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io.c
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/* LeeScheme/io.c - Copyright (C) Lee Richard Boynton, 1993-2000. */
#include "scheme.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
static object scratch_buffer;
#define PORT_IS_OPEN_P(p) (!(PORT_FLAGS(p) & PORT_FLAG_CLOSED))
/*
* Reading
*/
extern int edlin_getc(object ioport);
static void primop_port_edlin(long argc) {
object p = *sp++;
int b = 0;
TYPE_CHECK(INPUT_PORT_P(p)&OUTPUT_PORT_P(p),1,"I/O port",p);
b = (*sp++ != false_object);
if (PORT_IS_OPEN_P(p)) {
if (b)
PORT_FLAGS(p) = PORT_FLAGS(p) | PORT_FLAG_COOKED;
else
PORT_FLAGS(p) = PORT_FLAGS(p) & ~PORT_FLAG_COOKED;
}
*--sp = void_object;
}
static int get_character(object inport) {
int c = PORT_CHAR_BUF(inport);
if (c >= 0) {
PORT_CHAR_BUF(inport) = -1;
} else {
if (PORT_FLAGS(inport) & PORT_FLAG_COOKED)
c = edlin_getc(inport);
else
c = (*(PORT_GETC_PROC(inport)))(inport);
}
return c;
}
static void unget_character(int c,object port) {
PORT_CHAR_BUF(port) = c;
}
static object read_object(object port);
static object read_comment(object port) {
char c;
do {
c = get_character(port);
} while (c != '\n' && c != -1);
return (c == -1)? eof_object : true_object;
}
static object read_list(object port) {
object the_list, the_tail, temp, element;
char c;
long dot_state = 0;
the_list = null_object;
the_tail = null_object;
PUSH_GC_PROTECT(the_list);
PUSH_GC_PROTECT(the_tail);
while ((c = get_character(port)) != -1) {
if (WHITESPACE_P(c)) continue;
if (COMMENT_P(c)) {
if (EOF_P(read_comment(port))) {
the_list = eof_object;
break;
} else
continue;
}
if (c == ')') {
if (dot_state == 1)
error(unbound_object,
"read: expected element after dot in list");
break;
}
if (dot_state > 1)
error(unbound_object,
"read: more than one element after dot in list");
unget_character(c,port);
element = read_object(port);
if (EOF_P(element)) {
the_list = element;
break;
} else if (DOT_P(element)) {
if (NULL_P(the_list))
error(unbound_object,"read: dot in null list");
else if (!dot_state)
dot_state++;
else
error(unbound_object,"read: more than one dot in list");
} else if (dot_state == 1) {
if (!NULL_P(the_tail)) {
dot_state++;
CDR(the_tail) = element;
} else
error(unbound_object,
"read: expected element before dot in list");
} else {
temp = cons(element, null_object);
if (!NULL_P(the_tail)) {
CDR(the_tail) = temp;
} else
the_list = temp;
the_tail = temp;
}
}
POP_GC_PROTECT(2);
return (c == -1)? eof_object : the_list;
}
static int named_character(char *name) {
if (!strcmpci(name,"space"))
return CHAR_SPACE;
else if (!strcmpci(name,"newline"))
return CHAR_NEWLINE;
else if (!strcmpci(name,"return"))
return CHAR_RETURN;
else if (!strcmpci(name,"backspace"))
return CHAR_BACKSPACE;
else if (!strcmpci(name,"tab"))
return CHAR_TAB;
else if (!strcmpci(name,"escape"))
return CHAR_ESCAPE;
else if (!strcmpci(name,"rubout"))
return CHAR_RUBOUT;
else if (!strcmpci(name,"null"))
return CHAR_NULL;
else if (!strcmpci(name,"f1"))
return CHAR_F1;
else if (!strcmpci(name,"f2"))
return CHAR_F2;
else if (!strcmpci(name,"f3"))
return CHAR_F3;
else if (!strcmpci(name,"f4"))
return CHAR_F4;
else if (!strcmpci(name,"f5"))
return CHAR_F5;
