/* $OpenBSD: expr.c,v 1.21 2009/06/01 19:00:57 deraadt Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
* 2011, 2012, 2013
* 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"
__RCSID("$MirOS: src/bin/mksh/expr.c,v 1.61 2013/02/15 18:36:48 tg Exp $");
#if !HAVE_SILENT_IDIVWRAPV
#if !defined(MKSH_LEGACY_MODE) || HAVE_LONG_32BIT
#define IDIVWRAPV_VL (mksh_uari_t)0x80000000UL
#define IDIVWRAPV_VR (mksh_uari_t)0xFFFFFFFFUL
#elif HAVE_LONG_64BIT
#define IDIVWRAPV_VL (mksh_uari_t)0x8000000000000000UL
#define IDIVWRAPV_VR (mksh_uari_t)0xFFFFFFFFFFFFFFFFUL
#else
# warning "cannot guarantee integer division wraparound"
#undef HAVE_SILENT_IDIVWRAPV
#define HAVE_SILENT_IDIVWRAPV 1
#endif
#endif
/* The order of these enums is constrained by the order of opinfo[] */
enum token {
/* some (long) unary operators */
O_PLUSPLUS = 0, O_MINUSMINUS,
/* binary operators */
O_EQ, O_NE,
/* assignments are assumed to be in range O_ASN .. O_BORASN */
O_ASN, O_TIMESASN, O_DIVASN, O_MODASN, O_PLUSASN, O_MINUSASN,
O_LSHIFTASN, O_RSHIFTASN, O_BANDASN, O_BXORASN, O_BORASN,
O_LSHIFT, O_RSHIFT,
O_LE, O_GE, O_LT, O_GT,
O_LAND,
O_LOR,
O_TIMES, O_DIV, O_MOD,
O_PLUS, O_MINUS,
O_BAND,
O_BXOR,
O_BOR,
O_TERN,
O_COMMA,
/* things after this aren't used as binary operators */
/* unary that are not also binaries */
O_BNOT, O_LNOT,
/* misc */
OPEN_PAREN, CLOSE_PAREN, CTERN,
/* things that don't appear in the opinfo[] table */
VAR, LIT, END, BAD
};
#define IS_BINOP(op) (((int)op) >= (int)O_EQ && ((int)op) <= (int)O_COMMA)
#define IS_ASSIGNOP(op) ((int)(op) >= (int)O_ASN && (int)(op) <= (int)O_BORASN)
/* precisions; used to be enum prec but we do arithmetics on it */
#define P_PRIMARY 0 /* VAR, LIT, (), ~ ! - + */
#define P_MULT 1 /* * / % */
#define P_ADD 2 /* + - */
#define P_SHIFT 3 /* << >> */
#define P_RELATION 4 /* < <= > >= */
#define P_EQUALITY 5 /* == != */
#define P_BAND 6 /* & */
#define P_BXOR 7 /* ^ */
#define P_BOR 8 /* | */
#define P_LAND 9 /* && */
#define P_LOR 10 /* || */
#define P_TERN 11 /* ?: */
#define P_ASSIGN 12 /* = *= /= %= += -= <<= >>= &= ^= |= */
#define P_COMMA 13 /* , */
#define MAX_PREC P_COMMA
struct opinfo {
char name[4];
int len; /* name length */
int prec; /* precedence: lower is higher */
};
/* Tokens in this table must be ordered so the longest are first
* (eg, += before +). If you change something, change the order
* of enum token too.
