OpenBSD-4.6/usr.bin/mail/aux.c
/* $OpenBSD: aux.c,v 1.24 2008/07/16 14:53:41 martynas Exp $ */
/* $NetBSD: aux.c,v 1.5 1997/05/13 06:15:52 mikel Exp $ */
/*
* 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. 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.
*/
#ifndef lint
#if 0
static const char sccsid[] = "@(#)aux.c 8.1 (Berkeley) 6/6/93";
#else
static const char rcsid[] = "$OpenBSD: aux.c,v 1.24 2008/07/16 14:53:41 martynas Exp $";
#endif
#endif /* not lint */
#include "rcv.h"
#include "extern.h"
/*
* Mail -- a mail program
*
* Auxiliary functions.
*/
static char *save2str(char *, char *);
/*
* Return a pointer to a dynamic copy of the argument.
*/
char *
savestr(char *str)
{
char *new;
int size = strlen(str) + 1;
if ((new = salloc(size)) != NULL)
(void)memcpy(new, str, size);
return(new);
}
/*
* Make a copy of new argument incorporating old one.
*/
static char *
save2str(char *str, char *old)
{
char *new;
int newsize = strlen(str) + 1;
int oldsize = old ? strlen(old) + 1 : 0;
if ((new = salloc(newsize + oldsize)) != NULL) {
if (oldsize) {
(void)memcpy(new, old, oldsize);
new[oldsize - 1] = ' ';
}
(void)memcpy(new + oldsize, str, newsize);
}
return(new);
}
/*
* Touch the named message by setting its MTOUCH flag.
* Touched messages have the effect of not being sent
* back to the system mailbox on exit.
*/
void
touch(struct message *mp)
{
mp->m_flag |= MTOUCH;
if ((mp->m_flag & MREAD) == 0)
mp->m_flag |= MREAD|MSTATUS;
}
/*
* Test to see if the passed file name is a directory.
* Return true if it is.
*/
int
isdir(char *name)
{
struct stat sbuf;
if (stat(name, &sbuf) < 0)
return(0);
return(S_ISDIR(sbuf.st_mode));
}
/*
* Count the number of arguments in the given string raw list.
*/
int
argcount(char **argv)
{
char **ap;
for (ap = argv; *ap++ != NULL;)
;
return(ap - argv - 1);
}
/*
* Return the desired header line from the passed message
* pointer (or NULL if the desired header field is not available).
*/
char *
hfield(char *field, struct message *mp)
{
FILE *ibuf;
char linebuf[LINESIZE];
int lc;
char *hfield;
char *colon, *oldhfield = NULL;
ibuf = setinput(mp);
if ((lc = mp->m_lines - 1) < 0)
return(NULL);
if (readline(ibuf, linebuf, LINESIZE, NULL) < 0)
return(NULL);
while (lc > 0) {
if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
return(oldhfield);
if ((hfield = ishfield(linebuf, colon, field)) != NULL)
oldhfield = save2str(hfield, oldhfield);
}
return(oldhfield);
}
/*
* Return the next header field found in the given message.
* Return >= 0 if something found, < 0 elsewise.
* "colon" is set to point to the colon in the header.
* Must deal with \ continuations & other such fraud.
*/
int
gethfield(FILE *f, char *linebuf, int rem, char **colon)
{
char line2[LINESIZE];
char *cp, *cp2;
int c;
for (;;) {
if (--rem < 0)
return(-1);
if ((c = readline(f, linebuf, LINESIZE, NULL)) <= 0)
return(-1);
for (cp = linebuf; isprint(*cp) && *cp != ' ' && *cp != ':';
cp++)
;
if (*cp != ':' || cp == linebuf)
continue;
/*
* I guess we got a headline.
* Handle wraparounding
*/
*colon = cp;
cp = linebuf + c;
for (;;) {
while (--cp >= linebuf && (*cp == ' ' || *cp == '\t'))
;
cp++;
if (rem <= 0)
break;
ungetc(c = getc(f), f);
if (c != ' ' && c != '\t')
break;
if ((c = readline(f, line2, LINESIZE, NULL)) < 0)
break;
rem--;
for (cp2 = line2; *cp2 == ' ' || *cp2 == '\t'; cp2++)
;
c -= cp2 - line2;
if (cp + c >= linebuf + LINESIZE - 2)
break;
*cp++ = ' ';
(void)memcpy(cp, cp2, c);
cp += c;
}
*cp = 0;
return(rem);
}
/* NOTREACHED */
}
/*
* Check whether the passed line is a header line of
* the desired breed. Return the field body, or 0.
*/
char*
ishfield(char *linebuf, char *colon, char *field)
{
char *cp = colon;
*cp = 0;
if (strcasecmp(linebuf, field) != 0) {
*cp = ':';
return(0);
}
*cp = ':';
for (cp++; *cp == ' ' || *cp == '\t'; cp++)
;
return(cp);
}
/*
* Copy a string, lowercasing it as we go. ``dsize'' should be
* the real size (not len) of the dest string (guarantee NUL term).