else if (!strcmpci(name,"f6"))
return CHAR_F6;
else if (!strcmpci(name,"f7"))
return CHAR_F7;
else if (!strcmpci(name,"f8"))
return CHAR_F8;
else if (!strcmpci(name,"f9"))
return CHAR_F9;
else if (!strcmpci(name,"f10"))
return CHAR_F10;
else if (!strcmpci(name,"f11"))
return CHAR_F11;
else if (!strcmpci(name,"f12"))
return CHAR_F12;
else if (!strcmpci(name,"left"))
return CHAR_LEFT;
else if (!strcmpci(name,"down"))
return CHAR_DOWN;
else if (!strcmpci(name,"up"))
return CHAR_UP;
else if (!strcmpci(name,"right"))
return CHAR_RIGHT;
else if (!strcmpci(name,"print"))
return CHAR_PRINT;
else if (!strcmpci(name,"pause"))
return CHAR_PAUSE;
else if (!strcmpci(name,"home"))
return CHAR_HOME;
else if (!strcmpci(name,"end"))
return CHAR_END;
else if (!strcmpci(name,"pageup"))
return CHAR_PAGEUP;
else if (!strcmpci(name,"pagedown"))
return CHAR_PAGEDOWN;
else if (!strcmpci(name,"insert"))
return CHAR_INSERT;
else if (!strcmpci(name,"delete"))
return CHAR_DELETE;
else
return -1;
}
static object read_string(object port) {
long size = 0, escape = 0, max = BUFFER_CAPACITY(scratch_buffer);
char *buf = BUFFER_DATA(scratch_buffer);
int c, c2;
PUSH_GC_PROTECT(port);
while ((c = get_character(port)) != -1) {
if (escape) {
escape = 0;
switch (c) {
case '\\':
case '"':
buf[size++] = c;
break;
case 'e':
buf[size++] = CHAR_ESCAPE;
break;
case 'n':
buf[size++] = CHAR_NEWLINE;
break;
case 't':
buf[size++] = CHAR_TAB;
break;
case 'r':
buf[size++] = CHAR_RETURN;
break;
case 'C':
case 'c':
c2 = get_character(port);
if (c2 == '-') {
c2 = get_character(port);
if (c2 >= 'a' && c2 <= 'z') c2 -= ('a' - 'A');
if (c2 > '@' && c2 <= 'Z') {
buf[size++] = c2 - '@';
break;
}
}
/* fall through to error case */
default:
error(unbound_object,
"read: bad escape character in string: \\%c",c);
}
} else if (c == '"')
break;
else if (c == '\\')
escape = 1;
else {
escape = 0;
buf[size++] = c;
}
if (size >= max) {
max *= 2;
BUFFER_LENGTH(scratch_buffer) = max;
scratch_buffer = grow_buffer(scratch_buffer,max);
buf = BUFFER_DATA(scratch_buffer);
}
}
POP_GC_PROTECT(1);
if (c == -1)
return eof_object;
else {
object s;
buf[size] = '\0';
s = make_string(buf);
return s;
}
}
static object read_vector(object port) {
object buffer = make_buffer(32);
long size = 0, max = BUFFER_CAPACITY(buffer) / sizeof(object);
char c;
object element = null_object;
object *buf = NULL;
PUSH_GC_PROTECT(buffer);
PUSH_GC_PROTECT(port);
PUSH_GC_PROTECT(element);
while ((c = get_character(port)) != -1) {
if (WHITESPACE_P(c)) continue;
if (COMMENT_P(c)) {
if (EOF_P(read_comment(port)))
return eof_object;
else
continue;
}
if (c == ')') break;
unget_character(c,port);
element = read_object(port);
if (EOF_P(element)) {
POP_GC_PROTECT(2);
return element;
}
if (size >= max) {
max *= 2;
BUFFER_LENGTH(buffer) = size * sizeof(object);
buffer = grow_buffer(buffer,max*sizeof(object));
}
buf = (object *)BUFFER_DATA(buffer);
buf[size++] = element;
}
if (c == -1) {
POP_GC_PROTECT(3);
return eof_object;
} else {
object v = make_vector(size,null_object);
object *src = (object *)BUFFER_DATA(buffer), *dst = VECTOR_ELEMENTS(v);
while (size--)
*dst++ = *src++;
POP_GC_PROTECT(3);
return v;
}
}
object parse_rational(char *src, long radix, long exact) {
