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Add 9P2000.u functions.
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  1 d3df3087 2003-12-06 devnull #include	<u.h>

  2 d3df3087 2003-12-06 devnull #include	<libc.h>

  3 d3df3087 2003-12-06 devnull #include	<fcall.h>

  4 d3df3087 2003-12-06 devnull 

  5 d3df3087 2003-12-06 devnull static

  6 d3df3087 2003-12-06 devnull uchar*

  7 d3df3087 2003-12-06 devnull gstring(uchar *p, uchar *ep, char **s)

  8 d3df3087 2003-12-06 devnull {

  9 d3df3087 2003-12-06 devnull 	uint n;

 10 d3df3087 2003-12-06 devnull 

 11 d3df3087 2003-12-06 devnull 	if(p+BIT16SZ > ep)

 12 d3df3087 2003-12-06 devnull 		return nil;

 13 d3df3087 2003-12-06 devnull 	n = GBIT16(p);

 14 d3df3087 2003-12-06 devnull 	p += BIT16SZ - 1;

 15 d3df3087 2003-12-06 devnull 	if(p+n+1 > ep)

 16 d3df3087 2003-12-06 devnull 		return nil;

 17 d3df3087 2003-12-06 devnull 	/* move it down, on top of count, to make room for '\0' */

 18 d3df3087 2003-12-06 devnull 	memmove(p, p + 1, n);

 19 d3df3087 2003-12-06 devnull 	p[n] = '\0';

 20 d3df3087 2003-12-06 devnull 	*s = (char*)p;

 21 d3df3087 2003-12-06 devnull 	p += n+1;

 22 d3df3087 2003-12-06 devnull 	return p;

 23 d3df3087 2003-12-06 devnull }

 24 d3df3087 2003-12-06 devnull 

 25 d3df3087 2003-12-06 devnull static

 26 d3df3087 2003-12-06 devnull uchar*

 27 d3df3087 2003-12-06 devnull gqid(uchar *p, uchar *ep, Qid *q)

 28 d3df3087 2003-12-06 devnull {

 29 d3df3087 2003-12-06 devnull 	if(p+QIDSZ > ep)

 30 d3df3087 2003-12-06 devnull 		return nil;

 31 d3df3087 2003-12-06 devnull 	q->type = GBIT8(p);

 32 d3df3087 2003-12-06 devnull 	p += BIT8SZ;

 33 d3df3087 2003-12-06 devnull 	q->vers = GBIT32(p);

 34 d3df3087 2003-12-06 devnull 	p += BIT32SZ;

 35 d3df3087 2003-12-06 devnull 	q->path = GBIT64(p);

 36 d3df3087 2003-12-06 devnull 	p += BIT64SZ;

 37 d3df3087 2003-12-06 devnull 	return p;

 38 d3df3087 2003-12-06 devnull }

 39 d3df3087 2003-12-06 devnull 

 40 d3df3087 2003-12-06 devnull /*

 41 d3df3087 2003-12-06 devnull  * no syntactic checks.

 42 d3df3087 2003-12-06 devnull  * three causes for error:

 43 d3df3087 2003-12-06 devnull  *  1. message size field is incorrect

 44 d3df3087 2003-12-06 devnull  *  2. input buffer too short for its own data (counts too long, etc.)

 45 d3df3087 2003-12-06 devnull  *  3. too many names or qids

 46 d3df3087 2003-12-06 devnull  * gqid() and gstring() return nil if they would reach beyond buffer.

 47 d3df3087 2003-12-06 devnull  * main switch statement checks range and also can fall through

 48 d3df3087 2003-12-06 devnull  * to test at end of routine.

