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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
* mirabilos <[email protected]>
* Copyright (c) 2015
* Daniel Richard G. <[email protected]>
*
* 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 1.293 2018/08/10 02:53:35 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
/* type bits for unsigned char */
unsigned char chtypes[UCHAR_MAX + 1];
static const unsigned char *pat_scan(const unsigned char *,
const unsigned char *, bool) MKSH_A_PURE;
static int do_gmatch(const unsigned char *, const unsigned char *,
const unsigned char *, const unsigned char *,
const unsigned char *) MKSH_A_PURE;
static const unsigned char *gmatch_cclass(const unsigned char *, unsigned char)
MKSH_A_PURE;
#ifdef KSH_CHVT_CODE
static void chvt(const Getopt *);
#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
/* 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
#define FN(sname,cname,flags,ochar) \
static const struct { \
/* 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"
#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 void printoptions(bool);
/* 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 void
printoptions(bool verbose)
{
size_t i = 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 = true;
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);
while (i < NELEM(options)) {
if (Flag(i) && OFN(i)[0])
shprintf(" -o %s", OFN(i));
++i;
}
shf_putc('\n', shl_stdout);
}
}
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, int what, bool newset)
{
unsigned char oldval;
unsigned char newval = (newset ? 1 : 0);
if (f == FXTRACE) {
change_xtrace(newval, true);
return;
}
oldval = Flag(f);
Flag(f) = newval = (newset ? 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) = newval;
} else
#endif
if (f == FPRIVILEGED && oldval && !newval) {
/* Turning off -p? */
/*XXX this can probably be optimised */
kshegid = kshgid = getgid();
ksheuid = kshuid = getuid();
#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 /* !HAVE_SETRESUGID */
/* setgid, setegid, seteuid don't EAGAIN on Linux */
setgid(kshegid);
#ifndef MKSH__NO_SETEUGID
setegid(kshegid);
#endif
DO_SETUID(setuid, (ksheuid));
#ifndef MKSH__NO_SETEUGID
seteuid(ksheuid);
#endif
#endif /* !HAVE_SETRESUGID */
} else if ((f == FPOSIX || f == FSH) && newval) {
/* Turning on -o posix or -o sh? */
Flag(FBRACEEXPAND) = 0;
/* Turning on -o posix? */
if (f == FPOSIX) {
/* C locale required for compliance */
UTFMODE = 0;
}
} else if (f == FTALKING) {
/* Changing interactive flag? */
if ((what == OF_CMDLINE || what == OF_SET) && procpid == kshpid)
Flag(FTALKING_I) = newval;
}
}
void
change_xtrace(unsigned char newval, bool dosnapshot)
{
static bool 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 = true;
Flag(FXTRACE) = 0;
shf_puts(substitute(str_val(global("PS4")), 0), shl_xtrace);
Flag(FXTRACE) = 2;
in_xtrace = false;
}
}
/*
* 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 */
int what,
bool *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
;
bool set;
const char *opts;
const char *array = NULL;
Getopt go;
size_t i;
int optc, arrayset = 0;
bool sortargs = false;
bool fcompatseen = false;
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 (mksh_cdirsep(*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 = tobool(!(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 (ie, can't get here if what is
* OF_CMDLINE).
*/
printoptions(set);
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 = true;
}
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 {
bi_errorf(Tf_sD_s, go.optarg,
Tunknown_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, true);
chvt(&go);
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 == OFC(i) &&
(what & OFF(i))) {
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] &&
ctype(argv[go.optind][0], C_MINUS | C_PLUS) &&
argv[go.optind][1] == '\0') {
/* lone - clears -v and -x flags */
if (argv[go.optind][0] == '-') {
Flag(FVERBOSE) = 0;
change_xtrace(0, false);
}
/* 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 && *array)
ccp = skip_varname(array, false);
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, 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)
{
char c;
mksh_ari_u num;
bool neg = false;
num.u = 0;
do {
c = *s++;
} while (ctype(c, C_SPACE));
switch (c) {
case '-':
neg = true;
/* FALLTHROUGH */
case '+':
c = *s++;
break;
}
do {
if (!ctype(c, C_DIGIT))
/* not numeric */
return (0);
if (num.u > 214748364U)
/* overflow on multiplication */
return (0);
num.u = num.u * 10U + (unsigned int)ksh_numdig(c);
/* now: num.u <= 2147483649U */
} while ((c = *s++));
if (num.u > (neg ? 2147483648U : 2147483647U))
/* overflow for signed 32-bit int */
return (0);
if (neg)
num.u = -num.u;
*ai = num.i;
return (1);
}
/**
* 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 = strnul(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);
pe = strnul(p);
/*
* isfile is false 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, 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 ?
