| 1 |
/* $OpenBSD: eval.c,v 1.40 2013/09/14 20:09:30 millert Exp $ */ |
| 2 |
|
| 3 |
/*- |
| 4 |
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
| 5 |
* 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
| 6 |
* mirabilos <m@mirbsd.org> |
| 7 |
* |
| 8 |
* Provided that these terms and disclaimer and all copyright notices |
| 9 |
* are retained or reproduced in an accompanying document, permission |
| 10 |
* is granted to deal in this work without restriction, including un- |
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* limited rights to use, publicly perform, distribute, sell, modify, |
| 12 |
* merge, give away, or sublicence. |
| 13 |
* |
| 14 |
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to |
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* the utmost extent permitted by applicable law, neither express nor |
| 16 |
* implied; without malicious intent or gross negligence. In no event |
| 17 |
* may a licensor, author or contributor be held liable for indirect, |
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* direct, other damage, loss, or other issues arising in any way out |
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* of dealing in the work, even if advised of the possibility of such |
| 20 |
* damage or existence of a defect, except proven that it results out |
| 21 |
* of said person's immediate fault when using the work as intended. |
| 22 |
*/ |
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|
| 24 |
#include "sh.h" |
| 25 |
|
| 26 |
__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.219 2018/01/14 01:29:47 tg Exp $"); |
| 27 |
|
| 28 |
/* |
| 29 |
* string expansion |
| 30 |
* |
| 31 |
* first pass: quoting, IFS separation, ~, ${}, $() and $(()) substitution. |
| 32 |
* second pass: alternation ({,}), filename expansion (*?[]). |
| 33 |
*/ |
| 34 |
|
| 35 |
/* expansion generator state */ |
| 36 |
typedef struct { |
| 37 |
/* not including an "int type;" member, see expand() */ |
| 38 |
/* string */ |
| 39 |
const char *str; |
| 40 |
/* source */ |
| 41 |
union { |
| 42 |
/* string[] */ |
| 43 |
const char **strv; |
| 44 |
/* file */ |
| 45 |
struct shf *shf; |
| 46 |
} u; |
| 47 |
/* variable in ${var...} */ |
| 48 |
struct tbl *var; |
| 49 |
/* split "$@" / call waitlast in $() */ |
| 50 |
bool split; |
| 51 |
} Expand; |
| 52 |
|
| 53 |
#define XBASE 0 /* scanning original */ |
| 54 |
#define XSUB 1 /* expanding ${} string */ |
| 55 |
#define XARGSEP 2 /* ifs0 between "$*" */ |
| 56 |
#define XARG 3 /* expanding $*, $@ */ |
| 57 |
#define XCOM 4 /* expanding $() */ |
| 58 |
#define XNULLSUB 5 /* "$@" when $# is 0 (don't generate word) */ |
| 59 |
#define XSUBMID 6 /* middle of expanding ${} */ |
| 60 |
|
| 61 |
/* States used for field splitting */ |
| 62 |
#define IFS_WORD 0 /* word has chars (or quotes except "$@") */ |
| 63 |
#define IFS_WS 1 /* have seen IFS white-space */ |
| 64 |
#define IFS_NWS 2 /* have seen IFS non-white-space */ |
| 65 |
#define IFS_IWS 3 /* beginning of word, ignore IFS WS */ |
| 66 |
#define IFS_QUOTE 4 /* beg.w/quote, become IFS_WORD unless "$@" */ |
| 67 |
|
| 68 |
#define STYPE_CHAR 0xFF |
| 69 |
#define STYPE_DBL 0x100 |
| 70 |
#define STYPE_AT 0x200 |
| 71 |
#define STYPE_SINGLE 0x2FF |
| 72 |
#define STYPE_MASK 0x300 |
| 73 |
|
| 74 |
static int varsub(Expand *, const char *, const char *, int *, int *); |
| 75 |
static int comsub(Expand *, const char *, int); |
| 76 |
static char *valsub(struct op *, Area *); |
| 77 |
static char *trimsub(char *, char *, int); |
| 78 |
static void glob(char *, XPtrV *, bool); |
| 79 |
static void globit(XString *, char **, char *, XPtrV *, int); |
| 80 |
static const char *maybe_expand_tilde(const char *, XString *, char **, bool); |
| 81 |
#ifndef MKSH_NOPWNAM |
| 82 |
static char *homedir(char *); |
| 83 |
#endif |
| 84 |
static void alt_expand(XPtrV *, char *, char *, char *, int); |
| 85 |
static int utflen(const char *) MKSH_A_PURE; |
| 86 |
static void utfincptr(const char *, mksh_ari_t *); |
| 87 |
|
| 88 |
/* UTFMODE functions */ |
| 89 |
static int |
| 90 |
utflen(const char *s) |
| 91 |
{ |
| 92 |
size_t n; |
| 93 |
|
| 94 |
if (UTFMODE) { |
| 95 |
n = 0; |
| 96 |
while (*s) { |
| 97 |
s += utf_ptradj(s); |
| 98 |
++n; |
| 99 |
} |
| 100 |
} else |
| 101 |
n = strlen(s); |
| 102 |
|
| 103 |
if (n > 2147483647) |
| 104 |
n = 2147483647; |
| 105 |
return ((int)n); |
| 106 |
} |
| 107 |
|
| 108 |
static void |
| 109 |
utfincptr(const char *s, mksh_ari_t *lp) |
| 110 |
{ |
| 111 |
const char *cp = s; |
| 112 |
|
| 113 |
while ((*lp)--) |
| 114 |
cp += utf_ptradj(cp); |
| 115 |
*lp = cp - s; |
| 116 |
} |
| 117 |
|
| 118 |
/* compile and expand word */ |
| 119 |
char * |
| 120 |
substitute(const char *cp, int f) |
| 121 |
{ |
| 122 |
struct source *s, *sold; |
| 123 |
|
| 124 |
sold = source; |
| 125 |
s = pushs(SWSTR, ATEMP); |
| 126 |
s->start = s->str = cp; |
| 127 |
source = s; |
| 128 |
if (yylex(ONEWORD) != LWORD) |
| 129 |
internal_errorf(Tbadsubst); |
| 130 |
source = sold; |
| 131 |
afree(s, ATEMP); |
| 132 |
return (evalstr(yylval.cp, f)); |
| 133 |
} |
| 134 |
|
| 135 |
/* |
| 136 |
* expand arg-list |
| 137 |
*/ |
| 138 |
char ** |
| 139 |
eval(const char **ap, int f) |
| 140 |
{ |
| 141 |
XPtrV w; |
| 142 |
|
| 143 |
if (*ap == NULL) { |
| 144 |
union mksh_ccphack vap; |
| 145 |
|
| 146 |
vap.ro = ap; |
| 147 |
return (vap.rw); |
| 148 |
} |
| 149 |
XPinit(w, 32); |
| 150 |
/* space for shell name */ |
| 151 |
XPput(w, NULL); |
| 152 |
while (*ap != NULL) |
| 153 |
expand(*ap++, &w, f); |
| 154 |
XPput(w, NULL); |
| 155 |
return ((char **)XPclose(w) + 1); |
| 156 |
} |
| 157 |
|
| 158 |
/* |
| 159 |
* expand string |
| 160 |
*/ |
| 161 |
char * |
| 162 |
evalstr(const char *cp, int f) |
| 163 |
{ |
| 164 |
XPtrV w; |
| 165 |
char *dp = null; |
| 166 |
|
| 167 |
XPinit(w, 1); |
| 168 |
expand(cp, &w, f); |
| 169 |
if (XPsize(w)) |
| 170 |
dp = *XPptrv(w); |
| 171 |
XPfree(w); |
| 172 |
return (dp); |
| 173 |
} |
| 174 |
|
| 175 |
/* |
| 176 |
* expand string - return only one component |
| 177 |
* used from iosetup to expand redirection files |
| 178 |
*/ |
| 179 |
char * |
| 180 |
evalonestr(const char *cp, int f) |
| 181 |
{ |
| 182 |
XPtrV w; |
| 183 |
char *rv; |
| 184 |
|
| 185 |
XPinit(w, 1); |
| 186 |
expand(cp, &w, f); |
| 187 |
switch (XPsize(w)) { |
| 188 |
case 0: |
| 189 |
rv = null; |
| 190 |
break; |
| 191 |
case 1: |
| 192 |
rv = (char *) *XPptrv(w); |
| 193 |
break; |
| 194 |
default: |
| 195 |
rv = evalstr(cp, f & ~DOGLOB); |
| 196 |
break; |
| 197 |
} |
| 198 |
XPfree(w); |
| 199 |
return (rv); |
| 200 |
} |
| 201 |
|
| 202 |
/* for nested substitution: ${var:=$var2} */ |
| 203 |
typedef struct SubType { |
| 204 |
struct tbl *var; /* variable for ${var..} */ |
| 205 |
struct SubType *prev; /* old type */ |
| 206 |
struct SubType *next; /* poped type (to avoid re-allocating) */ |
| 207 |
size_t base; /* start position of expanded word */ |
| 208 |
short stype; /* [=+-?%#] action after expanded word */ |
| 209 |
short f; /* saved value of f (DOPAT, etc) */ |
| 210 |
uint8_t quotep; /* saved value of quote (for ${..[%#]..}) */ |
| 211 |
uint8_t quotew; /* saved value of quote (for ${..[+-=]..}) */ |
| 212 |
} SubType; |
| 213 |
|
| 214 |
void |
| 215 |
expand( |
| 216 |
/* input word */ |
| 217 |
const char *ccp, |
| 218 |
/* output words */ |
| 219 |
XPtrV *wp, |
| 220 |
/* DO* flags */ |
| 221 |
int f) |
| 222 |
{ |
| 223 |
int c = 0; |
| 224 |
/* expansion type */ |
| 225 |
int type; |
| 226 |
/* quoted */ |
| 227 |
int quote = 0; |