*/
static const struct opinfo opinfo[] = {
{ "++", 2, P_PRIMARY }, /* before + */
{ "--", 2, P_PRIMARY }, /* before - */
{ "==", 2, P_EQUALITY }, /* before = */
{ "!=", 2, P_EQUALITY }, /* before ! */
{ "=", 1, P_ASSIGN }, /* keep assigns in a block */
{ "*=", 2, P_ASSIGN },
{ "/=", 2, P_ASSIGN },
{ "%=", 2, P_ASSIGN },
{ "+=", 2, P_ASSIGN },
{ "-=", 2, P_ASSIGN },
{ "<<=", 3, P_ASSIGN },
{ ">>=", 3, P_ASSIGN },
{ "&=", 2, P_ASSIGN },
{ "^=", 2, P_ASSIGN },
{ "|=", 2, P_ASSIGN },
{ "<<", 2, P_SHIFT },
{ ">>", 2, P_SHIFT },
{ "<=", 2, P_RELATION },
{ ">=", 2, P_RELATION },
{ "<", 1, P_RELATION },
{ ">", 1, P_RELATION },
{ "&&", 2, P_LAND },
{ "||", 2, P_LOR },
{ "*", 1, P_MULT },
{ "/", 1, P_MULT },
{ "%", 1, P_MULT },
{ "+", 1, P_ADD },
{ "-", 1, P_ADD },
{ "&", 1, P_BAND },
{ "^", 1, P_BXOR },
{ "|", 1, P_BOR },
{ "?", 1, P_TERN },
{ ",", 1, P_COMMA },
{ "~", 1, P_PRIMARY },
{ "!", 1, P_PRIMARY },
{ "(", 1, P_PRIMARY },
{ ")", 1, P_PRIMARY },
{ ":", 1, P_PRIMARY },
{ "", 0, P_PRIMARY }
};
typedef struct expr_state {
/* expression being evaluated */
const char *expression;
/* lexical position */
const char *tokp;
/* value from token() */
struct tbl *val;
/* variable that is being recursively expanded (EXPRINEVAL flag set) */
struct tbl *evaling;
/* token from token() */
enum token tok;
/* don't do assignments (for ?:, &&, ||) */
short noassign;
/* evaluating an $(()) expression? */
bool arith;
/* unsigned arithmetic calculation */
bool natural;
} Expr_state;
#define bivui(x, op, y) (es->natural ? \
(mksh_uari_t)((x)->val.u op (y)->val.u) : \
(mksh_uari_t)((x)->val.i op (y)->val.i) \
)
enum error_type {
ET_UNEXPECTED, ET_BADLIT, ET_RECURSIVE,
ET_LVALUE, ET_RDONLY, ET_STR
};
static void evalerr(Expr_state *, enum error_type, const char *)
MKSH_A_NORETURN;
static struct tbl *evalexpr(Expr_state *, int);
static void exprtoken(Expr_state *);
static struct tbl *do_ppmm(Expr_state *, enum token, struct tbl *, bool);
static void assign_check(Expr_state *, enum token, struct tbl *);
static struct tbl *intvar(Expr_state *, struct tbl *);
/*
* parse and evaluate expression
*/
int
evaluate(const char *expr, mksh_ari_t *rval, int error_ok, bool arith)
{
struct tbl v;
int ret;
v.flag = DEFINED|INTEGER;
v.type = 0;
ret = v_evaluate(&v, expr, error_ok, arith);
*rval = v.val.i;
return (ret);
}
/*
* parse and evaluate expression, storing result in vp.
