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eval.c
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/* $OpenBSD: eval.c,v 1.40 2013/09/14 20:09:30 millert Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
* 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
* mirabilos <[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"
__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.219 2018/01/14 01:29:47 tg Exp $");
/*
* string expansion
*
* first pass: quoting, IFS separation, ~, ${}, $() and $(()) substitution.
* second pass: alternation ({,}), filename expansion (*?[]).
*/
/* expansion generator state */
typedef struct {
/* not including an "int type;" member, see expand() */
/* string */
const char *str;
/* source */
union {
/* string[] */
const char **strv;
/* file */
struct shf *shf;
} u;
/* variable in ${var...} */
struct tbl *var;
/* split "$@" / call waitlast in $() */
bool split;
} Expand;
#define XBASE 0 /* scanning original */
#define XSUB 1 /* expanding ${} string */
#define XARGSEP 2 /* ifs0 between "$*" */
#define XARG 3 /* expanding $*, $@ */
#define XCOM 4 /* expanding $() */
#define XNULLSUB 5 /* "$@" when $# is 0 (don't generate word) */
#define XSUBMID 6 /* middle of expanding ${} */
/* States used for field splitting */
#define IFS_WORD 0 /* word has chars (or quotes except "$@") */
#define IFS_WS 1 /* have seen IFS white-space */
#define IFS_NWS 2 /* have seen IFS non-white-space */
#define IFS_IWS 3 /* beginning of word, ignore IFS WS */
#define IFS_QUOTE 4 /* beg.w/quote, become IFS_WORD unless "$@" */
#define STYPE_CHAR 0xFF
#define STYPE_DBL 0x100
#define STYPE_AT 0x200
#define STYPE_SINGLE 0x2FF
#define STYPE_MASK 0x300
static int varsub(Expand *, const char *, const char *, int *, int *);
static int comsub(Expand *, const char *, int);
static char *valsub(struct op *, Area *);
static char *trimsub(char *, char *, int);
static void glob(char *, XPtrV *, bool);
static void globit(XString *, char **, char *, XPtrV *, int);
static const char *maybe_expand_tilde(const char *, XString *, char **, bool);
#ifndef MKSH_NOPWNAM
static char *homedir(char *);
#endif
static void alt_expand(XPtrV *, char *, char *, char *, int);
static int utflen(const char *) MKSH_A_PURE;
static void utfincptr(const char *, mksh_ari_t *);
/* UTFMODE functions */
static int
utflen(const char *s)
{
size_t n;
if (UTFMODE) {
n = 0;
while (*s) {
s += utf_ptradj(s);
++n;
}
} else
n = strlen(s);
if (n > 2147483647)
n = 2147483647;
return ((int)n);
}
static void
utfincptr(const char *s, mksh_ari_t *lp)
{
const char *cp = s;
while ((*lp)--)
cp += utf_ptradj(cp);
*lp = cp - s;
}
/* compile and expand word */
char *
substitute(const char *cp, int f)
{
struct source *s, *sold;
sold = source;
s = pushs(SWSTR, ATEMP);
s->start = s->str = cp;
source = s;
if (yylex(ONEWORD) != LWORD)
internal_errorf(Tbadsubst);
source = sold;
afree(s, ATEMP);
return (evalstr(yylval.cp, f));
}
/*
* expand arg-list
*/
char **
eval(const char **ap, int f)
{
XPtrV w;
if (*ap == NULL) {
union mksh_ccphack vap;
vap.ro = ap;
return (vap.rw);
}
XPinit(w, 32);
/* space for shell name */
XPput(w, NULL);
while (*ap != NULL)
expand(*ap++, &w, f);
XPput(w, NULL);
return ((char **)XPclose(w) + 1);
}
/*
* expand string
*/
char *
evalstr(const char *cp, int f)
{
XPtrV w;
char *dp = null;
XPinit(w, 1);
expand(cp, &w, f);
if (XPsize(w))
dp = *XPptrv(w);
XPfree(w);
return (dp);
}
/*
* expand string - return only one component
* used from iosetup to expand redirection files
*/
char *
evalonestr(const char *cp, int f)
{
XPtrV w;
char *rv;
XPinit(w, 1);
expand(cp, &w, f);
