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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 |
7 |
/* 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 65536 |
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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int non_eval_flag; |
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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->err= 0; |
env->gc_limit= 400000; |
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env->non_eval_flag= 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; |
50 |
} |
} |
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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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free(val); /* Free the actual list value */ |
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break; |
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case integer: |
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case func: |
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case symb: |
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break; |
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} |
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} |
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} |
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/* Discard the top element of the stack. */ |
void printerr(environment *env) |
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extern void toss(environment *env) |
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{ |
{ |
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stackitem *temp= env->head; |
char *in_string; |
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if((env->head)==NULL) { |
switch(env->err) { |
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printerr("Too Few Arguments"); |
case 0: |
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env->err=1; |
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return; |
return; |
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case 1: |
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in_string= "Too Few Arguments"; |
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break; |
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case 2: |
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in_string= "Bad Argument Type"; |
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break; |
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case 3: |
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in_string= "Unbound Variable"; |
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break; |
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default: |
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in_string= "Unknown error"; |
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break; |
72 |
} |
} |
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free_val(env->head->item); /* Free the value */ |
fprintf(stderr, "\"%s\":\nErr: %s\n", env->errsymb, in_string); |
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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) |
80 |
{ |
{ |
104 |
} |
} |
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} |
} |
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/* Generic push function. */ |
|
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void push(stackitem** stack_head, stackitem* in_item) |
/* Create new value */ |
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value* new_val(environment *env) |
110 |
{ |
{ |
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in_item->next= *stack_head; |
value *nval= malloc(sizeof(value)); |
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*stack_head= in_item; |
stackitem *nitem= malloc(sizeof(stackitem)); |
113 |
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114 |
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assert(nval != NULL); |
115 |
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assert(nitem != NULL); |
116 |
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117 |
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nval->content.ptr= NULL; |
118 |
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nval->type= empty; |
119 |
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120 |
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nitem->item= nval; |
121 |
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nitem->next= env->gc_ref; |
122 |
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123 |
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env->gc_ref= nitem; |
124 |
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125 |
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env->gc_count += sizeof(value); |
126 |
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nval->gc.flag.mark= 0; |
127 |
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nval->gc.flag.protect= 0; |
128 |
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129 |
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return nval; |
130 |
} |
} |
131 |
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132 |
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133 |
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/* Mark values recursively. |
134 |
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Marked values are not collected by the GC. */ |
135 |
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inline void gc_mark(value *val) |
136 |
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{ |
137 |
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if(val==NULL || val->gc.flag.mark) |
138 |
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return; |
139 |
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val->gc.flag.mark= 1; |
141 |
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142 |
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if(val->type==tcons) { |
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gc_mark(CAR(val)); |
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gc_mark(CDR(val)); |
145 |
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} |
146 |
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} |
147 |
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148 |
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149 |
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/* Start GC */ |
150 |
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extern void gc_init(environment *env) |
151 |
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{ |
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stackitem *new_head= NULL, *titem; |
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symbol *tsymb; |
154 |
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int i; |
155 |
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156 |
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if(env->interactive) |
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printf("Garbage collecting."); |
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159 |
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/* Mark values on stack */ |
160 |
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gc_mark(env->head); |
