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 6.5 (Berkeley) 01/21/93"; 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("chompheader: 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("chompheader: syntax error, line \"%s\"", line); 77 return (0); 78 } 79 fvalue = &p[1]; 80 while (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 (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 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 sendtolist(h->h_value, (ADDRESS *) NULL, &e->e_errorqueue, e); 330 } 331 if (tTd(32, 1)) 332 printf("----------------------------\n"); 333 334 /* store hop count */ 335 if (hopcnt > e->e_hopcount) 336 e->e_hopcount = hopcnt; 337 338 /* message priority */ 339 p = hvalue("precedence", e); 340 if (p != NULL) 341 e->e_class = priencode(p); 342 if (!queuejob) 343 e->e_msgpriority = e->e_msgsize 344 - e->e_class * WkClassFact 345 + e->e_nrcpts * WkRecipFact; 346 347 /* full name of from person */ 348 p = hvalue("full-name", e); 349 if (p != NULL) 350 define('x', p, e); 351 352 /* date message originated */ 353 p = hvalue("posted-date", e); 354 if (p == NULL) 355 p = hvalue("date", e); 356 if (p != NULL) 357 { 358 extern char *arpatounix(); 359 360 define('a', p, e); 361 if ((p = arpatounix(p, e)) != NULL) 362 define('d', newstr(p), e); 363 } 364 365 /* 366 ** Log collection information. 367 */ 368 369 # ifdef LOG 370 if (!queuejob && LogLevel > 1) 371 { 372 char *name; 373 char hbuf[MAXNAME]; 374 char sbuf[MAXLINE]; 375 376 if (RealHostName == NULL) 377 name = "local"; 378 else if (RealHostName[0] == '[') 379 name = RealHostName; 380 else 381 { 382 extern char *inet_ntoa(); 383 384 name = hbuf; 385 (void)sprintf(hbuf, "%.80s (%s)", 386 RealHostName, inet_ntoa(RealHostAddr.sin_addr)); 387 } 388 389 /* some versions of syslog only take 5 printf args */ 390 sprintf(sbuf, "from=%.200s, size=%ld, class=%d, pri=%ld, nrcpts=%d, msgid=%.100s", 391 e->e_from.q_paddr, e->e_msgsize, e->e_class, 392 e->e_msgpriority, e->e_nrcpts, msgid); 393 syslog(LOG_INFO, "%s: %s, received from %s\n", 394 e->e_id, sbuf, name); 395 } 396 # endif /* LOG */ 397 } 398 /* 399 ** PRIENCODE -- encode external priority names into internal values. 400 ** 401 ** Parameters: 402 ** p -- priority in ascii. 403 ** 404 ** Returns: 405 ** priority as a numeric level. 406 ** 407 ** Side Effects: 408 ** none. 409 */ 410 411 priencode(p) 412 char *p; 413 { 414 register int i; 415 416 for (i = 0; i < NumPriorities; i++) 417 { 418 if (!strcasecmp(p, Priorities[i].pri_name)) 419 return (Priorities[i].pri_val); 420 } 421 422 /* unknown priority */ 423 return (0); 424 } 425 /* 426 ** CRACKADDR -- parse an address and turn it into a macro 427 ** 428 ** This doesn't actually parse the address -- it just extracts 429 ** it and replaces it with "$g". The parse is totally ad hoc 430 ** and isn't even guaranteed to leave something syntactically 431 ** identical to what it started with. However, it does leave 432 ** something semantically identical. 433 ** 434 ** This algorithm has been cleaned up to handle a wider range 435 ** of cases -- notably quoted and backslash escaped strings. 436 ** This modification makes it substantially better at preserving 437 ** the original syntax. 