/
misc.c
2964 lines (2745 loc) · 64.8 KB
/
misc.c
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/* $OpenBSD: misc.c,v 1.41 2015/09/10 22:48:58 nicm Exp $ */
/* $OpenBSD: path.c,v 1.13 2015/09/05 09:47:08 jsg Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
* 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019,
* 2020, 2021, 2022, 2023
* mirabilos <m@mirbsd.org>
* Copyright (c) 2015
* Daniel Richard G. <skunk@iSKUNK.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"
__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.359 2023/09/17 01:54:04 tg Exp $");
static const unsigned char *pat_scan(const unsigned char *,
const unsigned char *, Wahr);
static int do_gmatch(const unsigned char *, const unsigned char *,
const unsigned char *, const unsigned char *,
const unsigned char *);
static const unsigned char *gmatch_cclass(const unsigned char *, unsigned char);
static void chvt(const Getopt *);
static unsigned int dollarqU(struct shf *, const unsigned char *);
#ifndef MKSH_SMALL
static void dollarq8(struct shf *, const unsigned char *);
#else
#define dollarq8 dollarqU
#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) \
kerrf(KWF_ERR(1) | KWF_PREFIX | KWF_FILELINE | \
KWF_TWOMSG, #func, "failed, probably due to a" \
" too low process limit; aborting"); \
} while (/* CONSTCOND */ 0)
#else
#define DO_SETUID(func,argvec) func argvec
#endif
/* called from XcheckN() to grow buffer */
char *
Xcheck_grow(XString *xsp, const char *xp, size_t more)
{
size_t old_ofs = xp - 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 + old_ofs);
}
#define SHFLAGS_DEFNS
#define FN(sname,cname,flags,ochar) \
static const struct shoptionS_ ## cname { \
/* character flag (if any) */ \
char c; \
/* OF_* */ \
unsigned char optflags; \
/* long name of option */ \
char name[sizeof(sname)]; \
} shoptione_ ## cname = { \
ochar, flags, sname \
};
#include "sh_flags.gen"
mbCTA_BEG(sh_flags_gen);
#define FN(sname,cname,flags,ochar) mbccCTA(o_ ## cname, ( \
offsetof(struct shoptionS_ ## cname, optflags) == 1 && \
offsetof(struct shoptionS_ ## cname, name) == 2));
#include "sh_flags.gen"
mbCTA_END(sh_flags_gen);
#define OFC(i) (options[i][-2])
#define OFF(i) (((const unsigned char *)options[i])[-1])
#define OFN(i) (options[i])
const char * const options[] = {
#define SHFLAGS_ITEMS
#include "sh_flags.gen"
};
/*
* translate -o option into F* constant (also used for test -o option)
*/
size_t
option(const char *n)
{
size_t i = 0;
if (ctype(n[0], C_MINUS | C_PLUS) && n[1] && !n[2])
while (i < NELEM(options)) {
if (OFC(i) == n[1])
return (i);
++i;
}
else
while (i < NELEM(options)) {
if (!strcmp(OFN(i), n))
return (i);
++i;
}
return ((size_t)-1);
}
struct options_info {
int opt_width;
int opts[NELEM(options)];
};
static void options_fmt_entry(char *, size_t, unsigned int, const void *);
static int printoptions(Wahr);
static int printoption(size_t);
/* format a single select menu item */
static void
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, OFN(oi->opts[i]),
Flag(oi->opts[i]) ? "on" : "off");
}
static int
printoption(size_t i)
{
if (Flag(i) == baseline_flags[i])
return (0);
if (!OFN(i)[0]) {
#if !defined(MKSH_SMALL) || defined(DEBUG)
bi_errorf(Tf_sd, "change in unnamed option", (int)i);
#endif
return (1);
}
if (Flag(i) != 0 && Flag(i) != 1) {
#if !defined(MKSH_SMALL) || defined(DEBUG)
bi_errorf(Tf_s_sD_s, Tdo, OFN(i), "not 0 or 1");
#endif
return (1);
}
shprintf(Tf__s_s, Flag(i) ? Tdo : Tpo, OFN(i));
return (0);
}
static int
printoptions(Wahr verbose)
{
size_t i = 0;
int rv = 0;
if (verbose) {
size_t n = 0, len, octs = 0;
struct options_info oi;
struct columnise_opts co;
/* verbose version */
shf_puts("Current option settings\n", shl_stdout);
oi.opt_width = 0;
while (i < NELEM(options)) {
if ((len = strlen(OFN(i)))) {
oi.opts[n++] = i;
if (len > octs)
octs = len;
len = utf_mbswidth(OFN(i));
if ((int)len > oi.opt_width)
oi.opt_width = (int)len;
}
++i;
}
co.shf = shl_stdout;
co.linesep = '\n';
