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lxcmntent: coding rules

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Signed-off-by: 2xsec <dh48.jeong@samsung.com>
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2xsec 2018-11-02 15:17:14 +09:00
parent a8c7d037e3
commit 5f76b90f47
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1 changed files with 159 additions and 152 deletions
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src/include/lxcmntent.c
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@ -1,197 +1,204 @@
/* Utilities for reading/writing fstab, mtab, etc. /* Utilities for reading/writing fstab, mtab, etc.
Copyright (C) 1995-2000, 2001, 2002, 2003, 2006 * Copyright (C) 1995-2000, 2001, 2002, 2003, 2006
Free Software Foundation, Inc. * Free Software Foundation, Inc.
This file is part of the GNU C Library. * This file is part of the GNU C Library.
*
The GNU C Library is free software; you can redistribute it and/or * The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public * modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either * License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. * 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, * The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of * but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details. * Lesser General Public License for more details.
*
You should have received a copy of the GNU Lesser General Public * You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software * License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/ */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <alloca.h> #include <alloca.h>
#include <macro.h>
#include <mntent.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include <mntent.h>
/* Since the values in a line are separated by spaces, a name cannot /* Since the values in a line are separated by spaces, a name cannot
contain a space. Therefore some programs encode spaces in names * contain a space. Therefore some programs encode spaces in names
by the strings "\040". We undo the encoding when reading an entry. * by the strings "\040". We undo the encoding when reading an entry.
The decoding happens in place. */ * The decoding happens in place.
static char * */
decode_name (char *buf) static char *decode_name(char *buf)
{ {
char *rp = buf; char *rp = buf;
char *wp = buf; char *wp = buf;
do do {
if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '4' && rp[3] == '0') if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '4' &&
{ rp[3] == '0') {
/* \040 is a SPACE. */ /* \040 is a SPACE. */
*wp++ = ' '; *wp++ = ' ';
rp += 3; rp += 3;
} } else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' &&
else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' && rp[3] == '1') rp[3] == '1') {
{ /* \011 is a TAB. */
/* \011 is a TAB. */ *wp++ = '\t';
*wp++ = '\t'; rp += 3;
rp += 3; } else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' &&
} rp[3] == '2') {
else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' && rp[3] == '2') /* \012 is a NEWLINE. */
{ *wp++ = '\n';
/* \012 is a NEWLINE. */ rp += 3;
*wp++ = '\n'; } else if (rp[0] == '\\' && rp[1] == '\\') {
rp += 3; /* We have to escape \\ to be able to represent all characters. */
} *wp++ = '\\';
else if (rp[0] == '\\' && rp[1] == '\\') rp += 1;
{ } else if (rp[0] == '\\' && rp[1] == '1' && rp[2] == '3' &&
/* We have to escape \\ to be able to represent all characters. */ rp[3] == '4') {
*wp++ = '\\'; /* \134 is also \\. */
rp += 1; *wp++ = '\\';
} rp += 3;
else if (rp[0] == '\\' && rp[1] == '1' && rp[2] == '3' && rp[3] == '4') } else {
{ *wp++ = *rp;
/* \134 is also \\. */ }
*wp++ = '\\'; } while (*rp++ != '\0');
rp += 3;
}
else
*wp++ = *rp;
while (*rp++ != '\0');
return buf; return buf;
} }
/* Read one mount table entry from STREAM. Returns a pointer to storage /* 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 * reused on the next call, or null for EOF or error (use feof/ferror to check).
