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Merge pull request #549 from TomHarte/MSXPaste

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Simplifies and corrects MSX pasting behaviour.
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Thomas Harte 2018-09-11 21:47:41 -04:00 committed by GitHub
commit 12e9478a81
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1 changed files with 23 additions and 13 deletions
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36
Machines/MSX/MSX.cpp
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@ -298,7 +298,12 @@ class ConcreteMachine:
}
void type_string(const std::string &string) override final {
input_text_ += string;
std::transform(
string.begin(),
string.end(),
std::back_inserter(input_text_),
[](unsigned char c) -> unsigned char { return (c == '\n') ? '\r' : c; }
);
}
// MARK: MSX::MemoryMap
@ -500,26 +505,31 @@ class ConcreteMachine:
// Take this as a convenient moment to jump into the keyboard buffer, if desired.
if(!input_text_.empty()) {
// TODO: is it safe to assume these addresses?
// The following are KEYBUF per the Red Book; its address and its definition as DEFS 40.
const int buffer_start = 0xfbf0;
const int buffer_end = 0xfb18;
const int buffer_size = 40;
// Also from the Red Book: GETPNT is at F3FAH and PUTPNT is at F3F8H.
int read_address = ram_[0xf3fa] | (ram_[0xf3fb] << 8);
int write_address = ram_[0xf3f8] | (ram_[0xf3f9] << 8);
const int buffer_size = buffer_end - buffer_start;
int available_space = write_address + buffer_size - read_address - 1;
const std::size_t characters_to_write = std::min(static_cast<std::size_t>(available_space), input_text_.size());
// Write until either the string is exhausted or the write_pointer is immediately
// behind the read pointer; temporarily map write_address and read_address into
// buffer-relative values.
std::size_t characters_written = 0;
write_address -= buffer_start;
for(std::size_t c = 0; c < characters_to_write; ++c) {
char character = input_text_[c];
ram_[write_address + buffer_start] = static_cast<uint8_t>(character);
write_address = (write_address + 1) % buffer_size;
read_address -= buffer_start;
while(characters_written < input_text_.size()) {
const int next_write_address = (write_address + 1) % buffer_size;
if(next_write_address == read_address) break;
ram_[write_address + buffer_start] = static_cast<uint8_t>(input_text_[characters_written]);
++characters_written;
write_address = next_write_address;
}
write_address += buffer_start;
input_text_.erase(input_text_.begin(), input_text_.begin() + static_cast<std::string::difference_type>(characters_to_write));
input_text_.erase(input_text_.begin(), input_text_.begin() + static_cast<std::string::difference_type>(characters_written));
// Map the write address back into absolute terms and write it out again as PUTPNT.
write_address += buffer_start;
ram_[0xf3f8] = static_cast<uint8_t>(write_address);
ram_[0xf3f9] = static_cast<uint8_t>(write_address >> 8);
}