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mc/lib/vfs/parse_ls_vga.c
Yury V. Zaytsev eb1375b65d vfs: implement support for all known stat formats and centralize handling 
Signed-off-by: Yury V. Zaytsev <yury@shurup.com>
2024-07-28 10:00:52 +02:00

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/*
Routines for parsing output from the 'ls' command.
Copyright (C) 1988-2024
Free Software Foundation, Inc.
Copyright (C) 1995, 1996 Miguel de Icaza
Written by:
Miguel de Icaza, 1995, 1996
Slava Zanko <slavazanko@gmail.com>, 2011
This file is part of the Midnight Commander.
The Midnight Commander is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
The Midnight Commander 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file
* \brief Source: Utilities for VFS modules
* \author Miguel de Icaza
* \date 1995, 1996
*/
#include <config.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include "lib/global.h"
#include "lib/unixcompat.h" /* makedev */
#include "lib/widget.h" /* message() */
#include "utilvfs.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
/* Parsing code is used by ftpfs, shell and extfs */
#define MAXCOLS 30
/*** file scope type declarations ****************************************************************/
/*** forward declarations (file scope functions) *************************************************/
/*** file scope variables ************************************************************************/
static char *columns[MAXCOLS]; /* Points to the string in column n */
static int column_ptr[MAXCOLS]; /* Index from 0 to the starting positions of the columns */
static size_t vfs_parse_ls_final_num_spaces = 0;
/* --------------------------------------------------------------------------------------------- */
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
static gboolean
is_num (int idx)
{
char *column = columns[idx];
return (column != NULL && isdigit (column[0]));
}
/* --------------------------------------------------------------------------------------------- */
/* Return TRUE for MM-DD-YY and MM-DD-YYYY */
static gboolean
is_dos_date (const char *str)
{
size_t len;
if (str == NULL)
return FALSE;
len = strlen (str);
if (len != 8 && len != 10)
return FALSE;
if (str[2] != str[5])
return FALSE;
return (strchr ("\\-/", (int) str[2]) != NULL);
}
/* --------------------------------------------------------------------------------------------- */
static gboolean
is_week (const char *str, struct tm *tim)
{
static const char *week = "SunMonTueWedThuFriSat";
const char *pos;
if (str == NULL)
return FALSE;
pos = strstr (week, str);
if (pos == NULL)
return FALSE;
if (tim != NULL)
tim->tm_wday = (pos - week) / 3;
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Check for possible locale's abbreviated month name (Jan..Dec).
* Any 3 bytes long string without digit, control and punctuation characters.
* isalpha() is locale specific, so it cannot be used if current
* locale is "C" and ftp server use Cyrillic.
* NB: It is assumed there are no whitespaces in month.
*/
static gboolean
is_localized_month (const char *month)
{
int i;
if (month == NULL)
return FALSE;
for (i = 0;
i < 3 && *month != '\0' && !isdigit ((unsigned char) *month)
