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/*
* execute command tree
*/
#include "sh.h"
#include "c_test.h"
#include <ctype.h>
#include "ksh_stat.h"
/* Does ps4 get parameter substitutions done? */
#ifdef KSH
# define PS4_SUBSTITUTE(s) substitute((s), 0)
#else
# define PS4_SUBSTITUTE(s) (s)
#endif /* KSH */
static int comexec ARGS((struct op *t, struct tbl *volatile tp, char **ap,
int volatile flags, volatile int *xerrok));
static void scriptexec ARGS((struct op *tp, char **ap));
static int call_builtin ARGS((struct tbl *tp, char **wp));
static int iosetup ARGS((struct ioword *iop, struct tbl *tp));
static int herein ARGS((const char *content, int sub));
extern int posh_builtin_builtin(int, char **, int);
extern int posh_builtin_command(int, char **, int);
extern int posh_builtin_exec(int, char **, int);
/*
* handle systems that don't have F_SETFD
*/
#ifndef F_SETFD
# ifndef MAXFD
# define MAXFD 64
# endif
/* a bit field would be smaller, but this will work */
static char clexec_tab[MAXFD+1];
#endif
static struct block *blocktemp;
/*
* we now use this function always.
*/
int
fd_clexec(fd)
int fd;
{
#ifndef F_SETFD
if (fd >= 0 && fd < sizeof(clexec_tab)) {
clexec_tab[fd] = 1;
return 0;
}
return -1;
#else
return fcntl(fd, F_SETFD, 1);
#endif
}
/*
* execute command tree
*/
int
execute(struct op * volatile t, volatile int flags, volatile int * volatile xerrok)
{
int i;
volatile int rv = 0, dummy = 0;
int pv[2];
char ** volatile ap;
char *s, *cp;
struct ioword **iowp;
struct tbl *tp = NULL;
if (t == NULL)
return (0);
/* Caller doesn't care if XERROK should propagate. */
if (xerrok == NULL)
xerrok = &dummy;
/* Is this the end of a pipeline? If so, we want to evaluate the
* command arguments
bool_t eval_done = FALSE;
if ((flags&XFORK) && !(flags&XEXEC) && (flags&XPCLOSE)) {
eval_done = TRUE;
tp = eval_execute_args(t, &ap);
}
*/
if ((flags&XFORK) && !(flags&XEXEC) && t->type != TPIPE)
return exchild(t, flags, xerrok, -1); /* run in sub-process */
newenv(E_EXEC);
if (trap)
runtraps(0);
if (t->type == TCOM) {
/* Clear subst_exstat before argument expansion. Used by
* null commands (see comexec() and c_eval()) and by c_set().
*/
subst_exstat = 0;
current_lineno = t->lineno; /* for $LINENO */
/* POSIX says expand command words first, then redirections,
* and assignments last..
*/
ap = eval((const char **)t->args, t->evalflags | DOBLANK | DOGLOB | DOTILDE);
if (Flag(FXTRACE) && ap[0]) {
shf_fprintf(shl_out, "%s",
PS4_SUBSTITUTE(str_val(global("PS4"))));
for (i = 0; ap[i]; i++)
shf_fprintf(shl_out, "%s%c", ap[i],
ap[i + 1] ? ' ' : '\n');
shf_flush(shl_out);
}
if (ap[0])
tp = findcom(ap[0], FC_BI|FC_FUNC);
}
#ifdef SILLY_FEATURES
flags &= ~XTIME;
#endif /* SILLY_FEATURES */
if (t->ioact != NULL || t->type == TPIPE || t->type == TCOPROC) {
e->savefd = (short *) alloc(sizeofN(short, NUFILE), ATEMP);
/* initialize to not redirected */
memset(e->savefd, 0, sizeofN(short, NUFILE));
}
/* do redirection, to be restored in quitenv() */
if (t->ioact != NULL)
for (iowp = t->ioact; *iowp != NULL; iowp++) {
if (iosetup(*iowp, tp) < 0) {
exstat = rv = 1;
/* Redirection failures for special commands
* cause (non-interactive) shell to exit.
