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gp.c

/* $Id: gp.c,v 1.61.2.7 2003/01/11 15:49:46 karim Exp $

Copyright (C) 2000  The PARI group.

This file is part of the PARI/GP package.

PARI/GP is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation. It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY WHATSOEVER.

Check the License for details. You should have received a copy of it, along
with the package; see the file 'COPYING'. If not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

/*******************************************************************/
/**                                                               **/
/**                        PARI CALCULATOR                        **/
/**                                                               **/
/*******************************************************************/
#include "pari.h"
#ifdef _WIN32
#  include <windows.h>
#  ifndef WINCE
#    include <process.h>
#  endif
#endif
#ifdef HAS_STRFTIME
#  include <time.h>
#endif
#include "../language/anal.h"
#include "gp.h"

#ifdef READLINE
  extern void init_readline();
BEGINEXTERN
#  if defined(__cplusplus) && defined(__SUNPRO_CC)
  /* readline.h gives a bad definition of readline() */
  extern char*readline(char*);
#  else
#   ifdef READLINE_LIBRARY
#     include <readline.h>
#   else
#     include <readline/readline.h>
#   endif
#  endif
  extern int isatty(int);
  extern void add_history(char*);
ENDEXTERN
#endif

char*  _analyseur(void);
void   _set_analyseur(char *s);
void   err_recover(long numerr);
void   free_graph(void);
void   gp_expand_path(char *v);
int    gp_init_entrees(module *modlist, entree **hash, int force);
long   gptimer(void);
void   init80(long n);
void   init_defaults(int force);
void   initout(int initerr);
void   init_graph(void);
void   init_lim_lines(char *s, long max);
extern void   install0(char *name, char *code, char *gpname, char *lib);
void   pari_sig_init(void (*f)(int));
int    whatnow(char *s, int flag);

#if 0 /* to debug TeXmacs interface */
#define DATA_BEGIN  ((char) 'B')
#define DATA_END    ((char) 'E')
#else
#define DATA_BEGIN  ((char) 2)
#define DATA_END    ((char) 5)
#endif
#define DATA_ESCAPE ((char) 27)

#define MAX_PROMPT_LEN 128
#define DFT_PROMPT "? "
#define COMMENTPROMPT "comment> "
#define DFT_INPROMPT ""
static GEN *hist;
static char *help_prg,*path;
static char prompt[MAX_PROMPT_LEN];
static char thestring[256];
static char *prettyprinter;
static char *prettyprinter_dft = "tex2mail -TeX -noindent -ragged -by_par";
static pariFILE *prettyprinter_file;
static long prettyp, test_mode, quiet_mode, gpsilent, simplifyflag;
static long chrono, pariecho, primelimit, parisize, strictmatch;
static long tglobal, histsize, paribufsize, lim_lines;
static int tm_is_waiting = 0, handle_C_C = 0;
static gp_format fmt;

typedef struct Buffer {
  char *buf;
  long len;
  jmp_buf env;
  int flenv;
} Buffer;

#define current_buffer (bufstack?((Buffer*)(bufstack->value)):NULL)
static stack *bufstack = NULL;

#define LBRACE '{'
#define RBRACE '}'
#define pariputs_opt(s) if (!quiet_mode) pariputs(s)

static void
usage(char *s)
{
  printf("### Usage: %s [options]\n", s);
  printf("Options are:\n");
  printf("\t[-b buffersize]\tDeprecated\n");
  printf("\t[-emacs]\tRun as if in Emacs shell\n");
  printf("\t[-f]\t\tFaststart: do not read .gprc\n");
  printf("\t[--help]\tPrint this message\n");
  printf("\t[-q]\t\tQuiet mode: do not print banner and history numbers\n");
  printf("\t[-p primelimit]\tPrecalculate primes up to the limit\n");
  printf("\t[-s stacksize]\tStart with the PARI stack of given size (in bytes)\n");
  printf("\t[-test]\t\tTest mode.  As -q, plus wrap long lines\n");
  printf("\t[--version]\tOutput version info and exit\n\n");
  exit(0);
}

/* must be called BEFORE pari_init() */
static void
gp_preinit(int force)
{
  static char *dflt;
  char *help;
  long i;

  if (force)
  {
#if !defined(macintosh) || defined(__MWERKS__)
    primelimit = 500000; parisize = 1000000*sizeof(long);
    dflt = DFT_PROMPT;
#else
    primelimit = 200000; parisize = 1000000;
    dflt = "?\n";
#endif
  }
  strcpy(prompt, dflt);

#if defined(UNIX) || defined(__EMX__)
#  if defined(__EMX__) || defined(__CYGWIN32__)
  path = pari_strdup(".;C:/;C:/gp");
#  else
  path = pari_strdup(".:~:~/gp");
#  endif
  help = getenv("GPHELP");
# ifdef GPHELP
    if (!help) help = GPHELP;
# endif
#else
  path = pari_strdup(".");
  help = NULL;
#endif
  help_prg = help? pari_strdup(help): NULL;
  prettyp = f_PRETTYMAT;
  strictmatch = simplifyflag = 1;
  tglobal = 0;
  bufstack = NULL;
  secure = test_mode = under_emacs = under_texmacs = chrono = pariecho = 0;
  prettyprinter = prettyprinter_dft;
  prettyprinter_file = NULL;
  fmt.format = 'g'; fmt.field = 0;
#ifdef LONG_IS_64BIT
  fmt.nb = 38;
#else
  fmt.nb = 28;
#endif
  lim_lines = 0;
  histsize = 5000; paribufsize = 1024;
  i = histsize*sizeof(GEN);
  hist = (GEN *) gpmalloc(i); memset(hist,0,i);
  for (i=0; i<c_LAST; i++) gp_colors[i] = c_NONE;
}

#define GET_SEP_SIZE 128
#define separe(c)  ((c)==';' || (c)==':')

/* Return all chars, up to next separator */
static char*
get_sep(char *t)
{
  static char buf[GET_SEP_SIZE], *lim = buf + GET_SEP_SIZE-1;
  char *s = buf;
  int outer=1;

  for(;;)
  {
    switch(*s++ = *t++)
    {
      case '"':
        if (outer || s[-2] != '\\') outer = !outer;
        break;
      case '\0':
        return buf;
      default:
        if (outer && separe(*t)) { *s=0; return buf; }
    }
    if (s == lim) err(talker,"buffer overflow in get_sep");
  }
}

/* as above, t must be writeable, return 1 if we modified t */
static int
get_sep2(char *t)
{
  int outer=1;
  char *s = t;

  for(;;)
  {
    switch (*s++)
    {
      case '"':
        if (outer || s[-2] != '\\') outer = !outer;
        break;
      case '\0':
        return 0;
      default:
        if (outer && separe(*s)) { *s=0; return 1; }
    }
  }
}

static long
get_int(char *s, long dflt)
{
  char *p=get_sep(s);
  long n=atol(p);

  if (*p == '-') p++;
  while(isdigit((int)*p)) { p++; dflt=n; }
  switch(*p)
  {
    case 'k': case 'K': dflt *= 1000;    p++; break;
    case 'm': case 'M': dflt *= 1000000; p++; break;
  }
  if (*p) err(talker2,"I was expecting an integer here", s, s);
  return dflt;
}

/* tell TeXmacs GP will start outputing data */
static void
tm_start_output()
{
  if (!tm_is_waiting) { printf("%cverbatim:",DATA_BEGIN); fflush(stdout); }
  tm_is_waiting = 1;
}

/* tell TeXmacs GP is done and is waiting for new data */
static void
tm_end_output()
{
  if (tm_is_waiting) { printf("%c", DATA_END); fflush(stdout); } 
  tm_is_waiting = 0;
}

static void
gp_output(GEN x)
{
  long tx=typ(x);

  if (fmt.nb >= 0 && is_intreal_t(tx))
    ecrire(x, fmt.format, fmt.nb, fmt.field);
  else
    switch(prettyp)
    {
      case f_PRETTYMAT: matbrute(x, fmt.format, fmt.nb); break;
      case f_PRETTY:
      case f_PRETTYOLD: sor(x, fmt.format, fmt.nb, fmt.field); break;
      case f_RAW      : brute(x, fmt.format, fmt.nb); break;
      case f_TEX      : texe(x, fmt.format, fmt.nb); break;
    }
}

/* print a sequence of (NULL terminated) GEN */
void
print0(GEN *g, long flag)
{
  int old=prettyp;

  if (flag < NBFORMATS) added_newline=1;
  else
    { flag -= NBFORMATS; added_newline=0; }
  prettyp=flag;

  for( ; *g; g++)
    if (typ(*g)==t_STR)
      pariputs(GSTR(*g)); /* otherwise it's surrounded by "" */
    else
      gp_output(*g);

  if (added_newline) pariputc('\n');
  prettyp=old; pariflush();
}

/* write a sequence of (NULL terminated) GEN, to file s */
void
write0(char *s, GEN *g, long flag)
{
  int i = added_newline;
  s = expand_tilde(s);
  if (secure)
  {
    fprintferr("[secure mode]: about to write to '%s'. OK ? (^C if not)\n",s);
    hit_return();
  }
  switchout(s); free(s);
  print0(g,flag); added_newline = i;
  switchout(NULL);
}

Buffer *
new_buffer()
{
  Buffer *b = (Buffer*) gpmalloc(sizeof(Buffer));
  b->len = paribufsize;
  b->buf = gpmalloc(b->len);
  b->flenv = 0; return b;
}

void
del_buffer(Buffer *b)
{
  if (!b) return;
  free(b->buf); free((void*)b);
}

static void
pop_buffer()
{
  Buffer *b = (Buffer*) pop_stack(&bufstack);
  del_buffer(b);
}

/* kill all buffers until B is met or nothing is left */
static void
kill_all_buffers(Buffer *B)
{
  for(;;) {
    Buffer *b = current_buffer;
    if (b == B || !b) break;
    pop_buffer();
  }
}

static void
jump_to_buffer()
{
  Buffer *b;
  while ( (b = current_buffer) )
  {
    if (b->flenv) break;
    pop_buffer();
  }
  if (!b) longjmp(environnement, 0);
  longjmp(b->env, 0);
}

static void
jump_to_given_buffer(Buffer *buf)
{
  Buffer *b;
  while ( (b = current_buffer) )
  {
    if (b == buf) break;
    pop_buffer();
  }
  if (!b->env) { b = NULL; err(warner,"no environmnent tied to buffer"); }
  if (!b) longjmp(environnement, 0);
  longjmp(b->env, 0);
}

