Mercurial > MadButterfly
diff src/shape_stext.c @ 415:fef1b8076041
Make compute_utf8_chars_sz to compute length of n UTF 8 characters correctly.
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Sun, 26 Jul 2009 15:31:40 +0800 |
| parents | bbf036c315be |
| children | abc420282c70 |
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--- a/src/shape_stext.c Sun Jul 26 15:31:40 2009 +0800 +++ b/src/shape_stext.c Sun Jul 26 15:31:40 2009 +0800 @@ -305,16 +305,26 @@ int compute_utf8_chars_sz(const char *txt, int n_chars) { int i; const char *p = txt; + const char *v; for(i = 0; i < n_chars && *p; i++) { - if(*p++ & 0x80) - continue; /* single byte */ - /* multi-bytes */ - while(*p && ((*p & 0xc0) == 0x80)) + if(!(*p & 0x80)) /* single byte */ p++; + else if((*p & 0xe0) == 0xc0) /* 2 bytes */ + p += 2; + else if((*p & 0xf0) == 0xe0) /* 3 bytes */ + p += 3; + else if((*p & 0xf8) == 0xf0) /* 4 bytes */ + p += 4; + else + return ERR; } if(i < n_chars) return ERR; + + for(v = txt; v != p; v++) + if(*v == '\x0') + return ERR; return p - txt; } @@ -581,6 +591,18 @@ CU_ASSERT(MBE_GET_Y_ADV(&ext1) == -8); } +static +void test_compute_utf8_chars_sz(void) { + const char *str = "\xe4\xb8\xad\xe6\x96\x87test\xe6\xb8\xac\xe8\xa9\xa6"; + int sz; + + sz = compute_utf8_chars_sz(str, 4); + CU_ASSERT(sz == 8); + + sz = compute_utf8_chars_sz(str, 9); + CU_ASSERT(sz == ERR); +} + #include <CUnit/Basic.h> CU_pSuite get_stext_suite(void) { CU_pSuite suite; @@ -590,6 +612,7 @@ CU_ADD_TEST(suite, test_make_scaled_font_face_matrix); CU_ADD_TEST(suite, test_compute_text_extents); CU_ADD_TEST(suite, test_extent_extents); + CU_ADD_TEST(suite, test_compute_utf8_chars_sz); return suite; }