after the conver‐
sion.
outbuf Points to an address of a buffer where converted char‐
acter bytes in tocode codeset can be saved. After the
conversion, the variable is updated to point to the
byte following the last byte of converted output data.
outbytesleft As an input parameter, the number of available bytes at
outbuf where converted character bytes can be saved. As
an output parameter, the number of bytes still avail‐
able at outbuf after the conversion.
errno Indicates the error when conversion is not completed or
failed. The following are possible values:
EILSEQ The input conversion was stopped due to an
input byte that does not belong to the
input codeset.
E2BIG The input conversion was stopped due to
lack of space in the output buffer.
EINVAL The input conversion was stopped due to an
incomplete character or shift sequence at
the end of the input buffer.
EBADF The cd input parameter is not a valid open
code conversion descriptor.
DESCRIPTION
The kiconv() function converts the sequence of characters from one
codeset, in the array specified by inbuf, into a sequence of corre‐
sponding characters in another codeset, in the array specified by out‐
buf. The codesets are those specified in the kiconv_open() call that
returned the code conversion descriptor, cd. The inbuf parameter points
to a variable that points to the first character in the input buffer
and inbytesleft indicates the number of bytes to the end of the buffer
to be converted. The outbuf parameter points to a variable that points
to the first available byte in the output buffer and outbytesleft indi‐
cates the number of the available bytes to the end of the buffer.
For state-dependent encodings, the conversion descriptor cd is placed
into its initial shift state by a call for which inbuf is a null
pointer, or for which inbuf points to a null pointer. When kiconv() is
called in this way, and if outbuf is not a null pointer or a pointer to
a null pointer, and outbytesleft points to a positive value, kiconv()
places, if any, into the output buffer, the byte sequence to change the
output buffer to its initial shift state. If the output buffer is not
large enough to hold the entire reset sequence, kiconv() fails and sets
errno to E2BIG. Subsequent calls with inbuf as other than a null
pointer or a pointer to a null pointer cause the conversion to take
place from the current state of the conversion descriptor.
If a sequence of input bytes does not form a valid character in the
specified codeset, conversion stops after the previous successfully
converted character. If the input buffer ends with an incomplete char‐
acter or shift sequence, conversion stops after the previous success‐
fully converted bytes. If the output buffer is not large enough to hold
the entire converted input, conversion stops just prior to the input
bytes that would cause the output buffer to overflow. The variable
pointed to by inbuf is updated to point to the byte following the last
byte that was successfully used in the conversion. The value pointed to
by inbytesleft is decremented to reflect the number of bytes still not
converted in the input buffer. The variable pointed to by outbuf is
updated to point to the byte following the last byte of converted out‐
put data. The value pointed to by outbytesleft is decremented to
reflect the number of bytes still available in the output buffer. For
state-dependent encodings, the conversion descriptor is updated to
reflect the shift state in effect at the end of the last successfully
converted byte sequence.
If kiconv() encounters a character in the input buffer that is legal,
but for which an identical character does not exist in the target code‐
set, kiconv() performs an implementation-defined conversion (that is, a
non-identical conversion) on this character.
RETURN VALUES
The kiconv() function updates the variables pointed to by the parame‐
ters to reflect the extent of the conversion and returns the number of
non-identical conversions performed. If the entire string in the input
buffer is converted, the value pointed to by inbytesleft is 0. If the
input conversion is stopped due to any conditions mentioned above, the
value pointed to by inbytesleft is non-zero and errno is set to indi‐
cate the condition. If such and other error occurs, kiconv() returns
(size_t)-1 and sets errno to indicate the error.
CONTEXTkiconv() can be called from user or interrupt context.
EXAMPLES
Example 1 Performing a Simple Conversion
The following example shows how to perform a simple conversion using
kiconv() with a limited size of output buffer:
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/sunddi.h>
int
doconversion(char *fromcode, char *tocode, char *inbuf, char *outbuf,
size_t inlen, size_t *outlen)
{
kiconv_t cd;
size_t ileft, ret;
int err;
cd = kiconv_open((const char *)tocode, (const char *)fromcode);
if (cd == (kiconv_t)-1) {
/* Cannot open conversion. */
return (-1);
}
ret = kiconv(cd, &inbuf, &inlen, &outbuf, outlen, &err);
if (ret == (size_t)-1)
goto doconv_error_return;
/*
* Reset the conversion descriptor. This will also
* make sure to write to output buffer any saved bytes
* in the conversion descriptor state.
*/
ileft = 0;
ret = kiconv(cd, (char *)NULL, &ileft, &outbuf, outlen, &err);
if (ret == (size_t)-1)
goto doconv_error_return;
(void) kiconv_close(cd);
return (0);
doconv_error_return:
(void) kiconv_close(cd);
/* Need more output buffer. */
if (err == E2BIG)
return (-2);
/* Illegal sequence? */
if (err == EILSEQ)
return (-3);
/* Incomplete character? */
if (err == EINVAL)
return (-4);
/*
* Bad code conversion descriptor or any other unknown error.
*/
return (-5);
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOiconv(3C), iconv_close(3C), iconv_open(3C), u8_strcmp(3C),
u8_textprep_str(3C), u8_validate(3C), uconv_u16tou32(3C),
uconv_u16tou8(3C), uconv_u32tou16(3C), uconv_u32tou8(3C),
uconv_u8tou16(3C), uconv_u8tou32(3C), attributes(5), kiconvstr(9F),
kiconv_close(9F), kiconv_open(9F), u8_strcmp(9F), u8_textprep_str(9F),
u8_validate(9F), uconv_u16tou32(9F), uconv_u16tou8(9F),
uconv_u32tou16(9F), uconv_u32tou8(9F), uconv_u8tou16(9F),
uconv_u8tou32(9F)
The Unicode Standard:
http://www.unicode.org/standard/standard.html
NOTES
The iconv(3C) man page also has a good example code that can be refer‐
enced.
SunOS 5.11 16 Oct 2007 kiconv(9F)
