extern.h

   1 /*
   2  * S-nail - a mail user agent derived from Berkeley Mail.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 Steffen "Daode" Nurpmeso.
   6  * All rights reserved.
   7  */
   8 /*-
   9  * Copyright (c) 1992, 1993
  10  *      The Regents of the University of California.  All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 /* aux.c */
  42 void panic(const char *format, ...);
  43 void holdint(void);
  44 void relseint(void);
  45 void touch(struct message *mp);
  46 int is_dir(char *name);
  47 int argcount(char **argv);
  48 void i_strcpy(char *dest, const char *src, int size);
  49 char *i_strdup(const char *src);
  50 void makelow(char *cp);
  51 int substr(const char *str, const char *sub);
  52 char *colalign(const char *cp, int col, int fill);
  53 void try_pager(FILE *fp);
  54 int source(void *v);
  55 int unstack(void);
  56 void alter(char *name);
  57 int blankline(char *linebuf);
  58 int anyof(char *s1, char *s2);
  59 int is_prefix(const char *as1, const char *as2);
  60 char *last_at_before_slash(const char *sp);
  61 enum protocol which_protocol(const char *name);
  62 const char *protfile(const char *xcp);
  63 char *protbase(const char *cp);
  64 int disconnected(const char *file);
  65 unsigned pjw(const char *cp);
  66 long nextprime(long n);
  67 char *strenc(const char *cp);
  68 char *strdec(const char *cp);
  69 #ifdef USE_MD5
  70 char *md5tohex(const void *vp);
  71 char *cram_md5_string(const char *user, const char *pass, const char *b64);
  72 #endif
  73 char *getuser(void);
  74 char *getpassword(struct termios *otio, int *reset_tio, const char *query);
  75 void transflags(struct message *omessage, long omsgCount, int transparent);
  76 char *getrandstring(size_t length);
  77 void out_of_memory(void);
  78 void *smalloc(size_t s);
  79 void *srealloc(void *v, size_t s);
  80 void *scalloc(size_t nmemb, size_t size);
  81 char *sstpcpy(char *dst, const char *src);
  82 char *sstrdup(const char *cp);
  83 enum okay makedir(const char *name);
  84 enum okay cwget(struct cw *cw);
  85 enum okay cwret(struct cw *cw);
  86 void cwrelse(struct cw *cw);
  87 void makeprint(struct str *in, struct str *out);
  88 char *prstr(const char *s);
  89 int prout(const char *s, size_t sz, FILE *fp);
  90 int putuc(int u, int c, FILE *fp);
  91 int asccasecmp(const char *s1, const char *s2);
  92 int ascncasecmp(const char *s1, const char *s2, size_t sz);
  93 char *asccasestr(const char *haystack, const char *xneedle);
  94
  95 /* base64.c */
  96 char *strtob64(const char *p);
  97 char *memtob64(const void *vp, size_t isz);
  98 size_t mime_write_tob64(struct str *in, FILE *fo, int is_header);
  99 void mime_fromb64(struct str *in, struct str *out, int is_text);
 100 void mime_fromb64_b(struct str *in, struct str *out, int is_text, FILE *f);
 101
 102 /* cache.c */
 103 enum okay getcache1(struct mailbox *mp, struct message *m,
 104                 enum needspec need, int setflags);
 105 enum okay getcache(struct mailbox *mp, struct message *m, enum needspec need);
 106 void putcache(struct mailbox *mp, struct message *m);
 107 void initcache(struct mailbox *mp);
 108 void purgecache(struct mailbox *mp, struct message *m, long mc);
 109 void delcache(struct mailbox *mp, struct message *m);
 110 enum okay cache_setptr(int transparent);
 111 enum okay cache_list(struct mailbox *mp, const char *base, int strip, FILE *fp);
 112 enum okay cache_remove(const char *name);
 113 enum okay cache_rename(const char *old, const char *new);
