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Extract UTF-8 sequence parser into its own function, fix bugs, apply unit tests

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This commit is contained in:
Paul LeoNerd Evans 2011-03-31 23:42:52 +01:00
parent 739be0e55d
commit f1b3dff4c2
2 changed files with 169 additions and 69 deletions
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93
t/03utf8.c
View File

@ -7,7 +7,7 @@ int main(int argc, char *argv[])
TermKey *tk;
TermKeyKey key;
plan_tests(21);
plan_tests(57);
pipe(fd);
@ -72,6 +72,97 @@ int main(int argc, char *argv[])
is_int(key.type, TERMKEY_TYPE_UNICODE, "key.type UTF-8 4 high");
is_int(key.code.number, 0x10FFFF, "key.code.number UTF-8 4 high");
/* Invalid continuations */
write(fd[1], "\xC2!", 2);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 2 invalid cont");
is_int(key.code.number, 0xFFFD, "key.code.number UTF-8 2 invalid cont");
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 2 invalid after");
is_int(key.code.number, '!', "key.code.number UTF-8 2 invalid after");
write(fd[1], "\xE0!", 2);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 3 invalid cont");
is_int(key.code.number, 0xFFFD, "key.code.number UTF-8 3 invalid cont");
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 3 invalid after");
is_int(key.code.number, '!', "key.code.number UTF-8 3 invalid after");
write(fd[1], "\xE0\xA0!", 3);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 3 invalid cont 2");
is_int(key.code.number, 0xFFFD, "key.code.number UTF-8 3 invalid cont 2");
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 3 invalid after");
is_int(key.code.number, '!', "key.code.number UTF-8 3 invalid after");
write(fd[1], "\xF0!", 2);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 4 invalid cont");
is_int(key.code.number, 0xFFFD, "key.code.number UTF-8 4 invalid cont");
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 4 invalid after");
is_int(key.code.number, '!', "key.code.number UTF-8 4 invalid after");
write(fd[1], "\xF0\x90!", 3);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 4 invalid cont 2");
is_int(key.code.number, 0xFFFD, "key.code.number UTF-8 4 invalid cont 2");
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 4 invalid after");
is_int(key.code.number, '!', "key.code.number UTF-8 4 invalid after");
write(fd[1], "\xF0\x90\x80!", 4);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 4 invalid cont 3");
is_int(key.code.number, 0xFFFD, "key.code.number UTF-8 4 invalid cont 3");
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 4 invalid after");
is_int(key.code.number, '!', "key.code.number UTF-8 4 invalid after");
/* Partials */
write(fd[1], "\xC2", 1);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_AGAIN, "getkey yields RES_AGAIN UTF-8 2 partial");
write(fd[1], "\xA0", 1);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 2 partial");
is_int(key.code.number, 0x00A0, "key.code.number UTF-8 2 partial");
write(fd[1], "\xE0", 1);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_AGAIN, "getkey yields RES_AGAIN UTF-8 3 partial");
write(fd[1], "\xA0", 1);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_AGAIN, "getkey yields RES_AGAIN UTF-8 3 partial");
write(fd[1], "\x80", 1);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 3 partial");
is_int(key.code.number, 0x0800, "key.code.number UTF-8 3 partial");
write(fd[1], "\xF0", 1);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_AGAIN, "getkey yields RES_AGAIN UTF-8 4 partial");
write(fd[1], "\x90", 1);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_AGAIN, "getkey yields RES_AGAIN UTF-8 4 partial");
write(fd[1], "\x80", 1);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_AGAIN, "getkey yields RES_AGAIN UTF-8 4 partial");
write(fd[1], "\x80", 1);
termkey_advisereadable(tk);
is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY UTF-8 4 partial");
is_int(key.code.number, 0x10000, "key.code.number UTF-8 4 partial");
termkey_destroy(tk);
return exit_status();

