nail.h: use MAXPATHLEN as fallback for struct cw

[s-mailx.git] / names.c

/*@ S-nail - a mail user agent derived from Berkeley Mail.
 *@ Handle name lists, alias expansion, outof(): serve file / pipe addresses
 *
 * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
 * Copyright (c) 2012 - 2013 Steffen "Daode" Nurpmeso <sdaoden@users.sf.net>.
 */
/*
 * Copyright (c) 1980, 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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.
 */

#include "nail.h"

#include <fcntl.h>

/* Same name, taking care for *allnet*? */
static int              same_name(char const *n1, char const *n2);
/* Delete the given name from a namelist */
static struct name *    delname(struct name *np, char const *name);
/* Put another node onto a list of names and return the list */
static struct name *    put(struct name *list, struct name *node);
/* Grab a single name (liberal name) */
static char const *     yankname(char const *ap, char *wbuf,
                                char const *separators, int keepcomms);
/* Extraction multiplexer that splits an input line to names */
static struct name *    extract1(char const *line, enum gfield ntype,
                                char const *separators, int keepcomms);
/* Recursively expand a group name.  We limit the expansion to some fixed level
 * to keep things from going haywire.  Direct recursion is not expanded for
 * convenience */
static struct name *    gexpand(struct name *nlist, struct grouphead *gh,
                                int metoo, int ntype);

static void             _remove_grouplist(struct grouphead *gh);

static int
same_name(char const *n1, char const *n2)
{
        int ret = 0;
        char c1, c2;

        if (value("allnet") != NULL) {
                do {
                        c1 = *n1++;
                        c2 = *n2++;
                        c1 = lowerconv(c1);
                        c2 = lowerconv(c2);
                        if (c1 != c2)
                                goto jleave;
                } while (c1 != '\0' && c2 != '\0' && c1 != '@' && c2 != '@');
                ret = 1;
        } else
                ret = (asccasecmp(n1, n2) == 0);
jleave:
        return (ret);
}

static struct name *
delname(struct name *np, char const *name)
{
        struct name *p;

        for (p = np; p != NULL; p = p->n_flink)
                if (same_name(p->n_name, name)) {
                        if (p->n_blink == NULL) {
                                if (p->n_flink != NULL)
                                        p->n_flink->n_blink = NULL;
                                np = p->n_flink;
                                continue;
                        }
                        if (p->n_flink == NULL) {
                                if (p->n_blink != NULL)
                                        p->n_blink->n_flink = NULL;
                                continue;
                        }
                        p->n_blink->n_flink = p->n_flink;
                        p->n_flink->n_blink = p->n_blink;
                }
        return (np);
}

static struct name *
put(struct name *list, struct name *node)
{
        node->n_flink = list;
        node->n_blink = NULL;
        if (list != NULL)
                list->n_blink = node;
        return (node);
}

static char const *
yankname(char const *ap, char *wbuf, char const *separators, int keepcomms)
{
        char const *cp;
        char *wp, c, inquote, lc, lastsp;

        *(wp = wbuf) = '\0';

        /* Skip over intermediate list trash, as in ".org>  ,  <xy@zz.org>" */
        for (c = *ap; blankchar(c) || c == ','; c = *++ap)
                ;
        if (c == '\0') {
                cp = NULL;
                goto jleave;
        }

        /*
         * Parse a full name: TODO RFC 5322
         * - Keep everything in quotes, liberal handle *quoted-pair*s therein
         * - Skip entire (nested) comments
         * - In non-quote, non-comment, join adjacent space to a single SP
         * - Understand separators only in non-quote, non-comment context,
         *   and only if not part of a *quoted-pair* (XXX too liberal)
         */
        cp = ap;
        for (inquote = lc = lastsp = 0;; lc = c, ++cp) {
                c = *cp;
                if (c == '\0')
                        break;
                if (c == '\\') {
                        lastsp = 0;
                        continue;
                }
                if (c == '"') {
                        if (lc != '\\')
                                inquote = ! inquote;
#if 0 /* TODO when doing real RFC 5322 parsers - why have i done this? */
                        else
                                --wp;
#endif
                        goto jwpwc;
                }
                if (inquote || lc == '\\') {
jwpwc:                  *wp++ = c;
                        lastsp = 0;
                        continue;
                }
                if (c == '(') {
                        ap = cp;
                        cp = skip_comment(cp + 1);
                        if (keepcomms)
                                while (ap < cp)
                                        *wp++ = *ap++;
                        --cp;
                        lastsp = 0;
                        continue;
                }
                if (strchr(separators, c) != NULL)
                        break;