 49 d3df3087 2003-12-06 devnull  */

 50 d3df3087 2003-12-06 devnull uint

 51 fb941e08 2005-09-13 devnull convM2Su(uchar *ap, uint nap, Fcall *f, int dotu)

 52 d3df3087 2003-12-06 devnull {

 53 d3df3087 2003-12-06 devnull 	uchar *p, *ep;

 54 d3df3087 2003-12-06 devnull 	uint i, size;

 55 d3df3087 2003-12-06 devnull 

 56 d3df3087 2003-12-06 devnull 	p = ap;

 57 d3df3087 2003-12-06 devnull 	ep = p + nap;

 58 d3df3087 2003-12-06 devnull 

 59 d3df3087 2003-12-06 devnull 	if(p+BIT32SZ+BIT8SZ+BIT16SZ > ep)

 60 d3df3087 2003-12-06 devnull 		return 0;

 61 d3df3087 2003-12-06 devnull 	size = GBIT32(p);

 62 d3df3087 2003-12-06 devnull 	p += BIT32SZ;

 63 d3df3087 2003-12-06 devnull 

 64 d3df3087 2003-12-06 devnull 	if(size < BIT32SZ+BIT8SZ+BIT16SZ)

 65 d3df3087 2003-12-06 devnull 		return 0;

 66 d3df3087 2003-12-06 devnull 

 67 d3df3087 2003-12-06 devnull 	f->type = GBIT8(p);

 68 d3df3087 2003-12-06 devnull 	p += BIT8SZ;

 69 d3df3087 2003-12-06 devnull 	f->tag = GBIT16(p);

 70 d3df3087 2003-12-06 devnull 	p += BIT16SZ;

 71 d3df3087 2003-12-06 devnull 

 72 d3df3087 2003-12-06 devnull 	switch(f->type)

 73 d3df3087 2003-12-06 devnull 	{

 74 d3df3087 2003-12-06 devnull 	default:

 75 d3df3087 2003-12-06 devnull 		return 0;

 76 d3df3087 2003-12-06 devnull 

 77 d3df3087 2003-12-06 devnull 	case Tversion:

 78 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

 79 d3df3087 2003-12-06 devnull 			return 0;

 80 d3df3087 2003-12-06 devnull 		f->msize = GBIT32(p);

 81 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

 82 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->version);

 83 d3df3087 2003-12-06 devnull 		break;

 84 d3df3087 2003-12-06 devnull 

 85 d3df3087 2003-12-06 devnull 	case Tflush:

 86 d3df3087 2003-12-06 devnull 		if(p+BIT16SZ > ep)

 87 d3df3087 2003-12-06 devnull 			return 0;

 88 d3df3087 2003-12-06 devnull 		f->oldtag = GBIT16(p);

 89 d3df3087 2003-12-06 devnull 		p += BIT16SZ;

 90 d3df3087 2003-12-06 devnull 		break;

 91 d3df3087 2003-12-06 devnull 

 92 d3df3087 2003-12-06 devnull 	case Tauth:

 93 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

 94 d3df3087 2003-12-06 devnull 			return 0;

 95 d3df3087 2003-12-06 devnull 		f->afid = GBIT32(p);

 96 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

 97 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->uname);

 98 d3df3087 2003-12-06 devnull 		if(p == nil)

 99 d3df3087 2003-12-06 devnull 			break;

100 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->aname);

101 d3df3087 2003-12-06 devnull 		if(p == nil)

102 d3df3087 2003-12-06 devnull 			break;

103 d3df3087 2003-12-06 devnull 		break;

104 d3df3087 2003-12-06 devnull 

105 d3df3087 2003-12-06 devnull 	case Tattach:

106 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

107 d3df3087 2003-12-06 devnull 			return 0;

108 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);

109 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

110 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

111 d3df3087 2003-12-06 devnull 			return 0;

112 d3df3087 2003-12-06 devnull 		f->afid = GBIT32(p);

113 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

114 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->uname);

115 d3df3087 2003-12-06 devnull 		if(p == nil)

116 d3df3087 2003-12-06 devnull 			break;

117 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->aname);

118 d3df3087 2003-12-06 devnull 		if(p == nil)

119 d3df3087 2003-12-06 devnull 			break;

120 d3df3087 2003-12-06 devnull 		break;

121 d3df3087 2003-12-06 devnull 

122 d3df3087 2003-12-06 devnull 	case Twalk:

123 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT32SZ+BIT16SZ > ep)

124 d3df3087 2003-12-06 devnull 			return 0;