/********************************************************************/
/*                                                                  */
/*                            DEFAULTS                              */
/*                                                                  */
/********************************************************************/
static void
do_strftime(char *s, char *buf)
{
#ifdef HAS_STRFTIME
  time_t t = time(NULL);
  strftime(buf,MAX_PROMPT_LEN-1,s,localtime(&t));
#else
  strcpy(buf,s);
#endif
}

static GEN
sd_numeric(char *v, int flag, char *s, long *ptn, long Min, long Max,
           char **msg)
{
  long n;
  if (*v == 0) n = *ptn;
  else
  {
    n = get_int(v,0);
    if (*ptn == n) return gnil;
    if (n > Max || n < Min)
    {
      sprintf(thestring, "default: incorrect value for %s [%ld-%ld]",
            s, Min, Max);
      err(talker2, thestring, v,v);
    }
    *ptn = n;
  }
  switch(flag)
  {
    case d_RETURN: return stoi(n);
    case d_ACKNOWLEDGE:
      if (msg)
      {
      if (!*msg)
        msg++; /* single msg, always printed */
      else
        msg += n; /* one per possible value */
      pariputsf("   %s = %ld %s\n", s, n, *msg);
      }
      else if (Max != 1 || Min != 0)
      pariputsf("   %s = %ld\n", s, n);
      else /* toggle */
      {
      if (n==1) pariputsf("   %s = 1 (on)\n", s);
      else      pariputsf("   %s = 0 (off)\n", s);
      } /* fall through */
    default: return gnil;
  }
}

#define PRECDIGIT (long)((prec-2.)*pariK)
static GEN
sd_realprecision(char *v, int flag)
{
  if (*v)
  {
    long newnb = get_int(v, fmt.nb);
    long newprec = (long) (newnb*pariK1 + 3);

    if (fmt.nb == newnb && prec == newprec) return gnil;
    if (newnb < 0) err(talker,"default: negative real precision");
    fmt.nb = newnb; prec = newprec;
  }
  if (flag == d_RETURN) return stoi(fmt.nb);
  if (flag == d_ACKNOWLEDGE)
  {
    long n = PRECDIGIT;
    pariputsf("   realprecision = %ld significant digits", n);
    if (n != fmt.nb) pariputsf(" (%ld digits displayed)", fmt.nb);
    pariputc('\n');
  }
  return gnil;
}
#undef PRECDIGIT

static GEN
sd_seriesprecision(char *v, int flag)
{
  char *msg[] = {NULL, "significant terms"};
  return sd_numeric(v,flag,"seriesprecision",&precdl, 0,LGBITS,msg);
}

static GEN
sd_format(char *v, int flag)
{
  if (*v)
  {
    char c = *v;
    if (c!='e' && c!='f' && c!='g')
      err(talker2,"default: inexistent format",v,v);
    fmt.format = c; v++;

    if (isdigit((int)*v))
      { fmt.field=atol(v); while (isdigit((int)*v)) v++; }
    if (*v++ == '.')
    {
      if (*v == '-') fmt.nb = -1;
      else
      if (isdigit((int)*v)) fmt.nb=atol(v);
    }
  }
  if (flag == d_RETURN)
  {
    sprintf(thestring, "%c%ld.%ld", fmt.format, fmt.field, fmt.nb);
    return strtoGENstr(thestring,0);
  }
  if (flag == d_ACKNOWLEDGE)
    pariputsf("   format = %c%ld.%ld\n", fmt.format, fmt.field, fmt.nb);
  return gnil;
}

static long
gp_get_color(char **st)
{
  char *s, *v = *st;
  int c, trans;
  if (isdigit((int)*v))
    { c = atol(v); trans = 1; } /* color on transparent background */
  else
  {
    if (*v == '[')
    {
      char *a[3];
      int i = 0;
      for (a[0] = s = ++v; *s && *s != ']'; s++)
        if (*s == ',') { *s = 0; a[++i] = s+1; }
      if (*s != ']') err(talker2,"expected character: ']'",s, *st);
      *s = 0; for (i++; i<3; i++) a[i] = "";
      /*    properties    |   color    | background */
      c = (atoi(a[2])<<8) | atoi(a[0]) | (atoi(a[1])<<4);
      trans = (*(a[1]) == 0);
      v = s + 1;
    } 
    else { c = c_NONE; trans = 0; }
  }
  if (trans) c = c | (1<<12);
  while (*v && *v++ != ',') /* empty */;
  if (c != c_NONE) disable_color=0;
  *st = v; return c;
}

static GEN
sd_colors(char *v, int flag)
{
  long c,l;
  if (*v && !under_emacs && !under_texmacs)
  {
    char *tmp;
    disable_color=1;
    l = strlen(v);
    if (l <= 2 && strncmp(v, "no", l) == 0)
      v = "";
    if (l <= 6 && strncmp(v, "darkbg", l) == 0)
      v = "1, 5, 3, 7, 6, 2, 3";    /* Assume recent ReadLine. */
    if (l <= 7 && strncmp(v, "lightbg", l) == 0)
      v = "1, 6, 3, 4, 5, 2, 3";    /* Assume recent ReadLine. */
    tmp = v = pari_strdup(v); filtre(v, f_INIT|f_REG);
    for (c=c_ERR; c < c_LAST; c++)
      gp_colors[c] = gp_get_color(&v);
    free(tmp);
  }
  if (flag == d_ACKNOWLEDGE || flag == d_RETURN)
  {
    char *s = thestring;
    int col[3], n;
    for (*s=0,c=c_ERR; c < c_LAST; c++)
    {
      n = gp_colors[c];
      if (n == c_NONE) 
        sprintf(s,"no");
      else
      {
        decode_color(n,col);
        if (n & (1<<12))
        {
          if (col[0])
            sprintf(s,"[%d,,%d]",col[1],col[0]);
          else
            sprintf(s,"%d",col[1]);
        }
        else
          sprintf(s,"[%d,%d,%d]",col[1],col[2],col[0]);
      }
      s += strlen(s);
      if (c < c_LAST - 1) { *s++=','; *s++=' '; }
    }
    if (flag==d_RETURN) return strtoGENstr(thestring,0);
    pariputsf("   colors = \"%s\"\n",thestring);
  }
  return gnil;
}

static GEN
sd_compatible(char *v, int flag)
{
  char *msg[] = {
    "(no backward compatibility)",
    "(warn when using obsolete functions)",
    "(use old functions, don't ignore case)",
    "(use old functions, ignore case)", NULL
  };
  long old = compatible;
  GEN r = sd_numeric(v,flag,"compatible",&compatible, 0,3,msg);

  if (old != compatible && flag != d_INITRC)
  {
    int res = gp_init_entrees(new_fun_set? pari_modules: pari_oldmodules,
                          functions_hash, 0);
    if (res) err(warner,"user functions re-initialized");
  }
  return r;
}

static GEN
sd_secure(char *v, int flag)
{
  if (*v && secure)
  {
    fprintferr("[secure mode]: Do you want to modify the 'secure' flag? (^C if not)\n");
    hit_return();
  }
  return sd_numeric(v,flag,"secure",&secure, 0,1,NULL);
}

static GEN
sd_buffersize(char *v, int flag)
{ return sd_numeric(v,flag,"buffersize",&paribufsize, 1,
                    (VERYBIGINT / sizeof(long)) - 1,NULL); }
static GEN
sd_debug(char *v, int flag)
{ return sd_numeric(v,flag,"debug",&DEBUGLEVEL, 0,20,NULL); }

static GEN
sd_debugfiles(char *v, int flag)
{ return sd_numeric(v,flag,"debugfiles",&DEBUGFILES, 0,20,NULL); }

static GEN
sd_debugmem(char *v, int flag)
{ return sd_numeric(v,flag,"debugmem",&DEBUGMEM, 0,20,NULL); }

static GEN
sd_echo(char *v, int flag)
{ return sd_numeric(v,flag,"echo",&pariecho, 0,1,NULL); }

static GEN
sd_lines(char *v, int flag)
{ return sd_numeric(v,flag,"lines",&lim_lines, 0,VERYBIGINT,NULL); }

static GEN
sd_histsize(char *v, int flag)
{
  long n = histsize;
  GEN r = sd_numeric(v,flag,"histsize",&n, 1,
                     (VERYBIGINT / sizeof(long)) - 1,NULL);
  if (n != histsize)
  {
    long i = n*sizeof(GEN);
    GEN *gg = (GEN *) gpmalloc(i); memset(gg,0,i);

    if (tglobal)
    {
      long k = (tglobal-1) % n;
      long kmin = k - min(n,histsize), j = k;

      i = (tglobal-1) % histsize;
      while (k > kmin)
      {
      gg[j] = hist[i];
      hist[i] = NULL;
      if (!i) i = histsize;
      if (!j) j = n;
      i--; j--; k--;
      }
      while (hist[i])
      {
      gunclone(hist[i]);
      if (!i) i = histsize;
      i--;
      }
    }
    free((void*)hist); hist=gg; histsize=n;
  }
  return r;
}

static GEN
sd_log(char *v, int flag)
{
  long vlog = logfile? 1: 0, old = vlog;
  GEN r = sd_numeric(v,flag,"log",&vlog, 0,1,NULL);
  if (vlog != old)
  {
    if (vlog)
    {
      logfile = fopen(current_logfile, "a");
      if (!logfile) err(openfiler,"logfile",current_logfile);
#ifndef WINCE
      setbuf(logfile,(char *)NULL);
#endif
    }
    else
    {
      if (flag == d_ACKNOWLEDGE)
        pariputsf("   [logfile was \"%s\"]\n", current_logfile);
      fclose(logfile); logfile=NULL;
    }
  }
  return r;
}

static GEN
sd_output(char *v, int flag)
{
  char *msg[] = {"(raw)", "(prettymatrix)", "(prettyprint)", "(external prettyprint)", NULL};
  return sd_numeric(v,flag,"output",&prettyp, 0,3,msg);
}