*/
bool
has_globbing(const char *pat)
{
unsigned char c, subc;
bool saw_glob = false;
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 (false);
/* some specials */
if (ord(c) == ORD('*') || ord(c) == ORD('?')) {
/* easy glob, accept */
saw_glob = true;
} 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 (false);
/* terminating bracket? */
if (ord(c) == ORD(']')) {
/* accept and continue */
p = s;
saw_glob = true;
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 = true;
++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 += utf_ptradj((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, false)))
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, true);
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;
}
return (0);
/* matches zero or once */
case ORD('?') | 0x80:
/* matches one of the patterns */
case ORD('@') | 0x80:
/* simile for @ */
case ORD(' ') | 0x80:
if (!(prest = pat_scan(p, pe, false)))
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, true);
srest = prest == pe ? se : s;
for (; srest <= se; srest++) {
if (do_gmatch(s, srest, psub, pnext - 2, smin) &&
do_gmatch(srest, se, prest, pe, smin))
return (1);
}
if (pnext == prest)
break;
}
return (0);
/* matches none of the patterns */
case ORD('!') | 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, smin)) {
matched = 1;
break;
}
if (pnext == prest)
break;
}
if (!matched &&
do_gmatch(srest, se, prest, pe, smin))
return (1);
}
return (0);
default:
if (sc != p[-1])
return (0);
break;
}
sl = sc;
}
return (s == se);
}
/*XXX this is a prime example for bsearch or a const hashtable */
static const struct cclass {
const char *name;
uint32_t value;
} cclasses[] = {
/* POSIX */
{ "alnum", C_ALNUM },
{ "alpha", C_ALPHA },
{ "blank", C_BLANK },
{ "cntrl", C_CNTRL },
{ "digit", C_DIGIT },
{ "graph", C_GRAPH },
{ "lower", C_LOWER },
{ "print", C_PRINT },
{ "punct", C_PUNCT },
{ "space", C_SPACE },
{ "upper", C_UPPER },
{ "xdigit", C_SEDEC },
/* BSD */
/* "<" and ">" are handled inline */
/* GNU bash */
{ "ascii", C_ASCII },
{ "word", C_ALNUX },
/* mksh */
{ "sh_alias", C_ALIAS },
{ "sh_edq", C_EDQ },
{ "sh_ifs", C_IFS },
{ "sh_ifsws", C_IFSWS },
{ "sh_nl", C_NL },
{ "sh_quote", C_QUOTE },
/* sentinel */
{ NULL, 0 }
};
static const unsigned char *
gmatch_cclass(const unsigned char *pat, unsigned char sc)
{
unsigned char c, subc, lc;
const unsigned char *p = pat, *s;
bool found = false;
bool negated = false;
char *subp;
/* check for negation */
if (ISMAGIC(p[0]) && ord(p[1]) == ORD('!')) {
p += 2;
negated = true;
}
/* make initial ] non-MAGIC */
if (ISMAGIC(p[0]) && ord(p[1]) == ORD(']'))
++p;
/* iterate over bracket expression, debunk()ing on the fly */
while ((c = *p++)) {
nextc:
/* non-regular character? */
if (ISMAGIC(c)) {
/* MAGIC + NUL cannot happen */
if (!(c = *p++))
break;
/* terminating bracket? */
if (ord(c) == ORD(']')) {
/* accept and return */
return (found != negated ? p : NULL);
}
/* sub-bracket expressions */
if (ord(c) == ORD('[') && (
/* collating element? */
ord(*p) == ORD('.') ||
/* equivalence class? */
ord(*p) == ORD('=') ||
/* character class? */
ord(*p) == ORD(':'))) {
/* must stop with exactly the same c */
subc = *p++;
/* save away start of substring */
s = p;