*/
size_t
istrlcpy(char *dst, const char *src, size_t dsize)
{
char *d = dst;
const char *s = src;
size_t n = dsize;
/* Copy as many bytes as will fit */
if (n != 0 && --n != 0) {
do {
if ((*d++ = tolower(*s++)) == 0)
break;
} while (--n != 0);
}
/* Not enough room in dst, add NUL and traverse rest of src */
if (n == 0) {
if (dsize != 0)
*d = '\0'; /* NUL-terminate dst */
while (*s++)
;
}
return(s - src - 1); /* count does not include NUL */
}
/*
* The following code deals with input stacking to do source
* commands. All but the current file pointer are saved on
* the stack.
*/
static int ssp; /* Top of file stack */
struct sstack {
FILE *s_file; /* File we were in. */
int s_cond; /* Saved state of conditionals */
int s_loading; /* Loading .mailrc, etc. */
} sstack[NOFILE];
/*
* Pushdown current input file and switch to a new one.
* Set the global flag "sourcing" so that others will realize
* that they are no longer reading from a tty (in all probability).
*/
int
source(void *v)
{
char **arglist = v;
FILE *fi;
char *cp;
if ((cp = expand(*arglist)) == NULL)
return(1);
if ((fi = Fopen(cp, "r")) == NULL) {
warn("%s", cp);
return(1);
}
if (ssp >= NOFILE - 1) {
puts("Too much \"sourcing\" going on.");
(void)Fclose(fi);
return(1);
}
sstack[ssp].s_file = input;
sstack[ssp].s_cond = cond;
sstack[ssp].s_loading = loading;
ssp++;
loading = 0;
cond = CANY;
input = fi;
sourcing++;
return(0);
}
/*
* Pop the current input back to the previous level.
* Update the "sourcing" flag as appropriate.
*/
int
unstack(void)
{
if (ssp <= 0) {
puts("\"Source\" stack over-pop.");
sourcing = 0;
return(1);
}
(void)Fclose(input);
if (cond != CANY)
puts("Unmatched \"if\"");
ssp--;
cond = sstack[ssp].s_cond;
loading = sstack[ssp].s_loading;
input = sstack[ssp].s_file;
if (ssp == 0)
sourcing = loading;
return(0);
}
/*
* Touch the indicated file.
* This is nifty for the shell.
*/
void
alter(char *name)
{
struct stat sb;
struct timeval tv[2];
if (stat(name, &sb))
return;
(void) gettimeofday(&tv[0], (struct timezone *)0);
tv[0].tv_sec++;
#ifdef TIMESPEC_TO_TIMEVAL
TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
#else
tv[1].tv_sec = sb.st_mtime;
#endif
(void)utimes(name, tv);
}
/*
* Examine the passed line buffer and
* return true if it is all blanks and tabs.
*/
int
blankline(char *linebuf)
{
char *cp;
for (cp = linebuf; *cp; cp++)
if (*cp != ' ' && *cp != '\t')
return(0);
return(1);
}
/*
* Get sender's name from this message. If the message has
* a bunch of arpanet stuff in it, we may have to skin the name
* before returning it.
*/
char *
nameof(struct message *mp, int reptype)
{
char *cp, *cp2;
cp = skin(name1(mp, reptype));
if (reptype != 0 || charcount(cp, '!') < 2)
return(cp);
cp2 = strrchr(cp, '!');
cp2--;
while (cp2 > cp && *cp2 != '!')
cp2--;
if (*cp2 == '!')
return(cp2 + 1);
return(cp);
}
/*
* Start of a "comment".
* Ignore it.
*/
char *
skip_comment(char *cp)
{
int nesting = 1;
for (; nesting > 0 && *cp; cp++) {
switch (*cp) {
case '\\':
if (cp[1])
cp++;
break;
case '(':
nesting++;
break;
case ')':
nesting--;
break;
}
}
return(cp);
}
/*
* Skin an arpa net address according to the RFC 822 interpretation
* of "host-phrase."
*/
char *
skin(char *name)
{
char *nbuf, *bufend, *cp, *cp2;
int c, gotlt, lastsp;
if (name == NULL)
return(NULL);
if (strchr(name, '(') == NULL && strchr(name, '<') == NULL
&& strchr(name, ' ') == NULL)
return(name);
/* We assume that length(input) <= length(output) */
if ((nbuf = (char *)malloc(strlen(name) + 1)) == NULL)
errx(1, "Out of memory");
gotlt = 0;
lastsp = 0;
bufend = nbuf;
for (cp = name, cp2 = bufend; (c = *cp++) != '\0'; ) {
switch (c) {
case '(':
cp = skip_comment(cp);
lastsp = 0;
break;
case '"':
/*
* Start of a "quoted-string".
* Copy it in its entirety.