125 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);

126 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

127 d3df3087 2003-12-06 devnull 		f->newfid = GBIT32(p);

128 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

129 d3df3087 2003-12-06 devnull 		f->nwname = GBIT16(p);

130 d3df3087 2003-12-06 devnull 		p += BIT16SZ;

131 d3df3087 2003-12-06 devnull 		if(f->nwname > MAXWELEM)

132 d3df3087 2003-12-06 devnull 			return 0;

133 d3df3087 2003-12-06 devnull 		for(i=0; i<f->nwname; i++){

134 d3df3087 2003-12-06 devnull 			p = gstring(p, ep, &f->wname[i]);

135 d3df3087 2003-12-06 devnull 			if(p == nil)

136 d3df3087 2003-12-06 devnull 				break;

137 d3df3087 2003-12-06 devnull 		}

138 d3df3087 2003-12-06 devnull 		break;

139 d3df3087 2003-12-06 devnull 

140 d3df3087 2003-12-06 devnull 	case Topen:

141 32f69c36 2003-12-11 devnull 	case Topenfd:

142 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT8SZ > ep)

143 d3df3087 2003-12-06 devnull 			return 0;

144 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);

145 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

146 d3df3087 2003-12-06 devnull 		f->mode = GBIT8(p);

147 d3df3087 2003-12-06 devnull 		p += BIT8SZ;

148 d3df3087 2003-12-06 devnull 		break;

149 d3df3087 2003-12-06 devnull 

150 d3df3087 2003-12-06 devnull 	case Tcreate:

151 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

152 d3df3087 2003-12-06 devnull 			return 0;

153 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);

154 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

155 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->name);

156 d3df3087 2003-12-06 devnull 		if(p == nil)

157 d3df3087 2003-12-06 devnull 			break;

158 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT8SZ > ep)

159 d3df3087 2003-12-06 devnull 			return 0;

160 d3df3087 2003-12-06 devnull 		f->perm = GBIT32(p);

161 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

162 d3df3087 2003-12-06 devnull 		f->mode = GBIT8(p);

163 d3df3087 2003-12-06 devnull 		p += BIT8SZ;

164 d3df3087 2003-12-06 devnull 		break;

165 d3df3087 2003-12-06 devnull 

166 d3df3087 2003-12-06 devnull 	case Tread:

167 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)

168 d3df3087 2003-12-06 devnull 			return 0;

169 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);

170 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

171 d3df3087 2003-12-06 devnull 		f->offset = GBIT64(p);

172 d3df3087 2003-12-06 devnull 		p += BIT64SZ;

173 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);

174 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

175 d3df3087 2003-12-06 devnull 		break;

176 d3df3087 2003-12-06 devnull 

177 d3df3087 2003-12-06 devnull 	case Twrite:

178 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)

179 d3df3087 2003-12-06 devnull 			return 0;

180 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);

181 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

182 d3df3087 2003-12-06 devnull 		f->offset = GBIT64(p);

183 d3df3087 2003-12-06 devnull 		p += BIT64SZ;

184 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);

185 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

186 d3df3087 2003-12-06 devnull 		if(p+f->count > ep)

187 d3df3087 2003-12-06 devnull 			return 0;

188 d3df3087 2003-12-06 devnull 		f->data = (char*)p;

189 d3df3087 2003-12-06 devnull 		p += f->count;

190 d3df3087 2003-12-06 devnull 		break;

191 d3df3087 2003-12-06 devnull 

192 d3df3087 2003-12-06 devnull 	case Tclunk:

193 d3df3087 2003-12-06 devnull 	case Tremove:

194 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

195 d3df3087 2003-12-06 devnull 			return 0;

196 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);

197 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

198 d3df3087 2003-12-06 devnull 		break;

199 d3df3087 2003-12-06 devnull 

200 d3df3087 2003-12-06 devnull 	case Tstat:

201 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

202 d3df3087 2003-12-06 devnull 			return 0;

203 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);

204 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

205 d3df3087 2003-12-06 devnull 		break;

