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/* printf, sscanf, fgets, fprintf */ |
/* -*- coding: utf-8; -*- */ |
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#include <stdio.h> |
/* |
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/* exit, EXIT_SUCCESS, malloc, free */ |
stack - an interactive interpreter for a stack-based language |
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#include <stdlib.h> |
Copyright (C) 2002 Mats Alritzson and Teddy Hogeborn |
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/* NULL */ |
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#include <stddef.h> |
This program is free software; you can redistribute it and/or modify |
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/* dlopen, dlsym, dlerror */ |
it under the terms of the GNU General Public License as published by |
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#include <dlfcn.h> |
the Free Software Foundation; either version 2 of the License, or |
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/* strcmp, strcpy, strlen, strcat, strdup */ |
(at your option) any later version. |
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#include <string.h> |
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This program is distributed in the hope that it will be useful, |
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#define HASHTBLSIZE 2048 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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/* First, define some types. */ |
GNU General Public License for more details. |
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/* A value of some type */ |
You should have received a copy of the GNU General Public License |
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typedef struct { |
along with this program; if not, write to the Free Software |
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enum { |
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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integer, |
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string, |
Authors: Mats Alritzson <masse@fukt.bth.se> |
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func, /* Function pointer */ |
Teddy Hogeborn <teddy@fukt.bth.se> |
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symb, |
*/ |
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list |
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} type; /* Type of stack element */ |
#include "stack.h" |
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union { |
const char* start_message= "Stack version $Revision$\n\ |
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void *ptr; /* Pointer to the content */ |
Copyright (C) 2002 Mats Alritzson and Teddy Hogeborn\n\ |
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int val; /* ...or an integer */ |
Stack comes with ABSOLUTELY NO WARRANTY; for details type 'warranty;'.\n\ |
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} content; /* Stores a pointer or an integer */ |
This is free software, and you are welcome to redistribute it\n\ |
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under certain conditions; type 'copying;' for details.\n"; |
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int refcount; /* Reference counter */ |
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} value; |
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/* A symbol with a name and possible value */ |
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/* (These do not need reference counters, they are kept unique by |
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hashing.) */ |
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typedef struct symbol_struct { |
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char *id; /* Symbol name */ |
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value *val; /* The value (if any) bound to it */ |
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struct symbol_struct *next; /* In case of hashing conflicts, a */ |
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} symbol; /* symbol is a kind of stack item. */ |
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/* A type for a hash table for symbols */ |
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typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */ |
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/* An item (value) on a stack */ |
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typedef struct stackitem_struct |
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{ |
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value *item; /* The value on the stack */ |
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/* (This is never NULL) */ |
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struct stackitem_struct *next; /* Next item */ |
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} stackitem; |
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/* An environment; gives access to the stack and a hash table of |
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defined symbols */ |
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typedef struct { |
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stackitem *head; /* Head of the stack */ |
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hashtbl symbols; /* Hash table of all variable bindings */ |
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int err; /* Error flag */ |
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char *in_string; /* Input pending to be read */ |
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char *free_string; /* Free this string when all input is |
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read from in_string */ |
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} environment; |
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/* A type for pointers to external functions */ |
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typedef void (*funcp)(environment *); /* funcp is a pointer to a void |
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function (environment *) */ |
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/* Initialize a newly created environment */ |
/* Initialize a newly created environment */ |
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void init_env(environment *env) |
void init_env(environment *env) |
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{ |
{ |
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int i; |
int i; |
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env->in_string= NULL; |
env->gc_limit= 400000; |
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env->err= 0; |
env->gc_count= 0; |
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env->gc_ref= NULL; |
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env->head= new_val(env); |
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for(i= 0; i<HASHTBLSIZE; i++) |
for(i= 0; i<HASHTBLSIZE; i++) |
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env->symbols[i]= NULL; |
env->symbols[i]= NULL; |
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env->err= 0; |
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env->in_string= NULL; |
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env->free_string= NULL; |
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env->inputstream= stdin; |
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env->interactive= 1; |
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} |
} |
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void printerr(const char* in_string) { |
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fprintf(stderr, "Err: %s\n", in_string); |
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} |
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/* Throw away a value */ |
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void free_val(value *val){ |
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stackitem *item, *temp; |
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val->refcount--; /* Decrease the reference count */ |
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if(val->refcount == 0){ |
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switch (val->type){ /* and free the contents if necessary */ |
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case string: |
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free(val->content.ptr); |
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break; |
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case list: /* lists needs to be freed recursively */ |
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item=val->content.ptr; |
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while(item != NULL) { /* for all stack items */ |
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free_val(item->item); /* free the value */ |