145
termkey.c
View File

@ -422,6 +422,76 @@ static void fill_utf8(TermKeyKey *key)
}
}
#define UTF8_INVALID 0xFFFD
static TermKeyResult parse_utf8(const unsigned char *bytes, size_t len, long *cp, size_t *nbytep)
{
unsigned int nbytes;
unsigned char b0 = bytes[0];
if(b0 < 0xc0) {
// Starts with a continuation byte - that's not right
*cp = UTF8_INVALID;
*nbytep = 1;
return TERMKEY_RES_KEY;
}
else if(b0 < 0xe0) {
nbytes = 2;
*cp = b0 & 0x1f;
}
else if(b0 < 0xf0) {
nbytes = 3;
*cp = b0 & 0x0f;
}
else if(b0 < 0xf8) {
nbytes = 4;
*cp = b0 & 0x07;
}
else if(b0 < 0xfc) {
nbytes = 5;
*cp = b0 & 0x03;
}
else if(b0 < 0xfe) {
nbytes = 6;
*cp = b0 & 0x01;
}
else {
*cp = UTF8_INVALID;
*nbytep = 1;
return TERMKEY_RES_KEY;
}
for(unsigned int b = 1; b < nbytes; b++) {
unsigned char cb;
if(b >= len)
return TERMKEY_RES_AGAIN;
cb = bytes[b];
if(cb < 0x80 || cb >= 0xc0) {
*cp = UTF8_INVALID;
*nbytep = b;
return TERMKEY_RES_KEY;
}
*cp <<= 6;
*cp |= cb & 0x3f;
}
// Check for overlong sequences
if(nbytes > utf8_seqlen(*cp))
*cp = UTF8_INVALID;
// Check for UTF-16 surrogates or invalid *cps
if((*cp >= 0xD800 && *cp <= 0xDFFF) ||
*cp == 0xFFFE ||
*cp == 0xFFFF)
*cp = UTF8_INVALID;
*nbytep = nbytes;
return TERMKEY_RES_KEY;
}
static void emit_codepoint(TermKey *tk, long codepoint, TermKeyKey *key)
{
if(codepoint < 0x20) {
@ -487,8 +557,6 @@ static void emit_codepoint(TermKey *tk, long codepoint, TermKeyKey *key)
fill_utf8(key);
}
#define UTF8_INVALID 0xFFFD
static TermKeyResult peekkey(TermKey *tk, TermKeyKey *key, int force, size_t *nbytep)
{
int again = 0;
@ -604,83 +672,24 @@ static TermKeyResult peekkey_simple(TermKey *tk, TermKeyKey *key, int force, siz
}
else if(tk->flags & TERMKEY_FLAG_UTF8) {
// Some UTF-8
unsigned int nbytes;
long codepoint;
TermKeyResult res = parse_utf8(tk->buffer + tk->buffstart, tk->buffcount, &codepoint, nbytep);
key->type = TERMKEY_TYPE_UNICODE;
key->modifiers = 0;
if(b0 < 0xc0) {
// Starts with a continuation byte - that's not right
(*tk->method.emit_codepoint)(tk, UTF8_INVALID, key);
*nbytep = 1;
return TERMKEY_RES_KEY;
}
else if(b0 < 0xe0) {
nbytes = 2;
codepoint = b0 & 0x1f;
}
else if(b0 < 0xf0) {
nbytes = 3;
codepoint = b0 & 0x0f;
}
else if(b0 < 0xf8) {
nbytes = 4;
codepoint = b0 & 0x07;
}
else if(b0 < 0xfc) {
nbytes = 5;
codepoint = b0 & 0x03;
}
else if(b0 < 0xfe) {
nbytes = 6;
codepoint = b0 & 0x01;
}
else {
(*tk->method.emit_codepoint)(tk, UTF8_INVALID, key);
*nbytep = 1;
return TERMKEY_RES_KEY;
}
if(tk->buffcount < nbytes) {
if(!force)
return TERMKEY_RES_AGAIN;
if(res == TERMKEY_RES_AGAIN && force) {
/* There weren't enough bytes for a complete UTF-8 sequence but caller
* demands an answer. About the best thing we can do here is eat as many
* bytes as we have, and emit a UTF8_INVALID. If the remaining bytes
* arrive later, they'll be invalid too.
*/
(*tk->method.emit_codepoint)(tk, UTF8_INVALID, key);
codepoint = UTF8_INVALID;
*nbytep = tk->buffcount;
return TERMKEY_RES_KEY;
res = TERMKEY_RES_KEY;
}
for(unsigned int b = 1; b < nbytes; b++) {
unsigned char cb = CHARAT(b);
if(cb < 0x80 || cb >= 0xc0) {
(*tk->method.emit_codepoint)(tk, UTF8_INVALID, key);
*nbytep = b - 1;
return TERMKEY_RES_KEY;
}
codepoint <<= 6;
codepoint |= cb & 0x3f;
}
// Check for overlong sequences
if(nbytes > utf8_seqlen(codepoint))
codepoint = UTF8_INVALID;
// Check for UTF-16 surrogates or invalid codepoints
if((codepoint >= 0xD800 && codepoint <= 0xDFFF) ||
codepoint == 0xFFFE ||
codepoint == 0xFFFF)
codepoint = UTF8_INVALID;
key->type = TERMKEY_TYPE_UNICODE;
key->modifiers = 0;
(*tk->method.emit_codepoint)(tk, codepoint, key);
*nbytep = nbytes;
return TERMKEY_RES_KEY;
return res;
}
else {
// Non UTF-8 case - just report the raw byte