extern void err_clean();

void
allocatemem0(unsigned long newsize)
{
  parisize = allocatemoremem(newsize);
  err_clean();
  jump_to_buffer();
}

static GEN
sd_parisize(char *v, int flag)
{
  long n = parisize;
  GEN r = sd_numeric(v,flag,"parisize",&n, 10000,VERYBIGINT,NULL);
  if (n != parisize)
  {
    if (flag != d_INITRC) allocatemem0(n);
    parisize = n;
  }
  return r;
}

static GEN
sd_primelimit(char *v, int flag)
{
  long n = primelimit;
  GEN r = sd_numeric(v,flag,"primelimit",&n, 0,VERYBIGINT,NULL);
  if (n != primelimit)
  {
    if (flag != d_INITRC)
    {
      byteptr ptr = initprimes(n);
      free(diffptr); diffptr = ptr;
    }
    primelimit = n;
  }
  return r;
}

static GEN
sd_simplify(char *v, int flag)
{ return sd_numeric(v,flag,"simplify",&simplifyflag, 0,1,NULL); }

static GEN
sd_strictmatch(char *v, int flag)
{ return sd_numeric(v,flag,"strictmatch",&strictmatch, 0,1,NULL); }

static GEN
sd_timer(char *v, int flag)
{ return sd_numeric(v,flag,"timer",&chrono, 0,1,NULL); }

static GEN
sd_filename(char *v, int flag, char *s, char **f)
{
  if (*v)
  {
    char *old = *f;
    v = expand_tilde(v);
    do_strftime(v,thestring); free(v);
    *f = pari_strdup(thestring); free(old);
  }
  if (flag == d_RETURN) return strtoGENstr(*f,0);
  if (flag == d_ACKNOWLEDGE) pariputsf("   %s = \"%s\"\n",s,*f);
  return gnil;
}

static GEN
sd_logfile(char *v, int flag)
{
  GEN r = sd_filename(v, flag, "logfile", &current_logfile);
  if (*v && logfile)
  {
    fclose(logfile);
    logfile = fopen(current_logfile, "a");
    if (!logfile) err(openfiler,"logfile",current_logfile);
#ifndef WINCE
    setbuf(logfile,(char *)NULL);
#endif
  }
  return r;
}

static GEN
sd_psfile(char *v, int flag)
{ return sd_filename(v, flag, "psfile", &current_psfile); }

static void
err_secure(char *d, char *v)
{ err(talker,"[secure mode]: can't modify '%s' default (to %s)",d,v); }

static GEN
sd_help(char *v, int flag)
{
  char *str;
  if (*v)
  {
    if (secure) err_secure("help",v);
    if (help_prg) free(help_prg);
    help_prg = expand_tilde(v);
  }
  str = help_prg? help_prg: "none";
  if (flag == d_RETURN) return strtoGENstr(str,0);
  if (flag == d_ACKNOWLEDGE)
    pariputsf("   help = \"%s\"\n", str);
  return gnil;
}

static GEN
sd_path(char *v, int flag)
{
  if (*v)
  {
    char *old = path;
    path = pari_strdup(v); free(old);
    if (flag == d_INITRC) return gnil;
    gp_expand_path(path);
  }
  if (flag == d_RETURN) return strtoGENstr(path,0);
  if (flag == d_ACKNOWLEDGE)
    pariputsf("   path = \"%s\"\n",path);
  return gnil;
}

static GEN
sd_prettyprinter(char *v, int flag)
{
  if (*v && !under_texmacs)
  {
    char *old = prettyprinter;
    int cancel = (!strcmp(v,"no"));

    if (secure) err_secure("prettyprinter",v);
    if (!strcmp(v,"yes")) v = prettyprinter_dft;
    if (old && strcmp(old,v) && prettyprinter_file)
    {
      pariFILE *f;
      if (cancel) f = NULL;
      else
      {
        f = try_pipe(v, mf_OUT | mf_TEST);
        if (!f)
        {
          err(warner,"broken prettyprinter: '%s'",v);
          return gnil;
        }
      }
      pari_fclose(prettyprinter_file);
      prettyprinter_file = f;
    }
    prettyprinter = cancel? NULL: pari_strdup(v);
    if (old && old != prettyprinter_dft) free(old);
    if (flag == d_INITRC) return gnil;
  }
  if (flag == d_RETURN) return strtoGEN(prettyprinter? prettyprinter: "");
  if (flag == d_ACKNOWLEDGE)
    pariputsf("   prettyprinter = \"%s\"\n",prettyprinter? prettyprinter: "");
  return gnil;
}

static GEN
sd_prompt(char *v, int flag)
{
  if (*v)
  {
    strncpy(prompt,v,MAX_PROMPT_LEN);
#ifdef macintosh
    strcat(prompt,"\n");
#endif
  }
  if (flag == d_RETURN) return strtoGENstr(prompt,0);
  if (flag == d_ACKNOWLEDGE)
    pariputsf("   prompt = \"%s\"\n",prompt);
  return gnil;
}

default_type gp_default_list[] =
{
  {"buffersize",(void*)sd_buffersize},
  {"colors",(void*)sd_colors},
  {"compatible",(void*)sd_compatible},
  {"debug",(void*)sd_debug},
  {"debugfiles",(void*)sd_debugfiles},
  {"debugmem",(void*)sd_debugmem},
  {"echo",(void*)sd_echo},
  {"format",(void*)sd_format},
  {"help",(void*)sd_help},
  {"histsize",(void*)sd_histsize},
  {"lines",(void*)sd_lines},
  {"log",(void*)sd_log},
  {"logfile",(void*)sd_logfile},
  {"output",(void*)sd_output},
  {"parisize",(void*)sd_parisize},
  {"path",(void*)sd_path},
  {"primelimit",(void*)sd_primelimit},
  {"prettyprinter",(void*)sd_prettyprinter},
  {"prompt",(void*)sd_prompt},
  {"psfile",(void*)sd_psfile},
  {"realprecision",(void*)sd_realprecision},
  {"secure",(void*)sd_secure},
  {"seriesprecision",(void*)sd_seriesprecision},
  {"simplify",(void*)sd_simplify},
  {"strictmatch",(void*)sd_strictmatch},
  {"timer",(void *)sd_timer},
  {NULL,NULL} /* sentinel */
};

static void
help_default()
{
  default_type *dft;

  for (dft=gp_default_list; dft->fun; dft++)
    ((void (*)(ANYARG)) dft->fun)("", d_ACKNOWLEDGE);
}

static GEN
setdefault(char *s,char *v, int flag)
{
  default_type *dft;

  if (!*s) { help_default(); return gnil; }
  for (dft=gp_default_list; dft->fun; dft++)
    if (!strcmp(s,dft->name))
    {
      if (flag == d_EXISTS) return gun;
      return ((GEN (*)(ANYARG)) dft->fun)(v,flag);
    }
  if (flag == d_EXISTS) return gzero;
  err(talker,"unknown default: %s",s);
  return NULL; /* not reached */
}

/********************************************************************/
/**                                                                **/
/**                             HELP                               **/
/**                                                                **/
/********************************************************************/
static int
has_ext_help()
{
  if (help_prg)
  {
    char *buf = pari_strdup(help_prg), *s = buf;
    FILE *file;

    while (*s && *s != ' ') s++;
    *s = 0; file = fopen(buf,"r");
    if (file) { fclose(file); return 1; }
    free(buf);
  }
  return 0;
}
 
static int
compare_str(char **s1, char **s2) { return strcmp(*s1, *s2); }

/* Print all elements of list in columns, pausing every nbli lines
 * if nbli is non-zero.
 * list is a NULL terminated list of function names
 */
void
print_fun_list(char **list, int nbli)
{
  long i=0, j=0, maxlen=0, nbcol,len, w = term_width();
  char **l;

  while (list[i]) i++;
  qsort (list, i, sizeof(char *), (QSCOMP)compare_str);

  for (l=list; *l; l++)
  {
    len = strlen(*l);
    if (len > maxlen) maxlen=len;
  }
  maxlen++; nbcol= w / maxlen;
  if (nbcol * maxlen == w) nbcol--;
  if (!nbcol) nbcol = 1;

  pariputc('\n'); i=0;
  for (l=list; *l; l++)
  {
    pariputs(*l); i++;
    if (i >= nbcol)
    {
      i=0; pariputc('\n');
      if (nbli && j++ > nbli) { j = 0; hit_return(); }
      continue;
    }
    len = maxlen - strlen(*l);
    while (len--) pariputc(' ');
  }
  if (i) pariputc('\n');
}

#define LIST_LEN 1023
static void
commands(int n)
{
  int hashpos, s = 0, olds = LIST_LEN;
  entree *ep;
  char **list = (char **) gpmalloc((olds+1)*sizeof(char *));

  for (hashpos = 0; hashpos < functions_tblsz; hashpos++)
    for (ep = functions_hash[hashpos]; ep; ep = ep->next)
      if ((n<0 && ep->menu) || ep->menu == n)
      {
        list[s++] = ep->name;
        if (s >= olds)
        {
        int news = olds + (LIST_LEN + 1)*sizeof(char *);
          list = (char**) gprealloc(list,news,olds);
        olds = news;
        }
      }
  list[s]=NULL; print_fun_list(list,term_height()-4); free(list);
}

static void
print_user_fun(entree *ep)
{
  gp_args *f= (gp_args*)ep->args;
  GEN q = (GEN)ep->value, *arg = f->arg;
  int i, narg;


  q++; /* skip initial NULL */
  pariputs(ep->name); pariputc('(');
  narg = f->narg;
  for (i=1; i<=narg; i++, arg++)
  {
    entree *ep = varentries[*q++];
    pariputs(ep? ep->name:"#");
    if (!gcmp0(*arg)) { pariputc('='); bruteall(*arg,'g',-1,1); }
    if (i == narg) { arg++; break; }
    pariputs(", ");
  }
  pariputs(") = ");
  narg = f->nloc;
  if (narg)
  {
    pariputs("local(");
    for (i=1; i<=narg; i++, arg++)
    {
      entree *ep = varentries[*q++];
      pariputs(ep? ep->name:"#");
      if (!gcmp0(*arg)) { pariputc('='); bruteall(*arg,'g',-1,1); }
      if (i == narg) break;
      pariputs(", ");
    }
    pariputs("); ");
  }
  pariputs((char*)q);
}