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temp=item->next; /* save next ptr */ |
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free(item); /* free the stackitem */ |
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item=temp; /* go to next stackitem */ |
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} |
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break; |
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case integer: |
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case func: |
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break; |
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case symb: |
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free(((symbol*)(val->content.ptr))->id); |
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if(((symbol*)(val->content.ptr))->val!=NULL) |
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free_val(((symbol*)(val->content.ptr))->val); |
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free(val->content.ptr); |
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break; |
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} |
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free(val); /* Free the actual list value */ |
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} |
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} |
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/* Discard the top element of the stack. */ |
void printerr(environment *env, const char* in_string) |
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extern void toss(environment *env) |
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{ |
{ |
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stackitem *temp= env->head; |
fprintf(stderr, "\"%s\":\nErr: %s\n", env->errsymb, in_string); |
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if((env->head)==NULL) { |
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printerr("Too Few Arguments"); |
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env->err=1; |
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return; |
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} |
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free_val(env->head->item); /* Free the value */ |
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env->head= env->head->next; /* Remove the top stack item */ |
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free(temp); /* Free the old top stack item */ |
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} |
} |
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/* Returns a pointer to a pointer to an element in the hash table. */ |
/* Returns a pointer to a pointer to an element in the hash table. */ |
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symbol **hash(hashtbl in_hashtbl, const char *in_string) |
symbol **hash(hashtbl in_hashtbl, const char *in_string) |
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{ |
{ |
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} |
} |
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} |
} |
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/* Create new value */ |
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value* new_val(environment *env) |
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{ |
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value *nval= malloc(sizeof(value)); |
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stackitem *nitem= malloc(sizeof(stackitem)); |
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assert(nval != NULL); |
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assert(nitem != NULL); |
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nval->content.ptr= NULL; |
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nval->type= empty; |
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101 |
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nitem->item= nval; |
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nitem->next= env->gc_ref; |
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env->gc_ref= nitem; |
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env->gc_count += sizeof(value); |
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nval->gc.flag.mark= 0; |
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nval->gc.flag.protect= 0; |
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return nval; |
111 |
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} |
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113 |
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/* Mark values recursively. |
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Marked values are not collected by the GC. */ |
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inline void gc_mark(value *val) |
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{ |
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if(val==NULL || val->gc.flag.mark) |
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return; |
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val->gc.flag.mark= 1; |
122 |
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123 |
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if(val->type==tcons) { |
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gc_mark(CAR(val)); |
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gc_mark(CDR(val)); |
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} |
127 |
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} |
128 |
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129 |
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/* Start GC */ |
131 |
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extern void gc_init(environment *env) |
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{ |
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stackitem *new_head= NULL, *titem; |
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symbol *tsymb; |
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int i; |
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if(env->interactive) |
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printf("Garbage collecting."); |
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/* Mark values on stack */ |
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gc_mark(env->head); |
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if(env->interactive) |
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printf("."); |
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/* Mark values in hashtable */ |
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for(i= 0; i<HASHTBLSIZE; i++) |
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for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next) |
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if (tsymb->val != NULL) |
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gc_mark(tsymb->val); |
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if(env->interactive) |
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printf("."); |
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env->gc_count= 0; |
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while(env->gc_ref!=NULL) { /* Sweep unused values */ |
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if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */ |
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/* Remove content */ |
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switch(env->gc_ref->item->type){ |
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case string: |
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free(env->gc_ref->item->content.string); |
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break; |
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case tcons: |
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free(env->gc_ref->item->content.c); |
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break; |
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case port: |
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case empty: |
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case unknown: |
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case integer: |
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case tfloat: |
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case func: |
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case symb: |
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/* Symbol strings are freed when walking the hash table */ |
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break; |
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} |
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free(env->gc_ref->item); /* Remove from gc_ref */ |
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titem= env->gc_ref->next; |
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free(env->gc_ref); /* Remove value */ |
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env->gc_ref= titem; |