438 ** 439 ** Parameters: 440 ** addr -- the address to be cracked. 441 ** 442 ** Returns: 443 ** a pointer to the new version. 444 ** 445 ** Side Effects: 446 ** none. 447 ** 448 ** Warning: 449 ** The return value is saved in local storage and should 450 ** be copied if it is to be reused. 451 */ 452 453 char * 454 crackaddr(addr) 455 register char *addr; 456 { 457 register char *p; 458 register char c; 459 int cmtlev; 460 int realcmtlev; 461 int anglelev, realanglelev; 462 int copylev; 463 bool qmode; 464 bool realqmode; 465 bool skipping; 466 bool putgmac = FALSE; 467 bool quoteit = FALSE; 468 register char *bp; 469 char *buflim; 470 static char buf[MAXNAME]; 471 472 if (tTd(33, 1)) 473 printf("crackaddr(%s)\n", addr); 474 475 /* strip leading spaces */ 476 while (*addr != '\0' && isspace(*addr)) 477 addr++; 478 479 /* 480 ** Start by assuming we have no angle brackets. This will be 481 ** adjusted later if we find them. 482 */ 483 484 bp = buf; 485 buflim = &buf[sizeof buf - 5]; 486 p = addr; 487 copylev = anglelev = realanglelev = cmtlev = realcmtlev = 0; 488 qmode = realqmode = FALSE; 489 490 while ((c = *p++) != '\0') 491 { 492 /* 493 ** If the buffer is overful, go into a special "skipping" 494 ** mode that tries to keep legal syntax but doesn't actually 495 ** output things. 496 */ 497 498 skipping = bp >= buflim; 499 500 if (copylev > 0 && !skipping) 501 *bp++ = c; 502 503 /* check for backslash escapes */ 504 if (c == '\\') 505 { 506 if ((c = *p++) == '\0') 507 { 508 /* too far */ 509 p--; 510 goto putg; 511 } 512 if (copylev > 0 && !skipping) 513 *bp++ = c; 514 goto putg; 515 } 516 517 /* check for quoted strings */ 518 if (c == '"') 519 { 520 qmode = !qmode; 521 if (copylev > 0 && !skipping) 522 realqmode = !realqmode; 523 continue; 524 } 525 if (qmode) 526 goto putg; 527 528 /* check for comments */ 529 if (c == '(') 530 { 531 cmtlev++; 532 533 /* allow space for closing paren */ 534 if (!skipping) 535 { 536 buflim--; 537 realcmtlev++; 538 if (copylev++ <= 0) 539 { 540 *bp++ = ' '; 541 *bp++ = c; 542 } 543 } 544 } 545 if (cmtlev > 0) 546 { 547 if (c == ')') 548 { 549 cmtlev--; 550 copylev--; 551 if (!skipping) 552 { 553 realcmtlev--; 554 buflim++; 555 } 556 } 557 continue; 558 } 559 else if (c == ')') 560 { 561 /* syntax error: unmatched ) */ 562 if (!skipping) 563 bp--; 564 } 565 566 567 /* check for characters that may have to be quoted */ 568 if (strchr(".'@,;:\\()", c) != NULL) 569 { 570 /* 571 ** If these occur as the phrase part of a <> 572 ** construct, but are not inside of () or already 573 ** quoted, they will have to be quoted. Note that 574 ** now (but don't actually do the quoting). 575 */ 576 577 if (cmtlev <= 0 && !qmode) 578 quoteit = TRUE; 579 } 580 581 /* check for angle brackets */ 582 if (c == '<') 583 { 584 register char *q; 585 586 /* oops -- have to change our mind */ 587 anglelev++; 588 if (!skipping) 589 realanglelev++; 590 591 bp = buf; 592 if (quoteit) 593 { 594 *bp++ = '"'; 595 596 /* back up over the '<' and any spaces */ 597 --p; 598 while (isspace(*--p)) 599 continue; 600 p++; 601 } 602 for (q = addr; q < p; ) 603 { 604 c = *q++; 605 if (bp < buflim) 606 { 607 if (quoteit && c == '"') 608 *bp++ = '\\'; 609 *bp++ = c; 610 } 611 } 612 if (quoteit) 613 { 614 *bp++ = '"'; 615 while ((c = *p++) != '<') 616 { 617 if (bp < buflim) 618 *bp++ = c; 619 } 620 *bp++ = c; 621 } 622 copylev = 0; 623 putgmac = quoteit = FALSE; 624 continue; 625 } 626 627 if (c == '>') 628 { 629 if (anglelev > 0) 630 { 631 anglelev--; 632 if (!skipping) 633 { 634 realanglelev--; 635 buflim++; 636 } 637 } 638 else if (!skipping) 639 { 640 /* syntax error: unmatched > */ 641 if (copylev > 0) 642 bp--; 643 continue; 644 } 645 if (copylev++ <= 0) 646 *bp++ = c; 647 continue; 648 } 649 650 /* must be a real address character */ 651 putg: 652 if (copylev <= 0 && !putgmac) 653 { 654 *bp++ = '\001'; 655 *bp++ = 'g'; 656 putgmac = TRUE; 657 } 658 } 659 660 /* repair any syntactic damage */ 661 if (realqmode) 662 *bp++ = '"'; 663 while (realcmtlev-- > 0) 664 *bp++ = ')'; 665 while (realanglelev-- > 0) 666 *bp++ = '>'; 667 *bp++ = '\0'; 668 669 if (tTd(33, 1)) 670 printf("crackaddr=>`%s'\n", buf); 671 672 return (buf); 673 } 674 /* 675 ** PUTHEADER -- put the header part of a message from the in-core copy 676 ** 677 ** Parameters: 678 ** fp -- file to put it on. 679 ** m -- mailer to use. 680 ** e -- envelope to use. 681 ** 682 ** Returns: 683 ** none. 684 ** 685 ** Side Effects: 686 ** none. 687 */ 688 689 /* 690 * Macro for fast max (not available in e.g. DG/UX, 386/ix). 691 */ 692 #ifndef MAX 693 # define MAX(a,b) (((a)>(b))?(a):(b)) 694 #endif 695 696 putheader(fp, m, e) 697 register FILE *fp; 698 register MAILER *m; 699 register ENVELOPE *e; 700 { 701 char buf[MAX(MAXLINE,BUFSIZ)]; 702 register HDR *h; 703 char obuf[MAXLINE]; 704 705 for (h = e->e_header; h != NULL; h = h->h_link) 706 { 707 register char *p; 708 extern bool bitintersect(); 709 710 if (bitset(H_CHECK|H_ACHECK, h->h_flags) && 711 !bitintersect(h->h_mflags, m->m_flags)) 712 continue; 713 714 /* handle Resent-... headers specially */ 715 if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags)) 716 continue; 717 718 p = h->h_value; 719 if (bitset(H_DEFAULT, h->h_flags)) 720 { 721 /* macro expand value if generated internally */ 722 expand(p, buf, &buf[sizeof buf], e); 723 p = buf; 724 if (p == NULL || *p == '\0') 725 continue; 726 } 727 728 if (bitset(H_FROM|H_RCPT, h->h_flags)) 729 { 730 /* address field */ 731 bool oldstyle = bitset(EF_OLDSTYLE, e->e_flags); 732 733 if (bitset(H_FROM, h->h_flags)) 734 oldstyle = FALSE; 735 commaize(h, p, fp, oldstyle, m, e); 736 } 737 else 738 { 739 /* vanilla header line */ 740 register char *nlp; 741 extern char *capitalize(); 742 743 (void) sprintf(obuf, "%s: ", capitalize(h->h_field)); 744 while ((nlp = strchr(p, '\n')) != NULL) 745 { 746 *nlp = '\0'; 747 (void) strcat(obuf, p); 748 *nlp = '\n'; 749 putline(obuf, fp, m); 750 p = ++nlp; 751 obuf[0] = '\0'; 752 } 753 (void) strcat(obuf, p); 754 putline(obuf, fp, m); 755 } 756 } 757 } 758 /* 759 ** COMMAIZE -- output a header field, making a comma-translated list. 760 ** 761 ** Parameters: 762 ** h -- the header field to output. 763 ** p -- the value to put in it. 764 ** fp -- file to put it to. 765 ** oldstyle -- TRUE if this is an old style header. 766 ** m -- a pointer to the mailer descriptor. If NULL, 767 ** don't transform the name at all. 768 ** e -- the envelope containing the message. 769 ** 770 ** Returns: 771 ** none. 772 ** 773 ** Side Effects: 774 ** outputs "p" to file "fp". 