switch (XPsize(w)) {
case 0:
rv = null;
break;
case 1:
rv = (char *) *XPptrv(w);
break;
default:
rv = evalstr(cp, f & ~DOGLOB);
break;
}
XPfree(w);
return (rv);
}
/* for nested substitution: ${var:=$var2} */
typedef struct SubType {
struct tbl *var; /* variable for ${var..} */
struct SubType *prev; /* old type */
struct SubType *next; /* poped type (to avoid re-allocating) */
size_t base; /* start position of expanded word */
short stype; /* [=+-?%#] action after expanded word */
short f; /* saved value of f (DOPAT, etc) */
uint8_t quotep; /* saved value of quote (for ${..[%#]..}) */
uint8_t quotew; /* saved value of quote (for ${..[+-=]..}) */
} SubType;
void
expand(
/* input word */
const char *ccp,
/* output words */
XPtrV *wp,
/* DO* flags */
int f)
{
int c = 0;
/* expansion type */
int type;
/* quoted */
int quote = 0;
/* destination string and live pointer */
XString ds;
char *dp;
/* source */
const char *sp;
/* second pass flags */
int fdo;
/* have word */
int word;
/* field splitting of parameter/command substitution */
int doblank;
/* expansion variables */
Expand x = {
NULL, { NULL }, NULL, 0
};
SubType st_head, *st;
/* record number of trailing newlines in COMSUB */
int newlines = 0;
bool saw_eq, make_magic;
unsigned int tilde_ok;
size_t len;
char *cp;
if (ccp == NULL)
internal_errorf("expand(NULL)");
/* for alias, readonly, set, typeset commands */
if ((f & DOVACHECK) && is_wdvarassign(ccp)) {
f &= ~(DOVACHECK | DOBLANK | DOGLOB | DOTILDE);
f |= DOASNTILDE | DOSCALAR;
}
if (Flag(FNOGLOB))
f &= ~DOGLOB;
if (Flag(FMARKDIRS))
f |= DOMARKDIRS;
if (Flag(FBRACEEXPAND) && (f & DOGLOB))
f |= DOBRACE;
/* init destination string */
Xinit(ds, dp, 128, ATEMP);
type = XBASE;
sp = ccp;
fdo = 0;
saw_eq = false;
/* must be 1/0 */
tilde_ok = (f & (DOTILDE | DOASNTILDE)) ? 1 : 0;
doblank = 0;
make_magic = false;
word = (f&DOBLANK) ? IFS_WS : IFS_WORD;
/* clang doesn't know OSUBST comes before CSUBST */
memset(&st_head, 0, sizeof(st_head));
st = &st_head;
while (/* CONSTCOND */ 1) {
Xcheck(ds, dp);
switch (type) {
case XBASE:
/* original prefixed string */
c = ord(*sp++);
switch (c) {
case EOS:
c = 0;
break;
case CHAR:
c = ord(*sp++);
break;
case QCHAR:
/* temporary quote */
quote |= 2;
c = ord(*sp++);
break;
case OQUOTE:
if (word != IFS_WORD)
word = IFS_QUOTE;
tilde_ok = 0;
quote = 1;
continue;
case CQUOTE:
if (word == IFS_QUOTE)
word = IFS_WORD;
quote = st->quotew;
continue;
case COMASUB:
case COMSUB:
case FUNASUB:
case FUNSUB:
case VALSUB:
tilde_ok = 0;
if (f & DONTRUNCOMMAND) {
word = IFS_WORD;
*dp++ = '$';
switch (c) {
case COMASUB:
case COMSUB:
*dp++ = '(';
c = ORD(')');
break;
case FUNASUB:
case FUNSUB:
case VALSUB:
*dp++ = '{';
*dp++ = c == VALSUB ? '|' : ' ';
c = ORD('}');
break;
}
while (*sp != '\0') {
Xcheck(ds, dp);
*dp++ = *sp++;
}
if ((unsigned int)c == ORD('}'))
*dp++ = ';';
*dp++ = c;
} else {
type = comsub(&x, sp, c);
if (type != XBASE && (f & DOBLANK))
doblank++;
sp = strnul(sp) + 1;
newlines = 0;
}
continue;
case EXPRSUB:
tilde_ok = 0;
if (f & DONTRUNCOMMAND) {
word = IFS_WORD;
*dp++ = '$'; *dp++ = '('; *dp++ = '(';
while (*sp != '\0') {
Xcheck(ds, dp);
*dp++ = *sp++;
}
*dp++ = ')'; *dp++ = ')';
} else {
struct tbl v;
v.flag = DEFINED|ISSET|INTEGER;
/* not default */
v.type = 10;
v.name[0] = '\0';
v_evaluate(&v, substitute(sp, 0),
KSH_UNWIND_ERROR, true);
sp = strnul(sp) + 1;
x.str = str_val(&v);
type = XSUB;
if (f & DOBLANK)
doblank++;
}
continue;
case OSUBST: {
/* ${{#}var{:}[=+-?#%]word} */
/*-
* format is:
* OSUBST [{x] plain-variable-part \0
* compiled-word-part CSUBST [}x]
* This is where all syntax checking gets done...
