1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988 Regents of the University of California. 4 * All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 #ifndef lint 10 static char sccsid[] = "@(#)headers.c 6.14 (Berkeley) 03/01/93"; 11 #endif /* not lint */ 12 13 # include <errno.h> 14 # include "sendmail.h" 15 16 /* 17 ** CHOMPHEADER -- process and save a header line. 18 ** 19 ** Called by collect and by readcf to deal with header lines. 20 ** 21 ** Parameters: 22 ** line -- header as a text line. 23 ** def -- if set, this is a default value. 24 ** e -- the envelope including this header. 25 ** 26 ** Returns: 27 ** flags for this header. 28 ** 29 ** Side Effects: 30 ** The header is saved on the header list. 31 ** Contents of 'line' are destroyed. 32 */ 33 34 chompheader(line, def, e) 35 char *line; 36 bool def; 37 register ENVELOPE *e; 38 { 39 register char *p; 40 register HDR *h; 41 HDR **hp; 42 char *fname; 43 char *fvalue; 44 struct hdrinfo *hi; 45 bool cond = FALSE; 46 BITMAP mopts; 47 48 if (tTd(31, 6)) 49 printf("chompheader: %s\n", line); 50 51 /* strip off options */ 52 clrbitmap(mopts); 53 p = line; 54 if (*p == '?') 55 { 56 /* have some */ 57 register char *q = strchr(p + 1, *p); 58 59 if (q != NULL) 60 { 61 *q++ = '\0'; 62 while (*++p != '\0') 63 setbitn(*p, mopts); 64 p = q; 65 } 66 else 67 usrerr("553 header syntax error, line \"%s\"", line); 68 cond = TRUE; 69 } 70 71 /* find canonical name */ 72 fname = p; 73 p = strchr(p, ':'); 74 if (p == NULL) 75 { 76 syserr("553 header syntax error, line \"%s\"", line); 77 return (0); 78 } 79 fvalue = &p[1]; 80 while (isascii(*--p) && isspace(*p)) 81 continue; 82 *++p = '\0'; 83 makelower(fname); 84 85 /* strip field value on front */ 86 if (*fvalue == ' ') 87 fvalue++; 88 89 /* see if it is a known type */ 90 for (hi = HdrInfo; hi->hi_field != NULL; hi++) 91 { 92 if (strcmp(hi->hi_field, fname) == 0) 93 break; 94 } 95 96 /* see if this is a resent message */ 97 if (!def && bitset(H_RESENT, hi->hi_flags)) 98 e->e_flags |= EF_RESENT; 99 100 /* if this means "end of header" quit now */ 101 if (bitset(H_EOH, hi->hi_flags)) 102 return (hi->hi_flags); 103 104 /* drop explicit From: if same as what we would generate -- for MH */ 105 p = "resent-from"; 106 if (!bitset(EF_RESENT, e->e_flags)) 107 p += 7; 108 if (!def && !QueueRun && strcmp(fname, p) == 0) 109 { 110 if (e->e_from.q_paddr != NULL && 111 strcmp(fvalue, e->e_from.q_paddr) == 0) 112 return (hi->hi_flags); 113 } 114 115 /* delete default value for this header */ 116 for (hp = &e->e_header; (h = *hp) != NULL; hp = &h->h_link) 117 { 118 if (strcmp(fname, h->h_field) == 0 && 119 bitset(H_DEFAULT, h->h_flags) && 120 !bitset(H_FORCE, h->h_flags)) 121 h->h_value = NULL; 122 } 123 124 /* create a new node */ 125 h = (HDR *) xalloc(sizeof *h); 126 h->h_field = newstr(fname); 127 h->h_value = NULL; 128 h->h_link = NULL; 129 bcopy((char *) mopts, (char *) h->h_mflags, sizeof mopts); 130 *hp = h; 131 h->h_flags = hi->hi_flags; 132 if (def) 133 h->h_flags |= H_DEFAULT; 134 if (cond) 135 h->h_flags |= H_CHECK; 136 if (h->h_value != NULL) 137 free((char *) h->h_value); 138 h->h_value = newstr(fvalue); 139 140 /* hack to see if this is a new format message */ 141 if (!def && bitset(H_RCPT|H_FROM, h->h_flags) && 142 (strchr(fvalue, ',') != NULL || strchr(fvalue, '(') != NULL || 143 strchr(fvalue, '<') != NULL || strchr(fvalue, ';') != NULL)) 144 { 145 e->e_flags &= ~EF_OLDSTYLE; 146 } 147 148 return (h->h_flags); 149 } 150 /* 151 ** ADDHEADER -- add a header entry to the end of the queue. 