| 228 |
/* destination string and live pointer */ |
| 229 |
XString ds; |
| 230 |
char *dp; |
| 231 |
/* source */ |
| 232 |
const char *sp; |
| 233 |
/* second pass flags */ |
| 234 |
int fdo; |
| 235 |
/* have word */ |
| 236 |
int word; |
| 237 |
/* field splitting of parameter/command substitution */ |
| 238 |
int doblank; |
| 239 |
/* expansion variables */ |
| 240 |
Expand x = { |
| 241 |
NULL, { NULL }, NULL, 0 |
| 242 |
}; |
| 243 |
SubType st_head, *st; |
| 244 |
/* record number of trailing newlines in COMSUB */ |
| 245 |
int newlines = 0; |
| 246 |
bool saw_eq, make_magic; |
| 247 |
unsigned int tilde_ok; |
| 248 |
size_t len; |
| 249 |
char *cp; |
| 250 |
|
| 251 |
if (ccp == NULL) |
| 252 |
internal_errorf("expand(NULL)"); |
| 253 |
/* for alias, readonly, set, typeset commands */ |
| 254 |
if ((f & DOVACHECK) && is_wdvarassign(ccp)) { |
| 255 |
f &= ~(DOVACHECK | DOBLANK | DOGLOB | DOTILDE); |
| 256 |
f |= DOASNTILDE | DOSCALAR; |
| 257 |
} |
| 258 |
if (Flag(FNOGLOB)) |
| 259 |
f &= ~DOGLOB; |
| 260 |
if (Flag(FMARKDIRS)) |
| 261 |
f |= DOMARKDIRS; |
| 262 |
if (Flag(FBRACEEXPAND) && (f & DOGLOB)) |
| 263 |
f |= DOBRACE; |
| 264 |
|
| 265 |
/* init destination string */ |
| 266 |
Xinit(ds, dp, 128, ATEMP); |
| 267 |
type = XBASE; |
| 268 |
sp = ccp; |
| 269 |
fdo = 0; |
| 270 |
saw_eq = false; |
| 271 |
/* must be 1/0 */ |
| 272 |
tilde_ok = (f & (DOTILDE | DOASNTILDE)) ? 1 : 0; |
| 273 |
doblank = 0; |
| 274 |
make_magic = false; |
| 275 |
word = (f&DOBLANK) ? IFS_WS : IFS_WORD; |
| 276 |
/* clang doesn't know OSUBST comes before CSUBST */ |
| 277 |
memset(&st_head, 0, sizeof(st_head)); |
| 278 |
st = &st_head; |
| 279 |
|
| 280 |
while (/* CONSTCOND */ 1) { |
| 281 |
Xcheck(ds, dp); |
| 282 |
|
| 283 |
switch (type) { |
| 284 |
case XBASE: |
| 285 |
/* original prefixed string */ |
| 286 |
c = ord(*sp++); |
| 287 |
switch (c) { |
| 288 |
case EOS: |
| 289 |
c = 0; |
| 290 |
break; |
| 291 |
case CHAR: |
| 292 |
c = ord(*sp++); |
| 293 |
break; |
| 294 |
case QCHAR: |
| 295 |
/* temporary quote */ |
| 296 |
quote |= 2; |
| 297 |
c = ord(*sp++); |
| 298 |
break; |
| 299 |
case OQUOTE: |
| 300 |
if (word != IFS_WORD) |
| 301 |
word = IFS_QUOTE; |
| 302 |
tilde_ok = 0; |
| 303 |
quote = 1; |
| 304 |
continue; |
| 305 |
case CQUOTE: |
| 306 |
if (word == IFS_QUOTE) |
| 307 |
word = IFS_WORD; |
| 308 |
quote = st->quotew; |
| 309 |
continue; |
| 310 |
case COMASUB: |
| 311 |
case COMSUB: |
| 312 |
case FUNASUB: |
| 313 |
case FUNSUB: |
| 314 |
case VALSUB: |
| 315 |
tilde_ok = 0; |
| 316 |
if (f & DONTRUNCOMMAND) { |
| 317 |
word = IFS_WORD; |
| 318 |
*dp++ = '$'; |
| 319 |
switch (c) { |
| 320 |
case COMASUB: |
| 321 |
case COMSUB: |
| 322 |
*dp++ = '('; |
| 323 |
c = ORD(')'); |
| 324 |
break; |
| 325 |
case FUNASUB: |
| 326 |
case FUNSUB: |
| 327 |
case VALSUB: |
| 328 |
*dp++ = '{'; |
| 329 |
*dp++ = c == VALSUB ? '|' : ' '; |
| 330 |
c = ORD('}'); |
| 331 |
break; |
| 332 |
} |
| 333 |
while (*sp != '\0') { |
| 334 |
Xcheck(ds, dp); |
| 335 |
*dp++ = *sp++; |
| 336 |
} |
| 337 |
if ((unsigned int)c == ORD('}')) |
| 338 |
*dp++ = ';'; |
| 339 |
*dp++ = c; |
| 340 |
} else { |
| 341 |
type = comsub(&x, sp, c); |
| 342 |
if (type != XBASE && (f & DOBLANK)) |
| 343 |
doblank++; |
| 344 |
sp = strnul(sp) + 1; |
| 345 |
newlines = 0; |
| 346 |
} |
| 347 |
continue; |
| 348 |
case EXPRSUB: |
| 349 |
tilde_ok = 0; |
| 350 |
if (f & DONTRUNCOMMAND) { |
| 351 |
word = IFS_WORD; |
| 352 |
*dp++ = '$'; *dp++ = '('; *dp++ = '('; |
| 353 |
while (*sp != '\0') { |
| 354 |
Xcheck(ds, dp); |
| 355 |
*dp++ = *sp++; |
| 356 |
} |
| 357 |
*dp++ = ')'; *dp++ = ')'; |
| 358 |
} else { |
| 359 |
struct tbl v; |
| 360 |
|
| 361 |
v.flag = DEFINED|ISSET|INTEGER; |
| 362 |
/* not default */ |
| 363 |
v.type = 10; |
| 364 |
v.name[0] = '\0'; |
| 365 |
v_evaluate(&v, substitute(sp, 0), |
| 366 |
KSH_UNWIND_ERROR, true); |
| 367 |
sp = strnul(sp) + 1; |
| 368 |
x.str = str_val(&v); |
| 369 |
type = XSUB; |
| 370 |
if (f & DOBLANK) |
| 371 |
doblank++; |
| 372 |
} |
| 373 |
continue; |
| 374 |
case OSUBST: { |
| 375 |
/* ${{#}var{:}[=+-?#%]word} */ |
| 376 |
/*- |
| 377 |
* format is: |
| 378 |
* OSUBST [{x] plain-variable-part \0 |
| 379 |
* compiled-word-part CSUBST [}x] |
| 380 |
* This is where all syntax checking gets done... |
| 381 |
*/ |
| 382 |
/* skip the { or x (}) */ |
| 383 |
const char *varname = ++sp; |
| 384 |
int stype; |
| 385 |
int slen = 0; |
| 386 |
|
| 387 |
/* skip variable */ |
| 388 |
sp = cstrchr(sp, '\0') + 1; |
| 389 |
type = varsub(&x, varname, sp, &stype, &slen); |
| 390 |
if (type < 0) { |
| 391 |
char *beg, *end, *str; |
| 392 |
unwind_substsyn: |
| 393 |
/* restore sp */ |
| 394 |
sp = varname - 2; |
| 395 |
beg = wdcopy(sp, ATEMP); |
| 396 |
end = (wdscan(cstrchr(sp, '\0') + 1, |
| 397 |
CSUBST) - sp) + beg; |
| 398 |
/* ({) the } or x is already skipped */ |
| 399 |
if (end < wdscan(beg, EOS)) |
| 400 |
*end = EOS; |
| 401 |
str = snptreef(NULL, 64, Tf_S, beg); |
| 402 |
afree(beg, ATEMP); |
| 403 |
errorf(Tf_sD_s, str, Tbadsubst); |
| 404 |
} |
| 405 |
if (f & DOBLANK) |
| 406 |
doblank++; |
| 407 |
tilde_ok = 0; |
| 408 |
if (word == IFS_QUOTE && type != XNULLSUB) |
| 409 |
word = IFS_WORD; |
| 410 |
if (type == XBASE) { |
| 411 |
/* expand? */ |
| 412 |
if (!st->next) { |
| 413 |
SubType *newst; |
| 414 |
|
| 415 |
newst = alloc(sizeof(SubType), ATEMP); |
| 416 |
newst->next = NULL; |
| 417 |
newst->prev = st; |
| 418 |
st->next = newst; |
| 419 |
} |
| 420 |
st = st->next; |
| 421 |
st->stype = stype; |
| 422 |
st->base = Xsavepos(ds, dp); |
| 423 |
st->f = f; |
| 424 |
if (x.var == vtemp) { |
| 425 |
st->var = tempvar(vtemp->name); |
| 426 |
st->var->flag &= ~INTEGER; |
| 427 |
/* can't fail here */ |
| 428 |
setstr(st->var, |
| 429 |
str_val(x.var), |
| 430 |
KSH_RETURN_ERROR | 0x4); |
| 431 |
} else |
| 432 |
st->var = x.var; |
| 433 |
|
| 434 |
st->quotew = st->quotep = quote; |
| 435 |
/* skip qualifier(s) */ |
| 436 |
if (stype) |
| 437 |
sp += slen; |
| 438 |
switch (stype & STYPE_SINGLE) { |
| 439 |
case ORD('#') | STYPE_AT: |
| 440 |
x.str = shf_smprintf("%08X", |
| 441 |
(unsigned int)hash(str_val(st->var))); |
| 442 |
break; |
| 443 |
case ORD('Q') | STYPE_AT: { |
| 444 |
struct shf shf; |
| 445 |
|
| 446 |
shf_sopen(NULL, 0, SHF_WR|SHF_DYNAMIC, &shf); |
| 447 |
print_value_quoted(&shf, str_val(st->var)); |
| 448 |
x.str = shf_sclose(&shf); |
| 449 |
break; |
| 450 |
} |
| 451 |
case ORD('0'): { |
| 452 |
char *beg, *mid, *end, *stg; |
| 453 |
mksh_ari_t from = 0, num = -1, flen, finc = 0; |
| 454 |
|
| 455 |
beg = wdcopy(sp, ATEMP); |
| 456 |
mid = beg + (wdscan(sp, ADELIM) - sp); |
| 457 |
stg = beg + (wdscan(sp, CSUBST) - sp); |
| 458 |
mid[-2] = EOS; |
| 459 |
if (ord(mid[-1]) == ORD(/*{*/ '}')) { |
| 460 |
sp += mid - beg - 1; |
| 461 |
end = NULL; |
| 462 |
} else { |
| 463 |
end = mid + |
| 464 |
(wdscan(mid, ADELIM) - mid); |
| 465 |
if (ord(end[-1]) != ORD(/*{*/ '}')) |
| 466 |
/* more than max delimiters */ |
| 467 |
goto unwind_substsyn; |
| 468 |
end[-2] = EOS; |
| 469 |
sp += end - beg - 1; |
| 470 |
} |
| 471 |
evaluate(substitute(stg = wdstrip(beg, 0), 0), |
| 472 |
&from, KSH_UNWIND_ERROR, true); |
| 473 |
afree(stg, ATEMP); |
| 474 |
if (end) { |
| 475 |
evaluate(substitute(stg = wdstrip(mid, 0), 0), |
| 476 |
&num, KSH_UNWIND_ERROR, true); |
| 477 |
afree(stg, ATEMP); |
| 478 |
} |
| 479 |
afree(beg, ATEMP); |
| 480 |
beg = str_val(st->var); |
| 481 |
flen = utflen(beg); |
| 482 |
if (from < 0) { |
| 483 |
if (-from < flen) |
| 484 |
finc = flen + from; |
| 485 |