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continue; |
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} |
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#ifdef DEBUG |
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printf("Kept value (%p)", env->gc_ref->item); |
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if(env->gc_ref->item->gc.flag.mark) |
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printf(" (marked)"); |
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if(env->gc_ref->item->gc.flag.protect) |
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printf(" (protected)"); |
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switch(env->gc_ref->item->type){ |
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case integer: |
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printf(" integer: %d", env->gc_ref->item->content.i); |
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break; |
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case func: |
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printf(" func: %p", env->gc_ref->item->content.func); |
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break; |
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case symb: |
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printf(" symb: %s", env->gc_ref->item->content.sym->id); |
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break; |
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case tcons: |
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printf(" tcons: %p\t%p", CAR(env->gc_ref->item), |
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CDR(env->gc_ref->item)); |
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break; |
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default: |
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printf(" <unknown %d>", (env->gc_ref->item->type)); |
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} |
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printf("\n"); |
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#endif /* DEBUG */ |
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/* Keep values */ |
213 |
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env->gc_count += sizeof(value); |
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if(env->gc_ref->item->type==string) |
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env->gc_count += strlen(env->gc_ref->item->content.string)+1; |
216 |
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217 |
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titem= env->gc_ref->next; |
218 |
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env->gc_ref->next= new_head; |
219 |
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new_head= env->gc_ref; |
220 |
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new_head->item->gc.flag.mark= 0; |
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env->gc_ref= titem; |
222 |
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} |
223 |
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224 |
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if (env->gc_limit < env->gc_count*2) |
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env->gc_limit= env->gc_count*2; |
226 |
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env->gc_ref= new_head; |
228 |
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229 |
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if(env->interactive) |
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printf("done (%d bytes still allocated)\n", env->gc_count); |
231 |
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} |
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inline void gc_maybe(environment *env) |
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{ |
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if(env->gc_count < env->gc_limit) |
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return; |
239 |
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else |
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return gc_init(env); |
241 |
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} |
242 |
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243 |
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244 |
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/* Protect values from GC */ |
245 |
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void protect(value *val) |
246 |
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{ |
247 |
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if(val==NULL || val->gc.flag.protect) |
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return; |
249 |
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250 |
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val->gc.flag.protect= 1; |
251 |
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252 |
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if(val->type==tcons) { |
253 |
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protect(CAR(val)); |
254 |
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protect(CDR(val)); |
255 |
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} |
256 |
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} |
257 |
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258 |
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259 |
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/* Unprotect values from GC */ |
260 |
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void unprotect(value *val) |
261 |
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{ |
262 |
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if(val==NULL || !(val->gc.flag.protect)) |
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return; |
264 |
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265 |
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val->gc.flag.protect= 0; |
266 |
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267 |
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if(val->type==tcons) { |
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unprotect(CAR(val)); |
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unprotect(CDR(val)); |
270 |
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} |
271 |
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} |
272 |
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273 |
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274 |
/* Push a value onto the stack */ |
/* Push a value onto the stack */ |
275 |
void push_val(environment *env, value *val) |
void push_val(environment *env, value *val) |
276 |
{ |
{ |
277 |
stackitem *new_item= malloc(sizeof(stackitem)); |
value *new_value= new_val(env); |
278 |
new_item->item= val; |
|
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val->refcount++; |
new_value->content.c= malloc(sizeof(pair)); |
280 |
new_item->next= env->head; |
assert(new_value->content.c!=NULL); |
281 |
env->head= new_item; |
env->gc_count += sizeof(pair); |
282 |
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new_value->type= tcons; |
283 |
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CAR(new_value)= val; |
284 |
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CDR(new_value)= env->head; |
285 |
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env->head= new_value; |
286 |
} |
} |
287 |
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288 |
/* Push an integer onto the stack. */ |
|
289 |
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/* Push an integer onto the stack */ |
290 |
void push_int(environment *env, int in_val) |
void push_int(environment *env, int in_val) |
291 |
{ |
{ |
292 |
value *new_value= malloc(sizeof(value)); |
value *new_value= new_val(env); |
293 |
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294 |
new_value->content.val= in_val; |
new_value->content.i= in_val; |
295 |
new_value->type= integer; |
new_value->type= integer; |
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new_value->refcount= 1; |
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296 |
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297 |
push_val(env, new_value); |
push_val(env, new_value); |
298 |
} |
} |
299 |
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300 |
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301 |
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/* Push a floating point number onto the stack */ |
302 |
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void push_float(environment *env, float in_val) |
303 |
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{ |
304 |
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value *new_value= new_val(env); |
305 |
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306 |
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new_value->content.f= in_val; |
307 |
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new_value->type= tfloat; |
308 |
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309 |
