JehanneOS
/
mksh
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
mksh/misc.c

2199 lines
47 KiB
C
Raw Blame History

/* $OpenBSD: misc.c,v 1.37 2009/04/19 20:34:05 sthen Exp $ */
/* $OpenBSD: path.c,v 1.12 2005/03/30 17:16:37 deraadt Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
* 2011, 2012
* Thorsten Glaser <tg@mirbsd.org>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
* is granted to deal in this work without restriction, including un-
* limited rights to use, publicly perform, distribute, sell, modify,
* merge, give away, or sublicence.
*
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
* the utmost extent permitted by applicable law, neither express nor
* implied; without malicious intent or gross negligence. In no event
* may a licensor, author or contributor be held liable for indirect,
* direct, other damage, loss, or other issues arising in any way out
* of dealing in the work, even if advised of the possibility of such
* damage or existence of a defect, except proven that it results out
* of said person's immediate fault when using the work as intended.
*/
#include "sh.h"
#if !HAVE_GETRUSAGE
#include <sys/times.h>
#endif
#if HAVE_GRP_H
#include <grp.h>
#endif
__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.200 2012/10/22 20:52:47 tg Exp $");
#define KSH_CHVT_FLAG
#ifdef MKSH_SMALL
#undef KSH_CHVT_FLAG
#endif
#ifdef TIOCSCTTY
#define KSH_CHVT_CODE
#define KSH_CHVT_FLAG
#endif
#ifdef MKSH_LEGACY_MODE
#undef KSH_CHVT_CODE
#undef KSH_CHVT_FLAG
#endif
/* type bits for unsigned char */
unsigned char chtypes[UCHAR_MAX + 1];
static const unsigned char *pat_scan(const unsigned char *,
const unsigned char *, bool);
static int do_gmatch(const unsigned char *, const unsigned char *,
const unsigned char *, const unsigned char *);
static const unsigned char *cclass(const unsigned char *, int);
#ifdef KSH_CHVT_CODE
static void chvt(const char *);
#endif
/*XXX this should go away */
static int make_path(const char *, const char *, char **, XString *, int *);
#ifdef SETUID_CAN_FAIL_WITH_EAGAIN
/* we don't need to check for other codes, EPERM won't happen */
#define DO_SETUID(func, argvec) do { \
if ((func argvec) && errno == EAGAIN) \
errorf("%s failed with EAGAIN, probably due to a" \
" too low process limit; aborting", #func); \
} while (/* CONSTCOND */ 0)
#else
#define DO_SETUID(func, argvec) func argvec
#endif
/*
* Fast character classes
*/
void
setctypes(const char *s, int t)
{
unsigned int i;
if (t & C_IFS) {
for (i = 0; i < UCHAR_MAX + 1; i++)
chtypes[i] &= ~C_IFS;
/* include \0 in C_IFS */
chtypes[0] |= C_IFS;
}
while (*s != 0)
chtypes[(unsigned char)*s++] |= t;
}
void
initctypes(void)
{
int c;
for (c = 'a'; c <= 'z'; c++)
chtypes[c] |= C_ALPHA;
for (c = 'A'; c <= 'Z'; c++)
chtypes[c] |= C_ALPHA;
chtypes['_'] |= C_ALPHA;
setctypes("0123456789", C_DIGIT);
/* \0 added automatically */
setctypes(TC_LEX1, C_LEX1);
setctypes("*@#!$-?", C_VAR1);
setctypes(TC_IFSWS, C_IFSWS);
setctypes("=-+?", C_SUBOP1);
setctypes("\t\n \"#$&'()*;<=>?[\\]`|", C_QUOTE);
}
/* called from XcheckN() to grow buffer */
char *
Xcheck_grow(XString *xsp, const char *xp, size_t more)
{
const char *old_beg = xsp->beg;
if (more < xsp->len)
more = xsp->len;
/* (xsp->len + X_EXTRA) never overflows */
checkoktoadd(more, xsp->len + X_EXTRA);
xsp->beg = aresize(xsp->beg, (xsp->len += more) + X_EXTRA, xsp->areap);
xsp->end = xsp->beg + xsp->len;
return (xsp->beg + (xp - old_beg));
}
#define SHFLAGS_DEFNS
#include "sh_flags.h"
const struct shoption options[] = {
#define SHFLAGS_ITEMS
#include "sh_flags.h"
};
/*
* translate -o option into F* constant (also used for test -o option)
*/
size_t
option(const char *n)
{
size_t i;
if ((n[0] == '-' || n[0] == '+') && n[1] && !n[2]) {
for (i = 0; i < NELEM(options); i++)
if (options[i].c == n[1])
return (i);
} else for (i = 0; i < NELEM(options); i++)
if (options[i].name && strcmp(options[i].name, n) == 0)
return (i);
return ((size_t)-1);
}
struct options_info {
int opt_width;
int opts[NELEM(options)];
};
static char *options_fmt_entry(char *, size_t, unsigned int, const void *);
static void printoptions(bool);
/* format a single select menu item */
static char *
options_fmt_entry(char *buf, size_t buflen, unsigned int i, const void *arg)
{
const struct options_info *oi = (const struct options_info *)arg;
shf_snprintf(buf, buflen, "%-*s %s",
oi->opt_width, options[oi->opts[i]].name,
Flag(oi->opts[i]) ? "on" : "off");
return (buf);
}
static void
printoptions(bool verbose)
{
size_t i = 0;
if (verbose) {
size_t n = 0, len, octs = 0;
struct options_info oi;
/* verbose version */
shf_puts("Current option settings\n", shl_stdout);
oi.opt_width = 0;
while (i < NELEM(options)) {
if (options[i].name) {
oi.opts[n++] = i;
len = strlen(options[i].name);
if (len > octs)
octs = len;
len = utf_mbswidth(options[i].name);
if ((int)len > oi.opt_width)
oi.opt_width = (int)len;
}
++i;
}
print_columns(shl_stdout, n, options_fmt_entry, &oi,
octs + 4, oi.opt_width + 4, true);
} else {
/* short version like AT&T ksh93 */
shf_puts(Tset, shl_stdout);
while (i < (int)NELEM(options)) {
if (Flag(i) && options[i].name)
shprintf("%s %s %s", null, "-o",
options[i].name);
++i;
}
shf_putc('\n', shl_stdout);
}
}
char *
getoptions(void)
{
size_t i;
char m[(int)FNFLAGS + 1];
char *cp = m;
for (i = 0; i < NELEM(options); i++)
if (options[i].c && Flag(i))
*cp++ = options[i].c;
strndupx(cp, m, cp - m, ATEMP);
return (cp);
}
/* change a Flag(*) value; takes care of special actions */
void
change_flag(enum sh_flag f, int what, unsigned int newval)
{
unsigned char oldval;
oldval = Flag(f);
/* needed for tristates */
Flag(f) = newval ? 1 : 0;
#ifndef MKSH_UNEMPLOYED
if (f == FMONITOR) {
if (what != OF_CMDLINE && newval != oldval)
j_change();
} else
#endif
#ifndef MKSH_NO_CMDLINE_EDITING
if ((
#if !MKSH_S_NOVI
f == FVI ||
#endif
f == FEMACS || f == FGMACS) && newval) {
#if !MKSH_S_NOVI
Flag(FVI) =
#endif
Flag(FEMACS) = Flag(FGMACS) = 0;
Flag(f) = (unsigned char)newval;
} else
#endif
if (f == FPRIVILEGED && oldval && !newval) {
/* Turning off -p? */
/*XXX this can probably be optimised */
kshegid = kshgid = getgid();
#if HAVE_SETRESUGID
DO_SETUID(setresgid, (kshegid, kshegid, kshegid));
#if HAVE_SETGROUPS
/* setgroups doesn't EAGAIN on Linux */
setgroups(1, &kshegid);
#endif
DO_SETUID(setresuid, (ksheuid, ksheuid, ksheuid));
#else
/* seteuid, setegid, setgid don't EAGAIN on Linux */
ksheuid = kshuid = getuid();
#ifndef MKSH__NO_SETEUGID
seteuid(ksheuid);
#endif
DO_SETUID(setuid, (ksheuid));
#ifndef MKSH__NO_SETEUGID
setegid(kshegid);
#endif
setgid(kshegid);
#endif
} else if ((f == FPOSIX || f == FSH) && newval) {
Flag(FPOSIX) = Flag(FSH) = Flag(FBRACEEXPAND) = 0;
Flag(f) = (unsigned char)newval;
}
/* Changing interactive flag? */
if (f == FTALKING) {
if ((what == OF_CMDLINE || what == OF_SET) && procpid == kshpid)
Flag(FTALKING_I) = (unsigned char)newval;
}
}
/*
* Parse command line and set command arguments. Returns the index of
* non-option arguments, -1 if there is an error.