co.prefcol = co.do_last = Ja;
print_columns(&co, n, options_fmt_entry, &oi,
octs + 4, oi.opt_width + 4);
} else {
/* short version like AT&T ksh93 */
shf_puts(Tset, shl_stdout);
shf_puts(To_o_reset, shl_stdout);
printoption(FSH);
printoption(FPOSIX);
while (i < FNFLAGS) {
if (i != FSH && i != FPOSIX)
rv |= printoption(i);
++i;
}
shf_putc('\n', shl_stdout);
}
return (rv);
}
char *
getoptions(void)
{
size_t i = 0;
char c, m[(int)FNFLAGS + 1];
char *cp = m;
while (i < NELEM(options)) {
if ((c = OFC(i)) && Flag(i))
*cp++ = c;
++i;
}
strndupx(cp, m, cp - m, ATEMP);
return (cp);
}
/* change a Flag(*) value; takes care of special actions */
void
change_flag(enum sh_flag f,
/* OF_INTERNAL, OF_FIRSTTIME, OF_CMDLINE, or OF_SET */
unsigned int what,
Wahr newset)
{
unsigned char oldval = Flag(f);
unsigned char newval = (newset ? 1 : 0);
if (f == FXTRACE) {
change_xtrace(newval, Ja);
return;
} else if (f == FPRIVILEGED) {
if (!oldval)
/* no getting back dropped privs */
return;
else if (!newval) {
/* turning off -p */
kshegid = kshgid;
ksheuid = kshuid;
} else if (oldval != 3)
/* nor going full sugid */
goto change_flag;
/* +++ set group IDs +++ */
#if HAVE_SETRESUGID
DO_SETUID(setresgid, (kshegid, kshegid, kshgid));
#else /* !HAVE_SETRESUGID */
/* setgid, setegid don't EAGAIN on Linux */
setgid(kshegid);
#ifndef MKSH__NO_SETEUGID
setegid(kshegid);
#endif /* !MKSH__NO_SETEUGID */
#endif /* !HAVE_SETRESUGID */
/* +++ wipe groups vector +++ */
#if HAVE_SETGROUPS
/* setgroups doesn't EAGAIN on Linux */
setgroups(0, NULL);
#endif /* HAVE_SETGROUPS */
/* +++ set user IDs +++ */
#if HAVE_SETRESUGID
DO_SETUID(setresuid, (ksheuid, ksheuid, kshuid));
#else /* !HAVE_SETRESUGID */
/* seteuid doesn't EAGAIN on Linux */
DO_SETUID(setuid, (ksheuid));
#ifndef MKSH__NO_SETEUGID
seteuid(ksheuid);
#endif /* !MKSH__NO_SETEUGID */
#endif /* !HAVE_SETRESUGID */
/* +++ privs changed +++ */
} else if ((f == FPOSIX || f == FSH) && newval) {
/* Turning on -o posix or -o sh? */
Flag(FBRACEEXPAND) = 0;
#ifndef MKSH_NO_CMDLINE_EDITING
} else if ((f == FEMACS ||
#if !MKSH_S_NOVI
f == FVI ||
#endif
f == FGMACS) && newval) {
#if !MKSH_S_NOVI
Flag(FVI) = 0;
#endif
Flag(FEMACS) = Flag(FGMACS) = 0;
#endif
}
change_flag:
Flag(f) = newval;
if (f == FTALKING) {
/* Changing interactive flag? */
if (what == OF_CMDLINE && procpid == kshpid)
Flag(FTALKING_I) = newval;
#ifndef MKSH_UNEMPLOYED
} else if (f == FMONITOR) {
if (what != OF_CMDLINE && newval != oldval)
j_change();
#endif
}
}
void
change_xtrace(unsigned char newval, Wahr dosnapshot)
{
static Wahr in_xtrace;
if (in_xtrace)
return;
if (!dosnapshot && newval == Flag(FXTRACE))
return;
if (Flag(FXTRACE) == 2) {
shf_putc('\n', shl_xtrace);
Flag(FXTRACE) = 1;
shf_flush(shl_xtrace);
}
if (!dosnapshot && Flag(FXTRACE) == 1)
switch (newval) {
case 1:
return;
case 2:
goto changed_xtrace;
}
shf_flush(shl_xtrace);
if (shl_xtrace->fd != 2)
close(shl_xtrace->fd);
if (!newval || (shl_xtrace->fd = savefd(2)) == -1)
shl_xtrace->fd = 2;
changed_xtrace:
if ((Flag(FXTRACE) = newval) == 2) {
in_xtrace = Ja;
Flag(FXTRACE) = 0;
shf_putsv(substitute(str_val(global("PS4")), 0), shl_xtrace);
Flag(FXTRACE) = 2;
in_xtrace = Nee;
}
}
/*
* 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_FIRSTTIME, OF_CMDLINE, or OF_SET */
unsigned int what,
Wahr *setargsp)
{
static const char cmd_opts[] =
#define SHFLAGS_NOT_SET
#define SHFLAGS_OPTCS
#include "sh_flags.gen"
#undef SHFLAGS_NOT_SET
;
static const char set_opts[] =
#define SHFLAGS_NOT_CMD
#define SHFLAGS_OPTCS
#include "sh_flags.gen"
#undef SHFLAGS_NOT_CMD
;
Wahr set;
const char * const opts = what == OF_SET ? set_opts : cmd_opts;
const char *array = NULL;
Getopt go;
size_t i;
int optc, arrayset = 0;
Wahr sortargs = Nee;
Wahr fcompatseen = Nee;
ksh_getopt_reset(&go, GF_ERROR|GF_PLUSOPT);
while ((optc = ksh_getopt(argv, &go, opts)) != -1) {
set = isWahr(!(go.info & GI_PLUS));
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 (i.e. can't get here if what is
* not OF_SET).