                lc = lastsp;
                lastsp = blankchar(c);
                if (! lastsp || ! lc)
                        *wp++ = c;
        }
        if (blankchar(lc))
                --wp;

        *wp = '\0';
jleave:
        return (cp);
}

static struct name *
extract1(char const *line, enum gfield ntype, char const *separators,
        int keepcomms)
{
        struct name *topp, *np, *t;
        char const *cp;
        char *nbuf;

        topp = NULL;
        if (line == NULL || *line == '\0')
                goto jleave;

        np = NULL;
        cp = line;
        nbuf = ac_alloc(strlen(line) + 1);
        while ((cp = yankname(cp, nbuf, separators, keepcomms)) != NULL) {
                t = nalloc(nbuf, ntype);
                if (topp == NULL)
                        topp = t;
                else
                        np->n_flink = t;
                t->n_blink = np;
                np = t;
        }
        ac_free(nbuf);

jleave:
        return topp;
}

static struct name *
gexpand(struct name *nlist, struct grouphead *gh, int metoo, int ntype)
{
        struct group *gp;
        struct grouphead *ngh;
        struct name *np;
        static int depth;
        char *cp;

        if (depth > MAXEXP) {
                printf(tr(150, "Expanding alias to depth larger than %d\n"),
                        MAXEXP);
                goto jleave;
        }
        depth++;

        for (gp = gh->g_list; gp != NULL; gp = gp->ge_link) {
                cp = gp->ge_name;
                if (*cp == '\\')
                        goto quote;
                if (strcmp(cp, gh->g_name) == 0)
                        goto quote;
                if ((ngh = findgroup(cp)) != NULL) {
                        /* For S-nail(1), the "group" may *be* the sender in
                         * that a name maps to a full address specification */
                        if (! metoo && ngh->g_list->ge_link == NULL &&
                                        same_name(cp, myname))
                                continue;
                        nlist = gexpand(nlist, ngh, metoo, ntype);
                        continue;
                }
quote:
                np = nalloc(cp, ntype|GFULL);
                /*
                 * At this point should allow to expand
                 * to self if only person in group
                 */
                if (gp == gh->g_list && gp->ge_link == NULL)
                        goto skip;
                if (! metoo && same_name(cp, myname))
                        np->n_type |= GDEL;
skip:
                nlist = put(nlist, np);
        }
        --depth;
jleave:
        return (nlist);
}

static void
_remove_grouplist(struct grouphead *gh)
{
        struct group *gp, *gq;

        if ((gp = gh->g_list) != NULL) {
                for (; gp; gp = gq) {
                        gq = gp->ge_link;
                        free(gp->ge_name);
                        free(gp);
                }
        }
}

/*
 * Allocate a single element of a name list, initialize its name field to the
 * passed name and return it.
 */
struct name *
nalloc(char *str, enum gfield ntype)
{
        struct addrguts ag;
        struct str in, out;
        struct name *np;

        np = (struct name*)salloc(sizeof *np);
        np->n_flink = NULL;
        np->n_blink = NULL;
        np->n_type = ntype;
        np->n_flags = 0;

