| File: | src/bin/ksh/eval.c |
| Warning: | line 394, column 13 Access to field 'quote' results in a dereference of a null pointer (loaded from variable 'st') |
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| 1 | /* $OpenBSD: eval.c,v 1.67 2023/05/24 14:20:33 millert Exp $ */ | |||
| 2 | ||||
| 3 | /* | |||
| 4 | * Expansion - quoting, separation, substitution, globbing | |||
| 5 | */ | |||
| 6 | ||||
| 7 | #include <sys/stat.h> | |||
| 8 | ||||
| 9 | #include <ctype.h> | |||
| 10 | #include <dirent.h> | |||
| 11 | #include <errno(*__errno()).h> | |||
| 12 | #include <fcntl.h> | |||
| 13 | #include <pwd.h> | |||
| 14 | #include <stdio.h> | |||
| 15 | #include <string.h> | |||
| 16 | #include <unistd.h> | |||
| 17 | ||||
| 18 | #include "sh.h" | |||
| 19 | ||||
| 20 | /* | |||
| 21 | * string expansion | |||
| 22 | * | |||
| 23 | * first pass: quoting, IFS separation, ~, ${}, $() and $(()) substitution. | |||
| 24 | * second pass: alternation ({,}), filename expansion (*?[]). | |||
| 25 | */ | |||
| 26 | ||||
| 27 | /* expansion generator state */ | |||
| 28 | typedef struct Expand { | |||
| 29 | /* int type; */ /* see expand() */ | |||
| 30 | const char *str; /* string */ | |||
| 31 | union { | |||
| 32 | const char **strv;/* string[] */ | |||
| 33 | struct shf *shf;/* file */ | |||
| 34 | } u; /* source */ | |||
| 35 | struct tbl *var; /* variable in ${var..} */ | |||
| 36 | short split; /* split "$@" / call waitlast $() */ | |||
| 37 | } Expand; | |||
| 38 | ||||
| 39 | #define XBASE0 0 /* scanning original */ | |||
| 40 | #define XSUB1 1 /* expanding ${} string */ | |||
| 41 | #define XARGSEP2 2 /* ifs0 between "$*" */ | |||
| 42 | #define XARG3 3 /* expanding $*, $@ */ | |||
| 43 | #define XCOM4 4 /* expanding $() */ | |||
| 44 | #define XNULLSUB5 5 /* "$@" when $# is 0 (don't generate word) */ | |||
| 45 | #define XSUBMID6 6 /* middle of expanding ${} */ | |||
| 46 | ||||
| 47 | /* States used for field splitting */ | |||
| 48 | #define IFS_WORD0 0 /* word has chars (or quotes) */ | |||
| 49 | #define IFS_WS1 1 /* have seen IFS white-space */ | |||
| 50 | #define IFS_NWS2 2 /* have seen IFS non-white-space */ | |||
| 51 | #define IFS_IWS3 3 /* beginning of word, ignore IFS white-space */ | |||
| 52 | #define IFS_QUOTE4 4 /* beg.w/quote, becomes IFS_WORD unless "$@" */ | |||
| 53 | ||||
| 54 | static int varsub(Expand *, char *, char *, int *, int *); | |||
| 55 | static int comsub(Expand *, char *); | |||
| 56 | static char *trimsub(char *, char *, int); | |||
| 57 | static void glob(char *, XPtrV *, int); | |||
| 58 | static void globit(XString *, char **, char *, XPtrV *, int); | |||
| 59 | static char *maybe_expand_tilde(char *, XString *, char **, int); | |||
| 60 | static char *tilde(char *); | |||
| 61 | static char *homedir(char *); | |||
| 62 | static void alt_expand(XPtrV *, char *, char *, char *, int); | |||