*/
#if !defined(MKSH_SMALL) || defined(DEBUG)
if (!set && !baseline_flags[(int)FNFLAGS]) {
bi_errorf(Ttooearly, T_set_po);
return (-1);
}
#endif
if (printoptions(set))
return (-1);
break;
}
i = option(go.optarg);
if ((i == FPOSIX || i == FSH) && set && !fcompatseen) {
/*
* If running 'set -o posix' or
* 'set -o sh', turn off the other;
* if running 'set -o posix -o sh'
* allow both to be set though.
*/
Flag(FPOSIX) = 0;
Flag(FSH) = 0;
fcompatseen = Ja;
}
if ((i != (size_t)-1) && (set ? 1U : 0U) == 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) && (OFF(i) & what))
change_flag((enum sh_flag)i, what, set);
else if (!strcmp(go.optarg, To_reset)) {
#if !defined(MKSH_SMALL) || defined(DEBUG)
if (!baseline_flags[(int)FNFLAGS]) {
bi_errorf(Ttooearly, To_o_reset);
return (-1);
}
#endif
/*
* ordering, with respect to side effects,
* was ensured above by printoptions
*/
for (i = 0; i < FNFLAGS; ++i)
if (Flag(i) != baseline_flags[i])
change_flag((enum sh_flag)i,
what, baseline_flags[i]);
} else {
bi_errorf(Tf_sD_s, go.optarg,
Tunknown_option);
return (-1);
}
break;
case 'T':
if (what != OF_FIRSTTIME)
break;
chvt(&go);
break;
case '?':
return (-1);
default:
if (what == OF_FIRSTTIME)
break;
/* -s: sort positional params (via AT&T ksh) */
if (what == OF_SET && isch(optc, 's')) {
sortargs = Ja;
break;
}
for (i = 0; i < NELEM(options); i++)
if (optc == OFC(i) &&
(what & OFF(i))) {
change_flag((enum sh_flag)i, what, set);
break;
}
if (i == NELEM(options))
kerrf0(KWF_INTERNAL | KWF_ERR(0xFF) | KWF_NOERRNO,
"parse_args: '%c'", optc);
}
}
/* lone ‘-’ (or ‘+’)? */
if (argv[go.optind] &&
ctype(argv[go.optind][0], C_MINUS | C_PLUS) &&
argv[go.optind][1] == '\0' &&
!(go.info & GI_MINUSMINUS)) {
/* POSIX: lone hyphen-minus sh first arg ignored */
if (what == OF_SET && isch(argv[go.optind][0], '-')) {
/* set; lone dash clears -v and -x flags (obsolete) */
Flag(FVERBOSE) = 0;
change_xtrace(0, Nee);
}
/* either way, skip it (POSIX only dash but… meh) */
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 && *array)
ccp = skip_varname(array, Nee);
if (!ccp || !(!ccp[0] || (ccp[0] == '+' && !ccp[1]))) {
bi_errorf(Tf_sD_s, array, Tnot_ident);
return (-1);
}
}
if (sortargs) {
for (i = go.optind; argv[i]; i++)
;
qsort(&argv[go.optind], i - go.optind, sizeof(void *),
ascpstrcmp);
}
if (arrayset)
go.optind += set_array(array, isWahr(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)
{
if (!getpn(&s, ai))
return (0);
if (!*s)
return (1);
errno = EINVAL;
return (0);
}
int
getnh(const char *s, mbiHUGE_U *ai)
{
if (!getpnh(&s, ai))
return (0);
if (!*s)
return (1);
errno = EINVAL;
return (0);
}
/*
* parse a decimal number
* on success, returns 1 and *ai contains it and *sp points past it
* on overflow, returns 0, *ai is 0, *sp points behind the parsed number
* on parse error (not numeric) returns 0, *ai is 0, *sp is not changed
*/
int
getpn(const char **sp, int *ai)
