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deb-mbse/lib/mbfile.c

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/*****************************************************************************
*
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* $Id$
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* Purpose ...............: Basic File I/O
*
*****************************************************************************
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* Copyright (C) 1997-2005
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*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This toolkit 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, or (at your option) any
* later version.
*
* MBSE BBS 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 MBTOOL; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include "mbselib.h"
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/*
* Buffered file copy, filetime is preserved.
*/
int file_cp(char *from, char *to)
{
char *line;
FILE *stfrom, *stto;
int dummy, bread;
static int error;
struct stat sb;
struct utimbuf ut;
stfrom = fopen(from, "r");
if (stfrom == NULL)
return errno;
stto = fopen(to, "w");
if (stto == NULL) {
error = errno;
fclose(stfrom);
return error;
}
line = malloc(16384);
do {
bread = fread(line, 1, 16384, stfrom);
dummy = fwrite(line, 1, bread, stto);
if (bread != dummy) {
error = errno;
fclose(stfrom);
fclose(stto);
unlink(to);
free(line);
return error;
}
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Nopper(); // For large files on slow systems
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} while (bread != 0);
free(line);
fclose(stfrom);
if (fclose(stto) != 0) {
error = errno;
unlink(to);
return error;
}
/*
* copy successfull, now copy file- and modification-time
*/
if (stat(from, &sb) == 0) {
ut.actime = mktime(localtime(&sb.st_atime));
ut.modtime = mktime(localtime(&sb.st_mtime));
if (utime(to, &ut) != 0) {
error = errno;
unlink(to);
return error;
}
chmod(to, sb.st_mode);
}
return 0;
}
/*
* Remove a file
*/
int file_rm(char *path)
{
if (unlink(path) != 0)
return errno;
return 0;
}
/*
* Move or rename a file. Not fullproof if using NFS, see
* man 2 rename. If we are trying to move a file accross
* filesystems, which is not allowed, we fall back to simple
* copy the file and then delete the old file.
*/
int file_mv(char *oldpath, char *newpath)
{
static int error;
if (rename(oldpath, newpath) != 0) {
error = errno;
if (error != EXDEV)
return error;
/*
* We tried cross-device link, now the slow way :-)
*/
error = file_cp(oldpath, newpath);
if (error != 0)
return error;
error = file_rm(oldpath);
return 0;
}
return 0;
}
/*
* Test if the given file exists. The second option is:
* R_OK - test for Read rights
* W_OK - test for Write rights
* X_OK - test for eXecute rights
* F_OK - test file presence only
*/
int file_exist(char *path, int mode)
{
if (access(path, mode) != 0)
return errno;
return 0;
}
/*
* Return size of file, or -1 if file doesn't exist
*/
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int file_size(char *path)
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{
static struct stat sb;
if (stat(path, &sb) == -1)
return -1;
return sb.st_size;
}
/*
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* Calculate the 32 bit CRC of a file. Return -1 if file not found.
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*/
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int file_crc(char *path, int slow)
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{
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static int crc;
int bread;
FILE *fp;
char *line;
if ((fp = fopen(path, "r")) == NULL)
return -1;
line = malloc(32768);
crc = 0xffffffff;
do {
bread = fread(line, 1, 32768, fp);
crc = upd_crc32(line, crc, bread);
Nopper(); // For large files on slow systems.
} while (bread > 0);
free(line);
fclose(fp);
return crc ^ 0xffffffff;
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}
/*
* Return time of file, or -1 if file doen't exist, which is
* the same as 1 second before 1 jan 1970. You may test the
* result on -1 since time_t is actualy a long integer.
*/
time_t file_time(char *path)
{
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static struct stat sb;
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if (stat(path, &sb) == -1)
return -1;
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return sb.st_mtime;
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}
/*
* Make directory tree, the name must end with a /
*/
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int mkdirs(char *name, mode_t mode)
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{
char buf[PATH_MAX], *p, *q;
int rc, last = 0, oldmask;
memset(&buf, 0, sizeof(buf));
strncpy(buf, name, sizeof(buf)-1);
buf[sizeof(buf)-1] = '\0';
p = buf+1;
oldmask = umask(000);
while ((q = strchr(p, '/'))) {
*q = '\0';
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rc = mkdir(buf, mode);
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last = errno;
*q = '/';
p = q+1;
}
umask(oldmask);
if ((last == 0) || (last == EEXIST)) {
return TRUE;
} else {
WriteError("$mkdirs(%s)", name);
return FALSE;
}
}
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/*
* Give a directory path and a filename, locate that filename in that
* directory and return the filename with the correct case. This is
* to be able to detect filename.ext, FILENAME.EXT and FiLeNaMe.ExT
*/
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int getfilecase(char *path, char *fil)
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{
DIR *dp;
struct dirent *de;
int i, rc = FALSE;
if ((dp = opendir(path)) == NULL) {
WriteError("$Can't opendir(%s)", path);
return rc;
}
while ((de = readdir(dp))) {
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if (strcasecmp(de->d_name, fil) == 0) {
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for (i = 0; i < strlen(de->d_name); i++)
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fil[i] = de->d_name[i];
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rc = TRUE;
break;
}
}
closedir(dp);
return rc;
}