| 63 | ||||
| 64 | static struct tbl *varcpy(struct tbl *); | |||
| 65 | ||||
| 66 | /* compile and expand word */ | |||
| 67 | char * | |||
| 68 | substitute(const char *cp, int f) | |||
| 69 | { | |||
| 70 | struct source *s, *sold; | |||
| 71 | ||||
| 72 | if (disable_subst) | |||
| 73 | return str_save(cp, ATEMP&genv->area); | |||
| 74 | ||||
| 75 | sold = source; | |||
| 76 | s = pushs(SWSTR4, ATEMP&genv->area); | |||
| 77 | s->start = s->str = cp; | |||
| 78 | source = s; | |||
| 79 | if (yylex(ONEWORD(1<<(1))) != LWORD256) | |||
| 80 | internal_errorf("substitute"); | |||
| 81 | source = sold; | |||
| 82 | afree(s, ATEMP&genv->area); | |||
| 83 | return evalstr(yylval.cp, f); | |||
| 84 | } | |||
| 85 | ||||
| 86 | /* | |||
| 87 | * expand arg-list | |||
| 88 | */ | |||
| 89 | char ** | |||
| 90 | eval(char **ap, int f) | |||
| 91 | { | |||
| 92 | XPtrV w; | |||
| 93 | ||||
| 94 | if (*ap == NULL((void *)0)) | |||
| 95 | return ap; | |||
| 96 | XPinit(w, 32)do { void **vp__; vp__ = areallocarray(((void *)0), 32, sizeof (void *), &genv->area); (w).cur = (w).beg = vp__; (w). end = vp__ + 32; } while (0); | |||
| 97 | XPput(w, NULL)do { if ((w).cur >= (w).end) { int n = ((w).cur - (w).beg) ; (w).beg = areallocarray((w).beg, n, 2 * sizeof(void *), & genv->area); (w).cur = (w).beg + n; (w).end = (w).cur + n; } *(w).cur++ = (((void *)0)); } while (0); /* space for shell name */ | |||
| 98 | while (*ap != NULL((void *)0)) | |||
| 99 | expand(*ap++, &w, f); | |||
| 100 | XPput(w, NULL)do { if ((w).cur >= (w).end) { int n = ((w).cur - (w).beg) ; (w).beg = areallocarray((w).beg, n, 2 * sizeof(void *), & genv->area); (w).cur = (w).beg + n; (w).end = (w).cur + n; } *(w).cur++ = (((void *)0)); } while (0); | |||
| 101 | return (char **) XPclose(w)areallocarray((w).beg, ((w).cur - (w).beg), sizeof(void *), & genv->area) + 1; | |||
| 102 | } | |||
| 103 | ||||
| 104 | /* | |||
| 105 | * expand string | |||
| 106 | */ | |||
| 107 | char * | |||
| 108 | evalstr(char *cp, int f) | |||
| 109 | { | |||
| 110 | XPtrV w; | |||
| 111 | ||||
| 112 | XPinit(w, 1)do { void **vp__; vp__ = areallocarray(((void *)0), 1, sizeof (void *), &genv->area); (w).cur = (w).beg = vp__; (w). end = vp__ + 1; } while (0); | |||
| 113 | expand(cp, &w, f); | |||
| 114 | cp = (XPsize(w)((w).cur - (w).beg) == 0) ? null : (char*) *XPptrv(w)((w).beg); | |||
| 115 | XPfree(w)afree((w).beg, &genv->area); | |||
| 116 | return cp; | |||
| 117 | } | |||
| 118 | ||||
| 119 | /* | |||
| 120 | * expand string - return only one component | |||
| 121 | * used from iosetup to expand redirection files | |||
| 122 | */ | |||
| 123 | char * | |||
| 124 | evalonestr(char *cp, int f) | |||
| 125 | { | |||
| 126 | XPtrV w; | |||
| 127 | ||||
| 128 | XPinit(w, 1)do { void **vp__; vp__ = areallocarray(((void *)0), 1, sizeof (void *), &genv->area); (w).cur = (w).beg = vp__; (w). end = vp__ + 1; } while (0); | |||