{
char c;
const char *s;
mksh_uari_t num = 0;
kby state = 0;
Wahr neg = Nee;
s = *sp;
do {
c = *s++;
} while (ctype(c, C_SPACE));
switch (c) {
case '-':
neg = Ja;
/* FALLTHROUGH */
case '+':
c = *s++;
break;
}
while (ctype(c, C_DIGIT)) {
/*XXX this supposed to return int? */
if (num > 214748364U) {
/* overflow on multiplication */
state = 2;
errno = EOVERFLOW;
}
if (state < 2) {
state = 1;
num = num * 10U + (unsigned int)ksh_numdig(c);
}
/* now: num <= 2147483649U */
c = *s++;
}
--s;
if (num > (neg ? 2147483648U : 2147483647U)) {
/* overflow for signed 32-bit int */
state = 2;
errno = EOVERFLOW;
}
if (state)
*sp = s;
else
errno = EINVAL;
if (state != 1) {
*ai = 0;
return (0);
}
/*XXX this supposed to return int?!?!?!?! */
*ai = (neg && num > 0) ?
(mksh_ari_t)(-(mksh_ari_t)((num - 1U) & 0x7FFFFFFF) - 1) :
(mksh_ari_t)num;
return (1);
}
int
getpnh(const char **sp, mbiHUGE_U *ai)
{
char c;
const char *s;
mbiHUGE_U num = 0;
kby state = 0;
Wahr neg = Nee;
s = *sp;
do {
c = *s++;
} while (ctype(c, C_SPACE));
switch (c) {
case '-':
neg = Ja;
/* FALLTHROUGH */
case '+':
c = *s++;
break;
}
while (ctype(c, C_DIGIT)) {
if (num > (mbiHUGE_U_MAX / 10U)) {
/* overflow on multiplication */
state = 2;
errno = EOVERFLOW;
}
num *= 10U;
if (num > (mbiHUGE_U_MAX - (unsigned int)ksh_numdig(c))) {
/* overflow on addition */
state = 2;
errno = EOVERFLOW;
}
if (state < 2) {
num += (unsigned int)ksh_numdig(c);
state = 1;
}
c = *s++;
}
--s;
if (state)
*sp = s;
else
errno = EINVAL;
if (state != 1) {
*ai = 0;
return (0);
}
*ai = neg ? (mbiHUGE_U)-(mbiHUGE_U)num : num;
return (1);
}
/**
* pattern simplifications:
* - @(x) -> x (not @(x|y) though)
* - ** -> *
*/
static void *
simplify_gmatch_pattern(const unsigned char *sp)
{
kby 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 = strnul(sp);
while ((c = *sp++)) {
if (!ISMAGIC(c)) {
*dp++ = c;
continue;
}
switch (ord((c = *sp++))) {
case ORD(0x80|'@'):
/* simile for @ */
case ORD(0x80|' '):
/* check whether it has only one clause */
ps = pat_scan(sp, se, Ja);
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, Wahr isfile)
{
const char *se, *pe;
char *pnew;
int rv;
if (s == NULL || p == NULL)
return (0);
pe = strnul(p);
/*
* isfile is Nee iff no syntax check has been done on the pattern.
* If check fails just do a strcmp().
*/
if (!isfile && !has_globbing(p)) {
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));
}
se = strnul(s);
/*
* since the do_gmatch() engine sucks so much, we must do some
* pattern simplifications
*/
pnew = simplify_gmatch_pattern((const unsigned char *)p);
pe = strnul(pnew);
rv = do_gmatch((const unsigned char *)s, (const unsigned char *)se,
(const unsigned char *)pnew, (const unsigned char *)pe,
(const unsigned char *)s);
afree(pnew, ATEMP);
return (rv);
}
/**
* Returns if p is a syntacticly correct globbing pattern, Nee 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 ?