*/
int
v_evaluate(struct tbl *vp, const char *expr, volatile int error_ok,
bool arith)
{
struct tbl *v;
Expr_state curstate;
Expr_state * const es = &curstate;
int i;
/* save state to allow recursive calls */
memset(&curstate, 0, sizeof(curstate));
curstate.expression = curstate.tokp = expr;
curstate.tok = BAD;
curstate.arith = arith;
newenv(E_ERRH);
if ((i = kshsetjmp(e->jbuf))) {
/* Clear EXPRINEVAL in of any variables we were playing with */
if (curstate.evaling)
curstate.evaling->flag &= ~EXPRINEVAL;
quitenv(NULL);
if (i == LAEXPR) {
if (error_ok == KSH_RETURN_ERROR)
return (0);
errorfz();
}
unwind(i);
/* NOTREACHED */
}
exprtoken(es);
if (es->tok == END) {
es->tok = LIT;
es->val = tempvar();
}
v = intvar(es, evalexpr(es, MAX_PREC));
if (es->tok != END)
evalerr(es, ET_UNEXPECTED, NULL);
if (es->arith && es->natural)
vp->flag |= INT_U;
if (vp->flag & INTEGER)
setint_v(vp, v, es->arith);
else
/* can fail if readonly */
setstr(vp, str_val(v), error_ok);
quitenv(NULL);
return (1);
}
static void
evalerr(Expr_state *es, enum error_type type, const char *str)
{
char tbuf[2];
const char *s;
es->arith = false;
switch (type) {
case ET_UNEXPECTED:
switch (es->tok) {
case VAR:
s = es->val->name;
break;
case LIT:
s = str_val(es->val);
break;
case END:
s = "end of expression";
break;
case BAD:
tbuf[0] = *es->tokp;
tbuf[1] = '\0';
s = tbuf;
break;
default:
s = opinfo[(int)es->tok].name;
}
warningf(true, "%s: %s '%s'", es->expression,
"unexpected", s);
break;
case ET_BADLIT:
warningf(true, "%s: %s '%s'", es->expression,
"bad number", str);
break;
case ET_RECURSIVE:
warningf(true, "%s: %s '%s'", es->expression,
"expression recurses on parameter", str);
break;
case ET_LVALUE:
warningf(true, "%s: %s %s",
es->expression, str, "requires lvalue");
break;
case ET_RDONLY:
warningf(true, "%s: %s %s",
es->expression, str, "applied to read-only variable");
break;
default: /* keep gcc happy */
case ET_STR:
warningf(true, "%s: %s", es->expression, str);
break;
}
unwind(LAEXPR);
}
static struct tbl *
evalexpr(Expr_state *es, int prec)
{
struct tbl *vl, *vr = NULL, *vasn;
enum token op;
mksh_uari_t res = 0;
if (prec == P_PRIMARY) {
op = es->tok;
if (op == O_BNOT || op == O_LNOT || op == O_MINUS ||
op == O_PLUS) {
exprtoken(es);
vl = intvar(es, evalexpr(es, P_PRIMARY));
if (op == O_BNOT)
vl->val.i = ~vl->val.i;
else if (op == O_LNOT)
vl->val.i = !vl->val.i;
else if (op == O_MINUS)
vl->val.i = -vl->val.i;
/* op == O_PLUS is a no-op */
} else if (op == OPEN_PAREN) {
exprtoken(es);
vl = evalexpr(es, MAX_PREC);
if (es->tok != CLOSE_PAREN)
evalerr(es, ET_STR, "missing )");
exprtoken(es);
} else if (op == O_PLUSPLUS || op == O_MINUSMINUS) {
exprtoken(es);
vl = do_ppmm(es, op, es->val, true);
exprtoken(es);
} else if (op == VAR || op == LIT) {
vl = es->val;
exprtoken(es);
} else {
evalerr(es, ET_UNEXPECTED, NULL);
/* NOTREACHED */
}
if (es->tok == O_PLUSPLUS || es->tok == O_MINUSMINUS) {
vl = do_ppmm(es, es->tok, vl, false);
exprtoken(es);
}
return (vl);
}
vl = evalexpr(es, prec - 1);
