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From: Radical DOT NetSurfer AT unknown DOT addr
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Loading data in a single operation?!?
Date: Mon, 03 Dec 2001 17:13:09 -0500
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References: <1tbg0uom8q1u46t3eo26cgqv261mahoet4 AT 4ax DOT com> <3C0B7127 DOT 5080F19F AT eik DOT bme DOT hu>
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To: djgpp AT delorie DOT com
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I wish to thank you for the time you took to post this.
Nice work.

Thanks.

//RadSurfer//

I just need to put "trust" into using this new approach...
it was easy using embedded strings, just not very convenient
to switch between data without re-compiling using a different
name or something...
at least this approach leaves me with a single program,
and hopefully an endless supply of data files...
I also note that your approach did not use strtok that someone
else suggested...
fascinating... your code is the winner I believe ;-)

On Mon, 03 Dec 2001 13:33:43 +0100, "Dr.András Sólyom"
<solyom AT eik DOT bme DOT hu> wrote:

>Radical DOT NetSurfer AT delorie DOT com wrote:
>
>> Here's a toughy:
>>
>> Using conventional C-style code,
>> something I wish to be portable,
>> how would you load in data for a
>> two-dimensional string array...
>> dynamically allocated:
>>
>>
>
>.. code snippet cut
>
>>
>> HOW CAN I SIMPLY LOAD THE _entire_ FILE
>> INTO MEMORY in one swift operation ?
>> say, using    fread()   ???
>>
>> the string array in memory has the actual format
>> of:
>> char *StringArray1[i] = {
>>   "item1a", "item1b",
>>  "item2a", "item2b",
>>  etc.  etc.
>> };
>>
>> the sizes of each string is unique....
>> the size of the array may change the next time
>> the program runs,
>> any ideas?
>>
>
>Store 0 terminated strings  in the file! You than simple read in the the
>whole file with fread after
>allocating enough space for it (memory size will be 1 more than file
>size,determined by stat/fstat). Put a 0 into the last byte of the
>allocated buffer. Then run through these strings in memory to get the
>number of strings in it and allocate and fill up your array. You can
>determine where the array ends utililising the additional 0 you have put
>there: if the next string is empty then you have reached the end. Like:
>    char *p = buffer;  int count = 0; int i = 0;
>    while(*p) { ++count; p = p + strlen(p)+1; }
>   StringArray = (char**) calloc(count, sizeof(char*) );
>    while(*p) { StringArray[i] = p; ++i; p = p + strlen(p)+1; }
>
>    Andras