&& !iscntrl ((unsigned char) *month) && !ispunct ((unsigned char) *month); i++, month++)
;
return (i == 3 && *month == '\0');
}
/* --------------------------------------------------------------------------------------------- */
static gboolean
is_time (const char *str, struct tm *tim)
{
const char *p, *p2;
if (str == NULL)
return FALSE;
p = strchr (str, ':');
if (p == NULL)
return FALSE;
p2 = strrchr (str, ':');
if (p2 == NULL)
return FALSE;
if (p != p2)
{
if (sscanf (str, "%2d:%2d:%2d", &tim->tm_hour, &tim->tm_min, &tim->tm_sec) != 3)
return FALSE;
}
else
{
if (sscanf (str, "%2d:%2d", &tim->tm_hour, &tim->tm_min) != 2)
return FALSE;
}
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
static gboolean
is_year (char *str, struct tm *tim)
{
long year;
if (str == NULL)
return FALSE;
if (strchr (str, ':') != NULL)
return FALSE;
if (strlen (str) != 4)
return FALSE;
/* cppcheck-suppress invalidscanf */
if (sscanf (str, "%ld", &year) != 1)
return FALSE;
if (year < 1900 || year > 3000)
return FALSE;
tim->tm_year = (int) (year - 1900);
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
gboolean
vfs_parse_filetype (const char *s, size_t *ret_skipped, mode_t *ret_type)
{
mode_t type;
switch (*s)
{
case 'd':
type = S_IFDIR;
break;
case 'b':
type = S_IFBLK;
break;
case 'c':
type = S_IFCHR;
break;
case 'l':
type = S_IFLNK;
break;
#ifdef S_IFSOCK
case 's':
type = S_IFSOCK;
break;
#else
case 's':
type = S_IFIFO;
break;
#endif
#ifdef S_IFDOOR /* Solaris door */
case 'D':
type = S_IFDOOR;
break;
#else
case 'D':
type = S_IFIFO;
break;
#endif
case 'p':
type = S_IFIFO;
break;
#ifdef S_IFNAM /* Special named files */
case 'n':
type = S_IFNAM;
break;
#else
case 'n':
type = S_IFREG;
break;
#endif
case 'm': /* Don't know what these are :-) */
case '-':
case '?':
type = S_IFREG;
break;
default:
return FALSE;
}
*ret_type = type;
if (ret_skipped != NULL)
*ret_skipped = 1;
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
gboolean
vfs_parse_fileperms (const char *s, size_t *ret_skipped, mode_t *ret_perms)
{
const char *p = s;
mode_t perms = 0;
switch (*p++)
{
case '-':
break;
case 'r':
perms |= S_IRUSR;
break;
default:
return FALSE;
}
switch (*p++)
{
case '-':
break;
case 'w':
perms |= S_IWUSR;
break;
default:
return FALSE;
}
switch (*p++)
{
case '-':
break;
case 'S':
perms |= S_ISUID;
break;
case 's':
perms |= S_IXUSR | S_ISUID;
break;
case 'x':
perms |= S_IXUSR;
break;
default:
return FALSE;
}
switch (*p++)
{
case '-':
break;
case 'r':
perms |= S_IRGRP;
break;
default:
return FALSE;
}
switch (*p++)
{
case '-':
break;
case 'w':
perms |= S_IWGRP;
break;
default:
return FALSE;
}
switch (*p++)
{
case '-':
break;
case 'S':
perms |= S_ISGID;
break;
case 'l':
perms |= S_ISGID;
break; /* found on Solaris */
case 's':
perms |= S_IXGRP | S_ISGID;
break;
case 'x':
perms |= S_IXGRP;
break;
default:
return FALSE;
}
switch (*p++)
{
case '-':
break;
case 'r':
perms |= S_IROTH;
break;
default:
return FALSE;
}
switch (*p++)
{
case '-':
break;
case 'w':
perms |= S_IWOTH;
break;
default:
return FALSE;
}
switch (*p++)
{
case '-':
break;
case 'T':
perms |= S_ISVTX;
break;
case 't':
perms |= S_IXOTH | S_ISVTX;
break;
case 'x':
perms |= S_IXOTH;
break;
default:
return FALSE;
}
if (*p == '+')
/* ACLs on Solaris, HP-UX and others */
p++;
