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lxcmntent: coding rules
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Signed-off-by: 2xsec <dh48.jeong@samsung.com>
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2xsec authored and Christian Brauner committed Nov 22, 2018
1 parent 837a2bf commit 36c4d87
Showing 1 changed file with 170 additions and 163 deletions.
333 changes: 170 additions & 163 deletions src/include/lxcmntent.c
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@@ -1,197 +1,204 @@
/* Utilities for reading/writing fstab, mtab, etc.
Copyright (C) 1995-2000, 2001, 2002, 2003, 2006
Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* Copyright (C) 1995-2000, 2001, 2002, 2003, 2006
* Free Software Foundation, Inc.
* This file is part of the GNU C Library.
*
* The GNU C Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* The GNU C Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <alloca.h>
#include <macro.h>
#include <mntent.h>
#include <stdio.h>
#include <string.h>
#include <mntent.h>

/* Since the values in a line are separated by spaces, a name cannot
contain a space. Therefore some programs encode spaces in names
by the strings "\040". We undo the encoding when reading an entry.
The decoding happens in place. */
static char *
decode_name (char *buf)
* contain a space. Therefore some programs encode spaces in names
* by the strings "\040". We undo the encoding when reading an entry.
* The decoding happens in place.
*/
static char *decode_name(char *buf)
{
char *rp = buf;
char *wp = buf;

do
if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '4' && rp[3] == '0')
{
/* \040 is a SPACE. */
*wp++ = ' ';
rp += 3;
}
else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' && rp[3] == '1')
{
/* \011 is a TAB. */
*wp++ = '\t';
rp += 3;
}
else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' && rp[3] == '2')
{
/* \012 is a NEWLINE. */
*wp++ = '\n';
rp += 3;
}
else if (rp[0] == '\\' && rp[1] == '\\')
{
/* We have to escape \\ to be able to represent all characters. */
*wp++ = '\\';
rp += 1;
}
else if (rp[0] == '\\' && rp[1] == '1' && rp[2] == '3' && rp[3] == '4')
{
/* \134 is also \\. */
*wp++ = '\\';
rp += 3;
}
else
*wp++ = *rp;
while (*rp++ != '\0');

return buf;
char *rp = buf;
char *wp = buf;

do {
if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '4' &&
rp[3] == '0') {
/* \040 is a SPACE. */
*wp++ = ' ';
rp += 3;
} else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' &&
rp[3] == '1') {
/* \011 is a TAB. */
*wp++ = '\t';
rp += 3;
} else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' &&
rp[3] == '2') {
/* \012 is a NEWLINE. */
*wp++ = '\n';
rp += 3;
} else if (rp[0] == '\\' && rp[1] == '\\') {
/* We have to escape \\ to be able to represent all characters. */
*wp++ = '\\';
rp += 1;
} else if (rp[0] == '\\' && rp[1] == '1' && rp[2] == '3' &&
rp[3] == '4') {
/* \134 is also \\. */
*wp++ = '\\';
rp += 3;
} else {
*wp++ = *rp;
}
} while (*rp++ != '\0');

return buf;
}

/* Read one mount table entry from STREAM. Returns a pointer to storage
reused on the next call, or null for EOF or error (use feof/ferror to
check). */
struct mntent *getmntent_r (FILE *stream, struct mntent *mp, char *buffer, int bufsiz)
* reused on the next call, or null for EOF or error (use feof/ferror to check).
*/
struct mntent *getmntent_r(FILE *stream, struct mntent *mp, char *buffer, int bufsiz)
{
char *cp;
char *head;

do
{
char *end_ptr;

if (fgets (buffer, bufsiz, stream) == NULL)
{
return NULL;
}

end_ptr = strchr (buffer, '\n');
if (end_ptr != NULL) /* chop newline */
*end_ptr = '\0';
else
{
/* Not the whole line was read. Do it now but forget it. */
char tmp[1024];
while (fgets (tmp, sizeof tmp, stream) != NULL)
if (strchr (tmp, '\n') != NULL)
break;
}

head = buffer + strspn (buffer, " \t");
/* skip empty lines and comment lines: */
}
while (head[0] == '\0' || head[0] == '#');