*/
Wahr
has_globbing(const char *pat)
{
unsigned char c, subc;
Wahr saw_glob = Nee;
unsigned int nest = 0;
const unsigned char *p = (const unsigned char *)pat;
const unsigned char *s;
while ((c = *p++)) {
/* regular character? ok. */
if (!ISMAGIC(c))
continue;
/* MAGIC + NUL? abort. */
if (!(c = *p++))
return (Nee);
/* some specials */
if (ord(c) == ORD('*') || ord(c) == ORD('?')) {
/* easy glob, accept */
saw_glob = Ja;
} else if (ord(c) == ORD('[')) {
/* bracket expression; eat negation and initial ] */
if (ISMAGIC(p[0]) && ord(p[1]) == ORD('!'))
p += 2;
if (ISMAGIC(p[0]) && ord(p[1]) == ORD(']'))
p += 2;
/* check next string part */
s = p;
while ((c = *s++)) {
/* regular chars are ok */
if (!ISMAGIC(c))
continue;
/* MAGIC + NUL cannot happen */
if (!(c = *s++))
return (Nee);
/* terminating bracket? */
if (ord(c) == ORD(']')) {
/* accept and continue */
p = s;
saw_glob = Ja;
break;
}
/* sub-bracket expressions */
if (ord(c) == ORD('[') && (
/* collating element? */
ord(*s) == ORD('.') ||
/* equivalence class? */
ord(*s) == ORD('=') ||
/* character class? */
ord(*s) == ORD(':'))) {
/* must stop with exactly the same c */
subc = *s++;
/* arbitrarily many chars in betwixt */
while ((c = *s++))
/* but only this sequence... */
if (c == subc && ISMAGIC(*s) &&
ord(s[1]) == ORD(']')) {
/* accept, terminate */
s += 2;
break;
}
/* EOS without: reject bracket expr */
if (!c)
break;
/* continue; */
}
/* anything else just goes on */
}
} else if ((c & 0x80) && ctype(c & 0x7F, C_PATMO | C_SPC)) {
/* opening pattern */
saw_glob = Ja;
++nest;
} else if (ord(c) == ORD(/*(*/ ')')) {
/* closing pattern */
if (nest)
--nest;
}
}
return (saw_glob && !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,
const unsigned char *smin)
{
unsigned char sc, pc, sl = 0;
const unsigned char *prest, *psub, *pnext;
const unsigned char *srest;
if (s == NULL || p == NULL)
return (0);
if (s > smin && s <= se)
sl = s[-1];
while (p < pe) {
pc = *p++;
sc = s < se ? *s : '\0';
s++;
if (!ISMAGIC(pc)) {
if (sc != pc)
return (0);
sl = sc;
continue;
}
switch (ord(*p++)) {
case ORD('['):
/* BSD cclass extension? */
if (ISMAGIC(p[0]) && ord(p[1]) == ORD('[') &&
ord(p[2]) == ORD(':') &&
ctype((pc = p[3]), C_ANGLE) &&
ord(p[4]) == ORD(':') &&
ISMAGIC(p[5]) && ord(p[6]) == ORD(']') &&
ISMAGIC(p[7]) && ord(p[8]) == ORD(']')) {
/* zero-length match */
--s;
p += 9;
/* word begin? */
if (ord(pc) == ORD('<') &&
!ctype(sl, C_ALNUX) &&
ctype(sc, C_ALNUX))
break;
/* word end? */
if (ord(pc) == ORD('>') &&
ctype(sl, C_ALNUX) &&
!ctype(sc, C_ALNUX))
break;
/* neither */
return (0);
}
if (sc == 0 || (p = gmatch_cclass(p, sc)) == NULL)
return (0);
break;
case ORD('?'):
if (sc == 0)
return (0);
if (UTFMODE) {
--s;
s += ez_mbtoc(NULL, (const void *)s);
}
break;
case ORD('*'):
if (p == pe)
return (1);
s--;
do {
if (do_gmatch(s, se, p, pe, smin))
return (1);
} while (s++ < se);
return (0);
/**
* [+*?@!](pattern|pattern|..)
* This is also needed for ${..%..}, etc.
*/
/* matches one or more times */
case ORD('+') | 0x80:
/* matches zero or more times */
case ORD('*') | 0x80:
if (!(prest = pat_scan(p, pe, Nee)))
return (0);
s--;
/* take care of zero matches */
if (ord(p[-1]) == (0x80 | ORD('*')) &&
do_gmatch(s, se, prest, pe, smin))
return (1);
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, Ja);
for (srest = s; srest <= se; srest++) {
if (do_gmatch(s, srest, psub, pnext - 2, smin) &&
(do_gmatch(srest, se, prest, pe, smin) ||
(s != srest &&
do_gmatch(srest, se, p - 2, pe, smin))))
return (1);
}
if (pnext == prest)
break;
}