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/*
* sh.misc.c: Miscelaneous functions
*/
/*-
* Copyright (c) 1980, 1991 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 "sh.h"
static int renum (int, int);
static Char **blkend (Char **);
static Char **blkcat (Char **, Char **);
static int xdup2 (int, int);
/*
* C Shell
*/
int
any(const char *s, Char c)
{
if (!s)
return (0); /* Check for nil pointer */
while (*s)
if ((Char)*s++ == c)
return (1);
return (0);
}
void
setzero(void *p, size_t size)
{
memset(p, 0, size);
}
#ifndef SHORT_STRINGS
char *
strnsave(const char *s, size_t len)
{
char *r;
r = xmalloc(len + 1);
memcpy(r, s, len);
r[len] = '\0';
return r;
}
#endif
char *
strsave(const char *s)
{
char *r;
size_t size;
if (s == NULL)
s = "";
size = strlen(s) + 1;
r = xmalloc(size);
memcpy(r, s, size);
return (r);
}
static Char **
blkend(Char **up)
{
while (*up)
up++;
return (up);
}
void
blkpr(Char *const *av)
{
for (; *av; av++) {
xprintf("%S", *av);
if (av[1])
xprintf(" ");
}
}
Char *
blkexpand(Char *const *av)
{
struct Strbuf buf = Strbuf_INIT;
for (; *av; av++) {
Strbuf_append(&buf, *av);
if (av[1])
Strbuf_append1(&buf, ' ');
}
return Strbuf_finish(&buf);
}
int
blklen(Char **av)
{
int i = 0;
while (*av++)
i++;
return (i);
}
Char **
blkcpy(Char **oav, Char **bv)
{
Char **av = oav;
while ((*av++ = *bv++) != NULL)
continue;
return (oav);
}
static Char **
blkcat(Char **up, Char **vp)
{
(void) blkcpy(blkend(up), vp);
return (up);
}
void
blkfree(Char **av0)
{
Char **av = av0;
if (!av0)
return;
for (; *av; av++)
xfree(*av);
xfree(av0);
}
void
blk_cleanup(void *ptr)
{
blkfree(ptr);
}
void
blk_indirect_cleanup(void *xptr)
{
Char ***ptr;
ptr = xptr;
blkfree(*ptr);
xfree(ptr);
}
Char **
saveblk(Char **v)
{
Char **newv, **onewv;
if (v == NULL)
return NULL;
onewv = newv = xcalloc(blklen(v) + 1, sizeof(Char **));
while (*v)
*newv++ = Strsave(*v++);
return (onewv);
}
#ifndef HAVE_STRSTR
char *
strstr(const char *s, const char *t)
{
do {
const char *ss = s;
const char *tt = t;
do
if (*tt == '\0')
return (s);
while (*ss++ == *tt++);
} while (*s++ != '\0');
return (NULL);
}
#endif /* !HAVE_STRSTR */
char *
strspl(const char *cp, const char *dp)
{
char *ep;
size_t cl, dl;
if (!cp)
cp = "";
if (!dp)
dp = "";
cl = strlen(cp);
dl = strlen(dp);
ep = xmalloc((cl + dl + 1) * sizeof(char));
memcpy(ep, cp, cl);
memcpy(ep + cl, dp, dl + 1);
return (ep);
}
Char **
blkspl(Char **up, Char **vp)
{
Char **wp = xcalloc(blklen(up) + blklen(vp) + 1, sizeof(Char **));
(void) blkcpy(wp, up);
return (blkcat(wp, vp));
}
Char
lastchr(Char *cp)
{
if (!cp)
return (0);
if (!*cp)
return (0);
while (cp[1])
cp++;
return (*cp);
}
/*
* This routine is called after an error to close up
* any units which may have been left open accidentally.
*/
void
closem(void)
{
int f, num_files;
#ifdef S_ISSOCK
struct stat st;
#endif /*S_ISSOCK*/
#ifdef NLS_BUGS
#ifdef NLS_CATALOGS
nlsclose();
#endif /* NLS_CATALOGS */
#endif /* NLS_BUGS */
#ifdef YPBUGS
/* suggested by Justin Bur; thanks to Karl Kleinpaste */
fix_yp_bugs();
#endif /* YPBUGS */
num_files = NOFILE;
for (f = 0; f < num_files; f++)
if (f != SHIN && f != SHOUT && f != SHDIAG && f != OLDSTD &&
f != FSHTTY
#ifdef MALLOC_TRACE
&& f != 25
#endif /* MALLOC_TRACE */
#ifdef S_ISSOCK
/* NSS modules (e.g. Linux nss_ldap) might keep sockets open.
