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Shell: add bareboness utf8 support 

This should work as long as TTY provides only valid utf8.
If the utf is invalid, assertion fails and the shell dies.
This commit is contained in:
Bananymous 2023-06-05 18:53:52 +03:00
parent 5af77dcfb9
commit 73c11c3d29
1 changed files with 49 additions and 18 deletions
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63
userspace/Shell/main.cpp
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@ -106,7 +106,7 @@ int main(int argc, char** argv)
size_t index = 0;
size_t col = 0;
bool got_csi = false;
int waiting_utf8 = 0;
BAN::String prompt("\e[32muser@host\e[m:\e[34m/\e[m$ "sv);
fprintf(stdout, "%s", prompt.data());
@ -114,30 +114,62 @@ int main(int argc, char** argv)
while (true)
{
char c;
fread(&c, 1, sizeof(char), stdin);
uint8_t ch;
fread(&ch, 1, sizeof(char), stdin);
switch (c)
if (waiting_utf8 > 0)
{
waiting_utf8--;
ASSERT((ch & 0xC0) == 0x80);
fputc(ch, stdout);
MUST(buffers[index].insert(ch, col++));
if (waiting_utf8 == 0)
{
fprintf(stdout, "\e[s%s\e[u", buffers[index].data() + col);
fflush(stdout);
}
continue;
}
else if (ch & 0x80)
{
if ((ch & 0xE0) == 0xC0)
waiting_utf8 = 1;
else if ((ch & 0xF0) == 0xE0)
waiting_utf8 = 2;
else if ((ch & 0xF8) == 0xF0)
waiting_utf8 = 3;
else
ASSERT_NOT_REACHED();
fputc(ch, stdout);
MUST(buffers[index].insert(ch, col++));
continue;
}
switch (ch)
{
case '\e':
fread(&c, 1, sizeof(char), stdin);
if (c != '[')
fread(&ch, 1, sizeof(char), stdin);
if (ch != '[')
break;
fread(&c, 1, sizeof(char), stdin);
switch (c)
fread(&ch, 1, sizeof(char), stdin);
switch (ch)
{
case 'A': if (index > 0) { index--; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", prompt_length(prompt) + 1, buffers[index].data()); fflush(stdout); } break;
case 'B': if (index < buffers.size() - 1) { index++; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", prompt_length(prompt) + 1, buffers[index].data()); fflush(stdout); } break;
case 'C': if (col < buffers[index].size() - 1) { col++; fprintf(stdout, "\e[C"); fflush(stdout); } break;
case 'D': if (col > 0) { col--; fprintf(stdout, "\e[D"); fflush(stdout); } break;
case 'C': if (col < buffers[index].size()) { col++; while ((buffers[index][col - 1] & 0xC0) == 0x80) col++; fprintf(stdout, "\e[C"); fflush(stdout); } break;
case 'D': if (col > 0) { while ((buffers[index][col - 1] & 0xC0) == 0x80) col--; col--; fprintf(stdout, "\e[D"); fflush(stdout); } break;
}
break;
case '\b':
if (col > 0)
{
col--;
buffers[index].remove(col);
fprintf(stdout, "\b\e[s%s\e[K\e[u", buffers[index].data() + col);
while ((buffers[index][col - 1] & 0xC0) == 0x80)
buffers[index].remove(--col);
buffers[index].remove(--col);
fprintf(stdout, "\b\e[s%s \e[u", buffers[index].data() + col);
fflush(stdout);
}
break;
@ -156,10 +188,9 @@ int main(int argc, char** argv)
col = 0;
break;
default:
MUST(buffers[index].push_back(c));
fprintf(stdout, "%s \b", buffers[index].data() + col);
MUST(buffers[index].insert(ch, col++));
fprintf(stdout, "%c\e[s%s\e[u", ch, buffers[index].data() + col);
fflush(stdout);
col++;
break;
}
}