char c, *p, *d, buf[MAX_ATOM+1];
double val;
if (*src == '/') return void_object;
strcpy(buf,src);
d = buf;
d = strchr(buf,'/');
*d++ = '\0';
if (!*d) return void_object;
p = buf;
while ((c = *p++) != 0) if (!DIGIT_P(c)) return void_object;
p = d;
while ((c = *p++) != 0) if (!DIGIT_P(c)) return void_object;
/* Rationals are read in as real numbers, since they aren't supported. */
val = atof(d);
if (val == 0)
error(intern(src),"Rational number cannot have 0 as denominator");
val = atof(buf)/val;
return make_flonum(val);
}
object parse_number(char *buf, long radix, long exact) {
char c, *p;
long dot = 0, exponent = 0;
double val;
long digits = 0;
p = buf;
if (strchr(p,'/')) return parse_rational(buf,radix,exact);
if (*p == '+' || *p == '-') p++;
while ((c = *p++) != 0) {
if (c == '.') {
if (dot++) return void_object;
} else if (c == 'e') {
if (!digits) return void_object;
if (exponent++) return void_object;
dot = digits = 0;
if (*p == '+' || *p == '-') p++;
} else if (!(radix == 16 && HEXDIGIT_P(c)) && !DIGIT_P(c))
return void_object;
else
digits++;
}
if (!digits) return void_object;
if (radix == 10 || dot) {
val = atof(buf);
} else if (radix == 16) {
long n;
sscanf(buf,"%lx",&n);
val = n;
} else if (radix == 8) {
long n;
sscanf(buf,"%lo",&n);
val = n;
} else {
val = 0;
error(MAKE_FIXNUM(radix),"unsupported radix");
}
if (!dot && !exponent && val <= MAX_FIXNUM && val >= MIN_FIXNUM)
return MAKE_FIXNUM((long)val);
else
return make_flonum(val);
}
static object read_character(object port) {
char ctmp, c = get_character(port);
if (c == -1) return eof_object;
ctmp = get_character(port);
if (c == -1) return eof_object;
if (WHITESPACE_P(ctmp) || DELIMITER_P(ctmp)) {
/* a normal character literal */
unget_character(ctmp,port);
} else {
/* maybe a named character */
#define BUFSIZE 64
int i = BUFSIZE-2;
char buf[BUFSIZE];
char *p = buf;
*p++ = '#'; *p++ = '\\'; *p++ = c; *p++ = ctmp; *p = '\0';
c = get_character(port);
while (ALPHA_P(c) || DIGIT_P(c)) {
*p++ = c;
*p = '\0';
if (!i--) break;
c = get_character(port);
}
if (c == -1) return eof_object;
if (c == '-') {
/* i.e. ctrl-U */
*p++ = c; *p = '\0';
if (strcmpci(buf+2,"ctrl-")) goto bad_char_syntax;
c = get_character(port);
if (c == -1) return eof_object;
*p++ = c; *p = '\0';
if (c >= 'a' && c <= 'z') c -= ('a' - 'A');
c -= '@';
if (c < 0 || c >= 32) goto bad_char_syntax;
ctmp = get_character(port);
if (ctmp == -1) return eof_object;
*p++ = ctmp; *p = '\0';
if (!WHITESPACE_P(ctmp) && !DELIMITER_P(ctmp))
goto bad_char_syntax;
unget_character(ctmp,port);
return make_character(c);
} else if (WHITESPACE_P(c) || DELIMITER_P(c)) {
/* the normal case - a simple symbolic name */
int i = named_character(buf+2);
unget_character(c,port); /* the delimiter */
if (i > 0)
c = i;
else
goto bad_char_syntax;
} else {
bad_char_syntax:
error(unbound_object,"read: bad character literal: %s",buf);
}
}
return make_character(c);
}
static object read_line(object port) {
long size = 0, max = BUFFER_CAPACITY(scratch_buffer);
char c, *buf = BUFFER_DATA(scratch_buffer);
object result = false_object;
PUSH_GC_PROTECT(port);
PUSH_GC_PROTECT(result);
while ((c = get_character(port)) != -1) {
if (c == CHAR_RETURN) {