*/
/* skip the { or x (}) */
const char *varname = ++sp;
int stype;
int slen = 0;
/* skip variable */
sp = cstrchr(sp, '\0') + 1;
type = varsub(&x, varname, sp, &stype, &slen);
if (type < 0) {
char *beg, *end, *str;
unwind_substsyn:
/* restore sp */
sp = varname - 2;
beg = wdcopy(sp, ATEMP);
end = (wdscan(cstrchr(sp, '\0') + 1,
CSUBST) - sp) + beg;
/* ({) the } or x is already skipped */
if (end < wdscan(beg, EOS))
*end = EOS;
str = snptreef(NULL, 64, Tf_S, beg);
afree(beg, ATEMP);
errorf(Tf_sD_s, str, Tbadsubst);
}
if (f & DOBLANK)
doblank++;
tilde_ok = 0;
if (word == IFS_QUOTE && type != XNULLSUB)
word = IFS_WORD;
if (type == XBASE) {
/* expand? */
if (!st->next) {
SubType *newst;
newst = alloc(sizeof(SubType), ATEMP);
newst->next = NULL;
newst->prev = st;
st->next = newst;
}
st = st->next;
st->stype = stype;
st->base = Xsavepos(ds, dp);
st->f = f;
if (x.var == vtemp) {
st->var = tempvar(vtemp->name);
st->var->flag &= ~INTEGER;
/* can't fail here */
setstr(st->var,
str_val(x.var),
KSH_RETURN_ERROR | 0x4);
} else
st->var = x.var;
st->quotew = st->quotep = quote;
/* skip qualifier(s) */
if (stype)
sp += slen;
switch (stype & STYPE_SINGLE) {
case ORD('#') | STYPE_AT:
x.str = shf_smprintf("%08X",
(unsigned int)hash(str_val(st->var)));
break;
case ORD('Q') | STYPE_AT: {
struct shf shf;
shf_sopen(NULL, 0, SHF_WR|SHF_DYNAMIC, &shf);
print_value_quoted(&shf, str_val(st->var));
x.str = shf_sclose(&shf);
break;
}
case ORD('0'): {
char *beg, *mid, *end, *stg;
mksh_ari_t from = 0, num = -1, flen, finc = 0;
beg = wdcopy(sp, ATEMP);
mid = beg + (wdscan(sp, ADELIM) - sp);
stg = beg + (wdscan(sp, CSUBST) - sp);
mid[-2] = EOS;
if (ord(mid[-1]) == ORD(/*{*/ '}')) {
sp += mid - beg - 1;
end = NULL;
} else {
end = mid +
(wdscan(mid, ADELIM) - mid);
if (ord(end[-1]) != ORD(/*{*/ '}'))
/* more than max delimiters */
goto unwind_substsyn;
end[-2] = EOS;
sp += end - beg - 1;
}
evaluate(substitute(stg = wdstrip(beg, 0), 0),
&from, KSH_UNWIND_ERROR, true);
afree(stg, ATEMP);
if (end) {
evaluate(substitute(stg = wdstrip(mid, 0), 0),
&num, KSH_UNWIND_ERROR, true);
afree(stg, ATEMP);
}
afree(beg, ATEMP);
beg = str_val(st->var);
flen = utflen(beg);
if (from < 0) {
if (-from < flen)
finc = flen + from;
} else
finc = from < flen ? from : flen;
if (UTFMODE)
utfincptr(beg, &finc);
beg += finc;
flen = utflen(beg);
if (num < 0 || num > flen)
num = flen;
if (UTFMODE)
utfincptr(beg, &num);
strndupx(x.str, beg, num, ATEMP);
goto do_CSUBST;
}
case ORD('/') | STYPE_AT:
case ORD('/'): {
char *s, *p, *d, *sbeg, *end;
char *pat = NULL, *rrep = null;
char fpat = 0, *tpat1, *tpat2;
char *ws, *wpat, *wrep;
s = ws = wdcopy(sp, ATEMP);
p = s + (wdscan(sp, ADELIM) - sp);
d = s + (wdscan(sp, CSUBST) - sp);
p[-2] = EOS;
if (ord(p[-1]) == ORD(/*{*/ '}'))
d = NULL;
else
d[-2] = EOS;