206 d3df3087 2003-12-06 devnull 

207 d3df3087 2003-12-06 devnull 	case Twstat:

208 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT16SZ > ep)

209 d3df3087 2003-12-06 devnull 			return 0;

210 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);

211 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

212 d3df3087 2003-12-06 devnull 		f->nstat = GBIT16(p);

213 d3df3087 2003-12-06 devnull 		p += BIT16SZ;

214 d3df3087 2003-12-06 devnull 		if(p+f->nstat > ep)

215 d3df3087 2003-12-06 devnull 			return 0;

216 d3df3087 2003-12-06 devnull 		f->stat = p;

217 d3df3087 2003-12-06 devnull 		p += f->nstat;

218 d3df3087 2003-12-06 devnull 		break;

219 d3df3087 2003-12-06 devnull 

220 d3df3087 2003-12-06 devnull /*

221 d3df3087 2003-12-06 devnull  */

222 d3df3087 2003-12-06 devnull 	case Rversion:

223 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

224 d3df3087 2003-12-06 devnull 			return 0;

225 d3df3087 2003-12-06 devnull 		f->msize = GBIT32(p);

226 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

227 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->version);

228 d3df3087 2003-12-06 devnull 		break;

229 d3df3087 2003-12-06 devnull 

230 d3df3087 2003-12-06 devnull 	case Rerror:

231 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->ename);

232 fb941e08 2005-09-13 devnull 		f->errornum = 0;

233 fb941e08 2005-09-13 devnull 		if(dotu){

234 fb941e08 2005-09-13 devnull 			if(p+BIT16SZ > ep)

235 fb941e08 2005-09-13 devnull 				return 0;

236 fb941e08 2005-09-13 devnull 			f->errornum = GBIT16(p);

237 fb941e08 2005-09-13 devnull 			p += BIT16SZ;

238 fb941e08 2005-09-13 devnull 		}

239 d3df3087 2003-12-06 devnull 		break;

240 d3df3087 2003-12-06 devnull 

241 d3df3087 2003-12-06 devnull 	case Rflush:

242 d3df3087 2003-12-06 devnull 		break;

243 d3df3087 2003-12-06 devnull 

244 d3df3087 2003-12-06 devnull 	case Rauth:

245 d3df3087 2003-12-06 devnull 		p = gqid(p, ep, &f->aqid);

246 d3df3087 2003-12-06 devnull 		if(p == nil)

247 d3df3087 2003-12-06 devnull 			break;

248 d3df3087 2003-12-06 devnull 		break;

249 d3df3087 2003-12-06 devnull 

250 d3df3087 2003-12-06 devnull 	case Rattach:

251 d3df3087 2003-12-06 devnull 		p = gqid(p, ep, &f->qid);

252 d3df3087 2003-12-06 devnull 		if(p == nil)

253 d3df3087 2003-12-06 devnull 			break;

254 d3df3087 2003-12-06 devnull 		break;

255 d3df3087 2003-12-06 devnull 

256 d3df3087 2003-12-06 devnull 	case Rwalk:

257 d3df3087 2003-12-06 devnull 		if(p+BIT16SZ > ep)

258 d3df3087 2003-12-06 devnull 			return 0;

259 d3df3087 2003-12-06 devnull 		f->nwqid = GBIT16(p);

260 d3df3087 2003-12-06 devnull 		p += BIT16SZ;

261 d3df3087 2003-12-06 devnull 		if(f->nwqid > MAXWELEM)

262 d3df3087 2003-12-06 devnull 			return 0;

263 d3df3087 2003-12-06 devnull 		for(i=0; i<f->nwqid; i++){

264 d3df3087 2003-12-06 devnull 			p = gqid(p, ep, &f->wqid[i]);

265 d3df3087 2003-12-06 devnull 			if(p == nil)

266 d3df3087 2003-12-06 devnull 				break;

267 d3df3087 2003-12-06 devnull 		}

268 d3df3087 2003-12-06 devnull 		break;

269 d3df3087 2003-12-06 devnull 

270 d3df3087 2003-12-06 devnull 	case Ropen:

