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OS/2 Shareware BBS: 10 Tools
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XSCHEME2.ZIP
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xsio.c
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C/C++ Source or Header
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1990-01-08
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2KB
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109 lines
/* xsio - xscheme i/o routines */
/* Copyright (c) 1988, by David Michael Betz
All Rights Reserved
Permission is granted for unrestricted non-commercial use */
#include "xscheme.h"
/* global variables */
FIXTYPE xlfsize;
/* external variables */
extern LVAL s_stdin,s_stdout,s_stderr,s_unbound;
/* xlgetc - get a character from a file or stream */
int xlgetc(fptr)
LVAL fptr;
{
FILE *fp;
int ch;
/* check for input from nil */
if (fptr == NIL)
ch = EOF;
/* 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 if ((getpflags(fptr) & PF_BINARY) != 0)
ch = osbgetc(fp);
else
ch = osagetc(fp);
}
/* return the character */
return (ch);
}
/* xlungetc - unget a character */
xlungetc(fptr,ch)
LVAL fptr; int ch;
{
/* check for ungetc from nil */
if (fptr == NIL)
;
/* otherwise, it must be a file */
else
setsavech(fptr,ch);
}
/* xlputc - put a character to a file or stream */
xlputc(fptr,ch)
LVAL fptr; int ch;
{
FILE *fp;
/* count the character */
++xlfsize;
/* check for output to nil */
if (fptr == NIL)
;
/* otherwise, check for terminal output or file output */
else {
fp = getfile(fptr);
if (fp == stdout || fp == stderr)
ostputc(ch);
else if ((getpflags(fptr) & PF_BINARY) != 0)
osbputc(ch,fp);
else
osaputc(ch,fp);
}
}
/* xlflush - flush the input buffer */
int xlflush()
{
osflush();
}
/* stdputstr - print a string to *standard-output* */
stdputstr(str)
char *str;
{
xlputstr(getvalue(s_stdout),str);
}
/* errprint - print to *error-output* */
errprint(expr)
LVAL expr;
{
xlprin1(expr,getvalue(s_stderr));
xlterpri(getvalue(s_stderr));
}
/* errputstr - print a string to *error-output* */
errputstr(str)
char *str;
{
xlputstr(getvalue(s_stderr),str);
}