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push_val(env, new_value); |
310 |
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} |
311 |
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312 |
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313 |
/* Copy a string onto the stack. */ |
/* Copy a string onto the stack. */ |
314 |
void push_cstring(environment *env, const char *in_string) |
void push_cstring(environment *env, const char *in_string) |
315 |
{ |
{ |
316 |
value *new_value= malloc(sizeof(value)); |
value *new_value= new_val(env); |
317 |
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int length= strlen(in_string)+1; |
318 |
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319 |
new_value->content.ptr= malloc(strlen(in_string)+1); |
new_value->content.string= malloc(length); |
320 |
strcpy(new_value->content.ptr, in_string); |
assert(new_value != NULL); |
321 |
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env->gc_count += length; |
322 |
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strcpy(new_value->content.string, in_string); |
323 |
new_value->type= string; |
new_value->type= string; |
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new_value->refcount= 1; |
|
324 |
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325 |
push_val(env, new_value); |
push_val(env, new_value); |
326 |
} |
} |
327 |
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328 |
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|
329 |
/* Mangle a symbol name to a valid C identifier name */ |
/* Mangle a symbol name to a valid C identifier name */ |
330 |
char *mangle_str(const char *old_string){ |
char *mangle_str(const char *old_string) |
331 |
char validchars[] |
{ |
332 |
="0123456789abcdef"; |
char validchars[]= "0123456789abcdef"; |
333 |
char *new_string, *current; |
char *new_string, *current; |
334 |
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|
335 |
new_string=malloc((strlen(old_string)*2)+4); |
new_string= malloc((strlen(old_string)*2)+4); |
336 |
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assert(new_string != NULL); |
337 |
strcpy(new_string, "sx_"); /* Stack eXternal */ |
strcpy(new_string, "sx_"); /* Stack eXternal */ |
338 |
current=new_string+3; |
current= new_string+3; |
339 |
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|
340 |
while(old_string[0] != '\0'){ |
while(old_string[0] != '\0'){ |
341 |
current[0]=validchars[(unsigned char)(old_string[0])/16]; |
current[0]= validchars[(unsigned char)(old_string[0])/16]; |
342 |
current[1]=validchars[(unsigned char)(old_string[0])%16]; |
current[1]= validchars[(unsigned char)(old_string[0])%16]; |
343 |
current+=2; |
current+= 2; |
344 |
old_string++; |
old_string++; |
345 |
} |
} |
346 |
current[0]='\0'; |
current[0]= '\0'; |
347 |
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|
348 |
return new_string; /* The caller must free() it */ |
return new_string; /* The caller must free() it */ |
349 |
} |
} |
350 |
|
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extern void mangle(environment *env){ |
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char *new_string; |
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if((env->head)==NULL) { |
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printerr("Too Few Arguments"); |
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env->err=1; |
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return; |
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} |
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if(env->head->item->type!=string) { |
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printerr("Bad Argument Type"); |
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env->err=2; |
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return; |
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} |
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new_string= mangle_str((const char *)(env->head->item->content.ptr)); |
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|
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toss(env); |
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if(env->err) return; |
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|
push_cstring(env, new_string); |
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} |
|
351 |
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|
352 |
/* Push a symbol onto the stack. */ |
/* Push a symbol onto the stack. */ |
353 |
void push_sym(environment *env, const char *in_string) |
void push_sym(environment *env, const char *in_string) |
364 |
const char *dlerr; /* Dynamic linker error */ |
const char *dlerr; /* Dynamic linker error */ |
365 |
char *mangled; /* Mangled function name */ |
char *mangled; /* Mangled function name */ |
366 |
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|
367 |
new_value= malloc(sizeof(value)); |
new_value= new_val(env); |
368 |
|
new_fvalue= new_val(env); |
369 |
|
|
370 |
/* The new value is a symbol */ |
/* The new value is a symbol */ |
371 |
new_value->type= symb; |
new_value->type= symb; |
|
new_value->refcount= 1; |
|
372 |
|
|
373 |
/* Look up the symbol name in the hash table */ |
/* Look up the symbol name in the hash table */ |
374 |
new_symbol= hash(env->symbols, in_string); |
new_symbol= hash(env->symbols, in_string); |
375 |
new_value->content.ptr= *new_symbol; |
new_value->content.sym= *new_symbol; |
376 |
|
|
377 |
if(*new_symbol==NULL) { /* If symbol was undefined */ |
if(*new_symbol==NULL) { /* If symbol was undefined */ |
378 |
|
|
379 |
/* Create a new symbol */ |
/* Create a new symbol */ |
380 |
(*new_symbol)= malloc(sizeof(symbol)); |
(*new_symbol)= malloc(sizeof(symbol)); |
381 |
|
assert((*new_symbol) != NULL); |
382 |
(*new_symbol)->val= NULL; /* undefined value */ |
(*new_symbol)->val= NULL; /* undefined value */ |
383 |
(*new_symbol)->next= NULL; |
(*new_symbol)->next= NULL; |
384 |
(*new_symbol)->id= malloc(strlen(in_string)+1); |
(*new_symbol)->id= malloc(strlen(in_string)+1); |
385 |
|
assert((*new_symbol)->id != NULL); |
386 |
strcpy((*new_symbol)->id, in_string); |
strcpy((*new_symbol)->id, in_string); |
387 |
|
|
388 |
/* Intern the new symbol in the hash table */ |
/* Intern the new symbol in the hash table */ |
389 |
new_value->content.ptr= *new_symbol; |
new_value->content.sym= *new_symbol; |
390 |
|
|
391 |
/* Try to load the symbol name as an external function, to see if |
/* Try to load the symbol name as an external function, to see if |
392 |
we should bind the symbol to a new function pointer value */ |
we should bind the symbol to a new function pointer value */ |
393 |
if(handle==NULL) /* If no handle */ |
if(handle==NULL) /* If no handle */ |
394 |
handle= dlopen(NULL, RTLD_LAZY); |
handle= dlopen(NULL, RTLD_LAZY); |
395 |
|
|
396 |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
mangled= mangle_str(in_string); /* mangle the name */ |
397 |
dlerr=dlerror(); |
funcptr= dlsym(handle, mangled); /* and try to find it */ |
398 |
|
|
399 |
|
dlerr= dlerror(); |
400 |
if(dlerr != NULL) { /* If no function was found */ |
if(dlerr != NULL) { /* If no function was found */ |
401 |
mangled=mangle_str(in_string); |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
402 |
funcptr= dlsym(handle, mangled); /* try mangling it */ |
dlerr= dlerror(); |
|
free(mangled); |
|
|
dlerr=dlerror(); |
|
403 |
} |
} |
404 |
|
|
405 |
if(dlerr==NULL) { /* If a function was found */ |
if(dlerr==NULL) { /* If a function was found */ |
406 |
new_fvalue= malloc(sizeof(value)); /* Create a new value */ |
new_fvalue->type= func; /* The new value is a function pointer */ |
407 |
new_fvalue->type=func; /* The new value is a function pointer */ |
new_fvalue->content.func= funcptr; /* Store function pointer */ |
|
new_fvalue->content.ptr=funcptr; /* Store function pointer */ |
|
408 |
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
409 |
function value */ |
function value */ |
|
new_fvalue->refcount= 1; |
|
410 |
} |
} |
411 |
|
|
412 |
|
free(mangled); |
413 |
} |
} |
|
push_val(env, new_value); |
|
|
} |
|
414 |
|
|
415 |
/* Print newline. */ |
push_val(env, new_value); |
|
extern void nl() |
|
|
{ |
|
|
printf("\n"); |
|
416 |
} |
} |
417 |
|
|
|
/* Gets the type of a value */ |
|
|
extern void type(environment *env){ |
|
|
int typenum; |
|
418 |
|
|
419 |
if((env->head)==NULL) { |
/* Print a value */ |
420 |
printerr("Too Few Arguments"); |
void print_val(environment *env, value *val, int noquote, stackitem *stack, |
421 |
env->err=1; |
FILE *stream) |
422 |
return; |
{ |
423 |
} |
stackitem *titem, *tstack; |
424 |
typenum=env->head->item->type; |
int depth; |
425 |
toss(env); |
|
426 |
switch(typenum){ |
switch(val->type) { |
427 |
case integer: |
case empty: |
428 |
push_sym(env, "integer"); |
if(fprintf(stream, "[]") < 0){ |
429 |
break; |
perror("print_val"); |
430 |
case string: |
env->err= 5; |
431 |
push_sym(env, "string"); |
return; |
432 |
break; |
} |
|
case symb: |
|
|
push_sym(env, "symbol"); |
|