if (ret_skipped != NULL)
*ret_skipped = p - s;
*ret_perms = perms;
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
gboolean
vfs_parse_filemode (const char *s, size_t *ret_skipped, mode_t *ret_mode)
{
const char *p = s;
mode_t type, perms;
size_t skipped;
if (!vfs_parse_filetype (p, &skipped, &type))
return FALSE;
p += skipped;
if (!vfs_parse_fileperms (p, &skipped, &perms))
return FALSE;
p += skipped;
*ret_skipped = p - s;
*ret_mode = type | perms;
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
gboolean
vfs_parse_raw_filemode (const char *s, size_t *ret_skipped, mode_t *ret_mode)
{
const char *p = s;
mode_t remote_type = 0, local_type, perms = 0;
/* isoctal */
for (; *p >= '0' && *p <= '7'; p++)
{
perms *= 010;
perms += (*p - '0');
}
if (*p++ != ' ')
return FALSE;
for (; *p >= '0' && *p <= '7'; p++)
{
remote_type *= 010;
remote_type += (*p - '0');
}
if (*p++ != ' ')
return FALSE;
/* generated with:
$ perl -e 'use Fcntl ":mode";
my @modes = (S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, S_IFREG);
foreach $t (@modes) { printf ("%o\n", $t); };'
TODO: S_IFDOOR, S_IFIFO, S_IFSOCK (if supported by os)
(see vfs_parse_filetype)
*/
switch (remote_type)
{
case 020000:
local_type = S_IFCHR;
break;
case 040000:
local_type = S_IFDIR;
break;
case 060000:
local_type = S_IFBLK;
break;
case 0120000:
local_type = S_IFLNK;
break;
case 0100000:
default: /* don't know what is it */
local_type = S_IFREG;
break;
}
*ret_skipped = p - s;
*ret_mode = local_type | perms;
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
gboolean
vfs_parse_month (const char *str, struct tm *tim)
{
static const char *month = "JanFebMarAprMayJunJulAugSepOctNovDec";
const char *pos;
if (str == NULL)
return FALSE;
pos = strstr (month, str);
if (pos == NULL)
return FALSE;
if (tim != NULL)
tim->tm_mon = (pos - month) / 3;
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
/** This function parses from idx in the columns[] array */
int
vfs_parse_filedate (int idx, time_t *t)
{
char *p;
struct tm tim;
int d[3];
gboolean got_year = FALSE;
gboolean l10n = FALSE; /* Locale's abbreviated month name */
time_t current_time;
struct tm *local_time;
/* Let's setup default time values */
current_time = time (NULL);
local_time = localtime (&current_time);
tim.tm_mday = local_time->tm_mday;
tim.tm_mon = local_time->tm_mon;
tim.tm_year = local_time->tm_year;
tim.tm_hour = 0;
tim.tm_min = 0;
tim.tm_sec = 0;
tim.tm_isdst = -1; /* Let mktime() try to guess correct dst offset */
p = columns[idx++];
/* We eat weekday name in case of extfs */
if (is_week (p, &tim))
p = columns[idx++];
/*
ALLOWED DATE FORMATS
We expect 3 fields max or we'll see oddities with certain file names.
Formats that contain either year or time (the default 'ls' formats):
* Mon DD hh:mm[:ss]
* Mon DD YYYY
Formats that contain both year and time, to make it easier to write
extfs scripts:
* MM-DD-YYYY hh:mm[:ss]
* MM-DD-YY hh:mm[:ss]
('/' and '\' can be used instead of '-'.)
where Mon is Jan-Dec, DD, MM, YY two digit day, month, year,
YYYY four digit year, hh, mm, ss two digit hour, minute or second.
(As for the "3 fields max" restriction: this prevents, for example, a
file name "13:48" from being considered part of a "Sep 19 2016" date
string preceding it.)