161 |
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162 |
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if(env->interactive) |
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printf("."); |
164 |
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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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171 |
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if(env->interactive) |
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printf("."); |
173 |
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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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179 |
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/* Remove content */ |
180 |
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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); |
186 |
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break; |
187 |
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case port: |
188 |
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case empty: |
189 |
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case unknown: |
190 |
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case integer: |
191 |
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case tfloat: |
192 |
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case func: |
193 |
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case symb: |
194 |
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/* Symbol strings are freed when walking the hash table */ |
195 |
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break; |
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} |
197 |
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198 |
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free(env->gc_ref->item); /* Remove from gc_ref */ |
199 |
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titem= env->gc_ref->next; |
200 |
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free(env->gc_ref); /* Remove value */ |
201 |
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env->gc_ref= titem; |
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continue; |
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} |
204 |
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205 |
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#ifdef DEBUG |
206 |
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printf("Kept value (%p)", env->gc_ref->item); |
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if(env->gc_ref->item->gc.flag.mark) |
208 |
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printf(" (marked)"); |
209 |
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if(env->gc_ref->item->gc.flag.protect) |
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printf(" (protected)"); |
211 |
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switch(env->gc_ref->item->type){ |
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case integer: |
213 |
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printf(" integer: %d", env->gc_ref->item->content.i); |
214 |
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break; |
215 |
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case func: |
216 |
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printf(" func: %p", env->gc_ref->item->content.func); |
217 |
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break; |
218 |
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case symb: |
219 |
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printf(" symb: %s", env->gc_ref->item->content.sym->id); |
220 |
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break; |
221 |
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case tcons: |
222 |
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printf(" tcons: %p\t%p", CAR(env->gc_ref->item), |
223 |
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CDR(env->gc_ref->item)); |
224 |
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break; |
225 |
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default: |
226 |
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printf(" <unknown %d>", (env->gc_ref->item->type)); |
227 |
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} |
228 |
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printf("\n"); |
229 |
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#endif /* DEBUG */ |
230 |
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231 |
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/* Keep values */ |
232 |
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env->gc_count += sizeof(value); |
233 |
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if(env->gc_ref->item->type==string) |
234 |
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env->gc_count += strlen(env->gc_ref->item->content.string)+1; |
235 |
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236 |
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titem= env->gc_ref->next; |
237 |
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env->gc_ref->next= new_head; |
238 |
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new_head= env->gc_ref; |
239 |
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new_head->item->gc.flag.mark= 0; |
240 |
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env->gc_ref= titem; |
241 |
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} |
242 |
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243 |
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if (env->gc_limit < env->gc_count*2) |
244 |
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env->gc_limit= env->gc_count*2; |
245 |
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246 |
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env->gc_ref= new_head; |
247 |
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248 |
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if(env->interactive) |
249 |
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printf("done (%d bytes still allocated)\n", env->gc_count); |
250 |
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251 |
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} |
252 |
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253 |
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254 |
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inline void gc_maybe(environment *env) |
255 |
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{ |
256 |
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if(env->gc_count < env->gc_limit) |
257 |
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return; |
258 |
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else |
259 |
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return gc_init(env); |
260 |
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} |
261 |
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262 |
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263 |
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/* Protect values from GC */ |
264 |
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void protect(value *val) |
265 |
