File: yio.c

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/*
    YIO.C
    Implement Yorick I/O functions.

    $Id: yio.c,v 1.1 1993/08/27 18:32:09 munro Exp $
 */
/*    Copyright (c) 1994.  The Regents of the University of California.
                    All rights reserved.  */

#include "yio.h"
#include "defstr.h"
#include "defmem.h"

#include "ydata.h"

/* Print action defined here */
extern VMaction Print;

extern UnaryOp EvalFN, EvalBI;   /* required by Print */
extern BuiltIn Y_print, Y_print_format;

/* required by print() called as function */
extern Array *GrowArray(Array *array, long extra);

extern char *MakeErrorLine(long lineNumber, const char *filename);

/* Non-blocking input tester defined in sysdep.c */
extern int YstdinNB(int noWait);

/*--------------------------------------------------------------------------*/

extern char *GetRFName(RangeFunc *rfTarget);

extern long ReopenSource(long index, int notExtern);
extern int YpParse(void *func);

/*--------------------------------------------------------------------------*/

/* Yorick wrappers for fgets, feof, and ferror deal with case that
   stream==0, which is interpreted as a fancy case of stream==stdin.
   This allows more sophistocated input models than the standard C
   library.  The ability to not block X windows events is one example.  */

char *Yfgets(char *s, int n, FILE *stream)
{
  if (stream) return fgets(s, n, stream);
  else return YgetsIn(s, n);
}

int Yfeof(FILE *stream)
{
  if (stream) return feof(stream);
  else return 0;
}

int Yferror(FILE *stream)
{
  if (stream) return ferror(stream);
  else return 0;
}

static int gets_err_count= 0;

char *YDgetsIn(char *s, int n)
{
  char *line;
  /* Allow other input to trigger actions which do not require the
     Yorick interpreter, but always wait until standard input is
     ready to deliver the next line.  */
  if (YDispatch) do YDispatch(); while (!yPendingIn);
  line= fgets(s, n, stdin);
  if (!line) {
    *s= '\0';
    clearerr(stdin);
    gets_err_count++;
    if (gets_err_count>3) YError("(FATAL) unable to read stdin");
  } else {
    gets_err_count= 0;
  }
  return line;
}

int YDPrompt(const char *s)
{
  /* Note <stdio.h> might not contain any prototype for fputs or fflush,
     or it might contain the correct ANSI prototype, or it might contain
     a K+R style function declaration...  */
  int val= fputs(s, stdout);
  fflush(stdout);
  return val;
}

int YDputsOut(const char *s)
{
  /* Note <stdio.h> might not contain any prototype for fputs or fflush,
     or it might contain the correct ANSI prototype, or it might contain
     a K+R style function declaration...  */
  int val= fputs(s, stdout);
  val|= fputs("\n", stdout);
  fflush(stdout);
  return val;
}

int YDputsErr(const char *s)
{
  /* Note <stdio.h> might not contain any prototype for fputs or fflush,
     or it might contain the correct ANSI prototype, or it might contain
     a K+R style function declaration...  */
  int val= fputs(s, stderr);
  val|= fputs("\n", stderr);
  fflush(stderr);
  return val;
}

char *(*YgetsIn)(char *s, int n)= &YDgetsIn;
int (*YPrompt)(const char *s)= &YDPrompt;
int (*YputsOut)(const char *s)= &YDputsOut;
int (*YputsErr)(const char *s)= &YDputsErr;

int yPendingIn= 0;

void YDDispatch(void)
{
  extern int yBatchMode;
  if (yBatchMode) YError("attempt to read keyboard in batch mode");
  yPendingIn= YstdinNB(0);
}

void YDMaybeDispatch(void)
{
  yPendingIn= YstdinNB(1);
}

void (*YDispatch)(void)= &YDDispatch;
void (*YMaybeDispatch)(void)= &YDMaybeDispatch;

/*--------------------------------------------------------------------------*/
/* Yorick interface to gets() allows for virtually unlimited length lines.
   The price is the necessity of passing a struct* instead of a simple
   char*...  The case of file==0 is special -- file==0 means "stdin",
   but Yorick allows for the possibility of more complex arrangements
   for "stdin", including the possibility that keyboard input stream
   is not coming from a standard C library input stream at all (it could
   come, e.g., from some sort of X window message).  */
#define MIN_LINE 256
#define BIG_LINE 1024
#define MAX_LINE 16384
#define INC_LINE 256

char *Ygets(YgetsLine *getsLine, FILE *file)
{
  char *prev, *line= getsLine->line;
  int n, maxChars= getsLine->max;

  if (maxChars<MIN_LINE || maxChars>BIG_LINE) {
    StrFree(line);
    getsLine->line= line= StrAlloc(MIN_LINE);
    getsLine->max= maxChars= MIN_LINE;
    line[maxChars]= '\0';   /* just in case... */
  }