sp += (d ? d : p) - s - 1;
if (!(stype & STYPE_MASK) &&
s[0] == CHAR &&
ctype(s[1], C_SUB2))
fpat = s[1];
wpat = s + (fpat ? 2 : 0);
wrep = d ? p : NULL;
if (!(stype & STYPE_AT)) {
rrep = wrep ? evalstr(wrep,
DOTILDE | DOSCALAR) :
null;
}
/* prepare string on which to work */
strdupx(s, str_val(st->var), ATEMP);
sbeg = s;
again_search:
pat = evalstr(wpat,
DOTILDE | DOSCALAR | DOPAT);
/* check for special cases */
if (!*pat && !fpat) {
/*
* empty unanchored
* pattern => reject
*/
goto no_repl;
}
if ((stype & STYPE_MASK) &&
gmatchx(null, pat, false)) {
/*
* pattern matches empty
* string => don't loop
*/
stype &= ~STYPE_MASK;
}
/* first see if we have any match at all */
if (ord(fpat) == ORD('#')) {
/* anchor at the beginning */
tpat1 = shf_smprintf("%s%c*", pat, MAGIC);
tpat2 = tpat1;
} else if (ord(fpat) == ORD('%')) {
/* anchor at the end */
tpat1 = shf_smprintf("%c*%s", MAGIC, pat);
tpat2 = pat;
} else {
/* float */
tpat1 = shf_smprintf("%c*%s%c*", MAGIC, pat, MAGIC);
tpat2 = tpat1 + 2;
}
again_repl:
/*
* this would not be necessary if gmatchx would return
* the start and end values of a match found, like re*
*/
if (!gmatchx(sbeg, tpat1, false))
goto end_repl;
end = strnul(s);
/* now anchor the beginning of the match */
if (ord(fpat) != ORD('#'))
while (sbeg <= end) {
if (gmatchx(sbeg, tpat2, false))
break;
else
sbeg++;
}
/* now anchor the end of the match */
p = end;
if (ord(fpat) != ORD('%'))
while (p >= sbeg) {
bool gotmatch;
c = ord(*p);
*p = '\0';
gotmatch = tobool(gmatchx(sbeg, pat, false));
*p = c;
if (gotmatch)
break;
p--;
}
strndupx(end, sbeg, p - sbeg, ATEMP);
record_match(end);
afree(end, ATEMP);
if (stype & STYPE_AT) {
if (rrep != null)
afree(rrep, ATEMP);
rrep = wrep ? evalstr(wrep,
DOTILDE | DOSCALAR) :
null;
}
strndupx(end, s, sbeg - s, ATEMP);
d = shf_smprintf(Tf_sss, end, rrep, p);
afree(end, ATEMP);
sbeg = d + (sbeg - s) + strlen(rrep);
afree(s, ATEMP);
s = d;
if (stype & STYPE_AT) {
afree(tpat1, ATEMP);
afree(pat, ATEMP);
goto again_search;
} else if (stype & STYPE_DBL)
goto again_repl;
end_repl:
afree(tpat1, ATEMP);
x.str = s;
no_repl:
afree(pat, ATEMP);
if (rrep != null)
afree(rrep, ATEMP);
afree(ws, ATEMP);
goto do_CSUBST;
}
case ORD('#'):
case ORD('%'):
/* ! DOBLANK,DOBRACE */
f = (f & DONTRUNCOMMAND) |
DOPAT | DOTILDE |
DOTEMP | DOSCALAR;
tilde_ok = 1;
st->quotew = quote = 0;
/*
* Prepend open pattern (so |
* in a trim will work as
* expected)
*/
if (!Flag(FSH)) {
*dp++ = MAGIC;
*dp++ = ORD(0x80 | '@');
}
break;
case ORD('='):
/*
* Tilde expansion for string
* variables in POSIX mode is
* governed by Austinbug 351.
* In non-POSIX mode historic
* ksh behaviour (enable it!)
* us followed.
* Not doing tilde expansion
* for integer variables is a
* non-POSIX thing - makes
* sense though, since ~ is
* a arithmetic operator.
