mntent.c

linux下用PCMCIA无线网卡虚拟无线AP的程序源码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mntent.h>



struct mntent *getmntent(FILE * filep)
{
	char *cp, *sep = " \t\n";
	static char buff[BUFSIZ];
	static struct mntent mnt;

	/* Loop on the file, skipping comment lines. - FvK 03/07/93 */
	while ((cp = fgets(buff, sizeof buff, filep)) != NULL) {
		if (buff[0] == '#' || buff[0] == '\n')
			continue;
		break;
	}

	/* At the EOF, the buffer should be unchanged. We should
	 * check the return value from fgets ().
	 */
	if (cp == NULL)
		return NULL;

	mnt.mnt_fsname = strtok(buff, sep);
	if (mnt.mnt_fsname == NULL)
		return NULL;

	mnt.mnt_dir = strtok(NULL, sep);
	if (mnt.mnt_dir == NULL)
		return NULL;

	mnt.mnt_type = strtok(NULL, sep);
	if (mnt.mnt_type == NULL)
		return NULL;

	mnt.mnt_opts = strtok(NULL, sep);
	if (mnt.mnt_opts == NULL)
		mnt.mnt_opts = "";

	cp = strtok(NULL, sep);
	mnt.mnt_freq = (cp != NULL) ? atoi(cp) : 0;

	cp = strtok(NULL, sep);
	mnt.mnt_passno = (cp != NULL) ? atoi(cp) : 0;

	return &mnt;
}

int addmntent(FILE * filep, const struct mntent *mnt)
{
	if (fseek(filep, 0, SEEK_END) < 0)
		return 1;

	if (fprintf (filep, "%s %s %s %s %d %d\n", mnt->mnt_fsname, mnt->mnt_dir,
		 mnt->mnt_type, mnt->mnt_opts, mnt->mnt_freq, mnt->mnt_passno) < 1)
		return 1;

	return 0;
}

char *hasmntopt(const struct mntent *mnt, const char *opt)
{
	return strstr(mnt->mnt_opts, opt);
}

FILE *setmntent(const char *name, const char *mode)
{
	return fopen(name, mode);
}

int endmntent(FILE * filep)
{
	if (filep != NULL)
		fclose(filep);
	return 1;
}