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/*
* getparts.c - functions associated with getting partitions for a disk
*
* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Red Hat, Inc.
* All rights reserved.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Author(s): Michael Fulbright <msf@redhat.com>
* Jeremy Katz <katzj@redhat.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include "log.h"
/* see if this is a partition name or not */
static int isPartitionName(char *pname) {
/* if it doesnt start with a alpha its not one */
if (!isalpha(*pname) || strstr(pname, "ram"))
return 0;
/* if it has a '/' in it then treat it specially */
if (strchr(pname, '/') && !strstr(pname, "iseries") &&
!strstr(pname, "i2o")) {
/* assume its either a /dev/ida/ or /dev/cciss device */
/* these have form of c?d?p? if its a partition */
return strchr(pname, 'p') != NULL;
} else {
/* if it ends with a digit we're ok */
return isdigit(pname[strlen(pname)-1]);
}
}
/* return NULL terminated array of pointers to names of partitons in
* /proc/partitions
*/
char **getPartitionsList(char * disk) {
FILE *f;
int numfound = 0;
char **rc=NULL;
f = fopen("/proc/partitions", "r");
if (!f) {
logMessage(ERROR, "getPartitionsList: could not open /proc/partitions");
return NULL;
}
/* read through /proc/partitions and parse out partitions */
while (1) {
char *tmpptr, *pptr;
char tmpstr[4096];
tmpptr = fgets(tmpstr, sizeof(tmpstr), f);
if (tmpptr) {
char *a, *b;
int toknum = 0;
a = tmpstr;
while (1) {
b = strsep(&a, " \n");
/* if no fields left abort */
if (!b)
break;
/* if field was empty means we hit another delimiter */
if (!*b)
continue;
/* make sure this is a valid partition line, should start */
/* with a numeral */
if (toknum == 0) {
if (!isdigit(*b))
break;
} else if (toknum == 2) {
/* if size is exactly 1 then ignore it as an extended */
if (!strcmp(b, "1"))
break;
} else if (toknum == 3) {
/* this should be the partition name */
/* now we need to see if this is the block device or */
/* actually a partition name */
if (!isPartitionName(b))
break;
/* make sure that either we don't care about the disk
* or it's this one */
if ((disk != NULL) && (strncmp(disk, b, strlen(disk))))
break;
/* we found a partition! */
pptr = (char *) malloc(strlen(b) + 7);
sprintf(pptr, "/dev/%s", b);
if (!rc) {
rc = (char **) malloc(2*sizeof(char *));
rc[0] = pptr;
rc[1] = NULL;
} else {
int idx;
rc = (char **) realloc(rc, (numfound+2)*sizeof(char *));
idx = 0;
while (idx < numfound) {
if (strcmp(pptr, rc[idx]) < 0)
break;
idx++;
}
/* move existing out of way if necessary */
if (idx != numfound)
memmove(rc+idx+1, rc+idx, (numfound-idx)*sizeof(char *));
rc[idx] = pptr;
rc[numfound+1] = NULL;
}
numfound++;
break;
}
toknum++;
}
} else {
break;
}
}
fclose(f);
return rc;
}
/* returns length of partitionlist */
int lenPartitionsList(char **list) {
char **part;
int rc;
if (!list) return 0;
for (rc = 0, part = list; *part; rc++, part++);
return rc;
}
/* frees partition list */
void freePartitionsList(char **list) {
char **part;
if (!list)
return;
for (part = list; *part; part++) {
if (*part) {
free(*part);
*part = NULL;
}
}
free(list);
list = NULL;
}
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