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{ |
266 |
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if(val==NULL || val->gc.flag.protect) |
267 |
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return; |
268 |
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269 |
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val->gc.flag.protect= 1; |
270 |
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|
271 |
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if(val->type==tcons) { |
272 |
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protect(CAR(val)); |
273 |
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protect(CDR(val)); |
274 |
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} |
275 |
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} |
276 |
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277 |
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278 |
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/* Unprotect values from GC */ |
279 |
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void unprotect(value *val) |
280 |
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{ |
281 |
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if(val==NULL || !(val->gc.flag.protect)) |
282 |
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return; |
283 |
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284 |
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val->gc.flag.protect= 0; |
285 |
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286 |
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if(val->type==tcons) { |
287 |
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unprotect(CAR(val)); |
288 |
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unprotect(CDR(val)); |
289 |
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} |
290 |
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} |
291 |
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292 |
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293 |
/* Push a value onto the stack */ |
/* Push a value onto the stack */ |
294 |
void push_val(stackitem **stack_head, value *val) |
void push_val(environment *env, value *val) |
295 |
{ |
{ |
296 |
stackitem *new_item= malloc(sizeof(stackitem)); |
value *new_value= new_val(env); |
297 |
new_item->item= val; |
|
298 |
val->refcount++; |
new_value->content.c= malloc(sizeof(pair)); |
299 |
push(stack_head, new_item); |
assert(new_value->content.c!=NULL); |
300 |
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env->gc_count += sizeof(pair); |
301 |
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new_value->type= tcons; |
302 |
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CAR(new_value)= val; |
303 |
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CDR(new_value)= env->head; |
304 |
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env->head= new_value; |
305 |
} |
} |
306 |
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307 |
/* Push an integer onto the stack. */ |
|
308 |
void push_int(stackitem **stack_head, int in_val) |
/* Push an integer onto the stack */ |
309 |
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void push_int(environment *env, int in_val) |
310 |
{ |
{ |
311 |
value *new_value= malloc(sizeof(value)); |
value *new_value= new_val(env); |
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stackitem *new_item= malloc(sizeof(stackitem)); |
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new_item->item= new_value; |
|
312 |
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313 |
new_value->content.val= in_val; |
new_value->content.i= in_val; |
314 |
new_value->type= integer; |
new_value->type= integer; |
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new_value->refcount=1; |
|
315 |
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|
316 |
push(stack_head, new_item); |
push_val(env, new_value); |
317 |
} |
} |
318 |
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319 |
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320 |
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/* Push a floating point number onto the stack */ |
321 |
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void push_float(environment *env, float in_val) |
322 |
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{ |
323 |
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value *new_value= new_val(env); |
324 |
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325 |
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new_value->content.f= in_val; |
326 |
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new_value->type= tfloat; |
327 |
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328 |
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push_val(env, new_value); |
329 |
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} |
330 |
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331 |
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332 |
/* Copy a string onto the stack. */ |
/* Copy a string onto the stack. */ |
333 |
void push_cstring(stackitem **stack_head, const char *in_string) |
void push_cstring(environment *env, const char *in_string) |
334 |
{ |
{ |
335 |
value *new_value= malloc(sizeof(value)); |
value *new_value= new_val(env); |
336 |
stackitem *new_item= malloc(sizeof(stackitem)); |
int length= strlen(in_string)+1; |
|
new_item->item=new_value; |
|
337 |
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|
338 |
new_value->content.ptr= malloc(strlen(in_string)+1); |
new_value->content.string= malloc(length); |
339 |
strcpy(new_value->content.ptr, in_string); |
assert(new_value != NULL); |
340 |
|
env->gc_count += length; |
341 |
|
strcpy(new_value->content.string, in_string); |
342 |
new_value->type= string; |
new_value->type= string; |
|
new_value->refcount=1; |
|
343 |
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|
344 |
push(stack_head, new_item); |
push_val(env, new_value); |
345 |
} |
} |
346 |
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347 |
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|
348 |
/* Mangle a symbol name to a valid C identifier name */ |
/* Mangle a symbol name to a valid C identifier name */ |
349 |
char *mangle_str(const char *old_string){ |
char *mangle_str(const char *old_string) |
350 |
char validchars[] |
{ |
351 |
="0123456789abcdef"; |
char validchars[]= "0123456789abcdef"; |
352 |
char *new_string, *current; |
char *new_string, *current; |
353 |
|
|
354 |
new_string=malloc((strlen(old_string)*2)+4); |
new_string= malloc((strlen(old_string)*2)+4); |
355 |
|
assert(new_string != NULL); |
356 |
strcpy(new_string, "sx_"); /* Stack eXternal */ |
strcpy(new_string, "sx_"); /* Stack eXternal */ |
357 |
current=new_string+3; |
current= new_string+3; |
358 |
|
|
359 |
while(old_string[0] != '\0'){ |
while(old_string[0] != '\0'){ |
360 |
current[0]=validchars[(unsigned char)(old_string[0])/16]; |
current[0]= validchars[(unsigned char)(old_string[0])/16]; |
361 |
current[1]=validchars[(unsigned char)(old_string[0])%16]; |
current[1]= validchars[(unsigned char)(old_string[0])%16]; |
362 |
current+=2; |
current+= 2; |
363 |
old_string++; |
old_string++; |
364 |
} |
} |
365 |
current[0]='\0'; |
current[0]= '\0'; |