 114 unsigned long cached_uidvalidity(struct mailbox *mp);
 115 FILE *cache_queue(struct mailbox *mp);
 116 enum okay cache_dequeue(struct mailbox *mp);
 117
 118 /* cmd1.c */
 119 char *get_pager(void);
 120 int headers(void *v);
 121 int scroll(void *v);
 122 int Scroll(void *v);
 123 int screensize(void);
 124 int from(void *v);
 125 void printhead(int mesg, FILE *f, int threaded);
 126 int pdot(void *v);
 127 int pcmdlist(void *v);
 128 char *laststring(char *linebuf, int *flag, int strip);
 129 int more(void *v);
 130 int More(void *v);
 131 int type(void *v);
 132 int Type(void *v);
 133 int show(void *v);
 134 int pipecmd(void *v);
 135 int Pipecmd(void *v);
 136 int top(void *v);
 137 int stouch(void *v);
 138 int mboxit(void *v);
 139 int folders(void *v);
 140
 141 /* cmd2.c */
 142 int next(void *v);
 143 int save(void *v);
 144 int Save(void *v);
 145 int copycmd(void *v);
 146 int Copycmd(void *v);
 147 int cmove(void *v);
 148 int cMove(void *v);
 149 int cdecrypt(void *v);
 150 int cDecrypt(void *v);
 151 int cwrite(void *v);
 152 int delete(void *v);
 153 int deltype(void *v);
 154 int undeletecmd(void *v);
 155 int retfield(void *v);
 156 int igfield(void *v);
 157 int saveretfield(void *v);
 158 int saveigfield(void *v);
 159 int fwdretfield(void *v);
 160 int fwdigfield(void *v);
 161 int unignore(void *v);
 162 int unretain(void *v);
 163 int unsaveignore(void *v);
 164 int unsaveretain(void *v);
 165 int unfwdignore(void *v);
 166 int unfwdretain(void *v);
 167
 168 /* cmd3.c */
 169 int shell(void *v);
 170 int dosh(void *v);
 171 int help(void *v);
 172 int schdir(void *v);
 173 int respond(void *v);
 174 int respondall(void *v);
 175 int respondsender(void *v);
 176 int followup(void *v);
 177 int followupall(void *v);
 178 int followupsender(void *v);
 179 int preserve(void *v);
 180 int unread(void *v);
 181 int seen(void *v);
 182 int messize(void *v);
 183 int rexit(void *v);
 184 int set(void *v);
 185 int unset(void *v);
 186 int group(void *v);
 187 int ungroup(void *v);
 188 int cfile(void *v);
 189 int echo(void *v);
 190 int Respond(void *v);
 191 int Followup(void *v);
 192 int forwardcmd(void *v);
 193 int Forwardcmd(void *v);
 194 int ifcmd(void *v);
 195 int elsecmd(void *v);
 196 int endifcmd(void *v);
 197 int alternates(void *v);
 198 int resendcmd(void *v);
 199 int Resendcmd(void *v);
 200 int newmail(void *v);
 201 int shortcut(void *v);
 202 struct shortcut *get_shortcut(const char *str);
 203 int unshortcut(void *v);
 204 struct oldaccount *get_oldaccount(const char *name);
 205 int account(void *v);
 206 int cflag(void *v);
 207 int cunflag(void *v);
 208 int canswered(void *v);
 209 int cunanswered(void *v);
 210 int cdraft(void *v);
 211 int cundraft(void *v);
 212 int ckill(void *v);
 213 int cunkill(void *v);
 214 int cscore(void *v);
 215 int cnoop(void *v);
 216 int cremove(void *v);
 217 int crename(void *v);
 218
 219 /* cmdtab.c */
 220
 221 /* collect.c */
 222 struct attachment *edit_attachments(struct attachment *attach);
 223 struct attachment *add_attachment(struct attachment *attach, char *file,
 224                 int expand_file);
 225 FILE *collect(struct header *hp, int printheaders, struct message *mp,
 226                 char *quotefile, int doprefix, int tflag);
 227 void savedeadletter(FILE *fp);
 228
 229 /* dotlock.c */
 230 int fcntl_lock(int fd, int type);
 231 int dot_lock(const char *fname, int fd, int pollinterval, FILE *fp,
 232                 const char *msg);
 233 void dot_unlock(const char *fname);
