erase.c

如何制作JFFS文件系统

/*
 * $ Revision 1.1  (c) 2001/10/13. Zhihui Li, Wanhe Metwork Corp.,Ltd.$
 * Added command line processing and GNU long options.
 *
 */

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
#include <linux/flash.h>

extern char *optarg;	/* Option argument */
extern int optind;		/* Option/arg index */
extern int opterr;		/* Error handling flg */

/* Show brief command usage help: */
static void usage(const char*cmd) {
	fprintf(stderr,"Usage: %s [-h | --help] [--version] infile...\n",cmd);
 	printf("\t-h (or --help)\tGives this command help display.\n"
		"\t\t\tYour should do like this 'erase /dev/flash1'\n",stderr);
	printf("\t--version\tDisplay program version.\n",stderr);
}

static char* Basename(const char *path){
	char *base_name=0;
	if((base_name=strrchr(path,'/'))!=0)
		++base_name;		/* Skip over */
	else
		base_name =(char*)path;	/* No dir. */
	return base_name;
	}

int main(int argc, char *argv[])
{
	int	fd;
	
	char *base_name=0;
	int cmdx=0;		/* lopts[] index */
	int optch;		/* Current option character */
	static char stropts[]="h";	/* Supported options */
	static struct option lopts[]={
		{"help",0,0,'h'},			/* --help */
		{"version",0,0,'v'},	/* --version */
		{0,0,0,0}
	};

	base_name=Basename(argv[0]);	

	/*
	 * Process all command line options :
	 */
 	while((optch=getopt_long(argc,argv,stropts,lopts,&cmdx))!=EOF)
		
		switch(optch){
		case 0:		/* Processed lopts[cmdx] */
			break;
		case 'h':
			usage(base_name);
			return 0;
		case 'v':
			fprintf(stderr,"\tVision 1.1  (c) 2001/10/13. Zhihui Lee, Wanhe Metwork Corp.,Ltd.\n");
			return 0;
		default:	/* Unsupported option */
			printf("Use --help or -h for help.\n");
			return 1;
		}
	
	if (argc != 2) {
		puts("Usage: erase /dev/flashX\n"
			 "Use --help or -h for help\n");
		exit(1);
	}

	if ((fd = open(argv[1], O_RDWR)) < 0) {
		perror("open");
		exit(1);
	}

	if (ioctl(fd, FLASHIO_ERASEALL, 0L) == -1) {
		perror("ioctl(FLASHIO_ERASEALL)");
		close(fd);
		exit(1);
	}

	close(fd);
	exit(0);
}