File: sexp.c

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/* vfsexp.c - a module for handling s-expressions
 *
 *  Programmmed by Hirotsugu Kakugawa
 *  E-Mail:  h.kakugawa@computer.org
 *
 *  Edition History
 *   7 Jan 1998  First implementation
 *   2 May 1998  Fix a bug to fail reading a string ""
 *  24 Jun 1998  Added a function to read an s-exp from string stream.
 */

/*
 * Copyright (C) 1997-1998 Hirotsugu Kakugawa. 
 * All rights reserved.
 *
 * This file is part of the VFlib Library.  This library is free
 * software; you can redistribute it and/or modify it under the terms of
 * the GNU Library General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  This library is distributed in the hope
 * that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU Library General Public License for more details.
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include  "config.h"
#include  <stdio.h>
#include  <stdlib.h>
#ifdef HAVE_UNISTD_H
#  include <unistd.h>
#endif
#if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
#  include  <string.h>
#else
#  include  <strings.h>
#endif
#include  <ctype.h>

#include "sexp.h"
#include "mem.h"

#define TRUE   (1==1)
#define FALSE  (1==0)

static SEXP   vf_sexp_alloc(int tag);
static void   vf_sexp_obj_validate(SEXP s1);
static void   vf_sexp_obj_validate2(SEXP s1, SEXP s2);



/*
 * Basic Functions 
 */

SEXP
vf_sexp_cons(SEXP car, SEXP cdr)
{
  SEXP  cell;

  vf_sexp_obj_validate2(car, cdr);

  cell = vf_sexp_alloc(VF_SEXP_TAG_CONS);
  if (cell == NULL)
    return NULL;

  cell->t.cons.car = car;
  cell->t.cons.cdr = cdr;

  return cell;
}

SEXP
vf_sexp_car(SEXP s)
{
  vf_sexp_obj_validate(s);
  if (s->tag != VF_SEXP_TAG_CONS){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_car()]: %s\n",
	    "arg type error");
    abort();
  }

  return s->t.cons.car;
}

SEXP
vf_sexp_cdr(SEXP s)
{
  vf_sexp_obj_validate(s);
  if (s->tag != VF_SEXP_TAG_CONS){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_cdr()]: %s\n",
	    "arg type error");
    abort();
  }

  return s->t.cons.cdr;
}

SEXP
vf_sexp_caar(SEXP s)
{
  vf_sexp_obj_validate(s);
  if ((s->tag != VF_SEXP_TAG_CONS)
      || ((s->t.cons.car)->tag != VF_SEXP_TAG_CONS)){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_caar()]: %s\n",
	    "arg type error");
    abort();
  }
  vf_sexp_obj_validate(s->t.cons.car);

  return (s->t.cons.car)->t.cons.car;
}

SEXP
vf_sexp_cadr(SEXP s)
{
  vf_sexp_obj_validate(s);
  if ((s->tag != VF_SEXP_TAG_CONS)
      || ((s->t.cons.cdr)->tag != VF_SEXP_TAG_CONS)){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_cadr()]: %s\n",
	    "arg type error");
    abort();
  }
  vf_sexp_obj_validate(s->t.cons.cdr);

  return (s->t.cons.cdr)->t.cons.car;
}

SEXP
vf_sexp_cdar(SEXP s)
{
  vf_sexp_obj_validate(s);
  if ((s->tag != VF_SEXP_TAG_CONS)
      || ((s->t.cons.car)->tag != VF_SEXP_TAG_CONS)){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_cdar()]: %s\n",
	    "arg type error");
    abort();
  }
  vf_sexp_obj_validate(s->t.cons.car);

  return (s->t.cons.car)->t.cons.cdr;
}

SEXP
vf_sexp_cddr(SEXP s)
{
  vf_sexp_obj_validate(s);
  if ((s->tag != VF_SEXP_TAG_CONS)
      || ((s->t.cons.cdr)->tag != VF_SEXP_TAG_CONS)){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_cddr()]: %s\n",
	    "arg type error");
    abort();
  }
  vf_sexp_obj_validate(s->t.cons.cdr);

  return (s->t.cons.cdr)->t.cons.cdr;
}

SEXP
vf_sexp_caddr(SEXP s)
{
  vf_sexp_obj_validate(s);
  if ((s->tag != VF_SEXP_TAG_CONS)
      || ((s->t.cons.cdr)->tag != VF_SEXP_TAG_CONS)
      || (((s->t.cons.cdr)->t.cons.cdr)->tag != VF_SEXP_TAG_CONS)){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_caddr()]: %s\n",
	    "arg type error");
    abort();
  }
  vf_sexp_obj_validate(s->t.cons.cdr);
  vf_sexp_obj_validate((s->t.cons.cdr)->t.cons.cdr);