for (op = es->tok; IS_BINOP(op) && opinfo[(int)op].prec == prec;
op = es->tok) {
exprtoken(es);
vasn = vl;
if (op != O_ASN)
/* vl may not have a value yet */
vl = intvar(es, vl);
if (IS_ASSIGNOP(op)) {
if (!es->noassign)
assign_check(es, op, vasn);
vr = intvar(es, evalexpr(es, P_ASSIGN));
} else if (op != O_TERN && op != O_LAND && op != O_LOR)
vr = intvar(es, evalexpr(es, prec - 1));
if ((op == O_DIV || op == O_MOD || op == O_DIVASN ||
op == O_MODASN) && vr->val.i == 0) {
if (es->noassign)
vr->val.i = 1;
else
evalerr(es, ET_STR, "zero divisor");
}
switch ((int)op) {
case O_TIMES:
case O_TIMESASN:
res = bivui(vl, *, vr);
break;
case O_DIV:
case O_DIVASN:
#if !HAVE_SILENT_IDIVWRAPV
/*
* we are doing the comparisons here for the
* signed arithmetics (!es->natural) case,
* but the exact value checks and the bypass
* case assignments are done unsignedly as
* several compilers bitch around otherwise
*/
if (!es->natural &&
vl->val.u == IDIVWRAPV_VL &&
vr->val.u == IDIVWRAPV_VR) {
/* -2147483648 / -1 = 2147483648 */
/* this ^ is really (1 << 31) though */
res = IDIVWRAPV_VL;
} else
#endif
res = bivui(vl, /, vr);
break;
case O_MOD:
case O_MODASN:
#if !HAVE_SILENT_IDIVWRAPV
/* see O_DIV / O_DIVASN for the reason behind this */
if (!es->natural &&
vl->val.u == IDIVWRAPV_VL &&
vr->val.u == IDIVWRAPV_VR) {
/* -2147483648 % -1 = 0 */
res = 0;
} else
#endif
res = bivui(vl, %, vr);
break;
case O_PLUS:
case O_PLUSASN:
res = bivui(vl, +, vr);
break;
case O_MINUS:
case O_MINUSASN:
res = bivui(vl, -, vr);
break;
case O_LSHIFT:
case O_LSHIFTASN:
res = bivui(vl, <<, vr);
break;
case O_RSHIFT:
case O_RSHIFTASN:
res = bivui(vl, >>, vr);
break;
case O_LT:
res = bivui(vl, <, vr);
break;
case O_LE:
res = bivui(vl, <=, vr);
break;
case O_GT:
res = bivui(vl, >, vr);
break;
case O_GE:
res = bivui(vl, >=, vr);
break;
case O_EQ:
res = bivui(vl, ==, vr);
break;
case O_NE:
res = bivui(vl, !=, vr);
break;
case O_BAND:
case O_BANDASN:
res = bivui(vl, &, vr);
break;
case O_BXOR:
case O_BXORASN:
res = bivui(vl, ^, vr);
break;
case O_BOR:
case O_BORASN:
res = bivui(vl, |, vr);
break;
case O_LAND:
if (!vl->val.i)
es->noassign++;
vr = intvar(es, evalexpr(es, prec - 1));
res = bivui(vl, &&, vr);
if (!vl->val.i)
es->noassign--;
break;
case O_LOR:
if (vl->val.i)
es->noassign++;
vr = intvar(es, evalexpr(es, prec - 1));
res = bivui(vl, ||, vr);
if (vl->val.i)
es->noassign--;
break;
case O_TERN:
{
bool ev = vl->val.i != 0;
if (!ev)
es->noassign++;
vl = evalexpr(es, MAX_PREC);
if (!ev)
es->noassign--;
if (es->tok != CTERN)
evalerr(es, ET_STR, "missing :");
exprtoken(es);
if (ev)
es->noassign++;
vr = evalexpr(es, P_TERN);
if (ev)
es->noassign--;
vl = ev ? vl : vr;
}
break;
case O_ASN:
res = vr->val.u;
break;
case O_COMMA:
res = vr->val.u;
break;
}
if (IS_ASSIGNOP(op)) {
vr->val.u = res;
if (!es->noassign) {
if (vasn->flag & INTEGER)
setint_v(vasn, vr, es->arith);
else
setint(vasn, (mksh_ari_t)res);
}
vl = vr;
} else if (op != O_TERN)
vl->val.u = res;
}
return (vl);
}
static void
exprtoken(Expr_state *es)
{
const char *cp = es->tokp;