char c2 = get_character(port);
if (c2 != -1 && c2 != CHAR_NEWLINE)
unget_character(c2,port);
break;
} else if (c == CHAR_NEWLINE) break;
buf[size++] = c;
if (size >= max) {
max *= 2;
BUFFER_LENGTH(scratch_buffer) = max;
scratch_buffer = grow_buffer(scratch_buffer,max);
buf = BUFFER_DATA(scratch_buffer);
}
}
if (c == -1 && size == 0)
result = eof_object;
else {
buf[size] = '\0';
result = make_string(buf);
if (c == -1)
result = cons(false_object,result);
else
result = cons(true_object,result);
}
POP_GC_PROTECT(2);
return result;
}
static long read_atom_into_buf(char *buf, object port, char first_char) {
char c;
long i = 0;
object result;
result = unbound_object;
buf[i++] = first_char;
while ((c = get_character(port)) != -1) {
if (WHITESPACE_P(c)) break;
if (DELIMITER_P(c) || COMMENT_P(c)) {
unget_character(c,port);
break;
}
if (i < MAX_ATOM)
buf[i++] = c;
}
buf[i] = '\0';
return i;
}
static object read_object(object port) {
char c, buf[MAX_ATOM+1];
while ((c = get_character(port)) != -1) {
if (WHITESPACE_P(c)) {
continue;
} else if (COMMENT_P(c)) {
if (EOF_P(read_comment(port))) break;
else continue;
} else if (c == '(') {
return read_list(port);
} else if (c == ')') {
error(unbound_object,"unexpected ')'");
return void_object;
} else if (c == '"') {
return read_string(port);
} else if (c == '\'') {
object obj = read_object(port);
if (!EOF_P(obj))
return list2(intern("quote"),obj);
break;
} else if (c == ',') {
char d = get_character(port);
if (d != -1) {
object k,obj;
if (d == '@')
k = intern("unquote-splicing");
else {
k = intern("unquote");
unget_character(d,port);
}
obj = read_object(port);
if (!EOF_P(obj))
return list2(k,obj);
}
break;
} else if (c == '`') {
object obj = read_object(port);
if (!EOF_P(obj))
return list2(intern("quasiquote"),obj);
break;
} else if (c == '#') {
long i;
c = get_character(port);
if (c == -1) break;
if (c == '!')
return read_comment(port);
if (c == '(')
return read_vector(port);
if (c == '\\') { /* a character literal */
return read_character(port);
}
i = read_atom_into_buf(buf,port,c);
c = buf[0];
if (i == 1) {
if (c == 'f' || c == 'F') return false_object;
if (c == 't' || c == 'T') return true_object;
} else if (c == 'x' || c == 'X') {
object obj = parse_number(buf+1,16,-1);
if (NUMBER_P(obj)) return obj;
} else if (c == 'b' || c == 'B') {
object obj = parse_number(buf+1,2,-1);
if (NUMBER_P(obj)) return obj;
} else if (c == 'd' || c == 'D') {
object obj = parse_number(buf+1,10,-1);
if (NUMBER_P(obj)) return obj;
} else if (c == 'o' || c == 'O') {
object obj = parse_number(buf+1,8,-1);
if (NUMBER_P(obj)) return obj;
} else if (c == 'e' || c == 'i' || c == 'E' || c == 'I') {
long exactness = (c == 'e' || c == 'E');
object obj;
if (buf[1] == '#') {
char d = buf[2];
long radix;
if (d == 'b') radix = 2;
else if (d == 'x') radix = 16;
else if (d == 'o') radix = 8;
else if (d == 'd') radix = 10;
else radix = -1;
if (radix > 0) {
obj = parse_number(buf+3,radix,exactness);
if (NUMBER_P(obj)) return obj;
}
} else {
obj = parse_number(buf+1,10,exactness);
if (NUMBER_P(obj)) return obj;
}
}
error(unbound_object,"read: bad syntax: #%s",buf);
} else {
object obj;
long i = read_atom_into_buf(buf,port,c);
if (i == 1 && c == '.')
