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434 lines
8.3 KiB
C
434 lines
8.3 KiB
C
/***********************************************************
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Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
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Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* File object implementation */
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/* XXX This should become a built-in module 'io'. It should support more
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functionality, better exception handling for invalid calls, etc.
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(Especially reading on a write-only file or vice versa!)
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It should also cooperate with posix to support popen(), which should
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share most code but have a special close function. */
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#include "allobjects.h"
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#define BUF(v) GETSTRINGVALUE((stringobject *)v)
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#include "errno.h"
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#ifndef errno
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extern int errno;
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#endif
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typedef struct {
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OB_HEAD
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FILE *f_fp;
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object *f_name;
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object *f_mode;
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/* XXX Should move the 'need space' on printing flag here */
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} fileobject;
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FILE *
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getfilefile(f)
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object *f;
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{
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if (!is_fileobject(f)) {
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err_badcall();
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return NULL;
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}
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return ((fileobject *)f)->f_fp;
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}
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object *
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newopenfileobject(fp, name, mode)
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FILE *fp;
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char *name;
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char *mode;
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{
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fileobject *f = NEWOBJ(fileobject, &Filetype);
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if (f == NULL)
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return NULL;
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f->f_fp = NULL;
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f->f_name = newstringobject(name);
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f->f_mode = newstringobject(mode);
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if (f->f_name == NULL || f->f_mode == NULL) {
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DECREF(f);
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return NULL;
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}
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f->f_fp = fp;
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return (object *) f;
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}
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object *
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newfileobject(name, mode)
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char *name, *mode;
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{
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fileobject *f;
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FILE *fp;
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f = (fileobject *) newopenfileobject((FILE *)NULL, name, mode);
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if (f == NULL)
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return NULL;
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#ifdef THINK_C
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if (*mode == '*') {
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FILE *fopenRF();
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f->f_fp = fopenRF(name, mode+1);
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}
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else
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#endif
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f->f_fp = fopen(name, mode);
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if (f->f_fp == NULL) {
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err_errno(RuntimeError);
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DECREF(f);
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return NULL;
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}
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return (object *)f;
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}
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/* Methods */
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static void
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file_dealloc(f)
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fileobject *f;
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{
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if (f->f_fp != NULL)
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fclose(f->f_fp);
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if (f->f_name != NULL)
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DECREF(f->f_name);
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if (f->f_mode != NULL)
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DECREF(f->f_mode);
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free((char *)f);
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}
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static void
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file_print(f, fp, flags)
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fileobject *f;
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FILE *fp;
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int flags;
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{
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fprintf(fp, "<%s file ", f->f_fp == NULL ? "closed" : "open");
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printobject(f->f_name, fp, flags);
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fprintf(fp, ", mode ");
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printobject(f->f_mode, fp, flags);
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fprintf(fp, ">");
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}
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static object *
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file_repr(f)
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fileobject *f;
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{
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char buf[300];
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/* XXX This differs from file_print if the filename contains
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quotes or other funny characters. */
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sprintf(buf, "<%s file '%.256s', mode '%.10s'>",
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f->f_fp == NULL ? "closed" : "open",
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getstringvalue(f->f_name),
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getstringvalue(f->f_mode));
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return newstringobject(buf);
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}
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static object *
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file_close(f, args)
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fileobject *f;
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object *args;
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{
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if (args != NULL) {
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err_badarg();
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return NULL;
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}
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if (f->f_fp != NULL) {
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fclose(f->f_fp);
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f->f_fp = NULL;
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}
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INCREF(None);
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return None;
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}
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static object *
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file_seek(f, args)
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fileobject *f;
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object *args;
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{
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long offset;
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long whence;
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if (f->f_fp == NULL) {
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err_badarg();
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return NULL;
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}
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if (args != NULL && is_intobject(args)) {
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offset = getintvalue(args);
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whence = 0; /* SEEK_SET */
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}
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else {
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if (!getlonglongargs(args, &offset, &whence))
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return NULL;
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}
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errno = 0;
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if (fseek(f->f_fp, offset, (int)whence) != 0) {
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if (errno == 0)
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errno = EIO;
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return err_errno(RuntimeError);
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}
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INCREF(None);
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return None;
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}
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static object *
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file_tell(f, args)
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fileobject *f;
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object *args;
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{
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long offset;
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if (args != NULL || f->f_fp == NULL) {
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err_badarg();
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return NULL;
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}
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errno = 0;
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offset = ftell(f->f_fp);
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if (offset == -1L) {
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if (errno == 0)
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errno = EIO;
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return err_errno(RuntimeError);
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}
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return newintobject(offset);
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}
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static object *
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file_flush(f, args)
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fileobject *f;
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object *args;
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{
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if (args != NULL || f->f_fp == NULL) {
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err_badarg();
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return NULL;
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}
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errno = 0;
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if (fflush(f->f_fp) != 0) {
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if (errno == 0)
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errno = EIO;
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return err_errno(RuntimeError);
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}
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INCREF(None);
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return None;
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}
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static object *
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file_read(f, args)
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fileobject *f;
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object *args;
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{
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int n, n1, n2, n3;
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object *v;
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if (f->f_fp == NULL) {
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err_badarg();
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return NULL;
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}
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if (args == 0)
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n = 0;
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else {
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if (!getintarg(args, &n))
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return NULL;
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if (n < 0) {
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err_badarg();
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return NULL;
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}
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}
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n2 = n != 0 ? n : BUFSIZ;
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v = newsizedstringobject((char *)NULL, n2);
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if (v == NULL)
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return NULL;
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n1 = 0;
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for (;;) {
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n3 = fread(BUF(v)+n1, 1, n2-n1, f->f_fp);
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/* XXX Error check? */
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if (n3 == 0)
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break;
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n1 += n3;
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if (n1 == n)
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break;
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if (n == 0) {
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n2 = n1 + BUFSIZ;
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if (resizestring(&v, n2) < 0)
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return NULL;
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}
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}
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if (n1 != n2)
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resizestring(&v, n1);
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return v;
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}
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/* Read a line.