} else |
| 486 |
finc = from < flen ? from : flen; |
| 487 |
if (UTFMODE) |
| 488 |
utfincptr(beg, &finc); |
| 489 |
beg += finc; |
| 490 |
flen = utflen(beg); |
| 491 |
if (num < 0 || num > flen) |
| 492 |
num = flen; |
| 493 |
if (UTFMODE) |
| 494 |
utfincptr(beg, &num); |
| 495 |
strndupx(x.str, beg, num, ATEMP); |
| 496 |
goto do_CSUBST; |
| 497 |
} |
| 498 |
case ORD('/') | STYPE_AT: |
| 499 |
case ORD('/'): { |
| 500 |
char *s, *p, *d, *sbeg, *end; |
| 501 |
char *pat = NULL, *rrep = null; |
| 502 |
char fpat = 0, *tpat1, *tpat2; |
| 503 |
char *ws, *wpat, *wrep; |
| 504 |
|
| 505 |
s = ws = wdcopy(sp, ATEMP); |
| 506 |
p = s + (wdscan(sp, ADELIM) - sp); |
| 507 |
d = s + (wdscan(sp, CSUBST) - sp); |
| 508 |
p[-2] = EOS; |
| 509 |
if (ord(p[-1]) == ORD(/*{*/ '}')) |
| 510 |
d = NULL; |
| 511 |
else |
| 512 |
d[-2] = EOS; |
| 513 |
sp += (d ? d : p) - s - 1; |
| 514 |
if (!(stype & STYPE_MASK) && |
| 515 |
s[0] == CHAR && |
| 516 |
ctype(s[1], C_SUB2)) |
| 517 |
fpat = s[1]; |
| 518 |
wpat = s + (fpat ? 2 : 0); |
| 519 |
wrep = d ? p : NULL; |
| 520 |
if (!(stype & STYPE_AT)) { |
| 521 |
rrep = wrep ? evalstr(wrep, |
| 522 |
DOTILDE | DOSCALAR) : |
| 523 |
null; |
| 524 |
} |
| 525 |
|
| 526 |
/* prepare string on which to work */ |
| 527 |
strdupx(s, str_val(st->var), ATEMP); |
| 528 |
sbeg = s; |
| 529 |
again_search: |
| 530 |
pat = evalstr(wpat, |
| 531 |
DOTILDE | DOSCALAR | DOPAT); |
| 532 |
/* check for special cases */ |
| 533 |
if (!*pat && !fpat) { |
| 534 |
/* |
| 535 |
* empty unanchored |
| 536 |
* pattern => reject |
| 537 |
*/ |
| 538 |
goto no_repl; |
| 539 |
} |
| 540 |
if ((stype & STYPE_MASK) && |
| 541 |
gmatchx(null, pat, false)) { |
| 542 |
/* |
| 543 |
* pattern matches empty |
| 544 |
* string => don't loop |
| 545 |
*/ |
| 546 |
stype &= ~STYPE_MASK; |
| 547 |
} |
| 548 |
|
| 549 |
/* first see if we have any match at all */ |
| 550 |
if (ord(fpat) == ORD('#')) { |
| 551 |
/* anchor at the beginning */ |
| 552 |
tpat1 = shf_smprintf("%s%c*", pat, MAGIC); |
| 553 |
tpat2 = tpat1; |
| 554 |
} else if (ord(fpat) == ORD('%')) { |
| 555 |
/* anchor at the end */ |
| 556 |
tpat1 = shf_smprintf("%c*%s", MAGIC, pat); |
| 557 |
tpat2 = pat; |
| 558 |
} else { |
| 559 |
/* float */ |
| 560 |
tpat1 = shf_smprintf("%c*%s%c*", MAGIC, pat, MAGIC); |
| 561 |
tpat2 = tpat1 + 2; |
| 562 |
} |
| 563 |
again_repl: |
| 564 |
/* |
| 565 |
* this would not be necessary if gmatchx would return |
| 566 |
* the start and end values of a match found, like re* |
| 567 |
*/ |
| 568 |
if (!gmatchx(sbeg, tpat1, false)) |
| 569 |
goto end_repl; |
| 570 |
end = strnul(s); |
| 571 |
/* now anchor the beginning of the match */ |
| 572 |
if (ord(fpat) != ORD('#')) |
| 573 |
while (sbeg <= end) { |
| 574 |
if (gmatchx(sbeg, tpat2, false)) |
| 575 |
break; |
| 576 |
else |
| 577 |
sbeg++; |
| 578 |
} |
| 579 |
/* now anchor the end of the match */ |
| 580 |
p = end; |
| 581 |
if (ord(fpat) != ORD('%')) |
| 582 |
while (p >= sbeg) { |
| 583 |
bool gotmatch; |
| 584 |
|
| 585 |
c = ord(*p); |
| 586 |
*p = '\0'; |
| 587 |
gotmatch = tobool(gmatchx(sbeg, pat, false)); |
| 588 |
*p = c; |
| 589 |
if (gotmatch) |
| 590 |
break; |
| 591 |
p--; |
| 592 |
} |
| 593 |
strndupx(end, sbeg, p - sbeg, ATEMP); |
| 594 |
record_match(end); |
| 595 |
afree(end, ATEMP); |
| 596 |
if (stype & STYPE_AT) { |
| 597 |
if (rrep != null) |
| 598 |
afree(rrep, ATEMP); |
| 599 |
rrep = wrep ? evalstr(wrep, |
| 600 |
DOTILDE | DOSCALAR) : |
| 601 |
null; |
| 602 |
} |
| 603 |
strndupx(end, s, sbeg - s, ATEMP); |
| 604 |
d = shf_smprintf(Tf_sss, end, rrep, p); |
| 605 |
afree(end, ATEMP); |
| 606 |
sbeg = d + (sbeg - s) + strlen(rrep); |
| 607 |
afree(s, ATEMP); |
| 608 |
s = d; |
| 609 |
if (stype & STYPE_AT) { |
| 610 |
afree(tpat1, ATEMP); |
| 611 |
afree(pat, ATEMP); |
| 612 |
goto again_search; |
| 613 |
} else if (stype & STYPE_DBL) |
| 614 |
goto again_repl; |
| 615 |
end_repl: |
| 616 |
afree(tpat1, ATEMP); |
| 617 |
x.str = s; |
| 618 |
no_repl: |
| 619 |
afree(pat, ATEMP); |
| 620 |
if (rrep != null) |
| 621 |
afree(rrep, ATEMP); |
| 622 |
afree(ws, ATEMP); |
| 623 |
goto do_CSUBST; |
| 624 |
} |
| 625 |
case ORD('#'): |
| 626 |
case ORD('%'): |
| 627 |
/* ! DOBLANK,DOBRACE */ |
| 628 |
f = (f & DONTRUNCOMMAND) | |
| 629 |
DOPAT | DOTILDE | |
| 630 |
DOTEMP | DOSCALAR; |
| 631 |
tilde_ok = 1; |
| 632 |
st->quotew = quote = 0; |
| 633 |
/* |
| 634 |
* Prepend open pattern (so | |
| 635 |
* in a trim will work as |
| 636 |
* expected) |
| 637 |
*/ |
| 638 |
if (!Flag(FSH)) { |
| 639 |
*dp++ = MAGIC; |
| 640 |
*dp++ = ORD(0x80 | '@'); |
| 641 |
} |
| 642 |
break; |
| 643 |
case ORD('='): |
| 644 |
/* |
| 645 |
* Tilde expansion for string |
| 646 |
* variables in POSIX mode is |
| 647 |
* governed by Austinbug 351. |
| 648 |
* In non-POSIX mode historic |
| 649 |
* ksh behaviour (enable it!) |
| 650 |
* us followed. |
| 651 |
* Not doing tilde expansion |
| 652 |
* for integer variables is a |
| 653 |
* non-POSIX thing - makes |
| 654 |
* sense though, since ~ is |
| 655 |
* a arithmetic operator. |
| 656 |
*/ |
| 657 |
if (!(x.var->flag & INTEGER)) |
| 658 |
f |= DOASNTILDE | DOTILDE; |
| 659 |
f |= DOTEMP | DOSCALAR; |
| 660 |
/* |
| 661 |
* These will be done after the |
| 662 |
* value has been assigned. |
| 663 |
*/ |
| 664 |
f &= ~(DOBLANK|DOGLOB|DOBRACE); |
| 665 |
tilde_ok = 1; |
| 666 |
break; |
| 667 |
case ORD('?'): |
| 668 |
if (*sp == CSUBST) |
| 669 |
errorf("%s: parameter null or not set", |
| 670 |
st->var->name); |
| 671 |
f &= ~DOBLANK; |
| 672 |
f |= DOTEMP; |
| 673 |
/* FALLTHROUGH */ |
| 674 |
default: |
| 675 |
/* '-' '+' '?' */ |
| 676 |
if (quote) |
| 677 |
word = IFS_WORD; |
| 678 |
else if (dp == Xstring(ds, dp)) |
| 679 |
word = IFS_IWS; |
| 680 |
/* Enable tilde expansion */ |
| 681 |
tilde_ok = 1; |
| 682 |
f |= DOTILDE; |
| 683 |
} |
| 684 |
} else |
| 685 |
/* skip word */ |
| 686 |
sp += wdscan(sp, CSUBST) - sp; |
| 687 |
continue; |
| 688 |
} |
| 689 |
case CSUBST: |
| 690 |
/* only get here if expanding word */ |
| 691 |
do_CSUBST: |
| 692 |
/* ({) skip the } or x */ |
| 693 |
sp++; |
| 694 |
/* in case of ${unset:-} */ |
| 695 |
tilde_ok = 0; |
| 696 |
*dp = '\0'; |
| 697 |
quote = st->quotep; |
| 698 |
f = st->f; |
| 699 |
if (f & DOBLANK) |
| 700 |
doblank--; |
| 701 |
switch (st->stype & STYPE_SINGLE) { |
| 702 |
case ORD('#'): |
| 703 |
case ORD('%'): |
| 704 |
if (!Flag(FSH)) { |
| 705 |
/* Append end-pattern */ |
| 706 |
*dp++ = MAGIC; |
| 707 |
*dp++ = ')'; |
| 708 |
} |
| 709 |
*dp = '\0'; |
| 710 |
dp = Xrestpos(ds, dp, st->base); |
| 711 |
/* |
| 712 |
* Must use st->var since calling |
| 713 |
* global would break things |
| 714 |
* like x[i+=1]. |
| 715 |
*/ |
| 716 |
x.str = trimsub(str_val(st->var), |
| 717 |
dp, st->stype); |
| 718 |
if (x.str[0] != '\0') { |
| 719 |
word = IFS_IWS; |
| 720 |
type = XSUB; |
| 721 |
} else if (quote) { |
| 722 |
word = IFS_WORD; |
| 723 |
type = XSUB; |
| 724 |
} else { |
| 725 |
if (dp == Xstring(ds, dp)) |
| 726 |
word = IFS_IWS; |
| 727 |
type = XNULLSUB; |
| 728 |
} |
| 729 |
if (f & DOBLANK) |
| 730 |
doblank++; |
| 731 |
st = st->prev; |
| 732 |
continue; |
| 733 |
case ORD('='): |
| 734 |
/* |
| 735 |
* Restore our position and substitute |
| 736 |
* the value of st->var (may not be |
| 737 |
* the assigned value in the presence |
| 738 |
* of integer/right-adj/etc attributes). |
| 739 |
*/ |
| 740 |
dp = Xrestpos(ds, dp, st->base); |
| 741 |
/* |
| 742 |
* Must use st->var since calling |
| 743 |
* global would cause with things |
| 744 |
