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/* printf */ |
/* -*- coding: utf-8; -*- */ |
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#include <stdio.h> |
/* |
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/* EXIT_SUCCESS */ |
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> |
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/* dlopen, dlsym, dlerror */ |
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#include <dlfcn.h> |
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#define HASHTBLSIZE 65536 |
This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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typedef struct stack_item |
This program is distributed in the hope that it will be useful, |
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{ |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
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enum {value, string, ref, func, symbol, list} type; |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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union { |
GNU General Public License for more details. |
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void* ptr; |
|
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int val; |
You should have received a copy of the GNU General Public License |
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} content; |
along with this program; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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Authors: Mats Alritzson <masse@fukt.bth.se> |
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Teddy Hogeborn <teddy@fukt.bth.se> |
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*/ |
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char* id; |
#include "stack.h" |
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struct stack_item* next; |
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} stackitem; |
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const char* start_message= "Stack version $Revision$\n\ |
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Copyright (C) 2002 Mats Alritzson and Teddy Hogeborn\n\ |
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Stack comes with ABSOLUTELY NO WARRANTY; for details type 'warranty;'.\n\ |
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This is free software, and you are welcome to redistribute it\n\ |
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under certain conditions; type 'copying;' for details."; |
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typedef stackitem* hashtbl[HASHTBLSIZE]; |
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typedef void (*funcp)(stackitem**); |
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void init_hashtbl(hashtbl out_hash) |
/* Initialize a newly created environment */ |
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void init_env(environment *env) |
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{ |
{ |
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long i; |
int i; |
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env->gc_limit= 400000; |
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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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out_hash[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(environment *env) |
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{ |
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char *in_string; |
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switch(env->err) { |
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case 0: |
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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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case 5: |
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return perror(env->errsymb); |
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default: |
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in_string= "Unknown error"; |
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break; |
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} |
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fprintf(stderr, "\"%s\":\nErr: %s\n", env->errsymb, in_string); |
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} |
} |
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stackitem** hash(hashtbl in_hashtbl, const char* in_string) |
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/* 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) |
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{ |
{ |
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long i= 0; |
int i= 0; |
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unsigned long out_hash= 0; |
unsigned int out_hash= 0; |
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char key= 0; |
char key= '\0'; |
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stackitem** position; |
symbol **position; |
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|
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while(1){ |
