usr/src/usr.bin/mail/fio.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)fio.c       5.23 (Berkeley) 6/25/90";
#endif /* not lint */

#include "rcv.h"
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/wait.h>
#include <errno.h>

/*
 * Mail -- a mail program
 *
 * File I/O.
 */

/*
 * Set up the input pointers while copying the mail file into
 * /tmp.
 */
setptr(ibuf)
        register FILE *ibuf;
{
        register c;
        register char *cp, *cp2;
        register count;
        char linebuf[LINESIZE];
        int maybe, inhead;
        FILE *mestmp;
        off_t offset;
        struct message this;
        extern char tempSet[];

        if ((c = opentemp(tempSet)) < 0)
                exit(1);
        if ((mestmp = Fdopen(c, "r+")) == NULL)
                panic("Can't open temporary");
        msgCount = 0;
        maybe = 1;
        inhead = 0;
        offset = 0;
        this.m_flag = MUSED|MNEW;
        this.m_size = 0;
        this.m_lines = 0;
        this.m_block = 0;
        this.m_offset = 0;
        for (;;) {
                if (fgets(linebuf, LINESIZE, ibuf) == NULL) {
                        if (append(&this, mestmp)) {
                                perror(tempSet);
                                exit(1);
                        }
                        makemessage(mestmp);
                        return;
                }
                count = strlen(linebuf);
                (void) fwrite(linebuf, sizeof *linebuf, count, otf);
                if (ferror(otf)) {
                        perror("/tmp");
                        exit(1);
                }
                linebuf[count - 1] = 0;
                if (maybe && linebuf[0] == 'F' && ishead(linebuf)) {
                        msgCount++;
                        if (append(&this, mestmp)) {
                                perror(tempSet);
                                exit(1);
                        }
                        this.m_flag = MUSED|MNEW;
                        this.m_size = 0;
                        this.m_lines = 0;
                        this.m_block = blockof(offset);
                        this.m_offset = offsetof(offset);
                        inhead = 1;
                } else if (linebuf[0] == 0) {
                        inhead = 0;
                } else if (inhead) {
                        for (cp = linebuf, cp2 = "status";; cp++) {
                                if ((c = *cp2++) == 0) {
                                        while (isspace(*cp++))
                                                ;
                                        if (cp[-1] != ':')
                                                break;
                                        while (c = *cp++)
                                                if (c == 'R')
                                                        this.m_flag |= MREAD;
                                                else if (c == 'O')
                                                        this.m_flag &= ~MNEW;
                                        inhead = 0;
                                        break;
                                }
                                if (*cp != c && *cp != toupper(c))
                                        break;
                        }
                }
                offset += count;
                this.m_size += count;
                this.m_lines++;
                maybe = linebuf[0] == 0;
        }
}

/*
 * Drop the passed line onto the passed output buffer.
 * If a write error occurs, return -1, else the count of
 * characters written, including the newline.
 */
putline(obuf, linebuf)
        FILE *obuf;
        char *linebuf;
{
        register int c;

        c = strlen(linebuf);
        (void) fwrite(linebuf, sizeof *linebuf, c, obuf);
        (void) putc('\n', obuf);
        if (ferror(obuf))
                return (-1);
        return (c + 1);
}

/*
 * Read up a line from the specified input into the line
 * buffer.  Return the number of characters read.  Do not
 * include the newline at the end.
 */
readline(ibuf, linebuf, linesize)
        FILE *ibuf;
        char *linebuf;
{
        register int n;

        clearerr(ibuf);
        if (fgets(linebuf, linesize, ibuf) == NULL)
                return -1;
        n = strlen(linebuf);
        if (n > 0 && linebuf[n - 1] == '\n')
                linebuf[--n] = '\0';
        return n;
}

/*
 * Return a file buffer all ready to read up the
 * passed message pointer.
 */
FILE *
setinput(mp)
        register struct message *mp;
{

        fflush(otf);
        if (fseek(itf, positionof(mp->m_block, mp->m_offset), 0) < 0) {
                perror("fseek");
                panic("temporary file seek");
        }
        return (itf);
}

/*
 * Take the data out of the passed ghost file and toss it into
 * a dynamically allocated message structure.
 */
makemessage(f)
        FILE *f;
{
        register size = (msgCount + 1) * sizeof (struct message);
        off_t lseek();

        if (message != 0)
                free((char *) message);
        if ((message = (struct message *) malloc((unsigned) size)) == 0)
                panic("Insufficient memory for %d messages", msgCount);
        dot = message;
        size -= sizeof (struct message);
        fflush(f);
        (void) lseek(fileno(f), (long) sizeof *message, 0);
        if (read(fileno(f), (char *) message, size) != size)
                panic("Message temporary file corrupted");
        message[msgCount].m_size = 0;
        message[msgCount].m_lines = 0;
        Fclose(f);
}

/*
 * Append the passed message descriptor onto the temp file.
 * If the write fails, return 1, else 0
 */
append(mp, f)
        struct message *mp;
        FILE *f;
{
        return fwrite((char *) mp, sizeof *mp, 1, f) != 1;
}