        (void)addrspec_with_guts((ntype & (GFULL|GSKIN|GREF)) != 0, str, &ag);
        if ((ag.ag_n_flags & NAME_NAME_SALLOC) == 0) {
                ag.ag_n_flags |= NAME_NAME_SALLOC;
                ag.ag_skinned = savestrbuf(ag.ag_skinned, ag.ag_slen);
        }
        np->n_fullname = np->n_name = ag.ag_skinned;
        np->n_flags = ag.ag_n_flags;

        if (ntype & GFULL) {
                if (ag.ag_ilen == ag.ag_slen
#ifdef HAVE_IDNA
                                && (ag.ag_n_flags & NAME_IDNA) == 0
#endif
                )
                        goto jleave;
                if (ag.ag_n_flags & NAME_ADDRSPEC_ISFILEORPIPE)
                        goto jleave;
#ifdef HAVE_IDNA
                if ((ag.ag_n_flags & NAME_IDNA) == 0) {
#endif
                        in.s = str;
                        in.l = ag.ag_ilen;
#ifdef HAVE_IDNA
                } else {
                        /*
                         * The domain name was IDNA and has been converted.
                         * We also have to ensure that the domain name in
                         * .n_fullname is replaced with the converted version,
                         * since MIME doesn't perform encoding of addresses.
                         */
                        size_t l = ag.ag_iaddr_start,
                                lsuff = ag.ag_ilen - ag.ag_iaddr_aend;
                        in.s = ac_alloc(l + ag.ag_slen + lsuff + 1);
                        memcpy(in.s, str, l);
                        memcpy(in.s + l, ag.ag_skinned, ag.ag_slen);
                        l += ag.ag_slen;
                        memcpy(in.s + l, str + ag.ag_iaddr_aend, lsuff);
                        l += lsuff;
                        in.s[l] = '\0';
                        in.l = l;
                }
#endif
                mime_fromhdr(&in, &out, TD_ISPR|TD_ICONV);
                np->n_fullname = savestr(out.s);
                free(out.s);
#ifdef HAVE_IDNA
                if (ag.ag_n_flags & NAME_IDNA)
                        ac_free(in.s);
#endif
                np->n_flags |= NAME_FULLNAME_SALLOC;
        } else if (ntype & GREF) { /* TODO LEGACY */
                /* TODO Unfortunately we had to skin GREFerences i.e. the
                 * TODO surrounding angle brackets have been stripped away.
                 * TODO Necessarily since otherwise the plain address check
                 * TODO fails due to them; insert them back so that valid
                 * TODO headers will be created */
                np->n_fullname = np->n_name = str = salloc(ag.ag_slen + 2 + 1);
                *(str++) = '<';
                memcpy(str, ag.ag_skinned, ag.ag_slen);
                str += ag.ag_slen;
                *(str++) = '>';
                *str = '\0';
        }
jleave:
        return (np);
}

struct name *
ndup(struct name *np, enum gfield ntype)
{
        struct name *nnp;

        if ((ntype & (GFULL|GSKIN)) && (np->n_flags & NAME_SKINNED) == 0) {
                nnp = nalloc(np->n_name, ntype);
                goto jleave;
        }

        nnp = (struct name*)salloc(sizeof *np);
        nnp->n_flink = nnp->n_blink = NULL;
        nnp->n_type = ntype;
        nnp->n_flags = (np->n_flags &
                        ~(NAME_NAME_SALLOC | NAME_FULLNAME_SALLOC)) |
                NAME_NAME_SALLOC;
        nnp->n_name = savestr(np->n_name);
        if (np->n_name == np->n_fullname || (ntype & (GFULL|GSKIN)) == 0)
                nnp->n_fullname = nnp->n_name;
        else {
                nnp->n_flags |= NAME_FULLNAME_SALLOC;
                nnp->n_fullname = savestr(np->n_fullname);
        }
jleave:
        return (nnp);
}

/*
 * Concatenate the two passed name lists, return the result.
 */
struct name *
cat(struct name *n1, struct name *n2)
{
        struct name *tail;

        if (n1 == NULL)
                return (n2);
        if (n2 == NULL)
                return (n1);

        tail = n1;
        while (tail->n_flink != NULL)
                tail = tail->n_flink;
        tail->n_flink = n2;
        n2->n_blink = tail;
        return (n1);
}

