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Edit File : BIO_new_file.3ssl \| Size : 9.06 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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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> \& \& 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" \&\fBBIO_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 \fBBIO_read()\fR and \fBBIO_write()\fR read and write data to the underlying stream. \fBBIO_gets()\fR and \fBBIO_puts()\fR are supported on file BIOs. .PP \&\fBBIO_flush()\fR on a file \s-1BIO\s0 calls the \fBfflush()\fR function on the wrapped stream. .PP \&\fBBIO_reset()\fR attempts to change the file pointer to the start of file using fseek(stream, 0, 0). .PP \&\fBBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file using fseek(stream, ofs, 0). .PP \&\fBBIO_eof()\fR calls \fBfeof()\fR. .PP Setting the \s-1BIO_CLOSE\s0 flag calls \fBfclose()\fR on the stream when the \s-1BIO\s0 is freed. .PP \&\fBBIO_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 \fBfopen()\fR. The \s-1BIO_CLOSE\s0 flag is set on the returned \s-1BIO.\s0 .PP \&\fBBIO_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 \&\fBBIO_set_fp()\fR set the fp of a file \s-1BIO\s0 to \fBfp\fR. \fBflags\fR has the same meaning as in \fBBIO_new_fp()\fR, it is a macro. .PP \&\fBBIO_get_fp()\fR retrieves the fp of a file \s-1BIO,\s0 it is a macro. .PP \&\fBBIO_seek()\fR is a macro that sets the position pointer to \fBoffset\fR bytes from the start of file. .PP \&\fBBIO_tell()\fR returns the value of the position pointer. .PP \&\fBBIO_read_filename()\fR, \fBBIO_write_filename()\fR, \fBBIO_append_filename()\fR and \&\fBBIO_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 file names in \s-1UTF\-8.\s0 .SH "EXAMPLES" .IX Header "EXAMPLES" File \s-1BIO\s0 \(L"hello world\(R": .PP .Vb 3 \& BIO bio_out; \& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE); \& BIO_printf(bio_out, "Hello World\en"); .Ve .PP Alternative technique: .PP .Vb 5 \& 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 5 \& BIO out; \& out = BIO_new_file("filename.txt", "w"); \& if(!out) /* Error occurred / \& BIO_printf(out, "Hello World\en"); \& BIO_free(out); .Ve .PP Alternative technique: .PP .Vb 6 \& 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 "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_s_file()\fR returns the file \s-1BIO\s0 method. .PP \&\fBBIO_new_file()\fR and \fBBIO_new_fp()\fR return a file \s-1BIO\s0 or \s-1NULL\s0 if an error occurred. .PP \&\fBBIO_set_fp()\fR and \fBBIO_get_fp()\fR return 1 for success or 0 for failure (although the current implementation never return 0). .PP \&\fBBIO_seek()\fR returns the same value as the underlying \fBfseek()\fR function: 0 for success or \-1 for failure. .PP \&\fBBIO_tell()\fR returns the current file position. .PP \&\fBBIO_read_filename()\fR, \fBBIO_write_filename()\fR, \fBBIO_append_filename()\fR and \&\fBBIO_rw_filename()\fR return 1 for success or 0 for failure. .SH "BUGS" .IX Header "BUGS" \&\fBBIO_reset()\fR and \fBBIO_seek()\fR are implemented using \fBfseek()\fR on the underlying stream. The return value for \fBfseek()\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" \&\fBBIO_seek\fR\\|(3), \fBBIO_tell\fR\\|(3), \&\fBBIO_reset\fR\\|(3), \fBBIO_flush\fR\\|(3), \&\fBBIO_read\fR\\|(3), \&\fBBIO_write\fR\\|(3), \fBBIO_puts\fR\\|(3), \&\fBBIO_gets\fR\\|(3), \fBBIO_printf\fR\\|(3), \&\fBBIO_set_close\fR\\|(3), \fBBIO_get_close\fR\\|(3) Back