while(1){ /* Hash in_string */ |
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key= in_string[i++]; |
key= in_string[i++]; |
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if(key=='\0') |
if(key=='\0') |
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break; |
break; |
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position= &(in_hashtbl[out_hash]); |
position= &(in_hashtbl[out_hash]); |
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while(1){ |
while(1){ |
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if(*position==NULL) |
if(*position==NULL) /* If empty */ |
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return position; |
return position; |
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if(strcmp(in_string, (*position)->id)==0) |
if(strcmp(in_string, (*position)->id)==0) /* If match */ |
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return position; |
return position; |
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position= &((*position)->next); |
position= &((*position)->next); /* Try next */ |
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} |
} |
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} |
} |
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int push(stackitem** stack_head, stackitem* in_item) |
/* Create new value */ |
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value* new_val(environment *env) |
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{ |
{ |
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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)); |
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return 1; |
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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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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; |
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} |
} |
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int push_val(stackitem** stack_head, int in_val) |
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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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stackitem* new_item= malloc(sizeof(stackitem)); |
if(val==NULL || val->gc.flag.mark) |
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new_item->content.val= in_val; |
return; |
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new_item->type= value; |
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val->gc.flag.mark= 1; |
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push(stack_head, new_item); |
if(val->type==tcons) { |
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return 1; |
gc_mark(CAR(val)); |
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gc_mark(CDR(val)); |
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} |
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} |
} |
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int push_cstring(stackitem** stack_head, const char* in_string) |
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/* Start GC */ |
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extern void gc_init(environment *env) |
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{ |
{ |
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stackitem* new_item= malloc(sizeof(stackitem)); |
stackitem *new_head= NULL, *titem; |
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new_item->content.ptr= malloc(strlen(in_string)+1); |
symbol *tsymb; |
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strcpy(new_item->content.ptr, in_string); |
int i; |
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new_item->type= string; |
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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 */ |
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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; |
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titem= env->gc_ref->next; |
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env->gc_ref->next= new_head; |
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new_head= env->gc_ref; |
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new_head->item->gc.flag.mark= 0; |
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env->gc_ref= titem; |
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} |
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if (env->gc_limit < env->gc_count*2) |
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env->gc_limit= env->gc_count*2; |
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env->gc_ref= new_head; |
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if(env->interactive) |
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printf("done (%d bytes still allocated)\n", env->gc_count); |
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push(stack_head, new_item); |
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return 1; |
|
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} |
} |
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int mk_hashentry(hashtbl in_hashtbl, stackitem* in_item, const char* id) |
