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Full Discussion: size of char array in c
Top Forums Programming size of char array in c Post 302141989 by porter on Tuesday 23rd of October 2007 08:47:53 PM
Old 10-23-2007
Two basic solutions

1. keep reading in 512 byte buffers and make a linked list of those buffers where the struct looks something like

struct buffer { struct buffer *next; long length; unsigned char data[512]; };

2. allocate a block using malloc of length 512 bytes and read into that, if you did not fill the buffer then read again in the remaining space
if you get a read of zero bytes then that is the end of stream indicator
else you still have more to read, reallocate the ptr with a size+=512, and go back to reading again.
 

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LEARN ABOUT PLAN9

dd

DD(1)							      General Commands Manual							     DD(1)

NAME

       dd - convert and copy a file

SYNOPSIS

       dd [ option value ] ...

DESCRIPTION

       Dd  copies  the specified input file to the specified output with possible conversions.	The standard input and output are used by default.
       The input and output block size may be specified to take advantage of raw physical I/O.	The options are

       -if f   Open file f for input.

       -of f   Open file f for output.

       -ibs n  Set input block size to n bytes (default 512).

       -obs n  Set output block size (default 512).

       -bs n   Set both input and output block size, superseding ibs and obs.  If no conversion  is  specified,  preserve  the	input  block  size
	       instead of packing short blocks into the output buffer.	This is particularly efficient since no in-core copy need be done.

       -cbs n  Set conversion buffer size.

       -skip n Skip n input records before copying.

       -iseek n
	       Seek n records forward on input file before copying.

       -files n
	       Catenate n input files (useful only for magnetic tape or similar input device).

       -oseek n
	       Seek n records from beginning of output file before copying.

       -count n
	       Copy only n input records.

       -conv ascii    Convert EBCDIC to ASCII.

	    ebcdic   Convert ASCII to EBCDIC.

	    ibm      Like ebcdic but with a slightly different character map.

	    block    Convert variable length ASCII records to fixed length.

	    unblock  Convert fixed length ASCII records to variable length.

	    lcase    Map alphabetics to lower case.

	    ucase    Map alphabetics to upper case.

	    swab     Swap every pair of bytes.

	    noerror  Do not stop processing on an error.

	    sync     Pad every input record to ibs bytes.

       Where  sizes are specified, a number of bytes is expected.  A number may end with or to specify multiplication by 1024 or 512 respectively;
       a pair of numbers may be separated by to indicate a product.  Multiple conversions may be specified in the style:

       is used only if or conversion is specified.  In the first two cases, n characters are copied into  the  conversion  buffer,  any  specified
       character  mapping  is  done, trailing blanks are trimmed and new-line is added before sending the line to the output.  In the latter three
       cases, characters are read into the conversion buffer and blanks are added to make up an output record of size n.   If  is  unspecified	or
       zero,  the  and	options  convert the character set without changing the block structure of the input file; the and options become a simple
       file copy.

SOURCE

       /sys/src/cmd/dd.c

SEE ALSO

       cp(1)

DIAGNOSTICS

       Dd reports the number of full + partial input and output blocks handled.

																	     DD(1)
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