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stk/Src/io.c

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/*
* i o . c -- Low level I/O
*
* Copyright © 1993-1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
*
*
* Permission to use, copy, modify, distribute,and license this
* software and its documentation for any purpose is hereby granted,
* provided that existing copyright notices are retained in all
* copies and that this notice is included verbatim in any
* distributions. No written agreement, license, or royalty fee is
* required for any of the authorized uses.
* This software is provided ``AS IS'' without express or implied
* warranty.
*
* Author: Erick Gallesio [eg@kaolin.unice.fr]
* Creation date: ????
* Last file update: 3-Sep-1999 20:20 (eg)
*/
#ifdef WIN32
# include <windows.h>
# include <io.h>
# include <fcntl.h>
# define TCL_EVENT_FLAG TCL_DONT_WAIT /* (FIXME) */
#else
# include <sys/ioctl.h>
# include <sys/time.h>
# include <ctype.h>
# define TCL_EVENT_FLAG 0
# ifdef HAVE_SYS_SELECT_H
# include <sys/select.h> /* This seems to be useful only for AIX */
# endif
# ifndef NO_FD_SET
# define SELECT_MASK fd_set
# else
# ifndef _AIX
typedef long fd_mask;
# endif
# if defined(_IBMR2)
# define SELECT_MASK void
# else
# define SELECT_MASK int
# endif
# endif
#endif
#include "stk.h"
#include "sport.h"
#include "vport.h"
#define BUFFER_SIZE 512
#define SYSTEM(instr) { instr; }
#ifdef max
# undef max
#endif
#define max(a,b) ((a)>(b)? (a) : (b))
#ifdef _STDIO_USES_IOSTREAM /* GNU libc */
# if defined(_IO_STDIO_H) || defined (linux)
# define READ_DATA_PENDING(fp) (max(0,(fp)->_IO_read_end - (fp)->_IO_read_ptr))
# else
# define READ_DATA_PENDING(fp) (max(0,(fp)->_egptr - (fp)->_gptr))
# endif
#endif
#if (!defined (READ_DATA_PENDING)) && defined __SLBF
# define READ_DATA_PENDING(fp) (max(0,fp->_r))
#endif
#if !defined (READ_DATA_PENDING)
# ifdef WIN32
# define READ_DATA_PENDING(fp) (1)
# else
# define READ_DATA_PENDING(fp) (fp->_cnt)
# endif
#endif
static char static_buffer[BUFFER_SIZE+1], *buffer = static_buffer;
static int bufidx=0;
static int count=-1;
static int filled=0;
void STk_StdinProc()
{
buffer = static_buffer;
for ( ; ; ) {
errno = 0;
SYSTEM(count = read(fileno(PORT_FILE(STk_stdin)), buffer, BUFFER_SIZE););
if (count != -1 || errno != EINTR) break;
}
filled = 1;
STk_control_C = 0; /* neglect ^C which arose when waiting an input */
}
void STk_fill_stdin_buffer(char *s)
{
/* This procedure is called by the console to simulate the arrival of
* characters on stdin. The string is GC protected */
count = strlen(s);
buffer = s;
filled = 1;
}
static int file_data_available(SCM port)
{
return ( (PORT_UNGETC(port) != EOF) ||
((port == STk_stdin) && (bufidx < count)) ||
(READ_DATA_PENDING(PORT_FILE(port))) );
}
/*****************************************************************************/
int STk_getc(SCM port)
{
int result = PORT_UNGETC(port);
/* Ungetted character ? */
if (result != EOF) {
PORT_UNGETC(port) = EOF;
return result;
}
/* Stdin */
if (port == STk_stdin) {
if (bufidx < count) return buffer[bufidx++];
else {
#ifdef USE_TK
if (Tk_initialized && STk_interactivep) {
filled = 0;
while (!filled && !STk_control_C) {
Tcl_DoOneEvent(TCL_EVENT_FLAG);
if (Tk_GetNumMainWindows() <= 0) return EOF;
}
}
else
STk_StdinProc();
#else
STk_StdinProc();
#endif
if (count <= 0) return EOF;
else {
bufidx = 1;
return *buffer;
}
}
}
/* Otherwise */
switch (TYPE(port)) {
case tc_iport : for ( ; ; ) {
errno = 0; /* OSF does not set errno to 0 before a read ! */
SYSTEM(result=getc(PORT_FILE(port)));
if (result != EOF || errno != EINTR) break;
}
return result;
case tc_isport: {
register struct str_iob *f;
f = (struct str_iob *) PORT_FILE(port);
return (--(f->cnt)>=0? ((int)*f->ptr++): EOF);
}
case tc_ivport: {
register struct virtual_iob *f;
SCM proc_eof, proc_getc, res;
f = (struct virtual_iob *) PORT_FILE(port);
proc_eof = f->eofp;
proc_getc = f->getc;
if (proc_eof == Ntruth || proc_getc == Ntruth) {
/* No eof or getc_procedure => always EOF */
return EOF;
}
if (Apply1(proc_eof, port) == Ntruth) {
/* Not eof */
res = Apply1(proc_getc, port);
return (res == STk_eof_object) ? EOF: CHAR(res);
} else {
/* eof procedure says we have an eof */
return EOF;
}
}
default: Err("INTERNAL ERROR in STk_getc", NIL);
return 0;
}
}
int STk_ungetc(int c, SCM port)
{
int result = PORT_UNGETC(port);
if (result != EOF) STk_err("INTERNAL ERROR: cannot unget character", NIL);
PORT_UNGETC(port) = c;
return c;