return dot_object;
obj = parse_number(buf,10,-1);
if (NUMBER_P(obj)) return obj;
#ifndef CASE_SENSITIVE
while (i--) {
char c = buf[i];
if (c >= 'A' && c <= 'Z') buf[i] = c + 'a' - 'A';
}
#endif
return intern(buf);
}
}
return eof_object;
}
object read_object_from_port(object inport) {
object tmp;
TYPE_CHECK(INPUT_PORT_P(inport),1,"input-port", inport);
tmp = read_object(inport);
return tmp;
}
/*
* Writing
*/
void write_character(object port, int c) {
(*(PORT_PUTC_PROC(port)))(port,c);
}
void write_string(object port,char *s) {
putc_proc_pointer p = PORT_PUTC_PROC(port);
while (*s) (*p)(port,*s++);
}
void printv(object port, char *format, va_list args) {
char buf[1024];
vsprintf(buf,format,args);
write_string(port,buf);
(PORT_FLUSH_PROC(port))(port);
}
void print(object port, char *format, ...) {
va_list args;
va_start(args,format);
printv(port,format,args);
va_end(args);
}
void number_to_string(object n, long radix, char *buf) {
if (FIXNUM_P(n)) {
long val = FIXNUM_VALUE(n);
switch (radix) {
case 10:
sprintf(buf,"%ld",val);
break;
case 16:
sprintf(buf,"%lx",val);
break;
case 8:
sprintf(buf,"%lo",val);
break;
default:
error(MAKE_FIXNUM(radix),"unsupported radix");
}
} else {
double d = the_double(1,n);
if (radix != 10) /* BUG: maybe shouldn't error on this */
error(MAKE_FIXNUM(radix),"radix must be 10 for an inexact number");
sprintf(buf,"%.8g",d);
}
}
static char *char_names[256];
void write_object(object port, object obj, long for_read) {
char buf[1024];
PUSH_GC_PROTECT(port);
PUSH_GC_PROTECT(obj);
if (NULL_P(obj)) {
write_character(port,'(');
write_character(port,')');
} else if (PAIR_P(obj)) {
if (eq_p(CAR(obj),quote_symbol) && length(obj) == 2) {
write_character(port,'\'');
write_object(port,CADR(obj),for_read);
} else if (eq_p(CAR(obj),quasiquote_symbol) && length(obj) == 2) {
write_character(port,'`');
write_object(port,CADR(obj),for_read);
} else if (eq_p(CAR(obj),unquote_symbol) && length(obj) == 2) {
write_character(port,',');
write_object(port,CADR(obj),for_read);
} else if (eq_p(CAR(obj),unquote_splicing_symbol) && length(obj) == 2){
write_string(port,",@");
write_object(port,CADR(obj),for_read);
} else {
long max = MAX_INT, count = 0;
object omax = global("system:*print-max*");
if (FIXNUM_P(omax)) max = FIXNUM_VALUE(omax);
write_character(port,'(');
while (count >= 0) {
if (count++ < max)
write_object(port,CAR(obj),for_read);
else {
count = -1;
write_string(port,"...");
}
obj = CDR(obj);
if (PAIR_P(obj))
write_character(port,' ');
else if (!NULL_P(obj)) {
write_string(port," . ");
write_object(port,obj,for_read);
break;
} else
break;
}
write_character(port,')');
}
} else if (BOOLEAN_P(obj)) {
write_character(port,'#');
write_character(port,TRUE_P(obj)? 't' : 'f');
} else if (UNBOUND_P(obj)) {
write_string(port,"#<unbound>");
} else if (VOID_P(obj)) {
write_string(port,"#<void>");
} else if (SYMBOL_P(obj)) {
write_string(port,SYMBOL_NAME(obj));
} else if (STRING_P(obj)) {
if (for_read) {
char c, *p = STRING_VALUE(obj);
write_character(port,'"');
while ((c = *p++) != 0) {
if (c == '"' || c == '\\')
write_character(port,'\\');
write_character(port,c);
}
write_character(port,'"');
} else
write_string(port,STRING_VALUE(obj));
} else if (FRAME_P(obj)) {
write_string(port,"#<call-frame>");
} else if (BUFFER_P(obj)) {
sprintf(buf,"#<buffer (%ld)>",BUFFER_LENGTH(obj));
write_string(port,buf);
} else if (SYMBOLTABLE_P(obj)) {
write_string(port,"#<symboltable>");
} else if (FLONUM_P(obj)) {
if (for_read)
sprintf(buf,"%#.6g", FLONUM_VALUE(obj));
else
sprintf(buf,"%.8g", FLONUM_VALUE(obj));
write_string(port,buf);