static void
print_user_member(entree *ep)
{
  GEN q = (GEN)ep->value;
  entree *ep2;

  q++; /* skip initial NULL */
  ep2 = varentries[*q++];
  pariputs(ep2? ep2->name:"#");
  pariputsf(".%s = ", ep->name);
  pariputs((char*)q);
}

static void
user_fun()
{
  entree *ep;
  int hash;

  for (hash = 0; hash < functions_tblsz; hash++)
    for (ep = functions_hash[hash]; ep; ep = ep->next)
      if (EpVALENCE(ep) == EpUSER)
      {
      pariputc(LBRACE); print_user_fun(ep);
      pariputc(RBRACE); pariputs("\n\n");
      }
}

static void
user_member()
{
  entree *ep;
  int hash;

  for (hash = 0; hash < functions_tblsz; hash++)
    for (ep = members_hash[hash]; ep; ep = ep->next)
      if (EpVALENCE(ep) == EpMEMBER)
      {
      pariputc(LBRACE); print_user_member(ep);
      pariputc(RBRACE); pariputs("\n\n");
      }
}

static void
center(char *s)
{
  long i, pad = term_width() - strlen(s);
  char *u = thestring;

  if (pad<0) pad=0; else pad >>= 1;
  for (i=0; i<pad; i++) *u++ = ' ';
  while (*s) *u++ = *s++;
  *u++='\n'; *u=0; pariputs(thestring);
}

static void
community()
{
  long len = strlen(GPMISCDIR) + 1024;
  char *s = gpmalloc(len);
  
  sprintf(s, "The standard distribution of GP/PARI includes a reference \
manual, a tutorial, a reference card and quite a few examples. They should \
have been installed in the directory '%s'. If not you should ask the person \
who installed PARI on your system where they can be found. You can also \
download them from the PARI WWW site 'http://www.parigp-home.de/'",
GPMISCDIR);
  print_text(s); free(s);

  pariputs("\nThree mailing lists are devoted to PARI:\n\
  - pari-announce (moderated) to announce major version changes.\n\
  - pari-dev for everything related to the development of PARI, including\n\
    suggestions, technical questions, bug reports and patch submissions.\n\
  - pari-users for everything else!\n");
  print_text("\
To subscribe, send an empty message to <listname>-subscribe@list.cr.yp.to. You \
can only send messages to the lists you have subscribed to! An archive is kept \
at the WWW site mentioned above. You can also reach the authors directly by \
email: pari@math.u-bordeaux.fr (answer not guaranteed)."); }

static void
gentypes(void)
{
  pariputs("List of the PARI types:\n\
  t_INT    : long integers     [ cod1 ] [ cod2 ] [ man_1 ] ... [ man_k ]\n\
  t_REAL   : long real numbers [ cod1 ] [ cod2 ] [ man_1 ] ... [ man_k ]\n\
  t_INTMOD : integermods       [ code ] [ mod  ] [ integer ]\n\
  t_FRAC   : irred. rationals  [ code ] [ num. ] [ den. ]\n\
  t_FRACN  : rational numbers  [ code ] [ num. ] [ den. ]\n\
  t_COMPLEX: complex numbers   [ code ] [ real ] [ imag ]\n\
  t_PADIC  : p-adic numbers    [ cod1 ] [ cod2 ] [ p ] [ p^r ] [ int ]\n\
  t_QUAD   : quadratic numbers [ cod1 ] [ mod  ] [ real ] [ imag ]\n\
  t_POLMOD : poly mod          [ code ] [ mod  ] [ polynomial ]\n\
  -------------------------------------------------------------\n\
  t_POL    : polynomials       [ cod1 ] [ cod2 ] [ man_1 ] ... [ man_k ]\n\
  t_SER    : power series      [ cod1 ] [ cod2 ] [ man_1 ] ... [ man_k ]\n\
  t_RFRAC  : irred. rat. func. [ code ] [ num. ] [ den. ]\n\
  t_RFRACN : rational function [ code ] [ num. ] [ den. ]\n\
  t_QFR    : real qfb          [ code ] [ a ] [ b ] [ c ] [ del ]\n\
  t_QFI    : imaginary qfb     [ code ] [ a ] [ b ] [ c ]\n\
  t_VEC    : row vector        [ code ] [  x_1  ] ... [  x_k  ]\n\
  t_COL    : column vector     [ code ] [  x_1  ] ... [  x_k  ]\n\
  t_MAT    : matrix            [ code ] [ col_1 ] ... [ col_k ]\n\
  t_LIST   : list              [ code ] [ cod2 ] [ x_1 ] ... [ x_k ]\n\
  t_STR    : string            [ code ] [ man_1 ] ... [ man_k ]\n\
\n");
}

static void
menu_commands(void)
{
  pariputs("Help topics:\n\
  0: list of user-defined identifiers (variable, alias, function)\n\
  1: Standard monadic or dyadic OPERATORS\n\
  2: CONVERSIONS and similar elementary functions\n\
  3: TRANSCENDENTAL functions\n\
  4: NUMBER THEORETICAL functions\n\
  5: Functions related to ELLIPTIC CURVES\n\
  6: Functions related to general NUMBER FIELDS\n\
  7: POLYNOMIALS and power series\n\
  8: Vectors, matrices, LINEAR ALGEBRA and sets\n\
  9: SUMS, products, integrals and similar functions\n\
 10: GRAPHIC functions\n\
 11: PROGRAMMING under GP\n\
 12: The PARI community\n\
\n\
Further help (list of relevant functions): ?n (1<=n<=11).\n\
Also:\n\
  ? functionname (short on-line help)\n\
  ?\\             (keyboard shortcuts)\n\
  ?.             (member functions)\n");
  if (has_ext_help()) pariputs("\
Extended help looks available:\n\
  ??             (opens the full user's manual in a dvi previewer)\n\
  ??  tutorial   (same with the GP tutorial)\n\
  ??  refcard    (same with the GP reference card)\n\
\n\
  ??  keyword    (long help text about \"keyword\" from the user's manual)\n\
  ??? keyword    (a propos: list of related functions).");
}

static void
slash_commands(void)
{
  pariputs("#       : enable/disable timer\n\
##      : print time for last result\n\
\\\\      : comment up to end of line\n\
\\a {n}  : print result in raw format (readable by PARI)\n\
\\b {n}  : print result in beautified format\n\
\\c      : list all commands (same effect as ?*)\n\
\\d      : print all defaults\n\
\\e {n}  : enable/disable echo (set echo=n)\n\
\\g {n}  : set debugging level\n\
\\gf{n}  : set file debugging level\n\
\\gm{n}  : set memory debugging level\n\
\\h {m-n}: hashtable information\n\
\\l {f}  : enable/disable logfile (set logfile=f)\n\
\\m {n}  : print result in prettymatrix format\n\
\\o {n}  : change output method (0=raw, 1=prettymatrix, 2=prettyprint)\n\
\\p {n}  : change real precision\n\
\\ps{n}  : change series precision\n\
\\q      : quit completely this GP session\n\
\\r {f}  : read in a file\n\
\\s {n}  : print stack information\n\
\\t      : print the list of PARI types\n\
\\u      : print the list of user-defined functions\n\
\\um     : print the list of user-defined member functions\n\
\\v      : print current version of GP\n\
\\w {nf} : write to a file\n\
\\x {n}  : print complete inner structure of result\n\
\\y {n}  : disable/enable automatic simplification (set simplify=n)\n\
\n\
{f}=optional filename. {n}=optional integer\n");
}

static void
member_commands(void)
{
  pariputs("Member functions, followed by relevant objects\n\n\
a1-a6, b2-b8, c4-c6 : coeff. of the curve.            ell\n\
area : area                                           ell\n\
bnf  : big number field                                        bnf, bnr\n\
clgp : class group                                             bnf, bnr\n\
cyc  : cyclic decomposition (SNF)               clgp           bnf, bnr\n\
diff, codiff: different and codifferent                    nf, bnf, bnr\n\
disc : discriminant                                   ell, nf, bnf, bnr\n\
e, f : inertia/residues degree            prid\n\
fu   : fundamental units                                       bnf, bnr\n\
futu : [u,w] where u=unit group, w=torsion                     bnf, bnr\n\
gen  : generators                         prid, clgp           bnf, bnr\n\
j    : j-invariant                                    ell\n\
mod  : modulus\n\
nf   : number field                                            bnf, bnr\n\
no   : number of elements                       clgp           bnf, bnr\n\
omega, eta: [omega1,omega2] and [eta1, eta2]          ell\n\
p    : rational prime contained in prid   prid\n\
pol  : defining polynomial                                 nf, bnf, bnr\n\
reg  : regulator                                               bnf, bnr\n\
roots: roots                                          ell  nf, bnf, bnr\n\
sign : signature                                           nf, bnf, bnr\n\
t2   : t2 matrix                                           nf, bnf, bnr\n\
tate : Tate's [u^2,u,q]                               ell\n\
tu   : torsion unit and its order                              bnf, bnr\n\
tufu : [w,u] where u=unit group, w=torsion                     bnf, bnr\n\
w    : Mestre's w                                     ell\n\
zk   : integral basis                                      nf, bnf, bnr\n\
zkst : structure of (Z_K/m)^* (valid for idealstar also)            bnr\n");
}

#define QUOTE "_QUOTE"
#define DOUBQUOTE "_DOUBQUOTE"
#define BACKQUOTE "_BACKQUOTE"

static char *
_cat(char *s, char *t)
{
  *s = 0; strcat(s,t); return s + strlen(t);
}

static char *
filter_quotes(char *s)
{
  int i, l = strlen(s);
  int quote = 0;
  int backquote = 0;
  int doubquote = 0;
  char *str, *t;

  for (i=0; i < l; i++) 
    switch(s[i])
    {
      case '\'': quote++; break;
      case '`' : backquote++; break;
      case '"' : doubquote++;
    }
  str = (char*)gpmalloc(l + quote * (strlen(QUOTE)-1)
                          + doubquote * (strlen(DOUBQUOTE)-1)
                          + backquote * (strlen(BACKQUOTE)-1) + 1);
  t = str;
  for (i=0; i < l; i++) 
    switch(s[i])
    {
      case '\'': t = _cat(t, QUOTE); break;
      case '`' : t = _cat(t, BACKQUOTE); break;
      case '"' : t = _cat(t, DOUBQUOTE); break;
      default: *t++ = s[i];
    }
  *t = 0; return str;
}