*/
if (tp && tp->type == CSHELL
&& (tp->flag & SPEC_BI))
errorf(NULL);
/* Deal with FERREXIT, quitenv(), etc. */
goto Break;
}
}
switch(t->type) {
case TCOM:
rv = comexec(t, tp, ap, flags, xerrok);
break;
case TPAREN:
rv = execute(t->left, flags | XFORK, xerrok);
break;
case TPIPE:
flags |= XFORK;
flags &= ~XEXEC;
e->savefd[0] = savefd(0, 0);
(void) ksh_dup2(e->savefd[0], 0, FALSE); /* stdin of first */
e->savefd[1] = savefd(1, 0);
while (t->type == TPIPE) {
openpipe(pv);
(void) ksh_dup2(pv[1], 1, FALSE); /* stdout of curr */
/* Let exchild() close pv[0] in child
* (if this isn't done, commands like
* (: ; cat /etc/termcap) | sleep 1
* will hang forever).
*/
exchild(t->left, flags | XPIPEO | XCCLOSE,
NULL, pv[0]);
(void) ksh_dup2(pv[0], 0, FALSE); /* stdin of next */
closepipe(pv);
flags |= XPIPEI;
t = t->right;
}
restfd(1, e->savefd[1]); /* stdout of last */
e->savefd[1] = 0; /* no need to re-restore this */
/* Let exchild() close 0 in parent, after fork, before wait */
i = exchild(t, flags | XPCLOSE, xerrok, 0);
if (!(flags&XBGND) && !(flags&XXCOM))
rv = i;
break;
case TLIST:
while (t->type == TLIST) {
execute(t->left, flags & XERROK, NULL);
t = t->right;
}
rv = execute(t, flags & XERROK, xerrok);
break;
case TASYNC:
/* XXX non-optimal, I think - "(foo &)", forks for (),
* forks again for async... parent should optimize
* this to "foo &"...
*/
rv = execute(t->left, (flags&~XEXEC)|XBGND|XFORK, xerrok);
break;
case TOR:
case TAND:
rv = execute(t->left, XERROK, xerrok);
if ((rv == 0) == (t->type == TAND))
rv = execute(t->right, XERROK, xerrok);
flags |= XERROK;
if (xerrok)
*xerrok = 1;
break;
case TBANG:
rv = !execute(t->right, XERROK, xerrok);
flags |= XERROK;
if (xerrok)
*xerrok = 1;
break;
#ifdef KSH
case TDBRACKET:
{
Test_env te;
te.flags = TEF_DBRACKET;
te.pos.wp = t->args;
te.isa = dbteste_isa;
te.getopnd = dbteste_getopnd;
te.eval = dbteste_eval;
te.error = dbteste_error;
rv = test_parse(&te);
break;
}
#endif /* KSH */
case TFOR:
#ifdef KSH
case TSELECT:
{
volatile bool_t is_first = TRUE;
#endif /* KSH */
ap = (t->vars != NULL) ?
eval((const char **)t->vars, DOBLANK|DOGLOB|DOTILDE)
: e->loc->argv + 1;
e->type = E_LOOP;
while (1) {
i = sigsetjmp(e->jbuf, 0);
if (!i)
break;
if ((e->flags&EF_BRKCONT_PASS) ||
(i != LBREAK && i != LCONTIN)) {
quitenv();
unwind(i);
} else if (i == LBREAK) {
rv = 0;
goto Break;
}
}
rv = 0; /* in case of a continue */
if (t->type == TFOR) {
while (*ap != NULL) {
setstr(global(t->str), *ap++, KSH_UNWIND_ERROR);
rv = execute(t->left, flags & XERROK, xerrok);
}
}
#ifdef KSH
else { /* TSELECT */
for (;;) {
if (!(cp = do_selectargs(ap, is_first))) {
rv = 1;
break;
}
is_first = FALSE;
setstr(global(t->str), cp, KSH_UNWIND_ERROR);
rv = execute(t->left, flags & XERROK, xerrok);
}
}
}
#endif /* KSH */
break;
case TWHILE:
case TUNTIL:
e->type = E_LOOP;
while (1) {
i = sigsetjmp(e->jbuf, 0);
if (!i)
break;
if ((e->flags&EF_BRKCONT_PASS) ||
(i != LBREAK && i != LCONTIN)) {
quitenv();
unwind(i);
} else if (i == LBREAK) {
rv = 0;
goto Break;
}
}
rv = 0; /* in case of a continue */
while ((execute(t->left, XERROK, NULL) == 0) ==
(t->type == TWHILE))
rv = execute(t->right, flags & XERROK, xerrok);
break;
case TIF:
case TELIF:
if (t->right == NULL)
break; /* should be error */
rv = execute(t->left, XERROK, NULL) == 0 ?