*/
int
parse_args(const char **argv,
/* OF_CMDLINE or OF_SET */
int what,
bool *setargsp)
{
static char cmd_opts[NELEM(options) + 5]; /* o:T:\0 */
static char set_opts[NELEM(options) + 6]; /* A:o;s\0 */
char set, *opts;
const char *array = NULL;
Getopt go;
size_t i;
int optc, arrayset = 0;
bool sortargs = false;
/* First call? Build option strings... */
if (cmd_opts[0] == '\0') {
char *p = cmd_opts, *q = set_opts;
/* see cmd_opts[] declaration */
*p++ = 'o';
*p++ = ':';
#ifdef KSH_CHVT_FLAG
*p++ = 'T';
*p++ = ':';
#endif
/* see set_opts[] declaration */
*q++ = 'A';
*q++ = ':';
*q++ = 'o';
*q++ = ';';
*q++ = 's';
for (i = 0; i < NELEM(options); i++) {
if (options[i].c) {
if (options[i].flags & OF_CMDLINE)
*p++ = options[i].c;
if (options[i].flags & OF_SET)
*q++ = options[i].c;
}
}
*p = '\0';
*q = '\0';
}
if (what == OF_CMDLINE) {
const char *p = argv[0], *q;
/*
* Set FLOGIN before parsing options so user can clear
* flag using +l.
*/
if (*p != '-')
for (q = p; *q; )
if (*q++ == '/')
p = q;
Flag(FLOGIN) = (*p == '-');
opts = cmd_opts;
} else if (what == OF_FIRSTTIME) {
opts = cmd_opts;
} else
opts = set_opts;
ksh_getopt_reset(&go, GF_ERROR|GF_PLUSOPT);
while ((optc = ksh_getopt(argv, &go, opts)) != -1) {
set = (go.info & GI_PLUS) ? 0 : 1;
switch (optc) {
case 'A':
if (what == OF_FIRSTTIME)
break;
arrayset = set ? 1 : -1;
array = go.optarg;
break;
case 'o':
if (what == OF_FIRSTTIME)
break;
if (go.optarg == NULL) {
/*
* lone -o: print options
*
* Note that on the command line, -o requires
* an option (ie, can't get here if what is
* OF_CMDLINE).
*/
printoptions(set);
break;
}
i = option(go.optarg);
if ((i != (size_t)-1) && set == Flag(i))
/*
* Don't check the context if the flag
* isn't changing - makes "set -o interactive"
* work if you're already interactive. Needed
* if the output of "set +o" is to be used.
*/
;
else if ((i != (size_t)-1) && (options[i].flags & what))
change_flag((enum sh_flag)i, what, set);
else {
bi_errorf("%s: %s", go.optarg, "bad option");
return (-1);
}
break;
#ifdef KSH_CHVT_FLAG
case 'T':
if (what != OF_FIRSTTIME)
break;
#ifndef KSH_CHVT_CODE
errorf("no TIOCSCTTY ioctl");
#else
change_flag(FTALKING, OF_CMDLINE, 1);
chvt(go.optarg);
break;
#endif
#endif
case '?':
return (-1);
default:
if (what == OF_FIRSTTIME)
break;
/* -s: sort positional params (AT&T ksh stupidity) */
if (what == OF_SET && optc == 's') {
sortargs = true;
break;
}
for (i = 0; i < NELEM(options); i++)
if (optc == options[i].c &&
(what & options[i].flags)) {
change_flag((enum sh_flag)i, what, set);
break;
}
if (i == NELEM(options))
internal_errorf("parse_args: '%c'", optc);
}
}
if (!(go.info & GI_MINUSMINUS) && argv[go.optind] &&
(argv[go.optind][0] == '-' || argv[go.optind][0] == '+') &&
argv[go.optind][1] == '\0') {
/* lone - clears -v and -x flags */
if (argv[go.optind][0] == '-')
Flag(FVERBOSE) = Flag(FXTRACE) = 0;
/* set skips lone - or + option */
go.optind++;
}
if (setargsp)
/* -- means set $#/$* even if there are no arguments */
*setargsp = !arrayset && ((go.info & GI_MINUSMINUS) ||
argv[go.optind]);
if (arrayset) {
const char *ccp = NULL;
if (*array)
ccp = skip_varname(array, false);
if (!ccp || !(!ccp[0] || (ccp[0] == '+' && !ccp[1]))) {
bi_errorf("%s: %s", array, "is not an identifier");
return (-1);
}
}
if (sortargs) {
for (i = go.optind; argv[i]; i++)
;
qsort(&argv[go.optind], i - go.optind, sizeof(void *),
xstrcmp);
}
if (arrayset)
go.optind += set_array(array, tobool(arrayset > 0),
argv + go.optind);
return (go.optind);
}
/* parse a decimal number: returns 0 if string isn't a number, 1 otherwise */
int
getn(const char *s, int *ai)
{
int c;
unsigned int i, j, k;
bool neg = false;
int rv = 0;
do {
c = *s++;
} while (ksh_isspace(c));
if (c == '-') {
neg = true;
c = *s++;
} else if (c == '+')
c = *s++;
k = neg ? 2147483648U : 2147483647U;
j = i = 0;
do {
if (!ksh_isdigit(c))
goto getn_out;
if ((j = i * 10 + c - '0') > k)
goto getn_out;
i = j;
} while ((c = *s++));
rv = 1;
getn_out:
*ai = i == 2147483648U ? (int)i : neg ? -(int)i : (int)i;
return (rv);
}
/**
* pattern simplifications:
* - @(x) -> x (not @(x|y) though)
* - ** -> *
*/
static void *
simplify_gmatch_pattern(const unsigned char *sp)
{
uint8_t c;
unsigned char *cp, *dp;
const unsigned char *ps, *se;
cp = alloc(strlen((const void *)sp) + 1, ATEMP);
goto simplify_gmatch_pat1a;
/* foo@(b@(a)r)b@(a|a)z -> foobarb@(a|a)z */
simplify_gmatch_pat1:
sp = cp;
simplify_gmatch_pat1a:
dp = cp;
se = sp + strlen((const void *)sp);
while ((c = *sp++)) {
if (!ISMAGIC(c)) {
*dp++ = c;
continue;
}
switch ((c = *sp++)) {
case 0x80|'@':
/* simile for @ */
case 0x80|' ':
/* check whether it has only one clause */
ps = pat_scan(sp, se, true);
if (!ps || ps[-1] != /*(*/ ')')
/* nope */
break;
/* copy inner clause until matching close */
ps -= 2;
while ((const unsigned char *)sp < ps)
*dp++ = *sp++;
/* skip MAGIC and closing parenthesis */
sp += 2;
/* copy the rest of the pattern */
memmove(dp, sp, strlen((const void *)sp) + 1);
/* redo from start */
goto simplify_gmatch_pat1;
}
*dp++ = MAGIC;
*dp++ = c;
}
*dp = '\0';
/* collapse adjacent asterisk wildcards */
sp = dp = cp;
while ((c = *sp++)) {
if (!ISMAGIC(c)) {
*dp++ = c;
continue;
}
switch ((c = *sp++)) {
case '*':
while (ISMAGIC(sp[0]) && sp[1] == c)
sp += 2;
break;
}
*dp++ = MAGIC;
*dp++ = c;
}
*dp = '\0';
/* return the result, allocated from ATEMP */
return (cp);
}
/* -------- gmatch.c -------- */
/*
* int gmatch(string, pattern)
* char *string, *pattern;
*
* Match a pattern as in sh(1).