| 129 | expand(cp, &w, f); | |||
| 130 | switch (XPsize(w)((w).cur - (w).beg)) { | |||
| 131 | case 0: | |||
| 132 | cp = null; | |||
| 133 | break; | |||
| 134 | case 1: | |||
| 135 | cp = (char*) *XPptrv(w)((w).beg); | |||
| 136 | break; | |||
| 137 | default: | |||
| 138 | cp = evalstr(cp, f&~DOGLOB(1<<(1))); | |||
| 139 | break; | |||
| 140 | } | |||
| 141 | XPfree(w)afree((w).beg, &genv->area); | |||
| 142 | return cp; | |||
| 143 | } | |||
| 144 | ||||
| 145 | /* for nested substitution: ${var:=$var2} */ | |||
| 146 | typedef struct SubType { | |||
| 147 | short stype; /* [=+-?%#] action after expanded word */ | |||
| 148 | short base; /* begin position of expanded word */ | |||
| 149 | short f; /* saved value of f (DOPAT, etc) */ | |||
| 150 | struct tbl *var; /* variable for ${var..} */ | |||
| 151 | short quote; /* saved value of quote (for ${..[%#]..}) */ | |||
| 152 | struct SubType *prev; /* old type */ | |||
| 153 | struct SubType *next; /* poped type (to avoid re-allocating) */ | |||
| 154 | } SubType; | |||
| 155 | ||||
| 156 | void | |||
| 157 | expand(char *cp, /* input word */ | |||
| 158 | XPtrV *wp, /* output words */ | |||
| 159 | int f) /* DO* flags */ | |||
| 160 | { | |||
| 161 | int c = 0; | |||
| 162 | int type; /* expansion type */ | |||
| 163 | int quote = 0; /* quoted */ | |||
| 164 | XString ds; /* destination string */ | |||
| 165 | char *dp, *sp; /* dest., source */ | |||
| 166 | int fdo, word; /* second pass flags; have word */ | |||
| 167 | int doblank; /* field splitting of parameter/command subst */ | |||
| 168 | Expand x = { | |||
| 169 | /* expansion variables */ | |||
| 170 | NULL((void *)0), { NULL((void *)0) }, NULL((void *)0), 0 | |||
| 171 | }; | |||
| 172 | SubType st_head, *st; | |||
| 173 | int newlines = 0; /* For trailing newlines in COMSUB */ | |||
| 174 | int saw_eq, tilde_ok; | |||
| 175 | int make_magic; | |||
| 176 | size_t len; | |||
| 177 | ||||
| 178 | if (cp == NULL((void *)0)) | |||
| ||||
| 179 | internal_errorf("expand(NULL)"); | |||
| 180 | /* for alias, readonly, set, typeset commands */ | |||
| 181 | if ((f & DOVACHECK(1<<(9))) && is_wdvarassign(cp)) { | |||
| 182 | f &= ~(DOVACHECK(1<<(9))|DOBLANK(1<<(0))|DOGLOB(1<<(1))|DOTILDE(1<<(3))); | |||
| 183 | f |= DOASNTILDE(1<<(5)); | |||
| 184 | } | |||
| 185 | if (Flag(FNOGLOB)(shell_flags[(int) (FNOGLOB)])) | |||
| 186 | f &= ~DOGLOB(1<<(1)); | |||
| 187 | if (Flag(FMARKDIRS)(shell_flags[(int) (FMARKDIRS)])) | |||
| 188 | f |= DOMARKDIRS(1<<(10)); | |||
| 189 | if (Flag(FBRACEEXPAND)(shell_flags[(int) (FBRACEEXPAND)]) && (f & DOGLOB(1<<(1)))) | |||
| 190 | f |= DOBRACE_(1<<(6)); | |||
| 191 | ||||
| 192 | Xinit(ds, dp, 128, ATEMP)do { (ds).len = 128; (ds).areap = (&genv->area); (ds). beg = alloc((ds).len + 8, (ds).areap); (ds).end = (ds).beg + ( ds).len; dp = (ds).beg; } while (0); /* init dest. string */ | |||