  return ((s->t.cons.cdr)->t.cons.cdr)->t.cons.car;
}

void
vf_sexp_rplaca(SEXP s, SEXP val)
{
  vf_sexp_obj_validate2(s, val);
  if (s->tag != VF_SEXP_TAG_CONS){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_rplaca()]: %s\n",
	    "arg type error");
    abort();
  }

  s->t.cons.car = val;
}

void
vf_sexp_rplacd(SEXP s, SEXP val)
{
  vf_sexp_obj_validate2(s, val);
  if (s->tag != VF_SEXP_TAG_CONS){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_rplacd()]: %s\n",
	    "arg type error");
    abort();
  }

  s->t.cons.cdr = val;
}

int
vf_sexp_atom(SEXP s)
{
  if (s == NULL)
    return FALSE;
  vf_sexp_obj_validate(s);

  return (s->tag != VF_SEXP_TAG_CONS);
}

int
vf_sexp_null(SEXP s)
{
  if (s == NULL)
    return FALSE;
  vf_sexp_obj_validate(s);

  return (s->tag == VF_SEXP_TAG_NIL);
}

int
vf_sexp_consp(SEXP s)
{
  if (s == NULL)
    return FALSE;
  vf_sexp_obj_validate(s);

  return (s->tag == VF_SEXP_TAG_CONS);
}

int
vf_sexp_stringp(SEXP s)
{
  if (s == NULL)
    return FALSE;

  vf_sexp_obj_validate(s);
  return (((s->tag == VF_SEXP_TAG_STRING) || (s->tag == VF_SEXP_TAG_SYMBOL))
	  && (s->t.str != NULL));
}

char*
vf_sexp_get_cstring(SEXP s)
{
  vf_sexp_obj_validate(s);
  if (!vf_sexp_stringp(s)){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_get_cstring()]: %s\n",
	    "arg type error");
    abort();
  }

  return s->t.str;
}

int
vf_sexp_listp(SEXP s)
{
  if (s == NULL)
    return FALSE;
  vf_sexp_obj_validate(s);

  if (vf_sexp_null(s))
    return TRUE;

  return (s->tag == VF_SEXP_TAG_CONS);
  /* Since our s-exp reader does not support 'dot-notation',
     all cons data forms a list. */
}

int
vf_sexp_alistp(SEXP_ALIST s)
{
  SEXP  t;

  if (vf_sexp_null(s))
    return TRUE;
  if (!vf_sexp_listp(s))
    return FALSE;

  for (t = s; t->tag == VF_SEXP_TAG_CONS; t = t->t.cons.cdr){
    if (!vf_sexp_listp(t->t.cons.car))
      return FALSE;
  }    
  return (t->tag == VF_SEXP_TAG_NIL);
}

int
vf_sexp_member(char* key, SEXP_LIST s)
{
  SEXP  t;

  /* vf_sexp_member[(a b c ...), x] => True/False */

  if (!vf_sexp_listp(s))
    return FALSE;
  for (t = s; t->tag == VF_SEXP_TAG_CONS; t = t->t.cons.cdr){
    if (((t->tag == VF_SEXP_TAG_STRING) || (t->tag == VF_SEXP_TAG_SYMBOL))
	&& (t->t.str != NULL) && (strcmp(key, t->t.str) == 0))
      return TRUE;
  }    
  return FALSE;
}

SEXP
vf_sexp_alist_put(char *key, char *val, SEXP_ALIST alist)
{
  SEXP  sk, sv, t, v;

  if (!vf_sexp_alistp(alist))
    return NULL;
  if (key == NULL)
    key = ""; 
  if (val == NULL)
    val = ""; 

  sk = vf_sexp_cstring2string(key);
  sv = vf_sexp_cstring2string(val);
  t = vf_sexp_list2(sk, sv);
  v =  vf_sexp_cons(t, alist);

  return v;
}

SEXP
vf_sexp_assoc(char* key, SEXP s)
{
  SEXP  t, pair;

  /* vf_sexp_assoc[((p1 v1 ...) (p2 v2 ...)  ...), pi] => (pi vi ...) */

  if ((key == NULL) || (s == NULL))
    return NULL;
  if (!vf_sexp_alistp(s))
    return NULL;

  for (t = s; (t != NULL) && (t->tag == VF_SEXP_TAG_CONS); t = t->t.cons.cdr){
    if (t->t.cons.car == NULL)
      continue;
    pair = t->t.cons.car;
    if (vf_sexp_stringp(vf_sexp_car(pair))
	&& (strcmp(key, vf_sexp_get_cstring(vf_sexp_car(pair))) == 0))
      return pair;
  }

  return NULL;
}

int
vf_sexp_length(SEXP s)
{
  int   len;
  SEXP  t;

  if (!vf_sexp_listp(s))
    return 0;
  len = 0;
  for (t = s; t->tag == VF_SEXP_TAG_CONS; t = t->t.cons.cdr)
    len++;
  return len;
}

SEXP
vf_sexp_list1(SEXP s)
{
  return vf_sexp_cons(s, vf_sexp_empty_list());
}

SEXP
vf_sexp_list2(SEXP s1, SEXP s2)
{
  return vf_sexp_cons(s1, vf_sexp_cons(s2, vf_sexp_empty_list()));
}