|
break; |
|
|
case func: |
|
|
push_sym(env, "function"); |
|
433 |
break; |
break; |
434 |
case list: |
case unknown: |
435 |
push_sym(env, "list"); |
if(fprintf(stream, "UNKNOWN") < 0){ |
436 |
|
perror("print_val"); |
437 |
|
env->err= 5; |
438 |
|
return; |
439 |
|
} |
440 |
break; |
break; |
|
} |
|
|
} |
|
|
|
|
|
/* Prints the top element of the stack. */ |
|
|
void print_h(stackitem *stack_head, int noquote) |
|
|
{ |
|
|
switch(stack_head->item->type) { |
|
441 |
case integer: |
case integer: |
442 |
printf("%d", stack_head->item->content.val); |
if(fprintf(stream, "%d", val->content.i) < 0){ |
443 |
|
perror("print_val"); |
444 |
|
env->err= 5; |
445 |
|
return; |
446 |
|
} |
447 |
|
break; |
448 |
|
case tfloat: |
449 |
|
if(fprintf(stream, "%f", val->content.f) < 0){ |
450 |
|
perror("print_val"); |
451 |
|
env->err= 5; |
452 |
|
return; |
453 |
|
} |
454 |
break; |
break; |
455 |
case string: |
case string: |
456 |
if(noquote) |
if(noquote){ |
457 |
printf("%s", (char*)stack_head->item->content.ptr); |
if(fprintf(stream, "%s", val->content.string) < 0){ |
458 |
else |
perror("print_val"); |
459 |
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
env->err= 5; |
460 |
|
return; |
461 |
|
} |
462 |
|
} else { /* quote */ |
463 |
|
if(fprintf(stream, "\"%s\"", val->content.string) < 0){ |
464 |
|
perror("print_val"); |
465 |
|
env->err= 5; |
466 |
|
return; |
467 |
|
} |
468 |
|
} |
469 |
break; |
break; |
470 |
case symb: |
case symb: |
471 |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
if(fprintf(stream, "%s", val->content.sym->id) < 0){ |
472 |
|
perror("print_val"); |
473 |
|
env->err= 5; |
474 |
|
return; |
475 |
|
} |
476 |
break; |
break; |
477 |
case func: |
case func: |
478 |
printf("#<function %p>", (funcp)(stack_head->item->content.ptr)); |
if(fprintf(stream, "#<function %p>", val->content.func) < 0){ |
479 |
|
perror("print_val"); |
480 |
|
env->err= 5; |
481 |
|
return; |
482 |
|
} |
483 |
break; |
break; |
484 |
case list: |
case port: |
485 |
/* A list is just a stack, so make stack_head point to it */ |
if(fprintf(stream, "#<port %p>", val->content.p) < 0){ |
486 |
stack_head=(stackitem *)(stack_head->item->content.ptr); |
perror("print_val"); |
487 |
printf("[ "); |
env->err= 5; |
488 |
while(stack_head != NULL) { |
return; |
|
print_h(stack_head, noquote); |
|
|
printf(" "); |
|
|
stack_head=stack_head->next; |
|
489 |
} |
} |
|
printf("]"); |
|
490 |
break; |
break; |
491 |
} |
case tcons: |
492 |
} |
if(fprintf(stream, "[ ") < 0){ |
493 |
|
perror("print_val"); |
494 |
|
env->err= 5; |
495 |
|
return; |
496 |
|
} |
497 |
|
tstack= stack; |
498 |
|
|
499 |
extern void print_(environment *env) { |
do { |
500 |
if(env->head==NULL) { |
titem=malloc(sizeof(stackitem)); |
501 |
printerr("Too Few Arguments"); |
assert(titem != NULL); |
502 |
env->err=1; |
titem->item=val; |
503 |
return; |
titem->next=tstack; |
504 |
} |
tstack=titem; /* Put it on the stack */ |
505 |
print_h(env->head, 0); |
/* Search a stack of values being printed to see if we are already |
506 |
nl(); |
printing this value */ |
507 |
} |
titem=tstack; |
508 |
|
depth=0; |
509 |
|
|
510 |
|
while(titem != NULL && titem->item != CAR(val)){ |
511 |
|
titem=titem->next; |
512 |
|
depth++; |
513 |
|
} |
514 |
|
|
515 |
/* Prints the top element of the stack and then discards it. */ |
if(titem != NULL){ /* If we found it on the stack, */ |
516 |
extern void print(environment *env) |
if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */ |
517 |
{ |
perror("print_val"); |
518 |
print_(env); |
env->err= 5; |
519 |
if(env->err) return; |
free(titem); |
520 |
toss(env); |
return; |
521 |
} |
} |
522 |
|
} else { |
523 |
|
print_val(env, CAR(val), noquote, tstack, stream); |
524 |
|
} |
525 |
|
|
526 |
extern void princ_(environment *env) { |
val= CDR(val); |
527 |
if(env->head==NULL) { |
switch(val->type){ |
528 |
printerr("Too Few Arguments"); |
case empty: |
529 |
env->err=1; |
break; |
530 |
return; |
case tcons: |
531 |
} |
/* Search a stack of values being printed to see if we are already |
532 |
print_h(env->head, 1); |
printing this value */ |
533 |
} |
titem=tstack; |
534 |
|
depth=0; |
535 |
|
|
536 |
|
while(titem != NULL && titem->item != val){ |
537 |
|
titem=titem->next; |
538 |
|
depth++; |
539 |
|
} |
540 |
|
if(titem != NULL){ /* If we found it on the stack, */ |
541 |
|
if(fprintf(stream, " . #%d#", depth) < 0){ /* print a depth reference */ |
542 |
|
perror("print_val"); |
543 |
|
env->err= 5; |
544 |
|
goto printval_end; |
545 |
|
} |
546 |
|
} else { |
547 |
|
if(fprintf(stream, " ") < 0){ |
548 |
|
perror("print_val"); |
549 |
|
env->err= 5; |
550 |
|
goto printval_end; |
551 |
|
} |
552 |
|
} |
553 |
|
break; |
554 |
|
default: |
555 |
|
if(fprintf(stream, " . ") < 0){ /* Improper list */ |
556 |
|
perror("print_val"); |
557 |
|
env->err= 5; |
558 |
|
goto printval_end; |
559 |
|
} |
560 |
|
print_val(env, val, noquote, tstack, stream); |
561 |
|
} |
562 |
|
} while(val->type == tcons && titem == NULL); |
563 |
|
|
564 |
/* Prints the top element of the stack and then discards it. */ |
printval_end: |
|
extern void princ(environment *env) |
|
|
{ |
|
|
princ_(env); |
|
|
if(env->err) return; |
|
|
toss(env); |
|
|
} |
|
565 |
|
|
566 |
/* Only to be called by function printstack. */ |
titem=tstack; |
567 |
void print_st(stackitem *stack_head, long counter) |
while(titem != stack){ |
568 |
{ |
tstack=titem->next; |
569 |
if(stack_head->next != NULL) |
free(titem); |
570 |
print_st(stack_head->next, counter+1); |
titem=tstack; |
571 |
printf("%ld: ", counter); |
} |
|
print_h(stack_head, 0); |
|
|
nl(); |
|
|
} |
|
572 |
|
|
573 |
/* Prints the stack. */ |
if(! (env->err)){ |
574 |
extern void printstack(environment *env) |
if(fprintf(stream, " ]") < 0){ |
575 |
{ |
perror("print_val"); |
576 |
if(env->head == NULL) { |
env->err= 5; |
577 |
printf("Stack Empty\n"); |
} |
578 |
return; |
} |
579 |
|
break; |
580 |
} |
} |
|
print_st(env->head, 1); |
|
581 |
} |
} |
582 |
|
|
583 |
|
|
584 |
/* Swap the two top elements on the stack. */ |
/* Swap the two top elements on the stack. */ |
585 |
extern void swap(environment *env) |
extern void swap(environment *env) |
586 |
{ |
{ |
587 |
stackitem *temp= env->head; |
value *temp= env->head; |
588 |
|
|
589 |
if(env->head==NULL || env->head->next==NULL) { |
if(env->head->type == empty || CDR(env->head)->type == empty) { |
590 |
printerr("Too Few Arguments"); |
printerr(env, "Too Few Arguments"); |
591 |
env->err=1; |
env->err=1; |
592 |
return; |
return; |
593 |
} |
} |
594 |
|
|
595 |
env->head= env->head->next; |
env->head= CDR(env->head); |
596 |
temp->next= env->head->next; |
CDR(temp)= CDR(env->head); |
597 |
env->head->next= temp; |
CDR(env->head)= temp; |
598 |
} |
} |
599 |
|
|
|
/* Rotate the first three elements on the stack. */ |
|
|
extern void rot(environment *env) |
|
|
{ |
|
|
stackitem *temp= env->head; |
|
|
|
|
|
if(env->head==NULL || env->head->next==NULL |
|
|
|| env->head->next->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
env->head= env->head->next->next; |
|
|
temp->next->next= env->head->next; |
|
|
env->head->next= temp; |
|
|
} |
|
600 |
|
|
601 |
/* Recall a value from a symbol, if bound */ |
/* Recall a value from a symbol, if bound */ |
602 |
extern void rcl(environment *env) |
extern void rcl(environment *env) |
603 |
{ |
{ |
604 |
value *val; |
value *val; |
605 |
|
|
606 |
if(env->head == NULL) { |
if(env->head->type==empty) { |
607 |
printerr("Too Few Arguments"); |
printerr(env, "Too Few Arguments"); |
608 |
env->err=1; |
env->err= 1; |
609 |
return; |
return; |
610 |
} |
} |
611 |
|
|
612 |
if(env->head->item->type!=symb) { |
if(CAR(env->head)->type!=symb) { |
613 |
printerr("Bad Argument Type"); |
printerr(env, "Bad Argument Type"); |
614 |
env->err=2; |
env->err= 2; |
615 |
return; |
return; |
616 |
} |
} |
617 |
|
|
618 |
val=((symbol *)(env->head->item->content.ptr))->val; |
val= CAR(env->head)->content.sym->val; |
619 |
if(val == NULL){ |
if(val == NULL){ |
620 |
printerr("Unbound Variable"); |
printerr(env, "Unbound Variable"); |
621 |
env->err=3; |
env->err= 3; |
622 |
return; |
return; |
623 |
} |
} |
624 |
toss(env); /* toss the symbol */ |
push_val(env, val); /* Return the symbol's bound value */ |
625 |
|
swap(env); |
626 |
if(env->err) return; |
if(env->err) return; |
627 |
push_val(env, val); /* Return its bound value */ |
env->head= CDR(env->head); |
628 |
} |
} |
629 |
|
|
630 |
|
|
631 |
/* If the top element is a symbol, determine if it's bound to a |
/* If the top element is a symbol, determine if it's bound to a |
632 |
function value, and if it is, toss the symbol and execute the |
function value, and if it is, toss the symbol and execute the |
633 |
function. */ |
function. */ |
635 |
{ |
{ |
636 |
funcp in_func; |
funcp in_func; |
637 |
value* temp_val; |
value* temp_val; |
638 |
stackitem* iterator; |
value* iterator; |
639 |
|
|
640 |
eval_start: |
eval_start: |
641 |
|
|
642 |
if(env->head==NULL) { |
gc_maybe(env); |
643 |
