NetBSD-5.0.2/usr.bin/mail/support.c
/* $NetBSD: support.c,v 1.21 2008/04/24 01:27:07 christos 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)aux.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: support.c,v 1.21 2008/04/24 01:27:07 christos Exp $");
#endif
#endif /* not lint */
#include <stdarg.h>
#include <util.h>
#include "rcv.h"
#include "extern.h"
#include "mime.h"
#include "thread.h"
/*
* Mail -- a mail program
*
* Auxiliary functions.
*/
/*
* Return a pointer to a dynamic copy of the argument.
*/
PUBLIC char *
savestr(const char *str)
{
char *new;
size_t size = strlen(str) + 1;
if ((new = salloc(size)) != NULL)
(void)memmove(new, str, size);
return new;
}
/*
* Make a copy of new argument incorporating old one.
*/
static char *
save2str(char *str, char *old)
{
char *new;
size_t newsize = strlen(str) + 1;
size_t oldsize = old ? strlen(old) + 1 : 0;
if ((new = salloc(newsize + oldsize)) != NULL) {
if (oldsize) {
(void)memmove(new, old, oldsize);
new[oldsize - 1] = ' ';
}
(void)memmove(new + oldsize, str, newsize);
}
return new;
}
/*
* Like asprintf(), but with result salloc-ed rather than malloc-ed.
*/
PUBLIC int
sasprintf(char **ret, const char *format, ...)
{
int rval;
char *p;
va_list args;
va_start(args, format);
rval = evasprintf(&p, format, args);
*ret = savestr(p);
free(p);
va_end(args);
return rval;
}
struct set_m_flag_args_s {
int and_bits;
int xor_bits;
};
static int
set_m_flag_core(struct message *mp, void *v)
{
struct set_m_flag_args_s *args;
args = v;
mp->m_flag &= args->and_bits;
mp->m_flag ^= args->xor_bits;
return 0;
}
PUBLIC struct message *
set_m_flag(int msgnum, int and_bits, int xor_bits)
{
struct message *mp;
struct set_m_flag_args_s args;
mp = get_message(msgnum);
args.and_bits = and_bits;
args.xor_bits = xor_bits;
(void)thread_recursion(mp, set_m_flag_core, &args);
return mp;
}
/*
* 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.
*/
PUBLIC 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.
*/
PUBLIC int
isdir(const 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.
*/
PUBLIC int
argcount(char **argv)
{
char **ap;
for (ap = argv; *ap++ != NULL; /*EMPTY*/)
continue;
return ap - argv - 1;
}
/*
* Check whether the passed line is a header line of
* the desired breed. Return the field body, or NULL.
*/
static char*
ishfield(const char linebuf[], char *colon, const char field[])
{
char *cp = colon;
*cp = 0;
if (strcasecmp(linebuf, field) != 0) {
*cp = ':';
return NULL;
}
*cp = ':';
for (cp++; is_WSP(*cp); cp++)
continue;
return cp;
}
/*
* 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.
*
* WARNING - do not call this outside hfield() or decoding will not
* get done.
*/
static 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 = mail_readline(f, linebuf, LINESIZE)) <= 0)
return -1;
for (cp = linebuf;
isprint((unsigned char)*cp) && *cp != ' ' && *cp != ':';
cp++)
continue;
if (*cp != ':' || cp == linebuf)
continue;
/*
* I guess we got a headline.
* Handle wraparounding
*/
*colon = cp;
cp = linebuf + c;
for (;;) {
while (--cp >= linebuf && is_WSP(*cp))
continue;
cp++;
if (rem <= 0)
break;
(void)ungetc(c = getc(f), f);
if (!is_WSP(c))
break;
if ((c = mail_readline(f, line2, LINESIZE)) < 0)
break;
rem--;
cp2 = skip_WSP(line2);
c -= cp2 - line2;
if (cp + c >= linebuf + LINESIZE - 2)
break;
*cp++ = ' ';
(void)memmove(cp, cp2, (size_t)c);
cp += c;
}
*cp = 0;
return rem;
}
/* NOTREACHED */
}
/*
* Return the desired header line from the passed message
* pointer (or NULL if the desired header field is not available).