execute(t->right->left, flags & XERROK, xerrok) :
execute(t->right->right, flags & XERROK, xerrok);
break;
case TCASE:
cp = evalstr(t->str, DOTILDE);
for (t = t->left; t != NULL && t->type == TPAT; t = t->right)
for (ap = t->vars; *ap; ap++)
if ((s = evalstr(*ap, DOTILDE|DOPAT)) &&
gmatchx(cp, s, FALSE))
goto Found;
break;
Found:
rv = execute(t->left, flags & XERROK, xerrok);
break;
case TBRACE:
rv = execute(t->left, flags & XERROK, xerrok);
break;
case TFUNCT:
rv = define(t->str, t);
break;
case TEXEC: /* an eval'd TCOM */
s = t->args[0];
ap = makenv();
restoresigs();
cleanup_proc_env();
/* XINTACT bit is for OS2 */
ksh_execve(t->str, t->args, ap, (flags & XINTACT) ? 1 : 0);
if (errno == ENOEXEC)
scriptexec(t, ap);
else
errorf("%s: %s", s, strerror(errno));
}
Break:
exstat = rv;
quitenv(); /* restores IO */
if ((flags&XEXEC))
unwind(LEXIT); /* exit child */
if (rv != 0 && !(flags & XERROK) &&
(xerrok == NULL || !*xerrok)) {
if (Flag(FERREXIT))
unwind(LERROR);
}
return (rv);
}
/*
* execute simple command
*/
static int
comexec(struct op *t, struct tbl *volatile tp, char **ap, int volatile flags, volatile int *xerrok)
{
int i;
int rv = 0;
char *cp;
static struct op texec; /* Must be static (XXX but why?) */
int type_flags;
int keepasn_ok;
int fcflags = FC_BI|FC_FUNC|FC_PATH;
/* Deal with the shell builtins builtin, exec and command since
* they can be followed by other commands. This must be done before
* we know if we should create a local block, which must be done
* before we can do a path search (in case the assignments change
* PATH).
* Odd cases:
* FOO=bar exec >/dev/null FOO is kept but not exported
* FOO=bar exec foobar FOO is exported
* FOO=bar command exec >/dev/null FOO is neither kept nor exported
* FOO=bar command FOO is neither kept nor exported
* PATH=... foobar use new PATH in foobar search
*/
keepasn_ok = 1;
while (tp && tp->type == CSHELL) {
fcflags = FC_BI|FC_FUNC|FC_PATH;/* undo effects of command */
if (tp->val.f == posh_builtin_builtin) {
if ((cp = *++ap) == NULL) {
tp = NULL;
break;
}
tp = findcom(cp, FC_BI);
if (tp == NULL)
errorf("builtin: %s: not a builtin", cp);
continue;
} else if (tp->val.f == posh_builtin_exec) {
if (ap[1] == NULL)
break;
ap++;
flags |= XEXEC;
} else if (tp->val.f == posh_builtin_command) {
int optc, noargc = 0, saw_p = 0;
char **arg;
/* Ugly dealing with options in two places (here and
* in posh_builtin_command(), but such is life)
*/
arg = ap;
while (*arg++)
++noargc;
/* We need to set optind to 0 or else +p won't work */
optind = 0;
while ((optc = getopt(noargc, ap, "+p")) != -1) {
switch (optc) {
case 'p':
saw_p = 1;
break;
default:
return 1;
}
}
/* don't look for functions */
fcflags = FC_BI|FC_PATH;
if (saw_p) {
fcflags |= FC_DEFPATH;
}
ap += optind;
/* POSIX says special builtins lose their status
* if accessed using command.
