[...] I traced the code again and again but nothing special happened. You called string_convert and pass 0 as the length of the string, so in string_convert_ext you calculates the length of the string with STRLEN, then call iconv_string, last iconv. There is nothing wrong with the length anywhere. So... Maybe it is still iconv's fault.
Sorry all. I did more tests and searched more documents and found that it was a bug of libiconv, not gvim. The problem occurs only when converting gb2312 to gbk. I'm trying to debug libiconv...
[...]
Ashamed Edward L. Fox
