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Diffstat (limited to 'engines/glk/frotz/processor_variables.cpp')
| -rw-r--r-- | engines/glk/frotz/processor_variables.cpp | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/engines/glk/frotz/processor_variables.cpp b/engines/glk/frotz/processor_variables.cpp new file mode 100644 index 0000000000..0162f84d17 --- /dev/null +++ b/engines/glk/frotz/processor_variables.cpp @@ -0,0 +1,199 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +#include "glk/frotz/processor.h" + +namespace Gargoyle { +namespace Frotz { + +void Processor::z_dec() { + zword value; + + if (zargs[0] == 0) + (*_sp)--; + else if (zargs[0] < 16) + (*(_fp - zargs[0]))--; + else { + zword addr = h_globals + 2 * (zargs[0] - 16); + LOW_WORD(addr, value); + value--; + SET_WORD(addr, value); + } +} + +void Processor::z_dec_chk() { + zword value; + + if (zargs[0] == 0) + value = --(*_sp); + else if (zargs[0] < 16) + value = --(*(_fp - zargs[0])); + else { + zword addr = h_globals + 2 * (zargs[0] - 16); + LOW_WORD(addr, value); + value--; + SET_WORD(addr, value); + } + + branch((short)value < (short)zargs[1]); +} + +void Processor::z_inc() { + zword value; + + if (zargs[0] == 0) + (*_sp)++; + else if (zargs[0] < 16) + (*(_fp - zargs[0]))++; + else { + zword addr = h_globals + 2 * (zargs[0] - 16); + LOW_WORD(addr, value); + value++; + SET_WORD(addr, value); + } +} + +void Processor::z_inc_chk() { + zword value; + + if (zargs[0] == 0) + value = ++(*_sp); + else if (zargs[0] < 16) + value = ++(*(_fp - zargs[0])); + else { + zword addr = h_globals + 2 * (zargs[0] - 16); + LOW_WORD(addr, value); + value++; + SET_WORD(addr, value); + } + + branch((short)value > (short)zargs[1]); +} + +void Processor::z_load() { + zword value; + + if (zargs[0] == 0) + value = *_sp; + else if (zargs[0] < 16) + value = *(_fp - zargs[0]); + else { + zword addr = h_globals + 2 * (zargs[0] - 16); + LOW_WORD(addr, value); + } + + store(value); +} + +void Processor::z_pop() { + _sp++; +} + +void Processor::z_pop_stack() { + if (zargc == 2) { + // it's a user stack + zword size; + zword addr = zargs[1]; + + LOW_WORD(addr, size); + + size += zargs[0]; + storew(addr, size); + } else { + // it's the game stack + _sp += zargs[0]; + } +} + +void Processor::z_pull() { + zword value; + + if (h_version != V6) { + // not a V6 game, pop stack and write + value = *_sp++; + + if (zargs[0] == 0) + *_sp = value; + else if (zargs[0] < 16) + *(_fp - zargs[0]) = value; + else { + zword addr = h_globals + 2 * (zargs[0] - 16); + SET_WORD(addr, value); + } + } else { + // it's V6, but is there a user stack? + if (zargc == 1) { + // it's a user stack + zword size; + zword addr = zargs[0]; + + LOW_WORD(addr, size); + + size++; + storew(addr, size); + + addr += 2 * size; + LOW_WORD(addr, value); + } else { + // it's the game stack + value = *_sp++; + } + + store(value); + } +} + +void Processor::z_push() { + *--_sp = zargs[0]; +} + +void Processor::z_push_stack() { + zword size; + zword addr = zargs[1]; + + LOW_WORD(addr, size); + + if (size != 0) { + storew((zword)(addr + 2 * size), zargs[0]); + + size--; + storew(addr, size); + } + + branch(size); +} + +void Processor::z_store() { + zword value = zargs[1]; + + if (zargs[0] == 0) + *_sp = value; + else if (zargs[0] < 16) + *(_fp - zargs[0]) = value; + else { + zword addr = h_globals + 2 * (zargs[0] - 16); + SET_WORD(addr, value); + } +} + +} // End of namespace Scott +} // End of namespace Gargoyle |