GeezerVison is showing github.com — mmc-utils/mmc.c at master · Hashcode/mmc-utils

Expand file tree

mmc.c

Copy path

More file actions

Latest commit

History

388 lines (333 loc) · 9.5 KB

mmc.c

Copy path

File metadata and controls

388 lines (333 loc) · 9.5 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public

* License v2 as published by the Free Software Foundation.

* 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, write to the

* Free Software Foundation, Inc., 59 Temple Place - Suite 330,

* Boston, MA 021110-1307, USA.

* (This code is based on btrfs-progs/btrfs.c.)

#define _GNU_SOURCE

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "mmc_cmds.h"

#define MMC_VERSION "0.1"

#define BASIC_HELP 0

#define ADVANCED_HELP 1

typedef int (*CommandFunction)(int argc, char **argv);

struct Command {

CommandFunction func; /* function which implements the command */

int nargs; /* if == 999, any number of arguments

if >= 0, number of arguments,

if < 0, _minimum_ number of arguments */

char *verb; /* verb */

char *help; /* help lines; from the 2nd line onward they

are automatically indented */

char *adv_help; /* advanced help message; from the 2nd line

onward they are automatically indented */

/* the following fields are run-time filled by the program */

char **cmds; /* array of subcommands */

int ncmds; /* number of subcommand */

};

static struct Command commands[] = {

* avoid short commands different for the case only

{ do_read_extcsd, -1,

"extcsd read", "<device>\n"

"Print extcsd data from <device>.",

NULL

{ do_writeprotect_get, -1,

"writeprotect get", "<device>\n"

"Determine the eMMC writeprotect status of <device>.",

NULL

{ do_writeprotect_set, -1,

"writeprotect set", "<device>\n"

"Set the eMMC writeprotect status of <device>.\nThis sets the eMMC to be write-protected until next boot.",

NULL

{ do_disable_512B_emulation, -1,

"disable 512B emulation", "<device>\n"

"Set the eMMC data sector size to 4KB by disabling emulation on\n<device>.",

NULL

{ do_enh_area_set, -4,

"enh_area set", "<-y|-n> " "<start KiB> " "<length KiB> " "<device>\n"

"Enable the enhanced user area for the <device>.\nDry-run only unless -y is passed.\nNOTE! This is a one-time programmable (unreversible) change.",

NULL

{ do_status_get, -1,

"status get", "<device>\n"

"Print the response to STATUS_SEND (CMD13).",

NULL

{ do_write_boot_en, -3,

"bootpart enable", "<boot_partition> " "<send_ack> " "<device>\n"

"Enable the boot partition for the <device>.\nTo receive acknowledgment of boot from the card set <send_ack>\nto 1, else set it to 0.",

NULL

{ do_write_bkops_en, -1,

"bkops enable", "<device>\n"

"Enable the eMMC BKOPS feature on <device>.\nNOTE! This is a one-time programmable (unreversible) change.",

NULL

{ do_hwreset_en, -1,

"hwreset enable", "<device>\n"

"Permanently enable the eMMC H/W Reset feature on <device>.\nNOTE! This is a one-time programmable (unreversible) change.",

NULL

{ do_hwreset_dis, -1,

"hwreset disable", "<device>\n"

"Permanently disable the eMMC H/W Reset feature on <device>.\nNOTE! This is a one-time programmable (unreversible) change.",

NULL

{ do_sanitize, -1,

"sanitize", "<device>\n"

"Send Sanitize command to the <device>.\nThis will delete the unmapped memory region of the device.",

NULL

{ do_vendor_cmd, -2,

"vendor", "<arg> " "<device>\n"

"Send CMD62 bootsize <arg> command to the <device>.\nUsed for various Samsung moviNAND cmds.",

NULL

{ 0, 0, 0, 0 }

};

static char *get_prgname(char *programname)

{

char *np;

np = strrchr(programname,'/');

if(!np)

np = programname;

else

np++;

return np;

}

static void print_help(char *programname, struct Command *cmd, int helptype)

{

char *pc;

printf("\t%s %s ", programname, cmd->verb );

if (helptype == ADVANCED_HELP && cmd->adv_help)

for(pc = cmd->adv_help; *pc; pc++){

putchar(*pc);

if(*pc == '\n')

printf("\t\t");

}

else

for(pc = cmd->help; *pc; pc++){

putchar(*pc);

if(*pc == '\n')

printf("\t\t");

}

putchar('\n');

}

static void help(char *np)

{

struct Command *cp;

printf("Usage:\n");

for( cp = commands; cp->verb; cp++ )

print_help(np, cp, BASIC_HELP);

printf("\n\t%s help|--help|-h\n\t\tShow the help.\n",np);

printf("\n\t%s <cmd> --help\n\t\tShow detailed help for a command or subset of commands.\n",np);

printf("\n%s\n", MMC_VERSION);

}

static int split_command(char *cmd, char ***commands)

{

int c, l;

char *p, *s;

for( *commands = 0, l = c = 0, p = s = cmd ; ; p++, l++ ){

if ( *p && *p != ' ' )

continue;

/* c + 2 so that we have room for the null */

(*commands) = realloc( (*commands), sizeof(char *)*(c + 2));

(*commands)[c] = strndup(s, l);

c++;

l = 0;

s = p+1;

if( !*p ) break;