* pattern character are prefixed with MAGIC by expand.
*/
int
gmatchx(const char *s, const char *p, bool isfile)
{
const char *se, *pe;
char *pnew;
int rv;
if (s == NULL || p == NULL)
return (0);
se = s + strlen(s);
pe = p + strlen(p);
/*
* isfile is false iff no syntax check has been done on
* the pattern. If check fails, just to a strcmp().
*/
if (!isfile && !has_globbing(p, pe)) {
size_t len = pe - p + 1;
char tbuf[64];
char *t = len <= sizeof(tbuf) ? tbuf : alloc(len, ATEMP);
debunk(t, p, len);
return (!strcmp(t, s));
}
/*
* since the do_gmatch() engine sucks so much, we must do some
* pattern simplifications
*/
pnew = simplify_gmatch_pattern((const unsigned char *)p);
pe = pnew + strlen(pnew);
rv = do_gmatch((const unsigned char *)s, (const unsigned char *)se,
(const unsigned char *)pnew, (const unsigned char *)pe);
afree(pnew, ATEMP);
return (rv);
}
/**
* Returns if p is a syntacticly correct globbing pattern, false
* if it contains no pattern characters or if there is a syntax error.
* Syntax errors are:
* - [ with no closing ]
* - imbalanced $(...) expression
* - [...] and *(...) not nested (eg, [a$(b|]c), *(a[b|c]d))
*/
/*XXX
* - if no magic,
* if dest given, copy to dst
* return ?
* - if magic && (no globbing || syntax error)
* debunk to dst
* return ?
* - return ?
*/
int
has_globbing(const char *xp, const char *xpe)
{
const unsigned char *p = (const unsigned char *) xp;
const unsigned char *pe = (const unsigned char *) xpe;
int c;
int nest = 0, bnest = 0;
bool saw_glob = false;
/* inside [...] */
bool in_bracket = false;
for (; p < pe; p++) {
if (!ISMAGIC(*p))
continue;
if ((c = *++p) == '*' || c == '?')
saw_glob = true;
else if (c == '[') {
if (!in_bracket) {
saw_glob = true;
in_bracket = true;
if (ISMAGIC(p[1]) && p[2] == '!')
p += 2;
if (ISMAGIC(p[1]) && p[2] == ']')
p += 2;
}
/*XXX Do we need to check ranges here? POSIX Q */
} else if (c == ']') {
if (in_bracket) {
if (bnest)
/* [a*(b]) */
return (0);
in_bracket = false;
}
} else if ((c & 0x80) && vstrchr("*+?@! ", c & 0x7f)) {
saw_glob = true;
if (in_bracket)
bnest++;
else
nest++;
} else if (c == '|') {
if (in_bracket && !bnest)
/* *(a[foo|bar]) */
return (0);
} else if (c == /*(*/ ')') {
if (in_bracket) {
if (!bnest--)
/* *(a[b)c] */
return (0);
} else if (nest)
nest--;
}
/*
* else must be a MAGIC-MAGIC, or MAGIC-!,
* MAGIC--, MAGIC-], MAGIC-{, MAGIC-, MAGIC-}
*/
}
return (saw_glob && !in_bracket && !nest);
}
/* Function must return either 0 or 1 (assumed by code for 0x80|'!') */
static int
do_gmatch(const unsigned char *s, const unsigned char *se,
const unsigned char *p, const unsigned char *pe)
{
int sc, pc;
const unsigned char *prest, *psub, *pnext;
const unsigned char *srest;
if (s == NULL || p == NULL)
return (0);
while (p < pe) {
pc = *p++;
sc = s < se ? *s : '\0';
s++;
if (!ISMAGIC(pc)) {
if (sc != pc)
return (0);
continue;
}
switch (*p++) {
case '[':
if (sc == 0 || (p = cclass(p, sc)) == NULL)
return (0);
break;
case '?':
if (sc == 0)
return (0);
if (UTFMODE) {
--s;
s += utf_ptradj((const void *)s);
}
break;
case '*':
if (p == pe)
return (1);
s--;
do {
if (do_gmatch(s, se, p, pe))
return (1);
} while (s++ < se);
return (0);
/**
* [*+?@!](pattern|pattern|..)
* This is also needed for ${..%..}, etc.