SEXP
vf_sexp_copy(SEXP s)
{
  SEXP  cp, car, cdr;

  if (s == NULL)
    return NULL;
  vf_sexp_obj_validate(s);

  cp = vf_sexp_alloc(s->tag);
  if (cp == NULL)
    return NULL;

  switch (s->tag){
  default:
    return NULL;
  case VF_SEXP_TAG_NIL:
    break;
  case VF_SEXP_TAG_CONS:
    car = vf_sexp_copy(s->t.cons.car);
    cdr = vf_sexp_copy(s->t.cons.cdr);
    if ((car == NULL) || (cdr == NULL)){
      if (car != NULL)
	vf_sexp_free(&car);
      if (cdr != NULL)
	vf_sexp_free(&cdr);
      return NULL;
    }
    cp->t.cons.car = car;
    cp->t.cons.cdr = cdr;
    break;
  case VF_SEXP_TAG_STRING:
  case VF_SEXP_TAG_SYMBOL:
    if (s->t.str == NULL)
      goto Error;
    if ((cp->t.str = (char*)malloc(strlen(s->t.str)+1)) == NULL)
      goto Error;
    strcpy(cp->t.str, s->t.str);
    break;
  }
  return cp;

 Error:
  vf_sexp_free(&cp);
  return NULL;
}

void
vf_sexp_nconc(SEXP s1, SEXP s2)
{
  SEXP  t, tt;

  if (s2 == NULL)
    return;
  if (s1 == NULL)
    return;

  if (!vf_sexp_listp(s1) && !vf_sexp_listp(s2)){
    fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_nconc()]: %s\n",
	    "args type");
    return;
  }

  if (vf_sexp_null(s2))
    return;

  t = s1;
  while (vf_sexp_consp(vf_sexp_cdr(t)))
    t = vf_sexp_cdr(t);
  tt = vf_sexp_cdr(t);
  vf_sexp_free(&tt);
  vf_sexp_rplacd(t, s2);
}

SEXP
vf_sexp_empty_list(void)
{
  return vf_sexp_alloc(VF_SEXP_TAG_NIL);
}

SEXP
vf_sexp_getf(SEXP s, char *key) 
{
  SEXP t;

  for (t = s; t->tag == VF_SEXP_TAG_CONS; t = t->t.cons.cdr){
    if (vf_sexp_stringp(t->t.cons.car) && 
	strcmp (key, vf_sexp_get_cstring (t->t.cons.car)) == 0){
      return t->t.cons.cdr;
    }
  }
  return NULL;
}



/* 
 * Pretty Print
 */
static void  vf_sexp_pp2(FILE *fp, SEXP s, int depth, int need_indent, 
			 int vflibcap_entry_flag);

void
vf_sexp_pp(SEXP s)
{
  vf_sexp_pp2(stdout, s, 0, 1, 0);
  fprintf(stdout, "\n");
}

void
vf_sexp_pp_fp(SEXP s, FILE *fp)
{
  vf_sexp_pp2(fp, s, 0, 1, 0);
  fprintf(fp, "\n");
}

void
vf_sexp_pp_entry(SEXP s)
{
  vf_sexp_pp2(stdout, s, 0, 1, 1);
  fprintf(stdout, "\n");
}

void
vf_sexp_pp_entry_fp(SEXP s, FILE *fp)
{
  vf_sexp_pp2(fp, s, 0, 1, 1);
  fprintf(fp, "\n");
}


static void
vf_sexp_pp2(FILE *fp, SEXP s, int depth, int need_indent,
	    int vflibcap_entry_flag)
{
  SEXP  t, u;
  char  *p;
  int   i;

  vf_sexp_obj_validate(s);
  if ((need_indent == 1) && (depth > 0)){
    fprintf(fp, "\n");
    for (i = 0; i < depth; i++) 
      fprintf(fp, "    ");
  }