*/
keepasn_ok = 0;
if (!ap[0]) {
/* ensure command with no args exits with 0 */
subst_exstat = 0;
break;
}
} else
break;
tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC));
}
if (keepasn_ok && (!ap[0] || (tp && (tp->flag & KEEPASN))))
type_flags = 0;
else {
/* create new variable/function block */
newblock();
type_flags = LOCAL|LOCAL_COPY|EXPORT;
}
if (Flag(FEXPORT))
type_flags |= EXPORT;
for (i = 0; t->vars[i]; i++) {
cp = evalstr(t->vars[i], DOASNTILDE);
if (Flag(FXTRACE)) {
if (i == 0)
shf_fprintf(shl_out, "%s",
PS4_SUBSTITUTE(str_val(global("PS4"))));
shf_fprintf(shl_out, "%s%c", cp,
t->vars[i + 1] ? ' ' : '\n');
if (!t->vars[i + 1])
shf_flush(shl_out);
}
typeset(cp, type_flags, 0, 0, 0);
}
if ((cp = *ap) == NULL) {
rv = subst_exstat;
goto Leave;
} else if (!tp) {
tp = findcom(cp, fcflags);
}
switch (tp->type) {
case CSHELL: /* shell built-in */
rv = call_builtin(tp, ap);
break;
case CFUNC: /* function call */
{
/* volatile int old_xflag; */
volatile Tflag old_inuse;
const char *volatile old_kshname;
if (!(tp->flag & ISSET)) {
struct tbl *ftp;
if (!tp->u.fpath) {
if (tp->u2.errno_) {
warningf(TRUE,
"%s: can't find function definition file - %s",
cp, strerror(tp->u2.errno_));
rv = 126;
} else {
warningf(TRUE,
"%s: can't find function definition file", cp);
rv = 127;
}
break;
}
if (include(tp->u.fpath, 0, NULL, 0) < 0) {
warningf(TRUE,
"%s: can't open function definition file %s - %s",
cp, tp->u.fpath, strerror(errno));
rv = 127;
break;
}
if (!(ftp = findfunc(cp, FALSE))
|| !(ftp->flag & ISSET))
{
warningf(TRUE,
"%s: function not defined by %s",
cp, tp->u.fpath);
rv = 127;
break;
}
tp = ftp;
}
/* ksh functions set $0 to function name, POSIX functions leave
* $0 unchanged.
*/
old_kshname = poshname;
ap[0] = (char *) poshname;
e->loc->argv = ap;
for (i = 0; *ap++ != NULL; i++)
;
e->loc->argc = i - 1;
/* ksh-style functions handle getopts sanely,
* bourne/posix functions are insane...
*/
/* old_xflag = Flag(FXTRACE);
Flag(FXTRACE) = tp->flag & TRACE ? TRUE : FALSE; */
old_inuse = tp->flag & FINUSE;
tp->flag |= FINUSE;
e->type = E_FUNC;
i = sigsetjmp(e->jbuf, 0);
if (i == 0) {
/* seems odd to pass XERROK here, but AT&T ksh does */
exstat = execute(tp->val.t, flags & XERROK, xerrok);
i = LRETURN;
}
poshname = old_kshname;
/* Flag(FXTRACE) = old_xflag; */
tp->flag = (tp->flag & ~FINUSE) | old_inuse;
/* Were we deleted while executing? If so, free the execution
* tree. todo: Unfortunately, the table entry is never re-used
* until the lookup table is expanded.
*/
if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) {
if (tp->flag & ALLOC) {
tp->flag &= ~ALLOC;
tfree(tp->val.t, tp->areap);
}
tp->flag = 0;
}
switch (i) {
case LRETURN:
case LERROR:
rv = exstat;
break;
case LINTR:
case LEXIT:
case LLEAVE:
case LSHELL:
quitenv();
unwind(i);
/*NOTREACHED*/
default:
quitenv();
internal_errorf(1, "CFUNC %d", i);
}
break;
}
case CEXEC: /* executable command */
case CTALIAS: /* tracked alias */
if (!(tp->flag&ISSET)) {
/* errno_ will be set if the named command was found
* but could not be executed (permissions, no execute
* bit, directory, etc). Print out a (hopefully)
* useful error message and set the exit status to 126.