366 |
|
|
367 |
return new_string; /* The caller must free() it */ |
return new_string; /* The caller must free() it */ |
368 |
} |
} |
369 |
|
|
|
extern void mangle(environment *env){ |
|
|
value *new_value; |
|
|
char *new_string; |
|
|
|
|
|
if((env->head)==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->item->type!=string) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
|
|
|
|
new_string= mangle_str((const char *)(env->head->item->content.ptr)); |
|
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|
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
|
|
|
new_value= malloc(sizeof(value)); |
|
|
new_value->content.ptr= new_string; |
|
|
new_value->type= string; |
|
|
new_value->refcount=1; |
|
|
|
|
|
push_val(&(env->head), new_value); |
|
|
} |
|
370 |
|
|
371 |
/* Push a symbol onto the stack. */ |
/* Push a symbol onto the stack. */ |
372 |
void push_sym(environment *env, const char *in_string) |
void push_sym(environment *env, const char *in_string) |
373 |
{ |
{ |
|
stackitem *new_item; /* The new stack item */ |
|
|
/* ...which will contain... */ |
|
374 |
value *new_value; /* A new symbol value */ |
value *new_value; /* A new symbol value */ |
375 |
/* ...which might point to... */ |
/* ...which might point to... */ |
376 |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
383 |
const char *dlerr; /* Dynamic linker error */ |
const char *dlerr; /* Dynamic linker error */ |
384 |
char *mangled; /* Mangled function name */ |
char *mangled; /* Mangled function name */ |
385 |
|
|
386 |
/* Create a new stack item containing a new value */ |
new_value= new_val(env); |
387 |
new_item= malloc(sizeof(stackitem)); |
new_fvalue= new_val(env); |
|
new_value= malloc(sizeof(value)); |
|
|
new_item->item=new_value; |
|
388 |
|
|
389 |
/* The new value is a symbol */ |
/* The new value is a symbol */ |
390 |
new_value->type= symb; |
new_value->type= symb; |
|
new_value->refcount= 1; |
|
391 |
|
|
392 |
/* Look up the symbol name in the hash table */ |
/* Look up the symbol name in the hash table */ |
393 |
new_symbol= hash(env->symbols, in_string); |
new_symbol= hash(env->symbols, in_string); |
394 |
new_value->content.ptr= *new_symbol; |
new_value->content.sym= *new_symbol; |
395 |
|
|
396 |
if(*new_symbol==NULL) { /* If symbol was undefined */ |
if(*new_symbol==NULL) { /* If symbol was undefined */ |
397 |
|
|
398 |
/* Create a new symbol */ |
/* Create a new symbol */ |
399 |
(*new_symbol)= malloc(sizeof(symbol)); |
(*new_symbol)= malloc(sizeof(symbol)); |
400 |
|
assert((*new_symbol) != NULL); |
401 |
(*new_symbol)->val= NULL; /* undefined value */ |
(*new_symbol)->val= NULL; /* undefined value */ |
402 |
(*new_symbol)->next= NULL; |
(*new_symbol)->next= NULL; |
403 |
(*new_symbol)->id= malloc(strlen(in_string)+1); |
(*new_symbol)->id= malloc(strlen(in_string)+1); |
404 |
|
assert((*new_symbol)->id != NULL); |
405 |
strcpy((*new_symbol)->id, in_string); |
strcpy((*new_symbol)->id, in_string); |
406 |
|
|
407 |
/* Intern the new symbol in the hash table */ |
/* Intern the new symbol in the hash table */ |
408 |
new_value->content.ptr= *new_symbol; |
new_value->content.sym= *new_symbol; |
409 |
|
|
410 |
/* 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 |
411 |
we should bind the symbol to a new function pointer value */ |
we should bind the symbol to a new function pointer value */ |
412 |
if(handle==NULL) /* If no handle */ |
if(handle==NULL) /* If no handle */ |
413 |
handle= dlopen(NULL, RTLD_LAZY); |
handle= dlopen(NULL, RTLD_LAZY); |
414 |
|
|
415 |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
mangled= mangle_str(in_string); /* mangle the name */ |
416 |
dlerr=dlerror(); |
funcptr= dlsym(handle, mangled); /* and try to find it */ |
417 |
|
|
418 |
|
dlerr= dlerror(); |
419 |
if(dlerr != NULL) { /* If no function was found */ |
if(dlerr != NULL) { /* If no function was found */ |
420 |
mangled=mangle_str(in_string); |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
421 |
funcptr= dlsym(handle, mangled); /* try mangling it */ |
dlerr= dlerror(); |
|
free(mangled); |
|
|
dlerr=dlerror(); |
|
422 |
} |
} |
423 |
|
|
424 |
if(dlerr==NULL) { /* If a function was found */ |
if(dlerr==NULL) { /* If a function was found */ |
425 |
new_fvalue= malloc(sizeof(value)); /* Create a new value */ |
new_fvalue->type= func; /* The new value is a function pointer */ |
426 |
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 */ |
|
427 |
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
428 |
function value */ |
function value */ |
|
new_fvalue->refcount= 1; |
|
429 |
} |
} |
430 |
|
|
431 |
|
free(mangled); |
432 |
} |
} |
|
push(&(env->head), new_item); |
|
|
} |
|
433 |
|
|
434 |
/* Print newline. */ |
push_val(env, new_value); |
|
extern void nl() |
|
|
{ |
|
|
printf("\n"); |
|
435 |
} |
} |
436 |
|
|
|
/* Gets the type of a value */ |
|
|
extern void type(environment *env){ |
|
|
int typenum; |
|
437 |
|
|
438 |
if((env->head)==NULL) { |
/* Print a value */ |
439 |
printerr("Too Few Arguments"); |
void print_val(environment *env, value *val, int noquote, stackitem *stack, |
440 |
env->err=1; |
FILE *stream) |
441 |
return; |
{ |
442 |
} |
stackitem *titem, *tstack; |
443 |
typenum=env->head->item->type; |
int depth; |
444 |
toss(env); |
|
445 |
switch(typenum){ |
switch(val->type) { |
446 |
case integer: |
case empty: |
447 |
push_sym(env, "integer"); |
if(fprintf(stream, "[]") < 0){ |
448 |
break; |
perror("print_val"); |
449 |
case string: |
env->err= 5; |
450 |
push_sym(env, "string"); |
return; |
451 |
break; |
} |
|
case symb: |
|
|
push_sym(env, "symbol"); |
|
|
break; |
|
|
case func: |
|
|
push_sym(env, "function"); |
|
452 |
break; |
break; |
453 |
case list: |
case unknown: |
454 |
push_sym(env, "list"); |
if(fprintf(stream, "UNKNOWN") < 0){ |
455 |
|
perror("print_val"); |
456 |
|
env->err= 5; |
457 |
|
return; |
458 |
|
} |
459 |
break; |
break; |
|
} |
|
|
} |
|
|
|
|
|
/* Prints the top element of the stack. */ |
|
|
void print_h(stackitem *stack_head) |
|
|
{ |
|
|
switch(stack_head->item->type) { |
|
460 |
case integer: |
case integer: |
461 |
printf("%d", stack_head->item->content.val); |
if(fprintf(stream, "%d", val->content.i) < 0){ |
462 |
|
perror("print_val"); |
463 |
|
env->err= 5; |
464 |
|
return; |
465 |
|
} |
466 |
|
break; |
467 |
|
case tfloat: |
468 |
|
if(fprintf(stream, "%f", val->content.f) < 0){ |
469 |
|
perror("print_val"); |
470 |
|
env->err= 5; |
471 |
|
return; |
472 |
|
} |
473 |
break; |
break; |
474 |
case string: |
case string: |
475 |
printf("%s", (char*)stack_head->item->content.ptr); |
if(noquote){ |
476 |
|
if(fprintf(stream, "%s", val->content.string) < 0){ |
477 |
|
perror("print_val"); |
478 |
|
env->err= 5; |
479 |
|
return; |
480 |
|
} |
481 |
|
} else { /* quote */ |
482 |
|
if(fprintf(stream, "\"%s\"", val->content.string) < 0){ |
483 |
|
perror("print_val"); |
484 |
|
env->err= 5; |
485 |
|
return; |
486 |
|
} |
487 |
|
} |
488 |
break; |
break; |
489 |
case symb: |
case symb: |
490 |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
if(fprintf(stream, "%s", val->content.sym->id) < 0){ |
491 |
|
perror("print_val"); |
492 |
|
env->err= 5; |
493 |
|
return; |
494 |
|
} |
495 |
break; |
break; |
496 |
case func: |