  /* Take care not to try to read a stream that has already returned EOF.  */
  if (Yfeof(file) ||
      !Yfgets(line, maxChars+1, file) ||
      Yferror(file)) goto abort;

  n= strlen(line);
  while (line[n-1]!='\n' && !Yfeof(file)) {
    if (maxChars>=MAX_LINE) goto abort;
    prev= line;
    getsLine->line= line= StrAlloc(maxChars+INC_LINE);
    strcpy(line, prev);
    StrFree(prev);
    getsLine->max= (maxChars+= INC_LINE);
    line[maxChars]= '\0';   /* just in case... */

    /* EOF is possible, in which case Yfgets returns 0 (ignored here)
       and leaves line unmodified.  The following strlen is guaranteed
       to return 0, and the loop terminates on the Yfeof test above.  */
    Yfgets(&line[n], maxChars+1-n, file);
    if (Yferror(file)) goto abort;
    n+= strlen(&line[n]);   /* faster than n= strlen(line) */
  }

  if (line[n-1]=='\n') line[--n]= '\0';
  getsLine->n= n;
  return line;

 abort:
  /* If neither Yferror(file) nor Yfeof(file), then line-too-long abort.  */
  if (maxChars>MIN_LINE) {
    StrFree(line);
    getsLine->line= line= StrAlloc(MIN_LINE);
    getsLine->max= maxChars= MIN_LINE;
  }
  line[0]= '\0';
  getsLine->n= 0;
  return 0;
}

/*--------------------------------------------------------------------------*/

/* Scan for C-style escape sequences in quoted strings (e.g.- \n, \t),
   returning the (single character) value of the escape sequence, and,
   if the 2nd parameter is non-0, the character which stopped the scan.
   Thus, if s=="tXYZ", then YpEscapeSeq returns 9 (ASCII tab), and
   endp=="XYZ"; the same results would obtain if s=="009XYZ".  */
int YpEscapeSeq(const char *s, char **endp)
{
  unsigned char c= *s++;
  int val;

  /* 1, 2, or 3 octal digits */
  if (c<='7' && c>='0') {
    int i= 2;
    val= c-'0';
    while ((c=*s)<='7' && c>='0' && i--) {
      val<<= 3;
      val|= c-'0';
      s++;
    }

  /* any number of hex digits (according to appendix A2.5.2 2nd ed K+R) */
  } else if (c=='x') {
    int isD, isU= 0;
    val= 0;
    while ((isD= ((c= *s)<='9' && c>='0')) ||
	   (isU= (c<='F' && c>='A')) ||
	   (c<='f' && c>='a')) {
      val<<= 4;
      if (isD) val|= c-'0';
      else if (isU) val|= c-('A'-10);
      else val|= c-('a'-10);
      s++;
    }

  /* symbolic escapes in rough order of frequency I use them */
  } else if (c=='n') val= '\n';
  else if (c=='t') val= '\t';
  else if (c=='a') val= '\a';
  else if (c=='f') val= '\f';
  else if (c=='r') val= '\r';
  else if (c=='v') val= '\v';
  else if (c=='b') val= '\b';

  /* Note that \ ? ' and " are just self-insertion like anything else.  */
  else val= c;

  if (endp) *endp= (char *)s;  /* sigh */
  return val;
}

/*--------------------------------------------------------------------------*/

/* The context argument to YpNextLine determines how that routine will
   prompt for input, if input is from a terminal.
   NL_MAIN      -- read first line for parse
   NL_NOINPUT   -- no non-comment input yet,
                     read next line (if file) or return EOF (if terminal)
   NL_CONTINUE  -- need more input to complete program unit (cont>)
   NL_QUOTE     -- inside multi-line quoted string (quot>)
   NL_COMMENT   -- inside multi-line comment (comm>)
 */
extern char *YpNextLine(int context);
#define NL_MAIN 0
#define NL_NOINPUT 1
#define NL_CONTINUE 2
#define NL_QUOTE 3
#define NL_COMMENT 4

/* YpNextLine will use YaltNextLine instead of its default algorithm,
   if non-0.  YaltNextLine will be zeroed if it ever returns 0 (the
   EOF signal).  It is also zeroed by ClearIncludes().  */
extern char *(*YaltNextLine)(int context);