}

(*commands)[c] = 0;

return c;

}

This function checks if the passed command is ambiguous

static int check_ambiguity(struct Command *cmd, char **argv){

int i;

struct Command *cp;

/* check for ambiguity */

for( i = 0 ; i < cmd->ncmds ; i++ ){

int match;

for( match = 0, cp = commands; cp->verb; cp++ ){

int j, skip;

char *s1, *s2;

if( cp->ncmds < i )

continue;

for( skip = 0, j = 0 ; j < i ; j++ )

if( strcmp(cmd->cmds[j], cp->cmds[j])){

skip=1;

break;

}

if(skip)

continue;

if( !strcmp(cmd->cmds[i], cp->cmds[i]))

continue;

for(s2 = cp->cmds[i], s1 = argv[i+1];

*s1 == *s2 && *s1; s1++, s2++ ) ;

if( !*s1 )

match++;

}

if(match){

int j;

fprintf(stderr, "ERROR: in command '");

for( j = 0 ; j <= i ; j++ )

fprintf(stderr, "%s%s",j?" ":"", argv[j+1]);

fprintf(stderr, "', '%s' is ambiguous\n",argv[j]);

return -2;

}

return 0;

}

* This function, compacts the program name and the command in the first

* element of the '*av' array

static int prepare_args(int *ac, char ***av, char *prgname, struct Command *cmd ){

char **ret;

int i;

char *newname;

ret = (char **)malloc(sizeof(char*)*(*ac+1));

newname = (char*)malloc(strlen(prgname)+strlen(cmd->verb)+2);

if( !ret || !newname ){

free(ret);

free(newname);

return -1;

}

ret[0] = newname;

for(i=0; i < *ac ; i++ )

ret[i+1] = (*av)[i];

strcpy(newname, prgname);

strcat(newname, " ");

strcat(newname, cmd->verb);

(*ac)++;

*av = ret;

return 0;

}

This function performs the following jobs:

- show the help if '--help' or 'help' or '-h' are passed

- verify that a command is not ambiguous, otherwise show which

part of the command is ambiguous

- if after a (even partial) command there is '--help' show detailed help

for all the matching commands

- if the command doesn't match show an error

- finally, if a command matches, they return which command matched and

the arguments

The function return 0 in case of help is requested; <0 in case

of uncorrect command; >0 in case of matching commands

argc, argv are the arg-counter and arg-vector (input)

*nargs_ is the number of the arguments after the command (output)

**cmd_ is the invoked command (output)

***args_ are the arguments after the command

static int parse_args(int argc, char **argv,

CommandFunction *func_,

int *nargs_, char **cmd_, char ***args_ )

{

struct Command *cp;

struct Command *matchcmd=0;

char *prgname = get_prgname(argv[0]);

int i=0, helprequested=0;

if( argc < 2 || !strcmp(argv[1], "help") ||

!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")){

help(prgname);

return 0;

}

for( cp = commands; cp->verb; cp++ )

if( !cp->ncmds)

cp->ncmds = split_command(cp->verb, &(cp->cmds));

for( cp = commands; cp->verb; cp++ ){

int match;

if( argc-1 < cp->ncmds )

continue;

for( match = 1, i = 0 ; i < cp->ncmds ; i++ ){

char *s1, *s2;

s1 = cp->cmds[i];

s2 = argv[i+1];

for(s2 = cp->cmds[i], s1 = argv[i+1];

*s1 == *s2 && *s1;

s1++, s2++ ) ;

if( *s1 ){

match=0;

break;

}

/* If you understand why this code works ...

you are a genious !! */

if(argc>i+1 && !strcmp(argv[i+1],"--help")){

if(!helprequested)

printf("Usage:\n");

print_help(prgname, cp, ADVANCED_HELP);

helprequested=1;

continue;

}

if(!match)

continue;

matchcmd = cp;

*nargs_ = argc-matchcmd->ncmds-1;

*cmd_ = matchcmd->verb;

*args_ = argv+matchcmd->ncmds+1;

*func_ = cp->func;

break;

}

if(helprequested){

printf("\n%s\n", MMC_VERSION);

return 0;

}

if(!matchcmd){

fprintf( stderr, "ERROR: unknown command '%s'\n",argv[1]);

help(prgname);

return -1;

}

if(check_ambiguity(matchcmd, argv))

return -2;

/* check the number of argument */

if (matchcmd->nargs < 0 && matchcmd->nargs < -*nargs_ ){

fprintf(stderr, "ERROR: '%s' requires minimum %d arg(s)\n",

matchcmd->verb, -matchcmd->nargs);

return -2;

}

if(matchcmd->nargs >= 0 && matchcmd->nargs != *nargs_ && matchcmd->nargs != 999){

fprintf(stderr, "ERROR: '%s' requires %d arg(s)\n",

matchcmd->verb, matchcmd->nargs);

return -2;

}

if (prepare_args( nargs_, args_, prgname, matchcmd )){

fprintf(stderr, "ERROR: not enough memory\\n");

return -20;

}

return 1;

}

int main(int ac, char **av )

{

char *cmd=0, **args=0;

int nargs=0, r;

CommandFunction func=0;

r = parse_args(ac, av, &func, &nargs, &cmd, &args);

if( r <= 0 ){

/* error or no command to parse*/

exit(-r);

}

exit(func(nargs, args));

}