1 # 2 3 #include "rcv.h" 4 #include <sys/stat.h> 5 #include <errno.h> 6 7 /* 8 * Mail -- a mail program 9 * 10 * File I/O. 11 */ 12 13 static char *SccsId = "@(#)fio.c 1.1 10/08/80"; 14 15 /* 16 * Set up the input pointers while copying the mail file into 17 * /tmp. 18 */ 19 20 setptr(ibuf) 21 FILE *ibuf; 22 { 23 register int count, s, l; 24 off_t offset; 25 char linebuf[LINESIZE]; 26 int maybe, mestmp, flag; 27 struct message this; 28 extern char tempSet[]; 29 30 if ((mestmp = opentemp(tempSet)) < 0) 31 exit(1); 32 msgCount = 0; 33 offset = 0; 34 s = 0; 35 l = 0; 36 maybe = 1; 37 flag = MUSED; 38 if (value("hold") != NOSTR) 39 flag = MPRESERVE|MUSED; 40 for (;;) { 41 if ((count = readline(ibuf, linebuf)) == 0) { 42 this.m_flag = flag; 43 this.m_offset = offsetof(offset); 44 this.m_block = blockof(offset); 45 this.m_size = s; 46 this.m_lines = l; 47 if (append(&this, mestmp)) { 48 perror(tempSet); 49 exit(1); 50 } 51 fclose(ibuf); 52 makemessage(mestmp); 53 close(mestmp); 54 return; 55 } 56 if (putline(otf, linebuf) < 0) { 57 perror("/tmp"); 58 exit(1); 59 } 60 if (maybe && ishead(linebuf)) { 61 msgCount++; 62 this.m_flag = flag; 63 this.m_block = blockof(offset); 64 this.m_offset = offsetof(offset); 65 this.m_size = s; 66 this.m_lines = l; 67 s = 0; 68 l = 0; 69 if (append(&this, mestmp)) { 70 perror(tempSet); 71 exit(1); 72 } 73 } 74 offset += count; 75 s += count; 76 l++; 77 maybe = 0; 78 if (linebuf[0] == 0) 79 maybe = 1; 80 } 81 } 82 83 /* 84 * Drop the passed line onto the passed output buffer. 85 * If a write error occurs, return -1, else the count of 86 * characters written, including the newline. 87 */ 88 89 putline(obuf, linebuf) 90 FILE *obuf; 91 char *linebuf; 92 { 93 register int c; 94 95 c = strlen(linebuf); 96 fputs(linebuf, obuf); 97 putc('\n', obuf); 98 if (ferror(obuf)) 99 return(-1); 100 return(c+1); 101 } 102 103 /* 104 * Read up a line from the specified input into the line 105 * buffer. Return the number of characters read. Do not 106 * include the newline at the end. 107 */ 108 109 readline(ibuf, linebuf) 110 FILE *ibuf; 111 char *linebuf; 112 { 113 register char *cp; 114 register int c; 115 116 do { 117 clearerr(ibuf); 118 c = getc(ibuf); 119 for (cp = linebuf; c != '\n' && c != EOF; c = getc(ibuf)) { 120 if (c == 0) 121 continue; 122 if (cp - linebuf < LINESIZE-2) 123 *cp++ = c; 124 } 125 } while (ferror(ibuf) && ibuf == stdin); 126 *cp = 0; 127 if (c == EOF && cp == linebuf) 128 return(0); 129 return(cp - linebuf + 1); 130 } 131 132 /* 133 * Return a file buffer all ready to read up the 134 * passed message pointer. 135 */ 136 137 FILE * 138 setinput(mp) 139 register struct message *mp; 140 { 141 off_t off; 142 143 fflush(otf); 144 off = mp->m_block; 145 off <<= 9; 146 off += mp->m_offset; 147 if (fseek(itf, off, 0) < 0) { 148 perror("fseek"); 149 panic("temporary file seek"); 150 } 151 return(itf); 152 } 153 154 /* 155 * Take the data out of the passed ghost file and toss it into 156 * a dynamically allocated message structure. 157 */ 158 159 makemessage(f) 160 { 161 register struct message *m; 162 register char *mp; 163 register count; 164 165 mp = calloc((unsigned) (msgCount + 1), sizeof *m); 166 if (mp == NOSTR) { 167 printf("Insufficient memory for %d messages\n", msgCount); 168 exit(1); 169 } 170 message = (struct message *) mp; 171 dot = message; 172 lseek(f, 0L, 0); 173 while (count = read(f, mp, BUFSIZ)) 174 mp += count; 175 for (m = &message[0]; m < &message[msgCount]; m++) { 176 m->m_size = (m+1)->m_size; 177 m->m_lines = (m+1)->m_lines; 178 } 179 message[msgCount].m_size = 0; 180 message[msgCount].m_lines = 0; 181 } 182 183 /* 184 * Append the passed message descriptor onto the temp file. 185 * If the write fails, return 1, else 0 186 */ 187 188 append(mp, f) 189 struct message *mp; 190 { 191 if (write(f, (char *) mp, sizeof *mp) != sizeof *mp) 192 return(1); 193 return(0); 194 } 195 196 /* 197 * Delete a file, but only if the file is a plain file. 198 */ 199 200 remove(name) 201 char name[]; 202 { 203 struct stat statb; 204 extern int errno; 205 206 if (stat(name, &statb) < 0) 207 return(-1); 208 if ((statb.st_mode & S_IFMT) != S_IFREG) { 209 errno = EISDIR; 210 return(-1); 211 } 212 return(unlink(name)); 213 } 214 215 /* 216 * Terminate an editing session by attempting to write out the user's 217 * file from the temporary. 