/*
 * Determine the number of undeleted elements in
 * a name list and return it.
 */
int
count(struct name const*np)
{
        int c;

        for (c = 0; np != NULL; np = np->n_flink)
                if ((np->n_type & GDEL) == 0)
                        c++;
        return (c);
}

/*
 * Extract a list of names from a line,
 * and make a list of names from it.
 * Return the list or NULL if none found.
 */
struct name *
extract(char const *line, enum gfield ntype)
{
        return extract1(line, ntype, " \t,", 0);
}

struct name *
lextract(char const *line, enum gfield ntype)
{
        return ((line && strpbrk(line, ",\"\\(<|")) ?
                extract1(line, ntype, ",", 1) : extract(line, ntype));
}

/*
 * Turn a list of names into a string of the same names.
 */
char *
detract(struct name *np, enum gfield ntype)
{
        char *topp, *cp;
        struct name *p;
        int comma, s;

        topp = NULL;
        if (np == NULL)
                goto jleave;

        comma = ntype & GCOMMA;
        ntype &= ~GCOMMA;
        s = 0;
        if ((options & OPT_DEBUG) && comma)
                fprintf(stderr, tr(145, "detract asked to insert commas\n"));
        for (p = np; p != NULL; p = p->n_flink) {
                if (ntype && (p->n_type & GMASK) != ntype)
                        continue;
                s += strlen(p->n_fullname) + 1;
                if (comma)
                        s++;
        }
        if (s == 0)
                goto jleave;

        s += 2;
        topp = salloc(s);
        cp = topp;
        for (p = np; p != NULL; p = p->n_flink) {
                if (ntype && (p->n_type & GMASK) != ntype)
                        continue;
                cp = sstpcpy(cp, p->n_fullname);
                if (comma && p->n_flink != NULL)
                        *cp++ = ',';
                *cp++ = ' ';
        }
        *--cp = 0;
        if (comma && *--cp == ',')
                *cp = 0;
jleave:
        return topp;
}

struct name *
grab_names(const char *field, struct name *np, int comma, enum gfield gflags)
{
        struct name *nq;
jloop:
        np = lextract(readstr_input(field, detract(np, comma)), gflags);
        for (nq = np; nq != NULL; nq = nq->n_flink)
                if (is_addr_invalid(nq, 1))
                        goto jloop;
        return np;
}

/*
 * Check all addresses in np and delete invalid ones.
 */
struct name *
checkaddrs(struct name *np)
{
        struct name *n;

        for (n = np; n != NULL;) {
                if (is_addr_invalid(n, 1)) {
                        if (n->n_blink)
                                n->n_blink->n_flink = n->n_flink;
                        if (n->n_flink)
                                n->n_flink->n_blink = n->n_blink;
                        if (n == np)
                                np = n->n_flink;
                }
                n = n->n_flink;
        }
        return (np);
}

/*
 * Map all of the aliased users in the invoker's mailrc
 * file and insert them into the list.
 * Changed after all these months of service to recursively
 * expand names (2/14/80).
 */
struct name *
usermap(struct name *names, bool_t force_metoo)
{
        struct name *new, *np, *cp;
        struct grouphead *gh;
        int metoo;

        new = NULL;
        np = names;
        metoo = (force_metoo || value("metoo") != NULL);
        while (np != NULL) {
                assert((np->n_type & GDEL) == 0); /* TODO legacy */
                if (is_fileorpipe_addr(np) || np->n_name[0] == '\\') {
                        cp = np->n_flink;
                        new = put(new, np);
                        np = cp;
                        continue;
                }
                gh = findgroup(np->n_name);
                cp = np->n_flink;
                if (gh != NULL)
                        new = gexpand(new, gh, metoo, np->n_type);
                else
                        new = put(new, np);
                np = cp;
        }
        return new;
}

