317 lines
6.2 KiB
C
317 lines
6.2 KiB
C
/*****************************************************************************
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*
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* File ..................: mbfile
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* Purpose ...............: Basic File I/O
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* Last modification date : 12-Aug-2001
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*
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*****************************************************************************
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* Copyright (C) 1997-2001
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This toolkit is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBTOOL; see the file COPYING. If not, write to the Free
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* Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*****************************************************************************/
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#include "libs.h"
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#include "structs.h"
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#include "clcomm.h"
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#include "common.h"
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/*
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* Buffered file copy, filetime is preserved.
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*/
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int file_cp(char *from, char *to)
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{
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char *line;
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FILE *stfrom, *stto;
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int dummy, bread;
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static int error;
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struct stat sb;
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struct utimbuf ut;
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stfrom = fopen(from, "r");
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if (stfrom == NULL)
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return errno;
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stto = fopen(to, "w");
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if (stto == NULL) {
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error = errno;
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fclose(stfrom);
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return error;
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}
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line = malloc(16384);
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do {
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bread = fread(line, 1, 16384, stfrom);
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dummy = fwrite(line, 1, bread, stto);
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if (bread != dummy) {
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error = errno;
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fclose(stfrom);
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fclose(stto);
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unlink(to);
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free(line);
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return error;
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}
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} while (bread != 0);
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free(line);
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fclose(stfrom);
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if (fclose(stto) != 0) {
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error = errno;
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unlink(to);
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return error;
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}
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/*
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* copy successfull, now copy file- and modification-time
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*/
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if (stat(from, &sb) == 0) {
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ut.actime = mktime(localtime(&sb.st_atime));
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ut.modtime = mktime(localtime(&sb.st_mtime));
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if (utime(to, &ut) != 0) {
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error = errno;
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unlink(to);
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return error;
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}
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chmod(to, sb.st_mode);
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}
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return 0;
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}
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/*
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* Remove a file
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*/
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int file_rm(char *path)
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{
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if (unlink(path) != 0)
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return errno;
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return 0;
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}
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/*
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* Move or rename a file. Not fullproof if using NFS, see
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* man 2 rename. If we are trying to move a file accross
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* filesystems, which is not allowed, we fall back to simple
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* copy the file and then delete the old file.
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*/
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int file_mv(char *oldpath, char *newpath)
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{
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static int error;
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if (rename(oldpath, newpath) != 0) {
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error = errno;
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if (error != EXDEV)
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return error;
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/*
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* We tried cross-device link, now the slow way :-)
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*/
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error = file_cp(oldpath, newpath);
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if (error != 0)
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return error;
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error = file_rm(oldpath);
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return 0;
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}
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return 0;
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}
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/*
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* Test if the given file exists. The second option is:
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* R_OK - test for Read rights
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* W_OK - test for Write rights
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* X_OK - test for eXecute rights
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* F_OK - test file presence only
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*/
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int file_exist(char *path, int mode)
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{
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if (access(path, mode) != 0)
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return errno;
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return 0;
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}
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/*
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* Return size of file, or -1 if file doesn't exist
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*/
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long file_size(char *path)
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{
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static struct stat sb;
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if (stat(path, &sb) == -1)
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return -1;
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return sb.st_size;
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}
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/*
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* Claclulate the 32 bit CRC of a file. Return -1 if file not found.
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*/
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long file_crc(char *path, int slow)
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{
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static long crc;
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int bread;
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FILE *fp;
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char *line;
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if ((fp = fopen(path, "r")) == NULL)
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return -1;
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line = malloc(32768);
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crc = 0xffffffff;
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do {
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bread = fread(line, 1, 32768, fp);
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crc = upd_crc32(line, crc, bread);
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if (slow)
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usleep(1);
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} while (bread > 0);
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free(line);
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fclose(fp);
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return crc ^ 0xffffffff;
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}
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/*
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* Return time of file, or -1 if file doen't exist, which is
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* the same as 1 second before 1 jan 1970. You may test the
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* result on -1 since time_t is actualy a long integer.
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*/
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time_t file_time(char *path)
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{
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static struct stat sb;
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if (stat(path, &sb) == -1)
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return -1;
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return sb.st_mtime;
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}
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/*
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* Make directory tree, the name must end with a /
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*/
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int mkdirs(char *name)
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{
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char buf[PATH_MAX], *p, *q;
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int rc, last = 0, oldmask;
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memset(&buf, 0, sizeof(buf));
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strncpy(buf, name, sizeof(buf)-1);
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buf[sizeof(buf)-1] = '\0';
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p = buf+1;
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oldmask = umask(000);
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while ((q = strchr(p, '/'))) {
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*q = '\0';
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rc = mkdir(buf, 0775);
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last = errno;
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*q = '/';
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p = q+1;
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}
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umask(oldmask);
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if ((last == 0) || (last == EEXIST)) {
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return TRUE;
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} else {
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WriteError("$mkdirs(%s)", name);
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return FALSE;
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}
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}
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/*
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* Check free diskspace on most filesystems. Exclude check on floppyies,
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* CD's and /boot partition. The amount of needed space is given in MBytes.
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* Currently only Linux is supported.
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*/
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int diskfree(int needed)
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{
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#ifdef __linux__
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char *mtab, *dev, *fs, *type;
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FILE *fp;
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struct statfs sfs;
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int RetVal = TRUE;
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unsigned long temp;
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#endif
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#ifdef __linux__
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if (! needed)
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return TRUE;
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mtab = calloc(PATH_MAX, sizeof(char));
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if ((fp = fopen((char *)"/etc/mtab", "r")) == 0) {
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WriteError("$Can't open /etc/mtab");
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return TRUE;
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}
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while (fgets(mtab, PATH_MAX, fp)) {
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dev = strtok(mtab, " ");
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fs = strtok(NULL, " ");
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type = strtok(NULL, " ");
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if (strncmp((char *)"/dev/", dev, 5) == 0) {
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/*
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* Filter out unwanted filesystems, floppy.
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* Also filter out the /boot file system.
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*/
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if (strncmp((char *)"/dev/fd", dev, 7) && strncmp((char *)"/boot", fs, 5) &&
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(!strncmp((char *)"ext2", type, 4) || !strncmp((char *)"reiserfs", type, 8) ||
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!strncmp((char *)"ufs", type, 3) ||
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!strncmp((char *)"vfat", type, 4) || !strncmp((char *)"msdos", type, 5))) {
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if (statfs(fs, &sfs) == 0) {
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temp = (unsigned long)(sfs.f_bsize / 512L);
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if (((unsigned long)(sfs.f_bavail * temp) / 2048L) < needed) {
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RetVal = FALSE;
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WriteError("On \"%s\" only %d kb left, need %d kb", fs,
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(sfs.f_bavail * sfs.f_bsize) / 1024, needed * 1024);
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}
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}
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}
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}
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}
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fclose(fp);
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free(mtab);
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return RetVal;
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#else /* ifdef __linux__ */
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return TRUE; /* Assume enough */
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#endif
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}
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