case func: |
497 |
printf("#<function %p>", (funcp)(stack_head->item->content.ptr)); |
if(fprintf(stream, "#<function %p>", val->content.func) < 0){ |
498 |
|
perror("print_val"); |
499 |
|
env->err= 5; |
500 |
|
return; |
501 |
|
} |
502 |
break; |
break; |
503 |
case list: |
case port: |
504 |
/* A list is just a stack, so make stack_head point to it */ |
if(fprintf(stream, "#<port %p>", val->content.p) < 0){ |
505 |
stack_head=(stackitem *)(stack_head->item->content.ptr); |
perror("print_val"); |
506 |
printf("[ "); |
env->err= 5; |
507 |
while(stack_head != NULL) { |
return; |
|
print_h(stack_head); |
|
|
printf(" "); |
|
|
stack_head=stack_head->next; |
|
508 |
} |
} |
|
printf("]"); |
|
509 |
break; |
break; |
510 |
} |
case tcons: |
511 |
} |
if(fprintf(stream, "[ ") < 0){ |
512 |
|
perror("print_val"); |
513 |
|
env->err= 5; |
514 |
|
return; |
515 |
|
} |
516 |
|
tstack= stack; |
517 |
|
|
518 |
extern void print_(environment *env) { |
do { |
519 |
if(env->head==NULL) { |
titem=malloc(sizeof(stackitem)); |
520 |
printerr("Too Few Arguments"); |
assert(titem != NULL); |
521 |
env->err=1; |
titem->item=val; |
522 |
return; |
titem->next=tstack; |
523 |
} |
tstack=titem; /* Put it on the stack */ |
524 |
print_h(env->head); |
/* Search a stack of values being printed to see if we are already |
525 |
} |
printing this value */ |
526 |
|
titem=tstack; |
527 |
|
depth=0; |
528 |
|
|
529 |
|
while(titem != NULL && titem->item != CAR(val)){ |
530 |
|
titem=titem->next; |
531 |
|
depth++; |
532 |
|
} |
533 |
|
|
534 |
/* Prints the top element of the stack and then discards it. */ |
if(titem != NULL){ /* If we found it on the stack, */ |
535 |
extern void print(environment *env) |
if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */ |
536 |
{ |
perror("print_val"); |
537 |
print_(env); |
env->err= 5; |
538 |
if(env->err) return; |
free(titem); |
539 |
toss(env); |
return; |
540 |
} |
} |
541 |
|
} else { |
542 |
|
print_val(env, CAR(val), noquote, tstack, stream); |
543 |
|
} |
544 |
|
|
545 |
/* Only to be called by function printstack. */ |
val= CDR(val); |
546 |
void print_st(stackitem *stack_head, long counter) |
switch(val->type){ |
547 |
{ |
case empty: |
548 |
if(stack_head->next != NULL) |
break; |
549 |
print_st(stack_head->next, counter+1); |
case tcons: |
550 |
printf("%ld: ", counter); |
/* Search a stack of values being printed to see if we are already |
551 |
print_h(stack_head); |
printing this value */ |
552 |
nl(); |
titem=tstack; |
553 |
} |
depth=0; |
554 |
|
|
555 |
|
while(titem != NULL && titem->item != val){ |
556 |
|
titem=titem->next; |
557 |
|
depth++; |
558 |
|
} |
559 |
|
if(titem != NULL){ /* If we found it on the stack, */ |
560 |
|
if(fprintf(stream, " . #%d#", depth) < 0){ /* print a depth reference */ |
561 |
|
perror("print_val"); |
562 |
|
env->err= 5; |
563 |
|
goto printval_end; |
564 |
|
} |
565 |
|
} else { |
566 |
|
if(fprintf(stream, " ") < 0){ |
567 |
|
perror("print_val"); |
568 |
|
env->err= 5; |
569 |
|
goto printval_end; |
570 |
|
} |
571 |
|
} |
572 |
|
break; |
573 |
|
default: |
574 |
|
if(fprintf(stream, " . ") < 0){ /* Improper list */ |
575 |
|
perror("print_val"); |
576 |
|
env->err= 5; |
577 |
|
goto printval_end; |
578 |
|
} |
579 |
|
print_val(env, val, noquote, tstack, stream); |
580 |
|
} |
581 |
|
} while(val->type == tcons && titem == NULL); |
582 |
|
|
583 |
/* Prints the stack. */ |
printval_end: |
584 |
extern void printstack(environment *env) |
|
585 |
{ |
titem=tstack; |
586 |
if(env->head == NULL) { |
while(titem != stack){ |
587 |
return; |
tstack=titem->next; |
588 |
|
free(titem); |
589 |
|
titem=tstack; |
590 |
|
} |
591 |
|
|
592 |
|
if(! (env->err)){ |
593 |
|
if(fprintf(stream, " ]") < 0){ |
594 |
|
perror("print_val"); |
595 |
|
env->err= 5; |
596 |
|
} |
597 |
|
} |
598 |
|
break; |
599 |
} |
} |
|
print_st(env->head, 1); |
|
|
nl(); |
|
600 |
} |
} |
601 |
|
|
602 |
|
|
603 |
/* Swap the two top elements on the stack. */ |
/* Swap the two top elements on the stack. */ |
604 |
extern void swap(environment *env) |
extern void swap(environment *env) |
605 |
{ |
{ |
606 |
stackitem *temp= env->head; |
value *temp= env->head; |
|
|
|
|
if(env->head==NULL || env->head->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
env->head= env->head->next; |
|
|
temp->next= env->head->next; |
|
|
env->head->next= temp; |
|
|
} |
|
607 |
|
|
608 |
/* Rotate the first three elements on the stack. */ |
if(check_args(env, unknown, unknown, empty)) |
609 |
extern void rot(environment *env) |
return printerr(env); |
|
{ |
|
|
stackitem *temp= env->head; |
|
610 |
|
|
611 |
if(env->head==NULL || env->head->next==NULL |
env->head= CDR(env->head); |
612 |
|| env->head->next->next==NULL) { |
CDR(temp)= CDR(env->head); |
613 |
printerr("Too Few Arguments"); |
CDR(env->head)= temp; |
614 |
env->err=1; |
} |
|
return; |
|
|
} |
|
615 |
|
|
|
env->head= env->head->next->next; |
|
|
temp->next->next= env->head->next; |
|
|
env->head->next= temp; |
|
|
} |
|
616 |
|
|
617 |
/* Recall a value from a symbol, if bound */ |
/* Recall a value from a symbol, if bound */ |
618 |
extern void rcl(environment *env) |
extern void rcl(environment *env) |
619 |
{ |
{ |
620 |
value *val; |
value *val; |
621 |
|
|
622 |
if(env->head == NULL) { |
if(check_args(env, symb, empty)) |
623 |
printerr("Too Few Arguments"); |
return printerr(env); |
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->item->type!=symb) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
624 |
|
|
625 |
val=((symbol *)(env->head->item->content.ptr))->val; |
val= CAR(env->head)->content.sym->val; |
626 |
if(val == NULL){ |
if(val == NULL){ |
627 |
printerr("Unbound Variable"); |
env->err= 3; |
628 |
env->err=3; |
return printerr(env); |
|
return; |
|
629 |
} |
} |
630 |
toss(env); /* toss the symbol */ |
|
631 |
|
push_val(env, val); /* Return the symbol's bound value */ |
632 |
|
swap(env); |
633 |
if(env->err) return; |
if(env->err) return; |
634 |
push_val(&(env->head), val); /* Return its bound value */ |
env->head= CDR(env->head); |
635 |
} |
} |
636 |
|
|
|
void stack_read(environment*, char*); |
|
637 |
|
|
638 |
/* 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 |
639 |
function value, and if it is, toss the symbol and execute the |
function value, and if it is, toss the symbol and execute the |
642 |
{ |
{ |
643 |
funcp in_func; |
funcp in_func; |
644 |
value* temp_val; |
value* temp_val; |
645 |
stackitem* iterator; |
value* iterator; |
|
char* temp_string; |
|
646 |
|
|
647 |
if(env->head==NULL) { |
eval_start: |
648 |
printerr("Too Few Arguments"); |
|
649 |
env->err=1; |
gc_maybe(env); |
650 |
return; |
|
651 |
} |
if(check_args(env, unknown, empty)) |
652 |
|
return printerr(env); |
653 |
|
|
654 |
switch(env->head->item->type) { |
switch(CAR(env->head)->type) { |
655 |
/* if it's a symbol */ |
/* if it's a symbol */ |
656 |
case symb: |
case symb: |
657 |
|
env->errsymb= CAR(env->head)->content.sym->id; |
658 |
rcl(env); /* get its contents */ |
rcl(env); /* get its contents */ |
659 |
if(env->err) return; |
if(env->err) return; |
660 |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
if(CAR(env->head)->type!=symb){ /* don't recurse symbols */ |
661 |
