BIO_new_fp man page on DigitalUNIX

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BIO_s_file(3)							 BIO_s_file(3)

       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

       #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 );

       The  BIO_s_file()  function  returns  the BIO file method.  As its name
       implies it is a wrapper round the stdio FILE  structure	and  it	 is  a
       source/sink BIO.

       Calls to BIO_read() and BIO_write() read and write data to the underly‐
       ing stream.  BIO_gets() and BIO_puts() are supported on file BIOs.

       BIO_flush() on a file BIO calls the fflush() function  on  the  wrapped

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

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

       BIO_eof() calls feof().

       Setting the BIO_CLOSE flag calls fclose() on the stream when the BIO is

       BIO_new_file() creates a new file BIO with mode	mode  the  meaning  of
       mode  is	 the same as the stdio function fopen(). The BIO_CLOSE flag is
       set on the returned BIO.

       BIO_new_fp()  creates  a	 file  BIO  wrapping  stream.  Flags  can  be:
       BIO_CLOSE,  BIO_NOCLOSE (the close flag) BIO_FP_TEXT (sets the underly‐
       ing stream to text mode, default is binary: this only  has  any	effect
       under Win32).

       BIO_set_fp() sets the fp of a file BIO to fp.  flags has the same mean‐
       ing as in BIO_new_fp(), it is a macro.

       BIO_get_fp() retrieves the fp of a file BIO, it is a macro.

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

       BIO_tell() returns the value of the position pointer.

       BIO_read_filename(),  BIO_write_filename(),  BIO_append_filename(), and
       BIO_rw_filename() set the file BIO b to	use  file  name	 for  reading,
       writing, append or read write respectively.

       When  wrapping stdout, stdin or stderr the underlying stream should not
       normally be closed. So the BIO_NOCLOSE flag should be set.

       Because the file BIO calls the underlying stdio functions,  any	quirks
       in stdio behavior will be mirrored by the corresponding BIO.

       BIO_reset()  and BIO_seek() are implemented using fseek() on the under‐
       lying stream. The return value for fseek() is 0 for success or -1 if an
       error  occurred	this  differs from other types of BIO which will typi‐
       cally return 1  for  success  and  a  nonpositive  value	 if  an	 error

       BIO_s_file() returns the file BIO method.

       BIO_new_file()  and  BIO_new_fp() return a file BIO or NULL if an error

       BIO_set_fp() and BIO_get_fp() return 1 for success  or  0  for  failure
       (although the current implementation never returns 0).

       BIO_seek() returns the same value as the underlying fseek() function: 0
       for success or -1 for failure.

       BIO_tell() returns the current file position.

       BIO_read_filename(), BIO_write_filename(),  BIO_append_filename(),  and
       BIO_rw_filename() return 1 for success or 0 for failure.

       File  BIO  "hello  world":  BIO	*bio_out; bio_out = BIO_new_fp(stdout,
       BIO_NOCLOSE); BIO_printf(bio_out, "Hello World\n");

       Alternative technique: 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\n");

       Write to a file: BIO *out;  out	=  BIO_new_file("filename.txt",	 "w");
       if(!out)	  /*  Error  occurred  */  BIO_printf(out,  "Hello  World\n");

       Alternative technique: 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\n"); BIO_free(out);

       Functions:  BIO_seek(3),	  BIO_tell(3),	 BIO_reset(3),	 BIO_flush(3),
       BIO_read(3),  BIO_write(3),  BIO_puts(3),  BIO_gets(3),	BIO_printf(3),
       BIO_set_close(3), BIO_get_close(3)


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