152 ** 153 ** This bypasses the special checking of chompheader. 154 ** 155 ** Parameters: 156 ** field -- the name of the header field. 157 ** value -- the value of the field. It must be lower-cased. 158 ** e -- the envelope to add them to. 159 ** 160 ** Returns: 161 ** none. 162 ** 163 ** Side Effects: 164 ** adds the field on the list of headers for this envelope. 165 */ 166 167 addheader(field, value, e) 168 char *field; 169 char *value; 170 ENVELOPE *e; 171 { 172 register HDR *h; 173 register struct hdrinfo *hi; 174 HDR **hp; 175 176 /* find info struct */ 177 for (hi = HdrInfo; hi->hi_field != NULL; hi++) 178 { 179 if (strcmp(field, hi->hi_field) == 0) 180 break; 181 } 182 183 /* find current place in list -- keep back pointer? */ 184 for (hp = &e->e_header; (h = *hp) != NULL; hp = &h->h_link) 185 { 186 if (strcmp(field, h->h_field) == 0) 187 break; 188 } 189 190 /* allocate space for new header */ 191 h = (HDR *) xalloc(sizeof *h); 192 h->h_field = field; 193 h->h_value = newstr(value); 194 h->h_link = *hp; 195 h->h_flags = hi->hi_flags | H_DEFAULT; 196 clrbitmap(h->h_mflags); 197 *hp = h; 198 } 199 /* 200 ** HVALUE -- return value of a header. 201 ** 202 ** Only "real" fields (i.e., ones that have not been supplied 203 ** as a default) are used. 204 ** 205 ** Parameters: 206 ** field -- the field name. 207 ** e -- the envelope containing the header. 208 ** 209 ** Returns: 210 ** pointer to the value part. 211 ** NULL if not found. 212 ** 213 ** Side Effects: 214 ** none. 215 */ 216 217 char * 218 hvalue(field, e) 219 char *field; 220 register ENVELOPE *e; 221 { 222 register HDR *h; 223 224 for (h = e->e_header; h != NULL; h = h->h_link) 225 { 226 if (!bitset(H_DEFAULT, h->h_flags) && strcmp(h->h_field, field) == 0) 227 return (h->h_value); 228 } 229 return (NULL); 230 } 231 /* 232 ** ISHEADER -- predicate telling if argument is a header. 233 ** 234 ** A line is a header if it has a single word followed by 235 ** optional white space followed by a colon. 236 ** 237 ** Parameters: 238 ** s -- string to check for possible headerness. 239 ** 240 ** Returns: 241 ** TRUE if s is a header. 242 ** FALSE otherwise. 243 ** 244 ** Side Effects: 245 ** none. 246 */ 247 248 bool 249 isheader(s) 250 register char *s; 251 { 252 while (*s > ' ' && *s != ':' && *s != '\0') 253 s++; 254 255 /* following technically violates RFC822 */ 256 while (isascii(*s) && isspace(*s)) 257 s++; 258 259 return (*s == ':'); 260 } 261 /* 262 ** EATHEADER -- run through the stored header and extract info. 263 ** 264 ** Parameters: 265 ** e -- the envelope to process. 266 ** queuejob -- set if running a queued job. 267 ** 268 ** Returns: 269 ** none. 270 ** 271 ** Side Effects: 272 ** Sets a bunch of global variables from information 273 ** in the collected header. 274 ** Aborts the message if the hop count is exceeded. 