  switch (s->tag){
  default:
    fprintf(stderr, "VFlib: Unknown sexp object %p", (void*)s);
    abort();
  case VF_SEXP_TAG_NIL:
    fprintf(fp, "()");
    break;
  case VF_SEXP_TAG_STRING:
  case VF_SEXP_TAG_SYMBOL:
    if (s->tag == VF_SEXP_TAG_STRING)
      fprintf(fp, "\"");
    for (p = s->t.str; *p != '\0'; p++){
      if (*p == '"'){
	fprintf(fp, "\\\"");
      } else if (!iscntrl((int)(*p))){
	fprintf(fp, "%c", *p);
      } else {
	switch (*p){
	case '\a':  fprintf(fp, "\\a"); break;
	case '\b':  fprintf(fp, "\\b"); break;
	case '\f':  fprintf(fp, "\\f"); break;
	case '\n':  fprintf(fp, "\\n"); break;
	case '\r':  fprintf(fp, "\\r"); break;
	case '\t':  fprintf(fp, "\\t"); break;
	case '\v':  fprintf(fp, "\\v"); break;
	default:    fprintf(fp, "\\x%02x", *p);
	}
      }
    }
    if (s->tag == VF_SEXP_TAG_STRING)
      fprintf(fp, "\"");
    break;
  case VF_SEXP_TAG_CONS:
#if 1
    fprintf(fp, "(");
    if ((depth == 0) && (vf_sexp_length(s) > 2)
	&& (vflibcap_entry_flag == 1)
	&& (vf_sexp_stringp(vf_sexp_car(s)))
	&& (vf_sexp_stringp(vf_sexp_car(vf_sexp_cdr(s)))) ){
      vf_sexp_pp2(fp, vf_sexp_car(s), depth+1, 0, vflibcap_entry_flag);
      fprintf(fp, " ");
      vf_sexp_pp2(fp, vf_sexp_car(vf_sexp_cdr(s)), depth+1, 0, 
		  vflibcap_entry_flag);
      for (t = vf_sexp_cdr(vf_sexp_cdr(s));
	   vf_sexp_consp(t); 
	   t = vf_sexp_cdr(t)){
	if (vf_sexp_stringp(vf_sexp_car(t))){
	  vf_sexp_pp2(fp, vf_sexp_car(t), depth+1, 1, 0);
	} else {
	  fprintf(fp, "\n    (%s", vf_sexp_get_cstring(vf_sexp_caar(t)));
	  for (u = vf_sexp_cdar(t); vf_sexp_consp(u); u = vf_sexp_cdr(u)){
	    vf_sexp_pp2(fp, vf_sexp_car(u), depth+2, 1, 0);
	  }
	  fprintf(fp, ")");
	}
      }
    } else {
      vf_sexp_pp2(fp, vf_sexp_car(s), depth+1, 0, vflibcap_entry_flag);
      for (t = vf_sexp_cdr(s); vf_sexp_consp(t); t = vf_sexp_cdr(t)){
	fprintf(fp, " ");
	vf_sexp_pp2(fp, vf_sexp_car(t), depth+1, 0, vflibcap_entry_flag);
      }
    }
    fprintf(fp, ")");
#else
    fprintf(fp, "(");
      vf_sexp_pp2(fp, vf_sexp_car(s), depth+1, vflibcap_entry_flag);
      for (t = vf_sexp_cdr(s); vf_sexp_consp(t); t = vf_sexp_cdr(t)){
	fprintf(fp, " ");
	vf_sexp_pp2(fp, vf_sexp_car(t), depth+1, 0, vflibcap_entry_flag);
      }
    fprintf(fp, ")");
#endif
    break;
  }
}


/*
 * S-Expression Reader
 */

typedef struct s_sexp_stream  *SEXP_STREAM;
struct s_sexp_stream {
  int   ungetc_buff;
  void  *obj;
  void  *data1;
  void  *data2;
  int   (*get_char)(SEXP_STREAM stream);
  void  (*unget_char)(SEXP_STREAM stream, int ch);
};
#define SEXP_STREAM_GETC(stream)          (stream->get_char)(stream)
#define SEXP_STREAM_UNGETC(stream,ch)     (stream->unget_char)(stream,ch)

static SEXP  vf_sexp_read_from_stream(SEXP_STREAM);


static int   string_stream_get_char(SEXP_STREAM);
static void  string_stream_unget_char(SEXP_STREAM,int);

SEXP
vf_sexp_read_from_string_stream(char *str)
{
  struct s_sexp_stream   stream_obj;

  stream_obj.ungetc_buff = -1;
  stream_obj.obj         = str;
  stream_obj.data1       = str;
  stream_obj.get_char    = string_stream_get_char;
  stream_obj.unget_char  = string_stream_unget_char;
  return vf_sexp_read_from_stream(&stream_obj);
}

static int
string_stream_get_char(SEXP_STREAM stream)
{
  int   ch;
  char *p;

  if (stream->ungetc_buff >= 0){
    ch = stream->ungetc_buff;
    stream->ungetc_buff = -1;
    return ch;
  }

  stream->ungetc_buff = -1;
  p = stream->data1;
  if ((ch = *p) == '\0')
    return EOF;
  p++;
  stream->data1 = p;
  return ch;
}

static void
string_stream_unget_char(SEXP_STREAM stream, int ch)
{
  stream->ungetc_buff = ch;
}


static int   file_stream_get_char(SEXP_STREAM);
static void  file_stream_unget_char(SEXP_STREAM,int);

SEXP
vf_sexp_read_from_file_stream(FILE *fp)
{
  struct s_sexp_stream   stream_obj;

  stream_obj.ungetc_buff = -1;
  stream_obj.obj         = fp;
  stream_obj.get_char    = file_stream_get_char;
  stream_obj.unget_char  = file_stream_unget_char;
  return vf_sexp_read_from_stream(&stream_obj);
}