 234
 235 /* edit.c */
 236 int editor(void *v);
 237 int visual(void *v);
 238 FILE *run_editor(FILE *fp, off_t size, int type, int readonly,
 239                 struct header *hp, struct message *mp, enum sendaction action,
 240                 sighandler_type oldint);
 241
 242 /* fio.c */
 243 void setptr(FILE *ibuf, off_t offset);
 244 int putline(FILE *obuf, char *linebuf, size_t count);
 245 #define readline(a, b, c)       readline_restart(a, b, c, 0)
 246 int readline_restart(FILE *ibuf, char **linebuf, size_t *linesize, size_t n);
 247 FILE *setinput(struct mailbox *mp, struct message *m, enum needspec need);
 248 struct message *setdot(struct message *mp);
 249 int rm(char *name);
 250 void holdsigs(void);
 251 void relsesigs(void);
 252 off_t fsize(FILE *iob);
 253 char *expand(char *name);
 254 int getfold(char *name, int size);
 255 char *getdeadletter(void);
 256 char *fgetline(char **line, size_t *linesize, size_t *count,
 257                 size_t *llen, FILE *fp, int appendnl);
 258 void newline_appended(void);
 259 enum okay get_body(struct message *mp);
 260 int sclose(struct sock *sp);
 261 enum okay swrite(struct sock *sp, const char *data);
 262 enum okay swrite1(struct sock *sp, const char *data, int sz, int use_buffer);
 263 int sgetline(char **line, size_t *linesize, size_t *linelen, struct sock *sp);
 264 enum okay sopen(const char *xserver, struct sock *sp, int use_ssl,
 265                 const char *uhp, const char *portstr, int verbose);
 266
 267 /* getname.c */
 268 char *getname(int uid);
 269 int getuserid(char *name);
 270
 271 /* getopt.c */
 272 #ifdef USE_BUILTIN_GETOPT
 273 int getopt(int argc, char *const argv[], const char *optstring);
 274 #endif
 275
 276 /* head.c */
 277 int is_head(char *linebuf, size_t linelen);
 278 void parse(char *line, size_t linelen, struct headline *hl, char *pbuf);
 279 void extract_header(FILE *fp, struct header *hp);
 280 #define hfieldX(a, b)   hfield_mult(a, b, 1)
 281 #define hfield1(a, b)   hfield_mult(a, b, 0)
 282 char *hfield_mult(char *field, struct message *mp, int mult);
 283 char *thisfield(const char *linebuf, const char *field);
 284 char *nameof(struct message *mp, int reptype);
 285 char *skip_comment(const char *cp);
 286 char *routeaddr(const char *name);
 287 #define is_fileorpipe_addr(NP) \
 288         (((NP)->n_flags & NAME_ADDRSPEC_ISFILEORPIPE) != 0)
 289 int is_addr_invalid(struct name *np, int putmsg);
 290 char *skinned_name(struct name *np);
 291 char *skin(char *name);
 292 int addrspec_with_guts(int doskin, char *name, struct addrguts *agp);
 293 char *realname(char *name);
 294 char *name1(struct message *mp, int reptype);
 295 int msgidcmp(const char *s1, const char *s2);
 296 int is_ign(char *field, size_t fieldlen, struct ignoretab ignore[2]);
 297 int member(char *realfield, struct ignoretab *table);
 298 char *fakefrom(struct message *mp);
 299 char *fakedate(time_t t);
 300 char *nexttoken(char *cp);
 301 time_t unixtime(char *from);
 302 time_t rfctime(char *date);
 303 time_t combinetime(int year, int month, int day,
 304                 int hour, int minute, int second);
 305 void substdate(struct message *m);
 306 int check_from_and_sender(struct name *fromfield, struct name *senderfield);
 307 char *getsender(struct message *m);
 308
 309 /* imap.c */
 310 enum okay imap_noop(void);
 311 enum okay imap_select(struct mailbox *mp, off_t *size, int *count,
 312                 const char *mbx);
 313 int imap_setfile(const char *xserver, int newmail, int isedit);
