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/*
* SHTTY.C - routines to handle low level terminal I/O
*
* Source Version: 4.0
* Software Release #92-0043
*
*/
#include "cpyright.h"
#include "scheme.h"
#define PRIMITIVE_PRINT (*pr_print)
#define PRIMITIVE_GETLN (*pr_gets)
#define EOI(str) \
(((SS_PTR(str) != SS_BUFFER(str)) && (*(SS_PTR(str) - 1) == '\n')) || \
(*SS_PTR(str) == '\0'))
static PFfprintf
pr_print = NULL;
static PFfgets
pr_gets = NULL;
char
Sbuffer[LRG_TXT_BUFFER];
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_GET_CH - the do it right character reader
* - must get the next character from the given stream
*/
int SS_get_ch(str, ign_ws)
object *str;
int ign_ws;
{Register int c;
Register FILE *s;
char eof;
eof = (char) EOF;
if (pr_gets == NULL)
#ifdef MAC
pr_gets = (PFfgets) PG_wind_fgets;
#else
pr_gets = io_gets_hook;
#endif
s = SS_INSTREAM(str);
while (TRUE)
{if (EOI(str))
{if (s == NULL)
return(EOF);
if (PRIMITIVE_GETLN(SS_BUFFER(str), MAXLINE, s) == NULL)
{*SS_PTR(str) = eof;
return(EOF);};
SS_PTR(str) = SS_BUFFER(str);};
c = *SS_PTR(str)++;
if (c == EOF)
SS_PTR(str)--;
if (ign_ws)
{switch (c)
{case '\n':
#ifndef MACPLUS
case '\r':
#endif
case '\t':
case ' ' : break;
case ';' : while ((c = *SS_PTR(str)++) != '\0')
{if (c == EOF)
return(c);
else if ((c == '\n') || (c == '\r'))
break;};
break;
default : return(c);};}
else
return(c);};}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_UNGET_CH - the do it right character unreader
* - must put the character back on the stream
*/
void SS_unget_ch(c, str)
int c;
object *str;
{if (SS_PTR(str) > SS_BUFFER(str))
*(--SS_PTR(str)) = (char) c;
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_PUT_CH - the do it right character printer
* - must put the character to the given stream
*/
void SS_put_ch(c, str)
int c;
object *str;
{FILE *s;
s = SS_INSTREAM(str);
if (s != NULL)
putc(c, s);
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_PRINTF - a print function that can handle transcripts */
#ifdef PCC
int SS_printf(fp, fmt, va_alist)
FILE *fp;
char *fmt;
va_dcl
#endif
#ifdef ANSI
int SS_printf(FILE *fp, char *fmt, ...)
#endif
{FILE *hp;
if (fp != NULL)
{SC_VA_START(fmt);
SC_VSPRINTF(Sbuffer, fmt);
SC_VA_END;
if (pr_print == NULL)
#ifdef MAC
pr_print = (PFfprintf) PG_wind_fprintf;
#else
pr_print = io_printf_hook;
#endif
hp = SS_OUTSTREAM(SS_histdev);
if (SS_hist_flag && (fp != hp))
PRIMITIVE_PRINT(hp, "%s", Sbuffer);
PRIMITIVE_PRINT(fp, "%s", Sbuffer);};
return(FALSE);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_GET_STRING - convert a SCHEME object to a string */
char *SS_get_string(obj)
object *obj;
{static char t[MAXLINE];
memset(t, 0, MAXLINE);
if (obj->print_name != NULL)
strcpy(t, obj->print_name);
else if (SS_integerp(obj))
sprintf(t, "%ld", SS_INTEGER_VALUE(obj));
else if (SS_floatp(obj))
sprintf(t, "%g", SS_FLOAT_VALUE(obj));
else if (SS_nullobjp(obj))
strcpy(t, "nil");
else if (obj == NULL)
strcpy(t, "nil");
else
strcpy(t, "-none-");
return(t);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
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