/*--------------------------------------------------------------------------*/

extern UnaryOp PrintC, PrintS, PrintI, PrintL, PrintF, PrintD, PrintZ,
  PrintQ, PrintP, PrintSI, PrintR, PrintVD, PrintSD, PrintFN, PrintBI,
  PrintIO;

extern UnaryOp PrintXFN, PrintXBI, PrintX;

int printLength= 79;   /* maximum number of characters to put on a line */
long maxPrintLines= 5000;

static char nBuffer[80];   /* buffer to hold numbers from sprintf */

static int (*RawPrinter)(const char *s);
extern int PutsAsArray(const char *s);

static void (*PrintRaw)(Operand *at);
static void PrintRawC(Operand *at);
static void PrintRawS(Operand *at);
static void PrintRawI(Operand *at);
static void PrintRawL(Operand *at);
static void PrintRawF(Operand *at);
static void PrintRawD(Operand *at);
static void PrintRawZ(Operand *at);
static void PrintRawQ(Operand *at);
static void PrintRawP(Operand *at);
static void PrintRawSI(Operand *at);

static void PrintArray(Operand *at);

static char *GetTempBuffer(long len);
static void ClearTempBuffer(int force);

static void PrintDims(Dimension *dims);
static int PDRecurse(Dimension *dims, long *length, int last);

/* Print calls functions with no arguments, or prints anything else using
   YputsOut.  */
void Print(void)
{
  Operand op;
  sp->ops->FormOperand(sp, &op);
  if (op.ops==&builtinOps) {
    /* put operand into bogus form expected by Eval (see Eval in ops3.c) */
    op.references= 0;   /* intentionally misused */
    EvalBI(&op);
  } else if (op.ops==&functionOps) {
    /* put operand into bogus form expected by Eval (see Eval in ops3.c) */
    op.references= 0;   /* intentionally misused */
    EvalFN(&op);
  } else {
    PrintInit(YputsOut);
    op.ops->Print(&op);
    /* Drop(1);
       Print will be followed by DropTop so that CalledAsSubroutine always
       works.  See parse.c.  */
    ForceNewline();
  }
}

/* Y_print is a built in function which prints each of its arguments
   in turn in the manner of Print if called as a function, or returns a
   string vector if called as a function.  */
void Y_print(int nArgs)
{
  Operand op;
  Symbol *stack= sp-nArgs+1;
  if (CalledAsSubroutine()) {
    PrintInit(YputsOut);
    PushDataBlock(Ref(&nilDB));
  } else {
    PrintInit(&PutsAsArray);
    PushDataBlock(NewArray(&stringStruct, (Dimension *)0));
  }
  while (nArgs--) {
    stack->ops->FormOperand(stack, &op);
    if (op.ops==&functionOps) PrintXFN(&op);
    else if (op.ops==&builtinOps) PrintXBI(&op);
    else op.ops->Print(&op);
    if (nArgs) PermitNewline(2);
    stack++;
  }
  ForceNewline();
}

/* PutsAsArray appends string to string array on top of stack --
   intended as a plug-in replacement for YputsOut */
int PutsAsArray(const char *s)
{
  Array *array= (Array *)sp->value.db;
  Dimension *dims= array->type.dims;
  long number;
  if (dims) {
    number= dims->number;
    sp->value.db= (DataBlock *)GrowArray(array, 1L);
    Unref(array);
    array= (Array *)sp->value.db;
  } else {
    array->type.dims= NewDimension(1L, 1L, (Dimension *)0);
    number= 0;
  }
  array->value.q[number]= StrCpy(s);
  return 0;
}

static char *printBuf= 0;
static int lenPrintBuf= 0;
static int printNow, permitNow;
static long printLines;

void PrintInit(int (*puts)(const char *))
{
  RawPrinter= puts;
  if (lenPrintBuf<printLength || (printLength<=79 && lenPrintBuf>79)) {
    char *p= printBuf;
    printBuf= 0;
    StrFree(p);
    if (printLength<39) printLength= 39;
    else if (printLength>256) printLength= 256;
    printBuf= StrAlloc(printLength+1);  /* allow for newline */
    lenPrintBuf= printLength;
  }
  printNow= permitNow= 0;
  printLines= 0;
  printBuf[0]= '\0';
}