printerr("Too Few Arguments"); |
|
644 |
env->err=1; |
if(env->head->type==empty) { |
645 |
|
printerr(env, "Too Few Arguments"); |
646 |
|
env->err= 1; |
647 |
return; |
return; |
648 |
} |
} |
649 |
|
|
650 |
switch(env->head->item->type) { |
switch(CAR(env->head)->type) { |
651 |
/* if it's a symbol */ |
/* if it's a symbol */ |
652 |
case symb: |
case symb: |
653 |
|
env->errsymb= CAR(env->head)->content.sym->id; |
654 |
rcl(env); /* get its contents */ |
rcl(env); /* get its contents */ |
655 |
if(env->err) return; |
if(env->err) return; |
656 |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
if(CAR(env->head)->type!=symb){ /* don't recurse symbols */ |
657 |
goto eval_start; |
goto eval_start; |
658 |
} |
} |
659 |
return; |
return; |
660 |
|
|
661 |
/* If it's a lone function value, run it */ |
/* If it's a lone function value, run it */ |
662 |
case func: |
case func: |
663 |
in_func= (funcp)(env->head->item->content.ptr); |
in_func= CAR(env->head)->content.func; |
664 |
toss(env); |
env->head= CDR(env->head); |
665 |
if(env->err) return; |
return in_func(env); |
|
return (*in_func)(env); |
|
666 |
|
|
667 |
/* If it's a list */ |
/* If it's a list */ |
668 |
case list: |
case tcons: |
669 |
temp_val= env->head->item; |
temp_val= CAR(env->head); |
670 |
env->head->item->refcount++; |
protect(temp_val); |
671 |
toss(env); |
|
672 |
if(env->err) return; |
env->head= CDR(env->head); |
673 |
iterator= (stackitem*)temp_val->content.ptr; |
iterator= temp_val; |
674 |
while(iterator!=NULL) { |
|
675 |
push_val(env, iterator->item); |
while(iterator->type != empty) { |
676 |
if(env->head->item->type==symb |
push_val(env, CAR(iterator)); |
677 |
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
|
678 |
toss(env); |
if(CAR(env->head)->type==symb |
679 |
if(env->err) return; |
&& CAR(env->head)->content.sym->id[0]==';') { |
680 |
if(iterator->next == NULL){ |
env->head= CDR(env->head); |
681 |
free_val(temp_val); |
|
682 |
|
if(CDR(iterator)->type == empty){ |
683 |
goto eval_start; |
goto eval_start; |
684 |
} |
} |
685 |
eval(env); |
eval(env); |
686 |
if(env->err) return; |
if(env->err) return; |
687 |
} |
} |
688 |
iterator= iterator->next; |
if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons) |
689 |
|
iterator= CDR(iterator); |
690 |
|
else { |
691 |
|
printerr(env, "Bad Argument Type"); /* Improper list */ |
692 |
|
env->err= 2; |
693 |
|
return; |
694 |
|
} |
695 |
} |
} |
696 |
free_val(temp_val); |
unprotect(temp_val); |
|
return; |
|
|
|
|
|
default: |
|
|
return; |
|
|
} |
|
|
} |
|
|
|
|
|
/* Reverse (flip) a list */ |
|
|
extern void rev(environment *env){ |
|
|
stackitem *old_head, *new_head, *item; |
|
|
|
|
|
if((env->head)==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->item->type!=list) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
|
|
|
|
old_head=(stackitem *)(env->head->item->content.ptr); |
|
|
new_head=NULL; |
|
|
while(old_head != NULL){ |
|
|
item=old_head; |
|
|
old_head=old_head->next; |
|
|
item->next=new_head; |
|
|
new_head=item; |
|
|
} |
|
|
env->head->item->content.ptr=new_head; |
|
|
} |
|
|
|
|
|
/* Make a list. */ |
|
|
extern void pack(environment *env) |
|
|
{ |
|
|
stackitem *iterator, *temp; |
|
|
value *pack; |
|
|
|
|
|
iterator= env->head; |
|
|
|
|
|
if(iterator==NULL |
|
|
|| (iterator->item->type==symb |
|
|
&& ((symbol*)(iterator->item->content.ptr))->id[0]=='[')) { |
|
|
temp= NULL; |
|
|
toss(env); |
|
|
} else { |
|
|
/* Search for first delimiter */ |
|
|
while(iterator->next!=NULL |
|
|
&& (iterator->next->item->type!=symb |
|
|
|| ((symbol*)(iterator->next->item->content.ptr))->id[0]!='[')) |
|
|
iterator= iterator->next; |
|
|
|
|
|
/* Extract list */ |
|
|
temp= env->head; |
|
|
env->head= iterator->next; |
|
|
iterator->next= NULL; |
|
|
|
|
|
if(env->head!=NULL) |
|
|
toss(env); |
|
|
} |
|
|
|
|
|
/* Push list */ |
|
|
pack= malloc(sizeof(value)); |
|
|
pack->type= list; |
|
|
pack->content.ptr= temp; |
|
|
pack->refcount= 1; |
|
|
|
|
|
push_val(env, pack); |
|
|
rev(env); |
|
|
} |
|
|
|
|
|
/* Relocate elements of the list on the stack. */ |
|
|
extern void expand(environment *env) |
|
|
{ |
|
|
stackitem *temp, *new_head; |
|
|
|
|
|
/* Is top element a list? */ |
|
|
if(env->head==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
697 |
return; |
return; |
|
} |
|
|
if(env->head->item->type!=list) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
698 |
|
|
699 |
rev(env); |
case empty: |
700 |
|
env->head= CDR(env->head); |
701 |
if(env->err) |
case integer: |
702 |
return; |
case tfloat: |
703 |
|
case string: |
704 |
/* The first list element is the new stack head */ |
case port: |
705 |
new_head= temp= env->head->item->content.ptr; |
case unknown: |
|
|
|
|
env->head->item->refcount++; |
|
|
toss(env); |
|
|
|
|
|
/* Find the end of the list */ |
|
|
while(temp->next!=NULL) |
|
|
temp= temp->next; |
|
|
|
|
|
/* Connect the tail of the list with the old stack head */ |
|
|
temp->next= env->head; |
|
|
env->head= new_head; /* ...and voila! */ |
|
|
|
|
|
} |
|
|
|
|
|
/* Compares two elements by reference. */ |
|
|
extern void eq(environment *env) |
|
|
{ |
|
|
void *left, *right; |
|
|
int result; |
|
|
|
|
|
if((env->head)==NULL || env->head->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
left= env->head->item->content.ptr; |
|
|
swap(env); |
|
|
right= env->head->item->content.ptr; |
|
|
result= (left==right); |
|
|
|
|
|
toss(env); toss(env); |
|
|
push_int(env, result); |
|
|
} |
|
|
|
|
|
/* Negates the top element on the stack. */ |
|
|
extern void not(environment *env) |
|
|
{ |
|
|
int val; |
|
|
|
|
|
if((env->head)==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->item->type!=integer) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
|
|
|
|
val= env->head->item->content.val; |
|
|
toss(env); |
|
|
push_int(env, !val); |
|
|
} |
|
|
|
|
|
/* Compares the two top elements on the stack and return 0 if they're the |
|
|
same. */ |
|
|
extern void neq(environment *env) |
|
|
{ |
|
|
eq(env); |
|
|
not(env); |
|
|
} |
|
|
|
|
|
/* Give a symbol some content. */ |
|
|
extern void def(environment *env) |
|
|
{ |
|
|
symbol *sym; |
|
|
|
|
|
/* Needs two values on the stack, the top one must be a symbol */ |
|
|
if(env->head==NULL || env->head->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->item->type!=symb) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
706 |
return; |
return; |
707 |
} |
} |
|
|
|
|
/* long names are a pain */ |
|
|
sym=env->head->item->content.ptr; |
|
|
|
|
|
/* if the symbol was bound to something else, throw it away */ |
|
|
if(sym->val != NULL) |
|
|
free_val(sym->val); |
|
|
|
|
|
/* Bind the symbol to the value */ |
|
|
sym->val= env->head->next->item; |
|
|
sym->val->refcount++; /* Increase the reference counter */ |
|
|
|
|
|
toss(env); toss(env); |
|
|
} |
|
|
|
|
|
extern void clear(environment *); |
|
|
void forget_sym(symbol **); |
|
|
|
|
|
/* Quit stack. */ |
|
|
extern void quit(environment *env) |
|
|
{ |
|
|
long i; |
|
|
|
|
|
clear(env); |
|
|
if (env->err) return; |
|
|
for(i= 0; i<HASHTBLSIZE; i++) { |
|
|
while(env->symbols[i]!= NULL) { |
|
|
forget_sym(&(env->symbols[i])); |
|
|
} |
|
|
env->symbols[i]= NULL; |
|
|
} |
|
|
exit(EXIT_SUCCESS); |
|
708 |
} |
} |
709 |
|
|
|
/* Clear stack */ |
|
|
extern void clear(environment *env) |
|
|
{ |
|
|
while(env->head!=NULL) |
|
|
toss(env); |
|
|
} |
|
|
|
|
|
/* List all defined words */ |
|
|
extern void words(environment *env) |
|
|
{ |
|
|
symbol *temp; |
|
|
int i; |
|
|
|
|
|
for(i= 0; i<HASHTBLSIZE; i++) { |
|
|
temp= env->symbols[i]; |
|
|
while(temp!=NULL) { |
|
|
printf("%s\n", temp->id); |
|
|
temp= temp->next; |
|
|
} |
|
|
} |
|
|
} |
|
710 |
|
|
711 |
/* Internal forget function */ |
/* Internal forget function */ |
712 |
void forget_sym(symbol **hash_entry) { |
void forget_sym(symbol **hash_entry) |
713 |
|
{ |
714 |
symbol *temp; |
symbol *temp; |
715 |
|
|
716 |
temp= *hash_entry; |
temp= *hash_entry; |
717 |
*hash_entry= (*hash_entry)->next; |
*hash_entry= (*hash_entry)->next; |
718 |
|
|
|
if(temp->val!=NULL) { |
|
|
free_val(temp->val); |
|
|
} |
|
719 |
free(temp->id); |
free(temp->id); |
720 |
free(temp); |
free(temp); |
721 |
} |
} |
722 |
|
|
|
/* Forgets a symbol (remove it from the hash table) */ |
|
|
extern void forget(environment *env) |
|
|
{ |
|
|
char* sym_id; |
|
|
stackitem *stack_head= env->head; |
|
|
|
|
|
if(stack_head==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(stack_head->item->type!=symb) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
723 |
|
|
724 |
sym_id= ((symbol*)(stack_head->item->content.ptr))->id; |
int main(int argc, char **argv) |
725 |
toss(env); |
{ |
726 |
|
environment myenv; |
727 |
|
int c; /* getopt option character */ |
728 |
|
|
729 |
return forget_sym(hash(env->symbols, sym_id)); |
#ifdef __linux__ |
730 |
} |
mtrace(); |
731 |
|
#endif |
732 |
|
|
733 |
/* Returns the current error number to the stack */ |
init_env(&myenv); |
|
extern void errn(environment *env){ |
|
|
push_int(env, env->err); |