| 193 | type = XBASE0; | |||
| 194 | sp = cp; | |||
| 195 | fdo = 0; | |||
| 196 | saw_eq = 0; | |||
| 197 | tilde_ok = (f & (DOTILDE(1<<(3))|DOASNTILDE(1<<(5)))) ? 1 : 0; /* must be 1/0 */ | |||
| 198 | doblank = 0; | |||
| 199 | make_magic = 0; | |||
| 200 | word = (f&DOBLANK(1<<(0))) ? IFS_WS1 : IFS_WORD0; | |||
| 201 | ||||
| 202 | memset(&st_head, 0, sizeof(st_head)); | |||
| 203 | st = &st_head; | |||
| 204 | ||||
| 205 | while (1) { | |||
| 206 | Xcheck(ds, dp)do { ptrdiff_t more = ((dp) + (1)) - (ds).end; if (more > 0 ) dp = Xcheck_grow_(&ds, dp, more); } while (0); | |||
| 207 | ||||
| 208 | switch (type) { | |||
| 209 | case XBASE0: /* original prefixed string */ | |||
| 210 | c = *sp++; | |||
| 211 | switch (c) { | |||
| 212 | case EOS0: | |||
| 213 | c = 0; | |||
| 214 | break; | |||
| 215 | case CHAR1: | |||
| 216 | c = *sp++; | |||
| 217 | break; | |||
| 218 | case QCHAR2: | |||
| 219 | quote |= 2; /* temporary quote */ | |||
| 220 | c = *sp++; | |||
| 221 | break; | |||
| 222 | case OQUOTE5: | |||
| 223 | switch (word) { | |||
| 224 | case IFS_QUOTE4: | |||
| 225 | /* """something */ | |||
| 226 | word = IFS_WORD0; | |||
| 227 | break; | |||
| 228 | case IFS_WORD0: | |||
| 229 | break; | |||
| 230 | default: | |||
| 231 | word = IFS_QUOTE4; | |||
| 232 | break; | |||
| 233 | } | |||
| 234 | tilde_ok = 0; | |||
| 235 | quote = 1; | |||
| 236 | continue; | |||
| 237 | case CQUOTE6: | |||
| 238 | quote = 0; | |||
| 239 | continue; | |||
| 240 | case COMSUB3: | |||
| 241 | tilde_ok = 0; | |||
| 242 | if (f & DONTRUNCOMMAND(1<<(4))) { | |||
| 243 | word = IFS_WORD0; | |||
| 244 | *dp++ = '$'; *dp++ = '('; | |||
| 245 | while (*sp != '\0') { | |||
| 246 | Xcheck(ds, dp)do { ptrdiff_t more = ((dp) + (1)) - (ds).end; if (more > 0 ) dp = Xcheck_grow_(&ds, dp, more); } while (0); | |||
| 247 | *dp++ = *sp++; | |||
| 248 | } | |||
| 249 | *dp++ = ')'; | |||
| 250 | } else { | |||
| 251 | type = comsub(&x, sp); | |||
| 252 | if (type == XCOM4 && (f&DOBLANK(1<<(0)))) | |||
| 253 | doblank++; | |||
| 254 | sp = strchr(sp, 0) + 1; | |||
| 255 | newlines = 0; | |||
| 256 | } | |||
| 257 | continue; | |||
| 258 | case EXPRSUB4: | |||
| 259 | word = IFS_WORD0; | |||
| 260 | tilde_ok = 0; | |||
| 261 | if (f & DONTRUNCOMMAND(1<<(4))) { | |||
| 262 | *dp++ = '$'; *dp++ = '('; *dp++ = '('; | |||
| 263 | while (*sp != '\0') { | |||
| 264 | Xcheck(ds, dp)do { ptrdiff_t more = ((dp) + (1)) - (ds).end; if (more > 0 ) dp = Xcheck_grow_(&ds, dp, more); } while (0); | |||
| 265 | *dp++ = *sp++; | |||
| 266 | } | |||
| 267 | *dp++ = ')'; *dp++ = ')'; | |||
| 268 | } else { | |||
| 269 | struct tbl v; | |||
| 270 | char *p; | |||
| 271 | ||||
| 272 | v.flag = DEFINED(1<<(1))|ISSET(1<<(2))|INTEGER(1<<(9)); | |||
| 273 | v.type = 10; /* not default */ | |||