return eval(env); /* evaluate the value */ |
goto eval_start; |
662 |
} |
} |
663 |
return; |
return; |
664 |
|
|
665 |
/* If it's a lone function value, run it */ |
/* If it's a lone function value, run it */ |
666 |
case func: |
case func: |
667 |
in_func= (funcp)(env->head->item->content.ptr); |
in_func= CAR(env->head)->content.func; |
668 |
toss(env); |
env->head= CDR(env->head); |
669 |
if(env->err) return; |
return in_func((void*)env); |
|
return (*in_func)(env); |
|
670 |
|
|
671 |
/* If it's a list */ |
/* If it's a list */ |
672 |
case list: |
case tcons: |
673 |
temp_val= env->head->item; |
temp_val= CAR(env->head); |
674 |
env->head->item->refcount++; |
protect(temp_val); |
675 |
toss(env); |
|
676 |
if(env->err) return; |
env->head= CDR(env->head); |
677 |
iterator= (stackitem*)temp_val->content.ptr; |
iterator= temp_val; |
678 |
while(iterator!=NULL) { |
|
679 |
push_val(&(env->head), iterator->item); |
while(iterator->type != empty) { |
680 |
if(env->head->item->type==symb |
push_val(env, CAR(iterator)); |
681 |
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
|
682 |
toss(env); |
if(CAR(env->head)->type==symb |
683 |
if(env->err) return; |
&& CAR(env->head)->content.sym->id[0]==';') { |
684 |
if(iterator->next == NULL){ |
env->head= CDR(env->head); |
685 |
free_val(temp_val); |
|
686 |
return eval(env); |
if(CDR(iterator)->type == empty){ |
687 |
|
goto eval_start; |
688 |
} |
} |
689 |
eval(env); |
eval(env); |
690 |
if(env->err) return; |
if(env->err) return; |
691 |
} |
} |
692 |
iterator= iterator->next; |
if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons) |
693 |
|
iterator= CDR(iterator); |
694 |
|
else { |
695 |
|
env->err= 2; /* Improper list */ |
696 |
|
return printerr(env); |
697 |
|
} |
698 |
} |
} |
699 |
free_val(temp_val); |
unprotect(temp_val); |
700 |
return; |
return; |
701 |
|
|
702 |
/* If it's a string */ |
case empty: |
703 |
case string: |
env->head= CDR(env->head); |
|
temp_val= env->head->item; |
|
|
env->head->item->refcount++; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
temp_string= malloc(strlen((char*)temp_val->content.ptr)+5); |
|
|
strcpy(temp_string, "[ "); |
|
|
strcpy(temp_string+2, (char*)temp_val->content.ptr); |
|
|
free_val(temp_val); |
|
|
strcat(temp_string, " ]"); |
|
|
stack_read(env, temp_string); |
|
|
free(temp_string); |
|
|
return eval(env); |
|
|
|
|
704 |
case integer: |
case integer: |
705 |
|
case tfloat: |
706 |
|
case string: |
707 |
|
case port: |
708 |
|
case unknown: |
709 |
return; |
return; |
710 |
} |
} |
711 |
} |
} |
712 |
|
|
|
/* 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; |
|
|
} |
|
713 |
|
|
714 |
if(env->head->item->type!=list) { |
/* Internal forget function */ |
715 |
printerr("Bad Argument Type"); |
void forget_sym(symbol **hash_entry) |
|
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) |
|
716 |
{ |
{ |
717 |
void* delimiter; |
symbol *temp; |
|
stackitem *iterator, *temp; |
|
|
value *pack; |
|
|
|
|
|
delimiter= env->head->item->content.ptr; /* Get delimiter */ |
|
|
toss(env); |
|
718 |
|
|
719 |
iterator= env->head; |
temp= *hash_entry; |
720 |
|
*hash_entry= (*hash_entry)->next; |
721 |
|
|
722 |
|
free(temp->id); |
723 |
|
free(temp); |
724 |
|
} |
725 |
|
|
|
if(iterator==NULL || iterator->item->content.ptr==delimiter) { |
|
|
temp= NULL; |
|
|
toss(env); |
|
|
} else { |
|
|
/* Search for first delimiter */ |
|
|
while(iterator->next!=NULL |
|
|
&& iterator->next->item->content.ptr!=delimiter) |
|
|
iterator= iterator->next; |
|
|
|
|
|
/* Extract list */ |
|
|
temp= env->head; |
|
|
env->head= iterator->next; |
|
|
iterator->next= NULL; |
|
|
|
|
|
if(env->head!=NULL) |
|
|
toss(env); |
|
|
} |
|
726 |
|
|
727 |
/* Push list */ |
int main(int argc, char **argv) |
728 |
pack= malloc(sizeof(value)); |
{ |
729 |
pack->type= list; |
environment myenv; |
730 |
pack->content.ptr= temp; |
int c; /* getopt option character */ |
|
pack->refcount= 1; |
|
731 |
|
|
732 |
temp= malloc(sizeof(stackitem)); |
#ifdef __linux__ |
733 |
temp->item= pack; |
mtrace(); |
734 |
|
#endif |
735 |
|
|
736 |
push(&(env->head), temp); |
init_env(&myenv); |
|
rev(env); |
|
|
} |
|
737 |
|
|
738 |
/* Parse input. */ |
myenv.interactive = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO); |
|
void stack_read(environment *env, char *in_line) |
|
|
{ |
|
|
char *temp, *rest; |
|
|
int itemp; |
|
|
size_t inlength= strlen(in_line)+1; |
|
|
int convert= 0; |
|
|
|
|
|
temp= malloc(inlength); |
|
|
rest= malloc(inlength); |
|
|
|
|
|
do { |
|
|
/* If comment */ |
|
|
if((convert= sscanf(in_line, "#%[^\n\r]", rest))) { |
|
|
free(temp); free(rest); |
|
|
return; |
|
|
} |
|
739 |
|
|
740 |
/* If string */ |
while ((c = getopt (argc, argv, "i")) != -1) |
741 |
if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest))) { |
switch (c) |
742 |
push_cstring(&(env->head), temp); |
{ |
743 |
break; |
case 'i': |
744 |
} |
myenv.interactive = 1; |
|
/* If integer */ |
|
|
if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest))) { |
|
|
push_int(&(env->head), itemp); |
|
|
break; |
|
|
} |
|
|
/* Escape ';' with '\' */ |
|
|
if((convert= sscanf(in_line, "\\%c%[^\n\r]", temp, rest))) { |
|
|
temp[1]= '\0'; |
|
|
push_sym(env, temp); |
|
|
break; |
|
|
} |
|
|
/* If symbol */ |
|
|
if((convert= sscanf(in_line, "%[^][ ;\n\r]%[^\n\r]", temp, rest))) { |
|
|
push_sym(env, temp); |
|
|
break; |
|
|
} |
|
|
/* If single char */ |
|
|
if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) { |
|
|
if(*temp==';') { |
|
|
if(!env->non_eval_flag) { |
|
|
eval(env); /* Evaluate top element */ |
|
|
break; |
|
|
} |
|
|
|
|
|
push_sym(env, ";"); |
|
745 |
break; |
break; |
746 |
|
case '?': |
747 |
|
fprintf (stderr, |
748 |
|
"Unknown option character '\\x%x'.\n", |
749 |
|
optopt); |
750 |
|
return EX_USAGE; |
751 |
|
default: |
752 |
|
abort (); |
753 |
} |
} |
754 |
|
|
755 |
|
if (optind < argc) { |
756 |
|
myenv.interactive = 0; |
757 |
|
myenv.inputstream= fopen(argv[optind], "r"); |
758 |
|
if(myenv.inputstream== NULL) { |
759 |
|
perror(argv[0]); |
760 |
|
exit (EX_NOINPUT); |
761 |
|
} |
762 |
|
} |
763 |
|
|
764 |
if(*temp==']') { |
if(myenv.interactive) |
765 |
push_sym(env, "["); |
puts(start_message); |
|
pack(env); |
|
|
if(env->non_eval_flag) |
|
|
env->non_eval_flag--; |
|
|
break; |
|
|
} |
|
766 |
|
|
767 |
if(*temp=='[') { |
while(1) { |
768 |
push_sym(env, "["); |
if(myenv.in_string==NULL) { |
769 |
env->non_eval_flag++; |
if (myenv.interactive) { |
770 |
break; |
if(myenv.err) { |
771 |
|
printf("(error %d)\n", myenv.err); |
772 |
|
myenv.err= 0; |
773 |
|
} |
774 |
|
printf("\n"); |
775 |
|
printstack(&myenv); |
776 |
|
printf("> "); |
777 |
} |
} |
778 |
|
myenv.err=0; |
779 |
|
} |
780 |
|
readstream(&myenv, myenv.inputstream); |
781 |
|
if (myenv.err) { /* EOF or other error */ |
782 |
|
myenv.err=0; |
783 |
|
quit(&myenv); |
784 |
|
} else if(myenv.head->type!=empty |
785 |
|
&& CAR(myenv.head)->type==symb |
786 |
|
&& CAR(myenv.head)->content.sym->id[0] == ';') { |
787 |
|
if(myenv.head->type != empty) |
788 |
|
myenv.head= CDR(myenv.head); |
789 |
|
eval(&myenv); |
790 |
|
} else { |
791 |
|
gc_maybe(&myenv); |
792 |
} |
} |
|
} while(0); |
|
|
|
|
|
free(temp); |
|
|
|
|
|
if(convert<2) { |
|
|
