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https://github.com/wrog/lambdamoo
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0c534fb806
scanf has too many annoying behaviors so we are replacing it. E.g., Pavel was unhappy about %* specs not being counted in the return value and was having to add 'dummy' variables all over. I myself am unhappy about how you can put a \n at the end of a pattern giving the false sense that you want it to match a newline when in fact there's no guarantee of that at all, or that, in ANY pattern with characters after the last % spec that you'll have any idea whether those characters were reached or not (hence the need for all of these %c-at-the-end bullshit patterns) But worst of all, you cannot count on E_RANGE errors being raised when they're needed because there's disagreement about when that should happen, putting this in the realm of undefined behavior (hence certain vendors putting deprecation warnings on %d and all of the other integer conversions) So.., fuck it. We write our own function from the ground up that does what we need (and very little more) and will thence be completely portable (knock wood). Well okay, it still relies on strtoimax() continuing to behave sensibly. We'll see how that goes. --wrog
169 lines
4.4 KiB
C
169 lines
4.4 KiB
C
/******************************************************************************
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Copyright (c) 1992, 1995, 1996 Xerox Corporation. All rights reserved.
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Portions of this code were written by Stephen White, aka ghond.
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Use and copying of this software and preparation of derivative works based
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upon this software are permitted. Any distribution of this software or
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derivative works must comply with all applicable United States export
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control laws. This software is made available AS IS, and Xerox Corporation
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makes no warranty about the software, its performance or its conformity to
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any specification. Any person obtaining a copy of this software is requested
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to send their name and post office or electronic mail address to:
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Pavel Curtis
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Xerox PARC
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3333 Coyote Hill Rd.
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Palo Alto, CA 94304
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Pavel@Xerox.Com
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*****************************************************************************/
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#include "eval_vm.h"
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#include "config.h"
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#include "options.h"
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#include "db_io.h"
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#include "decompile.h"
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#include "execute.h"
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#include "log.h"
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#include "storage.h"
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#include "structures.h"
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#include "tasks.h"
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/**** external functions ****/
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vm
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new_vm(TaskID task_id, int stack_size)
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{
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vm the_vm = mymalloc(sizeof(vmstruct), M_VM);
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the_vm->task_id = task_id;
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the_vm->activ_stack = mymalloc(sizeof(activation) * stack_size, M_VM);
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return the_vm;
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}
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void
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free_vm(vm the_vm, int stack_too)
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{
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int i;
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if (stack_too)
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for (i = the_vm->top_activ_stack; i >= 0; i--)
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free_activation(&the_vm->activ_stack[i], 1);
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myfree(the_vm->activ_stack, M_VM);
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myfree(the_vm, M_VM);
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}
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activation
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top_activ(vm the_vm)
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{
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return the_vm->activ_stack[the_vm->top_activ_stack];
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}
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Objid
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progr_of_cur_verb(vm the_vm)
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{
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return top_activ(the_vm).progr;
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}
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unsigned
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suspended_lineno_of_vm(vm the_vm)
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{
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activation top;
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top = top_activ(the_vm);
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return find_line_number(top.prog, (the_vm->top_activ_stack == 0
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? the_vm->root_activ_vector
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: MAIN_VECTOR),
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top.error_pc);
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}
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/**** read/write data base ****/
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void
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write_vm(vm the_vm)
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{
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unsigned i;
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dbio_printf("%u %d %u %u\n",
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the_vm->top_activ_stack, the_vm->root_activ_vector,
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the_vm->func_id, the_vm->max_stack_size);
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for (i = 0; i <= the_vm->top_activ_stack; i++)
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write_activ(the_vm->activ_stack[i]);
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}
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vm
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read_vm(TaskID task_id)
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{
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unsigned i, top, func_id, max;
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int vector;
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vm the_vm;
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int scn = dbio_scxnf("%u %d %u\v %u", &top, &vector, &func_id, &max);
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if (!scn) {
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errlog("READ_VM: Bad vm header\n");
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return 0;
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}
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else if (scn < 2)
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max = DEFAULT_MAX_STACK_DEPTH;
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the_vm = new_vm(task_id, top + 1);
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the_vm->max_stack_size = max;
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the_vm->top_activ_stack = top;
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the_vm->root_activ_vector = vector;
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the_vm->func_id = func_id;
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for (i = 0; i <= top; i++)
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if (!read_activ(&the_vm->activ_stack[i],
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i == 0 ? vector : MAIN_VECTOR)) {
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errlog("READ_VM: Bad activ number %d\n", i);
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return 0;
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}
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return the_vm;
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}
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/*
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* $Log$
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* Revision 2.2 1996/02/08 07:12:16 pavel
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* Renamed err/logf() to errlog/oklog(). Updated copyright notice for 1996.
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* Release 1.8.0beta1.
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*
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* Revision 2.1 1995/12/31 03:19:43 pavel
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* Added missing #include "options.h". Release 1.8.0alpha4.
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*
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* Revision 2.0 1995/11/30 04:22:07 pavel
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* New baseline version, corresponding to release 1.8.0alpha1.
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*
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* Revision 1.10 1993/12/21 23:40:11 pavel
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* Add new `outcome' result from the interpreter.
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*
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* Revision 1.9 1993/08/11 06:03:12 pavel
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* Fixed mistaken %d->%u change.
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*
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* Revision 1.8 1993/08/11 02:58:03 pavel
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* Changed some bogus %d's to %u's in calls to *scanf() and *printf(), guided
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* by warnings from GCC...
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*
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* Revision 1.7 1992/10/23 23:03:47 pavel
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* Added copyright notice.
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*
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* Revision 1.6 1992/10/21 03:02:35 pavel
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* Converted to use new automatic configuration system.
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*
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* Revision 1.5 1992/10/17 20:25:59 pavel
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* Changed return-type of read_vm() from `char' to `int', for systems that use
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* unsigned chars.
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*
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* Revision 1.4 1992/09/25 21:12:12 pjames
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* Passed correct pc (error_pc) to get_lineno.
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*
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* Revision 1.3 1992/09/02 18:43:11 pavel
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* Added mechanism for resuming a read()ing task with an error.
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*
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* Revision 1.2 1992/08/31 22:22:24 pjames
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* Changed some `char *'s to `const char *'
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*
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* Revision 1.1 1992/08/10 16:20:00 pjames
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* Initial RCS-controlled version
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*/
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