} else if (CHARACTER_P(obj)) {
int c = CHARACTER_VALUE(obj);
if (for_read) {
char *name = char_names[(unsigned char)c];
if (name) {
write_string(port,name);
} else if (c >= 0 && c <= 32) {
write_string(port,"#\\ctrl-");
write_character(port,c+'@');
} else {
write_string(port,"#\\");
write_character(port,c);
}
} else
write_character(port,c);
} else if (FIXNUM_P(obj)) {
sprintf(buf,"%ld",FIXNUM_VALUE(obj));
write_string(port,buf);
} else if (VECTOR_P(obj)) {
long i, max = VECTOR_LENGTH(obj);
object *elements = VECTOR_ELEMENTS(obj);
if (FALSE_P(VECTOR_TAG(obj))) {
write_string(port,"#(");
for (i=0; i<max; i++) {
object o = elements[i];
if (i) write_character(port,' ');
write_object(port,o,for_read);
}
write_character(port,')');
} else {
write_string(port,"#<");
write_object(port,VECTOR_TAG(obj),0);
write_string(port,">");
}
} else if (SIGNAL_P(obj)) {
long i, max = SIGNAL_LENGTH(obj);
double *elements = SIGNAL_ELEMENTS(obj);
write_string(port,"#(");
for (i=0; i<max; i++) {
double d = elements[i];
if (i) write_character(port,' ');
if (for_read)
sprintf(buf,"%#.6g", d);
else
sprintf(buf,"%.8g", d);
write_string(port,buf);
}
write_character(port,')');
} else if (OPCODE_P(obj)) {
sprintf(buf,"#<procedure %s>", opcode_name(obj));
write_string(port,buf);
} else if (PRIMOP_P(obj)) {
sprintf(buf,"#<procedure %s>", PRIMOP_NAME(obj));
write_string(port,buf);
} else if (CLOSURE_P(obj)) {
char *name = CLOSURE_NAME(obj);
if (name) {
sprintf(buf,"#<closure %s>",name);
} else {
sprintf(buf,"#<anonymous closure>");
}
write_string(port,buf);
} else if (PROCEDURE_P(obj)) {
char *name = PROC_NAME(obj);
if (name) {
sprintf(buf,"#<procedure %s>",name);
} else {
sprintf(buf,"#<anonymous procedure>");
}
write_string(port,buf);
} else if (CONTINUATION_P(obj)) {
write_string(port,"#<continuation>");
} else if (EOF_P(obj)) {
write_string(port,"#<eof>");
} else if (INPUT_PORT_P(obj)) {
if (PORT_IS_OPEN_P(obj)) {
if (PORT_STRING_P(obj))
sprintf(buf,"#<input-string-port>");
else
sprintf(buf,"#<input-port %s>", PORT_NAME(obj));
} else
sprintf(buf,"#<input-port CLOSED>");
write_string(port,buf);
} else if (WEAK_P(obj)) {
write_string(port,"#<weak-binding>");
} else if (OUTPUT_PORT_P(obj)) {
if (PORT_IS_OPEN_P(obj)) {
if (PORT_STRING_P(obj))
sprintf(buf,"#<output-string-port>");
else
sprintf(buf,"#<output-port %s>", PORT_NAME(obj));
} else
sprintf(buf,"#<output-port CLOSED>");
write_string(port,buf);
} else if (FORWARDED_P(obj)) {
write_string(port,"#<FORWARDED ");
write_object(port,FORWARDED_POINTER(obj),for_read);
write_string(port,">");
} else {
if (POINTER_P(obj))
sprintf(buf,"#<bizarre %ld>",POINTER_TYPE(obj));
else
sprintf(buf,"#<bizarre %lx>",obj);
write_string(port,buf);
}
POP_GC_PROTECT(2);
}
void write_object_to_port(object outport, object obj, long for_read) {
TYPE_CHECK(OUTPUT_PORT_P(outport),1,"output-port", outport);
write_object(outport,obj,for_read);
}
static void primop_newline(long argc) {
object p = argc? *sp++ : global("system:*current-output-port*");
TYPE_CHECK(OUTPUT_PORT_P(p),1,"output-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot write to a closed port");
write_string(p,newline_string(p));
*--sp = void_object;
}
static void primop_write_char(long argc) {
object p = (argc == 2)? sp[1] : global("system:*current-output-port*");
char c = the_char(1,sp[0]);
TYPE_CHECK(OUTPUT_PORT_P(p),2,"output-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot write to a closed port");
write_character(p,c);
if (argc == 2) sp++;
*sp = void_object;
}
static void primop_write_string(long argc) {
object s = *sp++;