SEXP
vf_sexp_read(FILE *fp)
{
  return vf_sexp_read_from_file_stream(fp);
}

static int
file_stream_get_char(SEXP_STREAM stream)
{
  int   ch;
  FILE  *fp;

  if (stream->ungetc_buff >= 0){
    ch = stream->ungetc_buff;
    stream->ungetc_buff = -1;
    return ch;
  }

  stream->ungetc_buff = -1;
  fp = stream->obj;
  return getc(fp);
}

static void
file_stream_unget_char(SEXP_STREAM stream, int ch)
{
  stream->ungetc_buff = ch;
}



static int  vf_sexp_do_read_from_stream(SEXP_STREAM stream, SEXP sexp);
static int  vf_sexp_read_str(SEXP_STREAM stream, char ch, SEXP sexp);
static int  vf_sexp_skip(SEXP_STREAM stream);
static char vf_get_char_esc(char **pp, SEXP_STREAM stream);
#define  NBUFFER_MIN    2*1024
#define  NBUFFER_MED    4*1024
#define  NBUFFER_MAX   16*1024

static SEXP
vf_sexp_read_from_stream(SEXP_STREAM stream)
{
  SEXP  s;

  if ((s = vf_sexp_alloc(VF_SEXP_TAG_NIL)) == NULL)
    return NULL;
  if (vf_sexp_do_read_from_stream(stream, s) < 0){
    vf_sexp_free(&s);
    return NULL;
  }
  return s; 
}

static int
vf_sexp_do_read_from_stream(SEXP_STREAM stream, SEXP s)
{
  int   ch;
  
  ch = vf_sexp_skip(stream);
  if (ch < 0)
    return -1;
  
  if (ch == '('){                   /* cons or nil */
    s->tag = VF_SEXP_TAG_NIL;
    for (;;){
      ch = vf_sexp_skip(stream);
      if (ch < 0)
	return -1;
      if (ch == ')')    /* nil */
	break;
      SEXP_STREAM_UNGETC(stream, ch);   /* cons */

      s->tag = VF_SEXP_TAG_CONS;
      s->t.cons.car = NULL;
      s->t.cons.cdr = NULL;
      if ((s->t.cons.car = vf_sexp_alloc(VF_SEXP_TAG_NIL)) == NULL)
	return -1;
      if ((s->t.cons.cdr = vf_sexp_alloc(VF_SEXP_TAG_NIL)) == NULL)
	return -1;
      if (vf_sexp_do_read_from_stream(stream, s->t.cons.car) < 0){
	fprintf(stderr, "VFlib: Broken vflibcap file - unexpected EOF\n");
	return -1;
      }
      s = s->t.cons.cdr;
      ch = vf_sexp_skip(stream);
      if (ch < 0){
	fprintf(stderr, "VFlib: Broken vflibcap file - unexpected EOF\n");
	return -1;
      }
      if (ch == ')')
	break;
      SEXP_STREAM_UNGETC(stream, ch);
    }
    return 0;
  } else if (ch == ')'){            /* broken s-exp */
    fprintf(stderr, "VFlib: Broken vflibcap file - unexpected ')'\n");
    return -1;
  } else if (ch == '"'){            /* string */
    s->tag = VF_SEXP_TAG_STRING;
    return vf_sexp_read_str(stream, ch, s);
  } else {                          /* symbol */
    s->tag = VF_SEXP_TAG_SYMBOL;
    return vf_sexp_read_str(stream, ch, s);
  }

  fprintf(stderr, "VFlib Error [sexp.c:vf_sexp_read2()]: %s\n",
	  "Cannot Happen");
  abort();
  return -1;
}

static int
vf_sexp_read_str(SEXP_STREAM stream, char ch, SEXP s)
{
  char         tmp[8];
  int          ch1, dq_str; 
  int          bindex, i;
  unsigned int un; 
  static char  *buff = NULL;
  static int   nbuff = 0; 

  bindex = 0;
  s->t.str = NULL;

  /* alloc read buffer if not exist */
  if (buff == NULL){
    nbuff = NBUFFER_MIN;
    if ((buff = (char*)malloc(nbuff)) == NULL){
      nbuff = 0;
      return -1;
    }
  }