| 274 | v.name[0] = '\0'; | |||
| 275 | v_evaluate(&v, substitute(sp, 0), | |||
| 276 | KSH_UNWIND_ERROR0x0, true1); | |||
| 277 | sp = strchr(sp, 0) + 1; | |||
| 278 | for (p = str_val(&v); *p; ) { | |||
| 279 | Xcheck(ds, dp)do { ptrdiff_t more = ((dp) + (1)) - (ds).end; if (more > 0 ) dp = Xcheck_grow_(&ds, dp, more); } while (0); | |||
| 280 | *dp++ = *p++; | |||
| 281 | } | |||
| 282 | } | |||
| 283 | continue; | |||
| 284 | case OSUBST7: /* ${{#}var{:}[=+-?#%]word} */ | |||
| 285 | /* format is: | |||
| 286 | * OSUBST [{x] plain-variable-part \0 | |||
| 287 | * compiled-word-part CSUBST [}x] | |||
| 288 | * This is where all syntax checking gets done... | |||
| 289 | */ | |||
| 290 | { | |||
| 291 | char *varname = ++sp; /* skip the { or x (}) */ | |||
| 292 | int stype; | |||
| 293 | int slen = 0; | |||
| 294 | ||||
| 295 | sp = strchr(sp, '\0') + 1; /* skip variable */ | |||
| 296 | type = varsub(&x, varname, sp, &stype, &slen); | |||
| 297 | if (type < 0) { | |||
| 298 | char endc; | |||
| 299 | char *str, *end; | |||
| 300 | ||||
| 301 | sp = varname - 2; /* restore sp */ | |||
| 302 | end = (char *) wdscan(sp, CSUBST8); | |||
| 303 | /* ({) the } or x is already skipped */ | |||
| 304 | endc = *end; | |||
| 305 | *end = EOS0; | |||
| 306 | str = snptreef(NULL((void *)0), 64, "%S", sp); | |||
| 307 | *end = endc; | |||
| 308 | errorf("%s: bad substitution", str); | |||
| 309 | } | |||
| 310 | if (f&DOBLANK(1<<(0))) | |||
| 311 | doblank++; | |||
| 312 | tilde_ok = 0; | |||
| 313 | if (word == IFS_QUOTE4 && type != XNULLSUB5) | |||
| 314 | word = IFS_WORD0; | |||
| 315 | if (type == XBASE0) { /* expand? */ | |||
| 316 | if (!st->next) { | |||
| 317 | SubType *newst; | |||
| 318 | ||||
| 319 | newst = alloc( | |||
| 320 | sizeof(SubType), ATEMP&genv->area); | |||
| 321 | newst->next = NULL((void *)0); | |||
| 322 | newst->prev = st; | |||
| 323 | st->next = newst; | |||
| 324 | } | |||
| 325 | st = st->next; | |||
| 326 | st->stype = stype; | |||
| 327 | st->base = Xsavepos(ds, dp)((dp) - (ds).beg); | |||
| 328 | st->f = f; | |||
| 329 | st->var = varcpy(x.var); | |||
| 330 | st->quote = quote; | |||
| 331 | /* skip qualifier(s) */ | |||
| 332 | if (stype) | |||
| 333 | sp += slen; | |||
| 334 | switch (stype & 0x7f) { | |||
| 335 | case '#': | |||
| 336 | case '%': | |||
| 337 | /* ! DOBLANK,DOBRACE_,DOTILDE */ | |||
| 338 | f = DOPAT(1<<(2)) | (f&DONTRUNCOMMAND(1<<(4))) | | |||
| 339 | DOTEMP_(1<<(8)); | |||
| 340 | quote = 0; | |||
| 341 | /* Prepend open pattern (so | | |||
| 342 | * in a trim will work as | |||
| 343 | * expected) | |||
| 344 | */ | |||
| 345 | *dp++ = MAGIC(7); | |||
| 346 | *dp++ = '@' + 0x80U; | |||
| 347 | break; | |||
| 348 | case '=': | |||
| 349 | /* Enabling tilde expansion | |||
| 350 | * after :'s here is | |||
| 351 | * non-standard ksh, but is | |||
| 352 | * consistent with rules for | |||
