reopen(...)
public
Reassociates ios with the I/O stream given in other_IO or to a new stream opened on path. This may
dynamically change the actual class of this stream.
f1 = File.new("testfile")
f2 = File.new("testfile")
f2.readlines[0]
f2.reopen(f1)
f2.readlines[0]
Show source
/*
* call-seq:
* ios.reopen(other_IO) => ios
* ios.reopen(path, mode_str) => ios
*
* Reassociates <em>ios</em> with the I/O stream given in
* <i>other_IO</i> or to a new stream opened on <i>path</i>. This may
* dynamically change the actual class of this stream.
*
* f1 = File.new("testfile")
* f2 = File.new("testfile")
* f2.readlines[0]
* f2.reopen(f1)
* f2.readlines[0]
*/
static VALUE
rb_io_reopen(argc, argv, file)
int argc;
VALUE *argv;
VALUE file;
{
VALUE fname, nmode;
char *mode;
OpenFile *fptr;
rb_secure(4);
if (rb_scan_args(argc, argv, "11", &fname, &nmode) == 1) {
VALUE tmp = rb_io_check_io(fname);
if (!NIL_P(tmp)) {
return io_reopen(file, tmp);
}
}
SafeStringValue(fname);
rb_io_taint_check(file);
fptr = RFILE(file)->fptr;
if (!fptr) {
fptr = RFILE(file)->fptr = ALLOC(OpenFile);
MEMZERO(fptr, OpenFile, 1);
}
if (!NIL_P(nmode)) {
fptr->mode = rb_io_mode_flags(StringValueCStr(nmode));
}
if (fptr->path) {
free(fptr->path);
fptr->path = 0;
}
fptr->path = strdup(StringValueCStr(fname));
mode = rb_io_flags_mode(fptr->mode);
if (!fptr->f) {
fptr->f = rb_fopen(fptr->path, mode);
if (fptr->f2) {
fclose(fptr->f2);
fptr->f2 = 0;
}
return file;
}
if (freopen(fptr->path, mode, fptr->f) == 0) {
rb_sys_fail(fptr->path);
}
#ifdef USE_SETVBUF
if (setvbuf(fptr->f, NULL, _IOFBF, 0) != 0)
rb_warn("setvbuf() can't be honoured for %s", fptr->path);
#endif
if (fptr->f2) {
if (freopen(fptr->path, "w", fptr->f2) == 0) {
rb_sys_fail(fptr->path);
}
}
return file;
}