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inline void gc_maybe(environment *env) |
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{ |
{ |
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in_item->id= malloc(strlen(id)+1); |
if(env->gc_count < env->gc_limit) |
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return; |
260 |
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else |
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return gc_init(env); |
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} |
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strcpy(in_item->id, id); |
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push(hash(in_hashtbl, id), in_item); |
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return 1; |
/* Protect values from GC */ |
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void protect(value *val) |
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{ |
268 |
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if(val==NULL || val->gc.flag.protect) |
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return; |
270 |
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val->gc.flag.protect= 1; |
272 |
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if(val->type==tcons) { |
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protect(CAR(val)); |
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protect(CDR(val)); |
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} |
277 |
} |
} |
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void def_func(hashtbl in_hashtbl, funcp in_func, const char* id) |
|
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/* Unprotect values from GC */ |
281 |
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void unprotect(value *val) |
282 |
{ |
{ |
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stackitem* temp= malloc(sizeof(stackitem)); |
if(val==NULL || !(val->gc.flag.protect)) |
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return; |
285 |
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val->gc.flag.protect= 0; |
287 |
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288 |
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if(val->type==tcons) { |
289 |
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unprotect(CAR(val)); |
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unprotect(CDR(val)); |
291 |
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} |
292 |
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} |
293 |
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294 |
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temp->type= func; |
/* Push a value onto the stack */ |
296 |
temp->content.ptr= in_func; |
void push_val(environment *env, value *val) |
297 |
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{ |
298 |
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value *new_value= new_val(env); |
299 |
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|
300 |
mk_hashentry(in_hashtbl, temp, id); |
new_value->content.c= malloc(sizeof(pair)); |
301 |
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assert(new_value->content.c!=NULL); |
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env->gc_count += sizeof(pair); |
303 |
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new_value->type= tcons; |
304 |
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CAR(new_value)= val; |
305 |
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CDR(new_value)= env->head; |
306 |
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env->head= new_value; |
307 |
} |
} |
308 |
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|
309 |
void def_sym(hashtbl in_hashtbl, const char* id) |
|
310 |
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/* Push an integer onto the stack */ |
311 |
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void push_int(environment *env, int in_val) |
312 |
{ |
{ |
313 |
stackitem* temp= malloc(sizeof(stackitem)); |
value *new_value= new_val(env); |
314 |
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|
315 |
temp->type= symbol; |
new_value->content.i= in_val; |
316 |
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new_value->type= integer; |
317 |
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318 |
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push_val(env, new_value); |
319 |
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} |
320 |
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321 |
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322 |
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/* Push a floating point number onto the stack */ |
323 |
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void push_float(environment *env, float in_val) |
324 |
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{ |
325 |
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value *new_value= new_val(env); |
326 |
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327 |
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new_value->content.f= in_val; |
