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Date:      Fri, 1 Aug 2014 02:00:24 +0200
From:      Polytropon <freebsd@edvax.de>
To:        Gary Kline <kline@thought.org>
Cc:        FreeBSD Mailing List <freebsd-questions@FreeBSD.ORG>
Subject:   Re: how to grab text w/ fcanf
Message-ID:  <20140801020024.bf03b2d3.freebsd@edvax.de>
In-Reply-To: <20140731233335.GA24151@ethic.thought.org>
References:  <20140731233335.GA24151@ethic.thought.org>

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On Thu, 31 Jul 2014 16:33:35 -0700, Gary Kline wrote:
> 	I've got a *.c file that returns in [let's say]
> 
> 		/tmp/share/voice
> 
> 	a bunch of files named:  "text.1.txt", "text.2.txt",
> 	"text.3.txt" ... text.N-1.txt", each file containing a few
> 	sentences of plain ol' ASCII or [whatever] text.
> 
> 	what is the easiest way, in C, *knowing the count=N*, to
> 	grab the *text files and stuff the paragraphs into a global
> 	buffer:	char *parabuffer[1024]; ??

I think scandir() is what you're searching for, in combination
with alphasort() to get the "natural" ordering of the files.
Plain C.

Example code:

	#include <dirent.h>
	#include <stdio.h>
	#include <stdlib.h>
	...
	struct dirent **namelist;
	int i,n;


	    n = scandir(".", &namelist, 0, alphasort);
	    if (n < 0)
	        perror("scandir");
	    else {
	        for (i = 0; i < n; i++) {
	            printf("%s\n", namelist[i]->d_name);
	            free(namelist[i]);
	            }
	        }
	    free(namelist);
	...

Source for example:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/alphasort.html

You can iterate over namelist[] and access the d_name structure
member for the file name, and then use string operations like
strlcmp() or strnstr() to check for desired entries (given a
file mask, such as "test.*.txt", as a pattern).

See "man scandir" for details. Maybe consider readdir(),
see "man readdir" which contains the following example:

	len = strlen(name);
	dirp = opendir(".");
	while ((dp = readdir(dirp)) != NULL)
		if (dp->d_namlen == len && !strcmp(dp->d_name, name)) {
			(void)closedir(dirp);
			return FOUND;
		}
	(void)closedir(dirp);
	return NOT_FOUND;

If this is too complicated, you could do the following, but
know that it's quick and _very_ dirty: sprintf() the filenames
with a counter N in the _known_ (!) pattern and test if the
files do exist, with fopen(); if fopen() fails, you know
that no further files will follow, you decrease the counter
by 1 and have the last valid index. :-)

As I initially said, this is quite low level C. Maybe you can
see something more elegant in the Gtk 3 documentation? But if
it has to be C, the suggested solutions are possible.


-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...



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