/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

struct name *cat(struct name *, struct name *);
struct name *delname(struct name *, char *);
struct name *elide(struct name *);
struct name *extract(char *, int);
struct name *gexpand(struct name *, struct grouphead *, int, int);
struct name *nalloc(char *, int);
struct name *outof(struct name *, FILE *, struct header *);
struct name *put(struct name *, struct name *);
struct name *tailof(struct name *);
struct name *usermap(struct name *);
FILE    *Fdopen(int, const char *);
FILE    *Fopen(const char *, const char *);
FILE    *Popen(char *, const char *);
FILE    *collect(struct header *, int);
char    *copyin(char *, char **);
char    *detract(struct name *, int);
char    *expand(char *);
char    *getdeadletter(void);
char    *getname(uid_t);
char    *hfield(const char *, struct message *);
FILE    *infix(struct header *, FILE *);
char    *ishfield(char *, char *, const char *);
char    *name1(struct message *, int);
char    *nameof(struct message *, int);
char    *nextword(char *, char *);
char    *readtty(const char *, char *);
char    *reedit(char *);
FILE    *run_editor(FILE *, off_t, int, int);
char    *salloc(int);
char    *savestr(char *);
FILE    *setinput(struct message *);
char    *skin(char *);
char    *skip_comment(char *);
char    *snarf(char *, int *);
char    *username(void);
char    *value(const char *);
char    *vcopy(const char *);
char    *yankword(char *, char *);
char    *yanklogin(char *, char *);
int      Fclose(FILE *);
int      More(void *);
int      Pclose(FILE *);
int      Respond(void *);
int      Type(void *);
int      doRespond(int *);
int      dorespond(int *);
void     alter(char *);
int      alternates(void *);
void     announce(void);
int      append(struct message *, FILE *);
int      argcount(char **);
void     assign(const char *, const char *);
int      bangexp(char *, size_t);
void     brokpipe(int);
int      charcount(char *, int);
int      check(int, int);
void     clob1(int);
int      clobber(void *);
void     close_all_files(void);
int      cmatch(char *, char *);
void     collhup(int);
void     collint(int);
void     collstop(int);
void     commands(void);
int      copycmd(void *v);
int      core(void *);
int      count(struct name *);
int      deletecmd(void *);
int      delm(int *);
int      deltype(void *);
void     demail(void);
int      diction(const void *, const void *);
int      dosh(void *);
int      echo(void *);
int      edit1(int *, int);
int      editor(void *);
void     edstop(void);
int      elsecmd(void *);
int      endifcmd(void *);
int      evalcol(int);
int      execute(char *, int);
int      exwrite(char *, FILE *, int);
void     fail(const char *, const char *);
int      file(void *);
struct grouphead *
         findgroup(char *);
void     findmail(char *, char *, int);
int      first(int, int);
void     fixhead(struct header *, struct name *);
void     fmt(const char *, struct name *, FILE *, int);
int      folders(void *);
int      forward(char *, FILE *, char *, int);
void     free_child(int);
int      from(void *);
off_t    fsize(FILE *);
int      getfold(char *, int);
int      gethfield(FILE *, char *, int, char **);
int      getmsglist(char *, int *, int);
int      getrawlist(char *, char **, int);
uid_t    getuserid(char *);
int      grabh(struct header *, int);
int      group(void *);
int      hash(const char *);
void     hdrstop(int);
int      headers(void *);
int      help(void *);
void     holdsigs(void);
int      ifcmd(void *);
int      igcomp(const void *, const void *);
int      igfield(void *);
int      ignore1(char **, struct ignoretab *, const char *);
int      igshow(struct ignoretab *, const char *);
int      inc(void *);
int      incfile(void);
void     intr(int);
int      isdate(char *);
int      isdir(char *);
int      isfileaddr(char *);
int      ishead(char *);
int      isign(const char *, struct ignoretab [2]);
int      isprefix(const char *, const char *);
void     istrncpy(char *, const char *, size_t);
const struct cmd *
         lex(char *);
void     load(char *);
struct var *
         lookup(const char *);
int      mail(struct name *,
            struct name *, struct name *, struct name *, char *, char *);
void     mail1(struct header *, int);
void     makemessage(FILE *, int);
void     mark(int);
int      markall(char *, int);
int      matchsender(char *, int);
int      matchfield(char *, int);
int      mboxit(void *);
int      member(char *, struct ignoretab *);
void     mesedit(FILE *, int);
void     mespipe(FILE *, char *);
int      messize(void *);
int      metamess(int, int);
int      more(void *);
int      newfileinfo(int);
int      next(void *);
int      null(void *);
void     parse(char *, struct headline *, char *);
int      pcmdlist(void *);
int      pdot(void *);
void     prepare_child(sigset_t *, int, int);
int      preserve(void *);
void     prettyprint(struct name *);
void     printgroup(char *);
void     printhead(int);
int      puthead(struct header *, FILE *, int);
int      putline(FILE *, char *, int);
int      pversion(void *);
void     quit(void);
int      quitcmd(void *);
int      readline(FILE *, char *, int);
void     register_file(FILE *, int, int);
void     regret(int);
void     relsesigs(void);
int      respond(void *);
int      retfield(void *);
int      rexit(void *);
int      rm(char *);
int      run_command(char *, sigset_t *, int, int, ...);
int      save(void *v);
int      save1(char *, int, const char *, struct ignoretab *);
void     savedeadletter(FILE *);
int      saveigfield(void *);
int      savemail(char *, FILE *);
int      saveretfield(void *);
int      scan(char **);
void     scaninit(void);
int      schdir(void *);
int      screensize(void);
int      scroll(void *);
int      sendmessage(struct message *, FILE *, struct ignoretab *, char *);
int      sendmail(void *);
int      set(void *);
int      setfile(char *);
void     setmsize(int);
void     setptr(FILE *, off_t);
void     setscreensize(void);
int      shell(void *);
void     sigchild(int);
void     sort(char **);
int      source(void *);
void     spreserve(void);
void     sreset(void);
int      start_command(char *, sigset_t *, int, int, ...);
void     statusput(struct message *, FILE *, char *);
void     stop(int);
int      stouch(void *);
int      swrite(void *);
void     tinit(void);
int      top(void *);
void     touch(struct message *);
void     ttyint(int);
void     ttystop(int);
int      type(void *);
int      type1(int *, int, int);
int      undeletecmd(void *);
void     unmark(int);
char    **unpack(struct name *);
int      unread(void *);
void     unregister_file(FILE *);
int      unset(void *);
int      unstack(void);
void     vfree(char *);
int      visual(void *);
int      wait_child(int);
int      wait_command(int);
int      writeback(FILE *);

extern char *__progname;
extern char *tmpdir;