*/
while ((c = *cp) != '\0') {
cp++;
if (c == '"')
break;
if (c != '\\')
*cp2++ = c;
else if ((c = *cp) != '\0') {
*cp2++ = c;
cp++;
}
}
lastsp = 0;
break;
case ' ':
if (strncmp(cp, "at ", 3) == 0)
cp += 3, *cp2++ = '@';
else
if (strncmp(cp, "@ ", 2) == 0)
cp += 2, *cp2++ = '@';
else
lastsp = 1;
break;
case '<':
cp2 = bufend;
gotlt++;
lastsp = 0;
break;
case '>':
if (gotlt) {
gotlt = 0;
while ((c = *cp) && c != ',') {
cp++;
if (c == '(')
cp = skip_comment(cp);
else if (c == '"')
while ((c = *cp) != '\0') {
cp++;
if (c == '"')
break;
if (c == '\\' && *cp)
cp++;
}
}
lastsp = 0;
break;
}
/* Fall into . . . */
default:
if (lastsp) {
lastsp = 0;
*cp2++ = ' ';
}
*cp2++ = c;
if (c == ',' && *cp == ' ' && !gotlt) {
*cp2++ = ' ';
while (*++cp == ' ')
;
lastsp = 0;
bufend = cp2;
}
}
}
*cp2 = 0;
if ((cp = (char *)realloc(nbuf, strlen(nbuf) + 1)) != NULL)
nbuf = cp;
return(nbuf);
}
/*
* Fetch the sender's name from the passed message.
* Reptype can be
* 0 -- get sender's name for display purposes
* 1 -- get sender's name for reply
* 2 -- get sender's name for Reply
*/
char *
name1(struct message *mp, int reptype)
{
char namebuf[LINESIZE];
char linebuf[LINESIZE];
char *cp, *cp2;
FILE *ibuf;
int first = 1;
if ((cp = hfield("from", mp)) != NULL)
return(cp);
if (reptype == 0 && (cp = hfield("sender", mp)) != NULL)
return(cp);
ibuf = setinput(mp);
namebuf[0] = '\0';
if (readline(ibuf, linebuf, LINESIZE, NULL) < 0)
return(savestr(namebuf));
newname:
for (cp = linebuf; *cp && *cp != ' '; cp++)
;
for (; *cp == ' ' || *cp == '\t'; cp++)
;
for (cp2 = &namebuf[strlen(namebuf)];
*cp && *cp != ' ' && *cp != '\t' && cp2 < namebuf + LINESIZE - 1;)
*cp2++ = *cp++;
*cp2 = '\0';
if (readline(ibuf, linebuf, LINESIZE, NULL) < 0)
return(savestr(namebuf));
if ((cp = strchr(linebuf, 'F')) == NULL)
return(savestr(namebuf));
if (strncmp(cp, "From", 4) != 0)
return(savestr(namebuf));
while ((cp = strchr(cp, 'r')) != NULL) {
if (strncmp(cp, "remote", 6) == 0) {
if ((cp = strchr(cp, 'f')) == NULL)
break;
if (strncmp(cp, "from", 4) != 0)
break;
if ((cp = strchr(cp, ' ')) == NULL)
break;
cp++;
if (first) {
cp2 = namebuf;
first = 0;
} else
cp2 = strrchr(namebuf, '!') + 1;
strlcpy(cp2, cp, sizeof(namebuf) - (cp2 - namebuf) - 1);
strlcat(namebuf, "!", sizeof(namebuf));
goto newname;
}
cp++;
}
return(savestr(namebuf));
}
/*
* Count the occurances of c in str
*/
int
charcount(char *str, int c)
{
char *cp;
int i;
for (i = 0, cp = str; *cp; cp++)
if (*cp == c)
i++;
return(i);
}
/*
* Copy s1 to s2, return pointer to null in s2.
*/
char *
copy(char *s1, char *s2)
{
while ((*s2++ = *s1++) != '\0')
;
return(s2 - 1);
}
/*
* See if the given header field is supposed to be ignored.
*/
int
isign(char *field, struct ignoretab ignore[2])
{
char realfld[LINESIZE];
if (ignore == ignoreall)
return(1);
/*
* Lower-case the string, so that "Status" and "status"
* will hash to the same place.
*/
istrlcpy(realfld, field, sizeof(realfld));
if (ignore[1].i_count > 0)
return(!member(realfld, ignore + 1));
else
return(member(realfld, ignore));
}
int
member(char *realfield, struct ignoretab *table)
{
struct ignore *igp;
for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link)
if (*igp->i_field == *realfield &&
equal(igp->i_field, realfield))
return(1);
return(0);
}
void
clearnew(void)
{
struct message *mp;
for (mp = &message[0]; mp < &message[msgCount]; mp++) {
if (mp->m_flag & MNEW) {
mp->m_flag &= ~MNEW;
mp->m_flag |= MSTATUS;
}
}
}