#define MAX_LINE_LEN 255
static void
external_help(char *s, int num)
{
  long nbli = term_height()-3, li = 0;
  char buf[MAX_LINE_LEN+1], *str, *opt = "", *ar = "";
  pariFILE *z;
  FILE *f;

  if (!help_prg) err(talker,"no external help program");
  s = filter_quotes(s);
  str = gpmalloc(strlen(help_prg) + strlen(s) + 64);
  if (num < 0)
    opt = "-k";
  else if (s[strlen(s)-1] != '@')
    { ar = thestring; sprintf(ar,"@%d",num); }
  sprintf(str,"%s -fromgp %s %c%s%s%c",help_prg,opt, SHELL_Q,s,ar,SHELL_Q);
  z = try_pipe(str,0); f = z->file;
  free(str); free(s);
  while (fgets(buf,MAX_LINE_LEN,f))
  {
    if (!strncmp("ugly_kludge_done",buf,16)) break;
    buf[MAX_LINE_LEN]=0; pariputs(buf);
    if (++li > nbli) { hit_return(); li = 0; }
  }
  pari_fclose(z);
}

char *keyword_list[]={
  "operator",
  "user",
  "member",
  "integer",
  "real",
  "readline",
  "refcard",
  "tutorial",
  "nf",
  "bnf",
  "bnr",
  "ell",
  NULL
};

static int
ok_external_help(char *s)
{
  long n;
  if (!*s) return 1;
  if (!isalpha((int)*s)) return 3; /* operator or section number */
  if (!strncmp(s,"t_",2)) return 2; /* type name */

  for (n=0; keyword_list[n]; n++)
    if (!strcmp(s,keyword_list[n])) return 3;
  return 0;
}

/* don't mess readline display */
static void
aide_err(char *s1, char *s2, int flag)
{
  if ((flag & h_RL) == 0) err(talker, "%s: %s", s1, s2);
  pariputsf("%s: %s\n", s1, s2);
}

static void
aide0(char *s, int flag)
{
  long n, long_help = flag & h_LONG;
  entree *ep,*ep1;

  s = get_sep(s);
  if (isdigit((int)*s))
  {
    n=atoi(s);
    if (n == 12) { community(); return; }
    if (n<0 || n > 12)
      err(talker2,"no such section in help: ?",s,s);
    if (long_help) external_help(s,3); else commands(n);
    return;
  }
  if (flag & h_APROPOS) { external_help(s,-1); return; }
  if (long_help && (n = ok_external_help(s))) { external_help(s,n); return; }
  switch (*s)
  {
    case '*' : commands(-1); return;
    case '\0': menu_commands(); return;
    case '\\': slash_commands(); return;
    case '.' : member_commands(); return;
  }
  ep = is_entry(s);
  if (ep && long_help)
  {
    if (!strcmp(ep->name, "default"))
    {
      char *t = s+7;
      if (*t == '/' && is_default(t+1))
      {
        external_help(t+1, 2);
        return;
      }
    }
  }
  if (!ep)
  {
    n = is_default(s)? 2: 3;
    if (long_help)
      external_help(s,n);
    else
    {
      if (n == 2) { aide_err(s,"default",flag); return; }
      n = whatnow(s,1);
      if (n) err(obsoler,s,s, s,n);
      aide_err(s,"unknown identifier",flag);
    }
    return;
  }

  ep1 = ep;  ep = do_alias(ep);
  if (ep1 != ep) pariputsf("%s is aliased to:\n\n",s);

  switch(EpVALENCE(ep))
  {
    case EpUSER:
      if (!ep->help || long_help) print_user_fun(ep);
      if (!ep->help) return;
      if (long_help) { pariputs("\n\n"); long_help=0; }
      break;

    case EpGVAR:
    case EpVAR:
      if (!ep->help) { aide_err(s, "user defined variable",flag); return; }
      long_help=0; break;

    case EpINSTALL:
      if (!ep->help) { aide_err(s, "installed function",flag); return; }
      long_help=0; break;
  }
  if (long_help) { external_help(ep->name,3); return; }
  if (ep->help) { print_text(ep->help); return; }

  err(bugparier,"aide (no help found)");
}

void
aide(char *s, int flag)
{
  if ((flag & h_RL) == 0)
  {
    if (*s == '?') { flag |= h_LONG; s++; }
    if (*s == '?') { flag |= h_APROPOS; s++; }
  }
  term_color(c_HELP); aide0(s,flag); term_color(c_NONE);
  if ((flag & h_RL) == 0) pariputc('\n');
}

/********************************************************************/
/**                                                                **/
/**                         METACOMMANDS                           **/
/**                                                                **/
/********************************************************************/

static void
print_entree(entree *ep, long hash)
{
  pariputsf(" %s ",ep->name); pariputsf(VOIR_STRING1,(ulong)ep);
  pariputsf(":\n   hash = %3ld, valence = %3ld, menu = %2ld, code = %s\n",
            hash, ep->valence, ep->menu, ep->code? ep->code: "NULL");
  if (ep->next)
  {
    pariputsf("   next = %s ",(ep->next)->name);
    pariputsf(VOIR_STRING1,(ulong)(ep->next));
  }
  pariputs("\n");
}

static void
print_hash_list(char *s)
{
  long m,n;
  entree *ep;

  if (isalpha((int)*s))
  {
    ep = is_entry_intern(s,functions_hash,&n);
    if (!ep) err(talker,"no such function");
    print_entree(ep,n); return;
  }
  if (isdigit((int)*s) || *s == '$')
  {
    m = functions_tblsz-1; n = atol(s);
    if (*s=='$') n = m;
    if (m<n) err(talker,"invalid range in print_entree");
    while (isdigit((int)*s)) s++;

    if (*s++ != '-') m = n;
    else
    {
      if (*s !='$') m = min(atol(s),m);
      if (m<n) err(talker,"invalid range in print_entree");
    }

    for(; n<=m; n++)
    {
      pariputsf("*** hashcode = %ld\n",n);
      for (ep=functions_hash[n]; ep; ep=ep->next)
      print_entree(ep,n);
    }
    return;
  }
  if (*s=='-')
  {
    for (n=0; n<functions_tblsz; n++)
    {
      m=0;
      for (ep=functions_hash[n]; ep; ep=ep->next) m++;
      pariputsf("%3ld:%3ld ",n,m);
      if (n%9 == 8) pariputc('\n');
    }
    pariputc('\n'); return;
  }
  for (n=0; n<functions_tblsz; n++)
    for (ep=functions_hash[n]; ep; ep=ep->next)
      print_entree(ep,n);
}

static char *
what_readline()
{
#ifdef READLINE
 return "v"READLINE" enabled";
#else
  return "disabled";
#endif
}

static void
print_version()
{
  char buf[64];

  center(PARIVERSION); center(PARIINFO);
  sprintf(buf,"(readline %s, extended help%s available)", what_readline(),
          has_ext_help()? "": " not");
  center(buf);
}

static void
gp_head()
{
  print_version(); pariputs("\n");
  center("Copyright (C) 2002 The PARI Group");
  print_text("\nPARI/GP is free software, covered by the GNU General Public \
License, and comes WITHOUT ANY WARRANTY WHATSOEVER");
  pariputs("\n\
Type ? for help, \\q to quit.\n\
Type ?12 for how to get moral (and possibly technical) support.\n\n");
  sd_realprecision  ("",d_ACKNOWLEDGE);
  sd_seriesprecision("",d_ACKNOWLEDGE);
  sd_format         ("",d_ACKNOWLEDGE);
  pariputsf("\nparisize = %ld, primelimit = %ld\n", parisize, primelimit);
}

static void
fix_buffer(Buffer *b, long newlbuf)
{
  b->buf = gprealloc(b->buf, newlbuf, b->len);
  b->len = paribufsize = newlbuf;
}

void
gp_quit()
{
  free_graph(); freeall();
  kill_all_buffers(NULL);
  if (INIT_SIG) pari_sig_init(SIG_DFL);
  term_color(c_NONE);
  pariputs_opt("Good bye!\n");
  if (under_texmacs) tm_end_output();
  exit(0);
}

/* history management function:
 *   flag < 0, called from freeall()
 *   flag = 0, called from %num in anal.c:truc()
 *   flag > 0, called from %` in anal.c:truc(), p > 0
 */
static GEN
gp_history(long p, long flag, char *old, char *entrypoint)
{
  int er1 = 0;
  if (flag < 0) { free((void *)hist); return NULL; }
  if (!tglobal) er1 = 1;
  if (flag)
  {
    p = tglobal - p;
    if (p <= 0) er1 = 1;
  }
  else if (p > tglobal)
    err(talker2,"I can't see into the future",old,entrypoint);
  if (!p) p = tglobal;
  if (tglobal - p >= histsize) er1 = 1;
  p = (p-1) % histsize;
  if (er1 || !hist[p])
    err(talker2,"I can't remember before the big bang",old,entrypoint);
  return hist[p];
}

extern char *GENtostr0(GEN x, void(*do_out)(GEN));

static void
texmacs_output(GEN z, long n)
{
  char *sz = GENtostr0(z, &outtex);
  printf("%clatex:", DATA_BEGIN);
  printf("\\magenta\\%%%ld = $\\blue ", n);
  printf("%s$%c", sz,DATA_END); free(sz);
  fflush(stdout);
}

/* Wait for prettyprinter for finish, to prevent new prompt from overwriting
 * the output.  Fill the output buffer, wait until it is read.
 * Better than sleep(2): give possibility to print */
static void
prettyp_wait()
{
  char *s = "                                                     \n";
  int i = 400;

  pariputs("\n\n"); pariflush(); /* start translation */
  while (--i) pariputs(s);
  pariputs("\n"); pariflush();
}