*/
if (!(x.var->flag & INTEGER))
f |= DOASNTILDE | DOTILDE;
f |= DOTEMP | DOSCALAR;
/*
* These will be done after the
* value has been assigned.
*/
f &= ~(DOBLANK|DOGLOB|DOBRACE);
tilde_ok = 1;
break;
case ORD('?'):
if (*sp == CSUBST)
errorf("%s: parameter null or not set",
st->var->name);
f &= ~DOBLANK;
f |= DOTEMP;
/* FALLTHROUGH */
default:
/* '-' '+' '?' */
if (quote)
word = IFS_WORD;
else if (dp == Xstring(ds, dp))
word = IFS_IWS;
/* Enable tilde expansion */
tilde_ok = 1;
f |= DOTILDE;
}
} else
/* skip word */
sp += wdscan(sp, CSUBST) - sp;
continue;
}
case CSUBST:
/* only get here if expanding word */
do_CSUBST:
/* ({) skip the } or x */
sp++;
/* in case of ${unset:-} */
tilde_ok = 0;
*dp = '\0';
quote = st->quotep;
f = st->f;
if (f & DOBLANK)
doblank--;
switch (st->stype & STYPE_SINGLE) {
case ORD('#'):
case ORD('%'):
if (!Flag(FSH)) {
/* Append end-pattern */
*dp++ = MAGIC;
*dp++ = ')';
}
*dp = '\0';
dp = Xrestpos(ds, dp, st->base);
/*
* Must use st->var since calling
* global would break things
* like x[i+=1].
*/
x.str = trimsub(str_val(st->var),
dp, st->stype);
if (x.str[0] != '\0') {
word = IFS_IWS;
type = XSUB;
} else if (quote) {
word = IFS_WORD;
type = XSUB;
} else {
if (dp == Xstring(ds, dp))
word = IFS_IWS;
type = XNULLSUB;
}
if (f & DOBLANK)
doblank++;
st = st->prev;
continue;
case ORD('='):
/*
* Restore our position and substitute
* the value of st->var (may not be
* the assigned value in the presence
* of integer/right-adj/etc attributes).
*/
dp = Xrestpos(ds, dp, st->base);
/*
* Must use st->var since calling
* global would cause with things
* like x[i+=1] to be evaluated twice.
*/
/*
* Note: not exported by FEXPORT
* in AT&T ksh.
*/
/*
* XXX POSIX says readonly is only
* fatal for special builtins (setstr
* does readonly check).
*/
len = strlen(dp) + 1;
setstr(st->var,
debunk(alloc(len, ATEMP),
dp, len), KSH_UNWIND_ERROR);
x.str = str_val(st->var);
type = XSUB;
if (f & DOBLANK)
doblank++;
st = st->prev;
word = quote || (!*x.str && (f & DOSCALAR)) ? IFS_WORD : IFS_IWS;
continue;
case ORD('?'):
dp = Xrestpos(ds, dp, st->base);
errorf(Tf_sD_s, st->var->name,
debunk(dp, dp, strlen(dp) + 1));
break;
case ORD('0'):
case ORD('/') | STYPE_AT:
case ORD('/'):
case ORD('#') | STYPE_AT:
case ORD('Q') | STYPE_AT:
dp = Xrestpos(ds, dp, st->base);
type = XSUB;
word = quote || (!*x.str && (f & DOSCALAR)) ? IFS_WORD : IFS_IWS;
if (f & DOBLANK)
doblank++;
st = st->prev;
continue;
/* default: '-' '+' */
}
st = st->prev;
type = XBASE;
continue;
case OPAT:
/* open pattern: *(foo|bar) */
/* Next char is the type of pattern */
make_magic = true;
c = ord(*sp++) | 0x80U;
break;
case SPAT:
/* pattern separator (|) */
make_magic = true;
c = ORD('|');
break;
case CPAT:
/* close pattern */
make_magic = true;
c = ORD(/*(*/ ')');
break;
}
break;
case XNULLSUB:
/*
* Special case for "$@" (and "${foo[@]}") - no
* word is generated if $# is 0 (unless there is
* other stuff inside the quotes).