* like x[i+=1] to be evaluated twice. |
| 745 |
*/ |
| 746 |
/* |
| 747 |
* Note: not exported by FEXPORT |
| 748 |
* in AT&T ksh. |
| 749 |
*/ |
| 750 |
/* |
| 751 |
* XXX POSIX says readonly is only |
| 752 |
* fatal for special builtins (setstr |
| 753 |
* does readonly check). |
| 754 |
*/ |
| 755 |
len = strlen(dp) + 1; |
| 756 |
setstr(st->var, |
| 757 |
debunk(alloc(len, ATEMP), |
| 758 |
dp, len), KSH_UNWIND_ERROR); |
| 759 |
x.str = str_val(st->var); |
| 760 |
type = XSUB; |
| 761 |
if (f & DOBLANK) |
| 762 |
doblank++; |
| 763 |
st = st->prev; |
| 764 |
word = quote || (!*x.str && (f & DOSCALAR)) ? IFS_WORD : IFS_IWS; |
| 765 |
continue; |
| 766 |
case ORD('?'): |
| 767 |
dp = Xrestpos(ds, dp, st->base); |
| 768 |
|
| 769 |
errorf(Tf_sD_s, st->var->name, |
| 770 |
debunk(dp, dp, strlen(dp) + 1)); |
| 771 |
break; |
| 772 |
case ORD('0'): |
| 773 |
case ORD('/') | STYPE_AT: |
| 774 |
case ORD('/'): |
| 775 |
case ORD('#') | STYPE_AT: |
| 776 |
case ORD('Q') | STYPE_AT: |
| 777 |
dp = Xrestpos(ds, dp, st->base); |
| 778 |
type = XSUB; |
| 779 |
word = quote || (!*x.str && (f & DOSCALAR)) ? IFS_WORD : IFS_IWS; |
| 780 |
if (f & DOBLANK) |
| 781 |
doblank++; |
| 782 |
st = st->prev; |
| 783 |
continue; |
| 784 |
/* default: '-' '+' */ |
| 785 |
} |
| 786 |
st = st->prev; |
| 787 |
type = XBASE; |
| 788 |
continue; |
| 789 |
|
| 790 |
case OPAT: |
| 791 |
/* open pattern: *(foo|bar) */ |
| 792 |
/* Next char is the type of pattern */ |
| 793 |
make_magic = true; |
| 794 |
c = ord(*sp++) | 0x80U; |
| 795 |
break; |
| 796 |
|
| 797 |
case SPAT: |
| 798 |
/* pattern separator (|) */ |
| 799 |
make_magic = true; |
| 800 |
c = ORD('|'); |
| 801 |
break; |
| 802 |
|
| 803 |
case CPAT: |
| 804 |
/* close pattern */ |
| 805 |
make_magic = true; |
| 806 |
c = ORD(/*(*/ ')'); |
| 807 |
break; |
| 808 |
} |
| 809 |
break; |
| 810 |
|
| 811 |
case XNULLSUB: |
| 812 |
/* |
| 813 |
* Special case for "$@" (and "${foo[@]}") - no |
| 814 |
* word is generated if $# is 0 (unless there is |
| 815 |
* other stuff inside the quotes). |
| 816 |
*/ |
| 817 |
type = XBASE; |
| 818 |
if (f & DOBLANK) { |
| 819 |
doblank--; |
| 820 |
if (dp == Xstring(ds, dp) && word != IFS_WORD) |
| 821 |
word = IFS_IWS; |
| 822 |
} |
| 823 |
continue; |
| 824 |
|
| 825 |
case XSUB: |
| 826 |
case XSUBMID: |
| 827 |
if ((c = ord(*x.str++)) == 0) { |
| 828 |
type = XBASE; |
| 829 |
if (f & DOBLANK) |
| 830 |
doblank--; |
| 831 |
continue; |
| 832 |
} |
| 833 |
break; |
| 834 |
|
| 835 |
case XARGSEP: |
| 836 |
type = XARG; |
| 837 |
quote = 1; |
| 838 |
/* FALLTHROUGH */ |
| 839 |
case XARG: |
| 840 |
if ((c = ord(*x.str++)) == '\0') { |
| 841 |
/* |
| 842 |
* force null words to be created so |
| 843 |
* set -- "" 2 ""; echo "$@" will do |
| 844 |
* the right thing |
| 845 |
*/ |
| 846 |
if (quote && x.split) |
| 847 |
word = IFS_WORD; |
| 848 |
if ((x.str = *x.u.strv++) == NULL) { |
| 849 |
type = XBASE; |
| 850 |
if (f & DOBLANK) |
| 851 |
doblank--; |
| 852 |
continue; |
| 853 |
} |
| 854 |
c = ord(ifs0); |
| 855 |
if ((f & DOHEREDOC)) { |
| 856 |
/* pseudo-field-split reliably */ |
| 857 |
if (c == 0) |
| 858 |
c = ORD(' '); |
| 859 |
break; |
| 860 |
} |
| 861 |
if ((f & DOSCALAR)) { |
| 862 |
/* do not field-split */ |
| 863 |
if (x.split) { |
| 864 |
c = ORD(' '); |
| 865 |
break; |
| 866 |
} |
| 867 |
if (c == 0) |
| 868 |
continue; |
| 869 |
} |
| 870 |
if (c == 0) { |
| 871 |
if (quote && !x.split) |
| 872 |
continue; |
| 873 |
if (!quote && word == IFS_WS) |
| 874 |
continue; |
| 875 |
/* this is so we don't terminate */ |
| 876 |
c = ORD(' '); |
| 877 |
/* now force-emit a word */ |
| 878 |
goto emit_word; |
| 879 |
} |
| 880 |
if (quote && x.split) { |
| 881 |
/* terminate word for "$@" */ |
| 882 |
type = XARGSEP; |
| 883 |
quote = 0; |
| 884 |
} |
| 885 |
} |
| 886 |
break; |
| 887 |
|
| 888 |
case XCOM: |
| 889 |
if (x.u.shf == NULL) { |
| 890 |
/* $(<...) failed */ |
| 891 |
subst_exstat = 1; |
| 892 |
/* fake EOF */ |
| 893 |
c = -1; |
| 894 |
} else if (newlines) { |
| 895 |
/* spit out saved NLs */ |
| 896 |
c = ORD('\n'); |
| 897 |
--newlines; |
| 898 |
} else { |
| 899 |
while ((c = shf_getc(x.u.shf)) == 0 || |
| 900 |
cinttype(c, C_NL)) { |
| 901 |
#ifdef MKSH_WITH_TEXTMODE |
| 902 |
if (c == ORD('\r')) { |
| 903 |
c = shf_getc(x.u.shf); |
| 904 |
switch (c) { |
| 905 |
case ORD('\n'): |
| 906 |
break; |
| 907 |
default: |
| 908 |
shf_ungetc(c, x.u.shf); |
| 909 |
/* FALLTHROUGH */ |
| 910 |
case -1: |
| 911 |
c = ORD('\r'); |
| 912 |
break; |
| 913 |
} |
| 914 |
} |
| 915 |
#endif |
| 916 |
if (c == ORD('\n')) |
| 917 |
/* save newlines */ |
| 918 |
newlines++; |
| 919 |
} |
| 920 |
if (newlines && c != -1) { |
| 921 |
shf_ungetc(c, x.u.shf); |
| 922 |
c = ORD('\n'); |
| 923 |
--newlines; |
| 924 |
} |
| 925 |
} |
| 926 |
if (c == -1) { |
| 927 |
newlines = 0; |
| 928 |
if (x.u.shf) |
| 929 |
shf_close(x.u.shf); |
| 930 |
if (x.split) |
| 931 |
subst_exstat = waitlast(); |
| 932 |
type = XBASE; |
| 933 |
if (f & DOBLANK) |
| 934 |
doblank--; |
| 935 |
continue; |
| 936 |
} |
| 937 |
break; |
| 938 |
} |
| 939 |
|
| 940 |
/* check for end of word or IFS separation */ |
| 941 |
if (c == 0 || (!quote && (f & DOBLANK) && doblank && |
| 942 |
!make_magic && ctype(c, C_IFS))) { |
| 943 |
/*- |
| 944 |
* How words are broken up: |
| 945 |
* | value of c |
| 946 |
* word | ws nws 0 |
| 947 |
* ----------------------------------- |
| 948 |
* IFS_WORD w/WS w/NWS w |
| 949 |
* IFS_WS -/WS -/NWS - |
| 950 |
* IFS_NWS -/NWS w/NWS - |
| 951 |
* IFS_IWS -/WS w/NWS - |
| 952 |
* (w means generate a word) |
| 953 |
*/ |
| 954 |
if ((word == IFS_WORD) || (word == IFS_QUOTE) || (c && |
| 955 |
(word == IFS_IWS || word == IFS_NWS) && |
| 956 |
!ctype(c, C_IFSWS))) { |
| 957 |
emit_word: |
| 958 |
if (f & DOHERESTR) |
| 959 |
*dp++ = '\n'; |
| 960 |
*dp++ = '\0'; |
| 961 |
cp = Xclose(ds, dp); |
| 962 |
if (fdo & DOBRACE) |
| 963 |
/* also does globbing */ |
| 964 |
alt_expand(wp, cp, cp, |
| 965 |
cp + Xlength(ds, (dp - 1)), |
| 966 |
fdo | (f & DOMARKDIRS)); |
| 967 |
else if (fdo & DOGLOB) |
| 968 |
glob(cp, wp, tobool(f & DOMARKDIRS)); |
| 969 |
else if ((f & DOPAT) || !(fdo & DOMAGIC)) |
| 970 |
XPput(*wp, cp); |
| 971 |
else |
| 972 |
XPput(*wp, debunk(cp, cp, |
| 973 |
strlen(cp) + 1)); |
| 974 |
fdo = 0; |
| 975 |
saw_eq = false; |
| 976 |
/* must be 1/0 */ |
| 977 |
tilde_ok = (f & (DOTILDE | DOASNTILDE)) ? 1 : 0; |
| 978 |
if (c == 0) |
| 979 |
return; |
| 980 |
Xinit(ds, dp, 128, ATEMP); |
| 981 |
} else if (c == 0) { |
| 982 |
return; |
| 983 |
} else if (type == XSUB && ctype(c, C_IFS) && |
| 984 |
!ctype(c, C_IFSWS) && Xlength(ds, dp) == 0) { |
| 985 |
*(cp = alloc(1, ATEMP)) = '\0'; |
| 986 |
XPput(*wp, cp); |
| 987 |
type = XSUBMID; |
| 988 |
} |
| 989 |
if (word != IFS_NWS) |
| 990 |
word = ctype(c, C_IFSWS) ? IFS_WS : IFS_NWS; |
| 991 |
} else { |
| 992 |
if (type == XSUB) { |
| 993 |
if (word == IFS_NWS && |
| 994 |
Xlength(ds, dp) == 0) { |
| 995 |
*(cp = alloc(1, ATEMP)) = '\0'; |
| 996 |
XPput(*wp, cp); |
| 997 |
} |
| 998 |
type = XSUBMID; |
| 999 |
} |
| 1000 |
|
| 1001 |
/* age tilde_ok info - ~ code tests second bit */ |
| 1002 |
tilde_ok <<= 1; |
| 1003 |
/* mark any special second pass chars */ |
| 1004 |
if (!quote) |
| 1005 |
switch (ord(c)) { |
| 1006 |
case ORD('['): |
| 1007 |
case ORD('!'): |
| 1008 |
case ORD('-'): |
| 1009 |
case ORD(']'): |
| 1010 |
/* |
| 1011 |
* For character classes - doesn't hurt |
| 1012 |
* to have magic !,-,]s outside of |
| 1013 |
* [...] expressions. |
| 1014 |
*/ |
| 1015 |
if (f & (DOPAT | DOGLOB)) { |