void PrintFunc(const char *s)
{
#ifdef FAKE_INTERRUPTS
  extern int check_except(void);
  extern short check_brk_flag;
#endif
  long len= strlen(s);
  while (printNow+len > printLength) {
#ifdef FAKE_INTERRUPTS
    if (check_brk_flag) check_except();
#endif
    if (permitNow) {
      char savec[2];
      int i= permitNow, j= 1;
      savec[0]= printBuf[i];
      printBuf[i++]= '\0';
      if (printLines++ < maxPrintLines) RawPrinter(printBuf);
      printBuf[0]= savec[0];
      while (i<=printNow) printBuf[j++]= printBuf[i++];
      printNow-= permitNow;
      permitNow= 0;
    } else {
      long nhere= printLength-printNow-1;
      char movec;
      if (nhere>0) {
	strncpy(&printBuf[printNow], s, nhere);
	s+= nhere;
	len-= nhere;
      } else if (nhere<0) {  /* only -1 is possible */
	movec= printBuf[printLength-1];
      }
      strcpy(&printBuf[printLength-1], "\\");
      if (printLines++ < maxPrintLines) RawPrinter(printBuf);
      if (nhere >= 0) {
	printNow= 0;
	printBuf[0]= '\0';
      } else {
	printNow= 1;
	printBuf[0]= movec;
	printBuf[1]= '\0';
      }
    }
  }
  strcpy(&printBuf[printNow], s);
  printNow+= len;
}

void PermitNewline(int nSpaces)
{
  if (printNow+nSpaces > printLength) ForceNewline();
  else while (nSpaces--) printBuf[printNow++]= ' ';
  printBuf[printNow]= '\0';
  permitNow= printNow;
}

void ForceNewline(void)
{
#ifdef FAKE_INTERRUPTS
  extern int check_except(void);
  extern short check_brk_flag;
#endif
  if (printNow) {
#ifdef FAKE_INTERRUPTS
    if (check_brk_flag) check_except();
#endif
    if (printLines++ < maxPrintLines) RawPrinter(printBuf);
    printNow= permitNow= 0;
    printBuf[0]= '\0';
  }
}

void PrintFN(Operand *op)
{
  /* put operand into bogus form expected by Eval (see Eval in ops3.c) */
  op->references= 0;   /* intentionally misused */
  EvalFN(op);
}

void PrintBI(Operand *op)
{
  /* put operand into bogus form expected by Eval (see Eval in ops3.c) */
  op->references= 0;   /* intentionally misused */
  EvalBI(op);
}

void PrintXFN(Operand *op)
{
  Function *f= op->value;
  Instruction *pc= f->code;
  long posList;
  int n;

  PrintFunc("func ");
  if (pc->index < 0) PrintFunc("<nameless>");
  else PrintFunc(globalTable.names[pc->index]);
  pc++;

  PrintFunc("(");
  PermitNewline(0);
  n= f->nPos;
  posList= f->hasPosList;
  while (n--) {
    posList>>= 1;
    if (posList&1) PrintFunc("&");
    PrintFunc(globalTable.names[(pc++)->index]);
    if (n || (f->hasPosList&1) || f->nKey)
      { PrintFunc(","); PermitNewline(0); }
  }
  n= f->nKey;
  if (f->hasPosList&1) {
    pc++;   /* skip *va* parameter */
    PrintFunc("..");
    if (n) { PrintFunc(","); PermitNewline(0); }
  }
  while (n--) {
    PrintFunc(globalTable.names[(pc++)->index]);
    if (n) { PrintFunc("=,"); PermitNewline(0); }
    else PrintFunc("=");
  }
  PrintFunc(")");
}

void PrintXBI(Operand *op)
{
  BIFunction *bif= op->value;
  char *name;
  long len;
  name= bif->index>=0? globalTable.names[bif->index] : "<nameless>";
  len= strlen(name);
  strcpy(nBuffer, "builtin ");
  strncat(nBuffer+8, name, 64);
  if (len>64) strcpy(nBuffer+72, "...");
  strcat(nBuffer, "()");
  PrintFunc(nBuffer);
}

void PrintX(Operand *op)
{
  DataBlock *db= op->value;
  char *name= db? db->ops->typeName : "<unknown>";
  long len;
  len= strlen(name);
  strcpy(nBuffer, "Object of type: ");
  strncat(nBuffer+16, name, 64);
  if (len>56) strcpy(nBuffer+72, "...");
  PrintFunc(nBuffer);
}

static void PrintArray(Operand *at)
{
  Dimension *dims= at->type.dims;
  if (!dims) {
    PrintRaw(at);
  } else {
    void (*OrigPrintRaw)(Operand *)= PrintRaw;
    long n= dims->number;
    at->type.dims= dims->next;
    PrintFunc("[");
    for (;;) {
      PrintArray(at);
      PrintRaw= OrigPrintRaw;  /* PrintRawSI changes this */
      if (!(--n)) break;
      PrintFunc(",");
      PermitNewline(0);
    }
    PrintFunc("]");
    at->type.dims= dims;
  }
}

