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C/C++ Quellcode

#define MAXBYTES 1024
 
int main(int argc, char **argv) {
 
	if(argc < 3) {
		(void) printf("usage of mybcp: mybcp [file to read] [file to write]");
		return EXIT_SUCCESS;
	}
 
	/* create a buffer variable */
	int *buffer = malloc(MAXBYTES);
	int readBytes = 1;
	int writtenBytes = 0;
 
	/* get the two file args */
	const char *readFile = *(argv + 1);
	const char *writeFile = *(argv + 2);
 
	/* open both files, create write file if it doesn't exists, set permissions */
	int openReadFile;
	if((openReadFile = open(readFile, O_RDONLY)) == -1) {
		(void) printf("error at opening reading file!");
		return EXIT_FAILURE;
	}
	int openWriteFile;
	if((openWriteFile = open(writeFile, O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR)) == -1) {
		(void) printf("error at opening writing file!");
		return EXIT_FAILURE;
	}
 
	/* read and write until read bytes are less or equal 0 */
	while((readBytes = read(openReadFile, buffer, MAXBYTES)) > 0) {
		writtenBytes = write(openWriteFile, buffer, readBytes);
		(void) printf("Anzahl Bytes gelesen: %d, Anzahl Bytes geschrieben: %d\n", readBytes, writtenBytes);
 
	}
 
	/* close file descriptor */
	close(openReadFile);
	close(openWriteFile);
 
	return EXIT_SUCCESS;
}