275 */ 276 277 eatheader(e, queuejob) 278 register ENVELOPE *e; 279 bool queuejob; 280 { 281 register HDR *h; 282 register char *p; 283 int hopcnt = 0; 284 char *msgid; 285 char msgidbuf[MAXNAME]; 286 287 if (tTd(32, 1)) 288 printf("----- collected header -----\n"); 289 msgid = "<none>"; 290 for (h = e->e_header; h != NULL; h = h->h_link) 291 { 292 extern char *capitalize(); 293 294 if (tTd(32, 1)) 295 printf("%s: %s\n", capitalize(h->h_field), h->h_value); 296 297 /* count the number of times it has been processed */ 298 if (bitset(H_TRACE, h->h_flags)) 299 hopcnt++; 300 301 /* send to this person if we so desire */ 302 if (GrabTo && bitset(H_RCPT, h->h_flags) && 303 !bitset(H_DEFAULT, h->h_flags) && 304 (!bitset(EF_RESENT, e->e_flags) || bitset(H_RESENT, h->h_flags))) 305 { 306 (void) sendtolist(h->h_value, (ADDRESS *) NULL, 307 &e->e_sendqueue, e); 308 } 309 310 /* save the message-id for logging */ 311 if (!queuejob && h->h_value != NULL && 312 strcmp(h->h_field, "message-id") == 0) 313 { 314 msgid = h->h_value; 315 if (bitset(H_DEFAULT, h->h_flags)) 316 { 317 expand(msgid, msgidbuf, 318 &msgidbuf[sizeof msgidbuf], e); 319 msgid = msgidbuf; 320 } 321 } 322 323 /* see if this is a return-receipt header */ 324 if (bitset(H_RECEIPTTO, h->h_flags)) 325 e->e_receiptto = h->h_value; 326 327 /* see if this is an errors-to header */ 328 if (bitset(H_ERRORSTO, h->h_flags)) 329 (void) sendtolist(h->h_value, (ADDRESS *) NULL, 330 &e->e_errorqueue, e); 331 } 332 if (tTd(32, 1)) 333 printf("----------------------------\n"); 334 335 /* if we are just verifying (that is, sendmail -t -bv), drop out now */ 336 if (OpMode == MD_VERIFY) 337 return; 338 339 /* store hop count */ 340 if (hopcnt > e->e_hopcount) 341 e->e_hopcount = hopcnt; 342 343 /* message priority */ 344 p = hvalue("precedence", e); 345 if (p != NULL) 346 e->e_class = priencode(p); 347 if (!queuejob) 348 e->e_msgpriority = e->e_msgsize 349 - e->e_class * WkClassFact 350 + e->e_nrcpts * WkRecipFact; 351 352 /* full name of from person */ 353 p = hvalue("full-name", e); 354 if (p != NULL) 355 define('x', p, e); 356 357 /* date message originated */ 358 p = hvalue("posted-date", e); 359 if (p == NULL) 360 p = hvalue("date", e); 361 if (p != NULL) 362 define('a', p, e); 363 364 /* 365 ** Log collection information. 366 */ 367 368 # ifdef LOG 369 if (!queuejob && LogLevel > 4) 370 { 371 char *name; 372 char hbuf[MAXNAME]; 373 char sbuf[MAXLINE]; 374 375 if (RealHostName[0] == '[') 376 name = RealHostName; 377 else 378 { 379 extern char *inet_ntoa(); 380 381 name = hbuf; 382 (void)sprintf(hbuf, "%.80s (%s)", 383 RealHostName, inet_ntoa(RealHostAddr.sin_addr)); 384 } 385 386 /* some versions of syslog only take 5 printf args */ 387 sprintf(sbuf, "from=%.200s, size=%ld, class=%d, pri=%ld, nrcpts=%d, msgid=%.100s", 388 e->e_from.q_paddr, e->e_msgsize, e->e_class, 389 e->e_msgpriority, e->e_nrcpts, msgid); 390 syslog(LOG_INFO, "%s: %s, received from %s", 391 e->e_id, sbuf, name); 392 } 393 # endif /* LOG */ 394 } 395 /* 396 ** PRIENCODE -- encode external priority names into internal values. 397 ** 398 ** Parameters: 399 ** p -- priority in ascii. 400 ** 401 ** Returns: 402 ** priority as a numeric level. 403 ** 404 ** Side Effects: 405 ** none. 406 */ 407 408 priencode(p) 409 char *p; 410 { 411 register int i; 412 413 for (i = 0; i < NumPriorities; i++) 414 { 415 if (!strcasecmp(p, Priorities[i].pri_name)) 416 return (Priorities[i].pri_val); 417 } 418 419 /* unknown priority */ 420 return (0); 421 } 422 /* 423 ** CRACKADDR -- parse an address and turn it into a macro 424 ** 425 ** This doesn't actually parse the address -- it just extracts 426 ** it and replaces it with "$g". The parse is totally ad hoc 427 ** and isn't even guaranteed to leave something syntactically 428 ** identical to what it started with. However, it does leave 429 ** something semantically identical. 