int c;
char *tvar;
/* skip white space */
skip_spaces:
while ((c = *cp), ksh_isspace(c))
++cp;
if (es->tokp == es->expression && c == '#') {
/* expression begins with # */
es->natural = true; /* switch to unsigned */
++cp;
goto skip_spaces;
}
es->tokp = cp;
if (c == '\0')
es->tok = END;
else if (ksh_isalphx(c)) {
for (; ksh_isalnux(c); c = *cp)
cp++;
if (c == '[') {
size_t len;
len = array_ref_len(cp);
if (len == 0)
evalerr(es, ET_STR, "missing ]");
cp += len;
} else if (c == '(' /*)*/ ) {
/* todo: add math functions (all take single argument):
* abs acos asin atan cos cosh exp int log sin sinh sqrt
* tan tanh
*/
;
}
if (es->noassign) {
es->val = tempvar();
es->val->flag |= EXPRLVALUE;
} else {
strndupx(tvar, es->tokp, cp - es->tokp, ATEMP);
es->val = global(tvar);
afree(tvar, ATEMP);
}
es->tok = VAR;
} else if (c == '1' && cp[1] == '#') {
cp += 2;
cp += utf_ptradj(cp);
strndupx(tvar, es->tokp, cp - es->tokp, ATEMP);
goto process_tvar;
#ifndef MKSH_SMALL
} else if (c == '\'') {
++cp;
cp += utf_ptradj(cp);
if (*cp++ != '\'')
evalerr(es, ET_STR,
"multi-character character constant");
/* 'x' -> 1#x (x = one multibyte character) */
c = cp - es->tokp;
tvar = alloc(c + /* NUL */ 1, ATEMP);
tvar[0] = '1';
tvar[1] = '#';
memcpy(tvar + 2, es->tokp + 1, c - 2);
tvar[c] = '\0';
goto process_tvar;
#endif
} else if (ksh_isdigit(c)) {
while (c != '_' && (ksh_isalnux(c) || c == '#'))
c = *cp++;
strndupx(tvar, es->tokp, --cp - es->tokp, ATEMP);
process_tvar:
es->val = tempvar();
es->val->flag &= ~INTEGER;
es->val->type = 0;
es->val->val.s = tvar;
if (setint_v(es->val, es->val, es->arith) == NULL)
evalerr(es, ET_BADLIT, tvar);
afree(tvar, ATEMP);
es->tok = LIT;
} else {
int i, n0;
for (i = 0; (n0 = opinfo[i].name[0]); i++)
if (c == n0 && strncmp(cp, opinfo[i].name,
(size_t)opinfo[i].len) == 0) {
es->tok = (enum token)i;
cp += opinfo[i].len;
break;
}
if (!n0)
es->tok = BAD;
}
es->tokp = cp;
}
/* Do a ++ or -- operation */
static struct tbl *
do_ppmm(Expr_state *es, enum token op, struct tbl *vasn, bool is_prefix)
{
struct tbl *vl;
mksh_ari_t oval;
assign_check(es, op, vasn);
vl = intvar(es, vasn);
oval = vl->val.i;
if (op == O_PLUSPLUS) {
if (es->natural)
++vl->val.u;
else
++vl->val.i;
} else {
if (es->natural)
--vl->val.u;
else
--vl->val.i;
}
if (vasn->flag & INTEGER)
setint_v(vasn, vl, es->arith);
else
setint(vasn, vl->val.i);
if (!is_prefix)
/* undo the increment/decrement */
vl->val.i = oval;
return (vl);
}
static void
assign_check(Expr_state *es, enum token op, struct tbl *vasn)
{
if (es->tok == END || !vasn ||
(vasn->name[0] == '\0' && !(vasn->flag & EXPRLVALUE)))
evalerr(es, ET_LVALUE, opinfo[(int)op].name);
else if (vasn->flag & RDONLY)
evalerr(es, ET_RDONLY, opinfo[(int)op].name);
}
struct tbl *
tempvar(void)
{
struct tbl *vp;
vp = alloc(sizeof(struct tbl), ATEMP);
vp->flag = ISSET|INTEGER;
vp->type = 0;
vp->areap = ATEMP;
vp->ua.hval = 0;
vp->val.i = 0;
vp->name[0] = '\0';
return (vp);
}
/* cast (string) variable to temporary integer variable */
static struct tbl *