328 |
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new_value->type= tfloat; |
329 |
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|
330 |
mk_hashentry(in_hashtbl, temp, id); |
push_val(env, new_value); |
331 |
} |
} |
332 |
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333 |
int push_ref(stackitem** stack_head, hashtbl in_hash, const char* in_string) |
|
334 |
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/* Copy a string onto the stack. */ |
335 |
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void push_cstring(environment *env, const char *in_string) |
336 |
{ |
{ |
337 |
static void* handle= NULL; |
value *new_value= new_val(env); |
338 |
void* symbol; |
int length= strlen(in_string)+1; |
339 |
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|
340 |
stackitem* new_item= malloc(sizeof(stackitem)); |
new_value->content.string= malloc(length); |
341 |
new_item->content.ptr= *hash(in_hash, in_string); |
assert(new_value != NULL); |
342 |
new_item->type= ref; |
env->gc_count += length; |
343 |
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strcpy(new_value->content.string, in_string); |
344 |
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new_value->type= string; |
345 |
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|
346 |
if(handle==NULL) |
push_val(env, new_value); |
347 |
handle= dlopen(NULL, RTLD_LAZY); |
} |
348 |
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|
349 |
if(new_item->content.ptr==NULL) { |
|
350 |
symbol= dlsym(handle, in_string); |
/* Mangle a symbol name to a valid C identifier name */ |
351 |
if(dlerror()==NULL) |
char *mangle_str(const char *old_string) |
352 |
def_func(in_hash, symbol, in_string); |
{ |
353 |
else |
char validchars[]= "0123456789abcdef"; |
354 |
def_sym(in_hash, in_string); |
char *new_string, *current; |
355 |
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|
356 |
new_item->content.ptr= *hash(in_hash, in_string); |
new_string= malloc((strlen(old_string)*2)+4); |
357 |
new_item->type= ref; |
assert(new_string != NULL); |
358 |
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strcpy(new_string, "sx_"); /* Stack eXternal */ |
359 |
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current= new_string+3; |
360 |
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|
361 |
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while(old_string[0] != '\0'){ |
362 |
|
current[0]= validchars[(unsigned char)(old_string[0])/16]; |
363 |
|
current[1]= validchars[(unsigned char)(old_string[0])%16]; |
364 |
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current+= 2; |
365 |
|
old_string++; |
366 |
} |
} |
367 |
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current[0]= '\0'; |
368 |
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|
369 |
push(stack_head, new_item); |
return new_string; /* The caller must free() it */ |
|
return 1; |
|
370 |
} |
} |
371 |
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|
372 |
extern void toss(stackitem** stack_head) |
|
373 |
|
/* Push a symbol onto the stack. */ |
374 |
|
void push_sym(environment *env, const char *in_string) |
375 |
{ |
{ |
376 |
stackitem* temp= *stack_head; |
value *new_value; /* A new symbol value */ |
377 |
|
/* ...which might point to... */ |
378 |
|
symbol **new_symbol; /* (if needed) A new actual symbol */ |
379 |
|
/* ...which, if possible, will be bound to... */ |
380 |
|
value *new_fvalue; /* (if needed) A new function value */ |
381 |
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/* ...which will point to... */ |
382 |
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void *funcptr; /* A function pointer */ |
383 |
|
|
384 |
if((*stack_head)==NULL) |
static void *handle= NULL; /* Dynamic linker handle */ |
385 |
return; |
const char *dlerr; /* Dynamic linker error */ |
386 |
|
char *mangled; /* Mangled function name */ |
|
if((*stack_head)->type==string) |
|
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free((*stack_head)->content.ptr); |
|
387 |
|
|
388 |
*stack_head= (*stack_head)->next; |
new_value= new_val(env); |
389 |
free(temp); |
new_fvalue= new_val(env); |
390 |
|
|
391 |
|
/* The new value is a symbol */ |
392 |
|
new_value->type= symb; |
393 |
|
|
394 |
|
/* Look up the symbol name in the hash table */ |
395 |
|
new_symbol= hash(env->symbols, in_string); |
396 |
|
new_value->content.sym= *new_symbol; |
397 |
|
|
398 |
|
if(*new_symbol==NULL) { /* If symbol was undefined */ |
399 |
|
|
400 |
|
/* Create a new symbol */ |
401 |
|
(*new_symbol)= malloc(sizeof(symbol)); |
402 |
|
assert((*new_symbol) != NULL); |
403 |
|
(*new_symbol)->val= NULL; /* undefined value */ |
404 |
|
(*new_symbol)->next= NULL; |
405 |
|
(*new_symbol)->id= malloc(strlen(in_string)+1); |
406 |
|
assert((*new_symbol)->id != NULL); |
407 |
|
strcpy((*new_symbol)->id, in_string); |
408 |
|
|
409 |
|
/* Intern the new symbol in the hash table */ |
410 |
|
new_value->content.sym= *new_symbol; |
411 |
|
|
412 |
|
/* Try to load the symbol name as an external function, to see if |
413 |
|
we should bind the symbol to a new function pointer value */ |
