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6.7 Error Handling

idna_strerror

Function: const char * idna_strerror (Idna_rc rc)

rc: an Idna_rc return code.

Convert a return code integer to a text string. This string can be used to output a diagnostic message to the user.

IDNA_SUCCESS: Successful operation. This value is guaranteed to always be zero, the remaining ones are only guaranteed to hold non-zero values, for logical comparison purposes.

IDNA_STRINGPREP_ERROR: Error during string preparation.

IDNA_PUNYCODE_ERROR: Error during punycode operation.

IDNA_CONTAINS_NON_LDH: For IDNA_USE_STD3_ASCII_RULES, indicate that the string contains non-LDH ASCII characters.

IDNA_CONTAINS_MINUS: For IDNA_USE_STD3_ASCII_RULES, indicate that the string contains a leading or trailing hyphen-minus (U+002D).

IDNA_INVALID_LENGTH: The final output string is not within the (inclusive) range 1 to 63 characters.

IDNA_NO_ACE_PREFIX: The string does not contain the ACE prefix (for ToUnicode).

IDNA_ROUNDTRIP_VERIFY_ERROR: The ToASCII operation on output string does not equal the input.

IDNA_CONTAINS_ACE_PREFIX: The input contains the ACE prefix (for ToASCII).

IDNA_ICONV_ERROR: Could not convert string in locale encoding.

IDNA_MALLOC_ERROR: Could not allocate buffer (this is typically a fatal error).

IDNA_DLOPEN_ERROR: Could not dlopen the libcidn DSO (only used internally in libc).

Return value: Returns a pointer to a statically allocated string containing a description of the error with the return code rc.


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