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

#define TMP ".###tmp_file"
#define MAX 10240
char c='\n';

int main(int argc,char *argv[])
{
    char buffer[MAX];
    char sortie[2*MAX];
    char *file;
    int p;
    register int i,lu,d;
   
    if(argc < 2)
    {
        printf("usage : %s liste de fichiers\n",argv[0]);
        return 1;
    }
    close(0);close(1);
    for(p=1;p<argc;)
    {
        file = argv[p++];

        if(open(file,O_RDONLY) != 0)
        {
            fprintf(stderr,"%s : fichier %s inaccessible\n",argv[0],file);
            exit(2);
        }
        if(open(TMP,O_WRONLY|O_CREAT,0600) != 1)
        {
            fprintf(stderr,"%s : ouverture du fichier temporaire %s impossible\n",argv[0],TMP);
            exit(3);
        }

        for(;;)
        {
            lu=read(0,buffer,MAX);
            if(lu <= 0)
                break;
            for(i=0,d=0;i<lu;i++)
                if(buffer[i] == c)
                {
                    sortie[i+d]='\r';
                    d++;
                    sortie[i+d]=buffer[i];
                }
                else
                    sortie[i+d]=buffer[i];
            write(1,sortie,lu+d);
        }
        close(1);close(0);
        sprintf(buffer,"rm %s ; mv %s %s",file,TMP,file);
        system(buffer);
    }
    return 0;
}