cp = strsep (&head, " \t");
mp->mnt_fsname = cp != NULL ? decode_name (cp) : (char *) "";
if (head)
head += strspn (head, " \t");
cp = strsep (&head, " \t");
mp->mnt_dir = cp != NULL ? decode_name (cp) : (char *) "";
if (head)
head += strspn (head, " \t");
cp = strsep (&head, " \t");
mp->mnt_type = cp != NULL ? decode_name (cp) : (char *) "";
if (head)
head += strspn (head, " \t");
cp = strsep (&head, " \t");
mp->mnt_opts = cp != NULL ? decode_name (cp) : (char *) "";
switch (head ? sscanf (head, " %d %d ", &mp->mnt_freq, &mp->mnt_passno) : 0)
{
case 0:
mp->mnt_freq = 0;
case 1:
mp->mnt_passno = 0;
case 2:
break;
}

return mp;
char *cp;
char *head;

do {
char *end_ptr;

if (!fgets(buffer, bufsiz, stream))
return NULL;

end_ptr = strchr(buffer, '\n');
if (end_ptr != NULL) {
/* chop newline */
*end_ptr = '\0';
} else {
/* Not the whole line was read. Do it now but forget it. */
char tmp[1024] = {0};

while (fgets(tmp, sizeof tmp, stream))
if (strchr(tmp, '\n') != NULL)
break;
}

head = buffer + strspn(buffer, " \t");
/* skip empty lines and comment lines: */
} while (head[0] == '\0' || head[0] == '#');

cp = strsep(&head, " \t");
mp->mnt_fsname = cp ? decode_name(cp) : (char *)"";
if (head)
head += strspn(head, " \t");

cp = strsep(&head, " \t");
mp->mnt_dir = cp ? decode_name(cp) : (char *)"";
if (head)
head += strspn(head, " \t");

cp = strsep(&head, " \t");
mp->mnt_type = cp ? decode_name(cp) : (char *)"";
if (head)
head += strspn(head, " \t");

cp = strsep(&head, " \t");
mp->mnt_opts = cp ? decode_name(cp) : (char *)"";
if (head) {
int ret = sscanf(head, " %d %d ", &mp->mnt_freq, &mp->mnt_passno);

switch (ret) {
case 0:
mp->mnt_freq = 0;
case 1:
mp->mnt_passno = 0;
case 2:
break;
}
} else {
mp->mnt_freq = 0;
}

return mp;
}

struct mntent *getmntent (FILE *stream)
struct mntent *getmntent(FILE *stream)
{
static struct mntent m;
static char *getmntent_buffer;
static struct mntent m;
static char *getmntent_buffer;

#define BUFFER_SIZE 4096
if (getmntent_buffer == NULL) {
getmntent_buffer = (char *) malloc (BUFFER_SIZE);
}
if (!getmntent_buffer) {
getmntent_buffer = (char *)malloc(LXC_MAX_BUFFER);
if (!getmntent_buffer)
return NULL;
}

return getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE);
#undef BUFFER_SIZE
return getmntent_r(stream, &m, getmntent_buffer, LXC_MAX_BUFFER);
}


/* Prepare to begin reading and/or writing mount table entries from the
beginning of FILE. MODE is as for `fopen'. */
FILE *setmntent (const char *file, const char *mode)
* beginning of FILE. MODE is as for `fopen'.
*/
FILE *setmntent(const char *file, const char *mode)
{
/* Extend the mode parameter with "c" to disable cancellation in the
I/O functions and "e" to set FD_CLOEXEC. */
size_t modelen = strlen (mode);
char *newmode;
/* Extend the mode parameter with "c" to disable cancellation in the
* I/O functions and "e" to set FD_CLOEXEC.
*/
size_t modelen = strlen(mode);
char *newmode;

newmode = alloca(modelen + 3);
newmode = alloca(modelen + 3);

memcpy (newmode, mode, modelen);
memcpy (newmode + modelen, "ce", 3);
FILE *result = fopen (file, newmode);
memcpy(newmode, mode, modelen);
memcpy(newmode + modelen, "ce", 3);

return result;
return fopen (file, newmode);
}


/* Close a stream opened with `setmntent'. */
int endmntent (FILE *stream)
int endmntent(FILE *stream)
{
if (stream) /* SunOS 4.x allows for NULL stream */
fclose (stream);
return 1; /* SunOS 4.x says to always return 1 */
/* SunOS 4.x allows for NULL stream */
if (stream)
fclose(stream);

/* SunOS 4.x says to always return 1 */
return 1;
}

/* 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)
* 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;
const size_t optlen = strlen(opt);
char *rest = mnt->mnt_opts, *p;

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

rest = strchr(p, ',');
if (!rest)
break;

++rest;
}

return NULL;
}

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