414 |
|
if(handle==NULL) /* If no handle */ |
415 |
|
handle= dlopen(NULL, RTLD_LAZY); |
416 |
|
|
417 |
|
mangled= mangle_str(in_string); /* mangle the name */ |
418 |
|
funcptr= dlsym(handle, mangled); /* and try to find it */ |
419 |
|
|
420 |
|
dlerr= dlerror(); |
421 |
|
if(dlerr != NULL) { /* If no function was found */ |
422 |
|
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
423 |
|
dlerr= dlerror(); |
424 |
|
} |
425 |
|
|
426 |
|
if(dlerr==NULL) { /* If a function was found */ |
427 |
|
new_fvalue->type= func; /* The new value is a function pointer */ |
428 |
|
new_fvalue->content.func= funcptr; /* Store function pointer */ |
429 |
|
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
430 |
|
function value */ |
431 |
|
} |
432 |
|
|
433 |
|
free(mangled); |
434 |
|
} |
435 |
|
|
436 |
|
push_val(env, new_value); |
437 |
} |
} |
438 |
|
|
439 |
|
|
440 |
/* print_stack(stack); */ |
/* Print a value */ |
441 |
void print_st(stackitem* stack_head, long counter) |
void print_val(environment *env, value *val, int noquote, stackitem *stack, |
442 |
{ |
FILE *stream) |
443 |
if(stack_head->next != NULL) |
{ |
444 |
print_st(stack_head->next, counter+1); |
stackitem *titem, *tstack; |
445 |
|
int depth; |
446 |
switch(stack_head->type){ |
|
447 |
case value: |
switch(val->type) { |
448 |
printf("%ld: %d\n", counter, (int)stack_head->content.val); |
case empty: |
449 |
|
if(fprintf(stream, "[]") < 0) |
450 |
|
env->err= 5; |
451 |
|
break; |
452 |
|
case unknown: |
453 |
|
if(fprintf(stream, "UNKNOWN") < 0) |
454 |
|
env->err= 5; |
455 |
|
break; |
456 |
|
case integer: |
457 |
|
if(fprintf(stream, "%d", val->content.i) < 0) |
458 |
|
env->err= 5; |
459 |
|
break; |
460 |
|
case tfloat: |
461 |
|
if(fprintf(stream, "%f", val->content.f) < 0) |
462 |
|
env->err= 5; |
463 |
break; |
break; |
464 |
case string: |
case string: |
465 |
printf("%ld: \"%s\"\n", counter, (char*)stack_head->content.ptr); |
if(noquote){ |
466 |
|
if(fprintf(stream, "%s", val->content.string) < 0) |
467 |
|
env->err= 5; |
468 |
|
} else { /* quote */ |
469 |
|
if(fprintf(stream, "\"%s\"", val->content.string) < 0) |
470 |
|
env->err= 5; |
471 |
|
} |
472 |
break; |
break; |
473 |
case ref: |
case symb: |
474 |
printf("%ld: %s\n", counter, ((stackitem*)stack_head->content.ptr)->id); |
if(fprintf(stream, "%s", val->content.sym->id) < 0) |
475 |
|
env->err= 5; |
476 |
break; |
break; |
477 |
case func: |
case func: |
478 |
case symbol: |
if(fprintf(stream, "#<function %p>", val->content.func) < 0) |
479 |
default: |
env->err= 5; |
480 |
printf("%ld: %p\n", counter, stack_head->content.ptr); |
break; |
481 |
|
case port: |
482 |
|
if(fprintf(stream, "#<port %p>", val->content.p) < 0) |
483 |
|
env->err= 5; |
484 |
|
break; |
485 |
|
case tcons: |
486 |
|
if(fprintf(stream, "[ ") < 0) { |
487 |
|
env->err= 5; |
488 |
|
return printerr(env); |
489 |
|
} |
490 |
|
tstack= stack; |
491 |
|
|
492 |
|
do { |
493 |
|
titem=malloc(sizeof(stackitem)); |
494 |
|
assert(titem != NULL); |
495 |
|
titem->item=val; |
496 |
|
titem->next=tstack; |
497 |
|
tstack=titem; /* Put it on the stack */ |
498 |
|
/* Search a stack of values being printed to see if we are already |
499 |
|
printing this value */ |
500 |
|
titem=tstack; |
501 |
|
depth=0; |
502 |
|
|
503 |
|
while(titem != NULL && titem->item != CAR(val)){ |
504 |
|
titem=titem->next; |
505 |
|
depth++; |
506 |
|
} |
507 |
|
|
508 |
|
if(titem != NULL){ /* If we found it on the stack, */ |
509 |
|
if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */ |
510 |
|
env->err= 5; |
511 |
|
free(titem); |
512 |
|
return printerr(env); |
513 |
|
} |
514 |
|
} else { |
515 |
|
print_val(env, CAR(val), noquote, tstack, stream); |
516 |
|
} |
517 |
|
|
518 |
|
val= CDR(val); |
519 |
|
switch(val->type){ |
520 |
|
case empty: |
521 |
|
break; |
522 |
|
case tcons: |
523 |
|
/* Search a stack of values being printed to see if we are already |
524 |
|
printing this value */ |
525 |
|
titem=tstack; |
526 |
|
depth=0; |
527 |
|
|
528 |
|
while(titem != NULL && titem->item != val){ |
529 |
|
titem=titem->next; |
530 |
|
depth++; |
531 |
|
} |
532 |
|
if(titem != NULL){ /* If we found it on the stack, */ |
533 |
|
if(fprintf(stream, " . #%d#", depth) < 0){ /* print a depth reference */ |
534 |
|
env->err= 5; |
535 |
|
printerr(env); |
536 |
|
goto printval_end; |
537 |
|
} |
538 |
|
} else { |
539 |
|
if(fprintf(stream, " ") < 0){ |
540 |
|
env->err= 5; |
541 |
|
printerr(env); |
542 |
|
goto printval_end; |
543 |
|
} |
544 |
|
} |
545 |
|
break; |
546 |
|
default: |
547 |
|
if(fprintf(stream, " . ") < 0){ /* Improper list */ |
548 |
|
env->err= 5; |
549 |
|
printerr(env); |
550 |
|
goto printval_end; |
551 |
|
} |
552 |
|
print_val(env, val, noquote, tstack, stream); |
553 |
|
} |
554 |
|
} while(val->type == tcons && titem == NULL); |
555 |
|
|
556 |
|
printval_end: |
557 |
|
|
558 |
|
titem=tstack; |
559 |
|
while(titem != stack){ |
560 |
|
tstack=titem->next; |
561 |
|
free(titem); |
562 |
|
titem=tstack; |
563 |
|
} |
564 |
|
|
565 |
|
if(! (env->err)){ |
566 |
|
if(fprintf(stream, " ]") < 0){ |
567 |
|
env->err= 5; |
568 |
|