| 353 | * other assignments. Not | |||
| 354 | * sure what POSIX thinks of | |||
| 355 | * this. | |||
| 356 | * Not doing tilde expansion | |||
| 357 | * for integer variables is a | |||
| 358 | * non-POSIX thing - makes | |||
| 359 | * sense though, since ~ is | |||
| 360 | * a arithmetic operator. | |||
| 361 | */ | |||
| 362 | if (!(x.var->flag & INTEGER(1<<(9)))) | |||
| 363 | f |= DOASNTILDE(1<<(5))|DOTILDE(1<<(3)); | |||
| 364 | f |= DOTEMP_(1<<(8)); | |||
| 365 | /* These will be done after the | |||
| 366 | * value has been assigned. | |||
| 367 | */ | |||
| 368 | f &= ~(DOBLANK(1<<(0))|DOGLOB(1<<(1))|DOBRACE_(1<<(6))); | |||
| 369 | tilde_ok = 1; | |||
| 370 | break; | |||
| 371 | case '?': | |||
| 372 | f &= ~DOBLANK(1<<(0)); | |||
| 373 | f |= DOTEMP_(1<<(8)); | |||
| 374 | /* FALLTHROUGH */ | |||
| 375 | default: | |||
| 376 | /* '-' '+' '?' */ | |||
| 377 | if (quote) | |||
| 378 | word = IFS_WORD0; | |||
| 379 | else if (dp == Xstring(ds, dp)((ds).beg)) | |||
| 380 | word = IFS_IWS3; | |||
| 381 | /* Enable tilde expansion */ | |||
| 382 | tilde_ok = 1; | |||
| 383 | f |= DOTILDE(1<<(3)); | |||
| 384 | } | |||
| 385 | } else | |||
| 386 | /* skip word */ | |||
| 387 | sp = (char *) wdscan(sp, CSUBST8); | |||
| 388 | continue; | |||
| 389 | } | |||
| 390 | case CSUBST8: /* only get here if expanding word */ | |||
| 391 | sp++; /* ({) skip the } or x */ | |||
| 392 | tilde_ok = 0; /* in case of ${unset:-} */ | |||
| 393 | *dp = '\0'; | |||
| 394 | quote = st->quote; | |||
| ||||
| 395 | f = st->f; | |||
| 396 | if (f&DOBLANK(1<<(0))) | |||
| 397 | doblank--; | |||
| 398 | switch (st->stype&0x7f) { | |||
| 399 | case '#': | |||
| 400 | case '%': | |||
| 401 | /* Append end-pattern */ | |||
| 402 | *dp++ = MAGIC(7); *dp++ = ')'; *dp = '\0'; | |||
| 403 | dp = Xrestpos(ds, dp, st->base)((ds).beg + (st->base)); | |||
| 404 | /* Must use st->var since calling | |||
| 405 | * global would break things | |||
| 406 | * like x[i+=1]. | |||
| 407 | */ | |||
| 408 | x.str = trimsub(str_val(st->var), | |||
| 409 | dp, st->stype); | |||
| 410 | if (x.str[0] != '\0') { | |||
| 411 | word = IFS_IWS3; | |||
| 412 | type = XSUB1; | |||
| 413 | } else if (quote) { | |||
| 414 | word = IFS_WORD0; | |||
| 415 | type = XSUB1; | |||
| 416 | } else { | |||
| 417 | if (dp == Xstring(ds, dp)((ds).beg)) | |||
| 418 | word = IFS_IWS3; | |||
| 419 | type = XNULLSUB5; | |||
| 420 | } | |||
| 421 | if (f&DOBLANK(1<<(0))) | |||
| 422 | doblank++; | |||
| 423 | st = st->prev; | |||
| 424 | continue; | |||
| 425 | case '=': | |||
| 426 | /* Restore our position and substitute | |||
| 427 | * the value of st->var (may not be | |||
| 428 | * the assigned value in the presence | |||
| 429 | * of integer/right-adj/etc attributes). | |||
| 430 | */ | |||
| 431 | dp = Xrestpos(ds, dp, st->base)((ds).beg + (st->base)); | |||