*/
/* matches one or more times */
case 0x80|'+':
/* matches zero or more times */
case 0x80|'*':
if (!(prest = pat_scan(p, pe, false)))
return (0);
s--;
/* take care of zero matches */
if (p[-1] == (0x80 | '*') &&
do_gmatch(s, se, prest, pe))
return (1);
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, true);
for (srest = s; srest <= se; srest++) {
if (do_gmatch(s, srest, psub, pnext - 2) &&
(do_gmatch(srest, se, prest, pe) ||
(s != srest && do_gmatch(srest,
se, p - 2, pe))))
return (1);
}
if (pnext == prest)
break;
}
return (0);
/* matches zero or once */
case 0x80|'?':
/* matches one of the patterns */
case 0x80|'@':
/* simile for @ */
case 0x80|' ':
if (!(prest = pat_scan(p, pe, false)))
return (0);
s--;
/* Take care of zero matches */
if (p[-1] == (0x80 | '?') &&
do_gmatch(s, se, prest, pe))
return (1);
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, true);
srest = prest == pe ? se : s;
for (; srest <= se; srest++) {
if (do_gmatch(s, srest, psub, pnext - 2) &&
do_gmatch(srest, se, prest, pe))
return (1);
}
if (pnext == prest)
break;
}
return (0);
/* matches none of the patterns */
case 0x80|'!':
if (!(prest = pat_scan(p, pe, false)))
return (0);
s--;
for (srest = s; srest <= se; srest++) {
int matched = 0;
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, true);
if (do_gmatch(s, srest, psub,
pnext - 2)) {
matched = 1;
break;
}
if (pnext == prest)
break;
}
if (!matched &&
do_gmatch(srest, se, prest, pe))
return (1);
}
return (0);
default:
if (sc != p[-1])
return (0);
break;
}
}
return (s == se);
}
static const unsigned char *
cclass(const unsigned char *p, int sub)
{
int c, d, notp, found = 0;
const unsigned char *orig_p = p;
if ((notp = (ISMAGIC(*p) && *++p == '!')))
p++;
do {
c = *p++;
if (ISMAGIC(c)) {
c = *p++;
if ((c & 0x80) && !ISMAGIC(c)) {
/* extended pattern matching: *+?@! */
c &= 0x7F;
/* XXX the ( char isn't handled as part of [] */
if (c == ' ')
/* simile for @: plain (..) */
c = '(' /*)*/;
}
}
if (c == '\0')
/* No closing ] - act as if the opening [ was quoted */
return (sub == '[' ? orig_p : NULL);
if (ISMAGIC(p[0]) && p[1] == '-' &&
(!ISMAGIC(p[2]) || p[3] != ']')) {
/* MAGIC- */
p += 2;
d = *p++;
if (ISMAGIC(d)) {
d = *p++;
if ((d & 0x80) && !ISMAGIC(d))
d &= 0x7f;
}
/* POSIX says this is an invalid expression */
if (c > d)
return (NULL);
} else
d = c;
if (c == sub || (c <= sub && sub <= d))
found = 1;
} while (!(ISMAGIC(p[0]) && p[1] == ']'));
return ((found != notp) ? p+2 : NULL);
}
/* Look for next ) or | (if match_sep) in *(foo|bar) pattern */
static const unsigned char *
pat_scan(const unsigned char *p, const unsigned char *pe, bool match_sep)
{
int nest = 0;
for (; p < pe; p++) {
if (!ISMAGIC(*p))
continue;
if ((*++p == /*(*/ ')' && nest-- == 0) ||
(*p == '|' && match_sep && nest == 0))
return (p + 1);
if ((*p & 0x80) && vstrchr("*+?@! ", *p & 0x7f))
nest++;
}
return (NULL);
}
int
xstrcmp(const void *p1, const void *p2)
{
return (strcmp(*(const char * const *)p1, *(const char * const *)p2));
}
/* Initialise a Getopt structure */
void
ksh_getopt_reset(Getopt *go, int flags)
{
go->optind = 1;
go->optarg = NULL;
go->p = 0;
go->flags = flags;
go->info = 0;
go->buf[1] = '\0';
}
/**
* getopt() used for shell built-in commands, the getopts command, and
* command line options.
* A leading ':' in options means don't print errors, instead return '?'
* or ':' and set go->optarg to the offending option character.
* If GF_ERROR is set (and option doesn't start with :), errors result in
* a call to bi_errorf().
*
* Non-standard features:
* - ';' is like ':' in options, except the argument is optional
* (if it isn't present, optarg is set to 0).
* Used for 'set -o'.
* - ',' is like ':' in options, except the argument always immediately
* follows the option character (optarg is set to the null string if
* the option is missing).
* Used for 'read -u2', 'print -u2' and fc -40.
* - '#' is like ':' in options, expect that the argument is optional
* and must start with a digit. If the argument doesn't start with a
* digit, it is assumed to be missing and normal option processing
* continues (optarg is set to 0 if the option is missing).
* Used for 'typeset -LZ4'.
* - accepts +c as well as -c IF the GF_PLUSOPT flag is present. If an
* option starting with + is accepted, the GI_PLUS flag will be set
* in go->info.
*/
int
ksh_getopt(const char **argv, Getopt *go, const char *optionsp)
{
char c;
const char *o;
if (go->p == 0 || (c = argv[go->optind - 1][go->p]) == '\0') {
const char *arg = argv[go->optind], flag = arg ? *arg : '\0';
go->p = 1;
if (flag == '-' && arg[1] == '-' && arg[2] == '\0') {
go->optind++;
go->p = 0;
go->info |= GI_MINUSMINUS;
return (-1);
}
if (arg == NULL ||
((flag != '-' ) &&
/* neither a - nor a + (if + allowed) */
(!(go->flags & GF_PLUSOPT) || flag != '+')) ||
(c = arg[1]) == '\0') {
go->p = 0;
return (-1);
}
go->optind++;
go->info &= ~(GI_MINUS|GI_PLUS);
go->info |= flag == '-' ? GI_MINUS : GI_PLUS;
}
go->p++;
if (c == '?' || c == ':' || c == ';' || c == ',' || c == '#' ||
!(o = cstrchr(optionsp, c))) {
if (optionsp[0] == ':') {
go->buf[0] = c;
go->optarg = go->buf;
} else {
warningf(true, "%s%s-%c: %s",
(go->flags & GF_NONAME) ? "" : argv[0],
(go->flags & GF_NONAME) ? "" : ": ", c,
"unknown option");
if (go->flags & GF_ERROR)
bi_errorfz();
}
return ('?');
}
/**
* : means argument must be present, may be part of option argument
* or the next argument
* ; same as : but argument may be missing
* , means argument is part of option argument, and may be null.
*/
if (*++o == ':' || *o == ';') {
if (argv[go->optind - 1][go->p])
go->optarg = argv[go->optind - 1] + go->p;
else if (argv[go->optind])
go->optarg = argv[go->optind++];
else if (*o == ';')
go->optarg = NULL;
else {
if (optionsp[0] == ':') {
go->buf[0] = c;
go->optarg = go->buf;
return (':');
}
warningf(true, "%s%s-%c: %s",
(go->flags & GF_NONAME) ? "" : argv[0],
(go->flags & GF_NONAME) ? "" : ": ", c,
"requires an argument");
if (go->flags & GF_ERROR)
bi_errorfz();
return ('?');
}
go->p = 0;
} else if (*o == ',') {
/* argument is attached to option character, even if null */
go->optarg = argv[go->optind - 1] + go->p;
go->p = 0;
} else if (*o == '#') {
/*
* argument is optional and may be attached or unattached
* but must start with a digit. optarg is set to 0 if the
* argument is missing.
*/
if (argv[go->optind - 1][go->p]) {
if (ksh_isdigit(argv[go->optind - 1][go->p])) {
go->optarg = argv[go->optind - 1] + go->p;
go->p = 0;
} else
go->optarg = NULL;
} else {
if (argv[go->optind] && ksh_isdigit(argv[go->optind][0])) {
go->optarg = argv[go->optind++];
go->p = 0;
} else
go->optarg = NULL;
}
}
return (c);
}
/*
* print variable/alias value using necessary quotes
* (POSIX says they should be suitable for re-entry...)