| 1016 |
fdo |= DOMAGIC; |
| 1017 |
if ((unsigned int)c == ORD('[')) |
| 1018 |
fdo |= f & DOGLOB; |
| 1019 |
*dp++ = MAGIC; |
| 1020 |
} |
| 1021 |
break; |
| 1022 |
case ORD('*'): |
| 1023 |
case ORD('?'): |
| 1024 |
if (f & (DOPAT | DOGLOB)) { |
| 1025 |
fdo |= DOMAGIC | (f & DOGLOB); |
| 1026 |
*dp++ = MAGIC; |
| 1027 |
} |
| 1028 |
break; |
| 1029 |
case ORD('{'): |
| 1030 |
case ORD('}'): |
| 1031 |
case ORD(','): |
| 1032 |
if ((f & DOBRACE) && |
| 1033 |
(ord(c) == ORD('{' /*}*/) || |
| 1034 |
(fdo & DOBRACE))) { |
| 1035 |
fdo |= DOBRACE|DOMAGIC; |
| 1036 |
*dp++ = MAGIC; |
| 1037 |
} |
| 1038 |
break; |
| 1039 |
case ORD('='): |
| 1040 |
/* Note first unquoted = for ~ */ |
| 1041 |
if (!(f & DOTEMP) && (!Flag(FPOSIX) || |
| 1042 |
(f & DOASNTILDE)) && !saw_eq) { |
| 1043 |
saw_eq = true; |
| 1044 |
tilde_ok = 1; |
| 1045 |
} |
| 1046 |
break; |
| 1047 |
case ORD(':'): |
| 1048 |
/* : */ |
| 1049 |
/* Note unquoted : for ~ */ |
| 1050 |
if (!(f & DOTEMP) && (f & DOASNTILDE)) |
| 1051 |
tilde_ok = 1; |
| 1052 |
break; |
| 1053 |
case ORD('~'): |
| 1054 |
/* |
| 1055 |
* tilde_ok is reset whenever |
| 1056 |
* any of ' " $( $(( ${ } are seen. |
| 1057 |
* Note that tilde_ok must be preserved |
| 1058 |
* through the sequence ${A=a=}~ |
| 1059 |
*/ |
| 1060 |
if (type == XBASE && |
| 1061 |
(f & (DOTILDE | DOASNTILDE)) && |
| 1062 |
(tilde_ok & 2)) { |
| 1063 |
const char *tcp; |
| 1064 |
char *tdp = dp; |
| 1065 |
|
| 1066 |
tcp = maybe_expand_tilde(sp, |
| 1067 |
&ds, &tdp, |
| 1068 |
tobool(f & DOASNTILDE)); |
| 1069 |
if (tcp) { |
| 1070 |
if (dp != tdp) |
| 1071 |
word = IFS_WORD; |
| 1072 |
dp = tdp; |
| 1073 |
sp = tcp; |
| 1074 |
continue; |
| 1075 |
} |
| 1076 |
} |
| 1077 |
break; |
| 1078 |
} |
| 1079 |
else |
| 1080 |
/* undo temporary */ |
| 1081 |
quote &= ~2; |
| 1082 |
|
| 1083 |
if (make_magic) { |
| 1084 |
make_magic = false; |
| 1085 |
fdo |= DOMAGIC | (f & DOGLOB); |
| 1086 |
*dp++ = MAGIC; |
| 1087 |
} else if (ISMAGIC(c)) { |
| 1088 |
fdo |= DOMAGIC; |
| 1089 |
*dp++ = MAGIC; |
| 1090 |
} |
| 1091 |
/* save output char */ |
| 1092 |
*dp++ = c; |
| 1093 |
word = IFS_WORD; |
| 1094 |
} |
| 1095 |
} |
| 1096 |
} |
| 1097 |
|
| 1098 |
static bool |
| 1099 |
hasnonempty(const char **strv) |
| 1100 |
{ |
| 1101 |
size_t i = 0; |
| 1102 |
|
| 1103 |
while (strv[i]) |
| 1104 |
if (*strv[i++]) |
| 1105 |
return (true); |
| 1106 |
return (false); |
| 1107 |
} |
| 1108 |
|
| 1109 |
/* |
| 1110 |
* Prepare to generate the string returned by ${} substitution. |
| 1111 |
*/ |
| 1112 |
static int |
| 1113 |
varsub(Expand *xp, const char *sp, const char *word, |
| 1114 |
int *stypep, /* becomes qualifier type */ |
| 1115 |
int *slenp) /* " " len (=, :=, etc.) valid iff *stypep != 0 */ |
| 1116 |
{ |
| 1117 |
int c; |
| 1118 |
int state; /* next state: XBASE, XARG, XSUB, XNULLSUB */ |
| 1119 |
int stype; /* substitution type */ |
| 1120 |
int slen = 0; |
| 1121 |
const char *p; |
| 1122 |
struct tbl *vp; |
| 1123 |
bool zero_ok = false; |
| 1124 |
|
| 1125 |
if ((stype = ord(sp[0])) == '\0') |
| 1126 |
/* Bad variable name */ |
| 1127 |
return (-1); |
| 1128 |
|
| 1129 |
xp->var = NULL; |
| 1130 |
|
| 1131 |
/*- |
| 1132 |
* ${#var}, string length (-U: characters, +U: octets) or array size |
| 1133 |
* ${%var}, string width (-U: screen columns, +U: octets) |
| 1134 |
*/ |
| 1135 |
c = ord(sp[1]); |
| 1136 |
if ((unsigned int)stype == ORD('%') && c == '\0') |
| 1137 |
return (-1); |
| 1138 |
if (ctype(stype, C_SUB2) && c != '\0') { |
| 1139 |
/* Can't have any modifiers for ${#...} or ${%...} */ |
| 1140 |
if (*word != CSUBST) |
| 1141 |
return (-1); |
| 1142 |
sp++; |
| 1143 |
/* Check for size of array */ |
| 1144 |
if ((p = cstrchr(sp, '[')) && (ord(p[1]) == ORD('*') || |
| 1145 |
ord(p[1]) == ORD('@')) && ord(p[2]) == ORD(']')) { |
| 1146 |
int n = 0; |
| 1147 |
|
| 1148 |
if ((unsigned int)stype != ORD('#')) |
| 1149 |
return (-1); |
| 1150 |
vp = global(arrayname(sp)); |
| 1151 |
if (vp->flag & (ISSET|ARRAY)) |
| 1152 |
zero_ok = true; |
| 1153 |
for (; vp; vp = vp->u.array) |
| 1154 |
if (vp->flag & ISSET) |
| 1155 |
n++; |
| 1156 |
c = n; |
| 1157 |
} else if ((unsigned int)c == ORD('*') || |
| 1158 |
(unsigned int)c == ORD('@')) { |
| 1159 |
if ((unsigned int)stype != ORD('#')) |
| 1160 |
return (-1); |
| 1161 |
c = e->loc->argc; |
| 1162 |
} else { |
| 1163 |
p = str_val(global(sp)); |
| 1164 |
zero_ok = p != null; |
| 1165 |
if ((unsigned int)stype == ORD('#')) |
| 1166 |
c = utflen(p); |
| 1167 |
else { |
| 1168 |
/* partial utf_mbswidth reimplementation */ |
| 1169 |
const char *s = p; |
| 1170 |
unsigned int wc; |
| 1171 |
size_t len; |
| 1172 |
int cw; |
| 1173 |
|
| 1174 |
c = 0; |
| 1175 |
while (*s) { |
| 1176 |
if (!UTFMODE || (len = utf_mbtowc(&wc, |
| 1177 |
s)) == (size_t)-1) |
| 1178 |
/* not UTFMODE or not UTF-8 */ |
| 1179 |
wc = rtt2asc(*s++); |
| 1180 |
else |
| 1181 |
/* UTFMODE and UTF-8 */ |
| 1182 |
s += len; |
| 1183 |
/* wc == char or wchar at s++ */ |
| 1184 |
if ((cw = utf_wcwidth(wc)) == -1) { |
| 1185 |
/* 646, 8859-1, 10646 C0/C1 */ |
| 1186 |
c = -1; |
| 1187 |
break; |
| 1188 |
} |
| 1189 |
c += cw; |
| 1190 |
} |
| 1191 |
} |
| 1192 |
} |
| 1193 |
if (Flag(FNOUNSET) && c == 0 && !zero_ok) |
| 1194 |
errorf(Tf_parm, sp); |
| 1195 |
/* unqualified variable/string substitution */ |
| 1196 |
*stypep = 0; |
| 1197 |
xp->str = shf_smprintf(Tf_d, c); |
| 1198 |
return (XSUB); |
| 1199 |
} |
| 1200 |
if ((unsigned int)stype == ORD('!') && c != '\0' && *word == CSUBST) { |
| 1201 |
sp++; |
| 1202 |
if ((p = cstrchr(sp, '[')) && (ord(p[1]) == ORD('*') || |
| 1203 |
ord(p[1]) == ORD('@')) && ord(p[2]) == ORD(']')) { |
| 1204 |
c = ORD('!'); |
| 1205 |
stype = 0; |
| 1206 |
goto arraynames; |
| 1207 |
} |
| 1208 |
xp->var = global(sp); |
| 1209 |
xp->str = p ? shf_smprintf("%s[%lu]", |
| 1210 |
xp->var->name, arrayindex(xp->var)) : xp->var->name; |
| 1211 |
*stypep = 0; |
| 1212 |
return (XSUB); |
| 1213 |
} |
| 1214 |
|
| 1215 |
/* Check for qualifiers in word part */ |
| 1216 |
stype = 0; |
| 1217 |
c = word[slen + 0] == CHAR ? ord(word[slen + 1]) : 0; |
| 1218 |
if ((unsigned int)c == ORD(':')) { |
| 1219 |
slen += 2; |
| 1220 |
stype = STYPE_DBL; |
| 1221 |
c = word[slen + 0] == CHAR ? ord(word[slen + 1]) : 0; |
| 1222 |
} |
| 1223 |
if (!stype && (unsigned int)c == ORD('/')) { |
| 1224 |
slen += 2; |
| 1225 |
stype = c; |
| 1226 |
if (word[slen] == ADELIM && |
| 1227 |
ord(word[slen + 1]) == (unsigned int)c) { |
| 1228 |
slen += 2; |
| 1229 |
stype |= STYPE_DBL; |
| 1230 |
} |
| 1231 |
} else if (stype == STYPE_DBL && ((unsigned int)c == ORD(' ') || |
| 1232 |
(unsigned int)c == ORD('0'))) { |
| 1233 |
stype |= ORD('0'); |
| 1234 |
} else if (ctype(c, C_SUB1)) { |
| 1235 |
slen += 2; |
| 1236 |
stype |= c; |
| 1237 |
} else if (ctype(c, C_SUB2)) { |
| 1238 |
/* Note: ksh88 allows :%, :%%, etc */ |
| 1239 |
slen += 2; |
| 1240 |
stype = c; |
| 1241 |
if (word[slen + 0] == CHAR && |
| 1242 |
ord(word[slen + 1]) == (unsigned int)c) { |
| 1243 |
stype |= STYPE_DBL; |
| 1244 |
slen += 2; |
| 1245 |
} |
| 1246 |
} else if ((unsigned int)c == ORD('@')) { |
| 1247 |
/* @x where x is command char */ |
| 1248 |
switch (c = ord(word[slen + 2]) == CHAR ? |
| 1249 |
ord(word[slen + 3]) : 0) { |
| 1250 |
case ORD('#'): |
| 1251 |
case ORD('/'): |
| 1252 |
case ORD('Q'): |
| 1253 |
break; |
| 1254 |
default: |
| 1255 |
return (-1); |
| 1256 |
} |
| 1257 |
stype |= STYPE_AT | c; |
| 1258 |
slen += 4; |
| 1259 |
} else if (stype) |
| 1260 |
/* : is not ok */ |
| 1261 |