/*
 * Remove all of the duplicates from the passed name list by
 * insertion sorting them, then checking for dups.
 * Return the head of the new list.
 */
struct name *
elide(struct name *names)
{
        struct name *np, *t, *newn, *x;

        if (names == NULL)
                return (NULL);
        /* Throw away all deleted nodes (XXX merge with plain sort below?) */
        for (newn = np = NULL; names != NULL; names = names->n_flink)
                if  ((names->n_type & GDEL) == 0) {
                        names->n_blink = np;
                        if (np)
                                np->n_flink = names;
                        else
                                newn = names;
                        np = names;
                }
        if (newn == NULL)
                return (NULL);

        np = newn->n_flink;
        if (np != NULL)
                np->n_blink = NULL;
        newn->n_flink = NULL;

        while (np != NULL) {
                t = newn;
                while (asccasecmp(t->n_name, np->n_name) < 0) {
                        if (t->n_flink == NULL)
                                break;
                        t = t->n_flink;
                }

                /*
                 * If we ran out of t's, put the new entry after
                 * the current value of t.
                 */

                if (asccasecmp(t->n_name, np->n_name) < 0) {
                        t->n_flink = np;
                        np->n_blink = t;
                        t = np;
                        np = np->n_flink;
                        t->n_flink = NULL;
                        continue;
                }

                /*
                 * Otherwise, put the new entry in front of the
                 * current t.  If at the front of the list,
                 * the new guy becomes the new head of the list.
                 */

                if (t == newn) {
                        t = np;
                        np = np->n_flink;
                        t->n_flink = newn;
                        newn->n_blink = t;
                        t->n_blink = NULL;
                        newn = t;
                        continue;
                }

                /*
                 * The normal case -- we are inserting into the
                 * middle of the list.
                 */

                x = np;
                np = np->n_flink;
                x->n_flink = t;
                x->n_blink = t->n_blink;
                t->n_blink->n_flink = x;
                t->n_blink = x;
        }

        /*
         * Now the list headed up by new is sorted.
         * Go through it and remove duplicates.
         */

        np = newn;
        while (np != NULL) {
                t = np;
                while (t->n_flink != NULL &&
                                asccasecmp(np->n_name, t->n_flink->n_name) == 0)
                        t = t->n_flink;
                if (t == np) {
                        np = np->n_flink;
                        continue;
                }

                /*
                 * Now t points to the last entry with the same name
                 * as np.  Make np point beyond t.
                 */

                np->n_flink = t->n_flink;
                if (t->n_flink != NULL)
                        t->n_flink->n_blink = np;
                np = np->n_flink;
        }
        return (newn);
}

struct name *
delete_alternates(struct name *np)
{
        struct name *xp;
        char **ap;

        np = delname(np, myname);
        if (altnames)
                for (ap = altnames; *ap; ap++)
                        np = delname(np, *ap);
        if ((xp = lextract(value("from"), GEXTRA|GSKIN)) != NULL)
                while (xp) {
                        np = delname(np, xp->n_name);
                        xp = xp->n_flink;
                }
        if ((xp = lextract(value("replyto"), GEXTRA|GSKIN)) != NULL)
                while (xp) {
                        np = delname(np, xp->n_name);
                        xp = xp->n_flink;
                }
        if ((xp = extract(value("sender"), GEXTRA|GSKIN)) != NULL)
                while (xp) {
                        np = delname(np, xp->n_name);
                        xp = xp->n_flink;
                }
        return (np);
}

int
is_myname(char const *name)
{
        int ret = 1;
        struct name *xp;
        char **ap;

        if (same_name(myname, name))
                goto jleave;
        if (altnames)
                for (ap = altnames; *ap; ap++)
                        if (same_name(*ap, name))
                                goto jleave;
        if ((xp = lextract(value("from"), GEXTRA|GSKIN)) != NULL)
                while (xp) {
                        if (same_name(xp->n_name, name))
                                goto jleave;
                        xp = xp->n_flink;
                }
        if ((xp = lextract(value("replyto"), GEXTRA|GSKIN)) != NULL)
                while (xp) {
                        if (same_name(xp->n_name, name))
                                goto jleave;
                        xp = xp->n_flink;
                }
        if ((xp = extract(value("sender"), GEXTRA|GSKIN)) != NULL)
                while (xp) {
                        if (same_name(xp->n_name, name))
                                goto jleave;
                        xp = xp->n_flink;
                }
        ret = 0;
jleave:
        return (ret);
}