*/
if (tp->u2.errno_) {
warningf(TRUE, "%s: cannot execute - %s", cp,
strerror(tp->u2.errno_));
rv = 126; /* POSIX */
} else {
warningf(TRUE, "%s: not found", cp);
rv = 127;
}
break;
}
#ifdef KSH
/* set $_ to program's full path */
/* setstr() can't fail here */
setstr(typeset("_", LOCAL|EXPORT, 0, INTEGER, 0),
tp->val.s, KSH_RETURN_ERROR);
#endif /* KSH */
if (flags&XEXEC) {
j_exit();
if (!(flags&XBGND)) {
setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG);
setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG);
}
}
/* to fork we set up a TEXEC node and call execute */
texec.type = TEXEC;
texec.left = t; /* for tprint */
texec.str = tp->val.s;
texec.args = ap;
rv = exchild(&texec, flags, xerrok, -1);
break;
}
Leave:
if (flags & XEXEC) {
exstat = rv;
unwind(LLEAVE);
}
return (rv);
}
static void
scriptexec(struct op *tp, char **ap)
{
char *shell;
shell = str_val(global(EXECSHELL_STR));
if (shell && *shell)
shell = search(shell, path, X_OK, (int *) 0);
if (!shell || !*shell)
shell = EXECSHELL;
*tp->args-- = tp->str;
#ifdef SHARPBANG
{
char buf[LINE];
register char *cp;
register int fd, n;
buf[0] = '\0';
if ((fd = open(tp->str, O_RDONLY)) >= 0) {
if ((n = read(fd, buf, LINE - 1)) > 0)
buf[n] = '\0';
(void) close(fd);
}
if ((buf[0] == '#' && buf[1] == '!' && (cp = &buf[2]))
)
{
while (*cp && (*cp == ' ' || *cp == '\t'))
cp++;
if (*cp && *cp != '\n') {
char *a0 = cp, *a1 = (char *) 0;
while (*cp && *cp != '\n' && *cp != ' '
&& *cp != '\t')
{
cp++;
}
if (*cp && *cp != '\n') {
*cp++ = '\0';
while (*cp
&& (*cp == ' ' || *cp == '\t'))
cp++;
if (*cp && *cp != '\n') {
a1 = cp;
/* all one argument */
while (*cp && *cp != '\n')
cp++;
}
}
if (*cp == '\n') {
*cp = '\0';
if (a1)
*tp->args-- = a1;
shell = a0;
}
}
}
}
#endif /* SHARPBANG */
*tp->args = shell;
ksh_execve(tp->args[0], tp->args, ap, 0);
/* report both the program that was run and the bogus shell */
errorf("%s: %s: %s", tp->str, shell, strerror(errno));
}
int
shcomexec(char **wp)
{
struct tbl *tp;
tp = transitional_tsearch(&builtins.root, *wp);
if (tp == NULL)
internal_errorf(1, "shcomexec: %s", *wp);
return call_builtin(tp, wp);
}
/*
* Search function tables for a function. If create set, a table entry
* is created if none is found.
*/
struct tbl *
findfunc(const char *name, int create)
{
struct block *l;
struct tbl *tp = (struct tbl *) 0;
for (l = e->loc; l; l = l->next) {
tp = transitional_tsearch(&l->funs.root, name);
if (tp)
break;
if (!l->next && create) {
tp = transitional_tenter(&l->funs.root, name, APERM);
tp->flag = DEFINED;
tp->type = CFUNC;
tp->val.t = (struct op *) 0;
break;
}
}
blocktemp = l;
return tp;
}
/*
* define function. Returns 1 if function is being undefined (t == 0) and
* function did not exist, returns 0 otherwise.
