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/*
* lib/part/open.c
*
* Copyright (C) 1997,1998 Russell King
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "util/debug.h"
#include "util/error.h"
#include "part/part.h"
static scheme_t *schemes[] = {
&eesox_scheme,
&icside_scheme,
&powertec_scheme,
&filecore_linux_scheme,
&filecore_riscix_scheme,
&pcbios_scheme,
NULL
};
/* Prototype: part_t *part_open (const char *dev_name, const char *part_scheme)
* Function : Open a device.
* Params : dev_name - OS specific device name
* : part_scheme - partitioning scheme
* Returns : pointer to part_t structure
* Notes : Reads all partitioning data on the drive
*/
part_t *part_open(const char *dev_name, const char *part_scheme)
{
part_t *part = NULL;
assert(dev_name != NULL);
dbg_printf("part_open(dev_name=%s, part_scheme=%s)", dev_name,
part_scheme ? part_scheme : "");
dbg_level_up();
do {
scheme_t *scheme;
part = malloc(sizeof (part_t));
if (!part) {
set_error("out of memory");
break;
}
memset(part, 0, sizeof (part_t));
/*
* open the device
*/
part->blkio = blkio_open(dev_name);
if (!part->blkio) {
free(part);
part = NULL;
break;
}
/*
* Detect partitioning scheme
*/
if (!part_scheme) {
scheme_t **sp;
/* detect scheme */
for (sp = schemes; (scheme = *sp) != NULL; sp++)
if (scheme->detect(part))
break;
} else {
scheme_t **sp;
u_int scheme_len = strlen (part_scheme);
u_int matches = 0;
/* find named scheme */
for (sp = schemes; (scheme = *sp) != NULL; sp++)
if (strncasecmp(scheme->name, part_scheme, scheme_len) == 0) {
matches ++;
if (scheme->detect(part))
break;
}
if (!scheme && matches == 1) {
for (sp = schemes; (scheme = *sp) != NULL; sp++)
if (strncasecmp(scheme->name, part_scheme, scheme_len) == 0)
break;
}
}
if (!scheme) {
blkio_close(part->blkio);
free(part);
part = NULL;
set_error("partitioning scheme not recognised");
break;
}
/*
* read partition data
*/
if (!scheme->readinfo(part)) {
blkio_close (part->blkio);
free(part);
part = NULL;
set_error("unable to read partition tables");
break;
}
part->scheme = scheme;
} while(0);
dbg_level_down();
dbg_printf("ret=%p", part);
return part;
}
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