218 */ 219 220 edstop() 221 { 222 register int gotcha, c; 223 register struct message *mp; 224 FILE *obuf; 225 226 for (mp = &message[0], gotcha = 0; mp < &message[msgCount]; mp++) 227 if (mp->m_flag & (MODIFY|MDELETED)) { 228 gotcha++; 229 break; 230 } 231 if (!gotcha) 232 return; 233 printf("\"%s\" ", editfile); 234 flush(); 235 if ((obuf = fopen(editfile, "w")) == NULL) { 236 perror(editfile); 237 reset(0); 238 } 239 c = 0; 240 for (mp = &message[0]; mp < &message[msgCount]; mp++) { 241 if ((mp->m_flag & MDELETED) != 0) 242 continue; 243 c++; 244 if (send(mp, obuf) < 0) { 245 perror(editfile); 246 reset(0); 247 } 248 } 249 fflush(obuf); 250 if (ferror(obuf)) { 251 perror(editfile); 252 reset(0); 253 } 254 if (c == 0) { 255 remove(editfile); 256 printf("removed\n"); 257 } 258 else 259 printf("complete\n"); 260 flush(); 261 } 262 263 /* 264 * Empty the output buffer. 265 */ 266 267 clrbuf(buf) 268 register FILE *buf; 269 { 270 271 buf = stdout; 272 buf->_ptr = buf->_base; 273 buf->_cnt = BUFSIZ; 274 } 275 276 /* 277 * Open a temp file by creating, closing, unlinking, and 278 * reopening. Return the open file descriptor. 279 */ 280 281 opentemp(file) 282 char file[]; 283 { 284 register int f; 285 286 if ((f = creat(file, 0600)) < 0) { 287 perror(file); 288 return(-1); 289 } 290 close(f); 291 if ((f = open(file, 2)) < 0) { 292 perror(file); 293 remove(file); 294 return(-1); 295 } 296 remove(file); 297 return(f); 298 } 299 300 /* 301 * Flush the standard output. 302 */ 303 304 flush() 305 { 306 fflush(stdout); 307 fflush(stderr); 308 } 309 310 /* 311 * Determine the size of the file possessed by 312 * the passed buffer. 313 */ 314 315 off_t 316 fsize(iob) 317 FILE *iob; 318 { 319 register int f; 320 struct stat sbuf; 321 322 f = fileno(iob); 323 if (fstat(f, &sbuf) < 0) 324 return(0); 325 return(sbuf.st_size); 326 } 327 328 /* 329 * Take a file name, possibly with shell meta characters 330 * in it and expand it by using "sh -c echo filename" 331 * Return the file name as a dynamic string. 332 */ 333 334 char * 335 expand(name) 336 char name[]; 337 { 338 char xname[BUFSIZ]; 339 char cmdbuf[BUFSIZ]; 340 register int pid, l, rc; 341 register char *cp, *Shell; 342 int s, pivec[2], (*sigint)(); 343 struct stat sbuf; 344 345 if (!anyof(name, "~{[*?$`'\"\\")) 346 return(name); 347 /* sigint = signal(SIGINT, SIG_IGN); */ 348 if (pipe(pivec) < 0) { 349 perror("pipe"); 350 /* signal(SIGINT, sigint) */ 351 return(name); 352 } 353 sprintf(cmdbuf, "echo %s", name); 354 if ((pid = vfork()) == 0) { 355 Shell = value("SHELL"); 356 if (Shell == NOSTR) 357 Shell = SHELL; 358 close(pivec[0]); 359 close(1); 360 dup(pivec[1]); 361 close(pivec[1]); 362 close(2); 363 execl(Shell, Shell, "-c", cmdbuf, 0); 364 _exit(1); 365 } 366 if (pid == -1) { 367 perror("fork"); 368 close(pivec[0]); 369 close(pivec[1]); 370 return(NOSTR); 371 } 372 close(pivec[1]); 373 l = read(pivec[0], xname, BUFSIZ); 374 close(pivec[0]); 375 while (wait(&s) != pid); 376 ; 377 s &= 0377; 378 if (s != 0 && s != SIGPIPE) { 379 fprintf(stderr, "\"Echo\" failed\n"); 380 goto err; 381 } 382 if (l < 0) { 383 perror("read"); 384 goto err; 385 } 386 if (l == 0) { 387 fprintf(stderr, "\"%s\": No match\n", name); 388 goto err; 389 } 390 if (l == BUFSIZ) { 391 fprintf(stderr, "Buffer overflow expanding \"%s\"\n", name); 392 goto err; 393 } 394 xname[l] = 0; 395 for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--) 396 ; 397 *++cp = '\0'; 398 if (any(' ', xname) && stat(xname, &sbuf) < 0) { 399 fprintf(stderr, "\"%s\": Ambiguous\n", name); 400 goto err; 401 } 402 /* signal(SIGINT, sigint) */ 403 return(savestr(xname)); 404 405 err: 406 /* signal(SIGINT, sigint); */ 407 return(NOSTR); 408 } 409 410 /* 411 * A nicer version of Fdopen, which allows us to fclose 412 * without losing the open file. 413 */ 414 415 FILE * 416 Fdopen(fildes, mode) 417 char *mode; 418 { 419 register int f; 420 FILE *fdopen(); 421 422 f = dup(fildes); 423 if (f < 0) { 424 perror("dup"); 425 return(NULL); 426 } 427 return(fdopen(f, mode)); 428 } 429