430 ** 431 ** This algorithm has been cleaned up to handle a wider range 432 ** of cases -- notably quoted and backslash escaped strings. 433 ** This modification makes it substantially better at preserving 434 ** the original syntax. 435 ** 436 ** Parameters: 437 ** addr -- the address to be cracked. 438 ** 439 ** Returns: 440 ** a pointer to the new version. 441 ** 442 ** Side Effects: 443 ** none. 444 ** 445 ** Warning: 446 ** The return value is saved in local storage and should 447 ** be copied if it is to be reused. 448 */ 449 450 char * 451 crackaddr(addr) 452 register char *addr; 453 { 454 register char *p; 455 register char c; 456 int cmtlev; 457 int realcmtlev; 458 int anglelev, realanglelev; 459 int copylev; 460 bool qmode; 461 bool realqmode; 462 bool skipping; 463 bool putgmac = FALSE; 464 bool quoteit = FALSE; 465 register char *bp; 466 char *buflim; 467 static char buf[MAXNAME]; 468 469 if (tTd(33, 1)) 470 printf("crackaddr(%s)\n", addr); 471 472 /* strip leading spaces */ 473 while (*addr != '\0' && isascii(*addr) && isspace(*addr)) 474 addr++; 475 476 /* 477 ** Start by assuming we have no angle brackets. This will be 478 ** adjusted later if we find them. 479 */ 480 481 bp = buf; 482 buflim = &buf[sizeof buf - 5]; 483 p = addr; 484 copylev = anglelev = realanglelev = cmtlev = realcmtlev = 0; 485 qmode = realqmode = FALSE; 486 487 while ((c = *p++) != '\0') 488 { 489 /* 490 ** If the buffer is overful, go into a special "skipping" 491 ** mode that tries to keep legal syntax but doesn't actually 492 ** output things. 493 */ 494 495 skipping = bp >= buflim; 496 497 if (copylev > 0 && !skipping) 498 *bp++ = c; 499 500 /* check for backslash escapes */ 501 if (c == '\\') 502 { 503 if ((c = *p++) == '\0') 504 { 505 /* too far */ 506 p--; 507 goto putg; 508 } 509 if (copylev > 0 && !skipping) 510 *bp++ = c; 511 goto putg; 512 } 513 514 /* check for quoted strings */ 515 if (c == '"') 516 { 517 qmode = !qmode; 518 if (copylev > 0 && !skipping) 519 realqmode = !realqmode; 520 continue; 521 } 522 if (qmode) 523 goto putg; 524 525 /* check for comments */ 526 if (c == '(') 527 { 528 cmtlev++; 529 530 /* allow space for closing paren */ 531 if (!skipping) 532 { 533 buflim--; 534 realcmtlev++; 535 if (copylev++ <= 0) 536 { 537 *bp++ = ' '; 538 *bp++ = c; 539 } 540 } 541 } 542 if (cmtlev > 0) 543 { 544 if (c == ')') 545 { 546 cmtlev--; 547 copylev--; 548 if (!skipping) 549 { 550 realcmtlev--; 551 buflim++; 552 } 553 } 554 continue; 555 } 556 else if (c == ')') 557 { 558 /* syntax error: unmatched ) */ 559 if (!skipping) 560 bp--; 561 } 562 563 564 /* check for characters that may have to be quoted */ 565 if (strchr(".'@,;:\\()", c) != NULL) 566 { 567 /* 568 ** If these occur as the phrase part of a <> 569 ** construct, but are not inside of () or already 570 ** quoted, they will have to be quoted. Note that 571 ** now (but don't actually do the quoting). 