} |
569 |
|
} |
570 |
break; |
break; |
571 |
} |
} |
572 |
|
|
573 |
|
if(env->err) |
574 |
|
return printerr(env); |
575 |
} |
} |
576 |
|
|
577 |
extern void printstack(stackitem** stack_head) |
|
578 |
|
/* Swap the two top elements on the stack. */ |
579 |
|
extern void swap(environment *env) |
580 |
{ |
{ |
581 |
if(*stack_head != NULL) { |
value *temp= env->head; |
582 |
print_st(*stack_head, 1); |
|
583 |
printf("\n"); |
if(check_args(env, 2, unknown, unknown)) |
584 |
|
return printerr(env); |
585 |
|
|
586 |
|
env->head= CDR(env->head); |
587 |
|
CDR(temp)= CDR(env->head); |
588 |
|
CDR(env->head)= temp; |
589 |
|
} |
590 |
|
|
591 |
|
|
592 |
|
/* Recall a value from a symbol, if bound */ |
593 |
|
extern void rcl(environment *env) |
594 |
|
{ |
595 |
|
value *val; |
596 |
|
|
597 |
|
if(check_args(env, 1, symb)) |
598 |
|
return printerr(env); |
599 |
|
|
600 |
|
val= CAR(env->head)->content.sym->val; |
601 |
|
if(val == NULL){ |
602 |
|
env->err= 3; |
603 |
|
return printerr(env); |
604 |
} |
} |
605 |
|
|
606 |
|
push_val(env, val); /* Return the symbol's bound value */ |
607 |
|
swap(env); |
608 |
|
if(env->err) return; |
609 |
|
env->head= CDR(env->head); |
610 |
} |
} |
611 |
|
|
612 |
|
|
613 |
extern void eval(stackitem** stack_head) |
/* If the top element is a symbol, determine if it's bound to a |
614 |
|
function value, and if it is, toss the symbol and execute the |
615 |
|
function. */ |
616 |
|
extern void eval(environment *env) |
617 |
{ |
{ |
618 |
funcp in_func; |
funcp in_func; |
619 |
|
value* temp_val; |
620 |
|
value* iterator; |
621 |
|
|
622 |
|
eval_start: |
623 |
|
|
624 |
|
gc_maybe(env); |
625 |
|
|
626 |
if((*stack_head)==NULL || (*stack_head)->type!=ref) |
if(check_args(env, 1, unknown)) |
627 |
|
return printerr(env); |
628 |
|
|
629 |
|
switch(CAR(env->head)->type) { |
630 |
|
/* if it's a symbol */ |
631 |
|
case symb: |
632 |
|
env->errsymb= CAR(env->head)->content.sym->id; |
633 |
|
rcl(env); /* get its contents */ |
634 |
|
if(env->err) return; |
635 |
|
if(CAR(env->head)->type!=symb){ /* don't recurse symbols */ |
636 |
|
goto eval_start; |
637 |
|
} |
638 |
return; |
return; |
639 |
|
|
640 |
if(((stackitem*)(*stack_head)->content.ptr)->type==func) { |
/* If it's a lone function value, run it */ |
641 |
in_func= (funcp)((stackitem*)(*stack_head)->content.ptr)->content.ptr; |
case func: |
642 |
toss(stack_head); |
in_func= CAR(env->head)->content.func; |
643 |
(*in_func)(stack_head); |
env->head= CDR(env->head); |
644 |
|
return in_func((void*)env); |
645 |
|
|
646 |
|
/* If it's a list */ |
647 |
|
case tcons: |
648 |
|
temp_val= CAR(env->head); |
649 |
|
protect(temp_val); |
650 |
|
|
651 |
|
env->head= CDR(env->head); |
652 |
|
iterator= temp_val; |
653 |
|
|
654 |
|
while(iterator->type != empty) { |
655 |
|
push_val(env, CAR(iterator)); |
656 |
|
|
657 |
|
if(CAR(env->head)->type==symb |
658 |
|
&& CAR(env->head)->content.sym->id[0]==';') { |
659 |
|
env->head= CDR(env->head); |
660 |
|
|
661 |
|
if(CDR(iterator)->type == empty){ |
662 |
|
goto eval_start; |
663 |
|
} |
664 |
|
eval(env); |
665 |
|
if(env->err) return; |
666 |
|
} |
667 |
|
if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons) |
668 |
|
iterator= CDR(iterator); |
669 |
|
else { |
670 |
|
env->err= 2; /* Improper list */ |
671 |
|
return printerr(env); |
672 |
|
} |
673 |
|
} |
674 |
|
unprotect(temp_val); |
675 |
|
return; |
676 |
|
|
677 |
|
case empty: |
678 |
|
env->head= CDR(env->head); |
679 |
|
case integer: |
680 |
|
case tfloat: |
681 |
|
case string: |
682 |
|
case port: |
683 |
|
case unknown: |
684 |
return; |
return; |
685 |
} |
} |
686 |
} |
} |
687 |
|
|
688 |
int stack_read(stackitem** stack_head, hashtbl in_hash, char* in_line) |
|
689 |
|
/* Internal forget function */ |
690 |
|
void forget_sym(symbol **hash_entry) |
691 |
{ |
{ |
692 |
char *temp, *rest; |
symbol *temp; |
|
int itemp; |
|
|
size_t inlength= strlen(in_line)+1; |
|
|
int convert= 0; |
|
|
|
|
|
temp= malloc(inlength); |
|
|
rest= malloc(inlength); |
|
|
|
|
|
if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest)) >= 1) |
|
|
push_cstring(stack_head, temp); |
|
|
else if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest)) >= 1) |
|
|
push_val(stack_head, itemp); |
|
|
else if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest)) >= 1) |
|
|
push_ref(stack_head, in_hash, temp); |
|
|
else if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) >= 1) |
|
|
if(*temp==';') |
|
|
eval(stack_head); |
|
693 |
|
|
694 |
|
temp= *hash_entry; |
695 |
|
*hash_entry= (*hash_entry)->next; |
696 |
|
|
697 |
|
free(temp->id); |
698 |
free(temp); |
free(temp); |
699 |
|
} |
700 |
|
|
701 |
if(convert<2) { |
|
702 |
free(rest); |
int main(int argc, char **argv) |
703 |
return 0; |
{ |
704 |
} |
environment myenv; |
705 |
|
int c; /* getopt option character */ |
706 |
stack_read(stack_head, in_hash, rest); |
|
707 |
|
#ifdef __linux__ |
708 |
|
mtrace(); |
709 |
|
#endif |
710 |
|
|
711 |
|
init_env(&myenv); |
712 |
|
|
713 |
|
myenv.interactive = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO); |
714 |
|
|
715 |
|