intvar(Expr_state *es, struct tbl *vp)
{
struct tbl *vq;
/* try to avoid replacing a temp var with another temp var */
if (vp->name[0] == '\0' &&
(vp->flag & (ISSET|INTEGER|EXPRLVALUE)) == (ISSET|INTEGER))
return (vp);
vq = tempvar();
if (setint_v(vq, vp, es->arith) == NULL) {
if (vp->flag & EXPRINEVAL)
evalerr(es, ET_RECURSIVE, vp->name);
es->evaling = vp;
vp->flag |= EXPRINEVAL;
v_evaluate(vq, str_val(vp), KSH_UNWIND_ERROR, es->arith);
vp->flag &= ~EXPRINEVAL;
es->evaling = NULL;
}
return (vq);
}
/*
* UTF-8 support code: high-level functions
*/
int
utf_widthadj(const char *src, const char **dst)
{
size_t len;
unsigned int wc;
int width;
if (!UTFMODE || (len = utf_mbtowc(&wc, src)) == (size_t)-1 ||
wc == 0)
len = width = 1;
else if ((width = utf_wcwidth(wc)) < 0)
/* XXX use 2 for x_zotc3 here? */
width = 1;
if (dst)
*dst = src + len;
return (width);
}
size_t
utf_mbswidth(const char *s)
{
size_t len, width = 0;
unsigned int wc;
int cw;
if (!UTFMODE)
return (strlen(s));
while (*s)
if (((len = utf_mbtowc(&wc, s)) == (size_t)-1) ||
((cw = utf_wcwidth(wc)) == -1)) {
s++;
width += 1;
} else {
s += len;
width += cw;
}
return (width);
}
const char *
utf_skipcols(const char *p, int cols)
{
int c = 0;
while (c < cols) {
if (!*p)
return (p + cols - c);
c += utf_widthadj(p, &p);
}
return (p);
}
size_t
utf_ptradj(const char *src)
{
register size_t n;
if (!UTFMODE ||
*(const unsigned char *)(src) < 0xC2 ||
(n = utf_mbtowc(NULL, src)) == (size_t)-1)
n = 1;
return (n);
}
/*
* UTF-8 support code: low-level functions
*/
/* CESU-8 multibyte and wide character conversion crafted for mksh */
size_t
utf_mbtowc(unsigned int *dst, const char *src)
{
const unsigned char *s = (const unsigned char *)src;
unsigned int c, wc;
if ((wc = *s++) < 0x80) {
out:
if (dst != NULL)
*dst = wc;
return (wc ? ((const char *)s - src) : 0);
}
if (wc < 0xC2 || wc >= 0xF0)
/* < 0xC0: spurious second byte */
/* < 0xC2: non-minimalistic mapping error in 2-byte seqs */
/* > 0xEF: beyond BMP */
goto ilseq;
if (wc < 0xE0) {
wc = (wc & 0x1F) << 6;
if (((c = *s++) & 0xC0) != 0x80)
goto ilseq;
wc |= c & 0x3F;
goto out;
}
wc = (wc & 0x0F) << 12;
if (((c = *s++) & 0xC0) != 0x80)
goto ilseq;
wc |= (c & 0x3F) << 6;
if (((c = *s++) & 0xC0) != 0x80)
goto ilseq;
wc |= c & 0x3F;
/* Check for non-minimalistic mapping error in 3-byte seqs */
if (wc >= 0x0800 && wc <= 0xFFFD)
goto out;
ilseq:
return ((size_t)(-1));
}
size_t
utf_wctomb(char *dst, unsigned int wc)
{
unsigned char *d;
if (wc < 0x80) {
*dst = wc;
return (1);
}
d = (unsigned char *)dst;
if (wc < 0x0800)
*d++ = (wc >> 6) | 0xC0;
else {
*d++ = ((wc = wc > 0xFFFD ? 0xFFFD : wc) >> 12) | 0xE0;
*d++ = ((wc >> 6) & 0x3F) | 0x80;
}
*d++ = (wc & 0x3F) | 0x80;
return ((char *)d - dst);
}
#ifndef MKSH_mirbsd_wcwidth
/* --- begin of wcwidth.c excerpt --- */
/*-
* Markus Kuhn -- 2007-05-26 (Unicode 5.0)
*
* Permission to use, copy, modify, and distribute this software
* for any purpose and without fee is hereby granted. The author
* disclaims all warranties with regard to this software.