271 32f69c36 2003-12-11 devnull 	case Ropenfd:

272 d3df3087 2003-12-06 devnull 	case Rcreate:

273 d3df3087 2003-12-06 devnull 		p = gqid(p, ep, &f->qid);

274 d3df3087 2003-12-06 devnull 		if(p == nil)

275 d3df3087 2003-12-06 devnull 			break;

276 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

277 d3df3087 2003-12-06 devnull 			return 0;

278 d3df3087 2003-12-06 devnull 		f->iounit = GBIT32(p);

279 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

280 32f69c36 2003-12-11 devnull 		if(f->type == Ropenfd){

281 32f69c36 2003-12-11 devnull 			if(p+BIT32SZ > ep)

282 32f69c36 2003-12-11 devnull 				return 0;

283 32f69c36 2003-12-11 devnull 			f->unixfd = GBIT32(p);

284 32f69c36 2003-12-11 devnull 			p += BIT32SZ;

285 32f69c36 2003-12-11 devnull 		}

286 d3df3087 2003-12-06 devnull 		break;

287 d3df3087 2003-12-06 devnull 

288 d3df3087 2003-12-06 devnull 	case Rread:

289 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

290 d3df3087 2003-12-06 devnull 			return 0;

291 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);

292 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

293 d3df3087 2003-12-06 devnull 		if(p+f->count > ep)

294 d3df3087 2003-12-06 devnull 			return 0;

295 d3df3087 2003-12-06 devnull 		f->data = (char*)p;

296 d3df3087 2003-12-06 devnull 		p += f->count;

297 d3df3087 2003-12-06 devnull 		break;

298 d3df3087 2003-12-06 devnull 

299 d3df3087 2003-12-06 devnull 	case Rwrite:

300 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)

301 d3df3087 2003-12-06 devnull 			return 0;

302 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);

303 d3df3087 2003-12-06 devnull 		p += BIT32SZ;

304 d3df3087 2003-12-06 devnull 		break;

305 d3df3087 2003-12-06 devnull 

306 d3df3087 2003-12-06 devnull 	case Rclunk:

307 d3df3087 2003-12-06 devnull 	case Rremove:

308 d3df3087 2003-12-06 devnull 		break;

309 d3df3087 2003-12-06 devnull 

310 d3df3087 2003-12-06 devnull 	case Rstat:

311 d3df3087 2003-12-06 devnull 		if(p+BIT16SZ > ep)

312 d3df3087 2003-12-06 devnull 			return 0;

313 d3df3087 2003-12-06 devnull 		f->nstat = GBIT16(p);

314 d3df3087 2003-12-06 devnull 		p += BIT16SZ;

315 d3df3087 2003-12-06 devnull 		if(p+f->nstat > ep)

316 d3df3087 2003-12-06 devnull 			return 0;

317 d3df3087 2003-12-06 devnull 		f->stat = p;

318 d3df3087 2003-12-06 devnull 		p += f->nstat;

319 d3df3087 2003-12-06 devnull 		break;

320 d3df3087 2003-12-06 devnull 

321 d3df3087 2003-12-06 devnull 	case Rwstat:

322 d3df3087 2003-12-06 devnull 		break;

323 d3df3087 2003-12-06 devnull 	}

324 d3df3087 2003-12-06 devnull 

325 d3df3087 2003-12-06 devnull 	if(p==nil || p>ep)

326 d3df3087 2003-12-06 devnull 		return 0;

327 d3df3087 2003-12-06 devnull 	if(ap+size == p)

328 d3df3087 2003-12-06 devnull 		return size;

329 d3df3087 2003-12-06 devnull 	return 0;

330 d3df3087 2003-12-06 devnull }

331 fb941e08 2005-09-13 devnull 

332 fb941e08 2005-09-13 devnull uint

333 fb941e08 2005-09-13 devnull convM2S(uchar *ap, uint nap, Fcall *f)

334 fb941e08 2005-09-13 devnull {

335 fb941e08 2005-09-13 devnull 	return convM2Su(ap, nap, f, 0);

336 fb941e08 2005-09-13 devnull }