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 char-
acter encoding tocode.
The values permitted for fromcode and tocode and the supported combina-
tions are system-dependent. For the GNU C library, the permitted val-
ues are listed by the iconv --list command, and all combinations of the
listed values are supported. Furthermore the GNU C library and the GNU
libiconv library support the following two suffixes:
When the string "//TRANSLIT" is appended to tocode, translitera-
tion is activated. This means that when a character cannot be
represented in the target character set, it can be approximated
through one or several similarly looking characters.
When the string "//IGNORE" is appended to tocode, characters
that cannot be represented in the target character set will be
The resulting conversion descriptor can be used with iconv(3) any num-
ber of times. It remains valid until deallocated using iconv_close(3).
A conversion descriptor contains a conversion state. After creation
using iconv_open(), the state is in the initial state. Using iconv(3)
modifies the descriptor's conversion state. (This implies that a con-
version descriptor can not be used in multiple threads simultaneously.)
To bring the state back to the initial state, use iconv(3) with NULL as
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
This function is available in glibc since version 2.1.
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