void PrintC(Operand *op) { PrintRaw= PrintRawC; PrintArray(op); }
void PrintS(Operand *op) { PrintRaw= PrintRawS; PrintArray(op); }
void PrintI(Operand *op) { PrintRaw= PrintRawI; PrintArray(op); }
void PrintL(Operand *op) { PrintRaw= PrintRawL; PrintArray(op); }
void PrintF(Operand *op) { PrintRaw= PrintRawF; PrintArray(op); }
void PrintD(Operand *op) { PrintRaw= PrintRawD; PrintArray(op); }
void PrintZ(Operand *op) { PrintRaw= PrintRawZ; PrintArray(op); }
void PrintQ(Operand *op) { PrintRaw= PrintRawQ; PrintArray(op); }
void PrintP(Operand *op) { PrintRaw= PrintRawP; PrintArray(op); }
void PrintSI(Operand *op) { PrintRaw= PrintRawSI; PrintArray(op); }

#define DEFAULT_CHAR "0x%02x"
#define DEFAULT_SHORT "%d"
#define DEFAULT_INT "%d"
#define DEFAULT_LONG "%ld"
#define DEFAULT_FLOAT "%g"
#define DEFAULT_DOUBLE "%g"
#define DEFAULT_COMPLEX "%g%+gi"
#define DEFAULT_POINTER "%p"

static char *typeDefault[8]= {
  DEFAULT_CHAR, DEFAULT_SHORT, DEFAULT_INT, DEFAULT_LONG,
  DEFAULT_FLOAT, DEFAULT_DOUBLE, DEFAULT_COMPLEX, DEFAULT_POINTER };

void DefaultPrintFormat(int type)
{
  if (type & (1<<T_CHAR)) yCharFormat= typeDefault[0];
  if (type & (1<<T_SHORT)) yShortFormat= typeDefault[1];
  if (type & (1<<T_INT)) yIntFormat= typeDefault[2];
  if (type & (1<<T_LONG)) yLongFormat= typeDefault[3];
  if (type & (1<<T_FLOAT)) yFloatFormat= typeDefault[4];
  if (type & (1<<T_DOUBLE)) yDoubleFormat= typeDefault[5];
  if (type & (1<<T_COMPLEX)) yComplexFormat= typeDefault[6];
  if (type & (1<<T_POINTER)) yPointerFormat= typeDefault[7];
}

char *yCharFormat= DEFAULT_CHAR;
static void PrintRawC(Operand *at)
{ unsigned char *pv= at->value; sprintf(nBuffer, yCharFormat, (int)*pv);
  PrintFunc(nBuffer); at->value= pv+1; }

char *yShortFormat= DEFAULT_SHORT;
static void PrintRawS(Operand *at)
{ short *pv= at->value; sprintf(nBuffer, yShortFormat, (int)*pv);
  PrintFunc(nBuffer); at->value= pv+1; }

char *yIntFormat= DEFAULT_INT;
static void PrintRawI(Operand *at)
{ int *pv= at->value; sprintf(nBuffer, yIntFormat, *pv);
  PrintFunc(nBuffer); at->value= pv+1; }

char *yLongFormat= DEFAULT_LONG;
static void PrintRawL(Operand *at)
{ long *pv= at->value; sprintf(nBuffer, yLongFormat, *pv);
  PrintFunc(nBuffer); at->value= pv+1; }

char *yFloatFormat= DEFAULT_FLOAT;
static void PrintRawF(Operand *at)
{ float *pv= at->value; sprintf(nBuffer, yFloatFormat, (double)*pv);
  PrintFunc(nBuffer); at->value= pv+1; }

char *yDoubleFormat= DEFAULT_DOUBLE;
static void PrintRawD(Operand *at)
{ double *pv= at->value; sprintf(nBuffer, yDoubleFormat, *pv);
  PrintFunc(nBuffer); at->value= pv+1; }

char *yComplexFormat= DEFAULT_COMPLEX;
static void PrintRawZ(Operand *at)
{ double *pv= at->value; sprintf(nBuffer, yComplexFormat, pv[0], pv[1]);
  PrintFunc(nBuffer); at->value= pv+2; }

char *yPointerFormat= DEFAULT_POINTER;
static void PrintRawP(Operand *at)
{ void **pv= at->value; sprintf(nBuffer, yPointerFormat, *pv);
  PrintFunc(nBuffer); at->value= pv+1; }