while ((c = getopt (argc, argv, "i")) != -1) |
716 |
|
switch (c) |
717 |
|
{ |
718 |
|
case 'i': |
719 |
|
myenv.interactive = 1; |
720 |
|
break; |
721 |
|
case '?': |
722 |
|
fprintf (stderr, |
723 |
|
"Unknown option character '\\x%x'.\n", |
724 |
|
optopt); |
725 |
|
return EX_USAGE; |
726 |
|
default: |
727 |
|
abort (); |
728 |
|
} |
729 |
|
|
730 |
free(rest); |
if (optind < argc) { |
731 |
return 1; |
myenv.interactive = 0; |
732 |
|
myenv.inputstream= fopen(argv[optind], "r"); |
733 |
|
if(myenv.inputstream== NULL) { |
734 |
|
perror(argv[0]); |
735 |
|
exit (EX_NOINPUT); |
736 |
|
} |
737 |
|
} |
738 |
|
|
739 |
|
if(myenv.interactive) |
740 |
|
puts(start_message); |
741 |
|
|
742 |
|
while(1) { |
743 |
|
if(myenv.in_string==NULL) { |
744 |
|
if (myenv.interactive) { |
745 |
|
if(myenv.err) { |
746 |
|
printf("(error %d)\n", myenv.err); |
747 |
|
myenv.err= 0; |
748 |
|
} |
749 |
|
printf("\n"); |
750 |
|
printstack(&myenv); |
751 |
|
printf("> "); |
752 |
|
} |
753 |
|
myenv.err=0; |
754 |
|
} |
755 |
|
readstream(&myenv, myenv.inputstream); |
756 |
|
if (myenv.err) { /* EOF or other error */ |
757 |
|
myenv.err=0; |
758 |
|
quit(&myenv); |
759 |
|
} else if(myenv.head->type!=empty |
760 |
|
&& CAR(myenv.head)->type==symb |
761 |
|
&& CAR(myenv.head)->content.sym->id[0] == ';') { |
762 |
|
if(myenv.head->type != empty) |
763 |
|
myenv.head= CDR(myenv.head); |
764 |
|
eval(&myenv); |
765 |
|
} else { |
766 |
|
gc_maybe(&myenv); |
767 |
|
} |
768 |
|
} |
769 |
|
quit(&myenv); |
770 |
|
return EXIT_FAILURE; |
771 |
} |
} |
772 |
|
|
773 |
extern void print(stackitem** stack_head) |
|
774 |
|
/* Return copy of a value */ |
775 |
|
value *copy_val(environment *env, value *old_value) |
776 |
{ |
{ |
777 |
if((*stack_head)==NULL) |
value *new_value; |
778 |
return; |
|
779 |
|
if(old_value==NULL) |
780 |
|
return NULL; |
781 |
|
|
782 |
switch((*stack_head)->type){ |
new_value= new_val(env); |
783 |
case value: |
new_value->type= old_value->type; |
784 |
printf("%d", (*stack_head)->content.val); |
|
785 |
|
switch(old_value->type){ |
786 |
|
case tfloat: |
787 |
|
case integer: |
788 |
|
case func: |
789 |
|
case symb: |
790 |
|
case empty: |
791 |
|
case unknown: |
792 |
|
case port: |
793 |
|
new_value->content= old_value->content; |
794 |
break; |
break; |
795 |
case string: |
case string: |
796 |
printf("%s", (char*)(*stack_head)->content.ptr); |
new_value->content.string= strdup(old_value->content.string); |
|
break; |
|
|
case ref: |
|
|
printf("%s", ((stackitem*)(*stack_head)->content.ptr)->id); |
|
797 |
break; |
break; |
798 |
case symbol: |
case tcons: |
799 |
default: |
|
800 |
printf("%p", (*stack_head)->content.ptr); |
new_value->content.c= malloc(sizeof(pair)); |
801 |
|
assert(new_value->content.c!=NULL); |
802 |
|
env->gc_count += sizeof(pair); |
803 |
|
|
804 |
|
CAR(new_value)= copy_val(env, CAR(old_value)); /* recurse */ |
805 |
|
CDR(new_value)= copy_val(env, CDR(old_value)); /* recurse */ |
806 |
break; |
break; |
807 |
} |
} |
808 |
|
|
809 |
toss(stack_head); |
return new_value; |
810 |
} |
} |
811 |
|
|
812 |
extern void pack(stackitem** stack_head) |
|
813 |
|
/* read a line from a stream; used by readline */ |
814 |
|
void readlinestream(environment *env, FILE *stream) |
815 |
{ |
{ |
816 |
void* delimiter; |
char in_string[101]; |
|
stackitem *iterator, *temp, *pack; |
|
817 |
|
|
818 |
if((*stack_head)==NULL) |
if(fgets(in_string, 100, stream)==NULL) { |
819 |
return; |
push_cstring(env, ""); |
820 |
|
if (! feof(stream)){ |
821 |
|
env->err= 5; |
822 |
|
return printerr(env); |
823 |
|
} |
824 |
|
} else { |
825 |
|
push_cstring(env, in_string); |
826 |
|
} |
827 |
|
} |
828 |
|
|
|
delimiter= (*stack_head)->content.ptr; |
|
|
toss(stack_head); |
|
829 |
|
|
830 |
iterator= *stack_head; |
/* Reverse (flip) a list */ |
831 |
|
extern void rev(environment *env) |
832 |
|
{ |
833 |
|
value *old_head, *new_head, *item; |
834 |
|
|
835 |
while(iterator->next!=NULL && iterator->next->content.ptr!=delimiter) |
if(CAR(env->head)->type==empty) |
836 |
iterator= iterator->next; |
return; /* Don't reverse an empty list */ |
837 |
|
|
838 |
|
if(check_args(env, 1, tcons)) |
839 |
|
return printerr(env); |
840 |
|
|
841 |
|
old_head= CAR(env->head); |
842 |
|
new_head= new_val(env); |
843 |
|
while(old_head->type != empty) { |
844 |
|
item= old_head; |
845 |
|
old_head= CDR(old_head); |
846 |
|
CDR(item)= new_head; |
847 |
|
new_head= item; |
848 |
|
} |
849 |
|
CAR(env->head)= new_head; |
850 |
|
} |
851 |
|
|
|
temp= *stack_head; |
|
|
*stack_head= iterator->next; |
|
|
iterator->next= NULL; |
|
|
|
|
|
if(*stack_head!=NULL && (*stack_head)->content.ptr==delimiter) |
|
|
toss(stack_head); |
|
852 |
|
|
853 |
pack= malloc(sizeof(stackitem)); |
/* Make a list. */ |
854 |
pack->type= list; |
extern void pack(environment *env) |
855 |
pack->content.ptr= temp; |
{ |
856 |
|
value *iterator, *temp, *ending; |
857 |
|
|
858 |
|
ending=new_val(env); |
859 |
|
|
860 |
|
iterator= env->head; |
861 |
|
if(iterator->type == empty |
862 |
|
|| (CAR(iterator)->type==symb |
863 |
|
&& CAR(iterator)->content.sym->id[0]=='[')) { |
864 |
|
temp= ending; |
