qubes-installer-qubes-os/loader/moduleinfo.c
2011-01-18 04:24:57 -05:00

277 lines
8.9 KiB
C

/*
* moduleinfo.c - module info functionality
*
* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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): Erik Troan <ewt@redhat.com>
* Matt Wilson <msw@redhat.com>
*/
#include <alloca.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include "moduleinfo.h"
struct moduleInfo * getModuleList(moduleInfoSet mis,
enum driverMajor major) {
struct moduleInfo * miList, * next;
int i;
next = miList = malloc(sizeof(*miList) * mis->numModules + 1);
for (i = 0; i < mis->numModules; i++) {
if (mis->moduleList[i].major == major || major == DRIVER_NONE) {
*next = mis->moduleList[i];
next++;
}
}
if (next == miList) {
free(next);
return NULL;
}
next->moduleName = NULL;
next++;
miList = realloc(miList, sizeof(*miList) * (next - miList));
return miList;
}
struct moduleInfo * findModuleInfo(moduleInfoSet mis,
const char * moduleName) {
int i;
struct moduleInfo * found = NULL;
for (i = 0; i < mis->numModules; i++) {
if (!strcmp(moduleName, mis->moduleList[i].moduleName)) {
if (!found)
found = mis->moduleList + i;
else if (found->locationID && !mis->moduleList[i].locationID)
;
else
found = mis->moduleList + i;
}
}
return found;
}
moduleInfoSet newModuleInfoSet(void) {
return calloc(sizeof(struct moduleInfoSet_s), 1);
}
/* filename: file to read module-info from
* mis: moduleInfoSet
* location: moduleBallLocation struct describing the location of
* these modules. (may be NULL)
* override: 1 if modules from this module ball should override old ones
* of the same name.
*/
int readModuleInfo(const char * filename, moduleInfoSet mis,
void * location, int override) {
int fd, isIndented;
char * buf, * start, * next = NULL, * chptr;
struct stat sb;
char oldch;
struct moduleInfo * nextModule;
int modulesAlloced;
int i;
int found = 0, skipModule = 0;
fd = open(filename, O_RDONLY);
if (fd < 0) return -1;
fstat(fd, &sb);
buf = alloca(sb.st_size + 1);
i = read(fd, buf, sb.st_size);
buf[sb.st_size] = '\0';
close(fd);
if (i != sb.st_size)
return -1;
nextModule = NULL;
modulesAlloced = mis->numModules;
if (strncmp(buf, "Version 0\n", 10)) return -1;
start = buf + 10;
while (start && *start) {
chptr = strchr(start, '\n');
if (chptr) {
/* slice and dice */
next = chptr + 1;
} else {
chptr += strlen(start) - 1;
}
chptr--;
while (isspace(*chptr)) chptr--;
chptr++;
*chptr = '\0';
isIndented = 0;
if (isspace(*start)) {
while (isspace(*start) && *start != '\n') start++;
isIndented = 1;
}
if (*start != '\n' && *start && *start != '#') {
if (!isIndented) {
if (nextModule && nextModule->moduleName &&
nextModule == (mis->moduleList + mis->numModules)) {
mis->numModules++;
}
if (mis->numModules == modulesAlloced) {
modulesAlloced += 5;
mis->moduleList = realloc(mis->moduleList,
modulesAlloced * sizeof(*mis->moduleList));
}
nextModule = NULL;
found = 0;
skipModule = 0;
for (i = 0; i < mis->numModules; i++) {
if (!strcmp(mis->moduleList[i].moduleName, start)) {
if (override)
nextModule = mis->moduleList + i;
else
skipModule = 1;
found = 1;
break;
}
}
if (!found && !nextModule) {
nextModule = mis->moduleList + mis->numModules;
nextModule->moduleName = strdup(start);
}
if (nextModule) {
nextModule->major = DRIVER_NONE;
nextModule->minor = DRIVER_MINOR_NONE;
nextModule->description = NULL;
nextModule->flags = 0;
nextModule->args = NULL;
nextModule->numArgs = 0;
nextModule->locationID = location;
}
} else if (!nextModule && skipModule) {
/* we're skipping this one (not overriding), do nothing */
} else if (!nextModule && skipModule) {
/* ACK! syntax error */
fprintf(stderr, "module-info syntax error in %s\n", filename);
return 1;
} else if (nextModule->major == DRIVER_NONE) {
chptr = start + strlen(start) - 1;
while (!isspace(*chptr) && chptr > start) chptr--;
if (chptr != start) chptr++;
if (!strcmp(chptr, "eth")) {
nextModule->major = DRIVER_NET;
nextModule->minor = DRIVER_MINOR_ETHERNET;
} else if (!strcmp(chptr, "tr")) {
nextModule->major = DRIVER_NET;
nextModule->minor = DRIVER_MINOR_TR;
} else if (!strcmp(chptr, "scsi_hostadapter") ||
!strcmp(chptr, "scsi")) {
nextModule->major = DRIVER_SCSI;
} else if (!strcmp(chptr, "pcmcia")) {
nextModule->major = DRIVER_PCMCIA;
} else if (!strcmp(chptr, "fs")) {
nextModule->major = DRIVER_FS;
} else if (!strcmp(chptr, "cdrom")) {
nextModule->major = DRIVER_CDROM;
} else if (!strcmp(chptr, "ide")) {
nextModule->major = DRIVER_IDE;
} else {
nextModule->major = DRIVER_OTHER;
}
} else if (!nextModule->description) {
chptr = start + strlen(start) - 1;
if (*start == '"' && *chptr == '"') {
start++;
*chptr = '\0';
nextModule->description = strdup(start);
}
} else {
nextModule->args = realloc(nextModule->args,
sizeof(*nextModule->args) * (nextModule->numArgs + 1));
chptr = start;
while (!isspace(*chptr) && *chptr) chptr++;
if (*chptr) {
oldch = *chptr;
*chptr = '\0';
nextModule->args[nextModule->numArgs].arg = strdup(start);
start = chptr + 1;
while (*start && isspace(*start)) start++;
if (*start == '"') {
start++;
chptr = strchr(start, '"');
if (chptr) {
*chptr = '\0';
nextModule->args[nextModule->numArgs].description =
strdup(start);
nextModule->numArgs++;
}
}
}
}
}
start = next;
}
/* do we need to add in this last module? */
if (nextModule && ((nextModule - mis->moduleList) == mis->numModules))
mis->numModules++;
return 0;
}
void freeModuleInfoSet(moduleInfoSet mis) {
int i, j;
for (i = 0; i < mis->numModules; i++) {
if (mis->moduleList[i].moduleName)
free(mis->moduleList[i].moduleName);
if (mis->moduleList[i].description)
free(mis->moduleList[i].description);
for (j = 0; i < mis->moduleList[i].numArgs; j++) {
if (mis->moduleList[i].args[j].arg)
free(mis->moduleList[i].args[j].arg) ;
if (mis->moduleList[i].args[j].description)
free(mis->moduleList[i].args[j].description) ;
}
}
free(mis);
}