check). */ */
struct mntent *getmntent_r (FILE *stream, struct mntent *mp, char *buffer, int bufsiz) struct mntent *getmntent_r(FILE *stream, struct mntent *mp, char *buffer, int bufsiz)
{ {
char *cp; char *cp;
char *head; char *head;
do do {
{ char *end_ptr;
char *end_ptr;
if (fgets (buffer, bufsiz, stream) == NULL) if (!fgets(buffer, bufsiz, stream))
{ return NULL;
return NULL;
}
end_ptr = strchr (buffer, '\n'); end_ptr = strchr(buffer, '\n');
if (end_ptr != NULL) /* chop newline */ if (end_ptr != NULL) {
*end_ptr = '\0'; /* chop newline */
else *end_ptr = '\0';
{ } else {
/* Not the whole line was read. Do it now but forget it. */ /* Not the whole line was read. Do it now but forget it. */
char tmp[1024]; char tmp[1024] = {0};
while (fgets (tmp, sizeof tmp, stream) != NULL)
if (strchr (tmp, '\n') != NULL)
break;
}
head = buffer + strspn (buffer, " \t"); while (fgets(tmp, sizeof tmp, stream))
/* skip empty lines and comment lines: */ if (strchr(tmp, '\n') != NULL)
} break;
while (head[0] == '\0' || head[0] == '#'); }
cp = strsep (&head, " \t"); head = buffer + strspn(buffer, " \t");
mp->mnt_fsname = cp != NULL ? decode_name (cp) : (char *) ""; /* skip empty lines and comment lines: */
if (head) } while (head[0] == '\0' || head[0] == '#');
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; 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 struct mntent m;
static char *getmntent_buffer; static char *getmntent_buffer;
#define BUFFER_SIZE 4096 if (!getmntent_buffer) {
if (getmntent_buffer == NULL) { getmntent_buffer = (char *)malloc(LXC_MAX_BUFFER);
getmntent_buffer = (char *) malloc (BUFFER_SIZE); if (!getmntent_buffer)
} return NULL;
}
return getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE); return getmntent_r(stream, &m, getmntent_buffer, LXC_MAX_BUFFER);
#undef BUFFER_SIZE
} }
/* Prepare to begin reading and/or writing mount table entries from the /* Prepare to begin reading and/or writing mount table entries from the
beginning of FILE. MODE is as for `fopen'. */ * beginning of FILE. MODE is as for `fopen'.
FILE *setmntent (const char *file, const char *mode) */
FILE *setmntent(const char *file, const char *mode)
{ {
/* Extend the mode parameter with "c" to disable cancellation in the /* Extend the mode parameter with "c" to disable cancellation in the
I/O functions and "e" to set FD_CLOEXEC. */ * I/O functions and "e" to set FD_CLOEXEC.
size_t modelen = strlen (mode); */
char *newmode; size_t modelen = strlen(mode);
char *newmode;
newmode = alloca(modelen + 3); newmode = alloca(modelen + 3);
memcpy (newmode, mode, modelen); memcpy(newmode, mode, modelen);
memcpy (newmode + modelen, "ce", 3); memcpy(newmode + modelen, "ce", 3);
FILE *result = fopen (file, newmode);
return result; return fopen (file, newmode);
} }
/* Close a stream opened with `setmntent'. */ /* Close a stream opened with `setmntent'. */
int endmntent (FILE *stream) int endmntent(FILE *stream)
{ {
if (stream) /* SunOS 4.x allows for NULL stream */ /* SunOS 4.x allows for NULL stream */
fclose (stream); if (stream)
return 1; /* SunOS 4.x says to always return 1 */ fclose(stream);
/* SunOS 4.x says to always return 1 */
return 1;
} }
/* Search MNT->mnt_opts for an option matching OPT. /* Search MNT->mnt_opts for an option matching OPT.
Returns the address of the substring, or null if none found. */ * Returns the address of the substring, or null if none found.
char *hasmntopt (const struct mntent *mnt, const char *opt) */
char *hasmntopt(const struct mntent *mnt, const char *opt)
{ {
const size_t optlen = strlen (opt); const size_t optlen = strlen(opt);
char *rest = mnt->mnt_opts, *p; char *rest = mnt->mnt_opts, *p;
while ((p = strstr (rest, opt)) != NULL) while ((p = strstr(rest, opt))) {
{ if ((p == rest || p[-1] == ',') &&
if ((p == rest || p[-1] == ',') (p[optlen] == '\0' || p[optlen] == '=' || p[optlen] == ','))
&& (p[optlen] == '\0' || p[optlen] == '=' || p[optlen] == ',')) return p;
return p;
rest = strchr (p, ','); rest = strchr(p, ',');
if (rest == NULL) if (!rest)
break; break;
++rest;
}
return NULL; ++rest;
}
return NULL;
} }