free(rest); |
|
|
return; |
|
793 |
} |
} |
794 |
|
quit(&myenv); |
795 |
stack_read(env, rest); |
return EXIT_FAILURE; |
|
|
|
|
free(rest); |
|
796 |
} |
} |
797 |
|
|
|
/* 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; |
|
|
return; |
|
|
} |
|
|
if(env->head->item->type!=list) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
|
|
|
|
rev(env); |
|
|
|
|
|
if(env->err) |
|
|
return; |
|
|
|
|
|
/* The first list element is the new stack head */ |
|
|
new_head= temp= env->head->item->content.ptr; |
|
|
|
|
|
env->head->item->refcount++; |
|
|
toss(env); |
|
|
|
|
|
/* Find the end of the list */ |
|
|
while(temp->next!=NULL) |
|
|
temp= temp->next; |
|
798 |
|
|
799 |
/* Connect the tail of the list with the old stack head */ |
/* Return copy of a value */ |
800 |
temp->next= env->head; |
value *copy_val(environment *env, value *old_value) |
|
env->head= new_head; /* ...and voila! */ |
|
|
|
|
|
} |
|
|
|
|
|
/* Compares two elements by reference. */ |
|
|
extern void eq(environment *env) |
|
801 |
{ |
{ |
802 |
void *left, *right; |
value *new_value; |
|
int result; |
|
803 |
|
|
804 |
if((env->head)==NULL || env->head->next==NULL) { |
if(old_value==NULL) |
805 |
printerr("Too Few Arguments"); |
return NULL; |
|
env->err=1; |
|
|
return; |
|
|
} |
|
806 |
|
|
807 |
left= env->head->item->content.ptr; |
new_value= new_val(env); |
808 |
swap(env); |
new_value->type= old_value->type; |
|
right= env->head->item->content.ptr; |
|
|
result= (left==right); |
|
|
|
|
|
toss(env); toss(env); |
|
|
push_int(&(env->head), result); |
|
|
} |
|
809 |
|
|
810 |
/* Negates the top element on the stack. */ |
switch(old_value->type){ |
811 |
extern void not(environment *env) |
case tfloat: |
812 |
{ |
case integer: |
813 |
int val; |
case func: |
814 |
|
case symb: |
815 |
|
case empty: |
816 |
|
case unknown: |
817 |
|
case port: |
818 |
|
new_value->content= old_value->content; |
819 |
|
break; |
820 |
|
case string: |
821 |
|
new_value->content.string= strdup(old_value->content.string); |
822 |
|
break; |
823 |
|
case tcons: |
824 |
|
|
825 |
if((env->head)==NULL) { |
new_value->content.c= malloc(sizeof(pair)); |
826 |
printerr("Too Few Arguments"); |
assert(new_value->content.c!=NULL); |
827 |
env->err=1; |
env->gc_count += sizeof(pair); |
|
return; |
|
|
} |
|
828 |
|
|
829 |
if(env->head->item->type!=integer) { |
CAR(new_value)= copy_val(env, CAR(old_value)); /* recurse */ |
830 |
printerr("Bad Argument Type"); |
CDR(new_value)= copy_val(env, CDR(old_value)); /* recurse */ |
831 |
env->err=2; |
break; |
|
return; |
|
832 |
} |
} |
833 |
|
|
834 |
val= env->head->item->content.val; |
return new_value; |
|
toss(env); |
|
|
push_int(&(env->head), !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); |
|
835 |
} |
} |
836 |
|
|
|
/* 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; |
|
|
return; |
|
|
} |
|
|
|
|
|
/* 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); |
|
|
} |
|
837 |
|
|
838 |
/* Quit stack. */ |
/* read a line from a stream; used by readline */ |
839 |
extern void quit(environment *env) |
void readlinestream(environment *env, FILE *stream) |
840 |
{ |
{ |
841 |
exit(EXIT_SUCCESS); |
char in_string[101]; |
|
} |
|
|
|
|
|
/* Clear stack */ |
|
|
extern void clear(environment *env) |
|
|
{ |
|
|
while(env->head!=NULL) |
|
|
toss(env); |
|
|
} |
|
842 |
|
|
843 |
/* List all defined words */ |
if(fgets(in_string, 100, stream)==NULL) { |
844 |
extern void words(environment *env) |
push_cstring(env, ""); |
845 |
{ |
if (! feof(stream)){ |
846 |
symbol *temp; |
perror("readline"); |
847 |
int i; |
env->err= 5; |
|
|
|
|
for(i= 0; i<HASHTBLSIZE; i++) { |
|
|
temp= env->symbols[i]; |
|
|
while(temp!=NULL) { |
|
|
printf("%s\n", temp->id); |
|
|
temp= temp->next; |
|
848 |
} |
} |
849 |
|
} else { |
850 |
|
push_cstring(env, in_string); |
851 |
} |
} |
852 |
} |
} |
853 |
|
|
854 |
/* Forgets a symbol (remove it from the hash table) */ |
|
855 |
extern void forget(environment *env) |
/* Reverse (flip) a list */ |
856 |
|
extern void rev(environment *env) |
857 |
{ |
{ |
858 |
char* sym_id; |
value *old_head, *new_head, *item; |
|
stackitem *stack_head= env->head; |
|
|
symbol **hash_entry, *temp; |
|
859 |
|
|
860 |
if(stack_head==NULL) { |
if(CAR(env->head)->type==empty) |
861 |
printerr("Too Few Arguments"); |
return; /* Don't reverse an empty list */ |
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(stack_head->item->type!=symb) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
862 |
|
|
863 |
sym_id= ((symbol*)(stack_head->item->content.ptr))->id; |
if(check_args(env, tcons, empty)) |
864 |
toss(env); |
return printerr(env); |
865 |
|
|
866 |
hash_entry= hash(env->symbols, sym_id); |
old_head= CAR(env->head); |
867 |
temp= *hash_entry; |
new_head= new_val(env); |
868 |
*hash_entry= (*hash_entry)->next; |
while(old_head->type != empty) { |
869 |
|
item= old_head; |
870 |
if(temp->val!=NULL) { |
old_head= CDR(old_head); |
871 |
free_val(temp->val); |
CDR(item)= new_head; |
872 |
|
new_head= item; |
873 |
} |
} |
874 |
free(temp->id); |
CAR(env->head)= new_head; |
|
free(temp); |
|
875 |
} |
} |
876 |
|
|
|
/* Returns the current error number to the stack */ |
|
|
extern void errn(environment *env){ |
|
|
push_int(&(env->head), env->err); |
|
|
} |
|
877 |
|
|
878 |
int main() |
/* Make a list. */ |
879 |
|
extern void pack(environment *env) |
880 |
{ |
{ |
881 |
environment myenv; |
value *iterator, *temp, *ending; |
|
char in_string[100]; |
|
882 |
|
|
883 |
init_env(&myenv); |
ending=new_val(env); |
884 |
|
|
885 |
printf("okidok\n "); |
iterator= env->head; |
886 |
|
if(iterator->type == empty |
887 |
|
|| (CAR(iterator)->type==symb |
888 |
|
&& CAR(iterator)->content.sym->id[0]=='[')) { |
889 |
|
temp= ending; |
890 |
|
if(env->head->type != empty) |
891 |
|
env->head= CDR(env->head); |
892 |
|
} else { |
893 |
|
/* Search for first delimiter */ |
894 |
|
while(CDR(iterator)->type != empty |
895 |
|
&& (CAR(CDR(iterator))->type!=symb |
896 |
|
|| CAR(CDR(iterator))->content.sym->id[0]!='[')) |
897 |
|
iterator= CDR(iterator); |
898 |
|
|
899 |
|
/* Extract list */ |
900 |
|
temp= env->head; |
901 |
|
env->head= CDR(iterator); |
902 |
|
CDR(iterator)= ending; |
903 |
|
|
904 |
while(fgets(in_string, 100, stdin) != NULL) { |
if(env->head->type != empty) |
905 |
stack_read(&myenv, in_string); |
env->head= CDR(env->head); |
|
if(myenv.err) { |
|
|
printf("(error %d) ", myenv.err); |
|
|
myenv.err=0; |
|
|
} |
|
|
printf("okidok\n "); |
|
906 |
} |
} |
|
quit(&myenv); |
|
|
return EXIT_FAILURE; |
|
|
} |
|
907 |
|
|
908 |
/* + */ |
/* Push list */ |
|
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; |
|
|
} |
|
909 |
|
|
910 |
if(env->head->item->type==string |
push_val(env, temp); |
911 |
&& env->head->next->item->type==string) { |
rev(env); |
|
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->head), 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; |
|
|
b=env->head->item->content.val; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
push_int(&(env->head), a+b); |
|
912 |
} |
} |
913 |
|
|
|
/* - */ |
|
|
extern void sx_2d(environment *env) { |
|
|
int a; |
|
|
|
|
|
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; |
|
|
env->head->item->content.val -= a; |