*/
/* Month name */
if (vfs_parse_month (p, &tim))
{
/* And we expect, it followed by day number */
if (!is_num (idx))
return 0; /* No day */
tim.tm_mday = (int) atol (columns[idx++]);
}
else if (is_dos_date (p))
{
/* Case with MM-DD-YY or MM-DD-YYYY */
p[2] = p[5] = '-';
/* cppcheck-suppress invalidscanf */
if (sscanf (p, "%2d-%2d-%d", &d[0], &d[1], &d[2]) != 3)
return 0; /* sscanf failed */
/* Months are zero based */
if (d[0] > 0)
d[0]--;
if (d[2] > 1900)
d[2] -= 1900;
else if (d[2] < 70)
/* Y2K madness */
d[2] += 100;
tim.tm_mon = d[0];
tim.tm_mday = d[1];
tim.tm_year = d[2];
got_year = TRUE;
}
else if (is_localized_month (p) && is_num (idx++))
/* Locale's abbreviated month name followed by day number */
l10n = TRUE;
else
return 0; /* unsupported format */
/* Here we expect to find time or year */
if (!is_num (idx)
|| !(is_time (columns[idx], &tim) || (got_year = is_year (columns[idx], &tim))))
return 0; /* Neither time nor date */
idx++;
/*
* If the date is less than 6 months in the past, it is shown without year
* other dates in the past or future are shown with year but without time
* This does not check for years before 1900 ... I don't know, how
* to represent them at all
*/
if (!got_year && local_time->tm_mon < 6 && local_time->tm_mon < tim.tm_mon
&& tim.tm_mon - local_time->tm_mon >= 6)
tim.tm_year--;
*t = mktime (&tim);
if (l10n || (*t < 0))
*t = 0;
return idx;
}
/* --------------------------------------------------------------------------------------------- */
int
vfs_split_text (char *p)
{
char *original = p;
int numcols;
memset (columns, 0, sizeof (columns));
for (numcols = 0; *p != '\0' && numcols < MAXCOLS; numcols++)
{
for (; *p == ' ' || *p == '\r' || *p == '\n'; p++)
*p = '\0';
columns[numcols] = p;
column_ptr[numcols] = p - original;
for (; *p != '\0' && *p != ' ' && *p != '\r' && *p != '\n'; p++)
;
}
return numcols;
}
/* --------------------------------------------------------------------------------------------- */
void
vfs_parse_ls_lga_init (void)
{
vfs_parse_ls_final_num_spaces = 1;
}
/* --------------------------------------------------------------------------------------------- */
size_t
vfs_parse_ls_lga_get_final_spaces (void)
{
return vfs_parse_ls_final_num_spaces;
}
/* --------------------------------------------------------------------------------------------- */
gboolean
vfs_parse_ls_lga (const char *p, struct stat *s, char **filename, char **linkname,
size_t *num_spaces)
{
int idx, idx2, num_cols;
int i;
char *p_copy = NULL;
char *t = NULL;
const char *line = p;
size_t skipped;
if (strncmp (p, "total", 5) == 0)
return FALSE;
if (!vfs_parse_filetype (p, &skipped, &s->st_mode))
goto error;
p += skipped;
if (*p == ' ') /* Notwell 4 */
p++;
if (*p == '[')
{
if (strlen (p) <= 8 || p[8] != ']')
goto error;
/* Should parse here the Novell permissions :) */
if (S_ISDIR (s->st_mode))
s->st_mode |= (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IXUSR | S_IXGRP | S_IXOTH);
else
s->st_mode |= (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR);
p += 9;
}
else
{
size_t lc_skipped;
mode_t perms;
if (!vfs_parse_fileperms (p, &lc_skipped, &perms))
goto error;
p += lc_skipped;
s->st_mode |= perms;
}
p_copy = g_strdup (p);
num_cols = vfs_split_text (p_copy);
s->st_nlink = atol (columns[0]);
if (s->st_nlink <= 0)
goto error;
if (!is_num (1))
s->st_uid = vfs_finduid (columns[1]);