return (-1); |
| 1262 |
if (!stype && *word != CSUBST) |
| 1263 |
return (-1); |
| 1264 |
|
| 1265 |
c = ord(sp[0]); |
| 1266 |
if ((unsigned int)c == ORD('*') || (unsigned int)c == ORD('@')) { |
| 1267 |
switch (stype & STYPE_SINGLE) { |
| 1268 |
/* can't assign to a vector */ |
| 1269 |
case ORD('='): |
| 1270 |
/* can't trim a vector (yet) */ |
| 1271 |
case ORD('%'): |
| 1272 |
case ORD('#'): |
| 1273 |
case ORD('?'): |
| 1274 |
case ORD('0'): |
| 1275 |
case ORD('/') | STYPE_AT: |
| 1276 |
case ORD('/'): |
| 1277 |
case ORD('#') | STYPE_AT: |
| 1278 |
case ORD('Q') | STYPE_AT: |
| 1279 |
return (-1); |
| 1280 |
} |
| 1281 |
if (e->loc->argc == 0) { |
| 1282 |
xp->str = null; |
| 1283 |
xp->var = global(sp); |
| 1284 |
state = (unsigned int)c == ORD('@') ? XNULLSUB : XSUB; |
| 1285 |
} else { |
| 1286 |
xp->u.strv = (const char **)e->loc->argv + 1; |
| 1287 |
xp->str = *xp->u.strv++; |
| 1288 |
/* $@ */ |
| 1289 |
xp->split = tobool((unsigned int)c == ORD('@')); |
| 1290 |
state = XARG; |
| 1291 |
} |
| 1292 |
/* POSIX 2009? */ |
| 1293 |
zero_ok = true; |
| 1294 |
} else if ((p = cstrchr(sp, '[')) && (ord(p[1]) == ORD('*') || |
| 1295 |
ord(p[1]) == ORD('@')) && ord(p[2]) == ORD(']')) { |
| 1296 |
XPtrV wv; |
| 1297 |
|
| 1298 |
switch (stype & STYPE_SINGLE) { |
| 1299 |
/* can't assign to a vector */ |
| 1300 |
case ORD('='): |
| 1301 |
/* can't trim a vector (yet) */ |
| 1302 |
case ORD('%'): |
| 1303 |
case ORD('#'): |
| 1304 |
case ORD('?'): |
| 1305 |
case ORD('0'): |
| 1306 |
case ORD('/') | STYPE_AT: |
| 1307 |
case ORD('/'): |
| 1308 |
case ORD('#') | STYPE_AT: |
| 1309 |
case ORD('Q') | STYPE_AT: |
| 1310 |
return (-1); |
| 1311 |
} |
| 1312 |
c = 0; |
| 1313 |
arraynames: |
| 1314 |
XPinit(wv, 32); |
| 1315 |
vp = global(arrayname(sp)); |
| 1316 |
for (; vp; vp = vp->u.array) { |
| 1317 |
if (!(vp->flag&ISSET)) |
| 1318 |
continue; |
| 1319 |
XPput(wv, (unsigned int)c == ORD('!') ? |
| 1320 |
shf_smprintf(Tf_lu, arrayindex(vp)) : |
| 1321 |
str_val(vp)); |
| 1322 |
} |
| 1323 |
if (XPsize(wv) == 0) { |
| 1324 |
xp->str = null; |
| 1325 |
state = ord(p[1]) == ORD('@') ? XNULLSUB : XSUB; |
| 1326 |
XPfree(wv); |
| 1327 |
} else { |
| 1328 |
XPput(wv, 0); |
| 1329 |
xp->u.strv = (const char **)XPptrv(wv); |
| 1330 |
xp->str = *xp->u.strv++; |
| 1331 |
/* ${foo[@]} */ |
| 1332 |
xp->split = tobool(ord(p[1]) == ORD('@')); |
| 1333 |
state = XARG; |
| 1334 |
} |
| 1335 |
} else { |
| 1336 |
xp->var = global(sp); |
| 1337 |
xp->str = str_val(xp->var); |
| 1338 |
/* can't assign things like $! or $1 */ |
| 1339 |
if ((unsigned int)(stype & STYPE_SINGLE) == ORD('=') && |
| 1340 |
!*xp->str && ctype(*sp, C_VAR1 | C_DIGIT)) |
| 1341 |
return (-1); |
| 1342 |
state = XSUB; |
| 1343 |
} |
| 1344 |
|
| 1345 |
c = stype & STYPE_CHAR; |
| 1346 |
/* test the compiler's code generator */ |
| 1347 |
if ((!(stype & STYPE_AT) && (ctype(c, C_SUB2) || |
| 1348 |
(((stype & STYPE_DBL) ? *xp->str == '\0' : xp->str == null) && |
| 1349 |
(state != XARG || (ifs0 || xp->split ? |
| 1350 |
(xp->u.strv[0] == NULL) : !hasnonempty(xp->u.strv))) ? |
| 1351 |
ctype(c, C_EQUAL | C_MINUS | C_QUEST) : (unsigned int)c == ORD('+')))) || |
| 1352 |
(unsigned int)stype == (ORD('0') | STYPE_DBL) || |
| 1353 |
(unsigned int)stype == (ORD('#') | STYPE_AT) || |
| 1354 |
(unsigned int)stype == (ORD('Q') | STYPE_AT) || |
| 1355 |
(unsigned int)(stype & STYPE_CHAR) == ORD('/')) |
| 1356 |
/* expand word instead of variable value */ |
| 1357 |
state = XBASE; |
| 1358 |
if (Flag(FNOUNSET) && xp->str == null && !zero_ok && |
| 1359 |
(ctype(c, C_SUB2) || (state != XBASE && (unsigned int)c != ORD('+')))) |
| 1360 |
errorf(Tf_parm, sp); |
| 1361 |
*stypep = stype; |
| 1362 |
*slenp = slen; |
| 1363 |
return (state); |
| 1364 |
} |
| 1365 |
|
| 1366 |
/* |
| 1367 |
* Run the command in $(...) and read its output. |
| 1368 |
*/ |
| 1369 |
static int |
| 1370 |
comsub(Expand *xp, const char *cp, int fn) |
| 1371 |
{ |
| 1372 |
Source *s, *sold; |
| 1373 |
struct op *t; |
| 1374 |
struct shf *shf; |
| 1375 |
bool doalias = false; |
| 1376 |
uint8_t old_utfmode = UTFMODE; |
| 1377 |
|
| 1378 |
switch (fn) { |
| 1379 |
case COMASUB: |
| 1380 |
fn = COMSUB; |
| 1381 |
if (0) |
| 1382 |
/* FALLTHROUGH */ |
| 1383 |
case FUNASUB: |
| 1384 |
fn = FUNSUB; |
| 1385 |
doalias = true; |
| 1386 |
} |
| 1387 |
|
| 1388 |
s = pushs(SSTRING, ATEMP); |
| 1389 |
s->start = s->str = cp; |
| 1390 |
sold = source; |
| 1391 |
t = compile(s, true, doalias); |
| 1392 |
afree(s, ATEMP); |
| 1393 |
source = sold; |
| 1394 |
|
| 1395 |
UTFMODE = old_utfmode; |
| 1396 |
|
| 1397 |
if (t == NULL) |
| 1398 |
return (XBASE); |
| 1399 |
|
| 1400 |
/* no waitlast() unless specifically enabled later */ |
| 1401 |
xp->split = false; |
| 1402 |
|
| 1403 |
if (t->type == TCOM && |
| 1404 |
*t->args == NULL && *t->vars == NULL && t->ioact != NULL) { |
| 1405 |
/* $(<file) */ |
| 1406 |
struct ioword *io = *t->ioact; |
| 1407 |
char *name; |
| 1408 |
|
| 1409 |
switch (io->ioflag & IOTYPE) { |
| 1410 |
case IOREAD: |
| 1411 |
shf = shf_open(name = evalstr(io->ioname, DOTILDE), |
| 1412 |
O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC); |
| 1413 |
if (shf == NULL) |
| 1414 |
warningf(!Flag(FTALKING), Tf_sD_s_sD_s, |
| 1415 |
name, Tcant_open, "$(<...) input", |
| 1416 |
cstrerror(errno)); |
| 1417 |
break; |
| 1418 |
case IOHERE: |
| 1419 |
if (!herein(io, &name)) { |
| 1420 |
xp->str = name; |
| 1421 |
/* as $(…) requires, trim trailing newlines */ |
| 1422 |
name = strnul(name); |
| 1423 |
while (name > xp->str && name[-1] == '\n') |
| 1424 |
--name; |
| 1425 |
*name = '\0'; |
| 1426 |
return (XSUB); |
| 1427 |
} |
| 1428 |
shf = NULL; |
| 1429 |
break; |
| 1430 |
default: |
| 1431 |
errorf(Tf_sD_s, T_funny_command, |
| 1432 |
snptreef(NULL, 32, Tft_R, io)); |
| 1433 |
} |
| 1434 |
} else if (fn == FUNSUB) { |
| 1435 |
int ofd1; |
| 1436 |
struct temp *tf = NULL; |
| 1437 |
|
| 1438 |
/* |
| 1439 |
* create a temporary file, open for reading and writing, |
| 1440 |
* with an shf open for reading (buffered) but yet unused |
| 1441 |
*/ |
| 1442 |
maketemp(ATEMP, TT_FUNSUB, &tf); |
| 1443 |
if (!tf->shf) { |
| 1444 |
errorf(Tf_temp, |
| 1445 |
Tcreate, tf->tffn, cstrerror(errno)); |
| 1446 |
} |
| 1447 |
/* extract shf from temporary file, unlink and free it */ |
| 1448 |
shf = tf->shf; |
| 1449 |
unlink(tf->tffn); |
| 1450 |
afree(tf, ATEMP); |
| 1451 |
/* save stdout and let it point to the tempfile */ |
| 1452 |
ofd1 = savefd(1); |
| 1453 |
ksh_dup2(shf_fileno(shf), 1, false); |
| 1454 |
/* |
| 1455 |
* run tree, with output thrown into the tempfile, |
| 1456 |
* in a new function block |
| 1457 |
*/ |
| 1458 |
valsub(t, NULL); |
| 1459 |
subst_exstat = exstat & 0xFF; |
| 1460 |
/* rewind the tempfile and restore regular stdout */ |
| 1461 |
lseek(shf_fileno(shf), (off_t)0, SEEK_SET); |
| 1462 |
restfd(1, ofd1); |
| 1463 |
} else if (fn == VALSUB) { |
| 1464 |
xp->str = valsub(t, ATEMP); |
| 1465 |
subst_exstat = exstat & 0xFF; |
| 1466 |
return (XSUB); |
| 1467 |
} else { |
| 1468 |
int ofd1, pv[2]; |
| 1469 |
|
| 1470 |
openpipe(pv); |
| 1471 |
shf = shf_fdopen(pv[0], SHF_RD, NULL); |
| 1472 |
ofd1 = savefd(1); |
| 1473 |
if (pv[1] != 1) { |
| 1474 |
ksh_dup2(pv[1], 1, false); |
| 1475 |
close(pv[1]); |
| 1476 |
} |
| 1477 |
execute(t, XXCOM | XPIPEO | XFORK, NULL); |
| 1478 |
restfd(1, ofd1); |
| 1479 |
startlast(); |
| 1480 |
/* waitlast() */ |
| 1481 |
xp->split = true; |
| 1482 |
} |
| 1483 |
|
| 1484 |
xp->u.shf = shf; |
| 1485 |
return (XCOM); |
| 1486 |
} |
| 1487 |
|
| 1488 |