|
|
} |
|
914 |
|
|
915 |
/* > */ |
/* read from a stream; used by "read" and "readport" */ |
916 |
extern void sx_3e(environment *env) { |
void readstream(environment *env, FILE *stream) |
917 |
int a; |
{ |
918 |
|
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n"; |
919 |
|
const char strform[]= "\"%[^\"]\"%n"; |
920 |
|
const char intform[]= "%i%n"; |
921 |
|
const char fltform[]= "%f%n"; |
922 |
|
const char blankform[]= "%*[ \t]%n"; |
923 |
|
const char ebrackform[]= "]%n"; |
924 |
|
const char semicform[]= ";%n"; |
925 |
|
const char bbrackform[]= "[%n"; |
926 |
|
|
927 |
|
int itemp, readlength= -1; |
928 |
|
int count= -1; |
929 |
|
float ftemp; |
930 |
|
static int depth= 0; |
931 |
|
char *match; |
932 |
|
size_t inlength; |
933 |
|
|
934 |
|
if(env->in_string==NULL) { |
935 |
|
if(depth > 0 && env->interactive) { |
936 |
|
printf("]> "); |
937 |
|
} |
938 |
|
readlinestream(env, env->inputstream); |
939 |
|
if(env->err) return; |
940 |
|
|
941 |
if((env->head)==NULL || env->head->next==NULL) { |
if((CAR(env->head)->content.string)[0]=='\0'){ |
942 |
printerr("Too Few Arguments"); |
env->err= 4; /* "" means EOF */ |
943 |
env->err=1; |
return; |
944 |
return; |
} |
945 |
|
|
946 |
|
env->in_string= malloc(strlen(CAR(env->head)->content.string)+1); |
947 |
|
assert(env->in_string != NULL); |
948 |
|
env->free_string= env->in_string; /* Save the original pointer */ |
949 |
|
strcpy(env->in_string, CAR(env->head)->content.string); |
950 |
|
env->head= CDR(env->head); |
951 |
} |
} |
952 |
|
|
953 |
if(env->head->item->type!=integer |
inlength= strlen(env->in_string)+1; |
954 |
|| env->head->next->item->type!=integer) { |
match= malloc(inlength); |
955 |
printerr("Bad Argument Type"); |
assert(match != NULL); |
956 |
env->err=2; |
|
957 |
return; |
if(sscanf(env->in_string, blankform, &readlength) != EOF |
958 |
} |
&& readlength != -1) { |
959 |
a=env->head->item->content.val; |
; |
960 |
toss(env); |
} else if(sscanf(env->in_string, fltform, &ftemp, &readlength) != EOF |
961 |
if(env->err) return; |
&& readlength != -1) { |
962 |
env->head->item->content.val = (env->head->item->content.val > a); |
if(sscanf(env->in_string, intform, &itemp, &count) != EOF |
963 |
} |
&& count==readlength) { |
964 |
|
push_int(env, itemp); |
965 |
/* Return copy of a value */ |
} else { |
966 |
value *copy_val(value *old_value){ |
push_float(env, ftemp); |
967 |
stackitem *old_item, *new_item, *prev_item; |
} |
968 |
|
} else if(sscanf(env->in_string, "\"\"%n", &readlength) != EOF |
969 |
value *new_value=malloc(sizeof(value)); |
&& readlength != -1) { |
970 |
|
push_cstring(env, ""); |
971 |
new_value->type=old_value->type; |
} else if(sscanf(env->in_string, strform, match, &readlength) != EOF |
972 |
new_value->refcount=0; /* This is increased if/when this |
&& readlength != -1) { |
973 |
value is referenced somewhere, like |
push_cstring(env, match); |
974 |
in a stack item or a variable */ |
} else if(sscanf(env->in_string, symbform, match, &readlength) != EOF |
975 |
switch(old_value->type){ |
&& readlength != -1) { |
976 |
case integer: |
push_sym(env, match); |
977 |
new_value->content.val=old_value->content.val; |
} else if(sscanf(env->in_string, ebrackform, &readlength) != EOF |
978 |
break; |
&& readlength != -1) { |
979 |
case string: |
pack(env); if(env->err) return; |
980 |
(char *)(new_value->content.ptr) |
if(depth != 0) depth--; |
981 |
= strdup((char *)(old_value->content.ptr)); |
} else if(sscanf(env->in_string, semicform, &readlength) != EOF |
982 |
break; |
&& readlength != -1) { |
983 |
case func: |
push_sym(env, ";"); |
984 |
case symb: |
} else if(sscanf(env->in_string, bbrackform, &readlength) != EOF |
985 |
new_value->content.ptr=old_value->content.ptr; |
&& readlength != -1) { |
986 |
break; |
push_sym(env, "["); |
987 |
case list: |
depth++; |
988 |
new_value->content.ptr=NULL; |
} else { |
989 |
|
free(env->free_string); |
990 |
prev_item=NULL; |
env->in_string = env->free_string = NULL; |
|
old_item=(stackitem *)(old_value->content.ptr); |
|
|
|
|
|
while(old_item != NULL) { /* While list is not empty */ |
|
|
new_item= malloc(sizeof(stackitem)); |
|
|
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; |
|
|
} |
|
|
break; |
|
|
} |
|
|
return new_value; |
|
|
} |
|
|
|
|
|
/* duplicates an item on the stack */ |
|
|
extern void dup(environment *env) { |
|
|
if((env->head)==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
push_val(&(env->head), copy_val(env->head->item)); |
|
|
} |
|
|
|
|
|
/* "if", If-Then */ |
|
|
extern void sx_6966(environment *env) { |
|
|
|
|
|
int truth; |
|
|
|
|
|
if((env->head)==NULL || env->head->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
991 |
} |
} |
992 |
|
if (env->in_string != NULL) { |
993 |
if(env->head->next->item->type != integer) { |
env->in_string += readlength; |
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
994 |
} |
} |
|
|
|
|
swap(env); |
|
|
if(env->err) return; |
|
|
|
|
|
truth=env->head->item->content.val; |
|
995 |
|
|
996 |
toss(env); |
free(match); |
|
if(env->err) return; |
|
997 |
|
|
998 |
if(truth) |
if(depth) |
999 |
eval(env); |
return readstream(env, env->inputstream); |
|
else |
|
|
toss(env); |
|
1000 |
} |
} |
1001 |
|
|
|
/* If-Then-Else */ |
|
|
extern void ifelse(environment *env) { |
|
|
|
|
|
int truth; |
|
|
|
|
|
if((env->head)==NULL || env->head->next==NULL |
|
|
|| env->head->next->next==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->next->next->item->type != integer) { |
|
|
printerr("Bad Argument Type"); |
|
|
env->err=2; |
|
|
return; |
|
|
} |
|
|
|
|
|
rot(env); |
|
|
if(env->err) return; |
|
|
|
|
|
truth=env->head->item->content.val; |
|
1002 |
|
|
1003 |
toss(env); |
int check_args(environment *env, ...) |
1004 |
if(env->err) return; |
{ |
1005 |
|
va_list ap; |
1006 |
|
enum type_enum mytype; |
1007 |
|
|
1008 |
if(!truth) |
value *iter= env->head; |
1009 |
swap(env); |
int errval= 0; |
|
if(env->err) return; |
|
1010 |
|
|
1011 |
toss(env); |
va_start(ap, env); |
1012 |
if(env->err) return; |
while(1) { |
1013 |
|
mytype= va_arg(ap, enum type_enum); |
1014 |
|
// fprintf(stderr, "%s\n", env->errsymb); |
1015 |
|
|
1016 |
eval(env); |
if(mytype==empty) |
1017 |
} |
break; |
1018 |
|
|
1019 |
|
if(iter->type==empty || iter==NULL) { |
1020 |
|
errval= 1; |
1021 |
|
break; |
1022 |
|
} |
1023 |
|
|
1024 |
/* while */ |
if(mytype==unknown) { |
1025 |
extern void sx_7768696c65(environment *env) { |
iter=CDR(iter); |
1026 |
|
continue; |
1027 |
|
} |
1028 |
|
|
1029 |
int truth; |
if(CAR(iter)->type!=mytype) { |
1030 |
|
errval= 2; |
1031 |
|
break; |
1032 |
|
} |
1033 |
|
|
1034 |
if((env->head)==NULL || env->head->next==NULL) { |
iter= CDR(iter); |
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
1035 |
} |
} |
1036 |
|
|
1037 |
do { |
va_end(ap); |
1038 |
swap(env); if(env->err) return; |
|
1039 |
dup(env); if(env->err) return; |
env->err= errval; |
1040 |
eval(env); if(env->err) return; |
return errval; |
|
|
|
|
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; |
|
|
swap(env); if(env->err) return; |
|
|
|
|
|
if(truth) { |
|
|
dup(env); |
|
|
eval(env); |
|
|
} else { |
|
|
toss(env); |
|
|
toss(env); |
|
|
} |
|
|
|
|
|
} while(truth); |
|
1041 |
} |
} |