/*
 * For each recipient in the passed name list with a /
 * in the name, append the message to the end of the named file
 * and remove him from the recipient list.
 *
 * Recipients whose name begins with | are piped through the given
 * program and removed.
 */
struct name *
outof(struct name *names, FILE *fo, struct header *hp, bool_t *senderror)
{
        int pipecnt, xcnt, *fda, i;
        char const *sh;
        struct name *np;
        FILE *fin = NULL, *fout;
        (void)hp;

        /*
         * Look through all recipients and do a quick return if no file or pipe
         * addressee is found.
         */
        fda = NULL; /* Silence cc */
        for (pipecnt = xcnt = 0, np = names; np != NULL; np = np->n_flink)
                switch (np->n_flags & NAME_ADDRSPEC_ISFILEORPIPE) {
                case NAME_ADDRSPEC_ISFILE:
                        ++xcnt;
                        break;
                case NAME_ADDRSPEC_ISPIPE:
                        ++pipecnt;
                        break;
                }
        if (pipecnt == 0 && xcnt == 0)
                goto jleave;

        /*
         * Otherwise create an array of file descriptors for each found pipe
         * addressee to get around the dup(2)-shared-file-offset problem, i.e.,
         * each pipe subprocess needs its very own file descriptor, and we need
         * to deal with that.
         * To make our life a bit easier let's just use the auto-reclaimed
         * string storage.
         */
        if (pipecnt == 0) {
                fda = NULL;
                sh = NULL;
        } else {
                fda = (int*)salloc(sizeof(int) * pipecnt);
                for (i = 0; i < pipecnt; ++i)
                        fda[i] = -1;
                if ((sh = value("SHELL")) == NULL)
                        sh = SHELL;
        }

        for (np = names; np != NULL;) {
                if ((np->n_flags & (NAME_ADDRSPEC_ISFILE|NAME_ADDRSPEC_ISPIPE))
                                == 0) {
                        np = np->n_flink;
                        continue;
                }

                /*
                 * See if we have copied the complete message out yet.
                 * If not, do so.
                 */
                if (image < 0) {
                        int c;
                        char *tempEdit;

                        /* XXX tempEdit unlink racy - block signals, at least */
                        if ((fout = Ftemp(&tempEdit, "Re", "w", 0600, 1))
                                        == NULL) {
                                perror(tr(146, "Creation of temporary image"));
                                *senderror = TRU1;
                                goto jcant;
                        }
                        image = open(tempEdit, O_RDWR);
                        if (image >= 0)
                                for (i = 0; i < pipecnt; ++i) {
                                        int fd = open(tempEdit, O_RDONLY);
                                        if (fd < 0) {
                                                (void)close(image);
                                                image = -1;
                                                pipecnt = i;
                                                break;
                                        }
                                        fda[i] = fd;
                                        (void)fcntl(fd, F_SETFD, FD_CLOEXEC);
                                }
                        unlink(tempEdit);
                        Ftfree(&tempEdit);
                        if (image < 0) {
                                perror(tr(147, "Creating descriptor duplicate "
                                        "of temporary image"));
                                *senderror = TRU1;
                                Fclose(fout);
                                goto jcant;
                        }
                        (void)fcntl(image, F_SETFD, FD_CLOEXEC);

                        fprintf(fout, "From %s %s",
                                myname, time_current.tc_ctime);
                        c = EOF;
                        while (i = c, (c = getc(fo)) != EOF)
                                putc(c, fout);
                        rewind(fo);
                        if (i != '\n')
                                putc('\n', fout);
                        putc('\n', fout);
                        fflush(fout);
                        if (ferror(fout)) {
                                perror(tr(148, "Finalizing write of temporary "
                                        "image"));
                                Fclose(fout);
                                goto jcantfout;
                        }
                        Fclose(fout);

