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iconv_open - allocate descriptor for character set conversion
iconv_t iconv_open (const char* tocode, const char* fromcode);
The iconv_open function allocates a conversion descriptor suitable for
converting byte sequences from character encoding fromcode to character
The values permitted for fromcode and tocode and the supported
combinations are system dependent. For the GNU C library, the permitted
values are listed by the iconv --list command, and all combinations of
the listed values are supported.
The resulting conversion descriptor can be used with iconv any number
of times. It remains valid until deallocated using iconv_close.
A conversion descriptor contains a conversion state. After creation
using iconv_open, the state is in the initial state. Using iconv
modifies the descriptor’s conversion state. (This implies that a
conversion descriptor can not be used in multiple threads
simultaneously.) To bring the state back to the initial state, use
iconv with NULL as inbuf argument.
The iconv_open function returns a freshly allocated conversion
descriptor. In case of error, it sets errno and returns (iconv_t)(-1).
The following error can occur, among others:
EINVAL The conversion from fromcode to tocode is not supported by the
iconv(3), iconv_close(3), iconv(1)