else
s->st_uid = (uid_t) atol (columns[1]);
/* Mhm, the ls -lg did not produce a group field */
for (idx = 3; idx <= 5; idx++)
if (vfs_parse_month (columns[idx], NULL) || is_week (columns[idx], NULL)
|| is_dos_date (columns[idx]) || is_localized_month (columns[idx]))
break;
if (idx == 6 || (idx == 5 && !S_ISCHR (s->st_mode) && !S_ISBLK (s->st_mode)))
goto error;
/* We don't have gid */
if (idx == 3 || (idx == 4 && (S_ISCHR (s->st_mode) || S_ISBLK (s->st_mode))))
idx2 = 2;
else
{
/* We have gid field */
if (is_num (2))
s->st_gid = (gid_t) atol (columns[2]);
else
s->st_gid = vfs_findgid (columns[2]);
idx2 = 3;
}
/* This is device */
if (S_ISCHR (s->st_mode) || S_ISBLK (s->st_mode))
{
int maj, min;
/* Corner case: there is no whitespace(s) between maj & min */
if (!is_num (idx2) && idx2 == 2)
{
/* cppcheck-suppress invalidscanf */
if (!is_num (++idx2) || sscanf (columns[idx2], " %d,%d", &maj, &min) != 2)
goto error;
}
else
{
/* cppcheck-suppress invalidscanf */
if (!is_num (idx2) || sscanf (columns[idx2], " %d,", &maj) != 1)
goto error;
/* cppcheck-suppress invalidscanf */
if (!is_num (++idx2) || sscanf (columns[idx2], " %d", &min) != 1)
goto error;
}
#ifdef HAVE_STRUCT_STAT_ST_RDEV
s->st_rdev = makedev (maj, min);
#endif
s->st_size = 0;
}
else
{
/* Common file size */
if (!is_num (idx2))
goto error;
s->st_size = (off_t) g_ascii_strtoll (columns[idx2], NULL, 10);
#ifdef HAVE_STRUCT_STAT_ST_RDEV
s->st_rdev = 0;
#endif
}
vfs_zero_stat_times (s);
idx = vfs_parse_filedate (idx, &s->st_mtime);
if (idx == 0)
goto error;
/* Use resulting time value */
s->st_atime = s->st_ctime = s->st_mtime;
/* s->st_dev and s->st_ino must be initialized by vfs_s_new_inode () */
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
s->st_blksize = 512;
#endif
vfs_adjust_stat (s);
if (num_spaces != NULL)
{
*num_spaces = column_ptr[idx] - column_ptr[idx - 1] - strlen (columns[idx - 1]);
if (DIR_IS_DOTDOT (columns[idx]))
vfs_parse_ls_final_num_spaces = *num_spaces;
}
for (i = idx + 1, idx2 = 0; i < num_cols; i++)
if (strcmp (columns[i], "->") == 0)
{
idx2 = i;
break;
}
if (((S_ISLNK (s->st_mode) || (num_cols == idx + 3 && s->st_nlink > 1))) /* Maybe a hardlink? (in extfs) */
&& idx2 != 0)
{
if (filename != NULL)
*filename = g_strndup (p + column_ptr[idx], column_ptr[idx2] - column_ptr[idx] - 1);
if (linkname != NULL)
{
t = g_strdup (p + column_ptr[idx2 + 1]);
*linkname = t;
}
}
else
{
/* Extract the filename from the string copy, not from the columns
* this way we have a chance of entering hidden directories like ". ."
*/
if (filename != NULL)
{
/* filename = g_strdup (columns [idx++]); */
t = g_strdup (p + column_ptr[idx]);
*filename = t;
}
if (linkname != NULL)
*linkname = NULL;
}
if (t != NULL)
{
size_t p2;
p2 = strlen (t);
if (--p2 > 0 && (t[p2] == '\r' || t[p2] == '\n'))
t[p2] = '\0';
if (--p2 > 0 && (t[p2] == '\r' || t[p2] == '\n'))
t[p2] = '\0';
}
g_free (p_copy);
return TRUE;
error:
{
static int errorcount = 0;
if (++errorcount < 5)
message (D_ERROR, _("Cannot parse:"), "%s",
(p_copy != NULL && *p_copy != '\0') ? p_copy : line);
else if (errorcount == 5)
message (D_ERROR, MSG_ERROR, _("More parsing errors will be ignored."));
}
g_free (p_copy);
return FALSE;
}
/* --------------------------------------------------------------------------------------------- */
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