  /* enclosed by double quote? */
  dq_str = 0;
  if (ch == '"'){
    dq_str = 1;
    if ((ch = SEXP_STREAM_GETC(stream)) < 0){
      fprintf(stderr, "VFlib: Broken vflibcap file - unexpected EOF\n");
      return -1;
    }
    if (ch == '"')
      goto STR_END;
  }


  for (;;){

    /* realloc read buffer if strng is larger than buffer size */
    if (bindex >= nbuff-1){
      if ((nbuff = nbuff + NBUFFER_MIN) > NBUFFER_MAX){
	fprintf(stderr, "VFlib: vflibcap too large. Fogotten parentheses?\n");
	exit(1);
      }
      if ((buff = realloc(buff, nbuff)) == NULL)
	nbuff = 0;
    }

    if (ch == '\\'){   /* escape syntax */
      ch1 = SEXP_STREAM_GETC(stream);
      if (isdigit((int)ch1)){            /* '\123'    - octal (3 digits) */
	tmp[0] = SEXP_STREAM_GETC(stream); 
	tmp[1] = SEXP_STREAM_GETC(stream); 
	tmp[2] = SEXP_STREAM_GETC(stream); 
	tmp[3] = '\0';
	sscanf(tmp, "%o", &un);
	ch = un;
      } else if (ch1 == 'x'){            /* '\x12'    - hex (2 digits) */
	tmp[0] = SEXP_STREAM_GETC(stream); 
	tmp[1] = SEXP_STREAM_GETC(stream); 
	tmp[2] = '\0';
	sscanf(tmp, "%x", &un);
	ch = un;
      } else {                              /* '\n', '\t', '\:' etc. */
	switch (ch1){
	case 'a':   ch = '\a'; break;
	case 'b':   ch = '\b'; break;
	case 'f':   ch = '\f'; break;
	case 'n':   ch = '\n'; break;
	case 'r':   ch = '\r'; break;
	case 't':   ch = '\t'; break;
	case 'v':   ch = '\v'; break;
	default:    ch = ch1;  break;
	}
      }
    }

    /* put a char into read buffer */
    buff[bindex++] = ch;

    /* get next char */
    ch = SEXP_STREAM_GETC(stream);
    if ((dq_str == 0) && (ch < 0)){
      break;
    } else if ((dq_str == 1) && (ch < 0)){
      fprintf(stderr, "VFlib: Broken vflibcap file - unexpected EOF: \"");
      for (i = 0; i < bindex; i++){
	if ((buff[i] == '\0') || (buff[i] == '\n') || (buff[i] == '\f'))
	  break;
	fprintf(stderr, "%c", buff[i]);
      }
      fprintf(stderr, "...\n");
      return -1;
    }

    if ((dq_str == 1) && (ch == '"')){
      break;
    } else if (dq_str == 0){
      if (isspace((int)ch))
	break;
      if ((ch == '(') || (ch == ')') || (ch == ';')){
	SEXP_STREAM_UNGETC(stream, ch);
	break;
      }
    }

  }

STR_END:
  buff[bindex++] = '\0';

  /* copy into sexp */
  if ((s->t.str = malloc(bindex)) == NULL)
    return -1;
  memcpy(s->t.str, buff, bindex);

  if (nbuff > NBUFFER_MED){   /* read buffer became large. release it. */ 
    nbuff = NBUFFER_MED;
    if ((buff = realloc(buff, nbuff)) == NULL)
      nbuff = 0;
  }

  return 0;
}


static int
vf_sexp_skip(SEXP_STREAM stream)
{
  int  ch;

  for (;;){
    /* read a char from stream */
    if ((ch = SEXP_STREAM_GETC(stream)) < 0)
      return -1;  /* eof */
    /* skip white space */
    if (isspace((int)ch))
      continue;
    if (ch != ';')
      break;
    /* skip comment */
    if (ch == ';'){
      for (;;){  /* skip until the end of line */
	if ((ch = SEXP_STREAM_GETC(stream)) < 0)
	  return -1;
	if (ch == '\n')
	  break;
      }
      continue;
    }
  }

  return ch;
}


/*
 * Parse C String to String/List/AList
 */

SEXP
vf_sexp_cstring2string(char *str)
{
  SEXP  s;

  if ((s = vf_sexp_alloc(VF_SEXP_TAG_STRING)) == NULL)
    return NULL;
  if (str == NULL)
    str = "";
  if ((s->t.str = (char*)malloc(strlen(str)+1)) == NULL){
    vf_sexp_free(&s);
    return NULL;
  }
  strcpy(s->t.str, str);
  
  return s;
}

SEXP
vf_sexp_cstring2list(char *cstr)
     /*  C-str "xxx, yyy, zzz, ..."   ==>  SEXP ("xxx" "yyy" "zzz" ...) */
{
  SEXP  head, tail, last, cell, str, val;
  char  c, *start, *p, *q;
  int   len, i;

  head = vf_sexp_alloc(VF_SEXP_TAG_CONS);
  tail = vf_sexp_alloc(VF_SEXP_TAG_NIL);
  vf_sexp_rplacd(head, tail);

  if (cstr == NULL)
    goto End;

  p = cstr;
  last = head;
  for (;;){
    /* skip spaces */
    for (c = *p; 
	 (!isprint((int)c)||isspace((int)c)) && (c != '\0') ; 
	 p++, c = *p)
      ;
    if (c == '\0')
      break;

    /* an element starts */
    start = p;
    len = 0;

    /* go to end of an element */
    for (c = *p; 
	 (isprint((int)c)&&!isspace((int)c)) && (c != ',') && (c != '\0');
	 len++, p++, c = *p){
      (void) vf_get_char_esc(&p, NULL);
    }

