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.\" ========================================================================
.\"
.IX Title "BIO_S_FILE 3"
.TH BIO_S_FILE 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
BIO_s_file, BIO_new_file, BIO_new_fp, BIO_set_fp, BIO_get_fp, BIO_read_filename, BIO_write_filename, BIO_append_filename, BIO_rw_filename \- FILE bio
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bio.h>
\&
\& const BIO_METHOD *BIO_s_file(void);
\& BIO *BIO_new_file(const char *filename, const char *mode);
\& BIO *BIO_new_fp(FILE *stream, int flags);
\&
\& BIO_set_fp(BIO *b, FILE *fp, int flags);
\& BIO_get_fp(BIO *b, FILE **fpp);
\&
\& int BIO_read_filename(BIO *b, char *name)
\& int BIO_write_filename(BIO *b, char *name)
\& int BIO_append_filename(BIO *b, char *name)
\& int BIO_rw_filename(BIO *b, char *name)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIBIO_s_file()\fR returns the \s-1BIO\s0 file method. As its name implies it
is a wrapper round the stdio \s-1FILE\s0 structure and it is a
source/sink \s-1BIO.\s0
.PP
Calls to \fIBIO_read_ex()\fR and \fIBIO_write_ex()\fR read and write data to the
underlying stream. \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported on file BIOs.
.PP
\&\fIBIO_flush()\fR on a file \s-1BIO\s0 calls the \fIfflush()\fR function on the wrapped
stream.
.PP
\&\fIBIO_reset()\fR attempts to change the file pointer to the start of file
using fseek(stream, 0, 0).
.PP
\&\fIBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file
using fseek(stream, ofs, 0).
.PP
\&\fIBIO_eof()\fR calls \fIfeof()\fR.
.PP
Setting the \s-1BIO_CLOSE\s0 flag calls \fIfclose()\fR on the stream when the \s-1BIO\s0
is freed.
.PP
\&\fIBIO_new_file()\fR creates a new file \s-1BIO\s0 with mode \fBmode\fR the meaning
of \fBmode\fR is the same as the stdio function \fIfopen()\fR. The \s-1BIO_CLOSE\s0
flag is set on the returned \s-1BIO.\s0
.PP
\&\fIBIO_new_fp()\fR creates a file \s-1BIO\s0 wrapping \fBstream\fR. Flags can be:
\&\s-1BIO_CLOSE, BIO_NOCLOSE \s0(the close flag) \s-1BIO_FP_TEXT \s0(sets the underlying
stream to text mode, default is binary: this only has any effect under
Win32).
.PP
\&\fIBIO_set_fp()\fR sets the fp of a file \s-1BIO\s0 to \fBfp\fR. \fBflags\fR has the same
meaning as in \fIBIO_new_fp()\fR, it is a macro.
.PP
\&\fIBIO_get_fp()\fR retrieves the fp of a file \s-1BIO,\s0 it is a macro.
.PP
\&\fIBIO_seek()\fR is a macro that sets the position pointer to \fBoffset\fR bytes
from the start of file.
.PP
\&\fIBIO_tell()\fR returns the value of the position pointer.
.PP
\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
\&\fIBIO_rw_filename()\fR set the file \s-1BIO \s0\fBb\fR to use file \fBname\fR for
reading, writing, append or read write respectively.
.SH "NOTES"
.IX Header "NOTES"
When wrapping stdout, stdin or stderr the underlying stream should not
normally be closed so the \s-1BIO_NOCLOSE\s0 flag should be set.
.PP
Because the file \s-1BIO\s0 calls the underlying stdio functions any quirks
in stdio behaviour will be mirrored by the corresponding \s-1BIO.\s0
.PP
On Windows BIO_new_files reserves for the filename argument to be
\&\s-1UTF\-8\s0 encoded. In other words if you have to make it work in multi\-
lingual environment, encode filenames in \s-1UTF\-8.\s0
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIBIO_s_file()\fR returns the file \s-1BIO\s0 method.
.PP
\&\fIBIO_new_file()\fR and \fIBIO_new_fp()\fR return a file \s-1BIO\s0 or \s-1NULL\s0 if an error
occurred.
.PP
\&\fIBIO_set_fp()\fR and \fIBIO_get_fp()\fR return 1 for success or 0 for failure
(although the current implementation never return 0).
.PP
\&\fIBIO_seek()\fR returns the same value as the underlying \fIfseek()\fR function:
0 for success or \-1 for failure.
.PP
\&\fIBIO_tell()\fR returns the current file position.
.PP
\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
\&\fIBIO_rw_filename()\fR return 1 for success or 0 for failure.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
File \s-1BIO \s0\*(L"hello world\*(R":
.PP
.Vb 1
\& BIO *bio_out;
\&
\& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
\& BIO_printf(bio_out, "Hello World\en");
.Ve
.PP
Alternative technique:
.PP
.Vb 1
\& BIO *bio_out;
\&
\& bio_out = BIO_new(BIO_s_file());
\& if (bio_out == NULL)
\&     /* Error */
\& if (!BIO_set_fp(bio_out, stdout, BIO_NOCLOSE))
\&     /* Error */
\& BIO_printf(bio_out, "Hello World\en");
.Ve
.PP
Write to a file:
.PP
.Vb 1
\& BIO *out;
\&
\& out = BIO_new_file("filename.txt", "w");
\& if (!out)
\&     /* Error */
\& BIO_printf(out, "Hello World\en");
\& BIO_free(out);
.Ve
.PP
Alternative technique:
.PP
.Vb 1
\& BIO *out;
\&
\& out = BIO_new(BIO_s_file());
\& if (out == NULL)
\&     /* Error */
\& if (!BIO_write_filename(out, "filename.txt"))
\&     /* Error */
\& BIO_printf(out, "Hello World\en");
\& BIO_free(out);
.Ve
.SH "BUGS"
.IX Header "BUGS"
\&\fIBIO_reset()\fR and \fIBIO_seek()\fR are implemented using \fIfseek()\fR on the underlying
stream. The return value for \fIfseek()\fR is 0 for success or \-1 if an error
occurred this differs from other types of \s-1BIO\s0 which will typically return
1 for success and a non positive value if an error occurred.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIBIO_seek\fR\|(3), \fIBIO_tell\fR\|(3),
\&\fIBIO_reset\fR\|(3), \fIBIO_flush\fR\|(3),
\&\fIBIO_read_ex\fR\|(3),
\&\fIBIO_write_ex\fR\|(3), \fIBIO_puts\fR\|(3),
\&\fIBIO_gets\fR\|(3), \fIBIO_printf\fR\|(3),
\&\fIBIO_set_close\fR\|(3), \fIBIO_get_close\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
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