object p = *sp++;
char *sz;
TYPE_CHECK(STRING_P(s),1,"string",s);
TYPE_CHECK(OUTPUT_PORT_P(p),2,"output-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot write to a closed port");
sz = STRING_VALUE(s);
while (*sz) {
write_character(p,*sz++);
}
*--sp = void_object;
}
static void primop_write_chars(long argc) {
int i;
object p = *sp++;
TYPE_CHECK(OUTPUT_PORT_P(p),1,"output-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot write to a closed port");
for (i=1; i<argc; i++) {
char c = the_char(1,*sp++);
write_character(p,c);
}
*--sp = void_object;
}
static void primop_write_fixnums(long argc) {
int i;
object p = *sp++;
TYPE_CHECK(OUTPUT_PORT_P(p),1,"output-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot write to a closed port");
for (i=1; i<argc; i++) {
char c = (char)the_long(1,*sp++);
write_character(p,c);
}
*--sp = void_object;
}
static void primop_write(long argc) {
object p = (argc == 2)? sp[1] : global("system:*current-output-port*");
TYPE_CHECK(OUTPUT_PORT_P(p),2,"output-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot write to a closed port");
write_object(p,*sp,1);
if (argc == 2) sp++;
*sp = void_object;
}
static void primop_display(long argc) {
object p = (argc == 2)? sp[1] : global("system:*current-output-port*");
TYPE_CHECK(OUTPUT_PORT_P(p),2,"output-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot write to a closed port");
write_object(p,sp[0],0);
if (argc == 2) sp++;
*sp = void_object;
}
static void primop_read(long argc) {
object p = (argc == 1)? sp[0] : global("system:*current-input-port*");
TYPE_CHECK(INPUT_PORT_P(p),2,"input-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot read from a closed port");
p = read_object_from_port(p);
if (argc == 1)
*sp = p;
else
*--sp = p;
}
static void primop_read_char(long argc) {
char c;
object p = (argc == 1)? sp[0] : global("system:*current-input-port*");
TYPE_CHECK(INPUT_PORT_P(p),2,"input-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot read from a closed port");
c = get_character(p);
p = (c == -1)? eof_object : make_character(c);
if (argc)
*sp = p;
else
*--sp = p;
}
static void primop_peek_char(long argc) {
char c;
object p = (argc == 1)? sp[0] : global("system:*current-input-port*");
TYPE_CHECK(INPUT_PORT_P(p),2,"input-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot read from a closed port");
c = get_character(p);
unget_character(c,p);
p = (c == -1)? eof_object : make_character(c);
if (argc)
*sp = p;
else
*--sp = p;
}
static void primop_char_ready_p(long argc) {
object p = (argc == 1)? sp[0] : global("system:*current-input-port*");
TYPE_CHECK(INPUT_PORT_P(p),2,"input-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot read from a closed port");
p = ((PORT_READY_PROC(p))(p))? true_object : false_object;
if (argc)
*sp = p;
else
*--sp = p;
}
static void primop_eof_p(long argc) {
if (!EOF_P(*sp)) *sp = false_object;
}
static void primop_read_line(long argc) {
object p = (argc == 1)? sp[0] : global("system:*current-input-port*");
TYPE_CHECK(INPUT_PORT_P(p),2,"input-port",p);
if (!PORT_IS_OPEN_P(p))
error(p,"Cannot read from a closed port");
p = read_line(p);
if (argc)
*sp = p;
else
*--sp = p;
}
static char *string_value(object o) {
if (SYMBOL_P(o)) return SYMBOL_NAME(o);
if (!STRING_P(o))
error(o,"Not a string or symbol");
return STRING_VALUE(o);
}
int find_file(char *buf, char *name) {
static char dir_buf[MAX_FILENAME_LENGTH];
object dirs = global("system:*search-path*");
if (name[0] == '~') {
expand_path(buf,name);
if (does_file_exist(buf)) return 1;
strcat(buf,".scm");
if (does_file_exist(buf)) return 1;