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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>

#define MAX_SIZE 1024

int main(int argc, char **argv)
{
int i;

if(argc < 3)
{
printf("Usage : %s <filename1> <filename2> <filename3>\n", argv[0]);
printf("or\nUsage : %s <filename1> <filename2> ... <directory name>\n", argv[0]);
}

const char *dir = argv[argc-1];
DIR *isdir = opendir(dir);

if(isdir)
{
for(i=1; i < argc - 1; i++)
{
if(access(argv[i], F_OK) != -1)
{
int len = strlen(dir) + strlen("/") + strlen(argv[i]);

char *file = (char*)calloc(sizeof(char), len);
strncpy(file, dir, strlen(dir));
strncat(file, "/", strlen("/"));
strncat(file, argv[i], strlen(argv[i]));

FILE *src = fopen(argv[i], "r");
FILE *dst = fopen(file, "w");
char buf[MAX_SIZE] ={0, };

while(fread(buf, 1, sizeof(buf), src))
{
buf[strlen(buf)] = '\0';
fwrite(buf, 1, sizeof(buf), dst);
}

if(file)
{
memset(file, 0, len);
free(file);
}

fclose(dst);
fclose(src);
}

else
{
printf("Cannot found '%s' file\n", argv[i]);
}
}
}

else
{
printf("Cannot found '%s' directory\n", dir);
}

closedir(isdir);
return 0;
}