* If we close such a socket, both the NSS module and tcsh think
* they "own" the descriptor.
*
* Not closing sockets does not make the cleanup use of closem()
* less reliable because tcsh never creates sockets.
*/
&& fstat(f, &st) == 0 && !S_ISSOCK(st.st_mode)
#endif
)
{
xclose(f);
#ifdef NISPLUS
if(f < 3)
(void) xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
#endif /* NISPLUS */
}
#ifdef NLS_BUGS
#ifdef NLS_CATALOGS
nlsinit();
#endif /* NLS_CATALOGS */
#endif /* NLS_BUGS */
}
#ifndef CLOSE_ON_EXEC
/*
* Close files before executing a file.
* We could be MUCH more intelligent, since (on a version 7 system)
* we need only close files here during a source, the other
* shell fd's being in units 16-19 which are closed automatically!
*/
void
closech(void)
{
int f, num_files;
if (didcch)
return;
didcch = 1;
SHIN = 0;
SHOUT = 1;
SHDIAG = 2;
OLDSTD = 0;
isoutatty = isatty(SHOUT);
isdiagatty = isatty(SHDIAG);
num_files = NOFILE;
for (f = 3; f < num_files; f++)
xclose(f);
}
#endif /* CLOSE_ON_EXEC */
void
donefds(void)
{
xclose(0);
xclose(1);
xclose(2);
didfds = 0;
#ifdef NISPLUS
{
int fd = xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
(void)dcopy(fd, 1);
(void)dcopy(fd, 2);
(void)dmove(fd, 0);
}
#endif /*NISPLUS*/
}
/*
* Move descriptor i to j.
* If j is -1 then we just want to get i to a safe place,
* i.e. to a unit > FSAFE. This also happens in dcopy.
*/
int
dmove(int i, int j)
{
if (i == j || i < 0)
return (i);
#ifdef HAVE_DUP2
if (j >= 0) {
(void) xdup2(i, j);
if (j != i)
xclose(i);
return (j);
}
#endif
j = dcopy(i, j);
if (j != i)
xclose(i);
return (j);
}
int
dcopy(int i, int j)
{
if (i == j || i < 0 || (j < 0 && i > FSAFE))
return (i);
if (j >= 0) {
#ifdef HAVE_DUP2
(void) xdup2(i, j);
return (j);
#else
xclose(j);
#endif
}
return (renum(i, j));
}
static int
renum(int i, int j)
{
int k = dup(i);
if (k < 0)
return (-1);
if (j == -1 && k > FSAFE)
return (k);
if (k != j) {
j = renum(k, j);
xclose(k);
return (j);
}
return (k);
}
/*
* Left shift a command argument list, discarding
* the first c arguments. Used in "shift" commands
* as well as by commands like "repeat".
*/
void
lshift(Char **v, int c)
{
Char **u;
for (u = v; *u && --c >= 0; u++)
xfree(*u);
(void) blkcpy(v, u);
}
int
number(Char *cp)
{
if (!cp)
return (0);
if (*cp == '-') {
cp++;
if (!Isdigit(*cp))
return (0);
cp++;
}
while (*cp && Isdigit(*cp))
cp++;
return (*cp == 0);
}
Char **
copyblk(Char **v)
{
Char **nv = xcalloc(blklen(v) + 1, sizeof(Char **));
return (blkcpy(nv, v));
}
char *
strend(const char *cp)
{
if (!cp)
return ((char *)(intptr_t)cp);
while (*cp)
cp++;
return ((char *)(intptr_t)cp);
}
Char *
strip(Char *cp)
{
Char *dp = cp;
if (!cp)
return (cp);
while (*dp != '\0') {
#if INVALID_BYTE != 0
if ((*dp & INVALID_BYTE) != INVALID_BYTE) /* *dp < INVALID_BYTE */
#endif
*dp &= TRIM;
dp++;
}
return (cp);
}
Char *
quote(Char *cp)
{
Char *dp = cp;
if (!cp)
return (cp);
while (*dp != '\0') {
#ifdef WIDE_STRINGS
if ((*dp & 0xffffff80) == 0) /* *dp < 0x80 */
#elif defined SHORT_STRINGS
if ((*dp & 0xff80) == 0) /* *dp < 0x80 */
#else
if ((*dp & 0x80) == 0) /* *dp < 0x80 */
#endif
*dp |= QUOTE;
dp++;
}
return (cp);
}
const Char *
quote_meta(struct Strbuf *buf, const Char *s)
{
buf->len = 0;
while (*s != '\0') {
if (cmap(*s, _META | _DOL | _QF | _QB | _ESC | _GLOB))
Strbuf_append1(buf, '\\');
Strbuf_append1(buf, *s++);
}
