lib-charset: Run iconv unit tests by giving iconv() new data 1 byte at a time.

diff --git a/src/lib-charset/test-charset.c b/src/lib-charset/test-charset.c
index ce91a612804c980ebbf725a2b909eef2df0a2a3b..2a154f148c1a2a8db9172537105b904ee6aaedb8 100644 (file)
--- a/src/lib-charset/test-charset.c
+++ b/src/lib-charset/test-charset.c
@@ -69,7 +69,9 @@ static void test_charset_iconv(void)
                { "ISO-8859-1", "p\xE4\xE4", "pää", CHARSET_RET_OK }
        };
        string_t *str = t_str_new(128);
+       struct charset_translation *trans;
        enum charset_result result;
+       size_t pos, left, limit, len;
        unsigned int i;
 
        test_begin("charset iconv");
@@ -79,6 +81,21 @@ static void test_charset_iconv(void)
                                                    tests[i].input, str, &result) == 0, i);
                test_assert_idx(strcmp(tests[i].output, str_c(str)) == 0, i);
                test_assert_idx(result == tests[i].result, i);
+
+               str_truncate(str, 0);
+               test_assert_idx(charset_to_utf8_begin(tests[i].charset, NULL, &trans) == 0, i);
+               len = strlen(tests[i].input);
+               for (pos = 0, limit = 1; limit <= len; pos += left, limit++) {
+                       left = limit - pos;
+                       result = charset_to_utf8(trans, (const void *)(tests[i].input + pos),
+                                                &left, str);
+                       if (result != CHARSET_RET_INCOMPLETE_INPUT &&
+                           result != CHARSET_RET_OK)
+                               break;
+               }
+               test_assert_idx(strcmp(tests[i].output, str_c(str)) == 0, i);
+               test_assert_idx(result == tests[i].result, i);
+               charset_to_utf8_end(&trans);
        }
        /* Use //IGNORE just to force handling to be done by iconv
           instead of our own UTF-8 routines. */