lib/charset: UTF-8 stream conversion

Provide functions to convert an UTF-8 stream to code page 437 or UTF-32.

Add unit tests.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

1 files changed, 46 insertions, 9 deletions

diff --git a/lib/charset.c b/lib/charset.c
index 946d5ee..f44c58d 100644
--- a/lib/charset.c
+++ b/lib/charset.c
@@ -481,15 +481,6 @@ uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size)
 	return dest;
 }
 
-/**
- * utf_to_cp() - translate Unicode code point to 8bit codepage
- *
- * Codepoints that do not exist in the codepage are rendered as question mark.
- *
- * @c:		pointer to Unicode code point to be translated
- * @codepage:	Unicode to codepage translation table
- * Return:	0 on success, -ENOENT if codepoint cannot be translated
- */
 int utf_to_cp(s32 *c, const u16 *codepage)
 {
 	if (*c >= 0x80) {
@@ -507,3 +498,49 @@ int utf_to_cp(s32 *c, const u16 *codepage)
 	}
 	return 0;
 }
+
+int utf8_to_cp437_stream(u8 c, char *buffer)
+{
+	char *end;
+	const char *pos;
+	s32 s;
+	int ret;
+
+	for (;;) {
+		pos = buffer;
+		end = buffer + strlen(buffer);
+		*end++ = c;
+		*end = 0;
+		s = utf8_get(&pos);
+		if (s > 0) {
+			*buffer = 0;
+			ret = utf_to_cp(&s, codepage_437);
+			return s;
+			}
+		if (pos == end)
+			return 0;
+		*buffer = 0;
+	}
+}
+
+int utf8_to_utf32_stream(u8 c, char *buffer)
+{
+	char *end;
+	const char *pos;
+	s32 s;
+
+	for (;;) {
+		pos = buffer;
+		end = buffer + strlen(buffer);
+		*end++ = c;
+		*end = 0;
+		s = utf8_get(&pos);
+		if (s > 0) {
+			*buffer = 0;
+			return s;
+		}
+		if (pos == end)
+			return 0;
+		*buffer = 0;
+	}
+}