* No trailing newline is printed.
*/
void
print_value_quoted(struct shf *shf, const char *s)
{
unsigned char c;
const unsigned char *p = (const unsigned char *)s;
bool inquote = true;
/* first, check whether any quotes are needed */
while ((c = *p++) >= 32)
if (ctype(c, C_QUOTE))
inquote = false;
p = (const unsigned char *)s;
if (c == 0) {
if (inquote) {
/* nope, use the shortcut */
shf_puts(s, shf);
return;
}
/* otherwise, quote nicely via state machine */
while ((c = *p++) != 0) {
if (c == '\'') {
/*
* multiple single quotes or any of them
* at the beginning of a string look nicer
* this way than when simply substituting
*/
if (inquote) {
shf_putc('\'', shf);
inquote = false;
}
shf_putc('\\', shf);
} else if (!inquote) {
shf_putc('\'', shf);
inquote = true;
}
shf_putc(c, shf);
}
} else {
unsigned int wc;
size_t n;
/* use $'...' quote format */
shf_putc('$', shf);
shf_putc('\'', shf);
while ((c = *p) != 0) {
if (c >= 0xC2) {
n = utf_mbtowc(&wc, (const char *)p);
if (n != (size_t)-1) {
p += n;
shf_fprintf(shf, "\\u%04X", wc);
continue;
}
}
++p;
switch (c) {
/* see unbksl() in this file for comments */
case 7:
c = 'a';
if (0)
/* FALLTHROUGH */
case '\b':
c = 'b';
if (0)
/* FALLTHROUGH */
case '\f':
c = 'f';
if (0)
/* FALLTHROUGH */
case '\n':
c = 'n';
if (0)
/* FALLTHROUGH */
case '\r':
c = 'r';
if (0)
/* FALLTHROUGH */
case '\t':
c = 't';
if (0)
/* FALLTHROUGH */
case 11:
c = 'v';
if (0)
/* FALLTHROUGH */
case '\033':
/* take E not e because \e is \ in *roff */
c = 'E';
/* FALLTHROUGH */
case '\\':
shf_putc('\\', shf);
if (0)
/* FALLTHROUGH */
default:
if (c < 32 || c > 0x7E) {
/* FALLTHROUGH */
case '\'':
shf_fprintf(shf, "\\%03o", c);
break;
}
shf_putc(c, shf);
break;
}
}
inquote = true;
}
if (inquote)
shf_putc('\'', shf);
}
/*
* Print things in columns and rows - func() is called to format
* the i-th element
*/
void
print_columns(struct shf *shf, unsigned int n,
char *(*func)(char *, size_t, unsigned int, const void *),
const void *arg, size_t max_oct, size_t max_colz, bool prefcol)
{
unsigned int i, r, c, rows, cols, nspace, max_col;
char *str;
if (!n)
return;
if (max_colz > 2147483646) {
#ifndef MKSH_SMALL
internal_warningf("print_columns called with %s=%zu >= INT_MAX",
"max_col", max_colz);
#endif
return;
}
max_col = (unsigned int)max_colz;
if (max_oct > 2147483646) {
#ifndef MKSH_SMALL
internal_warningf("print_columns called with %s=%zu >= INT_MAX",
"max_oct", max_oct);
#endif
return;
}
++max_oct;
str = alloc(max_oct, ATEMP);
/*
* We use (max_col + 1) to consider the space separator.
* Note that no space is printed after the last column
* to avoid problems with terminals that have auto-wrap.
*/
cols = x_cols / (max_col + 1);
/* if we can only print one column anyway, skip the goo */
if (cols < 2) {
for (i = 0; i < n; ++i)
shf_fprintf(shf, "%s \n",
(*func)(str, max_oct, i, arg));
goto out;
}
rows = (n + cols - 1) / cols;
if (prefcol && cols > rows) {
i = rows;
rows = cols > n ? n : cols;
cols = i;
}
max_col = -max_col;
nspace = (x_cols + max_col * cols) / cols;
if (nspace <= 0)
nspace = 1;
for (r = 0; r < rows; r++) {
for (c = 0; c < cols; c++) {
i = c * rows + r;
if (i < n) {
shf_fprintf(shf, "%*s", max_col,
(*func)(str, max_oct, i, arg));
if (c + 1 < cols)
shf_fprintf(shf, "%*s", nspace, null);
}
}
shf_putchar('\n', shf);
}
out:
afree(str, ATEMP);
}
/* Strip any nul bytes from buf - returns new length (nbytes - # of nuls) */
void
strip_nuls(char *buf, int nbytes)
{
char *dst;
/*
* nbytes check because some systems (older FreeBSDs) have a
* buggy memchr()
*/
if (nbytes && (dst = memchr(buf, '\0', nbytes))) {
char *end = buf + nbytes;
char *p, *q;
for (p = dst; p < end; p = q) {
/* skip a block of nulls */
while (++p < end && *p == '\0')
;
/* find end of non-null block */
if (!(q = memchr(p, '\0', end - p)))
q = end;
memmove(dst, p, q - p);
dst += q - p;
}
*dst = '\0';
}
}
/*
* Like read(2), but if read fails due to non-blocking flag,
* resets flag and restarts read.
*/
ssize_t
blocking_read(int fd, char *buf, size_t nbytes)
{
ssize_t ret;
bool tried_reset = false;
while ((ret = read(fd, buf, nbytes)) < 0) {
if (!tried_reset && errno == EAGAIN) {
if (reset_nonblock(fd) > 0) {
tried_reset = true;
continue;
}
errno = EAGAIN;
}
break;
}
return (ret);
}
/*
* Reset the non-blocking flag on the specified file descriptor.
* Returns -1 if there was an error, 0 if non-blocking wasn't set,
* 1 if it was.