static long typeIndex[8]= { -1, -1, -1, -1, -1, -1, -1, -1 };
static char **typeFormat[8]= {
  &yCharFormat, &yShortFormat, &yIntFormat, &yLongFormat,
  &yFloatFormat, &yDoubleFormat, &yComplexFormat, &yPointerFormat };

void Y_print_format(int nArgs)
{
  Symbol *arg= sp-nArgs+1;

  if (typeIndex[0]<0) {
    typeIndex[0]= Globalize("char", 0L);
    typeIndex[1]= Globalize("short", 0L);
    typeIndex[2]= Globalize("int", 0L);
    typeIndex[3]= Globalize("long", 0L);
    typeIndex[4]= Globalize("float", 0L);
    typeIndex[5]= Globalize("double", 0L);
    typeIndex[6]= Globalize("complex", 0L);
    typeIndex[7]= Globalize("pointer", 0L);
  }

  if (nArgs < 1) {
    DefaultPrintFormat(~0);
    printLength= 79;
    maxPrintLines= 5000;
  } else do {
    if (arg->ops) {
      long i= YGetInteger(arg++);
      if (i>256) printLength= 256;
      else if (i>39) printLength= i;
      else if (i>0) printLength= 39;
      else printLength= 79;
    } else {
      long index= (arg++)->index;
      int i;
      char *string;
      for (i=0 ; i<8 ; i++) if (typeIndex[i]==index) break;
      if (i>=8) YError("unrecognized keyword in print_format");
      string= *typeFormat[i];
      *typeFormat[i]= typeDefault[i];
      if (string!=typeDefault[i]) StrFree(string);
      string= YGetString(arg++);
      nArgs--;
      if (string && strlen(string)) *typeFormat[i]= StrCpy(string);
    }
  } while (--nArgs);
}

static char *sPart= 0;
static long sPartLen= 0;

static char *GetTempBuffer(long len)
{
  if (len>=sPartLen) {
    long newlen= ((len-1)/80 + 1)*80;
    ClearTempBuffer(1);
    sPart= StrAlloc(newlen);
    sPartLen= newlen;
  }
  return sPart;
}

static void ClearTempBuffer(int force)
{
  if (force || sPartLen>80) {
    char *part= sPart;
    sPartLen= 0;
    sPart= 0;
    StrFree(part);
  }
}

char *ScanForEscape(char *s)
{
  char c;
  if (!s) return 0;
  while ((c= *s) && c>=' ' && c<'\177' && c!='\\' && c!='\"') s++;
  return s;
}

int AddEscapeSeq(char *s, int esc)
{
  int n= 2;
  if (esc=='\\') strcpy(s, "\\\\");
  else if (esc=='\"') strcpy(s, "\\\"");
  else if (esc=='\n') strcpy(s, "\\n");
  else if (esc=='\t') strcpy(s, "\\t");
  else if (esc=='\a') strcpy(s, "\\a");
  else if (esc=='\f') strcpy(s, "\\f");
  else if (esc=='\r') strcpy(s, "\\r");
  else if (esc=='\v') strcpy(s, "\\v");
  else if (esc=='\b') strcpy(s, "\\b");
  else { sprintf(s, "\\%03o", esc&0xff); n= 4; }
  return n;
}

static void PrintRawQ(Operand *at)
{
  char **pv= at->value;
  char *s= *pv++;
  char *esc;
  if (!s) {
    PrintRawP(at);
  } else {
    PrintFunc("\"");
    if (*(esc= ScanForEscape(s))) {
      char *part;
      do {
	part= GetTempBuffer(esc-s + 4);
	strncpy(part, s, esc-s);
	AddEscapeSeq(part + (esc-s), (int)(*esc));
	PrintFunc(part);
	s= esc+1;
      } while (*(esc= ScanForEscape(s)));
      ClearTempBuffer(0);
    }
    if (*s) PrintFunc(s);
    PrintFunc("\"");
  }
  at->value= pv;
}

static void PrintRawSI(Operand *at)
{
  char *pv= at->value;
  StructDef *base= at->type.base;
  Operand subOp;
  long n= base->table.nItems;
  char **name= base->table.names;
  Member *member= base->members;
  long *offset= base->offsets;

  if (base->file) YError("(BUG?) can't print an instance of a disk struct");

