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Title "BIO_S_FILE 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 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 Header "DESCRIPTION" \fBBIO_s_file() 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

Calls to BIO_read_ex() and BIO_write_ex() read and write data to the underlying stream. BIO_gets() and BIO_puts() are supported on file BIOs.

\fBBIO_flush() on a file \s-1BIO\s0 calls the fflush() function on the wrapped stream.

\fBBIO_reset() attempts to change the file pointer to the start of file using fseek(stream, 0, 0).

\fBBIO_seek() sets the file pointer to position ofs from start of file using fseek(stream, ofs, 0).

\fBBIO_eof() calls feof().

Setting the \s-1BIO_CLOSE\s0 flag calls fclose() on the stream when the \s-1BIO\s0 is freed.

\fBBIO_new_file() creates a new file \s-1BIO\s0 with mode mode the meaning of mode is the same as the stdio function fopen(). The \s-1BIO_CLOSE\s0 flag is set on the returned \s-1BIO.\s0

\fBBIO_new_fp() creates a file \s-1BIO\s0 wrapping stream. 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).

\fBBIO_set_fp() sets the fp of a file \s-1BIO\s0 to fp. flags has the same meaning as in BIO_new_fp(), it is a macro.

\fBBIO_get_fp() retrieves the fp of a file \s-1BIO,\s0 it is a macro.

\fBBIO_seek() is a macro that sets the position pointer to offset bytes from the start of file.

\fBBIO_tell() returns the value of the position pointer.

\fBBIO_read_filename(), BIO_write_filename(), BIO_append_filename() and \fBBIO_rw_filename() set the file \s-1BIO\s0 b to use file name for reading, writing, append or read write respectively.

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.

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

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

Header "RETURN VALUES" \fBBIO_s_file() returns the file \s-1BIO\s0 method.

\fBBIO_new_file() and BIO_new_fp() return a file \s-1BIO\s0 or \s-1NULL\s0 if an error occurred.

\fBBIO_set_fp() and BIO_get_fp() return 1 for success or <=0 for failure (although the current implementation never return 0).

\fBBIO_seek() returns 0 for success or negative values for failure.

\fBBIO_tell() returns the current file position or negative values for failure.

\fBBIO_read_filename(), BIO_write_filename(), BIO_append_filename() and \fBBIO_rw_filename() return 1 for success or <=0 for failure.

Header "EXAMPLES" File \s-1BIO\s0 \*(L"hello world\*(R":

.Vb 1 BIO *bio_out; \& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE); BIO_printf(bio_out, "Hello World\en"); .Ve

Alternative technique:

.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) <= 0) /* Error */ BIO_printf(bio_out, "Hello World\en"); .Ve

Write to a file:

.Vb 1 BIO *out; \& out = BIO_new_file("filename.txt", "w"); if (!out) /* Error */ BIO_printf(out, "Hello World\en"); BIO_free(out); .Ve

Alternative technique:

.Vb 1 BIO *out; \& out = BIO_new(BIO_s_file()); if (out == NULL) /* Error */ if (BIO_write_filename(out, "filename.txt") <= 0) /* Error */ BIO_printf(out, "Hello World\en"); BIO_free(out); .Ve

Header "BUGS" \fBBIO_reset() and BIO_seek() are implemented using fseek() on the underlying stream. The return value for fseek() 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. Header "SEE ALSO" \fBBIO_seek\|(3), BIO_tell\|(3), \fBBIO_reset\|(3), BIO_flush\|(3), \fBBIO_read_ex\|(3), \fBBIO_write_ex\|(3), BIO_puts\|(3), \fBBIO_gets\|(3), BIO_printf\|(3), \fBBIO_set_close\|(3), BIO_get_close\|(3) Header "COPYRIGHT" Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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>.