}
int STk_putc(int c, SCM port)
{
ENTER_PRIMITIVE("write-char");
switch (TYPE(port)) {
case tc_oport : SYSTEM(c=fputc(c, PORT_FILE(port)));
/* Signal an error if write fails. We can't do better here */
if (c == EOF) Serror("write error", NIL);
break;
case tc_osport: {
register struct str_iob *f;
register unsigned int tmp;
f = (struct str_iob *) PORT_FILE(port);
if (++f->cnt == f->bufsiz) {
tmp = f->bufsiz;
tmp += tmp/2;
f->base = must_realloc(f->base, tmp);
f->ptr = f->base + f->bufsiz - 1; /* base can move */
f->bufsiz = tmp;
}
*f->ptr++ = (unsigned char) c;
break;
}
case tc_ovport: {
register struct virtual_iob *f;
SCM res, proc;
f = (struct virtual_iob *) PORT_FILE(port);
proc = f->putc;
if (proc == Ntruth) /* No putc function: return EOF */
return EOF;
else {
res = Apply2(proc, STk_makechar(c), port);
if (res == STk_eof_object) Serror("write error", NIL);
}
}
}
return c;
}
int STk_puts(char *s, SCM port)
{
ENTER_PRIMITIVE("write");
switch (TYPE(port)) {
case tc_oport : {
int result;
SYSTEM(result = fputs(s, PORT_FILE(port)));
if (result == EOF) Serror("write-error", NIL);
return result;
}
case tc_osport: {
register struct str_iob *f;
register unsigned int tmp;
f = (struct str_iob *) PORT_FILE(port);
for ( ; *s; s++) {
if (++f->cnt == f->bufsiz) {
tmp = f->bufsiz;
tmp += tmp/2;
f->base = must_realloc(f->base, tmp);
f->ptr = f->base + f->bufsiz - 1; /* base can move */
f->bufsiz = tmp;
}
*f->ptr++ = (unsigned char) *s;
}
return 0;
}
case tc_ovport: {
register struct virtual_iob *f;
SCM res, proc;
f = (struct virtual_iob *) PORT_FILE(port);
proc = f->puts;
if (proc == Ntruth) /* No putc function: return EOF */
return EOF;
else {
res = Apply2(proc, STk_makestring(s), port);
if (res ==STk_eof_object) Serror("write error", NIL);
}
}
/* NO BREAK */
default: return 0;
}
}
int STk_eof(SCM port)
{
switch (TYPE(port)) {
case tc_iport : {
int result;
SYSTEM(result = feof(PORT_FILE(port)));
return result;
}
case tc_isport: {
register struct str_iob *f;
f = (struct str_iob *) PORT_FILE(port);
return f->cnt <= 0;
}
case tc_ivport: {
register struct virtual_iob *f;
SCM proc;
f = (struct virtual_iob *) PORT_FILE(port);
proc = f->eofp;
return (proc == Ntruth) ? 1 : (Apply1(proc, port) != Ntruth);
}
default: return 1; /* always EOF on output files */
}
}
int STk_internal_flush(SCM port)
{
switch (TYPE(port)) {
case tc_oport : {
int result;
SYSTEM(result = fflush(PORT_FILE(port)));
return result;
}
case tc_ovport: {
register struct virtual_iob *f;
SCM proc;
f = (struct virtual_iob *) PORT_FILE(port);
proc = f->flush;
return (proc == Ntruth) ? 0 : (Apply1(proc, port) != Ntruth);
}
default: return 0; /* i.e. always works on other ports */
}
}
int STk_internal_char_readyp(SCM port)
{
switch (TYPE(port)) {
case tc_iport : {
if (file_data_available(port)) return 1;
#ifdef WIN32
panic("char-ready?: Not yet implemented!");
#else
# ifdef HAVE_SELECT
{
SELECT_MASK readfds;
struct timeval timeout;
int f = fileno(PORT_FILE(port));
FD_ZERO(&readfds);
FD_SET(f, &readfds);
timeout.tv_sec = timeout.tv_usec = 0;
return (select(f+1, &readfds, NULL, NULL, &timeout));
}
# else
# ifdef FIONREAD
{
int result;
ioctl(fileno(PORT_FILE(port)), FIONREAD, &result);
return result;
}
# else
return 1;
# endif
# endif
#endif
}
case tc_isport: return 1;
case tc_ivport: {
register struct virtual_iob *f;
SCM proc;
f = (struct virtual_iob *) PORT_FILE(port);
proc = f->readyp;
return (proc == Ntruth) ? 1 : (Apply1(proc, port) != Ntruth);
}
default: return 1; /* always EOF on output files */
}
}
void STk_close(SCM port)
{
if (PORT_FLAGS(port) & PORT_CLOSED) /* already closed */ return;
STk_internal_flush(port);
switch (TYPE(port)) {
case tc_iport :
case tc_oport : STk_close_file_port(port); break;
case tc_ivport:
case tc_ovport: {
register struct virtual_iob *f;
SCM proc;
f = (struct virtual_iob *) PORT_FILE(port);
proc = f->close;
if (proc != Ntruth) Apply1(proc, port);
}
}
PORT_FLAGS(port) |= PORT_CLOSED;
}
void STk_fprintf(SCM port, char *format, ...)
{
va_list ap;
char buffer[MAX_FPRINTF];
va_start(ap, format);
vsprintf(buffer, format, ap);
Puts(buffer, port);
}
char *STk_line_bufferize_io(SCM port)
{
if (IPORTP(port) || OPORTP(port)) {
char *buff= STk_must_malloc(BUFFER_SIZE);
setvbuf(PORT_FILE(port), buff, _IOLBF, BUFFER_SIZE);
return buff;
}
return NULL;
}
void STk_init_io(void)
{
STk_stdin = STk_stdout = STk_stderr = NULL;
STk_curr_iport = STk_curr_oport = STk_curr_eport = NULL;
}
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