*/
int
reset_nonblock(int fd)
{
int flags;
if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
return (-1);
if (!(flags & O_NONBLOCK))
return (0);
flags &= ~O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0)
return (-1);
return (1);
}
/* getcwd(3) equivalent, allocates from ATEMP but doesn't resize */
char *
ksh_get_wd(void)
{
#ifdef MKSH__NO_PATH_MAX
char *rv, *cp;
if ((cp = get_current_dir_name())) {
strdupx(rv, cp, ATEMP);
free_gnu_gcdn(cp);
} else
rv = NULL;
#else
char *rv;
if (!getcwd((rv = alloc(PATH_MAX + 1, ATEMP)), PATH_MAX)) {
afree(rv, ATEMP);
rv = NULL;
}
#endif
return (rv);
}
#ifndef ELOOP
#define ELOOP E2BIG
#endif
char *
do_realpath(const char *upath)
{
char *xp, *ip, *tp, *ipath, *ldest = NULL;
XString xs;
ptrdiff_t pos;
size_t len;
int llen;
struct stat sb;
#ifdef MKSH__NO_PATH_MAX
size_t ldestlen = 0;
#define pathlen sb.st_size
#define pathcnd (ldestlen < (pathlen + 1))
#else
#define pathlen PATH_MAX
#define pathcnd (!ldest)
#endif
/* max. recursion depth */
int symlinks = 32;
if (upath[0] == '/') {
/* upath is an absolute pathname */
strdupx(ipath, upath, ATEMP);
} else {
/* upath is a relative pathname, prepend cwd */
if ((tp = ksh_get_wd()) == NULL || tp[0] != '/')
return (NULL);
ipath = shf_smprintf("%s%s%s", tp, "/", upath);
afree(tp, ATEMP);
}
/* ipath and upath are in memory at the same time -> unchecked */
Xinit(xs, xp, strlen(ip = ipath) + 1, ATEMP);
/* now jump into the deep of the loop */
goto beginning_of_a_pathname;
while (*ip) {
/* skip slashes in input */
while (*ip == '/')
++ip;
if (!*ip)
break;
/* get next pathname component from input */
tp = ip;
while (*ip && *ip != '/')
++ip;
len = ip - tp;
/* check input for "." and ".." */
if (tp[0] == '.') {
if (len == 1)
/* just continue with the next one */
continue;
else if (len == 2 && tp[1] == '.') {
/* strip off last pathname component */
while (xp > Xstring(xs, xp))
if (*--xp == '/')
break;
/* then continue with the next one */
continue;
}
}
/* store output position away, then append slash to output */
pos = Xsavepos(xs, xp);
/* 1 for the '/' and len + 1 for tp and the NUL from below */
XcheckN(xs, xp, 1 + len + 1);
Xput(xs, xp, '/');
/* append next pathname component to output */
memcpy(xp, tp, len);
xp += len;
*xp = '\0';
/* lstat the current output, see if it's a symlink */
if (mksh_lstat(Xstring(xs, xp), &sb)) {
/* lstat failed */
if (errno == ENOENT) {
/* because the pathname does not exist */
while (*ip == '/')
/* skip any trailing slashes */
++ip;
/* no more components left? */
if (!*ip)
/* we can still return successfully */
break;
/* more components left? fall through */
}
/* not ENOENT or not at the end of ipath */
goto notfound;
}
/* check if we encountered a symlink? */
if (S_ISLNK(sb.st_mode)) {
#ifndef MKSH__NO_SYMLINK
/* reached maximum recursion depth? */
if (!symlinks--) {
/* yep, prevent infinite loops */
errno = ELOOP;
goto notfound;
}
/* get symlink(7) target */
if (pathcnd) {
#ifdef MKSH__NO_PATH_MAX
if (notoktoadd(pathlen, 1)) {
errno = ENAMETOOLONG;
goto notfound;
}
#endif
ldest = aresize(ldest, pathlen + 1, ATEMP);
}
llen = readlink(Xstring(xs, xp), ldest, pathlen);
if (llen < 0)
/* oops... */
goto notfound;
ldest[llen] = '\0';
/*
* restart if symlink target is an absolute path,
* otherwise continue with currently resolved prefix
*/
/* append rest of current input path to link target */
tp = shf_smprintf("%s%s%s", ldest, *ip ? "/" : "", ip);
afree(ipath, ATEMP);
ip = ipath = tp;
if (ldest[0] != '/') {
/* symlink target is a relative path */
xp = Xrestpos(xs, xp, pos);
} else
#endif
{
/* symlink target is an absolute path */
xp = Xstring(xs, xp);
beginning_of_a_pathname:
/* assert: (ip == ipath)[0] == '/' */
/* assert: xp == xs.beg => start of path */
/* exactly two leading slashes? (SUSv4 3.266) */
if (ip[1] == '/' && ip[2] != '/') {
/* keep them, e.g. for UNC pathnames */
Xput(xs, xp, '/');
}
}
}
/* otherwise (no symlink) merely go on */
}
/*
* either found the target and successfully resolved it,
* or found its parent directory and may create it
*/
if (Xlength(xs, xp) == 0)
/*
* if the resolved pathname is "", make it "/",
* otherwise do not add a trailing slash
*/
Xput(xs, xp, '/');
Xput(xs, xp, '\0');
/*
* if source path had a trailing slash, check if target path
* is not a non-directory existing file
*/
if (ip > ipath && ip[-1] == '/') {
if (stat(Xstring(xs, xp), &sb)) {
if (errno != ENOENT)
goto notfound;
} else if (!S_ISDIR(sb.st_mode)) {
errno = ENOTDIR;
goto notfound;
}
/* target now either does not exist or is a directory */
}
/* return target path */
if (ldest != NULL)
afree(ldest, ATEMP);
afree(ipath, ATEMP);
return (Xclose(xs, xp));
notfound:
/* save; freeing memory might trash it */
llen = errno;
if (ldest != NULL)
afree(ldest, ATEMP);
afree(ipath, ATEMP);
Xfree(xs, xp);
errno = llen;
return (NULL);
#undef pathlen
#undef pathcnd
}
/**
* Makes a filename into result using the following algorithm.
* - make result NULL
* - if file starts with '/', append file to result & set cdpathp to NULL
* - if file starts with ./ or ../ append cwd and file to result
* and set cdpathp to NULL
* - if the first element of cdpathp doesnt start with a '/' xx or '.' xx
* then cwd is appended to result.
* - the first element of cdpathp is appended to result
* - file is appended to result
* - cdpathp is set to the start of the next element in cdpathp (or NULL
* if there are no more elements.
* The return value indicates whether a non-null element from cdpathp
* was appended to result.
*/
static int
make_path(const char *cwd, const char *file,
/* pointer to colon-separated list */
char **cdpathp,
XString *xsp,
int *phys_pathp)
{
int rval = 0;
bool use_cdpath = true;
char *plist;
size_t len, plen = 0;
char *xp = Xstring(*xsp, xp);
if (!file)
file = null;
if (file[0] == '/') {
*phys_pathp = 0;
use_cdpath = false;
} else {
if (file[0] == '.') {
char c = file[1];
if (c == '.')
c = file[2];
if (c == '/' || c == '\0')
use_cdpath = false;
}
plist = *cdpathp;
if (!plist)
use_cdpath = false;
else if (use_cdpath) {
char *pend;
for (pend = plist; *pend && *pend != ':'; pend++)
;
plen = pend - plist;
*cdpathp = *pend ? pend + 1 : NULL;
}
if ((!use_cdpath || !plen || plist[0] != '/') &&
(cwd && *cwd)) {
len = strlen(cwd);
XcheckN(*xsp, xp, len);
memcpy(xp, cwd, len);
xp += len;
if (cwd[len - 1] != '/')
Xput(*xsp, xp, '/');
}
*phys_pathp = Xlength(*xsp, xp);
if (use_cdpath && plen) {
XcheckN(*xsp, xp, plen);
memcpy(xp, plist, plen);
xp += plen;
if (plist[plen - 1] != '/')
Xput(*xsp, xp, '/');
rval = 1;
}
}
len = strlen(file) + 1;
XcheckN(*xsp, xp, len);
memcpy(xp, file, len);
if (!use_cdpath)
*cdpathp = NULL;
return (rval);
}
/*-
* Simplify pathnames containing "." and ".." entries.
*
* simplify_path(this) = that
* /a/b/c/./../d/.. /a/b
* //./C/foo/bar/../baz //C/foo/baz
* /foo/ /foo
* /foo/../../bar /bar
* /foo/./blah/.. /foo
* . .