*/
type = XBASE;
if (f & DOBLANK) {
doblank--;
if (dp == Xstring(ds, dp) && word != IFS_WORD)
word = IFS_IWS;
}
continue;
case XSUB:
case XSUBMID:
if ((c = ord(*x.str++)) == 0) {
type = XBASE;
if (f & DOBLANK)
doblank--;
continue;
}
break;
case XARGSEP:
type = XARG;
quote = 1;
/* FALLTHROUGH */
case XARG:
if ((c = ord(*x.str++)) == '\0') {
/*
* force null words to be created so
* set -- "" 2 ""; echo "$@" will do
* the right thing
*/
if (quote && x.split)
word = IFS_WORD;
if ((x.str = *x.u.strv++) == NULL) {
type = XBASE;
if (f & DOBLANK)
doblank--;
continue;
}
c = ord(ifs0);
if ((f & DOHEREDOC)) {
/* pseudo-field-split reliably */
if (c == 0)
c = ORD(' ');
break;
}
if ((f & DOSCALAR)) {
/* do not field-split */
if (x.split) {
c = ORD(' ');
break;
}
if (c == 0)
continue;
}
if (c == 0) {
if (quote && !x.split)
continue;
if (!quote && word == IFS_WS)
continue;
/* this is so we don't terminate */
c = ORD(' ');
/* now force-emit a word */
goto emit_word;
}
if (quote && x.split) {
/* terminate word for "$@" */
type = XARGSEP;
quote = 0;
}
}
break;
case XCOM:
if (x.u.shf == NULL) {
/* $(<...) failed */
subst_exstat = 1;
/* fake EOF */
c = -1;
} else if (newlines) {
/* spit out saved NLs */
c = ORD('\n');
--newlines;
} else {
while ((c = shf_getc(x.u.shf)) == 0 ||
cinttype(c, C_NL)) {
#ifdef MKSH_WITH_TEXTMODE
if (c == ORD('\r')) {
c = shf_getc(x.u.shf);
switch (c) {
case ORD('\n'):
break;
default:
shf_ungetc(c, x.u.shf);
/* FALLTHROUGH */
case -1:
c = ORD('\r');
break;
}
}
#endif
if (c == ORD('\n'))
/* save newlines */
newlines++;
}
if (newlines && c != -1) {
shf_ungetc(c, x.u.shf);
c = ORD('\n');
--newlines;
}
}
if (c == -1) {
newlines = 0;
if (x.u.shf)
shf_close(x.u.shf);
if (x.split)
subst_exstat = waitlast();
type = XBASE;
if (f & DOBLANK)
doblank--;
continue;
}
break;
}
/* check for end of word or IFS separation */
if (c == 0 || (!quote && (f & DOBLANK) && doblank &&
!make_magic && ctype(c, C_IFS))) {
/*-
* How words are broken up:
* | value of c
* word | ws nws 0
* -----------------------------------
* IFS_WORD w/WS w/NWS w
* IFS_WS -/WS -/NWS -
* IFS_NWS -/NWS w/NWS -
* IFS_IWS -/WS w/NWS -
* (w means generate a word)
*/
if ((word == IFS_WORD) || (word == IFS_QUOTE) || (c &&
(word == IFS_IWS || word == IFS_NWS) &&
!ctype(c, C_IFSWS))) {
emit_word:
if (f & DOHERESTR)
*dp++ = '\n';
*dp++ = '\0';
cp = Xclose(ds, dp);
if (fdo & DOBRACE)
/* also does globbing */
alt_expand(wp, cp, cp,
cp + Xlength(ds, (dp - 1)),
fdo | (f & DOMARKDIRS));
else if (fdo & DOGLOB)
glob(cp, wp, tobool(f & DOMARKDIRS));
else if ((f & DOPAT) || !(fdo & DOMAGIC))
XPput(*wp, cp);
else
XPput(*wp, debunk(cp, cp,
strlen(cp) + 1));
fdo = 0;
saw_eq = false;
/* must be 1/0 */
tilde_ok = (f & (DOTILDE | DOASNTILDE)) ? 1 : 0;
if (c == 0)
return;
Xinit(ds, dp, 128, ATEMP);
} else if (c == 0) {
return;
} else if (type == XSUB && ctype(c, C_IFS) &&
!ctype(c, C_IFSWS) && Xlength(ds, dp) == 0) {
*(cp = alloc(1, ATEMP)) = '\0';
XPput(*wp, cp);
type = XSUBMID;
}
if (word != IFS_NWS)
word = ctype(c, C_IFSWS) ? IFS_WS : IFS_NWS;
} else {
if (type == XSUB) {
if (word == IFS_NWS &&
Xlength(ds, dp) == 0) {
*(cp = alloc(1, ATEMP)) = '\0';
XPput(*wp, cp);
}
type = XSUBMID;
}