/* |
| 1489 |
* perform #pattern and %pattern substitution in ${} |
| 1490 |
*/ |
| 1491 |
static char * |
| 1492 |
trimsub(char *str, char *pat, int how) |
| 1493 |
{ |
| 1494 |
char *end = strnul(str); |
| 1495 |
char *p, c; |
| 1496 |
|
| 1497 |
switch (how & (STYPE_CHAR | STYPE_DBL)) { |
| 1498 |
case ORD('#'): |
| 1499 |
/* shortest match at beginning */ |
| 1500 |
for (p = str; p <= end; p += utf_ptradj(p)) { |
| 1501 |
c = *p; *p = '\0'; |
| 1502 |
if (gmatchx(str, pat, false)) { |
| 1503 |
record_match(str); |
| 1504 |
*p = c; |
| 1505 |
return (p); |
| 1506 |
} |
| 1507 |
*p = c; |
| 1508 |
} |
| 1509 |
break; |
| 1510 |
case ORD('#') | STYPE_DBL: |
| 1511 |
/* longest match at beginning */ |
| 1512 |
for (p = end; p >= str; p--) { |
| 1513 |
c = *p; *p = '\0'; |
| 1514 |
if (gmatchx(str, pat, false)) { |
| 1515 |
record_match(str); |
| 1516 |
*p = c; |
| 1517 |
return (p); |
| 1518 |
} |
| 1519 |
*p = c; |
| 1520 |
} |
| 1521 |
break; |
| 1522 |
case ORD('%'): |
| 1523 |
/* shortest match at end */ |
| 1524 |
p = end; |
| 1525 |
while (p >= str) { |
| 1526 |
if (gmatchx(p, pat, false)) |
| 1527 |
goto trimsub_match; |
| 1528 |
if (UTFMODE) { |
| 1529 |
char *op = p; |
| 1530 |
while ((p-- > str) && ((rtt2asc(*p) & 0xC0) == 0x80)) |
| 1531 |
; |
| 1532 |
if ((p < str) || (p + utf_ptradj(p) != op)) |
| 1533 |
p = op - 1; |
| 1534 |
} else |
| 1535 |
--p; |
| 1536 |
} |
| 1537 |
break; |
| 1538 |
case ORD('%') | STYPE_DBL: |
| 1539 |
/* longest match at end */ |
| 1540 |
for (p = str; p <= end; p++) |
| 1541 |
if (gmatchx(p, pat, false)) { |
| 1542 |
trimsub_match: |
| 1543 |
record_match(p); |
| 1544 |
strndupx(end, str, p - str, ATEMP); |
| 1545 |
return (end); |
| 1546 |
} |
| 1547 |
break; |
| 1548 |
} |
| 1549 |
|
| 1550 |
/* no match, return string */ |
| 1551 |
return (str); |
| 1552 |
} |
| 1553 |
|
| 1554 |
/* |
| 1555 |
* glob |
| 1556 |
* Name derived from V6's /etc/glob, the program that expanded filenames. |
| 1557 |
*/ |
| 1558 |
|
| 1559 |
/* XXX cp not const 'cause slashes are temporarily replaced with NULs... */ |
| 1560 |
static void |
| 1561 |
glob(char *cp, XPtrV *wp, bool markdirs) |
| 1562 |
{ |
| 1563 |
int oldsize = XPsize(*wp); |
| 1564 |
|
| 1565 |
if (glob_str(cp, wp, markdirs) == 0) |
| 1566 |
XPput(*wp, debunk(cp, cp, strlen(cp) + 1)); |
| 1567 |
else |
| 1568 |
qsort(XPptrv(*wp) + oldsize, XPsize(*wp) - oldsize, |
| 1569 |
sizeof(void *), ascpstrcmp); |
| 1570 |
} |
| 1571 |
|
| 1572 |
#define GF_NONE 0 |
| 1573 |
#define GF_EXCHECK BIT(0) /* do existence check on file */ |
| 1574 |
#define GF_GLOBBED BIT(1) /* some globbing has been done */ |
| 1575 |
#define GF_MARKDIR BIT(2) /* add trailing / to directories */ |
| 1576 |
|
| 1577 |
/* |
| 1578 |
* Apply file globbing to cp and store the matching files in wp. Returns |
| 1579 |
* the number of matches found. |
| 1580 |
*/ |
| 1581 |
int |
| 1582 |
glob_str(char *cp, XPtrV *wp, bool markdirs) |
| 1583 |
{ |
| 1584 |
int oldsize = XPsize(*wp); |
| 1585 |
XString xs; |
| 1586 |
char *xp; |
| 1587 |
|
| 1588 |
Xinit(xs, xp, 256, ATEMP); |
| 1589 |
globit(&xs, &xp, cp, wp, markdirs ? GF_MARKDIR : GF_NONE); |
| 1590 |
Xfree(xs, xp); |
| 1591 |
|
| 1592 |
return (XPsize(*wp) - oldsize); |
| 1593 |
} |
| 1594 |
|
| 1595 |
static void |
| 1596 |
globit(XString *xs, /* dest string */ |
| 1597 |
char **xpp, /* ptr to dest end */ |
| 1598 |
char *sp, /* source path */ |
| 1599 |
XPtrV *wp, /* output list */ |
| 1600 |
int check) /* GF_* flags */ |
| 1601 |
{ |
| 1602 |
char *np; /* next source component */ |
| 1603 |
char *xp = *xpp; |
| 1604 |
char *se; |
| 1605 |
char odirsep; |
| 1606 |
|
| 1607 |
/* This to allow long expansions to be interrupted */ |
| 1608 |
intrcheck(); |
| 1609 |
|
| 1610 |
if (sp == NULL) { |
| 1611 |
/* end of source path */ |
| 1612 |
/* |
| 1613 |
* We only need to check if the file exists if a pattern |
| 1614 |
* is followed by a non-pattern (eg, foo*x/bar; no check |
| 1615 |
* is needed for foo* since the match must exist) or if |
| 1616 |
* any patterns were expanded and the markdirs option is set. |
| 1617 |
* Symlinks make things a bit tricky... |
| 1618 |
*/ |
| 1619 |
if ((check & GF_EXCHECK) || |
| 1620 |
((check & GF_MARKDIR) && (check & GF_GLOBBED))) { |
| 1621 |
#define stat_check() (stat_done ? stat_done : (stat_done = \ |
| 1622 |
stat(Xstring(*xs, xp), &statb) < 0 ? -1 : 1)) |
| 1623 |
struct stat lstatb, statb; |
| 1624 |
/* -1: failed, 1 ok, 0 not yet done */ |
| 1625 |
int stat_done = 0; |
| 1626 |
|
| 1627 |
if (mksh_lstat(Xstring(*xs, xp), &lstatb) < 0) |
| 1628 |
return; |
| 1629 |
/* |
| 1630 |
* special case for systems which strip trailing |
| 1631 |
* slashes from regular files (eg, /etc/passwd/). |
| 1632 |
* SunOS 4.1.3 does this... |
| 1633 |
*/ |
| 1634 |
if ((check & GF_EXCHECK) && xp > Xstring(*xs, xp) && |
| 1635 |
mksh_cdirsep(xp[-1]) && !S_ISDIR(lstatb.st_mode) && |
| 1636 |
(!S_ISLNK(lstatb.st_mode) || |
| 1637 |
stat_check() < 0 || !S_ISDIR(statb.st_mode))) |
| 1638 |
return; |
| 1639 |
/* |
| 1640 |
* Possibly tack on a trailing / if there isn't already |
| 1641 |
* one and if the file is a directory or a symlink to a |
| 1642 |
* directory |
| 1643 |
*/ |
| 1644 |
if (((check & GF_MARKDIR) && (check & GF_GLOBBED)) && |
| 1645 |
xp > Xstring(*xs, xp) && !mksh_cdirsep(xp[-1]) && |
| 1646 |
(S_ISDIR(lstatb.st_mode) || |
| 1647 |
(S_ISLNK(lstatb.st_mode) && stat_check() > 0 && |
| 1648 |
S_ISDIR(statb.st_mode)))) { |
| 1649 |
*xp++ = '/'; |
| 1650 |
*xp = '\0'; |
| 1651 |
} |
| 1652 |
} |
| 1653 |
strndupx(np, Xstring(*xs, xp), Xlength(*xs, xp), ATEMP); |
| 1654 |
XPput(*wp, np); |
| 1655 |
return; |
| 1656 |
} |
| 1657 |
|
| 1658 |
if (xp > Xstring(*xs, xp)) |
| 1659 |
*xp++ = '/'; |
| 1660 |
while (mksh_cdirsep(*sp)) { |
| 1661 |
Xcheck(*xs, xp); |
| 1662 |
*xp++ = *sp++; |
| 1663 |
} |
| 1664 |
np = mksh_sdirsep(sp); |
| 1665 |
if (np != NULL) { |
| 1666 |
se = np; |
| 1667 |
/* don't assume '/', can be multiple kinds */ |
| 1668 |
odirsep = *np; |
| 1669 |
*np++ = '\0'; |
| 1670 |
} else { |
| 1671 |
odirsep = '\0'; /* keep gcc quiet */ |
| 1672 |
se = strnul(sp); |
| 1673 |
} |
| 1674 |
|
| 1675 |
|
| 1676 |
/* |
| 1677 |
* Check if sp needs globbing - done to avoid pattern checks for strings |
| 1678 |
* containing MAGIC characters, open [s without the matching close ], |
| 1679 |
* etc. (otherwise opendir() will be called which may fail because the |
| 1680 |
* directory isn't readable - if no globbing is needed, only execute |
| 1681 |
* permission should be required (as per POSIX)). |
| 1682 |
*/ |
| 1683 |
if (!has_globbing(sp)) { |
| 1684 |
XcheckN(*xs, xp, se - sp + 1); |
| 1685 |
debunk(xp, sp, Xnleft(*xs, xp)); |
| 1686 |
xp = strnul(xp); |
| 1687 |
*xpp = xp; |
| 1688 |
globit(xs, xpp, np, wp, check); |
| 1689 |
} else { |
| 1690 |
DIR *dirp; |
| 1691 |
struct dirent *d; |
| 1692 |
char *name; |
| 1693 |
size_t len, prefix_len; |
| 1694 |
|
| 1695 |
/* xp = *xpp; copy_non_glob() may have re-alloc'd xs */ |
| 1696 |
*xp = '\0'; |
| 1697 |
prefix_len = Xlength(*xs, xp); |
| 1698 |
dirp = opendir(prefix_len ? Xstring(*xs, xp) : Tdot); |
| 1699 |
if (dirp == NULL) |
| 1700 |
goto Nodir; |
| 1701 |
while ((d = readdir(dirp)) != NULL) { |
| 1702 |
name = d->d_name; |
| 1703 |
if (name[0] == '.' && |
| 1704 |
(name[1] == 0 || (name[1] == '.' && name[2] == 0))) |
| 1705 |
/* always ignore . and .. */ |
| 1706 |
continue; |
| 1707 |
if ((*name == '.' && *sp != '.') || |
| 1708 |
!gmatchx(name, sp, true)) |
| 1709 |
continue; |
| 1710 |
|
| 1711 |
len = strlen(d->d_name) + 1; |