*/
PUBLIC char *
hfield(const char field[], const struct message *mp)
{
FILE *ibuf;
char linebuf[LINESIZE];
int lc;
char *headerfield;
char *colon, *oldhfield = NULL;
#ifdef MIME_SUPPORT
int decode;
decode = value(ENAME_MIME_DECODE_MSG) &&
value(ENAME_MIME_DECODE_HDR);
#endif
ibuf = setinput(mp);
if ((lc = mp->m_lines - 1) < 0)
return NULL;
if (mail_readline(ibuf, linebuf, LINESIZE) < 0)
return NULL;
while (lc > 0) {
if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
return oldhfield;
#ifdef MIME_SUPPORT
if ((headerfield = ishfield(linebuf, colon, field)) != NULL) {
char linebuf2[LINESIZE];
if (decode)
headerfield = mime_decode_hfield(linebuf2,
sizeof(linebuf2), linebuf, headerfield);
oldhfield = save2str(headerfield, oldhfield);
}
#else
if ((headerfield = ishfield(linebuf, colon, field)) != NULL)
oldhfield = save2str(headerfield, oldhfield);
#endif
}
return oldhfield;
}
/*
* Copy a string, lowercasing it as we go.
*/
PUBLIC void
istrcpy(char *dest, const char *src)
{
do {
*dest++ = tolower((unsigned char)*src);
} while (*src++ != 0);
}
/*
* 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 */
static struct sstack {
FILE *s_file; /* File we were in. */
int s_cond; /* Saved state of conditionals */
#ifdef NEW_CONDITIONAL
struct cond_stack_s *s_cond_stack; /* Saved conditional stack */
#endif
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).
*/
PUBLIC int
source(void *v)
{
char **arglist = v;
FILE *fi;
const char *cp;
if ((cp = expand(*arglist)) == NULL)
return 1;
if ((fi = Fopen(cp, "r")) == NULL) {
warn("%s", cp);
return 1;
}
if (ssp >= NOFILE - 1) {
(void)printf("Too much \"sourcing\" going on.\n");
(void)Fclose(fi);
return 1;
}
sstack[ssp].s_file = input;
sstack[ssp].s_cond = cond;
#ifdef NEW_CONDITIONAL
sstack[ssp].s_cond_stack = cond_stack;
#endif
sstack[ssp].s_loading = loading;
ssp++;
loading = 0;
cond = CNONE;
input = fi;
sourcing++;
return 0;
}
/*
* Pop the current input back to the previous level.
* Update the "sourcing" flag as appropriate.
*/
PUBLIC int
unstack(void)
{
if (ssp <= 0) {
(void)printf("\"Source\" stack over-pop.\n");
sourcing = 0;
return 1;
}
(void)Fclose(input);
if (cond != CNONE || cond_stack != NULL)
(void)printf("Unmatched \"if\"\n");
ssp--;
input = sstack[ssp].s_file;
cond = sstack[ssp].s_cond;
#ifdef NEW_CONDITIONAL
cond_stack = sstack[ssp].s_cond_stack;
#endif
loading = sstack[ssp].s_loading;
if (ssp == 0)
sourcing = loading;
return 0;
}
/*
* Touch the indicated file.
* This is nifty for the shell.
*/
PUBLIC void
alter(char *name)
{
struct stat sb;
struct timeval tv[2];
if (stat(name, &sb))
return;
(void)gettimeofday(&tv[0], NULL);
tv[0].tv_sec++;
TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
(void)utimes(name, tv);
}
/*
* Examine the passed line buffer and
* return true if it is all blanks and tabs.
*/
PUBLIC int
blankline(char linebuf[])
{
char *cp;
for (cp = linebuf; *cp; cp++)
if (!is_WSP(*cp))
return 0;
return 1;
}
/*
* Start of a "comment".
* Ignore it.
*/
static char *
skip_comment(char *cp)
{
int nesting = 1;
for (/*EMPTY*/; 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."
