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/* xlio - xlisp i/o routines */
/* Copyright (c) 1985, by David Michael Betz
All Rights Reserved
Permission is granted for unrestricted non-commercial use */
/* CHANGE LOG
* --------------------------------------------------------------------
* 28Apr03 dm eliminate some compiler warnings
*/
#include "xlisp.h"
/* external variables */
extern LVAL s_stdin,s_stdout,s_stderr,s_debugio,s_traceout,s_unbound;
extern int xlfsize;
#ifdef DEBUG_INPUT
extern FILE *read_by_xlisp;
#endif
/* xlgetc - get a character from a file or stream */
int xlgetc(LVAL fptr)
{
LVAL lptr, cptr=NULL;
FILE *fp;
int ch;
/* check for input from nil */
if (fptr == NIL)
ch = EOF;
/* otherwise, check for input from a stream */
else if (ustreamp(fptr)) {
if ((lptr = gethead(fptr)) == NIL)
ch = EOF;
else {
if (!consp(lptr) || (cptr = car(lptr)) == NIL || !charp(cptr))
xlfail("bad stream");
sethead(fptr,lptr = cdr(lptr));
if (lptr == NIL)
settail(fptr,NIL);
ch = getchcode(cptr);
}
}
/* otherwise, check for a buffered character */
else if ((ch = getsavech(fptr)))
setsavech(fptr,'\0');
/* otherwise, check for terminal input or file input */
else {
fp = getfile(fptr);
if (fp == stdin || fp == STDERR)
ch = ostgetc();
else
ch = osagetc(fp);
#ifdef DEBUG_INPUT
if (read_by_xlisp && ch != -1) {
putc(ch, read_by_xlisp);
}
#endif
}
/* return the character */
return (ch);
}
/* xlungetc - unget a character */
void xlungetc(LVAL fptr, int ch)
{
LVAL lptr;
/* check for ungetc from nil */
if (fptr == NIL || ch == EOF)
;
/* otherwise, check for ungetc to a stream */
else if (ustreamp(fptr)) {
if (ch != EOF) {
lptr = cons(cvchar(ch),gethead(fptr));
if (gethead(fptr) == NIL)
settail(fptr,lptr);
sethead(fptr,lptr);
}
}
/* otherwise, it must be a file */
else
setsavech(fptr,ch);
}
/* xlpeek - peek at a character from a file or stream */
int xlpeek(LVAL fptr)
{
LVAL lptr, cptr=NULL;
int ch;
/* check for input from nil */
if (fptr == NIL)
ch = EOF;
/* otherwise, check for input from a stream */
else if (ustreamp(fptr)) {
if ((lptr = gethead(fptr)) == NIL)
ch = EOF;
else {
if (!consp(lptr) || (cptr = car(lptr)) == NIL || !charp(cptr))
xlfail("bad stream");
ch = getchcode(cptr);
}
}
/* otherwise, get the next file character and save it */
else {
ch = xlgetc(fptr);
setsavech(fptr,ch);
}
/* return the character */
return (ch);
}
/* xlputc - put a character to a file or stream */
void xlputc(LVAL fptr, int ch)
{
LVAL lptr;
FILE *fp;
/* count the character */
++xlfsize;
/* check for output to nil */
if (fptr == NIL)
;
/* otherwise, check for output to an unnamed stream */
else if (ustreamp(fptr)) {
lptr = consa(cvchar(ch));
if (gettail(fptr))
rplacd(gettail(fptr),lptr);
else
sethead(fptr,lptr);
settail(fptr,lptr);
}
/* otherwise, check for terminal output or file output */
else {
fp = getfile(fptr);
if (!fp)
xlfail("file not open");
else if (fp == stdout || fp == STDERR)
ostputc(ch);
else
osaputc(ch,fp);
}
}
/* xloutflush -- flush output buffer */
void xloutflush(LVAL fptr)
{
FILE *fp;
/* check for output to nil or unnamed stream */
if (fptr == NIL || ustreamp(fptr))
;
/* otherwise, check for terminal output or file output */
else {
fp = getfile(fptr);
if (!fp)
xlfail("file not open");
else if (fp == stdout || fp == STDERR)
ostoutflush();
else
osoutflush(fp);
}
}
/* xlflush - flush the input buffer */
void xlflush(void)
{
osflush();
}
/* stdprint - print to *standard-output* */
void stdprint(LVAL expr)
{
xlprint(getvalue(s_stdout),expr,TRUE);
xlterpri(getvalue(s_stdout));
}
/* stdputstr - print a string to *standard-output* */
void stdputstr(const char *str)
{
xlputstr(getvalue(s_stdout),str);
}
/* stdflush - flush the *standard-output* buffer */
void stdflush()
{
xloutflush(getvalue(s_stdout));
}
/* errprint - print to *error-output* */
void errprint(LVAL expr)
{
xlprint(getvalue(s_stderr),expr,TRUE);
xlterpri(getvalue(s_stderr));
}
/* errputstr - print a string to *error-output* */
void errputstr(const const char *str)
{
xlputstr(getvalue(s_stderr),str);
}
/* dbgprint - print to *debug-io* */
void dbgprint(LVAL expr)
{
xlprint(getvalue(s_debugio),expr,TRUE);
xlterpri(getvalue(s_debugio));
}
/* dbgputstr - print a string to *debug-io* */
void dbgputstr(const char *str)
{
xlputstr(getvalue(s_debugio),str);
}
/* trcprin1 - print to *trace-output* */
void trcprin1(LVAL expr)
{
xlprint(getvalue(s_traceout),expr,TRUE);
}
/* trcputstr - print a string to *trace-output* */
void trcputstr(const char *str)
{
xlputstr(getvalue(s_traceout),str);
}
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