| 1712 |
XcheckN(*xs, xp, len); |
| 1713 |
memcpy(xp, name, len); |
| 1714 |
*xpp = xp + len - 1; |
| 1715 |
globit(xs, xpp, np, wp, (check & GF_MARKDIR) | |
| 1716 |
GF_GLOBBED | (np ? GF_EXCHECK : GF_NONE)); |
| 1717 |
xp = Xstring(*xs, xp) + prefix_len; |
| 1718 |
} |
| 1719 |
closedir(dirp); |
| 1720 |
Nodir: |
| 1721 |
; |
| 1722 |
} |
| 1723 |
|
| 1724 |
if (np != NULL) |
| 1725 |
*--np = odirsep; |
| 1726 |
} |
| 1727 |
|
| 1728 |
/* remove MAGIC from string */ |
| 1729 |
char * |
| 1730 |
debunk(char *dp, const char *sp, size_t dlen) |
| 1731 |
{ |
| 1732 |
char *d; |
| 1733 |
const char *s; |
| 1734 |
|
| 1735 |
if ((s = cstrchr(sp, MAGIC))) { |
| 1736 |
if (s - sp >= (ssize_t)dlen) |
| 1737 |
return (dp); |
| 1738 |
memmove(dp, sp, s - sp); |
| 1739 |
for (d = dp + (s - sp); *s && (d - dp < (ssize_t)dlen); s++) |
| 1740 |
if (!ISMAGIC(*s) || !(*++s & 0x80) || |
| 1741 |
!ctype(*s & 0x7F, C_PATMO | C_SPC)) |
| 1742 |
*d++ = *s; |
| 1743 |
else { |
| 1744 |
/* extended pattern operators: *+?@! */ |
| 1745 |
if ((*s & 0x7f) != ' ') |
| 1746 |
*d++ = *s & 0x7f; |
| 1747 |
if (d - dp < (ssize_t)dlen) |
| 1748 |
*d++ = '('; |
| 1749 |
} |
| 1750 |
*d = '\0'; |
| 1751 |
} else if (dp != sp) |
| 1752 |
strlcpy(dp, sp, dlen); |
| 1753 |
return (dp); |
| 1754 |
} |
| 1755 |
|
| 1756 |
/* |
| 1757 |
* Check if p is an unquoted name, possibly followed by a / or :. If so |
| 1758 |
* puts the expanded version in *dcp,dp and returns a pointer in p just |
| 1759 |
* past the name, otherwise returns 0. |
| 1760 |
*/ |
| 1761 |
static const char * |
| 1762 |
maybe_expand_tilde(const char *p, XString *dsp, char **dpp, bool isassign) |
| 1763 |
{ |
| 1764 |
XString ts; |
| 1765 |
char *dp = *dpp; |
| 1766 |
char *tp; |
| 1767 |
const char *r; |
| 1768 |
|
| 1769 |
Xinit(ts, tp, 16, ATEMP); |
| 1770 |
/* : only for DOASNTILDE form */ |
| 1771 |
while (p[0] == CHAR && /* not cdirsep */ p[1] != '/' && |
| 1772 |
(!isassign || p[1] != ':')) { |
| 1773 |
Xcheck(ts, tp); |
| 1774 |
*tp++ = p[1]; |
| 1775 |
p += 2; |
| 1776 |
} |
| 1777 |
*tp = '\0'; |
| 1778 |
r = (p[0] == EOS || p[0] == CHAR || p[0] == CSUBST) ? |
| 1779 |
do_tilde(Xstring(ts, tp)) : NULL; |
| 1780 |
Xfree(ts, tp); |
| 1781 |
if (r) { |
| 1782 |
while (*r) { |
| 1783 |
Xcheck(*dsp, dp); |
| 1784 |
if (ISMAGIC(*r)) |
| 1785 |
*dp++ = MAGIC; |
| 1786 |
*dp++ = *r++; |
| 1787 |
} |
| 1788 |
*dpp = dp; |
| 1789 |
r = p; |
| 1790 |
} |
| 1791 |
return (r); |
| 1792 |
} |
| 1793 |
|
| 1794 |
/* |
| 1795 |
* tilde expansion |
| 1796 |
* |
| 1797 |
* based on a version by Arnold Robbins |
| 1798 |
*/ |
| 1799 |
char * |
| 1800 |
do_tilde(char *cp) |
| 1801 |
{ |
| 1802 |
char *dp = null; |
| 1803 |
#ifndef MKSH_NOPWNAM |
| 1804 |
bool do_simplify = true; |
| 1805 |
#endif |
| 1806 |
|
| 1807 |
if (cp[0] == '\0') |
| 1808 |
dp = str_val(global("HOME")); |
| 1809 |
else if (cp[0] == '+' && cp[1] == '\0') |
| 1810 |
dp = str_val(global(TPWD)); |
| 1811 |
else if (ksh_isdash(cp)) |
| 1812 |
dp = str_val(global(TOLDPWD)); |
| 1813 |
#ifndef MKSH_NOPWNAM |
| 1814 |
else { |
| 1815 |
dp = homedir(cp); |
| 1816 |
do_simplify = false; |
| 1817 |
} |
| 1818 |
#endif |
| 1819 |
|
| 1820 |
/* if parameters aren't set, don't expand ~ */ |
| 1821 |
if (dp == NULL || dp == null) |
| 1822 |
return (NULL); |
| 1823 |
|
| 1824 |
/* simplify parameters as if cwd upon entry */ |
| 1825 |
#ifndef MKSH_NOPWNAM |
| 1826 |
if (do_simplify) |
| 1827 |
#endif |
| 1828 |
{ |
| 1829 |
strdupx(dp, dp, ATEMP); |
| 1830 |
simplify_path(dp); |
| 1831 |
} |
| 1832 |
return (dp); |
| 1833 |
} |
| 1834 |
|
| 1835 |
#ifndef MKSH_NOPWNAM |
| 1836 |
/* |
| 1837 |
* map userid to user's home directory. |
| 1838 |
* note that 4.3's getpw adds more than 6K to the shell, |
| 1839 |
* and the YP version probably adds much more. |
| 1840 |
* we might consider our own version of getpwnam() to keep the size down. |
| 1841 |
*/ |
| 1842 |
static char * |
| 1843 |
homedir(char *name) |
| 1844 |
{ |
| 1845 |
struct tbl *ap; |
| 1846 |
|
| 1847 |
ap = ktenter(&homedirs, name, hash(name)); |
| 1848 |
if (!(ap->flag & ISSET)) { |
| 1849 |
struct passwd *pw; |
| 1850 |
|
| 1851 |
pw = getpwnam(name); |
| 1852 |
if (pw == NULL) |
| 1853 |
return (NULL); |
| 1854 |
strdupx(ap->val.s, pw->pw_dir, APERM); |
| 1855 |
ap->flag |= DEFINED|ISSET|ALLOC; |
| 1856 |
} |
| 1857 |
return (ap->val.s); |
| 1858 |
} |
| 1859 |
#endif |
| 1860 |
|
| 1861 |
static void |
| 1862 |
alt_expand(XPtrV *wp, char *start, char *exp_start, char *end, int fdo) |
| 1863 |
{ |
| 1864 |
unsigned int count = 0; |
| 1865 |
char *brace_start, *brace_end, *comma = NULL; |
| 1866 |
char *field_start; |
| 1867 |
char *p = exp_start; |
| 1868 |
|
| 1869 |
/* search for open brace */ |
| 1870 |
while ((p = strchr(p, MAGIC)) && ord(p[1]) != ORD('{' /*}*/)) |
| 1871 |
p += 2; |
| 1872 |
brace_start = p; |
| 1873 |
|
| 1874 |
/* find matching close brace, if any */ |
| 1875 |
if (p) { |
| 1876 |
comma = NULL; |
| 1877 |
count = 1; |
| 1878 |
p += 2; |
| 1879 |
while (*p && count) { |
| 1880 |
if (ISMAGIC(*p++)) { |
| 1881 |
if (ord(*p) == ORD('{' /*}*/)) |
| 1882 |
++count; |
| 1883 |
else if (ord(*p) == ORD(/*{*/ '}')) |
| 1884 |
--count; |
| 1885 |
else if (*p == ',' && count == 1) |
| 1886 |
comma = p; |
| 1887 |
++p; |
| 1888 |
} |
| 1889 |
} |
| 1890 |
} |
| 1891 |
/* no valid expansions... */ |
| 1892 |
if (!p || count != 0) { |
| 1893 |
/* |
| 1894 |
* Note that given a{{b,c} we do not expand anything (this is |
| 1895 |
* what AT&T ksh does. This may be changed to do the {b,c} |
| 1896 |
* expansion. } |
| 1897 |
*/ |
| 1898 |
if (fdo & DOGLOB) |
| 1899 |
glob(start, wp, tobool(fdo & DOMARKDIRS)); |
| 1900 |
else |
| 1901 |
XPput(*wp, debunk(start, start, end - start)); |
| 1902 |
return; |
| 1903 |
} |
| 1904 |
brace_end = p; |
| 1905 |
if (!comma) { |
| 1906 |
alt_expand(wp, start, brace_end, end, fdo); |
| 1907 |
return; |
| 1908 |
} |
| 1909 |
|
| 1910 |
/* expand expression */ |
| 1911 |
field_start = brace_start + 2; |
| 1912 |
count = 1; |
| 1913 |
for (p = brace_start + 2; p != brace_end; p++) { |
| 1914 |
if (ISMAGIC(*p)) { |
| 1915 |
if (ord(*++p) == ORD('{' /*}*/)) |
| 1916 |
++count; |
| 1917 |
else if ((ord(*p) == ORD(/*{*/ '}') && --count == 0) || |
| 1918 |
(*p == ',' && count == 1)) { |
| 1919 |
char *news; |
| 1920 |
int l1, l2, l3; |
| 1921 |
|
| 1922 |
/* |
| 1923 |
* addition safe since these operate on |
| 1924 |
* one string (separate substrings) |
| 1925 |
*/ |
| 1926 |
l1 = brace_start - start; |
| 1927 |
l2 = (p - 1) - field_start; |
| 1928 |
l3 = end - brace_end; |
| 1929 |
news = alloc(l1 + l2 + l3 + 1, ATEMP); |
| 1930 |
memcpy(news, start, l1); |
| 1931 |
memcpy(news + l1, field_start, l2); |
| 1932 |
memcpy(news + l1 + l2, brace_end, l3); |
| 1933 |
news[l1 + l2 + l3] = '\0'; |
| 1934 |
alt_expand(wp, news, news + l1, |
| 1935 |
news + l1 + l2 + l3, fdo); |
| 1936 |
field_start = p + 1; |
| 1937 |
} |
| 1938 |
} |
| 1939 |
} |
| 1940 |
return; |
| 1941 |
} |
| 1942 |
|
| 1943 |
/* helper function due to setjmp/longjmp woes */ |
| 1944 |
static char * |
| 1945 |
valsub(struct op *t, Area *ap) |
| 1946 |
{ |
| 1947 |
char * volatile cp = NULL; |
| 1948 |
struct tbl * volatile vp = NULL; |
| 1949 |
|
| 1950 |
newenv(E_FUNC); |
| 1951 |
newblock(); |
| 1952 |
if (ap) |
| 1953 |
vp = local("REPLY", false); |
| 1954 |
if (!kshsetjmp(e->jbuf)) |
| 1955 |
execute(t, XXCOM | XERROK, NULL); |
| 1956 |
if (vp) |
| 1957 |
strdupx(cp, str_val(vp), ap); |
| 1958 |
quitenv(NULL); |
| 1959 |
|
| 1960 |
return (cp); |
| 1961 |
} |