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Without argument, or with a zero argument, read until end of line
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or EOF, whichever comes first.
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With a positive argument n, read at most n bytes until end of line
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or EOF, whichever comes first.
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Negative and non-integer arguments are illegal.
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When EOF is hit immediately, return an empty string.
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A newline character is returned as the last character of the buffer
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if it is read.
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*/
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/* XXX Should this be unified with raw_input()? */
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static object *
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file_readline(f, args)
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fileobject *f;
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object *args;
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{
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register FILE *fp;
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register int c;
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register char *buf, *end;
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int n, n1, n2;
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object *v;
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if ((fp = f->f_fp) == NULL) {
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err_badarg();
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return NULL;
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}
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if (args == NULL)
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n = 0; /* Unlimited */
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else {
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if (!getintarg(args, &n))
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return NULL;
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if (n < 0) {
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err_badarg();
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return NULL;
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}
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}
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n2 = n != 0 ? n : 100;
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v = newsizedstringobject((char *)NULL, n2);
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if (v == NULL)
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return NULL;
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buf = BUF(v);
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end = buf + n2;
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for (;;) {
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if ((c = getc(fp)) == EOF || (*buf++ = c) == '\n')
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break;
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/* XXX Error check? */
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if (buf == end) {
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if (n != 0)
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break;
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n1 = n2;
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n2 += 1000;
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if (resizestring(&v, n2) < 0)
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return NULL;
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buf = BUF(v) + n1;
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end = BUF(v) + n2;
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}
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}
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n1 = buf - BUF(v);
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if (n1 != n2)
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resizestring(&v, n1);
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return v;
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}
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static object *
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file_readlines(f, args)
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fileobject *f;
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object *args;
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{
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object *list;
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object *line;
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if ((list = newlistobject(0)) == NULL)
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return NULL;
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for (;;) {
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line = file_readline(f, args);
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if (line != NULL && getstringsize(line) == 0) {
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DECREF(line);
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break;
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}
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if (line == NULL || addlistitem(list, line) != 0) {
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DECREF(list);
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XDECREF(line);
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return NULL;
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}
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DECREF(line);
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}
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return list;
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}
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static object *
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file_write(f, args)
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fileobject *f;
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object *args;
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{
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int n, n2;
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if (f->f_fp == NULL) {
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err_badarg();
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return NULL;
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}
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if (args == NULL || !is_stringobject(args)) {
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err_badarg();
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return NULL;
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}
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errno = 0;
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n2 = fwrite(getstringvalue(args), 1, n = getstringsize(args), f->f_fp);
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if (n2 != n) {
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if (errno == 0)
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errno = EIO;
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err_errno(RuntimeError);
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return NULL;
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}
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INCREF(None);
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return None;
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}
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static struct methodlist file_methods[] = {
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{"close", file_close},
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{"flush", file_flush},
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{"read", file_read},
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{"readline", file_readline},
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{"readlines", file_readlines},
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{"seek", file_seek},
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{"tell", file_tell},
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{"write", file_write},
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{NULL, NULL} /* sentinel */
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};
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static object *
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file_getattr(f, name)
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fileobject *f;
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char *name;
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{
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return findmethod(file_methods, (object *)f, name);
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}
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typeobject Filetype = {
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OB_HEAD_INIT(&Typetype)
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0,
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"file",
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sizeof(fileobject),
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0,
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file_dealloc, /*tp_dealloc*/
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file_print, /*tp_print*/
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file_getattr, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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file_repr, /*tp_repr*/
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};
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