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/* File object implementation */
/* XXX This should become a built-in module 'io'. It should support more
functionality, better exception handling for invalid calls, etc.
(Especially reading on a write-only file or vice versa!)
It should also cooperate with posix to support popen(), which should
share most code but have a special close function. */
#include "allobjects.h"
#include "errno.h"
#ifndef errno
extern int errno;
#endif
typedef struct {
OB_HEAD
FILE *f_fp;
object *f_name;
object *f_mode;
/* XXX Should move the 'need space' on printing flag here */
} fileobject;
FILE *
getfilefile(f)
object *f;
{
if (!is_fileobject(f)) {
err_badcall();
return NULL;
}
return ((fileobject *)f)->f_fp;
}
object *
newopenfileobject(fp, name, mode)
FILE *fp;
char *name;
char *mode;
{
fileobject *f = NEWOBJ(fileobject, &Filetype);
if (f == NULL)
return NULL;
f->f_fp = NULL;
f->f_name = newstringobject(name);
f->f_mode = newstringobject(mode);
if (f->f_name == NULL || f->f_mode == NULL) {
DECREF(f);
return NULL;
}
f->f_fp = fp;
return (object *) f;
}
object *
newfileobject(name, mode)
char *name, *mode;
{
fileobject *f;
FILE *fp;
f = (fileobject *) newopenfileobject((FILE *)NULL, name, mode);
if (f == NULL)
return NULL;
#ifdef THINK_C
if (*mode == '*') {
FILE *fopenRF();
f->f_fp = fopenRF(name, mode+1);
}
else
#endif
f->f_fp = fopen(name, mode);
if (f->f_fp == NULL) {
err_errno(RuntimeError);
DECREF(f);
return NULL;
}
return (object *)f;
}
/* Methods */
static void
file_dealloc(f)
fileobject *f;
{
if (f->f_fp != NULL)
fclose(f->f_fp);
if (f->f_name != NULL)
DECREF(f->f_name);
if (f->f_mode != NULL)
DECREF(f->f_mode);
free((char *)f);
}
static void
file_print(f, fp, flags)
fileobject *f;
FILE *fp;
int flags;
{
fprintf(fp, "<%s file ", f->f_fp == NULL ? "closed" : "open");
printobject(f->f_name, fp, flags);
fprintf(fp, ", mode ");
printobject(f->f_mode, fp, flags);
fprintf(fp, ">");
}
static object *
file_repr(f)
fileobject *f;
{
char buf[300];
/* XXX This differs from file_print if the filename contains
quotes or other funny characters. */
sprintf(buf, "<%s file '%.256s', mode '%.10s'>",
f->f_fp == NULL ? "closed" : "open",
getstringvalue(f->f_name),
getstringvalue(f->f_mode));
return newstringobject(buf);
}
static object *
file_close(f, args)
fileobject *f;
object *args;
{
if (args != NULL) {
err_badarg();
return NULL;
}
if (f->f_fp != NULL) {
fclose(f->f_fp);
f->f_fp = NULL;
}
INCREF(None);
return None;
}
static object *
file_read(f, args)
fileobject *f;
object *args;
{
int n;
object *v;
if (f->f_fp == NULL) {
err_badarg();
return NULL;
}
if (args == NULL || !is_intobject(args)) {
err_badarg();
return NULL;
}
n = getintvalue(args);
if (n < 0) {
err_badarg();
return NULL;
}
v = newsizedstringobject((char *)NULL, n);
if (v == NULL)
return NULL;
n = fread(getstringvalue(v), 1, n, f->f_fp);
/* EOF is reported as an empty string */
/* XXX should detect real I/O errors? */
resizestring(&v, n);
return v;
}
/* XXX Should this be unified with raw_input()? */
static object *
file_readline(f, args)
fileobject *f;
object *args;
{
int n;
object *v;
if (f->f_fp == NULL) {
err_badarg();
return NULL;
}
if (args == NULL) {
n = 10000; /* XXX should really be unlimited */
}
else if (is_intobject(args)) {
n = getintvalue(args);
if (n < 0) {
err_badarg();
return NULL;
}
}
else {
err_badarg();
return NULL;
}
v = newsizedstringobject((char *)NULL, n);
if (v == NULL)
return NULL;
#ifndef THINK_C_3_0
/* XXX Think C 3.0 wrongly reads up to n characters... */
n = n+1;
#endif
if (fgets(getstringvalue(v), n, f->f_fp) == NULL) {
/* EOF is reported as an empty string */
/* XXX should detect real I/O errors? */
n = 0;
}
else {
n = strlen(getstringvalue(v));
}
resizestring(&v, n);
return v;
}
static object *
file_write(f, args)
fileobject *f;
object *args;
{
int n, n2;
if (f->f_fp == NULL) {
err_badarg();
return NULL;
}
if (args == NULL || !is_stringobject(args)) {
err_badarg();
return NULL;
}
errno = 0;
n2 = fwrite(getstringvalue(args), 1, n = getstringsize(args), f->f_fp);
if (n2 != n) {
if (errno == 0)
errno = EIO;
err_errno(RuntimeError);
return NULL;
}
INCREF(None);
return None;
}
static struct methodlist file_methods[] = {
{"write", file_write},
{"read", file_read},
{"readline", file_readline},
{"close", file_close},
{NULL, NULL} /* sentinel */
};
static object *
file_getattr(f, name)
fileobject *f;
char *name;
{
return findmethod(file_methods, (object *)f, name);
}
typeobject Filetype = {
OB_HEAD_INIT(&Typetype)
0,
"file",
sizeof(fileobject),
0,
file_dealloc, /*tp_dealloc*/
file_print, /*tp_print*/
file_getattr, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
file_repr, /*tp_repr*/
};
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