775 */ 776 777 commaize(h, p, fp, oldstyle, m, e) 778 register HDR *h; 779 register char *p; 780 FILE *fp; 781 bool oldstyle; 782 register MAILER *m; 783 register ENVELOPE *e; 784 { 785 register char *obp; 786 int opos; 787 bool firstone = TRUE; 788 char obuf[MAXLINE + 3]; 789 extern char *capitalize(); 790 791 /* 792 ** Output the address list translated by the 793 ** mailer and with commas. 794 */ 795 796 if (tTd(14, 2)) 797 printf("commaize(%s: %s)\n", h->h_field, p); 798 799 obp = obuf; 800 (void) sprintf(obp, "%s: ", capitalize(h->h_field)); 801 opos = strlen(h->h_field) + 2; 802 obp += opos; 803 804 /* 805 ** Run through the list of values. 806 */ 807 808 while (*p != '\0') 809 { 810 register char *name; 811 register int c; 812 char savechar; 813 extern char *remotename(); 814 extern char *DelimChar; /* defined in prescan */ 815 816 /* 817 ** Find the end of the name. New style names 818 ** end with a comma, old style names end with 819 ** a space character. However, spaces do not 820 ** necessarily delimit an old-style name -- at 821 ** signs mean keep going. 822 */ 823 824 /* find end of name */ 825 while (isspace(*p) || *p == ',') 826 p++; 827 name = p; 828 for (;;) 829 { 830 char *oldp; 831 char pvpbuf[PSBUFSIZE]; 832 extern bool isatword(); 833 extern char **prescan(); 834 835 (void) prescan(p, oldstyle ? ' ' : ',', pvpbuf); 836 p = DelimChar; 837 838 /* look to see if we have an at sign */ 839 oldp = p; 840 while (*p != '\0' && isspace(*p)) 841 p++; 842 843 if (*p != '@' && !isatword(p)) 844 { 845 p = oldp; 846 break; 847 } 848 p += *p == '@' ? 1 : 2; 849 while (*p != '\0' && isspace(*p)) 850 p++; 851 } 852 /* at the end of one complete name */ 853 854 /* strip off trailing white space */ 855 while (p >= name && (isspace(*p) || *p == ',' || *p == '\0')) 856 p--; 857 if (++p == name) 858 continue; 859 savechar = *p; 860 *p = '\0'; 861 862 /* translate the name to be relative */ 863 name = remotename(name, m, bitset(H_FROM, h->h_flags), FALSE, e); 864 if (*name == '\0') 865 { 866 *p = savechar; 867 continue; 868 } 869 870 /* output the name with nice formatting */ 871 opos += strlen(name); 872 if (!firstone) 873 opos += 2; 874 if (opos > 78 && !firstone) 875 { 876 (void) strcpy(obp, ",\n"); 877 putline(obuf, fp, m); 878 obp = obuf; 879 (void) sprintf(obp, " "); 880 opos = strlen(obp); 881 obp += opos; 882 opos += strlen(name); 883 } 884 else if (!firstone) 885 { 886 (void) sprintf(obp, ", "); 887 obp += 2; 888 } 889 890 /* strip off quote bits as we output */ 891 while ((c = *name++) != '\0' && obp < &obuf[MAXLINE]) 892 { 893 if (bitnset(M_7BITS, m->m_flags)) 894 c &= 0177; 895 *obp++ = c; 896 } 897 firstone = FALSE; 898 *p = savechar; 899 } 900 (void) strcpy(obp, "\n"); 901 putline(obuf, fp, m); 902 } 903 /* 904 ** ISATWORD -- tell if the word we are pointing to is "at". 905 ** 906 ** Parameters: 907 ** p -- word to check. 908 ** 909 ** Returns: 910 ** TRUE -- if p is the word at. 911 ** FALSE -- otherwise. 912 ** 913 ** Side Effects: 914 ** none. 915 */ 916 917 bool 918 isatword(p) 919 register char *p; 920 { 921 extern char lower(); 922 923 if (lower(p[0]) == 'a' && lower(p[1]) == 't' && 924 p[2] != '\0' && isspace(p[2])) 925 return (TRUE); 926 return (FALSE); 927 } 928