*/
PUBLIC char *
skin(char *name)
{
int c;
char *cp, *cp2;
char *bufend;
int gotlt, lastsp;
char nbuf[LINESIZE];
if (name == NULL)
return NULL;
if (strchr(name, '(') == NULL && strchr(name, '<') == NULL
&& strchr(name, ' ') == NULL)
return name;
gotlt = 0;
lastsp = 0;
bufend = nbuf;
for (cp = name, cp2 = bufend; (c = *cp++) != '\0'; /*EMPTY*/) {
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 (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
cp += 3, *cp2++ = '@';
else
if (cp[0] == '@' && cp[1] == ' ')
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;
}
/* FALLTHROUGH */
default:
if (lastsp) {
lastsp = 0;
*cp2++ = ' ';
}
*cp2++ = c;
if (c == ',' && !gotlt) {
*cp2++ = ' ';
for (/*EMPTY*/; *cp == ' '; cp++)
continue;
lastsp = 0;
bufend = cp2;
}
}
}
*cp2 = 0;
return savestr(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
*/
static char *
name1(struct message *mp, int reptype)
{
char namebuf[LINESIZE];
char linebuf[LINESIZE];
char *cp, *cp2;
FILE *ibuf;
int firstrun = 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 (mail_readline(ibuf, linebuf, LINESIZE) < 0)
return savestr(namebuf);
newname:
for (cp = linebuf; *cp && *cp != ' '; cp++)
continue;
cp = skip_WSP(cp);
for (cp2 = &namebuf[strlen(namebuf)];
*cp && !is_WSP(*cp) && cp2 < namebuf + LINESIZE - 1;
/*EMPTY*/)
*cp2++ = *cp++;
*cp2 = '\0';
if (mail_readline(ibuf, linebuf, LINESIZE) < 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 (firstrun) {
cp2 = namebuf;
firstrun = 0;
} else
cp2 = strrchr(namebuf, '!') + 1;
while (*cp && cp2 < namebuf + LINESIZE - 1)
*cp2++ = *cp++;
if (cp2 < namebuf + LINESIZE - 1)
*cp2++ = '!';
*cp2 = '\0';
if (cp2 < namebuf + LINESIZE - 1)
goto newname;
else
break;
}
cp++;
}
return savestr(namebuf);
}
/*
* Count the occurrences of c in str
*/
static int
charcount(char *str, int c)
{
char *cp;
int i;
for (i = 0, cp = str; *cp; cp++)
if (*cp == c)
i++;
return i;
}
/*
* 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.
*/
PUBLIC 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;
}
/*
* Copy s1 to s2, return pointer to null in s2.
*/
PUBLIC char *
copy(char *s1, char *s2)
{
while ((*s2++ = *s1++) != '\0')
continue;
return s2 - 1;
}
/*
* The core routine to check the ignore table for a field.
* Note: realfield should be lower-cased!
*/
PUBLIC 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;
}
/*
* See if the given header field is supposed to be ignored.
*/
PUBLIC int
isign(const char *field, struct ignoretab ignoretabs[2])
{
char realfld[LINESIZE];
if (ignoretabs == ignoreall)
return 1;
/*
* Lower-case the string, so that "Status" and "status"
* will hash to the same place.
*/
istrcpy(realfld, field);
if (ignoretabs[1].i_count > 0)
return !member(realfld, ignoretabs + 1);
else
return member(realfld, ignoretabs);
}
PUBLIC void
add_ignore(const char *name, struct ignoretab *tab)
{
char field[LINESIZE];
int h;
struct ignore *igp;
istrcpy(field, name);
if (member(field, tab))
return;
h = hash(field);
igp = ecalloc(1, sizeof(struct ignore));
igp->i_field = ecalloc(strlen(field) + 1, sizeof(char));
(void)strcpy(igp->i_field, field);
igp->i_link = tab->i_head[h];
tab->i_head[h] = igp;
tab->i_count++;
}
/*
* Write a file to stdout, skipping comment lines.
*/
PUBLIC void
cathelp(const char *fname)
{
char *line;
FILE *f;
size_t len;
if ((f = Fopen(fname, "r")) == NULL) {
warn(fname);
return;
}
while ((line = fgetln(f, &len)) != NULL) {
if (*line == '#')
continue;
if (fwrite(line, 1, len, stdout) != len)
break;
}
(void)Fclose(f);
return;
}