mc/vfs/samba/lib/util_file.c

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/*
* Unix SMB/Netbios implementation. Version 1.9. SMB parameters and setup
* Copyright (C) Andrew Tridgell 1992-1998 Modified by Jeremy Allison 1995.
*
* This program 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 2 of the License, or (at your option)
* any later version.
*
* This program 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, write to the Free Software Foundation, Inc., 675
* Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern int DEBUGLEVEL;
#if 0
static int gotalarm;
/***************************************************************
Signal function to tell us we timed out.
****************************************************************/
static void gotalarm_sig(void)
{
gotalarm = 1;
}
/***************************************************************
Lock or unlock a fd for a known lock type. Abandon after waitsecs
seconds.
****************************************************************/
BOOL do_file_lock(int fd, int waitsecs, int type)
{
SMB_STRUCT_FLOCK lock;
int ret;
gotalarm = 0;
CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
lock.l_type = type;
lock.l_whence = SEEK_SET;
lock.l_start = 0;
lock.l_len = 1;
lock.l_pid = 0;
alarm(waitsecs);
ret = fcntl(fd, SMB_F_SETLKW, &lock);
alarm(0);
CatchSignal(SIGALRM, SIGNAL_CAST SIG_DFL);
if (gotalarm) {
DEBUG(0, ("do_file_lock: failed to %s file.\n",
type == F_UNLCK ? "unlock" : "lock"));
return False;
}
return (ret == 0);
}
/***************************************************************
Lock an fd. Abandon after waitsecs seconds.
****************************************************************/
BOOL file_lock(int fd, int type, int secs, int *plock_depth)
{
if (fd < 0)
return False;
(*plock_depth)++;
if ((*plock_depth) == 0)
{
if (!do_file_lock(fd, secs, type)) {
DEBUG(10,("file_lock: locking file failed, error = %s.\n",
strerror(errno)));
return False;
}
}
return True;
}
/***************************************************************
Unlock an fd. Abandon after waitsecs seconds.
****************************************************************/
BOOL file_unlock(int fd, int *plock_depth)
{
BOOL ret=True;
if(*plock_depth == 1)
ret = do_file_lock(fd, 5, F_UNLCK);
(*plock_depth)--;
if(!ret)
DEBUG(10,("file_unlock: unlocking file failed, error = %s.\n",
strerror(errno)));
return ret;
}
/***************************************************************
locks a file for enumeration / modification.
update to be set = True if modification is required.
****************************************************************/
void *startfilepwent(char *pfile, char *s_readbuf, int bufsize,
int *file_lock_depth, BOOL update)
{
FILE *fp = NULL;
if (!*pfile)
{
DEBUG(0, ("startfilepwent: No file set\n"));
return (NULL);
}
DEBUG(10, ("startfilepwent: opening file %s\n", pfile));
fp = sys_fopen(pfile, update ? "r+b" : "rb");
if (fp == NULL) {
DEBUG(0, ("startfilepwent: unable to open file %s\n", pfile));
return NULL;
}
/* Set a buffer to do more efficient reads */
setvbuf(fp, s_readbuf, _IOFBF, bufsize);
if (!file_lock(fileno(fp), (update ? F_WRLCK : F_RDLCK), 5, file_lock_depth))
{
DEBUG(0, ("startfilepwent: unable to lock file %s\n", pfile));
fclose(fp);
return NULL;
}
/* Make sure it is only rw by the owner */
chmod(pfile, 0600);
/* We have a lock on the file. */
return (void *)fp;
}
/***************************************************************
End enumeration of the file.
****************************************************************/
void endfilepwent(void *vp, int *file_lock_depth)
{
FILE *fp = (FILE *)vp;
file_unlock(fileno(fp), file_lock_depth);
fclose(fp);
DEBUG(7, ("endfilepwent: closed file.\n"));
}
#endif
/*************************************************************************
Return the current position in the file list as an SMB_BIG_UINT.
This must be treated as an opaque token.
*************************************************************************/
SMB_BIG_UINT getfilepwpos(void *vp)
{
return (SMB_BIG_UINT)sys_ftell((FILE *)vp);
}
/*************************************************************************
Set the current position in the file list from an SMB_BIG_UINT.
This must be treated as an opaque token.
*************************************************************************/
BOOL setfilepwpos(void *vp, SMB_BIG_UINT tok)
{
return !sys_fseek((FILE *)vp, (SMB_OFF_T)tok, SEEK_SET);
}
/*************************************************************************
gets a line out of a file.
line is of format "xxxx:xxxxxx:xxxxx:".
lines with "#" at the front are ignored.
*************************************************************************/
int getfileline(void *vp, char *linebuf, int linebuf_size)
{
/* Static buffers we will return. */
FILE *fp = (FILE *)vp;
unsigned char c;
unsigned char *p;
size_t linebuf_len;
if (fp == NULL)
{
DEBUG(0,("getfileline: Bad file pointer.\n"));
return -1;
}
/*
* Scan the file, a line at a time.
*/
while (!feof(fp))
{
linebuf[0] = '\0';
fgets(linebuf, linebuf_size, fp);
if (ferror(fp))
{
return -1;
}
/*
* Check if the string is terminated with a newline - if not
* then we must keep reading and discard until we get one.
*/
linebuf_len = strlen(linebuf);
if (linebuf[linebuf_len - 1] != '\n')
{
c = '\0';
while (!ferror(fp) && !feof(fp))
{
c = fgetc(fp);
if (c == '\n')
{
break;
}
}
}
else
{
linebuf[linebuf_len - 1] = '\0';
}
#ifdef DEBUG_PASSWORD
DEBUG(100, ("getfileline: got line |%s|\n", linebuf));
#endif
if ((linebuf[0] == 0) && feof(fp))
{
DEBUG(4, ("getfileline: end of file reached\n"));
return 0;
}
if (linebuf[0] == '#' || linebuf[0] == '\0')
{
DEBUG(6, ("getfileline: skipping comment or blank line\n"));
continue;
}
p = (unsigned char *) strchr(linebuf, ':');
if (p == NULL)
{
DEBUG(0, ("getfileline: malformed line entry (no :)\n"));
continue;
}
return linebuf_len;
}
return -1;
}
/****************************************************************************
read a line from a file with possible \ continuation chars.
Blanks at the start or end of a line are stripped.
The string will be allocated if s2 is NULL
****************************************************************************/
char *fgets_slash(char *s2,int maxlen,FILE *f)
{
char *s=s2;
int len = 0;
int c;
BOOL start_of_line = True;
if (feof(f))
return(NULL);
if (!s2)
{
maxlen = MIN(maxlen,8);
s = (char *)Realloc(s,maxlen);
}
if (!s || maxlen < 2) return(NULL);
*s = 0;
while (len < maxlen-1)
{
c = getc(f);
switch (c)
{
case '\r':
break;
case '\n':
while (len > 0 && s[len-1] == ' ')
{
s[--len] = 0;
}
if (len > 0 && s[len-1] == '\\')
{
s[--len] = 0;
start_of_line = True;
break;
}
return(s);
case EOF:
if (len <= 0 && !s2)
free(s);
return(len>0?s:NULL);
case ' ':
if (start_of_line)
break;
default:
start_of_line = False;
s[len++] = c;
s[len] = 0;
}
if (!s2 && len > maxlen-3)
{
maxlen *= 2;
s = (char *)Realloc(s,maxlen);
if (!s) return(NULL);
}
}
return(s);
}