/* initialise external prettyprinter (tex2mail) */
static int
prettyp_init()
{
  if (!prettyprinter_file)
    prettyprinter_file = try_pipe(prettyprinter, mf_OUT | mf_TEST);
  if (prettyprinter_file) return 1;

  err(warner,"broken prettyprinter: '%s'",prettyprinter);
  if (prettyprinter != prettyprinter_dft) free(prettyprinter);
  prettyprinter = NULL; return 0;
}

/* n = history number. if n = 0 no history */
static int
tex2mail_output(GEN z, long n)
{
  FILE *o_out;
  int o_prettyp;
  
  if (!(prettyprinter && prettyp_init())) return 0;
  o_out = pari_outfile; /* save state */
  o_prettyp = prettyp;

  /* Emit first: there may be lines before the prompt */
  if (n) term_color(c_OUTPUT);
  pariflush();
  pari_outfile = prettyprinter_file->file;
  prettyp = f_TEX;

  /* history number */
  if (n)
  {
    if (*term_get_color(c_HIST) || *term_get_color(c_OUTPUT))
    {
      char col1[80];
      strcpy(col1, term_get_color(c_HIST));
      sprintf(thestring, "\\LITERALnoLENGTH{%s}\\%%%ld = \\LITERALnoLENGTH{%s}",
              col1, n, term_get_color(c_OUTPUT));
    }
    else
      sprintf(thestring, "\\%%%ld = ", n);
    pariputs_opt(thestring);
  }
  /* output */
  gp_output(z);

  /* flush and restore */
  prettyp_wait();
  prettyp = o_prettyp;
  pari_outfile = o_out;
  if (n) term_color(c_NONE);
  return 1;
}

static void
normal_output(GEN z, long n)
{
  /* history number */
  term_color(c_HIST);
  sprintf(thestring, "%%%ld = ", n);
  pariputs_opt(thestring);
  /* output */
  term_color(c_OUTPUT);
  init_lim_lines(thestring,lim_lines);
  gp_output(z);
  init_lim_lines(NULL,lim_lines);
  term_color(c_NONE); pariputc('\n');
}

static void
escape(char *tch)
{
  char *s, c;

  if (compatible != NONE)
  {
    s = tch;
    while (*s)
      if (*s++ == '=')
      {
      GEN (*f)(char*, int) = NULL;
      int len = (s-tch) - 1;
      
      if (!strncmp(tch,"precision",len))         f = sd_realprecision;
      else if (!strncmp(tch,"serieslength",len)) f = sd_seriesprecision;
      else if (!strncmp(tch,"format",len))       f = sd_format;
      else if (!strncmp(tch,"prompt",len))       f = sd_prompt;
      if (f) { f(get_sep(s), d_ACKNOWLEDGE); return; }
      break;
      }
  }
  s = tch;
  switch ((c = *s++))
  {
    case 'w': case 'x': case 'a': case 'b': case 'B': case 'm':
    { /* history things */
      long d;
      GEN x;
      if (c != 'w' && c != 'x') d = get_int(s,0);
      else
      {
      d = atol(s); if (*s == '-') s++;
      while (isdigit((int)*s)) s++;
      }
      x = gp_history(d, 0, tch+1,tch-1);
      switch (c)
      {
      case 'a': brute   (x, fmt.format, -1); break;
      case 'm': matbrute(x, fmt.format, -1); break;
      case 'B': if (tex2mail_output(x,0)) return;  /* fall through */
      case 'b': sor     (x, fmt.format, -1, fmt.field); break;
      case 'x': voir(x, get_int(s, -1)); 
        case 'w':
      {
        GEN g[2]; g[0] = x; g[1] = NULL;
        s = get_sep(s); if (!*s) s = current_logfile;
        write0(s, g, f_RAW); return;
      }
      }
      pariputc('\n'); return;
    }

    case 'c': commands(-1); break;
    case 'd': help_default(); break;
    case 'e':
      s = get_sep(s);
      if (!*s) s = pariecho?"0":"1";
      sd_echo(s,d_ACKNOWLEDGE); break;
    case 'g':
      switch (*s)
      {
        case 'm': sd_debugmem(++s,d_ACKNOWLEDGE); break;
        case 'f': sd_debugfiles(++s,d_ACKNOWLEDGE); break;
        default : sd_debug(s,d_ACKNOWLEDGE); break;
      }
      break;
    case 'h': print_hash_list(s); break;
    case 'l':
      s = get_sep(s);
      if (*s)
      {
        sd_logfile(s,d_ACKNOWLEDGE);
        if (logfile) break;
      }
      sd_log(logfile?"0":"1",d_ACKNOWLEDGE);
      break;
    case 'o': sd_output(s,d_ACKNOWLEDGE); break;
    case 'p':
      switch (*s)
      {
        case 's': sd_seriesprecision(++s,d_ACKNOWLEDGE); break;
        default : sd_realprecision(s,d_ACKNOWLEDGE); break;
      }
      break;
    case 'q': gp_quit(); break;
    case 'r': switchin(get_sep(s)); break;
    case 's': etatpile(0); break;
    case 't': gentypes(); break;
    case 'u':
      switch (*s)
      {
        case 'm': user_member(); break;
        default: user_fun();
      }
      break;
    case 'v': print_version(); break;
    case 'y':
      s = get_sep(s);
      if (!*s) s = simplifyflag?"0":"1";
      sd_simplify(s,d_ACKNOWLEDGE); break;
    default: err(caracer1,tch-1,tch-2);
  }
}

/********************************************************************/
/*                                                                  */
/*                              GPRC                                */
/*                                                                  */
/********************************************************************/
#if defined(UNIX) || defined(__EMX__)
#  include <pwd.h>
#endif

#define err_gprc(s,t,u) { fprintferr("\n"); err(talker2,s,t,u); }

static ulong
read_uint(char **s)
{
  long v = atol(*s);
  if (!isdigit((int)**s)) err_gprc("not an integer", *s, *s);
  while (isdigit((int)**s)) (*s)++;
  return v;
}
static ulong
read_dot_uint(char **s)
{
  if (**s != '.') return 0;
  (*s)++; return read_uint(s);
}
/* read a.b.c */
static long
read_version(char **s)
{
  long a, b, c;
  a = read_uint(s);
  b = read_dot_uint(s);
  c = read_dot_uint(s);
  return PARI_VERSION(a,b,c);
}

static int
get_preproc_value(char **s)
{
  if (!strncmp(*s,"EMACS",5)) 
  {
    *s += 5;
    return under_emacs || under_texmacs;
  }
  if (!strncmp(*s,"READL",5))
  {
    *s += 5;
#ifdef READLINE
    return 1;
#else
    return 0;
#endif
  }
  if (!strncmp(*s,"VERSION",7))
  {
    int less = 0, orequal = 0;
    long d;
    *s += 7;
    switch(**s)
    {
      case '<': (*s)++; less = 1; break;
      case '>': (*s)++; less = 0; break;
      default: return -1;
    }
    if (**s == '=') { (*s)++; orequal = 1; }
    d = PARI_VERSION_CODE - read_version(s);
    if (!d) return orequal;
    return less? (d < 0): (d > 0);
  }
  return -1;
}

/* return $HOME or the closest we can find */
static char *
get_home(int *free_it)
{
#ifdef WINCE
  return ".";
#else
#ifndef macintosh /* getenv() for Mac ? */
  char *drv, *pth = getenv("HOME");
  if (pth) return pth;
  if ((drv = getenv("HOMEDRIVE"))
   && (pth = getenv("HOMEPATH")))
  { /* looks like WinNT */
    char *buf = gpmalloc(strlen(pth) + strlen(drv) + 1);
    sprintf(buf, "%s%s",drv,pth);
    *free_it = 1; return buf;
  }
#endif
#endif
#if defined(__EMX__) || defined(UNIX)
  {
    struct passwd *p = getpwuid(geteuid());
    if (p) return p->pw_dir;
  }
#endif
  return ".";
}

static FILE *
gprc_chk(char *s)
{
  FILE *f = fopen(s, "r");
  if (f && !quiet_mode)
  {
    fprintferr("Reading GPRC: %s ...", s);
    added_newline = 0;
  }
  return f;
}

/* Look for [._]gprc: $GPRC, then in $HOME, /, C:/ */
static FILE *
gprc_get()
{
  FILE *f = NULL;
  char *str, *s, c;
  long l;
#ifdef macintosh
  f = gprc_chk("gprc");
#else
#ifdef WINCE
  s = NULL;
#else
  s = getenv("GPRC");
#endif
  if (s) f = gprc_chk(s);
  if (!f)
  {
    int free_it = 0;
    s = get_home(&free_it); l = strlen(s); c = s[l-1];
    str = strcpy(gpmalloc(l+7), s);
    if (free_it) free(s);
    s = str + l;
    if (c != '/' && c != '\\') *s++ = '/';
#ifdef UNIX
    *s = '.'; /* .gprc */
#else
    *s = '_'; /* _gprc */
#endif
    strcpy(s+1, "gprc");
    f = gprc_chk(str); /* in $HOME */
    if (!f) f = gprc_chk(s); /* in . */
    if (!f) f = gprc_chk("/etc/gprc");
    if (!f) f = gprc_chk("C:/_gprc");
    free(str);
  }
#endif
  return f;
}

static int
init_brace(char *s)
{
  while (isspace((int)*s)) s++;
  if (*s == LBRACE) { *s=' '; return 1; }
  return 0;
}

/* return 1 if we deleted a '{' */
static int
init_filtre(char *s)
{
  if (filtre(s, f_INIT)) return 0; /* in comment */
  return init_brace(s);
}

