11-02-2010
Corona688,
I never said I needed to "write to a const array" as you put it.
"How do I now initialize the const arrays using fread()?"
Initialize is the word I used. All real data must be initialized, including "const" read-only data, but after that initialization, I need the program to treat the freshly initialized data, dynamically allocated from the heap, as an immutable read only construct.
Let me rephrase my question:
How do I make sure that a dynamically allocated array is treated as an immutable structure, which is always stored in CPU cache? I am indifferent about using the word "const".
Should I simply just assume that the compiler can figure out when an array only ever gets written to once? But that doesn't sound very scientific. I am not programming computers to be a dweeb, but rather a scientist, in a tradition akin to the great John von Neumann.
I do not need your help on how to use fread(), for it is well documented. I need you to take a look at the link I provided with an example of my previous work, before you say something else that makes you look like a "daydream Johnny."
Explain to me why anybody would store 9 unsigned shorts in a file. Your example demonstrates a less than thorough investigation of my post.
All the very best,
JohnPaul Adamovsky
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LEARN ABOUT OPENSOLARIS
fread
fread(3C) Standard C Library Functions fread(3C)
NAME
fread - binary input
SYNOPSIS
#include <stdio.h>
size_t fread(void *ptr, size_t size, size_t nitems, FILE *stream);
DESCRIPTION
The fread() function reads into the array pointed to by ptr up to nitems elements whose size is specified by size in bytes, from the stream
pointed to by stream. For each object, size calls are made to the fgetc(3C) function and the results stored, in the order read, in an array
of unsigned char exactly overlaying the object. The file-position indicator for the stream (if defined) is advanced by the number of bytes
successfully read. If an error occurs, the resulting value of the file-position indicator for the stream is unspecified. If a partial ele-
ment is read, its value is unspecified.
The fread() function may mark the st_atime field of the file associated with stream for update. The st_atime field will be marked for
update by the first successful execution of fgetc(3C), fgets(3C), fgetwc(3C), fgetws(3C), fread(), fscanf(3C), getc(3C), getchar(3C),
gets(3C), or scanf(3C) using stream that returns data not supplied by a prior call to ungetc(3C) or ungetwc(3C).
RETURN VALUES
Upon successful completion, fread() returns the number of elements successfully read, which is less than nitems only if a read error or
end-of-file is encountered. If size or nitems is 0, fread() returns 0 and the contents of the array and the state of the stream remain
unchanged. Otherwise, if a read error occurs, the error indicator for the stream is set and errno is set to indicate the error.
ERRORS
Refer to fgetc(3C).
EXAMPLES
Example 1 Reading from a Stream
The following example reads a single element from the fp stream into the array pointed to by buf.
#include <stdio.h>
...
size_t bytes_read;
char buf[100];
FILE *fp;
...
bytes_read = fread(buf, sizeof(buf), 1, fp);
...
USAGE
The ferror() or feof() functions must be used to distinguish between an error condition and end-of-file condition. See ferror(3C).
Because of possible differences in element length and byte ordering, files written using fwrite(3C) are application-dependent, and possibly
cannot be read using fread() by a different application or by the same application on a different processor.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
read(2), fclose(3C), ferror(3C), fopen(3C), getc(3C), gets(3C), printf(3C), putc(3C), puts(3C), attributes(5), standards(5)
SunOS 5.11 24 Jul 2002 fread(3C)