    /* copy string */
    str = vf_sexp_alloc(VF_SEXP_TAG_STRING);
    str->t.str = (char*)malloc(len+1);
    for (i = 0, q = start; i < len; i++){
      str->t.str[i] = vf_get_char_esc(&q, NULL);
      q++;
    }
    str->t.str[len] = '\0';
    cell = vf_sexp_cons(str, last);
    vf_sexp_rplacd(last, cell);
    vf_sexp_rplacd(cell, tail);
    last = cell;

    if (c == '\0')
      break;

    /* skip spaces */
    for (c = *p;
	 (!isprint((int)c)||isspace((int)c)) && (c != ',') && (c != '\0');
	 p++, c = *p)
      ;
    if (c == '\0')
      break;

    if (c == ',')
      p++;
  }

 End:
  val = vf_sexp_cdr(head);
  head->t.cons.cdr = NULL;
  vf_sexp_free(&head);

  return val;
}

SEXP
vf_sexp_cstring2alist(char *cstr)
     /*  C-str "x1=y1, x2=y2, ..."   ==>  SEXP (("x1" "y1") ("x2" "y2") ...) */
{
  SEXP  head, tail, last, cell_list1, cell_list2, cell, nil;
  SEXP  str_key, str_val, val;
  char  c, *start_key, *start_val, *p, *q;
  int   len_key, len_val, i;

  head = vf_sexp_alloc(VF_SEXP_TAG_CONS);
  tail = vf_sexp_alloc(VF_SEXP_TAG_NIL);
  vf_sexp_rplacd(head, tail);

  if (cstr == NULL)
    goto End;

  p = cstr;
  last = head;
  for (;;){
    /* skip spaces */
    for (c = *p;
	 (!isprint((int)c)||isspace((int)c)) && (c != '\0');
	 p++, c = *p)
      ;
    if (c == '\0')
      break;

    /* an key starts */                  /* "^..." */
    start_key = p;
    len_key = 0;

    /* go to end of an key */
    for (c = *p; 
	 (isprint((int)c)&&!isspace((int)c))
	 && (c != '=') && (c != ',') && (c != '\0');
	 len_key++, p++, c = *p)
      ;

    /* skip spaces */
    for (c = *p;
	 (!isprint((int)c)||isspace((int)c)) && (c != '\0');
	 p++, c = *p)
      ;
    if ((c == ',') || (c == '\0')){     /* "KEY ^, ..." or "KEY  ^" */
      start_val = NULL;
      len_val = 0;
      goto Found;
    }
    if ((c != '=') && isprint((int)c)){ /* "KEY ^foo" */
      start_val = NULL;
      len_val = 0;
      goto Found;
    }
    
    p++;                                /* "KEY ^= ..." */

    /* skip spaces */                   /* "KEY =^ ..." */
    for (c = *p;
	 (!isprint((int)c)||isspace((int)c)) && (c != '\0');
	 p++, c = *p)
      ;
    if ((c == ',') || (c == '\0')){     /* "KEY = ^, ..." or "KEY =^" */
      start_val = NULL;
      len_val = 0;
      goto Found;
    }

    /* a value starts */                 /* "KEY = ^..." */
    start_val = p;
    len_val = 0;

    /* go to end of an value */
    for (c = *p; 
	 (isprint((int)c)&&!isspace((int)c))
	 && (c != ',') && (c != '\0'); 
	 len_val++, p++, c = *p)
      (void) vf_get_char_esc(&p, NULL);
                                         /* "KEY = VALUE^... " */
Found:
    /* copy string */
    str_key = vf_sexp_alloc(VF_SEXP_TAG_STRING);
    str_key->t.str = (char*)malloc(len_key+1);
    for (i = 0; i < len_key; i++)
      str_key->t.str[i] = start_key[i];
    str_key->t.str[len_key] = '\0';

    str_val = vf_sexp_alloc(VF_SEXP_TAG_STRING);
    str_val->t.str = (char*)malloc(len_val+1);
    for (i = 0, q = start_val; i < len_val; i++){
      str_val->t.str[i] = vf_get_char_esc(&q, NULL);
      q++;
    }
    str_val->t.str[len_val] = '\0';

    nil = vf_sexp_alloc(VF_SEXP_TAG_NIL);
    cell_list2 = vf_sexp_cons(str_val, nil);
    cell_list1 = vf_sexp_cons(str_key, cell_list2);
    cell = vf_sexp_cons(cell_list1, last);
    vf_sexp_rplacd(last, cell);
    vf_sexp_rplacd(cell, tail);
    last = cell;

    if (c == '\0')
      break;