  PrintFunc(StructName(base));
  PrintFunc("(");
  PermitNewline(0);
  for (;;) {
    PrintFunc(*name);
    PrintFunc("=");
    PermitNewline(0);
    subOp.type.base= member->base;
    subOp.type.dims= member->dims;
    subOp.value= pv + (*offset);
    subOp.type.base->dataOps->Print(&subOp);
    if (!(--n)) break;
    PrintFunc(",");
    PermitNewline(0);
    name++;
    member++;
    offset++;
  }
  PrintFunc(")");

  at->value= pv + base->size;
}

/* range functions */
extern RangeFunc RFmin, RFmax, RFptp, RFsum, RFavg, RFrms, RFmnx, RFmxx,
  RFpsum, RFdif, RFzcen, RFpcen, RFuncp, RFcum;

static char *rfNames[]= { "avg:","cum:","dif:","max:","min:","mnx:","mxx:",
                "pcen:","psum:","ptp:","rms:","sum:","uncp:","zcen:","??:" };

static RangeFunc *RFs[]= { &RFavg,&RFcum,&RFdif,&RFmax,&RFmin,&RFmnx,&RFmxx,
	            &RFpcen,&RFpsum,&RFptp,&RFrms,&RFsum,&RFuncp,&RFzcen,0 };

char *GetRFName(RangeFunc *rfTarget)
{
  RangeFunc **rf= RFs;
  while (*rf && *rf!=rfTarget) rf++;
  return rfNames[rf-RFs];
}

void PrintR(Operand *op)
{
  Range *range= op->value;
  int flags= range->nilFlags;
  long len;
  if (range->rf) {
    strcpy(nBuffer, GetRFName(range->rf));
    len= strlen(nBuffer);
  } else if (flags&R_MARKED) {
    strcpy(nBuffer, "+:");
    len= 2;
  } else if (flags&R_PSEUDO) {
    strcpy(nBuffer, "-:");
    len= 2;
  } else if (flags&R_RUBBER) {
    PrintFunc("<..>:");
    return;
  } else if (flags&R_NULLER) {
    PrintFunc("<nuller>:");
    return;
  } else {
    nBuffer[0]= '\0';
    len= 0;
  }
  if (flags&R_MINNIL) {
    if (flags&R_MAXNIL) {
      strcpy(nBuffer+len, ":");
    } else {
      sprintf(nBuffer+len, ":%ld", range->max);
    }
  } else if (flags&R_MAXNIL) {
    sprintf(nBuffer+len, "%ld:", range->min);
  } else {
    sprintf(nBuffer+len, "%ld:%ld", range->min, range->max);
  }
  if (range->inc!=1) {
    len= strlen(nBuffer);
    sprintf(nBuffer+len, ":%ld", range->inc);
  }
  PrintFunc(nBuffer);
}

/* ARGSUSED */
void PrintVD(Operand *op)
{
  PrintFunc("[]");
}

static int PDRecurse(Dimension *dims, long *length, int last)
{
  long len;
  int count;

  if (!dims) return 0;
  count= PDRecurse(dims->next, length, 0);
  if (count<0) return count-1;
  len= *length;

  if (dims->origin!=1L) {
    if (len>45) return -1;
    sprintf(nBuffer+len, "%ld:%ld",
	    dims->origin, dims->origin+dims->number-1);
  } else {
    if (len>60) return -1;
    sprintf(nBuffer+len, "%ld", dims->number);
  }
  len+= strlen(nBuffer+len);
  if (!last) { strcpy(nBuffer+len, ","); len++; }

  *length= len;
  return count+1;
}

static void PrintDims(Dimension *dims)
{
  if (dims) {
    long len= 1;
    strcpy(nBuffer, "(");
    if (PDRecurse(dims, &len, 1)<0) {
      strcpy(nBuffer+len, "...");
      len+= 3;
    }
    strcpy(nBuffer+len, ")");
    PrintFunc(nBuffer);
  }
}

void PrintSD(Operand *at)
{
  StructDef *base= at->value;
  long n= base->table.nItems;
  Member *member= base->members;
  char **name= base->table.names;

  ForceNewline();
  PrintFunc("struct ");
  PrintFunc(StructName(base));
  PrintFunc(" {");
  ForceNewline();
  while (n--) {
    PrintFunc("  ");
    PrintFunc(StructName(member->base));
    PrintFunc(" ");
    PrintFunc(*name);
    PrintDims(member->dims);
    PrintFunc(";");
    ForceNewline();
    member++;
    name++;
  }
  PrintFunc("}");
  ForceNewline();
}