 314 enum okay imap_header(struct message *m);
 315 enum okay imap_body(struct message *m);
 316 void imap_getheaders(int bot, int top);
 317 void imap_quit(void);
 318 enum okay imap_undelete(struct message *m, int n);
 319 enum okay imap_unread(struct message *m, int n);
 320 int imap_imap(void *vp);
 321 int imap_newmail(int autoinc);
 322 enum okay imap_append(const char *xserver, FILE *fp);
 323 void imap_folders(const char *name, int strip);
 324 enum okay imap_copy(struct message *m, int n, const char *name);
 325 enum okay imap_search1(const char *spec, int f);
 326 int imap_thisaccount(const char *cp);
 327 enum okay imap_remove(const char *name);
 328 enum okay imap_rename(const char *old, const char *new);
 329 enum okay imap_dequeue(struct mailbox *mp, FILE *fp);
 330 int cconnect(void *vp);
 331 int cdisconnect(void *vp);
 332 int ccache(void *vp);
 333 time_t imap_read_date_time(const char *cp);
 334 time_t imap_read_date(const char *cp);
 335 const char *imap_make_date_time(time_t t);
 336 char *imap_quotestr(const char *s);
 337 char *imap_unquotestr(const char *s);
 338
 339 /* imap_gssapi.c */
 340
 341 /* imap_search.c */
 342 enum okay imap_search(const char *spec, int f);
 343 /* junk.c */
 344 int cgood(void *v);
 345 int cjunk(void *v);
 346 int cungood(void *v);
 347 int cunjunk(void *v);
 348 int cclassify(void *v);
 349 int cprobability(void *v);
 350
 351 /* lex.c */
 352 int setfile(char *name, int newmail);
 353 int newmailinfo(int omsgCount);
 354 void commands(void);
 355 int execute(char *linebuf, int contxt, size_t linesize);
 356 void setmsize(int sz);
 357 void onintr(int s);
 358 void announce(int printheaders);
 359 int newfileinfo(void);
 360 int getmdot(int newmail);
 361 int pversion(void *v);
 362 void load(char *name);
 363 void initbox(const char *name);
 364
 365 /* list.c */
 366 int getmsglist(char *buf, int *vector, int flags);
 367 int getrawlist(const char *line, size_t linesize,
 368                 char **argv, int argc, int echolist);
 369 int first(int f, int m);
 370 void mark(int mesg, int f);
 371
 372 /* lzw.c */
 373 int zwrite(void *cookie, const char *wbp, int num);
 374 int zfree(void *cookie);
 375 int zread(void *cookie, char *rbp, int num);
 376 void *zalloc(FILE *fp);
 377
 378 /* macro.c */
 379 int cdefine(void *v);
 380 int define1(const char *name, int account);
 381 int cundef(void *v);
 382 int ccall(void *v);
 383 int callaccount(const char *name);
 384 int callhook(const char *name, int newmail);
 385 int listaccounts(FILE *fp);
 386 int cdefines(void *v);
 387 void delaccount(const char *name);
 388
 389 /* maildir.c */
 390 int maildir_setfile(const char *name, int newmail, int isedit);
 391 void maildir_quit(void);
 392 enum okay maildir_append(const char *name, FILE *fp);
 393 enum okay maildir_remove(const char *name);
 394
 395 /* main.c */
 396 int main(int argc, char *argv[]);
 397
 398 /* mime.c */
 399 char *gettcharset(void);
 400 char *need_hdrconv(struct header *hp, enum gfield w);
 401 #ifdef HAVE_ICONV
 402 iconv_t iconv_open_ft(const char *tocode, const char *fromcode);
 403 size_t iconv_ft(iconv_t cd, char **inb, size_t *inbleft,
 404                 char **outb, size_t *outbleft, int tolerant);
 405 #endif
 406 enum mimeenc mime_getenc(char *h);
 407 int mime_getcontent(char *h);
 408 char *mime_getparam(char *param, char *h);
 409 char *mime_getboundary(char *h);
 410 char *mime_filecontent(char *name);
 411 int get_mime_convert(FILE *fp, char **contenttype, char **charset,