*/
int
define(const char *name, struct op *t)
{
struct tbl *tp;
int was_set = 0;
while (1) {
tp = findfunc(name, TRUE);
if (tp->flag & ISSET)
was_set = 1;
/* If this function is currently being executed, we zap this
* table entry so findfunc() won't see it
*/
if (tp->flag & FINUSE) {
tp->name[0] = '\0';
tp->flag &= ~DEFINED; /* ensure it won't be found */
tp->flag |= FDELETE;
} else
break;
}
if (tp->flag & ALLOC) {
tp->flag &= ~(ISSET|ALLOC);
tfree(tp->val.t, tp->areap);
}
if (t == NULL) { /* undefine */
transitional_tdelete(&blocktemp->vars.root, tp);
return was_set ? 0 : 1;
}
tp->val.t = tcopy(t->left, tp->areap);
tp->flag |= (ISSET|ALLOC);
return (0);
}
/*
* add builtin
*/
void
builtin(const char *name, int (*func) (int, char **, int), int flags)
{
struct tbl *tp;
/* see if any flags should be set for this builtin */
tp = transitional_tenter(&builtins.root, name, APERM);
tp->flag = DEFINED | flags;
tp->type = CSHELL;
tp->val.f = func;
}
/*
* find command
* either function, hashed command, or built-in (in that order)
*/
struct tbl *
findcom(const char *name, int flags)
{
static struct tbl temp;
struct tbl *tp = NULL, *tbi;
char *fpath; /* for function autoloading */
char *npath;
if (ksh_strchr_dirsep(name) != NULL) {
/* prevent FPATH search below */
flags &= ~FC_FUNC;
goto Search;
}
tbi = (flags & FC_BI) ? transitional_tsearch(&builtins.root, name) : NULL;
/* POSIX says special builtins first, then functions, then
* POSIX regular builtins, then search path...
*/
if ((flags & FC_SPECBI) && tbi && (tbi->flag & SPEC_BI))
tp = tbi;
if (!tp && (flags & FC_FUNC)) {
tp = findfunc(name, FALSE);
if (tp && !(tp->flag & ISSET)) {
if ((fpath = str_val(global("FPATH"))) == null) {
tp->u.fpath = NULL;
tp->u2.errno_ = 0;
} else
tp->u.fpath = search(name, fpath, R_OK,
&tp->u2.errno_);
}
}
if (!tp && (flags & FC_REGBI) && tbi && (tbi->flag & REG_BI))
tp = tbi;
/* todo: posix says non-special/non-regular builtins must
* be triggered by some user-controllable means like a
* special directory in PATH. Requires modifications to
* the search() function. Tracked aliases should be
* modified to allow tracking of builtin commands.
* This should be under control of the FPOSIX flag.
* If this is changed, also change c_whence...
*/
if (!tp && (flags & FC_UNREGBI) && tbi)
tp = tbi;
Search:
if ((!tp || (tp->type == CTALIAS && !(tp->flag&ISSET))) &&
(flags & FC_PATH)) {
if (!tp) {
tp = &temp;
tp->type = CEXEC;
tp->flag = DEFINED; /* make ~ISSET */
}
npath = search(name, flags & FC_DEFPATH ? def_path : path,
X_OK, &tp->u2.errno_);
if (npath) {
tp->val.s = tp == &temp ? npath : str_save(npath, APERM);
tp->flag |= ISSET|ALLOC;
} else if ((flags & FC_FUNC)
&& (fpath = str_val(global("FPATH"))) != null
&& (npath = search(name, fpath, R_OK,
&tp->u2.errno_)) != (char *) 0)
{
/* An undocumented feature of at&t ksh is that it
* searches FPATH if a command is not found, even
* if the command hasn't been set up as an autoloaded
* function (ie, no typeset -uf).