Edit File : BIO_new_file.3ssl | Size : 9.06 KB

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.\" ========================================================================
.\"
.IX Title "BIO_s_file 3"
.TH BIO_s_file 3 "2019-12-20" "1.0.2u" "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>
\&
\& 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"
\&\fBBIO_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 \fBBIO_read()\fR and \fBBIO_write()\fR read and write data to the
underlying stream. \fBBIO_gets()\fR and \fBBIO_puts()\fR are supported on file BIOs.
.PP
\&\fBBIO_flush()\fR on a file \s-1BIO\s0 calls the \fBfflush()\fR function on the wrapped
stream.
.PP
\&\fBBIO_reset()\fR attempts to change the file pointer to the start of file
using fseek(stream, 0, 0).
.PP
\&\fBBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file
using fseek(stream, ofs, 0).
.PP
\&\fBBIO_eof()\fR calls \fBfeof()\fR.
.PP
Setting the \s-1BIO_CLOSE\s0 flag calls \fBfclose()\fR on the stream when the \s-1BIO\s0
is freed.
.PP
\&\fBBIO_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 \fBfopen()\fR. The \s-1BIO_CLOSE\s0
flag is set on the returned \s-1BIO.\s0
.PP
\&\fBBIO_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
\&\fBBIO_set_fp()\fR set the fp of a file \s-1BIO\s0 to \fBfp\fR. \fBflags\fR has the same
meaning as in \fBBIO_new_fp()\fR, it is a macro.
.PP
\&\fBBIO_get_fp()\fR retrieves the fp of a file \s-1BIO,\s0 it is a macro.
.PP
\&\fBBIO_seek()\fR is a macro that sets the position pointer to \fBoffset\fR bytes
from the start of file.
.PP
\&\fBBIO_tell()\fR returns the value of the position pointer.
.PP
\&\fBBIO_read_filename()\fR, \fBBIO_write_filename()\fR, \fBBIO_append_filename()\fR and
\&\fBBIO_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 file names in \s-1UTF\-8.\s0
.SH "EXAMPLES"
.IX Header "EXAMPLES"
File \s-1BIO\s0 \*(L"hello world\*(R":
.PP
.Vb 3
\& BIO *bio_out;
\& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
\& BIO_printf(bio_out, "Hello World\en");
.Ve
.PP
Alternative technique:
.PP
.Vb 5
\& 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 5
\& BIO *out;
\& out = BIO_new_file("filename.txt", "w");
\& if(!out) /* Error occurred */
\& BIO_printf(out, "Hello World\en");
\& BIO_free(out);
.Ve
.PP
Alternative technique:
.PP
.Vb 6
\& 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 "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_s_file()\fR returns the file \s-1BIO\s0 method.
.PP
\&\fBBIO_new_file()\fR and \fBBIO_new_fp()\fR return a file \s-1BIO\s0 or \s-1NULL\s0 if an error
occurred.
.PP
\&\fBBIO_set_fp()\fR and \fBBIO_get_fp()\fR return 1 for success or 0 for failure
(although the current implementation never return 0).
.PP
\&\fBBIO_seek()\fR returns the same value as the underlying \fBfseek()\fR function:
0 for success or \-1 for failure.
.PP
\&\fBBIO_tell()\fR returns the current file position.
.PP
\&\fBBIO_read_filename()\fR, \fBBIO_write_filename()\fR,  \fBBIO_append_filename()\fR and
\&\fBBIO_rw_filename()\fR return 1 for success or 0 for failure.
.SH "BUGS"
.IX Header "BUGS"
\&\fBBIO_reset()\fR and \fBBIO_seek()\fR are implemented using \fBfseek()\fR on the underlying
stream. The return value for \fBfseek()\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"
\&\fBBIO_seek\fR\|(3), \fBBIO_tell\fR\|(3),
\&\fBBIO_reset\fR\|(3), \fBBIO_flush\fR\|(3),
\&\fBBIO_read\fR\|(3),
\&\fBBIO_write\fR\|(3), \fBBIO_puts\fR\|(3),
\&\fBBIO_gets\fR\|(3), \fBBIO_printf\fR\|(3),
\&\fBBIO_set_close\fR\|(3), \fBBIO_get_close\fR\|(3)

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