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FreeBSD 11.0 - man page for iconvctl (freebsd section 3)

ICONVCTL(3)						   BSD Library Functions Manual 					       ICONVCTL(3)

NAME
iconvctl -- controlling and diagnostical facility for iconv(3)
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <iconv.h> int iconvctl(iconv_t cd, int request, void *argument);
DESCRIPTION
The iconvctl() function can retrieve or set specific conversion setting from the cd conversion descriptor. The request parameter specifies the operation to accomplish and argument is an operation-specific argument. The possible operations are the following: ICONV_TRIVIALP In this case argument is an int * variable, which is set to 1 if the encoding is trivial one, i.e. the input and output encodings are the same. Otherwise, the variable will be 0. ICONV_GET_TRANSLITERATE Determines if transliteration is enabled. The answer is stored in argument, which is of int *. It will be set to 1 if this feature is enabled or set to 0 otherwise. ICONV_SET_TRANSLITERATE Enables transliteration if argument, which is of int * set to 1 or disables it if argument is set to 0. ICONV_GET_DISCARD_ILSEQ Determines if illegal sequences are discarded or not. The answer is stored in argument, which is of int *. It will be set to 1 if this feature is enabled or set to 0 otherwise. ICONV_SET_DISCARD_ILSEQ Sets whether illegal sequences are discarded or not. argument, which is of int * set to 1 or disables it if argument is set to 0. ICONV_SET_HOOKS Sets callback functions, which will be called back after successful conversions. The callback functions are stored in a struct iconv_hooks variable, which is passed to iconvctl via argument by its address. ICONV_GET_ILSEQ_INVALID Determines if a character in the input buffer that is valid, but for which an identical character does not exist in the target code- set returns EILSEQ or not. The answer is stored in argument, which is of int *. It will be set to 1 if this feature is enabled or set to 0 otherwise. ICONV_SET_ILSEQ_INVALID Sets whether a character in the input buffer that is valid, but for which an identical character does not exist in the target codeset returns EILSEQ or not. If argument, which is of int * is set to 1 it will be enabled, and if argument is set to 0 it will be dis- abled.
RETURN VALUES
Upon successful completion iconvctl(), returns 0. Otherwise, -1 is returned and errno is set to specify the kind of error.
ERRORS
The iconvctl() function may cause an error in the following cases: [EINVAL] Unknown or unimplemented operation. [EBADF] The conversion descriptor specified by cd is invalid.
SEE ALSO
iconv(1), iconv(3)
STANDARDS
The iconvctl facility is a non-standard extension, which appeared in the GNU implementation and was adopted in FreeBSD 9.0 for compatibil- ity's sake.
AUTHORS
This manual page was written by Gabor Kovesdan <gabor@FreeBSD.org>.
BUGS
Transliteration is enabled in this implementation by default, so it is impossible by design to turn it off. Accordingly, trying to turn it off will always fail and -1 will be returned. Getting the transliteration state will always succeed and indicate that it is turned on, though.
BSD
November 25, 2009 BSD

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