 412                 enum mimeclean *isclean, int dosign);
 413 void mime_fromhdr(struct str *in, struct str *out, enum tdflags flags);
 414 char *mime_fromaddr(char *name);
 415 size_t prefixwrite(void *ptr, size_t size, size_t nmemb, FILE *f,
 416                 char *prefix, size_t prefixlen);
 417 size_t mime_write(void *ptr, size_t size, FILE *f,
 418                 enum conversion convert, enum tdflags dflags,
 419                 char *prefix, size_t prefixlen, char **rest, size_t *restsize);
 420
 421 /* names.c */
 422 struct name *nalloc(char *str, enum gfield ntype);
 423 struct name *ndup(struct name *np, enum gfield ntype);
 424 struct name *extract(char *line, enum gfield ntype);
 425 struct name *sextract(char *line, enum gfield ntype);
 426 struct name *lextract(char *line, enum gfield ntype);
 427 char *detract(struct name *np, enum gfield ntype);
 428 struct name *checkaddrs(struct name *np);
 429 struct name *outof(struct name *names, FILE *fo, struct header *hp);
 430 struct name *usermap(struct name *names);
 431 struct name *cat(struct name *n1, struct name *n2);
 432 char **unpack(struct name *np);
 433 struct name *elide(struct name *names);
 434 int count(struct name *np);
 435 struct name *delete_alternates(struct name *np);
 436 int is_myname(char *name);
 437
 438 /* nss.c */
 439 #ifdef USE_NSS
 440 enum okay ssl_open(const char *server, struct sock *sp, const char *uhp);
 441 void nss_gen_err(const char *fmt, ...);
 442 #endif
 443
 444 /* openssl.c */
 445 #ifdef USE_OPENSSL
 446 enum okay ssl_open(const char *server, struct sock *sp, const char *uhp);
 447 void ssl_gen_err(const char *fmt, ...);
 448 #endif
 449 int cverify(void *vp);
 450 FILE *smime_sign(FILE *ip, struct header *);
 451 FILE *smime_encrypt(FILE *ip, const char *certfile, const char *to);
 452 struct message *smime_decrypt(struct message *m, const char *to,
 453                 const char *cc, int signcall);
 454 enum okay smime_certsave(struct message *m, int n, FILE *op);
 455
 456 /* pop3.c */
 457 enum okay pop3_noop(void);
 458 int pop3_setfile(const char *server, int newmail, int isedit);
 459 enum okay pop3_header(struct message *m);
 460 enum okay pop3_body(struct message *m);
 461 void pop3_quit(void);
 462
 463 /* popen.c */
 464 sighandler_type safe_signal(int signum, sighandler_type handler);
 465 FILE *safe_fopen(const char *file, const char *mode, int *omode);
 466 FILE *Fopen(const char *file, const char *mode);
 467 FILE *Fdopen(int fd, const char *mode);
 468 int Fclose(FILE *fp);
 469 FILE *Zopen(const char *file, const char *mode, int *compression);
 470 FILE *Popen(const char *cmd, const char *mode, const char *shell, int newfd1);
 471 int Pclose(FILE *ptr);
 472 void close_all_files(void);
 473 int run_command(char *cmd, sigset_t *mask, int infd, int outfd,
 474                 char *a0, char *a1, char *a2);
 475 int start_command(const char *cmd, sigset_t *mask, int infd, int outfd,
 476                 const char *a0, const char *a1, const char *a2);
 477 void prepare_child(sigset_t *nset, int infd, int outfd);
 478 void sigchild(int signo);
 479 void free_child(int pid);
 480 int wait_child(int pid);
 481
 482 /* quit.c */
 483 int quitcmd(void *v);
 484 void quit(void);
 485 int holdbits(void);
 486 enum okay makembox(void);
 487 int savequitflags(void);
 488 void restorequitflags(int);
 489
 490 /* send.c */
 491 char *foldergets(char **s, size_t *size, size_t *count, size_t *llen,
 492                 FILE *stream);
 493 #undef send