|
|
} |
|
734 |
|
|
735 |
extern void read(environment*); |
myenv.interactive = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO); |
736 |
|
|
737 |
int main() |
while ((c = getopt (argc, argv, "i")) != -1) |
738 |
{ |
switch (c) |
739 |
environment myenv; |
{ |
740 |
|
case 'i': |
741 |
|
myenv.interactive = 1; |
742 |
|
break; |
743 |
|
case '?': |
744 |
|
fprintf (stderr, |
745 |
|
"Unknown option character '\\x%x'.\n", |
746 |
|
optopt); |
747 |
|
return EX_USAGE; |
748 |
|
default: |
749 |
|
abort (); |
750 |
|
} |
751 |
|
|
752 |
|
if (optind < argc) { |
753 |
|
myenv.interactive = 0; |
754 |
|
myenv.inputstream= fopen(argv[optind], "r"); |
755 |
|
if(myenv.inputstream== NULL) { |
756 |
|
perror(argv[0]); |
757 |
|
exit (EX_NOINPUT); |
758 |
|
} |
759 |
|
} |
760 |
|
|
761 |
init_env(&myenv); |
if(myenv.interactive) |
762 |
|
printf(start_message); |
763 |
|
|
764 |
while(1) { |
while(1) { |
765 |
if(myenv.in_string==NULL) { |
if(myenv.in_string==NULL) { |
766 |
nl(); |
if (myenv.interactive) { |
767 |
printstack(&myenv); |
if(myenv.err) { |
768 |
printf("> "); |
printf("(error %d)\n", myenv.err); |
769 |
} |
myenv.err= 0; |
770 |
read(&myenv); |
} |
771 |
if(myenv.err) { |
printf("\n"); |
772 |
printf("(error %d) ", myenv.err); |
printstack(&myenv); |
773 |
|
printf("> "); |
774 |
|
} |
775 |
myenv.err=0; |
myenv.err=0; |
776 |
} else if(myenv.head!=NULL |
} |
777 |
&& myenv.head->item->type==symb |
readstream(&myenv, myenv.inputstream); |
778 |
&& ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') { |
if (myenv.err) { /* EOF or other error */ |
779 |
toss(&myenv); /* No error check in main */ |
myenv.err=0; |
780 |
|
quit(&myenv); |
781 |
|
} else if(myenv.head->type!=empty |
782 |
|
&& CAR(myenv.head)->type==symb |
783 |
|
&& CAR(myenv.head)->content.sym->id[0] == ';') { |
784 |
|
if(myenv.head->type != empty) |
785 |
|
myenv.head= CDR(myenv.head); |
786 |
eval(&myenv); |
eval(&myenv); |
787 |
|
} else { |
788 |
|
gc_maybe(&myenv); |
789 |
} |
} |
790 |
} |
} |
791 |
quit(&myenv); |
quit(&myenv); |
792 |
return EXIT_FAILURE; |
return EXIT_FAILURE; |
793 |
} |
} |
794 |
|
|
|
/* + */ |
|
|
extern void sx_2b(environment *env) { |
|
|
int a, b; |
|
|
size_t len; |
|
|
char* new_string; |
|
|
value *a_val, *b_val; |
|
|
|
|
|
if((env->head)==NULL || env->head->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->item->type==string |
|
|
&& env->head->next->item->type==string) { |
|
|
a_val= env->head->item; |
|
|
b_val= env->head->next->item; |
|
|
a_val->refcount++; |
|
|
b_val->refcount++; |
|
|
toss(env); if(env->err) return; |
|
|
toss(env); if(env->err) return; |
|
|
len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1; |
|
|
new_string= malloc(len); |
|
|
strcpy(new_string, b_val->content.ptr); |
|
|
strcat(new_string, a_val->content.ptr); |
|
|
free_val(a_val); free_val(b_val); |
|
|
push_cstring(env, new_string); |
|
|
free(new_string); |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->item->type!=integer |
|
|
|| env->head->next->item->type!=integer) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
|
a=env->head->item->content.val; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
if(env->head->item->refcount == 1) |
|
|
env->head->item->content.val += a; |
|
|
else { |
|
|
b=env->head->item->content.val; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
push_int(env, a+b); |
|
|
} |
|
|
} |
|
|
|
|
|
/* - */ |
|
|
extern void sx_2d(environment *env) { |
|
|
int a, b; |
|
|
|
|
|
if((env->head)==NULL || env->head->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->item->type!=integer |
|
|
|| env->head->next->item->type!=integer) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
|
a=env->head->item->content.val; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
if(env->head->item->refcount == 1) |
|
|
env->head->item->content.val -= a; |
|
|
else { |
|
|
b=env->head->item->content.val; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
push_int(env, b-a); |
|
|
} |
|
|
} |
|
|
|
|
|
/* > */ |
|
|
extern void sx_3e(environment *env) { |
|
|
int a, b; |
|
|
|
|
|
if((env->head)==NULL || env->head->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->item->type!=integer |
|
|
|| env->head->next->item->type!=integer) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
|
a=env->head->item->content.val; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
if(env->head->item->refcount == 1) |
|
|
env->head->item->content.val = (env->head->item->content.val > a); |
|
|
else { |
|
|
b=env->head->item->content.val; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
push_int(env, b>a); |
|
|
} |
|
|
} |
|
795 |
|
|
796 |
/* Return copy of a value */ |
/* Return copy of a value */ |
797 |
value *copy_val(value *old_value){ |
value *copy_val(environment *env, value *old_value) |
798 |
stackitem *old_item, *new_item, *prev_item; |
{ |
799 |
|
value *new_value; |
800 |
|
|
801 |
|
if(old_value==NULL) |
802 |
|
return NULL; |
803 |
|
|
804 |
value *new_value=malloc(sizeof(value)); |
new_value= new_val(env); |
805 |
|
new_value->type= old_value->type; |
806 |
|
|
|
new_value->type=old_value->type; |
|
|
new_value->refcount=0; /* This is increased if/when this |
|
|
value is referenced somewhere, like |
|
|
in a stack item or a variable */ |
|
807 |
switch(old_value->type){ |
switch(old_value->type){ |
808 |
|
case tfloat: |
809 |
case integer: |
case integer: |
|
new_value->content.val=old_value->content.val; |
|
|
break; |
|
|
case string: |
|
|
(char *)(new_value->content.ptr) |
|
|
= strdup((char *)(old_value->content.ptr)); |
|
|
break; |
|
810 |
case func: |
case func: |
811 |
case symb: |
case symb: |
812 |
new_value->content.ptr=old_value->content.ptr; |
case empty: |
813 |
|
case unknown: |
814 |
|
case port: |
815 |
|
new_value->content= old_value->content; |
816 |
|
break; |
817 |
|
case string: |
818 |
|
new_value->content.string= strdup(old_value->content.string); |
819 |
break; |
break; |
820 |
case list: |
case tcons: |
|
new_value->content.ptr=NULL; |
|
821 |
|
|
822 |
prev_item=NULL; |
new_value->content.c= malloc(sizeof(pair)); |
823 |
old_item=(stackitem *)(old_value->content.ptr); |
assert(new_value->content.c!=NULL); |
824 |
|
env->gc_count += sizeof(pair); |
825 |
|
|
826 |
while(old_item != NULL) { /* While list is not empty */ |
CAR(new_value)= copy_val(env, CAR(old_value)); /* recurse */ |
827 |
new_item= malloc(sizeof(stackitem)); |
CDR(new_value)= copy_val(env, CDR(old_value)); /* recurse */ |
|
new_item->item=copy_val(old_item->item); /* recurse */ |
|
|
new_item->next=NULL; |
|
|
if(prev_item != NULL) /* If this wasn't the first item */ |
|
|
prev_item->next=new_item; /* point the previous item to the |
|
|
new item */ |
|
|
else |
|
|
new_value->content.ptr=new_item; |
|
|
old_item=old_item->next; |
|
|
prev_item=new_item; |
|
|
} |
|
828 |
break; |
break; |
829 |
} |
} |
|
return new_value; |
|
|
} |
|
830 |
|
|
831 |
/* duplicates an item on the stack */ |
return new_value; |
|
extern void dup(environment *env) { |
|
|
if((env->head)==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
push_val(env, copy_val(env->head->item)); |
|
832 |
} |
} |
833 |
|
|
|
/* "if", If-Then */ |
|
|
extern void sx_6966(environment *env) { |
|
|
|
|
|
int truth; |
|
834 |
|
|
835 |
if((env->head)==NULL || env->head->next==NULL) { |
/* read a line from a stream; used by readline */ |
836 |
printerr("Too Few Arguments"); |
void readlinestream(environment *env, FILE *stream) |
837 |
env->err=1; |
{ |
838 |
return; |
char in_string[101]; |
|
} |
|
839 |
|
|
840 |
if(env->head->next->item->type != integer) { |
if(fgets(in_string, 100, stream)==NULL) { |
841 |
printerr("Bad Argument Type"); |
push_cstring(env, ""); |
842 |
env->err=2; |
if (! feof(stream)){ |
843 |
return; |
perror("readline"); |
844 |
|
env->err= 5; |
845 |
|
} |
846 |
|
} else { |
847 |
|
push_cstring(env, in_string); |
848 |
} |
} |
|
|
|
|
swap(env); |
|
|
if(env->err) return; |
|
|
|
|
|
truth=env->head->item->content.val; |
|
|
|
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
|
|
|
if(truth) |
|
|
eval(env); |
|
|
else |
|
|
toss(env); |
|
849 |
} |
} |
850 |
|
|
|
/* If-Then-Else */ |
|
|
extern void ifelse(environment *env) { |
|
851 |
|
|
852 |
int truth; |
/* Reverse (flip) a list */ |
853 |
|
extern void rev(environment *env) |
854 |
if((env->head)==NULL || env->head->next==NULL |
{ |
855 |
|| env->head->next->next==NULL) { |
value *old_head, *new_head, *item; |
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
856 |
|
|
857 |
if(env->head->next->next->item->type != integer) { |
if(env->head->type==empty) { |
858 |
printerr("Bad Argument Type"); |
printerr(env, "Too Few Arguments"); |
859 |
env->err=2; |
env->err= 1; |
860 |
return; |
return; |
861 |
} |
} |
|
|
|
|
rot(env); |
|
|
if(env->err) return; |
|
|
|
|
|
truth=env->head->item->content.val; |
|
|
|
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
|
|
|
if(!truth) |
|
|
swap(env); |
|
|
if(env->err) return; |
|
|
|
|
|
toss(env); |
|
|
if(env->err) return; |