    /* skip spaces */
    for (c = *p;
	 (!isprint((int)c)||isspace((int)c)) && (c != ',') && (c != '\0');
	 p++, c = *p)
      ;
    if (c == '\0')
      break;

    if (c == ',')
      p++;
  }

 End:
  val = vf_sexp_cdr(head);
  head->t.cons.cdr = NULL;
  vf_sexp_free(&head);

  return val;
}

static char 
vf_get_char_esc(char **pp, SEXP_STREAM stream)
{
  char   c, *p, tmp[8];
  unsigned int  un;

  p = NULL;
  if (pp != NULL)
    p = *pp;

  c = *p;
  if (c == '\\'){
    c = *(++p);
    if (isdigit((int)c)){
      tmp[0] = c;
      tmp[1] = *(++p); 
      tmp[2] = *(++p);
      tmp[3] = '\0';
      sscanf(tmp, "%o", &un);
      c = un;
    } else if (c == 'x'){
      tmp[0] = *(++p);
      tmp[1] = *(++p);
      tmp[2] = '\0';
      sscanf(tmp, "%x", &un);
      c = un;
    } else {
      switch (c){
      case 'a':   c = '\a'; break;
      case 'b':   c = '\b'; break;
      case 'f':   c = '\f'; break;
      case 'n':   c = '\n'; break;
      case 'r':   c = '\r'; break;
      case 't':   c = '\t'; break;
      case 'v':   c = '\v'; break;
      }
    }
  }

  if (pp != NULL)
    *pp = p;

  return c;
}



/* 
 * Alloc/Release an S-Expression Object 
 */

static SEXP
vf_sexp_alloc(int tag)
{
  SEXP  s;

  if ((s = calloc(1, sizeof(struct s_sexp))) != NULL)
    s->tag = tag;
  switch (tag){
  case VF_SEXP_TAG_NIL:
    break;
  case VF_SEXP_TAG_CONS:
    s->t.cons.car = NULL;
    s->t.cons.cdr = NULL;
    break;
  case VF_SEXP_TAG_STRING:
  case VF_SEXP_TAG_SYMBOL:
    s->t.str = NULL;
  }
  return s;
}

void
vf_sexp_free4(SEXP *s1, SEXP *s2, SEXP *s3, SEXP *s4)
{
  vf_sexp_free(s1);  vf_sexp_free(s2);
  vf_sexp_free(s3);  vf_sexp_free(s4);
}

void
vf_sexp_free3(SEXP *s1, SEXP *s2, SEXP *s3)
{
  vf_sexp_free(s1); vf_sexp_free(s2); vf_sexp_free(s3);
}

void
vf_sexp_free2(SEXP *s1, SEXP *s2)
{
  vf_sexp_free(s1); vf_sexp_free(s2);
}

void
vf_sexp_free1(SEXP *s1)
{
  vf_sexp_free(s1);
}

void
vf_sexp_free(SEXP *var_ptr)
{
  SEXP   s, scar, scdr;

  if (var_ptr == NULL)
    return;
  if ((s = *var_ptr) == NULL)
    return;
  *var_ptr = NULL;

  vf_sexp_obj_validate(s);

  while (s != NULL){
    switch (s->tag){
    case VF_SEXP_TAG_CONS:
      scar = s->t.cons.car;
      scdr = s->t.cons.cdr;
      vf_sexp_free(&scar);
      s->tag = VF_SEXP_TAG_RELEASED;
      vf_free(s);
      s = scdr;
      break;

    case VF_SEXP_TAG_STRING:
    case VF_SEXP_TAG_SYMBOL:
      if (s->t.str != NULL)
	vf_free(s->t.str);
      /*FALLTHROUGHT*/
    case VF_SEXP_TAG_NIL:
      s->tag = VF_SEXP_TAG_RELEASED;
      vf_free(s);
      return;

    case VF_SEXP_TAG_RELEASED:
      fprintf(stderr, "VFlib internal error: releasing released s-sexp obj\n");
      abort();
    default:
      fprintf(stderr, "VFlib internal error: cannot happen vf_sexp_free()\n");
      abort();
    }
  }
}


static void
vf_sexp_obj_validate2(SEXP s1, SEXP s2)
{
  vf_sexp_obj_validate(s1);
  vf_sexp_obj_validate(s2);
}

static void
vf_sexp_obj_validate(SEXP s)
{
  if ((s == NULL) || (s->tag == VF_SEXP_TAG_RELEASED)){
    fprintf(stderr, "VFlib internal error: Invalid s-exp object\n");
    abort();
  }
}


#ifdef DEBUG

/*
 * example 1 (file stream) :     echo '( abcfdf 123 (3 4 5 ) )' | ./dbg-sexp 
 * example 2 (string stream) :  ./dbg-sexp '( abcfdf 123 (3 4 5 ) )'
 */

int
main(int argc, char **argv)
{
  char   *str;
  SEXP   s;

  if (argc > 1){
    str = argv[1];
    s = vf_sexp_read_from_string_stream(str);
  } else {
    s = vf_sexp_read_from_file_stream(stdin);    
  }
  vf_sexp_pp(s);

  return 0;
}

#endif

/*EOF*/