                        /* If we have to serve file addressees, open reader */
                        if (xcnt != 0 && (fin = Fdopen(image, "r")) == NULL) {
                                perror(tr(149, "Failed to open a duplicate of "
                                        "the temporary image"));
jcantfout:                      *senderror = TRU1;
                                (void)close(image);
                                image = -1;
                                goto jcant;
                        }

                        /* From now on use xcnt as a counter for pipecnt */
                        xcnt = 0;
                }

                /*
                 * Now either copy "image" to the desired file
                 * or give it as the standard input to the desired
                 * program as appropriate.
                 */

                if (np->n_flags & NAME_ADDRSPEC_ISPIPE) {
                        int pid;
                        sigset_t nset;

                        sigemptyset(&nset);
                        sigaddset(&nset, SIGHUP);
                        sigaddset(&nset, SIGINT);
                        sigaddset(&nset, SIGQUIT);
                        pid = start_command(sh, &nset,
                                fda[xcnt++], -1, "-c", np->n_name + 1, NULL);
                        if (pid < 0) {
                                fprintf(stderr, tr(281,
                                        "Message piping to <%s> failed\n"),
                                        np->n_name);
                                *senderror = TRU1;
                                goto jcant;
                        }
                        free_child(pid);
                } else {
                        char *fname = file_expand(np->n_name);
                        if (fname == NULL) {
                                *senderror = TRU1;
                                goto jcant;
                        }
                        if ((fout = Zopen(fname, "a", NULL)) == NULL) {
                                fprintf(stderr, tr(282,
                                        "Message writing to <%s> failed: %s\n"),
                                        fname, strerror(errno));
                                *senderror = TRU1;
                                goto jcant;
                        }
                        rewind(fin);
                        while ((i = getc(fin)) != EOF)
                                putc(i, fout);
                        if (ferror(fout)) {
                                fprintf(stderr, tr(282,
                                        "Message writing to <%s> failed: %s\n"),
                                        fname, tr(283, "write error"));
                                *senderror = TRU1;
                        }
                        Fclose(fout);
                }
jcant:
                /*
                 * In days of old we removed the entry from the
                 * the list; now for sake of header expansion
                 * we leave it in and mark it as deleted.
                 */
                np->n_type |= GDEL;
                np = np->n_flink;
                if (image < 0)
                        goto jdelall;
        }
jleave:
        if (fin != NULL)
                Fclose(fin);
        for (i = 0; i < pipecnt; ++i)
                (void)close(fda[i]);
        if (image >= 0) {
                close(image);
                image = -1;
        }
        return (names);

jdelall:
        while (np != NULL) {
                if ((np->n_flags & (NAME_ADDRSPEC_ISFILE|NAME_ADDRSPEC_ISPIPE))
                                != 0)
                        np->n_type |= GDEL;
                np = np->n_flink;
        }
        goto jleave;
}

struct grouphead *
findgroup(char *name)
{
        struct grouphead *gh;

        for (gh = groups[hash(name)]; gh != NULL; gh = gh->g_link)
                if (*gh->g_name == *name && strcmp(gh->g_name, name) == 0)
                        return(gh);
        return(NULL);
}

void
printgroup(char *name)
{
        struct grouphead *gh;
        struct group *gp;

        if ((gh = findgroup(name)) == NULL) {
                fprintf(stderr, tr(202, "\"%s\": no such alias\n"), name);
                return;
        }
        printf("%s\t", gh->g_name);
        for (gp = gh->g_list; gp != NULL; gp = gp->ge_link)
                printf(" %s", gp->ge_name);
        putchar('\n');
}

void
remove_group(const char *name)
{
        struct grouphead *gh, *gp = NULL;
        int h = hash(name);

        for (gh = groups[h]; gh != NULL; gh = gh->g_link) {
                if (*gh->g_name == *name && strcmp(gh->g_name, name) == 0) {
                        _remove_grouplist(gh);
                        free(gh->g_name);
                        if (gp != NULL)
                                gp->g_link = gh->g_link;
                        else
                                groups[h] = NULL;
                        free(gh);
                        break;
                }
                gp = gh;
        }
}