572 */ 573 574 if (cmtlev <= 0 && !qmode) 575 quoteit = TRUE; 576 } 577 578 /* check for angle brackets */ 579 if (c == '<') 580 { 581 register char *q; 582 583 /* oops -- have to change our mind */ 584 anglelev++; 585 if (!skipping) 586 realanglelev++; 587 588 bp = buf; 589 if (quoteit) 590 { 591 *bp++ = '"'; 592 593 /* back up over the '<' and any spaces */ 594 --p; 595 while (isascii(*--p) && isspace(*p)) 596 continue; 597 p++; 598 } 599 for (q = addr; q < p; ) 600 { 601 c = *q++; 602 if (bp < buflim) 603 { 604 if (quoteit && c == '"') 605 *bp++ = '\\'; 606 *bp++ = c; 607 } 608 } 609 if (quoteit) 610 { 611 *bp++ = '"'; 612 while ((c = *p++) != '<') 613 { 614 if (bp < buflim) 615 *bp++ = c; 616 } 617 *bp++ = c; 618 } 619 copylev = 0; 620 putgmac = quoteit = FALSE; 621 continue; 622 } 623 624 if (c == '>') 625 { 626 if (anglelev > 0) 627 { 628 anglelev--; 629 if (!skipping) 630 { 631 realanglelev--; 632 buflim++; 633 } 634 } 635 else if (!skipping) 636 { 637 /* syntax error: unmatched > */ 638 if (copylev > 0) 639 bp--; 640 continue; 641 } 642 if (copylev++ <= 0) 643 *bp++ = c; 644 continue; 645 } 646 647 /* must be a real address character */ 648 putg: 649 if (copylev <= 0 && !putgmac) 650 { 651 *bp++ = MACROEXPAND; 652 *bp++ = 'g'; 653 putgmac = TRUE; 654 } 655 } 656 657 /* repair any syntactic damage */ 658 if (realqmode) 659 *bp++ = '"'; 660 while (realcmtlev-- > 0) 661 *bp++ = ')'; 662 while (realanglelev-- > 0) 663 *bp++ = '>'; 664 *bp++ = '\0'; 665 666 if (tTd(33, 1)) 667 printf("crackaddr=>`%s'\n", buf); 668 669 return (buf); 670 } 671 /* 672 ** PUTHEADER -- put the header part of a message from the in-core copy 673 ** 674 ** Parameters: 675 ** fp -- file to put it on. 676 ** m -- mailer to use. 677 ** e -- envelope to use. 678 ** 679 ** Returns: 680 ** none. 681 ** 682 ** Side Effects: 683 ** none. 684 */ 685 686 /* 687 * Macro for fast max (not available in e.g. DG/UX, 386/ix). 688 */ 689 #ifndef MAX 690 # define MAX(a,b) (((a)>(b))?(a):(b)) 691 #endif 692 693 putheader(fp, m, e) 694 register FILE *fp; 695 register MAILER *m; 696 register ENVELOPE *e; 697 { 698 char buf[MAX(MAXLINE,BUFSIZ)]; 699 register HDR *h; 700 char obuf[MAXLINE]; 701 702 for (h = e->e_header; h != NULL; h = h->h_link) 703 { 704 register char *p; 705 extern bool bitintersect(); 706 707 if (bitset(H_CHECK|H_ACHECK, h->h_flags) && 708 !bitintersect(h->h_mflags, m->m_flags)) 709 continue; 710 711 /* handle Resent-... headers specially */ 712 if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags)) 713 continue; 714 715 p = h->h_value; 716 if (bitset(H_DEFAULT, h->h_flags)) 717 { 718 /* macro expand value if generated internally */ 719 expand(p, buf, &buf[sizeof buf], e); 720 p = buf; 721 if (p == NULL || *p == '\0') 722 continue; 723 } 724 725 if (bitset(H_FROM|H_RCPT, h->h_flags)) 726 { 727 /* address field */ 728 bool oldstyle = bitset(EF_OLDSTYLE, e->e_flags); 729 730 if (bitset(H_FROM, h->h_flags)) 731 oldstyle = FALSE; 732 commaize(h, p, fp, oldstyle, m, e); 733 } 734 else 735 { 736 /* vanilla header line */ 737 register char *nlp; 738 extern char *capitalize(); 739 740 (void) sprintf(obuf, "%s: ", capitalize(h->h_field)); 741 while ((nlp = strchr(p, '\n')) != NULL) 742 { 743 *nlp = '\0'; 744 (void) strcat(obuf, p); 745 *nlp = '\n'; 746 putline(obuf, fp, m); 747 p = ++nlp; 748 obuf[0] = '\0'; 749 } 750 (void) strcat(obuf, p); 751 putline(obuf, fp, m); 752 } 753 } 754 } 755 /* 756 ** COMMAIZE -- output a header field, making a comma-translated list. 757 ** 758 ** Parameters: 759 ** h -- the header field to output. 760 ** p -- the value to put in it. 761 ** fp -- file to put it to. 762 ** oldstyle -- TRUE if this is an old style header. 763 ** m -- a pointer to the mailer descriptor. If NULL, 764 ** don't transform the name at all. 765 ** e -- the envelope containing the message. 766 ** 767 ** Returns: 768 ** none. 769 ** 770 ** Side Effects: 771 ** outputs "p" to file "fp". 