865 |
|
if(env->head->type != empty) |
866 |
|
env->head= CDR(env->head); |
867 |
|
} else { |
868 |
|
/* Search for first delimiter */ |
869 |
|
while(CDR(iterator)->type != empty |
870 |
|
&& (CAR(CDR(iterator))->type!=symb |
871 |
|
|| CAR(CDR(iterator))->content.sym->id[0]!='[')) |
872 |
|
iterator= CDR(iterator); |
873 |
|
|
874 |
|
/* Extract list */ |
875 |
|
temp= env->head; |
876 |
|
env->head= CDR(iterator); |
877 |
|
CDR(iterator)= ending; |
878 |
|
|
879 |
|
if(env->head->type != empty) |
880 |
|
env->head= CDR(env->head); |
881 |
|
} |
882 |
|
|
883 |
|
/* Push list */ |
884 |
|
|
885 |
push(stack_head, pack); |
push_val(env, temp); |
886 |
|
rev(env); |
887 |
} |
} |
888 |
|
|
889 |
|
|
890 |
|
/* read from a stream; used by "read" and "readport" */ |
891 |
|
void readstream(environment *env, FILE *stream) |
892 |
|
{ |
893 |
|
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n"; |
894 |
|
const char strform[]= "\"%[^\"]\"%n"; |
895 |
|
const char intform[]= "%i%n"; |
896 |
|
const char fltform[]= "%f%n"; |
897 |
|
const char blankform[]= "%*[ \t]%n"; |
898 |
|
const char ebrackform[]= "]%n"; |
899 |
|
const char semicform[]= ";%n"; |
900 |
|
const char bbrackform[]= "[%n"; |
901 |
|
|
902 |
|
int itemp, readlength= -1; |
903 |
|
int count= -1; |
904 |
|
float ftemp; |
905 |
|
static int depth= 0; |
906 |
|
char *match; |
907 |
|
size_t inlength; |
908 |
|
|
909 |
|
if(env->in_string==NULL) { |
910 |
|
if(depth > 0 && env->interactive) { |
911 |
|
printf("]> "); |
912 |
|
} |
913 |
|
readlinestream(env, env->inputstream); |
914 |
|
if(env->err) return; |
915 |
|
|
916 |
|
if((CAR(env->head)->content.string)[0]=='\0'){ |
917 |
|
env->err= 4; /* "" means EOF */ |
918 |
|
return; |
919 |
|
} |
920 |
|
|
921 |
|
env->in_string= malloc(strlen(CAR(env->head)->content.string)+1); |
922 |
|
assert(env->in_string != NULL); |
923 |
|
env->free_string= env->in_string; /* Save the original pointer */ |
924 |
|
strcpy(env->in_string, CAR(env->head)->content.string); |
925 |
|
env->head= CDR(env->head); |
926 |
|
} |
927 |
|
|
928 |
|
inlength= strlen(env->in_string)+1; |
929 |
|
match= malloc(inlength); |
930 |
|
assert(match != NULL); |
931 |
|
|
932 |
|
if(sscanf(env->in_string, blankform, &readlength) != EOF |
933 |
|
&& readlength != -1) { |
934 |
|
; |
935 |
|
} else if(sscanf(env->in_string, fltform, &ftemp, &readlength) != EOF |
936 |
|
&& readlength != -1) { |
937 |
|
if(sscanf(env->in_string, intform, &itemp, &count) != EOF |
938 |
|
&& count==readlength) { |
939 |
|
push_int(env, itemp); |
940 |
|
} else { |
941 |
|
push_float(env, ftemp); |
942 |
|
} |
943 |
|
} else if(sscanf(env->in_string, "\"\"%n", &readlength) != EOF |
944 |
|
&& readlength != -1) { |
945 |
|
push_cstring(env, ""); |
946 |
|
} else if(sscanf(env->in_string, strform, match, &readlength) != EOF |
947 |
|
&& readlength != -1) { |
948 |
|
push_cstring(env, match); |
949 |
|
} else if(sscanf(env->in_string, symbform, match, &readlength) != EOF |
950 |
|
&& readlength != -1) { |
951 |
|
push_sym(env, match); |
952 |
|
} else if(sscanf(env->in_string, ebrackform, &readlength) != EOF |
953 |
|
&& readlength != -1) { |
954 |
|
pack(env); if(env->err) return; |
955 |
|
if(depth != 0) depth--; |
956 |
|
} else if(sscanf(env->in_string, semicform, &readlength) != EOF |
957 |
|
&& readlength != -1) { |
958 |
|
push_sym(env, ";"); |
959 |
|
} else if(sscanf(env->in_string, bbrackform, &readlength) != EOF |
960 |
|
&& readlength != -1) { |
961 |
|
push_sym(env, "["); |
962 |
|
depth++; |
963 |
|
} else { |
964 |
|
free(env->free_string); |
965 |
|
env->in_string = env->free_string = NULL; |
966 |
|
} |
967 |
|
if (env->in_string != NULL) { |
968 |
|
env->in_string += readlength; |
969 |
|
} |
970 |
|
|
971 |
extern void nl() |
free(match); |
|
{ |
|
|
printf("\n"); |
|
|
} |
|
972 |
|
|
973 |
extern void quit() |
if(depth) |
974 |
{ |
return readstream(env, env->inputstream); |
|
exit(EXIT_SUCCESS); |
|
975 |
} |
} |
976 |
|
|
977 |
int main() |
|
978 |
|
int check_args(environment *env, int num_args, ...) |
979 |
{ |
{ |
980 |
stackitem* s= NULL; |
va_list ap; |
981 |
hashtbl myhash; |
enum type_enum mytype; |
982 |
char in_string[100]; |
int i; |
983 |
|
|
984 |
init_hashtbl(myhash); |
value *iter= env->head; |
985 |
|
int errval= 0; |
986 |
|
|
987 |
printf("okidok\n "); |
va_start(ap, num_args); |
988 |
|
for(i=1; i<=num_args; i++) { |
989 |
|
mytype= va_arg(ap, enum type_enum); |
990 |
|
// fprintf(stderr, "%s\n", env->errsymb); |
991 |
|
|
992 |
while(fgets(in_string, 100, stdin) != NULL) { |
if(iter->type==empty || iter==NULL) { |
993 |
stack_read(&s, myhash, in_string); |
errval= 1; |
994 |
printf("okidok\n "); |
break; |
995 |
|
} |
996 |
|
|
997 |
|
if(mytype!=unknown && CAR(iter)->type!=mytype) { |
998 |
|
errval= 2; |
999 |
|
break; |
1000 |
|
} |
1001 |
|
|
1002 |
|
iter= CDR(iter); |
1003 |
} |
} |
1004 |
|
|
1005 |
|
va_end(ap); |
1006 |
|
|
1007 |
return EXIT_SUCCESS; |
env->err= errval; |
1008 |
|
return errval; |
1009 |
} |
} |
|
|
|
|
/* Local Variables: */ |
|
|
/* compile-command:"make CFLAGS=\"-Wall -g -rdynamic -ldl\" stack" */ |
|
|
/* End: */ |
|