*/
tp = &temp;
tp->type = CFUNC;
tp->flag = DEFINED; /* make ~ISSET */
tp->u.fpath = npath;
}
}
return (tp);
}
/* Check if path is something we want to find. Returns -1 for failure. */
int
search_access(path, mode, errnop)
const char *path;
int mode;
int *errnop; /* set if candidate found, but not suitable */
{
int ret, err = 0;
struct stat statb;
if (stat(path, &statb) < 0)
return -1;
ret = eaccess(path, mode);
if (ret < 0)
err = errno; /* File exists, but we can't access it */
else if (mode == X_OK
&& (!S_ISREG(statb.st_mode)
/* This 'cause access() says root can execute everything */
|| !(statb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH))))
{
ret = -1;
err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES;
}
if (err && errnop && !*errnop)
*errnop = err;
return (ret);
}
/*
* search for command with PATH
*/
char *
search(name, path, mode, errnop)
const char *name;
const char *path;
int mode; /* R_OK or X_OK */
int *errnop; /* set if candidate found, but not suitable */
{
const char *sp, *p;
char *xp;
XString xs;
int namelen;
if (errnop)
*errnop = 0;
if (ksh_strchr_dirsep(name)) {
if (search_access(name, mode, errnop) == 0)
return (char *)(name);
return (NULL);
}
namelen = strlen(name) + 1;
Xinit(xs, xp, 128, ATEMP);
sp = path;
while (sp != NULL) {
xp = Xstring(xs, xp);
if (!(p = strchr(sp, PATHSEP)))
p = sp + strlen(sp);
if (p != sp) {
XcheckN(xs, xp, p - sp);
memcpy(xp, sp, p - sp);
xp += p - sp;
*xp++ = DIRSEP;
}
sp = p;
XcheckN(xs, xp, namelen);
memcpy(xp, name, namelen);
if (search_access(Xstring(xs, xp), mode, errnop) == 0)
return Xclose(xs, xp + namelen);
if (*sp++ == '\0')
sp = NULL;
}
Xfree(xs, xp);
return (NULL);
}
static int
call_builtin(struct tbl *tp, char **wp)
{
int rv, noargc;
char **arg;
builtin_argv0 = wp[0];
builtin_flag = tp->flag;
shf_reopen(1, SHF_WR, shl_stdout);
shl_stdout_ok = 1;
optind = 1;
noargc = 0;
arg = wp;
while(*arg++)
++noargc;
rv = (*tp->val.f)(noargc, wp, builtin_flag);
shf_flush(shl_stdout);
shl_stdout_ok = 0;
builtin_flag = 0;
builtin_argv0 = NULL;
return (rv);
}
/*
* set up redirection, saving old fd's in e->savefd
*/
static int
iosetup(struct ioword *iop, struct tbl UNUSED(*tp))
{
int u = -1;
char *cp = iop->name;
int iotype = iop->flag & IOTYPE;
int do_open = 1, do_close = 0, flags = 0;
struct ioword iotmp;
struct stat statb;
if (iotype != IOHERE)
cp = evalonestr(cp, DOTILDE|(Flag(FTALKING_I) ? DOGLOB : 0));
/* Used for tracing and error messages to print expanded cp */
iotmp = *iop;
iotmp.name = (iotype == IOHERE) ? NULL : cp;
iotmp.flag |= IONAMEXP;
if (Flag(FXTRACE))
shellf("%s%s\n",
PS4_SUBSTITUTE(str_val(global("PS4"))),
snptreef((char *) 0, 32, "%R", &iotmp));
switch (iotype) {
case IOREAD:
flags = O_RDONLY;
break;
case IOCAT:
flags = O_WRONLY | O_APPEND | O_CREAT;
break;
case IOWRITE:
flags = O_WRONLY | O_CREAT | O_TRUNC;
/* The stat() is here to allow redirections to
* things like /dev/null without error.