|
862 |
|
|
863 |
eval(env); |
if(CAR(env->head)->type==empty) |
864 |
} |
return; /* Don't reverse an empty list */ |
865 |
|
|
866 |
/* while */ |
if(CAR(env->head)->type!=tcons) { |
867 |
extern void sx_7768696c65(environment *env) { |
printerr(env, "Bad Argument Type"); |
868 |
|
env->err= 2; |
|
int truth; |
|
|
value *loop, *test; |
|
|
|
|
|
if((env->head)==NULL || env->head->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
869 |
return; |
return; |
870 |
} |
} |
871 |
|
|
872 |
loop= env->head->item; |
old_head= CAR(env->head); |
873 |
loop->refcount++; |
new_head= new_val(env); |
874 |
toss(env); if(env->err) return; |
while(old_head->type != empty) { |
875 |
|
item= old_head; |
876 |
test= env->head->item; |
old_head= CDR(old_head); |
877 |
test->refcount++; |
CDR(item)= new_head; |
878 |
toss(env); if(env->err) return; |
new_head= item; |
|
|
|
|
do { |
|
|
push_val(env, test); |
|
|
eval(env); |
|
|
|
|
|
if(env->head->item->type != integer) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
|
|
|
|
truth= env->head->item->content.val; |
|
|
toss(env); if(env->err) return; |
|
|
|
|
|
if(truth) { |
|
|
push_val(env, loop); |
|
|
eval(env); |
|
|
} else { |
|
|
toss(env); |
|
|
} |
|
|
|
|
|
} while(truth); |
|
|
|
|
|
free_val(test); |
|
|
free_val(loop); |
|
|
} |
|
|
|
|
|
/* For-loop */ |
|
|
extern void sx_666f72(environment *env) { |
|
|
|
|
|
value *loop, *foo; |
|
|
stackitem *iterator; |
|
|
|
|
|
if((env->head)==NULL || env->head->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->next->item->type != list) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
879 |
} |
} |
880 |
|
CAR(env->head)= new_head; |
881 |
|
} |
882 |
|
|
|
loop= env->head->item; |
|
|
loop->refcount++; |
|
|
toss(env); if(env->err) return; |
|
|
|
|
|
foo= env->head->item; |
|
|
foo->refcount++; |
|
|
toss(env); if(env->err) return; |
|
|
|
|
|
iterator= foo->content.ptr; |
|
883 |
|
|
884 |
while(iterator!=NULL) { |
/* Make a list. */ |
885 |
push_val(env, iterator->item); |
extern void pack(environment *env) |
886 |
push_val(env, loop); |
{ |
887 |
eval(env); if(env->err) return; |
value *iterator, *temp, *ending; |
|
iterator= iterator->next; |
|
|
} |
|
888 |
|
|
889 |
free_val(loop); |
ending=new_val(env); |
|
free_val(foo); |
|
|
} |
|
890 |
|
|
891 |
/* 'to' */ |
iterator= env->head; |
892 |
extern void to(environment *env) { |
if(iterator->type == empty |
893 |
int i, start, ending; |
|| (CAR(iterator)->type==symb |
894 |
stackitem *temp_head; |
&& CAR(iterator)->content.sym->id[0]=='[')) { |
895 |
value *temp_val; |
temp= ending; |
896 |
|
if(env->head->type != empty) |
897 |
if((env->head)==NULL || env->head->next==NULL) { |
env->head= CDR(env->head); |
898 |
printerr("Too Few Arguments"); |
} else { |
899 |
env->err=1; |
/* Search for first delimiter */ |
900 |
return; |
while(CDR(iterator)->type != empty |
901 |
} |
&& (CAR(CDR(iterator))->type!=symb |
902 |
|
|| CAR(CDR(iterator))->content.sym->id[0]!='[')) |
903 |
|
iterator= CDR(iterator); |
904 |
|
|
905 |
|
/* Extract list */ |
906 |
|
temp= env->head; |
907 |
|
env->head= CDR(iterator); |
908 |
|
CDR(iterator)= ending; |
909 |
|
|
910 |
if(env->head->item->type!=integer |
if(env->head->type != empty) |
911 |
|| env->head->next->item->type!=integer) { |
env->head= CDR(env->head); |
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
912 |
} |
} |
913 |
|
|
914 |
ending= env->head->item->content.val; |
/* Push list */ |
|
toss(env); if(env->err) return; |
|
|
start= env->head->item->content.val; |
|
|
toss(env); if(env->err) return; |
|
|
|
|
|
temp_head= env->head; |
|
|
env->head= NULL; |
|
|
|
|
|
if(ending>=start) { |
|
|
for(i= ending; i>=start; i--) |
|
|
push_int(env, i); |
|
|
} else { |
|
|
for(i= ending; i<=start; i++) |
|
|
push_int(env, i); |
|
|
} |
|
915 |
|
|
916 |
temp_val= malloc(sizeof(value)); |
push_val(env, temp); |
917 |
temp_val->content.ptr= env->head; |
rev(env); |
|
temp_val->refcount= 1; |
|
|
temp_val->type= list; |
|
|
env->head= temp_head; |
|
|
push_val(env, temp_val); |
|
918 |
} |
} |
919 |
|
|
|
/* Read a string */ |
|
|
extern void readline(environment *env) { |
|
|
char in_string[101]; |
|
|
|
|
|
fgets(in_string, 100, stdin); |
|
|
push_cstring(env, in_string); |
|
|
} |
|
920 |
|
|
921 |
/* Read a value and place on stack */ |
/* read from a stream; used by "read" and "readport" */ |
922 |
extern void read(environment *env) { |
void readstream(environment *env, FILE *stream) |
923 |
|
{ |
924 |
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n"; |
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n"; |
925 |
const char strform[]= "\"%[^\"]\"%n"; |
const char strform[]= "\"%[^\"]\"%n"; |
926 |
const char intform[]= "%i%n"; |
const char intform[]= "%i%n"; |
927 |
|
const char fltform[]= "%f%n"; |
928 |
const char blankform[]= "%*[ \t]%n"; |
const char blankform[]= "%*[ \t]%n"; |
929 |
const char ebrackform[]= "%*1[]]%n"; |
const char ebrackform[]= "]%n"; |
930 |
const char semicform[]= "%*1[;]%n"; |
const char semicform[]= ";%n"; |
931 |
const char bbrackform[]= "%*1[[]%n"; |
const char bbrackform[]= "[%n"; |
932 |
|
|
933 |
int itemp, readlength= -1; |
int itemp, readlength= -1; |
934 |
|
int count= -1; |
935 |
|
float ftemp; |
936 |
static int depth= 0; |
static int depth= 0; |
937 |
char *rest, *match; |
char *match; |
938 |
size_t inlength; |
size_t inlength; |
939 |
|
|
940 |
if(env->in_string==NULL) { |
if(env->in_string==NULL) { |
941 |
if(depth > 0) { |
if(depth > 0 && env->interactive) { |
942 |
printf("]> "); |
printf("]> "); |
943 |
} |
} |
944 |
readline(env); if(env->err) return; |
readlinestream(env, env->inputstream); |
945 |
|
if(env->err) return; |
946 |
|
|
947 |
|
if((CAR(env->head)->content.string)[0]=='\0'){ |
948 |
|
env->err= 4; /* "" means EOF */ |
949 |
|
return; |
950 |
|
} |
951 |
|
|
952 |
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
env->in_string= malloc(strlen(CAR(env->head)->content.string)+1); |
953 |
|
assert(env->in_string != NULL); |
954 |
env->free_string= env->in_string; /* Save the original pointer */ |
env->free_string= env->in_string; /* Save the original pointer */ |
955 |
strcpy(env->in_string, env->head->item->content.ptr); |
strcpy(env->in_string, CAR(env->head)->content.string); |
956 |
toss(env); if(env->err) return; |
env->head= CDR(env->head); |
957 |
} |
} |
958 |
|
|
959 |
inlength= strlen(env->in_string)+1; |
inlength= strlen(env->in_string)+1; |
960 |
match= malloc(inlength); |
match= malloc(inlength); |
961 |
rest= malloc(inlength); |
assert(match != NULL); |
962 |
|
|
963 |
if(sscanf(env->in_string, blankform, &readlength)!=EOF |
if(sscanf(env->in_string, blankform, &readlength) != EOF |
964 |
&& readlength != -1) { |
&& readlength != -1) { |
965 |
; |
; |
966 |
} else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF |
} else if(sscanf(env->in_string, fltform, &ftemp, &readlength) != EOF |
967 |
|
&& readlength != -1) { |
968 |
|
if(sscanf(env->in_string, intform, &itemp, &count) != EOF |
969 |
|
&& count==readlength) { |
970 |
|
push_int(env, itemp); |
971 |
|
} else { |
972 |
|
push_float(env, ftemp); |
973 |
|
} |
974 |
|
} else if(sscanf(env->in_string, "\"\"%n", &readlength) != EOF |
975 |
&& readlength != -1) { |
&& readlength != -1) { |
976 |
push_int(env, itemp); |
push_cstring(env, ""); |
977 |
} else if(sscanf(env->in_string, strform, match, &readlength) != EOF |
} else if(sscanf(env->in_string, strform, match, &readlength) != EOF |
978 |
&& readlength != -1) { |
&& readlength != -1) { |
979 |
push_cstring(env, match); |
push_cstring(env, match); |
994 |
} else { |
} else { |
995 |
free(env->free_string); |
free(env->free_string); |
996 |
env->in_string = env->free_string = NULL; |
env->in_string = env->free_string = NULL; |
|
free(match); |
|
997 |
} |
} |
998 |
if ( env->in_string != NULL) { |
if (env->in_string != NULL) { |
999 |
env->in_string += readlength; |
env->in_string += readlength; |
1000 |
} |
} |
1001 |
|
|
1002 |
|
free(match); |
1003 |
|
|
1004 |
if(depth) |
if(depth) |
1005 |
return read(env); |
return readstream(env, env->inputstream); |
1006 |
|
} |
1007 |
|
|
1008 |
|
|
1009 |
|
int check_args(environment *env, ...) |
1010 |
|
{ |
1011 |
|
va_list ap; |
1012 |
|
enum type_enum mytype; |
1013 |
|
|
1014 |
|
value *iter= env->head; |
1015 |
|
int errval= 0; |
1016 |
|
|
1017 |
|
va_start(ap, env); |
1018 |
|
while(1) { |
1019 |
|
mytype= va_arg(ap, enum type_enum); |
1020 |
|
// fprintf(stderr, "%s\n", env->errsymb); |
1021 |
|
|
1022 |
|
if(mytype==empty) |
1023 |
|
break; |
1024 |
|
|
1025 |
|
if(iter->type==empty || iter==NULL) { |
1026 |
|
errval= 1; |
1027 |
|
break; |
1028 |
|
} |
1029 |
|
|
1030 |
|
if(mytype==unknown) { |
1031 |
|
iter=CDR(iter); |
1032 |
|
continue; |
1033 |
|
} |
1034 |
|
|
1035 |
|
if(CAR(iter)->type!=mytype) { |
1036 |
|
errval= 2; |
1037 |
|
break; |
1038 |
|
} |
1039 |
|
|
1040 |
|
iter= CDR(iter); |
1041 |
|
} |
1042 |
|
|
1043 |
|
va_end(ap); |
1044 |
|
|
1045 |
|
env->err= errval; |
1046 |
|
return errval; |
1047 |
} |
} |