/* prompt = NULL --> from gprc */
static int
get_line_from_file(FILE *file, Buffer *b, char *prompt)
{
  int f_flag = prompt? f_REG: f_REG| f_KEEPCASE;
  int wait_for_brace, wait_for_input;
  long len = b->len;
  char *s =  b->buf;

  if (under_texmacs && file == stdin) tm_end_output();
  handle_C_C = 0;
  if (!fgets(s, len, file))
  { 
    if (under_texmacs && file == stdin) tm_start_output();
    /* received ^C  in fgets, give another chance */
    if (handle_C_C) { *s = 0; return 1; }
    return 0;
  }

  wait_for_input = wait_for_brace = init_filtre(s);
  for(;;)
  {
    int read_more = (s[strlen(s)-1] != '\n');
    char *end = filtre(s, f_flag);
    if (!*s) { if (!wait_for_input) break; }
    else
    {
      if (read_more)
      {
        s = end;
      if (wait_for_brace && end[-1] == RBRACE) end[-1]=0;
      }
      else if (end[-1] == '\\')
      {
        if (*s == '?') break;
        s = end-1;
      }
      else if (end[-1] == '=' && *s != '?')
      {
        wait_for_input = 1; s = end;
      }
      else
      {
      if (!wait_for_brace) break;
      if (end[-1] == RBRACE) { end[-1]=0; break; }
      s = end;
      }
      len = b->len - (s - b->buf);
      if (len < 512)
      {
      long n = b->len << 1, l = s - b->buf;
      len += b->len; fix_buffer(b, n);
      s = b->buf + l;
      }
    }
    if (under_texmacs && file == stdin)
    { /* need more data from TeXmacs */
      tm_start_output();
      tm_end_output(); 
    }
    if (!fgets(s, len, file)) break;
    if (wait_for_input && !wait_for_brace)
      wait_for_brace = init_filtre(s);
  }
  if (prompt && *(b->buf))
  {
    if (pariecho) { pariputs(prompt); pariputs(b->buf); pariputc('\n'); }
    else if (logfile) fprintf(logfile, "%s%s\n",prompt,b->buf);
    pariflush();
  }
  if (under_texmacs) tm_start_output();
  return 1;
}

static char **
gp_initrc()
{
  char **flist, *s,*s1,*s2;
  FILE *file = gprc_get();
  long fnum = 4, find = 0;
  Buffer *b;

  if (!file) return NULL;
  flist = (char **) gpmalloc(fnum * sizeof(char*));
  b = new_buffer();
  for(;;)
  {
    if (! get_line_from_file(file, b, NULL))
    {
      del_buffer(b);
      if (!quiet_mode) fprintferr("Done.\n\n");
      fclose(file); flist[find] = NULL;
      return flist;
    }
    for (s = b->buf; *s; )
    {
      s1 = s; if (get_sep2(s)) s++;
      s += strlen(s1); /* point to next expr */
      if (*s1 == '#')
      { /* preprocessor directive */
        int z, NOT = 0;
        s1++;
        if (strncmp(s1,"if",2)) err_gprc("unknown directive",s1,b->buf);
        s1 += 2;
        if (!strncmp(s1,"not",3)) { NOT = !NOT; s1 += 3; }
        if (*s1 == '!')           { NOT = !NOT; s1++; }
        z = get_preproc_value(&s1);
      if (z < 0) err_gprc("unknown preprocessor variable",s1,b->buf);
      if (NOT) z = !z;
        if (!z) continue;
      }
      if (!strncmp(s1,"read",4))
      { /* read file */
      s1 += 4;
      if (find == fnum-1)
      {
        long n = fnum << 1;
        flist = (char**)gprealloc(flist, n*sizeof(char*),
                                         fnum*sizeof(char*));
        fnum = n;
      }
      flist[find++] = s2 = gpmalloc(strlen(s1) + 1);
      if (*s1 == '"') (void)readstring(s1, s2);
      else strcpy(s2,s1);
      }
      else
      { /* set default */
      s2 = s1; while (*s2 && *s2 != '=') s2++;
      if (*s2 != '=') err_gprc("missing '='",s2,b->buf);
      *s2++ = 0;
      if (*s2 == '"') (void)readstring(s2, s2);
      setdefault(s1,s2,d_INITRC);
      }
    }
  }
}

/********************************************************************/
/*                                                                  */
/*                           GP MAIN LOOP                           */
/*                                                                  */
/********************************************************************/
/* flag:
 *   ti_NOPRINT   don't print
 *   ti_REGULAR   print elapsed time (chrono = 1)
 *   ti_LAST      print last elapsed time (##)
 *   ti_INTERRUPT received a SIGINT
 */
static char *
do_time(long flag)
{
  static long last = 0;
  long delay = (flag == ti_LAST)? last: gptimer();
  char *s;

  last = delay;
  switch(flag)
  {
    case ti_REGULAR:   s = "time = "; break;
    case ti_INTERRUPT: s = "user interrupt after "; break;
    case ti_LAST:      s = "  ***   last result computed in "; break;
    default: return NULL;
  }
  strcpy(thestring,s); s=thestring+strlen(s);
  strcpy(s, term_get_color(c_TIME)); s+=strlen(s);
  if (delay >= 3600000)
  {
    sprintf(s, "%ldh, ", delay / 3600000); s+=strlen(s);
    delay %= 3600000;
  }
  if (delay >= 60000)
  {
    sprintf(s, "%ldmn, ", delay / 60000); s+=strlen(s);
    delay %= 60000;
  }
  if (delay >= 1000)
  {
    sprintf(s, "%ld,", delay / 1000); s+=strlen(s);
    delay %= 1000;
    if (delay < 100)
    {
      sprintf(s, "%s", (delay<10)? "00": "0");
      s+=strlen(s);
    }
  }
  sprintf(s, "%ld ms", delay); s+=strlen(s);
  strcpy(s, term_get_color(c_NONE));
  if (flag != ti_INTERRUPT) { s+=strlen(s); *s++='.'; *s++='\n'; *s=0; }
  return thestring;
}

static void
gp_handle_SIGINT()
{
#ifdef _WIN32
  if (++win32ctrlc >= 5) _exit(3);
#else
  if (under_texmacs) tm_start_output();
  err(siginter, do_time(ti_INTERRUPT));
#endif
}

static void
gp_sighandler(int sig)
{
  char *msg;
  os_signal(sig,gp_sighandler);
  switch(sig)
  {
#ifdef SIGBREAK
    case SIGBREAK: gp_handle_SIGINT(); return;
#endif
#ifdef SIGINT
    case SIGINT: gp_handle_SIGINT(); return;
#endif

#ifdef SIGSEGV
    case SIGSEGV:
      msg="GP (Segmentation Fault)";
      break;
#endif

#ifdef SIGBUS
    case SIGBUS:
      msg="GP (Bus Error)";
      break;
#endif

#ifdef SIGFPE
    case SIGFPE:
      msg="GP (Floating Point Exception)";
      break;
#endif

#ifdef SIGPIPE
    case SIGPIPE:
      if (prettyprinter_file && pari_outfile == prettyprinter_file->file)
      {
        pariFILE *f = prettyprinter_file;
        prettyprinter_file = NULL; /* to avoid oo recursion on error */
        pari_outfile = stdout; pari_fclose(f);
      }
      err(talker, "Broken Pipe, resetting file stack...");
#endif

    default:
      msg="signal handling";
  }
  err(bugparier,msg);
}

static void
brace_color(char *s, int c, int force)
{
  if (disable_color || (gp_colors[c] == c_NONE && !force)) return;
#ifdef RL_PROMPT_START_IGNORE
  *s++ = RL_PROMPT_START_IGNORE;
#endif
  strcpy(s, term_get_color(c));
#ifdef RL_PROMPT_START_IGNORE
  s+=strlen(s);
  *s++ = RL_PROMPT_END_IGNORE; *s = 0;
#endif
}

static char *
do_prompt()
{
  static char buf[MAX_PROMPT_LEN + 24]; /* + room for color codes */
  char *s;
  
  if (test_mode) return prompt;
  s = buf; *s = 0;
  /* escape sequences bug readline, so use special bracing (if available) */
  brace_color(s, c_PROMPT, 0);
  s += strlen(s);
  if (filtre(s, f_COMMENT)) 
    strcpy(s, COMMENTPROMPT);
  else
    do_strftime(prompt,s);
  s += strlen(s);
  brace_color(s, c_INPUT, 1); return buf;
}

static int
read_line(char *promptbuf, Buffer *b)
{
  if (infile == stdin /* interactive use */
     && !under_texmacs
#if defined(UNIX) || defined(__EMX__)
     && (under_emacs || isatty(fileno(stdin)))
#endif
  )
  {
#ifdef READLINE
    static char *previous_hist = NULL;
    char *rlbuffer = readline(promptbuf), *s = b->buf;
    int wait_for_brace, wait_for_input;

    if (!rlbuffer) { pariputs("\n"); return 0; } /* EOF */
    wait_for_input = wait_for_brace = init_filtre(rlbuffer);
    for(;;)
    {
      long len = s - b->buf;
      char *end = filtre(rlbuffer, f_READL);
      long l = end - rlbuffer;

      if (len + l > b->len)
      {
      fix_buffer(b, len+l+1);
      s = b->buf + len;
      }
      strcpy(s,rlbuffer);
      if (!*s) { if (!wait_for_input) break; }
      else
      {
      s += l-1; /* *s = last input char */
      if (wait_for_brace && *s == RBRACE) {*s=0; break;}
      if (*s == '\\')
        {
          if (*rlbuffer == '?') break;
        }
        else if (*s == '=' && s[1-l] != '?')
        {
          wait_for_input = 1; s++;
        }
        else
      {
        if (!wait_for_brace) break;
        s++;
      }
      }
      free(rlbuffer);
      /* read continuation line */
      if (!(rlbuffer = readline(""))) break;
      if (wait_for_input && !wait_for_brace)
        wait_for_brace = init_brace(rlbuffer);
    }
    /* bug in readline 2.0: need to unblock ^C */
# ifdef USE_SIGRELSE
    sigrelse(SIGINT);
# elif USE_SIGSETMASK
    sigsetmask(0);
# endif
    s = b->buf;
    if (*s)
    {
      /* update history (don't add the same entry twice) */
      if (!previous_hist || strcmp(s,previous_hist))
      {
      if (previous_hist) free(previous_hist);
      previous_hist = pari_strdup(s); add_history(s);
      }
      /* update logfile */
      if (logfile) fprintf(logfile, "%s%s\n",promptbuf,s);
    }
    return 1;
#else
    pariputs(promptbuf);
#endif /* defined(READLINE) */
  }
  else promptbuf = DFT_PROMPT;
  return get_line_from_file(infile, b, promptbuf);
}

static void
chron(char *s)
{
  if (*s)
  {
    char *old = s-1;
    if (*s == '#') { pariputs(do_time(ti_LAST)); s++; }
    if (*s) err(caracer1,s,old);
  }
  else { chrono = 1-chrono; sd_timer("",d_ACKNOWLEDGE); }
}

static int
check_meta(char *buf)
{
  switch(*buf++)
  {
    case '?': aide(buf, h_REGULAR); break;
    case '#': chron(buf); break;
    case '\\': escape(buf); break;
    case '\0': return 2;
    default: return 0;
  }
  return 1;
}