*/
if (Flag(FNOCLOBBER) && !(iop->flag & IOCLOB) &&
(stat(cp, &statb) < 0 || S_ISREG(statb.st_mode)))
flags |= O_EXCL;
break;
case IORDWR:
flags = O_RDWR | O_CREAT;
break;
case IOHERE:
do_open = 0;
/* herein() returns -2 if error has been printed */
u = herein(iop->heredoc, iop->flag & IOEVAL);
/* cp may have wrong name */
break;
case IODUP: {
const char *emsg;
do_open = 0;
if (*cp == '-' && !cp[1]) {
u = 1009; /* prevent error return below */
do_close = 1;
} else if ((u = check_fd(cp,
X_OK | ((iop->flag & IORDUP) ? R_OK : W_OK),
&emsg)) < 0) {
warningf(TRUE, "%s: %s",
snptreef(NULL, 32, "%R", &iotmp), emsg);
return (-1);
}
if (u == iop->unit)
return (0); /* "dup from" == "dup to" */
break;
}
}
if (do_open) {
u = open(cp, flags, 0666);
}
if (u < 0) {
/* herein() may already have printed message */
if (u == -1) {
u = errno;
warningf(TRUE, "cannot %s %s: %s",
iotype == IODUP ? "dup" :
(iotype == IOREAD || iotype == IOHERE) ?
"open" : "create", cp, strerror(u));
}
return (-1);
}
/* Do not save if it has already been redirected (i.e. "cat >x >y"). */
if (e->savefd[iop->unit] == 0) {
/* If these are the same, it means unit was previously closed */
if (u == iop->unit)
e->savefd[iop->unit] = -1;
else
/* c_exec() assumes e->savefd[fd] set for any
* redirections. Ask savefd() not to close iop->unit;
* this allows error messages to be seen if iop->unit
* is 2; also means we can't lose the fd (eg, both
* dup2 below and dup2 in restfd() failing).
*/
e->savefd[iop->unit] = savefd(iop->unit, 1);
}
if (do_close)
close(iop->unit);
else if (u != iop->unit) {
if (ksh_dup2(u, iop->unit, TRUE) < 0) {
int ev;
ev = errno;
warningf(TRUE,
"could not finish (dup) redirection %s: %s",
snptreef(NULL, 32, "%R", &iotmp),
strerror(ev));
if (iotype != IODUP)
close(u);
return (-1);
}
if (iotype != IODUP)
close(u);
#ifdef KSH
/* Touching any co-process fd in an empty exec
* causes the shell to close its copies
*/
else if (tp && tp->type == CSHELL && tp->val.f == posh_builtin_exec) {
if (iop->flag & IORDUP) /* possible exec <&p */
coproc_read_close(u);
else /* possible exec >&p */
coproc_write_close(u);
}
#endif /* KSH */
}
if (u == 2) /* Clear any write errors */
shf_reopen(2, SHF_WR, shl_out);
return (0);
}
/*
* open here document temp file.
* if unquoted here, expand here temp file into second temp file.
*/
static int
herein(const char *content, int sub)
{
volatile int fd = -1;
struct source *s, *volatile osource;
struct shf *volatile shf;
struct temp *h;
int i;
/* ksh -c 'cat << EOF' can cause this... */
if (content == NULL) {
warningf(TRUE, "here document missing");
return (-2); /* special to iosetup(): don't print error */
}
/* Create temp file to hold content (done before newenv so temp
* doesn't get removed too soon).
*/
h = maketemp(ATEMP, TT_HEREDOC_EXP, &e->temps);
if (!(shf = h->shf) || (fd = open(h->name, O_RDONLY, 0)) < 0) {
warningf(TRUE, "can't %s temporary file %s: %s",
!shf ? "create" : "open",
h->name, strerror(errno));
if (shf)
shf_close(shf);
return (-2) /* special to iosetup(): don't print error */;
}
osource = source;
newenv(E_ERRH);
i = sigsetjmp(e->jbuf, 0);
if (i) {
source = osource;
quitenv();
shf_close(shf); /* after quitenv */
close(fd);
return (-2); /* special to iosetup(): don't print error */
}
if (sub) {
/* Do substitutions on the content of heredoc */
s = pushs(SSTRING, ATEMP);
s->start = s->str = content;
source = s;
if (yylex(ONEWORD|HEREDOC) != LWORD)
internal_errorf(1, "herein: yylex");
source = osource;
shf_puts(evalstr(yylval.cp, 0), shf);
} else
shf_puts(content, shf);
quitenv();
if (shf_close(shf) == EOF) {
close(fd);
warningf(TRUE, "error writing %s: %s", h->name,
strerror(errno));
return (-2); /* special to iosetup(): don't print error */
}
return (fd);
}
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