/*--------------------------------------------------------------------------*/

static char *printText= 0, *tmpText= 0;
static char *ioStatus[]=
  { "<illegal>", "read-only", "write-only", "read-write" };

static void SafeFree(char **s);
static void SafeFree(char **s)
{
  char *t= *s;
  *s= 0;
  StrFree(t);
}

void PrintIO(Operand *op)
{
  IOStream *file= op->value;
  char text[80];
  SafeFree(&printText);
  SafeFree(&tmpText);

  /* read-write binary stream: <tail of fullname>
       In directory: <head of fullname>
       Current record is number 53 of 53
       File of current record: <tail of child's name>
       Time, cycle of current record: 1.234567e+00, 9876
   */

  ForceNewline();
  if (file->stream) {
    sprintf(text, "%s binary stream: ", ioStatus[file->permissions&3]);
    tmpText= YNameTail(file->fullname);
  } else {
    strcpy(text, "binary stream <closed>: ");
  }
  printText= StrCat(text, tmpText);
  SafeFree(&tmpText);
  PrintFunc(printText);
  SafeFree(&printText);
  ForceNewline();

  tmpText= YNameHead(file->fullname);
  printText= StrCat("  In directory: ", tmpText);
  SafeFree(&tmpText);
  PrintFunc(printText);
  SafeFree(&printText);
  ForceNewline();

  if (file->history) {
    HistoryInfo *history= file->history;

    if (history->recNumber>=0) {
      long i= history->recNumber;

      sprintf(text, "  Current record is number %ld of %ld",
	      i+1, history->nRecords);
      PrintFunc(text);
      ForceNewline();

      tmpText= YNameTail(history->child->fullname);
      printText= StrCat("  File of current record: ", tmpText);
      SafeFree(&tmpText);
      PrintFunc(printText);
      SafeFree(&printText);
      ForceNewline();

      if (history->time) {
	if (history->ncyc) {
	  sprintf(text, "  Time, cycle of current record: %.6e, %ld",
		  history->time[i], history->ncyc[i]);
	} else {
	  sprintf(text, "  Time of current record: %.6e",
		  history->time[i]);
	}
      } else {
	if (history->ncyc) {
	  sprintf(text, "  Cycle of current record: %ld",
		  history->ncyc[i]);
	} else {
	  strcpy(text, "  <No time or cycle available>");
	}
      }
      PrintFunc(text);
      ForceNewline();

    } else {
      PrintFunc("  <No current record>");
      ForceNewline();
    }
  }
}

/*--------------------------------------------------------------------------*/

/* Set up a block allocator which grabs space for 16 IOFileLink objects
   at a time.  Since IOFileLink contains several pointers, the alignment
   of an IOFileLink must be at least as strict as a void*.  */
static MemoryBlock ioflBlock= {0, 0, sizeof(IOFileLink),
				  16*sizeof(IOFileLink)};

void AddIOLink(IOFileLink** list, void *ios)
{
  IOFileLink *first= *list;
  IOFileLink *iofl= NextUnit(&ioflBlock);
  iofl->next= first;
  iofl->prev= list;
  iofl->ios= ios;
  *list= iofl;
  if (first) first->prev= &iofl->next;
}

void RemoveIOLink(IOFileLink* iofl, void *ios)
{
  for ( ; iofl ; iofl=iofl->next) if (iofl->ios==ios) break;
  if (iofl) {
    *iofl->prev= iofl->next;
    if (iofl->next) iofl->next->prev= iofl->prev;
    FreeUnit(&ioflBlock, iofl);
  }
}

/*--------------------------------------------------------------------------*/

char *YpReparse(void *function)
{
  Function *func= function;
  long index= func? func->code[0].index : -1;
  long position= ReopenSource(index, 1);
  char *msg;
  if (position>=0) {
    YpParse(func);  /* This had better not generate any new tasks... */
    msg= MakeErrorLine(ypBeginLine,
		       nYpIncludes? ypIncludes[nYpIncludes-1].filename : 0);
    if (nYpIncludes && ypIncludes[nYpIncludes-1].file) {
      fclose(ypIncludes[nYpIncludes-1].file);
      ypIncludes[nYpIncludes-1].file= 0;
    }
  } else if (position<-3) {
    msg= MakeErrorLine(-4,
		 "*****fseek failed scanning source file for function");
  } else if (position<-2) {
    msg= MakeErrorLine(-3,
		 "*****source file changed, no longer contains function");
  } else if (position<-1) {
    msg= MakeErrorLine(-2,
		 "*****source file for function no longer exists");
  } else {
    msg= MakeErrorLine(-1,
		 "*****source file for function unknown");
  }
  return msg;
}

/*--------------------------------------------------------------------------*/