 494 #define send(a, b, c, d, e, f)  xsend(a, b, c, d, e, f)
 495 int send(struct message *mp, FILE *obuf, struct ignoretab *doign,
 496                 char *prefix, enum sendaction action, off_t *stats);
 497
 498 /* sendout.c */
 499 char *makeboundary(void);
 500 int mail(struct name *to, struct name *cc, struct name *bcc,
 501                 struct name *smopts, char *subject, struct attachment *attach,
 502                 char *quotefile, int recipient_record, int tflag, int Eflag);
 503 int sendmail(void *v);
 504 int Sendmail(void *v);
 505 enum okay mail1(struct header *hp, int printheaders, struct message *quote,
 506                 char *quotefile, int recipient_record, int doprefix, int tflag,
 507                 int Eflag);
 508 int mkdate(FILE *fo, const char *field);
 509 int puthead(struct header *hp, FILE *fo, enum gfield w,
 510                 enum sendaction action, enum conversion convert,
 511                 char *contenttype, char *charset);
 512 enum okay resend_msg(struct message *mp, struct name *to, int add_resent);
 513
 514 /* smtp.c */
 515 char *nodename(int mayoverride);
 516 char *myaddrs(struct header *hp);
 517 char *myorigin(struct header *hp);
 518 char *smtp_auth_var(const char *type, const char *addr);
 519 int smtp_mta(char *server, struct name *to, FILE *fi, struct header *hp,
 520                 const char *user, const char *password, const char *skinned);
 521
 522 /* ssl.c */
 523 void ssl_set_vrfy_level(const char *uhp);
 524 enum okay ssl_vrfy_decide(void);
 525 char *ssl_method_string(const char *uhp);
 526 enum okay smime_split(FILE *ip, FILE **hp, FILE **bp, long xcount, int keep);
 527 FILE *smime_sign_assemble(FILE *hp, FILE *bp, FILE *sp);
 528 FILE *smime_encrypt_assemble(FILE *hp, FILE *yp);
 529 struct message *smime_decrypt_assemble(struct message *m, FILE *hp, FILE *bp);
 530 int ccertsave(void *v);
 531 enum okay rfc2595_hostname_match(const char *host, const char *pattern);
 532
 533 /* strings.c */
 534 void *salloc(size_t size);
 535 void *csalloc(size_t nmemb, size_t size);
 536 void sreset(void);
 537 void spreserve(void);
 538 char *savestr(const char *str);
 539 char *savestrbuf(const char *sbuf, size_t sbuf_len);
 540 char *save2str(const char *str, const char *old);
 541 char *savecat(const char *s1, const char *s2);
 542
 543 /* temp.c */
 544 FILE *Ftemp(char **fn, char *prefix, char *mode, int bits, int register_file);
 545 void Ftfree(char **fn);
 546 void tinit(void);
 547
 548 /* thread.c */
 549 int thread(void *vp);
 550 int unthread(void *vp);
 551 struct message *next_in_thread(struct message *mp);
 552 struct message *prev_in_thread(struct message *mp);
 553 struct message *this_in_thread(struct message *mp, long n);
 554 int sort(void *vp);
 555 int ccollapse(void *v);
 556 int cuncollapse(void *v);
 557 void uncollapse1(struct message *m, int always);
 558
 559 /* tty.c */
 560 int grabh(struct header *hp, enum gfield gflags, int subjfirst);
 561 char *readtty(char *prefix, char *string);
 562 int yorn(char *msg);
 563
 564 /* v7.local.c */
 565 void findmail(char *user, int force, char *buf, int size);
 566 void demail(void);
 567 char *username(void);
 568
 569 /* vars.c */
 570 void assign(const char *name, const char *value);
 571 char *vcopy(const char *str);
 572 char *value(const char *name);
 573 struct grouphead *findgroup(char *name);
 574 void printgroup(char *name);
 575 int hash(const char *name);
 576 int unset_internal(const char *name);
 577 void remove_group(const char *name);