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Full Discussion: Merge files from /etc to one file using C
Top Forums Programming Merge files from /etc to one file using C Post 302432733 by sussil on Saturday 26th of June 2010 10:45:19 AM
Old 06-26-2010
MySQL
So if anyone is interested about how it can be done, this works (more or less) but of course the code could be optimized.

Code:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>

void listar(char *dir);

int main(int argc, char *argv[]){
	int dscr1, dscr2, i;
	char Buffer[512];
	dscr2 = creat("file.txt", 0666);
	DIR *d;
	struct dirent *ent;
	struct stat inode;
	if((d = opendir("/etc")) == NULL){
		printf("Couldn't open");
		perror("\etc");
		exit(1);
	}
	printf("\n");
	chdir("/etc");
	while(ent = readdir(d)){
		if((strncmp(".", ent->d_name) != 0) && (strncmp("..", ent->d_name) != 0)){
			lstat(ent->d_name, &inode);
			if(S_ISREG(inode.st_mode)){
				printf("%s\n", ent->d_name);
				if((dscr1 = open(ent->d_name, O_RDONLY)) == -1){
			                perror("ERROR");
					close(dscr1);
			                continue;
			        }
			        while (read(dscr1, &Buffer, 512)){
			                write(dscr2, Buffer, sizeof(Buffer));
			        }
				for(i = 0; i < 512; i++){
					Buffer[i] = ' ';
                                }
				close(dscr1);
			}
		}
	}
	printf("\n");
        close(dscr2);

	return 0;
}

 

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LEARN ABOUT DEBIAN

merge-info

MERGE-INFO(1)						       XStow Reference Guide						     MERGE-INFO(1)

NAME

       merge-info, merge and unmerge GNU Info index files

SYNOPSIS

       merge-info	 [OPTION ...] FILE FILE

DESCRIPTION

       merge-info can merge and unmerge the GNU Info index files named 'dir'. These files are usally created by install-info at install time of an
       application, or automatically generated by a mkinfodir script.

       If you are installing 2 packages at two different locations, two different 'dir' files are created. Eg.: One in

		 /stow/foo/usr/local/info/dir

       and one in

		 /stow/bar/usr/local/info/dir

       This is the common case if you are using a tool like xstow(1). merge-info can handle this and can merge both 'dir' files and creates a new
       'dir' file.

USAGE

       merge-info [OPTION ...] FILE FILE

       Merge two files:

	     merge-info /stow/foo/info/dir /stow/bar/info/dir

       Remove the content of a 'dir' file from another 'dir' file

	      merge-info -u /stow/foo/info/dir /stow/bar/info/dir

OPTIONS

       -dl -debug-level INT
	   Set's the debug level. An unsigned integer is accepted. The default value is 0.

       -h -help
	   Shows a help screen.

       -V -Version
	   Displays the verion number of the XStow package. merge-info is shipped with xstow(1).

       -u -unmerge
	   Unmerge instead of merge. Note: It is not possible splitting up one 'dir' file into two. But removing the content of one 'dir' file
	   from the other one is possible.

       -o -outfile
	   Write the resulting 'dir' file not to stdout. Write it to a given file. Since merge-info does not open this outfile until all the
	   merging or unmerging stuff is done it is allowed that the outfile is one the source files. eg.:

	       merge-info -u foo/info/dir bar/info/dir -o foo/info/dir

       -d -duplicate
	   Remove duplicate entries. When merging 2 files an entry can appear in more than one section. If you do not wan't this, use this option.

ENVIRONMENT VARIABLES

       XSTOW_DEBUG_LEVEL
	   Same as the -debug-level option.

AUTHORS

       merge-info was written by Martin Oberzalek <kingleo@gmx.at>.

COPYING

       merge-info, a tool for merging GNU Info index files.

       Copyright (C) 2004-2005 by Martin Oberzalek <kingleo@gmx.at>

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
       Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

SEE ALSO

       info(1) install-info(1) xstow(1)

XStow 1.0.0							    2012-05-29							     MERGE-INFO(1)
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