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[input] more precise utf8 matching

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nick black 2021-09-18 03:25:47 -04:00 committed by nick black
parent 00f8246bf9
commit fe34e797a3
1 changed files with 31 additions and 23 deletions
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54
src/lib/in.c
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@ -1564,16 +1564,23 @@ process_escapes(inputctx* ictx, unsigned char* buf, int* bufused){
}
}
// precondition: buflen >= 1.
// precondition: buflen >= 1. attempts to consume UTF8 input from buf. the
// expected length of a UTF8 character can be determined from its first byte.
// if we don't have that much data, return 0 and read more. if we determine
// an error, return -1 to consume 1 byte, restarting the UTF8 lex on the next
// byte. on a valid UTF8 character, set up the ncinput and return its length.
static int
process_input(const unsigned char* buf, int buflen, ncinput* ni){
assert(1 <= buflen);
memset(ni, 0, sizeof(*ni));
if(buf[0] == 0x7f){ // ASCII del, treated as backspace
ni->id = NCKEY_BACKSPACE;
return 1;
}
if(buf[0] < 0x80){ // pure ascii can't show up mid-utf8
if(buf[0] == '\n' || buf[0] == '\r'){
const int cpointlen = utf8_codepoint_length(*buf);
if(cpointlen <= 0){
logwarn("invalid UTF8 initiator on input (0x%02x)\n", *buf);
return -1;
}else if(cpointlen == 1){ // pure ascii can't show up mid-utf8-character
if(buf[0] == 0x7f){ // ASCII del, treated as backspace
ni->id = NCKEY_BACKSPACE;
}else if(buf[0] == '\n' || buf[0] == '\r'){
ni->id = NCKEY_ENTER;
}else if(buf[0] > 0 && buf[0] <= 26 && buf[0] != '\t'){
ni->id = buf[0] + 'A' - 1;
@ -1583,23 +1590,21 @@ process_input(const unsigned char* buf, int buflen, ncinput* ni){
}
return 1;
}
int cpointlen = 0;
wchar_t w;
mbstate_t mbstate;
// FIXME verify that we have enough length based off first char
while(++cpointlen <= (int)MB_CUR_MAX && cpointlen < buflen){
//fprintf(stderr, "CANDIDATE: %d cpointlen: %zu cpoint: %d\n", candidate, cpointlen, cpoint[cpointlen]);
// FIXME how the hell does this work with 16-bit wchar_t?
memset(&mbstate, 0, sizeof(mbstate));
size_t r;
if((r = mbrtowc(&w, (const char*)buf, cpointlen + 1, &mbstate)) != (size_t)-1 &&
r != (size_t)-2){
ni->id = w;
return cpointlen + 1;
}
if(cpointlen > buflen){
logwarn("utf8 character (%dB) broken across read\n", cpointlen);
return 0; // need read more data; we don't have the complete character
}
// FIXME input error stat
return 0;
wchar_t w;
mbstate_t mbstate = {};
//fprintf(stderr, "CANDIDATE: %d cpointlen: %zu cpoint: %d\n", candidate, cpointlen, cpoint[cpointlen]);
// FIXME how the hell does this work with 16-bit wchar_t?
size_t r = mbrtowc(&w, (const char*)buf, cpointlen, &mbstate);
if(r == (size_t)-1 || r == (size_t)-2){
logerror("invalid utf8 prefix (%dB) on input\n", cpointlen);
return -1;
}
ni->id = w;
return cpointlen;
}
// precondition: buflen >= 1. gets an ncinput prepared by process_input, and
@ -1622,6 +1627,9 @@ process_ncinput(inputctx* ictx, const unsigned char* buf, int buflen){
}
++ictx->ivalid;
}
}else if(r < 0){
inc_input_errors(ictx);
r = 1; // we want to consume a single byte, upstairs
}
pthread_mutex_unlock(&ictx->ilock);
pthread_cond_broadcast(&ictx->icond);