Strbuf_terminate(buf);
return buf->s;
}
void
udvar(Char *name)
{
setname(short2str(name));
stderror(ERR_NAME | ERR_UNDVAR);
}
int
prefix(const Char *sub, const Char *str)
{
for (;;) {
if (*sub == 0)
return (1);
if (*str == 0)
return (0);
if ((*sub++ & TRIM) != (*str++ & TRIM))
return (0);
}
}
#ifndef WINNT_NATIVE
char *
areadlink(const char *path)
{
char *buf;
size_t size;
ssize_t res;
size = MAXPATHLEN + 1;
buf = xmalloc(size);
while ((size_t)(res = readlink(path, buf, size)) == size) {
size *= 2;
buf = xrealloc(buf, size);
}
if (res == -1) {
int err;
err = errno;
xfree(buf);
errno = err;
return NULL;
}
buf[res] = '\0';
return xrealloc(buf, res + 1);
}
#endif /*!WINNT_NATIVE*/
void
xclose(int fildes)
{
if (fildes < 0)
return;
while (close(fildes) == -1 && errno == EINTR)
if (handle_pending_signals())
break;
}
void
xclosedir(DIR *dirp)
{
while (closedir(dirp) == -1 && errno == EINTR)
if (handle_pending_signals())
break;
}
int
xcreat(const char *path, mode_t mode)
{
int res;
while ((res = creat(path, mode)) == -1 && errno == EINTR)
if (handle_pending_signals())
break;
return res;
}
#ifdef HAVE_DUP2
static int
xdup2(int fildes, int fildes2)
{
int res;
while ((res = dup2(fildes, fildes2)) == -1 && errno == EINTR)
if (handle_pending_signals())
break;
return res;
}
#endif
struct group *
xgetgrgid(gid_t xgid)
{
struct group *res;
errno = 0;
while ((res = getgrgid(xgid)) == NULL && errno == EINTR) {
if (handle_pending_signals())
break;
errno = 0;
}
return res;
}
struct passwd *
xgetpwnam(const char *name)
{
struct passwd *res;
errno = 0;
while ((res = getpwnam(name)) == NULL && errno == EINTR) {
if (handle_pending_signals())
break;
errno = 0;
}
return res;
}
struct passwd *
xgetpwuid(uid_t xuid)
{
struct passwd *res;
errno = 0;
while ((res = getpwuid(xuid)) == NULL && errno == EINTR) {
if (handle_pending_signals())
break;
errno = 0;
}
return res;
}
int
xopen(const char *path, int oflag, ...)
{
int res;
if ((oflag & O_CREAT) == 0) {
while ((res = open(path, oflag)) == -1 && errno == EINTR)
if (handle_pending_signals())
break;
} else {
va_list ap;
mode_t mode;
va_start(ap, oflag);
/* "int" should actually be "mode_t after default argument
promotions". "int" is the best guess we have, "mode_t" used to be
"unsigned short", which we obviously can't use. */
mode = va_arg(ap, int);
va_end(ap);
while ((res = open(path, oflag, mode)) == -1 && errno == EINTR)
if (handle_pending_signals())
break;
}
return res;
}
ssize_t
xread(int fildes, void *buf, size_t nbyte)
{
ssize_t res = -1;
/* This is where we will be blocked most of the time, so handle signals
that didn't interrupt any system call. */
do
if (handle_pending_signals())
break;
while ((res = read(fildes, buf, nbyte)) == -1 && errno == EINTR);
return res;
}
#ifdef POSIX
int
xtcsetattr(int fildes, int optional_actions, const struct termios *termios_p)
{
int res;
while ((res = tcsetattr(fildes, optional_actions, termios_p)) == -1 &&
errno == EINTR)
if (handle_pending_signals())
break;
return res;
}
#endif
ssize_t
xwrite(int fildes, const void *buf, size_t nbyte)
{
ssize_t res = -1;
/* This is where we will be blocked most of the time, so handle signals
that didn't interrupt any system call. */
do
if (handle_pending_signals())
break;
while ((res = write(fildes, buf, nbyte)) == -1 && errno == EINTR);
return res;
}
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