*/
__RCSID("$miros: src/lib/libc/i18n/wcwidth.c,v 1.11 2012/09/01 23:46:43 tg Exp $");
int
utf_wcwidth(unsigned int c)
{
static const struct cbset {
unsigned short first;
unsigned short last;
} comb[] = {
/* Unicode 6.1.0 BMP */
{ 0x0300, 0x036F }, { 0x0483, 0x0489 }, { 0x0591, 0x05BD },
{ 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, { 0x05C4, 0x05C5 },
{ 0x05C7, 0x05C7 }, { 0x0600, 0x0604 }, { 0x0610, 0x061A },
{ 0x064B, 0x065F }, { 0x0670, 0x0670 }, { 0x06D6, 0x06DD },
{ 0x06DF, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
{ 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
{ 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0816, 0x0819 },
{ 0x081B, 0x0823 }, { 0x0825, 0x0827 }, { 0x0829, 0x082D },
{ 0x0859, 0x085B }, { 0x08E4, 0x08FE }, { 0x0900, 0x0902 },
{ 0x093A, 0x093A }, { 0x093C, 0x093C }, { 0x0941, 0x0948 },
{ 0x094D, 0x094D }, { 0x0951, 0x0957 }, { 0x0962, 0x0963 },
{ 0x0981, 0x0981 }, { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 },
{ 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 },
{ 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 },
{ 0x0A4B, 0x0A4D }, { 0x0A51, 0x0A51 }, { 0x0A70, 0x0A71 },
{ 0x0A75, 0x0A75 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
{ 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
{ 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
{ 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B44 }, { 0x0B4D, 0x0B4D },
{ 0x0B56, 0x0B56 }, { 0x0B62, 0x0B63 }, { 0x0B82, 0x0B82 },
{ 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
{ 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
{ 0x0C62, 0x0C63 }, { 0x0CBC, 0x0CBC }, { 0x0CBF, 0x0CBF },
{ 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD }, { 0x0CE2, 0x0CE3 },
{ 0x0D41, 0x0D44 }, { 0x0D4D, 0x0D4D }, { 0x0D62, 0x0D63 },
{ 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
{ 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
{ 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
{ 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
{ 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
{ 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F8D, 0x0F97 },
{ 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
{ 0x1032, 0x1037 }, { 0x1039, 0x103A }, { 0x103D, 0x103E },
{ 0x1058, 0x1059 }, { 0x105E, 0x1060 }, { 0x1071, 0x1074 },
{ 0x1082, 0x1082 }, { 0x1085, 0x1086 }, { 0x108D, 0x108D },
{ 0x109D, 0x109D }, { 0x1160, 0x11FF }, { 0x135D, 0x135F },
{ 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
{ 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
{ 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
{ 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
{ 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
{ 0x1A17, 0x1A18 }, { 0x1A56, 0x1A56 }, { 0x1A58, 0x1A5E },
{ 0x1A60, 0x1A60 }, { 0x1A62, 0x1A62 }, { 0x1A65, 0x1A6C },
{ 0x1A73, 0x1A7C }, { 0x1A7F, 0x1A7F }, { 0x1B00, 0x1B03 },