/*
 * Delete a file, but only if the file is a plain file.
 */
remove(name)
        char name[];
{
        struct stat statb;
        extern int errno;

        if (stat(name, &statb) < 0)
                return(-1);
        if ((statb.st_mode & S_IFMT) != S_IFREG) {
                errno = EISDIR;
                return(-1);
        }
        return unlink(name);
}

static int sigdepth;            /* depth of holdsigs() */
static int omask;
/*
 * Hold signals SIGHUP, SIGINT, and SIGQUIT.
 */
holdsigs()
{

        if (sigdepth++ == 0)
                omask = sigblock(sigmask(SIGHUP)|sigmask(SIGINT)|sigmask(SIGQUIT));
}

/*
 * Release signals SIGHUP, SIGINT, and SIGQUIT.
 */
relsesigs()
{

        if (--sigdepth == 0)
                sigsetmask(omask);
}

/*
 * Open a temp file by creating and unlinking.
 * Return the open file descriptor.
 */
opentemp(file)
        char file[];
{
        int f;

        if ((f = open(file, O_CREAT|O_EXCL|O_RDWR, 0600)) < 0)
                perror(file);
        remove(file);
        return (f);
}

/*
 * Determine the size of the file possessed by
 * the passed buffer.
 */
off_t
fsize(iob)
        FILE *iob;
{
        struct stat sbuf;

        if (fstat(fileno(iob), &sbuf) < 0)
                return 0;
        return sbuf.st_size;
}

/*
 * Evaluate the string given as a new mailbox name.
 * Supported meta characters:
 *      %       for my system mail box
 *      %user   for user's system mail box
 *      #       for previous file
 *      &       invoker's mbox file
 *      +file   file in folder directory
 *      any shell meta character
 * Return the file name as a dynamic string.
 */
char *
expand(name)
        register char *name;
{
        char xname[PATHSIZE];
        char cmdbuf[PATHSIZE];          /* also used for file names */
        register int pid, l;
        register char *cp, *shell;
        int pivec[2];
        struct stat sbuf;
        extern union wait wait_status;

        /*
         * The order of evaluation is "%" and "#" expand into constants.
         * "&" can expand into "+".  "+" can expand into shell meta characters.
         * Shell meta characters expand into constants.
         * This way, we make no recursive expansion.
         */
        switch (*name) {
        case '%':
                findmail(name[1] ? name + 1 : myname, xname);
                return savestr(xname);
        case '#':
                if (name[1] != 0)
                        break;
                if (prevfile[0] == 0) {
                        printf("No previous file\n");
                        return NOSTR;
                }
                return savestr(prevfile);
        case '&':
                if (name[1] == 0 && (name = value("MBOX")) == NOSTR)
                        name = "~/mbox";
                /* fall through */
        }
        if (name[0] == '+' && getfold(cmdbuf) >= 0) {
                sprintf(xname, "%s/%s", cmdbuf, name + 1);
                name = savestr(xname);
        }
        /* catch the most common shell meta character */
        if (name[0] == '~' && (name[1] == '/' || name[1] == '\0')) {
                sprintf(xname, "%s%s", homedir, name + 1);
                name = savestr(xname);
        }
        if (!anyof(name, "~{[*?$`'\"\\"))
                return name;
        if (pipe(pivec) < 0) {
                perror("pipe");
                return name;
        }
        sprintf(cmdbuf, "echo %s", name);
        if ((shell = value("SHELL")) == NOSTR)
                shell = _PATH_CSHELL;
        pid = start_command(shell, 0, -1, pivec[1], "-c", cmdbuf, NOSTR);
        if (pid < 0) {
                close(pivec[0]);
                close(pivec[1]);
                return NOSTR;
        }
        close(pivec[1]);
        l = read(pivec[0], xname, BUFSIZ);
        close(pivec[0]);
        if (wait_child(pid) < 0 && wait_status.w_termsig != SIGPIPE) {
                fprintf(stderr, "\"%s\": Expansion failed.\n", name);
                return NOSTR;
        }
        if (l < 0) {
                perror("read");
                return NOSTR;
        }
        if (l == 0) {
                fprintf(stderr, "\"%s\": No match.\n", name);
                return NOSTR;
        }
        if (l == BUFSIZ) {
                fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
                return NOSTR;
        }
        xname[l] = 0;
        for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
                ;
        cp[1] = '\0';
        if (index(xname, ' ') && stat(xname, &sbuf) < 0) {
                fprintf(stderr, "\"%s\": Ambiguous.\n", name);
                return NOSTR;
        }
        return savestr(xname);
}

/*
 * Determine the current folder directory name.
 */
getfold(name)
        char *name;
{
        char *folder;

        if ((folder = value("folder")) == NOSTR)
                return (-1);
        if (*folder == '/')
                strcpy(name, folder);
        else
                sprintf(name, "%s/%s", homedir, folder);
        return (0);
}

/*
 * Return the name of the dead.letter file.
 */
char *
getdeadletter()
{
        register char *cp;

        if ((cp = value("DEAD")) == NOSTR || (cp = expand(cp)) == NOSTR)
                cp = expand("~/dead.letter");
        else if (*cp != '/') {
                char buf[PATHSIZE];

                (void) sprintf(buf, "~/%s", cp);
                cp = expand(buf);
        }
        return cp;
}