* .. ..
* ./foo foo
* foo/../../../bar ../../bar
*/
void
simplify_path(char *p)
{
char *dp, *ip, *sp, *tp;
size_t len;
bool needslash;
switch (*p) {
case 0:
return;
case '/':
/* exactly two leading slashes? (SUSv4 3.266) */
if (p[1] == '/' && p[2] != '/')
/* keep them, e.g. for UNC pathnames */
++p;
needslash = true;
break;
default:
needslash = false;
}
dp = ip = sp = p;
while (*ip) {
/* skip slashes in input */
while (*ip == '/')
++ip;
if (!*ip)
break;
/* get next pathname component from input */
tp = ip;
while (*ip && *ip != '/')
++ip;
len = ip - tp;
/* check input for "." and ".." */
if (tp[0] == '.') {
if (len == 1)
/* just continue with the next one */
continue;
else if (len == 2 && tp[1] == '.') {
/* parent level, but how? */
if (*p == '/')
/* absolute path, only one way */
goto strip_last_component;
else if (dp > sp) {
/* relative path, with subpaths */
needslash = false;
strip_last_component:
/* strip off last pathname component */
while (dp > sp)
if (*--dp == '/')
break;
} else {
/* relative path, at its beginning */
if (needslash)
/* or already dotdot-slash'd */
*dp++ = '/';
/* keep dotdot-slash if not absolute */
*dp++ = '.';
*dp++ = '.';
needslash = true;
sp = dp;
}
/* then continue with the next one */
continue;
}
}
if (needslash)
*dp++ = '/';
/* append next pathname component to output */
memmove(dp, tp, len);
dp += len;
/* append slash if we continue */
needslash = true;
/* try next component */
}
if (dp == p)
/* empty path -> dot */
*dp++ = needslash ? '/' : '.';
*dp = '\0';
}
void
set_current_wd(const char *nwd)
{
char *allocd = NULL;
if (nwd == NULL) {
allocd = ksh_get_wd();
nwd = allocd ? allocd : null;
}
afree(current_wd, APERM);
strdupx(current_wd, nwd, APERM);
afree(allocd, ATEMP);
}
int
c_cd(const char **wp)
{
int optc, rv, phys_path;
bool physical = tobool(Flag(FPHYSICAL));
/* was a node from cdpath added in? */
int cdnode;
/* show where we went?, error for $PWD */
bool printpath = false, eflag = false;
struct tbl *pwd_s, *oldpwd_s;
XString xs;
char *dir, *allocd = NULL, *tryp, *pwd, *cdpath;
while ((optc = ksh_getopt(wp, &builtin_opt, "eLP")) != -1)
switch (optc) {
case 'e':
eflag = true;
break;
case 'L':
physical = false;
break;
case 'P':
physical = true;
break;
case '?':
return (2);
}
wp += builtin_opt.optind;
if (Flag(FRESTRICTED)) {
bi_errorf("restricted shell - can't cd");
return (2);
}
pwd_s = global("PWD");
oldpwd_s = global("OLDPWD");
if (!wp[0]) {
/* No arguments - go home */
if ((dir = str_val(global("HOME"))) == null) {
bi_errorf("no home directory (HOME not set)");
return (2);
}
} else if (!wp[1]) {
/* One argument: - or dir */
strdupx(allocd, wp[0], ATEMP);
if (ksh_isdash((dir = allocd))) {
afree(allocd, ATEMP);
allocd = NULL;
dir = str_val(oldpwd_s);
if (dir == null) {
bi_errorf("no OLDPWD");
return (2);
}
printpath = true;
}
} else if (!wp[2]) {
/* Two arguments - substitute arg1 in PWD for arg2 */
size_t ilen, olen, nlen, elen;
char *cp;
if (!current_wd[0]) {
bi_errorf("can't determine current directory");
return (2);
}
/*
* substitute arg1 for arg2 in current path.
* if the first substitution fails because the cd fails
* we could try to find another substitution. For now
* we don't
*/
if ((cp = strstr(current_wd, wp[0])) == NULL) {
bi_errorf("bad substitution");
return (2);
}
/*-
* ilen = part of current_wd before wp[0]
* elen = part of current_wd after wp[0]
* because current_wd and wp[1] need to be in memory at the
* same time beforehand the addition can stay unchecked
*/
ilen = cp - current_wd;
olen = strlen(wp[0]);
nlen = strlen(wp[1]);
elen = strlen(current_wd + ilen + olen) + 1;
dir = allocd = alloc(ilen + nlen + elen, ATEMP);
memcpy(dir, current_wd, ilen);
memcpy(dir + ilen, wp[1], nlen);
memcpy(dir + ilen + nlen, current_wd + ilen + olen, elen);
printpath = true;
} else {
bi_errorf("too many arguments");
return (2);
}
#ifdef MKSH__NO_PATH_MAX
/* only a first guess; make_path will enlarge xs if necessary */
XinitN(xs, 1024, ATEMP);
#else
XinitN(xs, PATH_MAX, ATEMP);
#endif
cdpath = str_val(global("CDPATH"));
do {
cdnode = make_path(current_wd, dir, &cdpath, &xs, &phys_path);
if (physical)
rv = chdir(tryp = Xstring(xs, xp) + phys_path);
else {
simplify_path(Xstring(xs, xp));
rv = chdir(tryp = Xstring(xs, xp));
}
} while (rv < 0 && cdpath != NULL);
if (rv < 0) {
if (cdnode)
bi_errorf("%s: %s", dir, "bad directory");
else
bi_errorf("%s: %s", tryp, strerror(errno));
afree(allocd, ATEMP);
Xfree(xs, xp);
return (2);
}
rv = 0;
/* allocd (above) => dir, which is no longer used */
afree(allocd, ATEMP);
allocd = NULL;
/* Clear out tracked aliases with relative paths */
flushcom(false);
/*
* Set OLDPWD (note: unsetting OLDPWD does not disable this
* setting in AT&T ksh)
*/
if (current_wd[0])
/* Ignore failure (happens if readonly or integer) */
setstr(oldpwd_s, current_wd, KSH_RETURN_ERROR);
if (Xstring(xs, xp)[0] != '/') {
pwd = NULL;
} else if (!physical) {
goto norealpath_PWD;
} else if ((pwd = allocd = do_realpath(Xstring(xs, xp))) == NULL) {
if (eflag)
rv = 1;
norealpath_PWD:
pwd = Xstring(xs, xp);
}
/* Set PWD */
if (pwd) {
char *ptmp = pwd;
set_current_wd(ptmp);
/* Ignore failure (happens if readonly or integer) */
setstr(pwd_s, ptmp, KSH_RETURN_ERROR);
} else {
set_current_wd(null);
pwd = Xstring(xs, xp);
/* XXX unset $PWD? */