{ 0x1B34, 0x1B34 }, { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C },
{ 0x1B42, 0x1B42 }, { 0x1B6B, 0x1B73 }, { 0x1B80, 0x1B81 },
{ 0x1BA2, 0x1BA5 }, { 0x1BA8, 0x1BA9 }, { 0x1BAB, 0x1BAB },
{ 0x1BE6, 0x1BE6 }, { 0x1BE8, 0x1BE9 }, { 0x1BED, 0x1BED },
{ 0x1BEF, 0x1BF1 }, { 0x1C2C, 0x1C33 }, { 0x1C36, 0x1C37 },
{ 0x1CD0, 0x1CD2 }, { 0x1CD4, 0x1CE0 }, { 0x1CE2, 0x1CE8 },
{ 0x1CED, 0x1CED }, { 0x1CF4, 0x1CF4 }, { 0x1DC0, 0x1DE6 },
{ 0x1DFC, 0x1DFF }, { 0x200B, 0x200F }, { 0x202A, 0x202E },
{ 0x2060, 0x2064 }, { 0x206A, 0x206F }, { 0x20D0, 0x20F0 },
{ 0x2CEF, 0x2CF1 }, { 0x2D7F, 0x2D7F }, { 0x2DE0, 0x2DFF },
{ 0x302A, 0x302D }, { 0x3099, 0x309A }, { 0xA66F, 0xA672 },
{ 0xA674, 0xA67D }, { 0xA69F, 0xA69F }, { 0xA6F0, 0xA6F1 },
{ 0xA802, 0xA802 }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
{ 0xA825, 0xA826 }, { 0xA8C4, 0xA8C4 }, { 0xA8E0, 0xA8F1 },
{ 0xA926, 0xA92D }, { 0xA947, 0xA951 }, { 0xA980, 0xA982 },
{ 0xA9B3, 0xA9B3 }, { 0xA9B6, 0xA9B9 }, { 0xA9BC, 0xA9BC },
{ 0xAA29, 0xAA2E }, { 0xAA31, 0xAA32 }, { 0xAA35, 0xAA36 },
{ 0xAA43, 0xAA43 }, { 0xAA4C, 0xAA4C }, { 0xAAB0, 0xAAB0 },
{ 0xAAB2, 0xAAB4 }, { 0xAAB7, 0xAAB8 }, { 0xAABE, 0xAABF },
{ 0xAAC1, 0xAAC1 }, { 0xAAEC, 0xAAED }, { 0xAAF6, 0xAAF6 },
{ 0xABE5, 0xABE5 }, { 0xABE8, 0xABE8 }, { 0xABED, 0xABED },
{ 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F }, { 0xFE20, 0xFE26 },
{ 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB }
};
size_t min = 0, mid, max = NELEM(comb) - 1;
/* test for 8-bit control characters */
if (c < 32 || (c >= 0x7F && c < 0xA0))
return (c ? -1 : 0);
/* binary search in table of non-spacing characters */
if (c >= comb[0].first && c <= comb[max].last)
while (max >= min) {
mid = (min + max) / 2;
if (c > comb[mid].last)
min = mid + 1;
else if (c < comb[mid].first)
max = mid - 1;
else
return (0);
}
/* if we arrive here, c is not a combining or C0/C1 control char */
return ((c >= 0x1100 && (
c <= 0x115F || /* Hangul Jamo init. consonants */
c == 0x2329 || c == 0x232A ||
(c >= 0x2E80 && c <= 0xA4CF && c != 0x303F) || /* CJK ... Yi */
(c >= 0xAC00 && c <= 0xD7A3) || /* Hangul Syllables */
(c >= 0xF900 && c <= 0xFAFF) || /* CJK Compatibility Ideographs */
(c >= 0xFE10 && c <= 0xFE19) || /* Vertical forms */
(c >= 0xFE30 && c <= 0xFE6F) || /* CJK Compatibility Forms */
(c >= 0xFF00 && c <= 0xFF60) || /* Fullwidth Forms */
(c >= 0xFFE0 && c <= 0xFFE6))) ? 2 : 1);
}
/* --- end of wcwidth.c excerpt --- */
#endif
/*
* Wrapper around access(2) because it says root can execute everything
* on some operating systems. Does not set errno, no user needs it. Use
* this iff mode can have the X_OK bit set, access otherwise.
*/
int
ksh_access(const char *fn, int mode)
{
int rv;
struct stat sb;
if ((rv = access(fn, mode)) == 0 && kshuid == 0 && (mode & X_OK) &&
(rv = stat(fn, &sb)) == 0 && !S_ISDIR(sb.st_mode) &&
(sb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)
rv = -1;
return (rv);
}