/* If there are other buffers open (bufstack != NULL), we are doing an
 * immediate read (with read, extern...) */
static GEN
gp_main_loop(int ismain)
{
  long av, i,j;
  VOLATILE GEN z = gnil;
  Buffer *b = new_buffer();
  if (!setjmp(b->env))
  {
    b->flenv = 1;
    push_stack(&bufstack, (void*)b);
  }
  for(; ; setjmp(b->env))
  {
    if (ismain)
    {
      static long tloc, outtyp;
      tloc = tglobal; outtyp = prettyp; recover(0);
      if (setjmp(environnement))
      {
        char *s = (char*)global_err_data;
        if (s && *s) outerr(lisseq(s));
      avma = top; parisize = top - bot;
      j = tglobal - tloc; i = (tglobal-1)%histsize;
      while (j)
      {
        gunclone(hist[i]); hist[i]=NULL;
        if (!i) i = histsize;
        i--; j--;
      }
        tglobal = tloc; prettyp = outtyp;
        kill_all_buffers(b);
      }
    }
    added_newline = 1;
    if (paribufsize != b->len) fix_buffer(b, paribufsize);

    for(;;)
    {
      int r;
      r = read_line(do_prompt(), b);
      term_color(c_NONE);
      if (!r)
      {
#ifdef _WIN32
      Sleep(10); if (win32ctrlc) dowin32ctrlc();
#endif
      if (popinfile()) gp_quit();
      if (!ismain) { pop_buffer(); return z; }
      }
      else if (!check_meta(b->buf)) break;
    }
    if (ismain)
    {
      char c = b->buf[strlen(b->buf) - 1];
      gpsilent = separe(c);
      (void)gptimer();
    }
    av = avma;
    z = readseq(b->buf, strictmatch);
    if (!added_newline) pariputc('\n'); /* last output was print1() */
    if (! ismain) continue;
    if (chrono) pariputs(do_time(ti_REGULAR)); else do_time(ti_NOPRINT);
    if (z == gnil) continue;

    if (simplifyflag) z = simplify_i(z);
    i = tglobal % histsize; tglobal++;
    if (hist[i]) gunclone(hist[i]);
    hist[i] = z = gclone(z); avma = av;
    if (gpsilent) continue;

    if (test_mode) { init80(0); gp_output(z); pariputc('\n'); }
    else
    {
      if (under_texmacs)
        texmacs_output(z,tglobal);
      else if (prettyp != f_PRETTY || !tex2mail_output(z,tglobal))
        normal_output(z,tglobal);
    }
    pariflush();
  }
}

GEN
read0(char *s)
{
  switchin(s);
  return gp_main_loop(0);
}

static void
check_secure(char *s)
{
  if (secure)
    err(talker, "[secure mode]: system commands not allowed\nTried to run '%s'",s);
}

GEN
extern0(char *s)
{
  check_secure(s);
  infile = try_pipe(s, mf_IN)->file;
  return gp_main_loop(0);
}

static int
silent()
{
  if (gpsilent) return 1;
  { char c = _analyseur()[1]; return separe(c); }
}

GEN
default0(char *a, char *b, long flag)
{
  if (flag) flag=d_RETURN;
  else
    flag = silent()? d_SILENT: d_ACKNOWLEDGE;
  return setdefault(a,b,flag);
}

GEN
input0()
{
  Buffer *b = new_buffer();
  GEN x;

  push_stack(&bufstack, (void*)b);
  while (! get_line_from_file(infile, b, DFT_INPROMPT))
    if (popinfile()) { fprintferr("no input ???"); gp_quit(); }
  x = lisseq(b->buf);
  pop_buffer(); return x;
}

void
system0(char *s)
{
#if defined(UNIX) || defined(__EMX__)
  check_secure(s);
  system(s);
#else
  err(archer);
#endif
}

void
error0(GEN *g)
{
  term_color(c_ERR);
  if (!added_newline) pariputc('\n');
  pariputs("###   User error:\n\n   ");
  print0(g,f_RAW); term_color(c_NONE);
  err_recover(talker);
}

void errcontext(char *msg, char *s, char *entry);

int
break_loop(long numerr)
{
  static FILE *oldinfile = NULL;
  static char *old = NULL;
  static Buffer *b = NULL;
  VOLATILE int go_on = 0;
  char *s, *t, *msg;

  if (b) jump_to_given_buffer(b);
  push_stack(&bufstack, (void*)new_buffer());
  b = current_buffer; /* buffer created above */
  if (setjmp(b->env))
  {
    msg = "back to break loop";
    s = t = NULL;
  }
  else
  {
    Buffer *oldb = (Buffer*)bufstack->prev->value;
    msg = "Starting break loop (type 'break' to go back to GP)";
    old = s = _analyseur();
    t = oldb->buf;
    /* something fishy, probably a ^C, or we overran analyseur */
    if (!s || !s[-1] || s < t || s >= t + oldb->len) s = NULL;
    b->flenv = 1; oldinfile = infile;
  }

  term_color(c_ERR); fprintferr("\n");
  errcontext(msg, s, t);
  term_color(c_NONE);
  if (numerr == siginter) pariputs("['' or 'next' will continue]\n");
  infile = stdin;
  for(;;)
  {
    int flag;
    if (! read_line("> ", b)) break;
    if (!(flag = check_meta(b->buf)))
    {
      GEN x = lisseq(b->buf);
      if (did_break())
      {
        if (numerr == siginter && did_break() == br_NEXT)
        {
          (void)loop_break(); /* clear status flag */
          go_on = 1;
        }
        break;
      }
      if (x == gnil) continue;

      term_color(c_OUTPUT);
      gp_output(x);
      term_color(c_NONE);
      pariputc('\n');
    }
    if (numerr == siginter && flag == 2) { handle_C_C = go_on = 1; break; }
  }
  if (old && !s) _set_analyseur(old);
  b = NULL; infile = oldinfile;
  pop_buffer(); return go_on;
}

int
gp_exception_handler(long numerr)
{
  char *s = (char*)global_err_data;
  if (s && *s) { fprintferr("\n"); outerr(lisseq(s)); }
  else
  {
    if (numerr == errpile) avma = top;
    return break_loop(numerr);
  }
  return 0;
}

long
setprecr(long n)
{
  long m = fmt.nb;

  if (n>0) {fmt.nb = n; prec = (long)(n*pariK1 + 3);}
  return m;
}

static void
testint(char *s, long *d)
{
  if (!s) return;
  *d = get_int(s, 0);
  if (*d <= 0) err(talker,"arguments must be positive integers");
}

static char *
read_arg(int *nread, char *t, long argc, char **argv)
{
  int i = *nread;
  if (isdigit((int)*t)) return t;
  if (*t || i==argc) usage(argv[0]);
  *nread = i+1; return argv[i];
}

static char**
read_opt(long argc, char **argv)
{
  char *b=NULL, *p=NULL, *s=NULL, **pre;
  int i=1, initrc=1;

  pari_outfile=stderr;
  while (i<argc)
  {
    char *t = argv[i++];

    if (*t++ != '-') usage(argv[0]);
    switch(*t++)
    {
      case 'b': b = read_arg(&i,t,argc,argv); break;
      case 'p': p = read_arg(&i,t,argc,argv); break;
      case 's': s = read_arg(&i,t,argc,argv); break;

      case 'e':
      if (strncmp(t,"macs",4)) usage(argv[0]);
        under_emacs = 1; break;
      case 'q':
        quiet_mode = 1; break;
      case 't':
      if (strncmp(t,"est",3)) usage(argv[0]);
        disable_color = 1; test_mode = 1; /* fall through */
      case 'f':
      initrc = 0; break;
      case '-':
        if (strcmp(t, "version") == 0) { print_version(); exit(0); }
        if (strcmp(t, "texmacs") == 0) { under_texmacs = 1; break; }
       /* fall through */
      default:
      usage(argv[0]);
    }
  }
  if (under_texmacs) tm_start_output();
  pre = initrc? gp_initrc(): NULL;

  /* override the values from gprc */
  testint(b, &paribufsize); if (paribufsize < 10) paribufsize = 10;
  testint(p, &primelimit);
  testint(s, &parisize);
  if (under_emacs || under_texmacs) disable_color=1;
  pari_outfile=stdout; return pre;
}

#ifdef WINCE
int
WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
        LPWSTR lpCmdLine, int nShowCmd)
{
  char **argv = NULL;
  int argc = 1;
#else
int
main(int argc, char **argv)
{
#endif
  char **flist;

  init_defaults(1); gp_preinit(1);
  if (setjmp(environnement))
  {
    pariputs("### Errors on startup, exiting...\n\n");
    exit(1);
  }
#ifdef __MWERKS__
  argc = ccommand(&argv);
#endif
  flist = read_opt(argc,argv);
  pari_addfunctions(&pari_modules, functions_gp,helpmessages_gp);
  pari_addfunctions(&pari_modules, functions_highlevel,helpmessages_highlevel);
  pari_addfunctions(&pari_oldmodules, functions_oldgp,helpmessages_oldgp);

  init_graph(); INIT_SIG_off;
  pari_init(parisize, primelimit);
  INIT_SIG_on;
  pari_sig_init(gp_sighandler);
#ifdef READLINE
  init_readline();
#endif
  gp_history_fun = gp_history;
  whatnow_fun = whatnow;
  output_fun = gp_output;
  default_exception_handler = gp_exception_handler;
  gp_expand_path(path);

  if (!quiet_mode) gp_head();
  if (flist)
  {
    long c=chrono, e=pariecho;
    FILE *l=logfile;
    char **s = flist;
    chrono=0; pariecho=0; logfile=NULL;
    for ( ; *s; s++) { read0(*s); free(*s); }
    chrono=c; pariecho=e; logfile=l; free(flist);
  }
  (void)gptimer(); (void)timer(); (void)timer2();
  (void)gp_main_loop(1);
  gp_quit(); return 0; /* not reached */
}

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