if (eflag)
rv = 1;
}
if (printpath || cdnode)
shprintf("%s\n", pwd);
afree(allocd, ATEMP);
Xfree(xs, xp);
return (rv);
}
#ifdef KSH_CHVT_CODE
extern void chvt_reinit(void);
static void
chvt(const char *fn)
{
char dv[20];
struct stat sb;
int fd;
if (*fn == '-') {
memcpy(dv, "-/dev/null", sizeof("-/dev/null"));
fn = dv + 1;
} else {
if (stat(fn, &sb)) {
memcpy(dv, "/dev/ttyC", 9);
strlcpy(dv + 9, fn, sizeof(dv) - 9);
if (stat(dv, &sb)) {
strlcpy(dv + 8, fn, sizeof(dv) - 8);
if (stat(dv, &sb))
errorf("%s: %s %s", "chvt",
"can't find tty", fn);
}
fn = dv;
}
if (!(sb.st_mode & S_IFCHR))
errorf("%s %s %s", "chvt: not a char", "device", fn);
if ((sb.st_uid != 0) && chown(fn, 0, 0))
warningf(false, "%s: %s %s", "chvt", "can't chown root", fn);
if (((sb.st_mode & 07777) != 0600) && chmod(fn, (mode_t)0600))
warningf(false, "%s: %s %s", "chvt", "can't chmod 0600", fn);
#if HAVE_REVOKE
if (revoke(fn))
#endif
warningf(false, "%s: %s %s", "chvt",
"new shell is potentially insecure, can't revoke",
fn);
}
if ((fd = open(fn, O_RDWR)) == -1) {
sleep(1);
if ((fd = open(fn, O_RDWR)) == -1)
errorf("%s: %s %s", "chvt", "can't open", fn);
}
switch (fork()) {
case -1:
errorf("%s: %s %s", "chvt", "fork", "failed");
case 0:
break;
default:
exit(0);
}
if (setsid() == -1)
errorf("%s: %s %s", "chvt", "setsid", "failed");
if (fn != dv + 1) {
if (ioctl(fd, TIOCSCTTY, NULL) == -1)
errorf("%s: %s %s", "chvt", "TIOCSCTTY", "failed");
if (tcflush(fd, TCIOFLUSH))
errorf("%s: %s %s", "chvt", "TCIOFLUSH", "failed");
}
ksh_dup2(fd, 0, false);
ksh_dup2(fd, 1, false);
ksh_dup2(fd, 2, false);
if (fd > 2)
close(fd);
{
register uint32_t h;
NZATInit(h);
NZATUpdateMem(h, &rndsetupstate, sizeof(rndsetupstate));
NZAATFinish(h);
rndset((long)h);
}
chvt_reinit();
}
#endif
#ifdef DEBUG
char *
strchr(char *p, int ch)
{
for (;; ++p) {
if (*p == ch)
return (p);
if (!*p)
return (NULL);
}
/* NOTREACHED */
}
char *
strstr(char *b, const char *l)
{
char first, c;
size_t n;
if ((first = *l++) == '\0')
return (b);
n = strlen(l);
strstr_look:
while ((c = *b++) != first)
if (c == '\0')
return (NULL);
if (strncmp(b, l, n))
goto strstr_look;
return (b - 1);
}
#endif
#if defined(MKSH_SMALL) && !defined(MKSH_SMALL_BUT_FAST)
char *
strndup_i(const char *src, size_t len, Area *ap)
{
char *dst = NULL;
if (src != NULL) {
dst = alloc(len + 1, ap);
memcpy(dst, src, len);
dst[len] = '\0';
}
return (dst);
}
char *
strdup_i(const char *src, Area *ap)
{
return (src == NULL ? NULL : strndup_i(src, strlen(src), ap));
}
#endif
#if !HAVE_GETRUSAGE
#define INVTCK(r,t) do { \
r.tv_usec = ((t) % (1000000 / CLK_TCK)) * (1000000 / CLK_TCK); \
r.tv_sec = (t) / CLK_TCK; \
} while (/* CONSTCOND */ 0)
int
getrusage(int what, struct rusage *ru)
{
struct tms tms;
clock_t u, s;
if (/* ru == NULL || */ times(&tms) == (clock_t)-1)
return (-1);
switch (what) {
case RUSAGE_SELF:
u = tms.tms_utime;
s = tms.tms_stime;
break;
case RUSAGE_CHILDREN:
u = tms.tms_cutime;
s = tms.tms_cstime;
break;
default:
errno = EINVAL;
return (-1);
}
INVTCK(ru->ru_utime, u);
INVTCK(ru->ru_stime, s);
return (0);
}
#endif
/*
* process the string available via fg (get a char)
* and fp (put back a char) for backslash escapes,
* assuming the first call to *fg gets the char di-
* rectly after the backslash; return the character
* (0..0xFF), Unicode (wc + 0x100), or -1 if no known
* escape sequence was found
*/
int
unbksl(bool cstyle, int (*fg)(void), void (*fp)(int))
{
int wc, i, c, fc;
fc = (*fg)();
switch (fc) {
case 'a':
/*
* according to the comments in pdksh, \007 seems
* to be more portable than \a (due to HP-UX cc,
* Ultrix cc, old pcc, etc.) so we avoid the escape
* sequence altogether in mksh and assume ASCII
*/
wc = 7;
break;
case 'b':
wc = '\b';
break;
case 'c':
if (!cstyle)
goto unknown_escape;
c = (*fg)();
wc = CTRL(c);
break;
case 'E':
case 'e':
wc = 033;
break;
case 'f':
wc = '\f';
break;
case 'n':
wc = '\n';
break;
case 'r':
wc = '\r';
break;
case 't':
wc = '\t';
break;
case 'v':
/* assume ASCII here as well */
wc = 11;
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
if (!cstyle)
goto unknown_escape;
/* FALLTHROUGH */
case '0':
if (cstyle)
(*fp)(fc);
/*
* look for an octal number with up to three
* digits, not counting the leading zero;
* convert it to a raw octet
*/
wc = 0;
i = 3;
while (i--)
if ((c = (*fg)()) >= '0' && c <= '7')
wc = (wc << 3) + (c - '0');
else {
(*fp)(c);
break;
}
break;
case 'U':
i = 8;
if (/* CONSTCOND */ 0)
/* FALLTHROUGH */
case 'u':
i = 4;
if (/* CONSTCOND */ 0)
/* FALLTHROUGH */
case 'x':
i = cstyle ? -1 : 2;
/**
* x: look for a hexadecimal number with up to
* two (C style: arbitrary) digits; convert
* to raw octet (C style: Unicode if >0xFF)
* u/U: look for a hexadecimal number with up to
* four (U: eight) digits; convert to Unicode
*/
wc = 0;
while (i--) {
wc <<= 4;
if ((c = (*fg)()) >= '0' && c <= '9')
wc += c - '0';
else if (c >= 'A' && c <= 'F')
wc += c - 'A' + 10;
else if (c >= 'a' && c <= 'f')
wc += c - 'a' + 10;
else {
wc >>= 4;
(*fp)(c);
break;
}
}
if ((cstyle && wc > 0xFF) || fc != 'x')
/* Unicode marker */
wc += 0x100;
break;
case '\'':
if (!cstyle)
goto unknown_escape;
wc = '\'';
break;
case '\\':
wc = '\\';
break;
default:
unknown_escape:
(*fp)(fc);
return (-1);
}
return (wc);
}
Reference in New Issue View Git Blame Copy Permalink