772 */ 773 774 commaize(h, p, fp, oldstyle, m, e) 775 register HDR *h; 776 register char *p; 777 FILE *fp; 778 bool oldstyle; 779 register MAILER *m; 780 register ENVELOPE *e; 781 { 782 register char *obp; 783 int opos; 784 bool firstone = TRUE; 785 char obuf[MAXLINE + 3]; 786 extern char *capitalize(); 787 788 /* 789 ** Output the address list translated by the 790 ** mailer and with commas. 791 */ 792 793 if (tTd(14, 2)) 794 printf("commaize(%s: %s)\n", h->h_field, p); 795 796 obp = obuf; 797 (void) sprintf(obp, "%s: ", capitalize(h->h_field)); 798 opos = strlen(h->h_field) + 2; 799 obp += opos; 800 801 /* 802 ** Run through the list of values. 803 */ 804 805 while (*p != '\0') 806 { 807 register char *name; 808 register int c; 809 char savechar; 810 extern char *remotename(); 811 812 /* 813 ** Find the end of the name. New style names 814 ** end with a comma, old style names end with 815 ** a space character. However, spaces do not 816 ** necessarily delimit an old-style name -- at 817 ** signs mean keep going. 818 */ 819 820 /* find end of name */ 821 while ((isascii(*p) && isspace(*p)) || *p == ',') 822 p++; 823 name = p; 824 for (;;) 825 { 826 auto char *oldp; 827 char pvpbuf[PSBUFSIZE]; 828 extern char **prescan(); 829 830 (void) prescan(p, oldstyle ? ' ' : ',', pvpbuf, &oldp); 831 p = oldp; 832 833 /* look to see if we have an at sign */ 834 while (*p != '\0' && isascii(*p) && isspace(*p)) 835 p++; 836 837 if (*p != '@') 838 { 839 p = oldp; 840 break; 841 } 842 p += *p == '@' ? 1 : 2; 843 while (*p != '\0' && isascii(*p) && isspace(*p)) 844 p++; 845 } 846 /* at the end of one complete name */ 847 848 /* strip off trailing white space */ 849 while (p >= name && 850 ((isascii(*p) && isspace(*p)) || *p == ',' || *p == '\0')) 851 p--; 852 if (++p == name) 853 continue; 854 savechar = *p; 855 *p = '\0'; 856 857 /* translate the name to be relative */ 858 name = remotename(name, m, bitset(H_FROM, h->h_flags), 859 TRUE, FALSE, e); 860 if (*name == '\0') 861 { 862 *p = savechar; 863 continue; 864 } 865 866 /* output the name with nice formatting */ 867 opos += strlen(name); 868 if (!firstone) 869 opos += 2; 870 if (opos > 78 && !firstone) 871 { 872 (void) strcpy(obp, ",\n"); 873 putline(obuf, fp, m); 874 obp = obuf; 875 (void) sprintf(obp, " "); 876 opos = strlen(obp); 877 obp += opos; 878 opos += strlen(name); 879 } 880 else if (!firstone) 881 { 882 (void) sprintf(obp, ", "); 883 obp += 2; 884 } 885 886 /* strip off quote bits as we output */ 887 while ((c = *name++) != '\0' && obp < &obuf[MAXLINE]) 888 { 889 if (bitnset(M_7BITS, m->m_flags)) 890 c &= 0177; 891 *obp++ = c; 892 } 893 firstone = FALSE; 894 *p = savechar; 895 } 896 (void) strcpy(obp, "\n"); 897 putline(obuf, fp, m); 898 } 899 /* 900 ** COPYHEADER -- copy header list 901 ** 902 ** This routine is the equivalent of newstr for header lists 903 ** 904 ** Parameters: 905 ** header -- list of header structures to copy. 906 ** 907 ** Returns: 908 ** a copy of 'header'. 909 ** 910 ** Side Effects: 911 ** none. 912 */ 913 914 HDR * 915 copyheader(header) 916 register HDR *header; 917 { 918 register HDR *newhdr; 919 HDR *ret; 920 register HDR **tail = &ret; 921 922 while (header != NULL) 923 { 924 newhdr = (HDR *) xalloc(sizeof(HDR)); 925 STRUCTCOPY(*header, *newhdr); 926 *tail = newhdr; 927 tail = &newhdr->h_link; 928 header = header->h_link; 929 } 930 *tail = NULL; 931 932 return ret; 933 } 934