uclibc-ng/libc/misc/mntent/mntent.c

/*
 * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
 * Copyright (C) 1995-2020 Free Software Foundation, Inc.
 *
 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mntent.h>
#include <bits/uClibc_mutex.h>

__UCLIBC_MUTEX_STATIC(mylock, PTHREAD_MUTEX_INITIALIZER);



/* Reentrant version of getmntent.  */
struct mntent *getmntent_r (FILE *filep,
	struct mntent *mnt, char *buff, int bufsize)
{
	static const char sep[] = " \t\n";

	char *cp, *ptrptr;

	if (!filep || !mnt || !buff)
	    return NULL;

	/* Loop on the file, skipping comment lines. - FvK 03/07/93 */
	while ((cp = fgets(buff, bufsize, 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;

	ptrptr = 0;
	mnt->mnt_fsname = strtok_r(buff, sep, &ptrptr);
	if (mnt->mnt_fsname == NULL)
		return NULL;

	mnt->mnt_dir = strtok_r(NULL, sep, &ptrptr);
	if (mnt->mnt_dir == NULL)
		return NULL;

	mnt->mnt_type = strtok_r(NULL, sep, &ptrptr);
	if (mnt->mnt_type == NULL)
		return NULL;

	mnt->mnt_opts = strtok_r(NULL, sep, &ptrptr);
	if (mnt->mnt_opts == NULL)
		mnt->mnt_opts = "";

	cp = strtok_r(NULL, sep, &ptrptr);
	mnt->mnt_freq = (cp != NULL) ? atoi(cp) : 0;

	cp = strtok_r(NULL, sep, &ptrptr);
	mnt->mnt_passno = (cp != NULL) ? atoi(cp) : 0;

	return mnt;
}
libc_hidden_def(getmntent_r)

struct mntent *getmntent(FILE * filep)
{
    struct mntent *tmp;
    static char *buff = NULL;
    static struct mntent mnt;
    __UCLIBC_MUTEX_LOCK(mylock);

    if (!buff) {
            buff = malloc(BUFSIZ);
		if (!buff)
		    abort();
    }

    tmp = getmntent_r(filep, &mnt, buff, BUFSIZ);
    __UCLIBC_MUTEX_UNLOCK(mylock);
    return(tmp);
}

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

	return (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) < 0 ? 1 : 0);
}

/* Search MNT->mnt_opts for an option matching OPT.
   Returns the address of the substring, or null if none found.  */
char *hasmntopt (const struct mntent *mnt, const char *opt)
{
    const size_t optlen = strlen(opt);
    char *rest = mnt->mnt_opts, *p;

    while ((p = strstr(rest, opt)) != NULL) {
        if ((p == rest || p[-1] == ',')
            && (p[optlen] == '\0' || p[optlen] == '=' || p[optlen] == ','))
            return p;

        rest = strchr(p, ',');
        if (rest == NULL)
            break;
        ++rest;
    }

    return NULL;
}

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

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