| 432 | /* Must use st->var since calling | |||
| 433 | * global would cause with things | |||
| 434 | * like x[i+=1] to be evaluated twice. | |||
| 435 | */ | |||
| 436 | /* Note: not exported by FEXPORT | |||
| 437 | * in at&t ksh. | |||
| 438 | */ | |||
| 439 | /* XXX POSIX says readonly is only | |||
| 440 | * fatal for special builtins (setstr | |||
| 441 | * does readonly check). | |||
| 442 | */ | |||
| 443 | len = strlen(dp) + 1; | |||
| 444 | setstr(st->var, | |||
| 445 | debunk(alloc(len, ATEMP&genv->area), | |||
| 446 | dp, len), KSH_UNWIND_ERROR0x0); | |||
| 447 | x.str = str_val(st->var); | |||
| 448 | type = XSUB1; | |||
| 449 | if (f&DOBLANK(1<<(0))) | |||
| 450 | doblank++; | |||
| 451 | st = st->prev; | |||
| 452 | if (quote || !*x.str) | |||
| 453 | word = IFS_WORD0; | |||
| 454 | else | |||
| 455 | word = IFS_IWS3; | |||
| 456 | continue; | |||
| 457 | case '?': | |||
| 458 | { | |||
| 459 | char *s = Xrestpos(ds, dp, st->base)((ds).beg + (st->base)); | |||
| 460 | ||||
| 461 | errorf("%s: %s", st->var->name, | |||
| 462 | dp == s ? | |||
| 463 | "parameter null or not set" : | |||
| 464 | (debunk(s, s, strlen(s) + 1), s)); | |||
| 465 | } | |||
| 466 | } | |||
| 467 | st = st->prev; | |||
| 468 | type = XBASE0; | |||
| 469 | continue; | |||
| 470 | ||||
| 471 | case OPAT9: /* open pattern: *(foo|bar) */ | |||
| 472 | /* Next char is the type of pattern */ | |||
| 473 | make_magic = 1; | |||
| 474 | c = *sp++ + 0x80; | |||
| 475 | break; | |||
| 476 | ||||
| 477 | case SPAT10: /* pattern separator (|) */ | |||
| 478 | make_magic = 1; | |||
| 479 | c = '|'; | |||
| 480 | break; | |||
| 481 | ||||
| 482 | case CPAT11: /* close pattern */ | |||
| 483 | make_magic = 1; | |||
| 484 | c = /*(*/ ')'; | |||
| 485 | break; | |||
| 486 | } | |||
| 487 | break; | |||
| 488 | ||||
| 489 | case XNULLSUB5: | |||
| 490 | /* Special case for "$@" (and "${foo[@]}") - no | |||
| 491 | * word is generated if $# is 0 (unless there is | |||
| 492 | * other stuff inside the quotes). | |||
| 493 | */ | |||
| 494 | type = XBASE0; | |||
| 495 | if (f&DOBLANK(1<<(0))) { | |||
| 496 | doblank--; | |||
| 497 | if (dp == Xstring(ds, dp)((ds).beg) && word != IFS_WORD0) | |||
| 498 | word = IFS_IWS3; | |||
| 499 | } | |||
| 500 | continue; | |||
| 501 | ||||
| 502 | case XSUB1: | |||
| 503 | case XSUBMID6: | |||
| 504 | if ((c = *x.str++) == 0) { | |||
| 505 | type = XBASE0; | |||
| 506 | if (f&DOBLANK(1<<(0))) | |||
| 507 | doblank--; | |||
| 508 | continue; | |||
| 509 | } | |||
| 510 | break; | |||
| 511 | ||||
| 512 | case XARGSEP2: | |||
| 513 | type = XARG3; | |||
| 514 | quote = 1; | |||
| 515 | case XARG3: | |||
| 516 | if ((c = *x.str++) == '\0') { | |||
| 517 | /* force null words to be created so | |||
| 518 | * set -- '' 2 ''; foo "$@" will do | |||
| 519 | * the right thing | |||
| 520 | */ | |||
| 521 | if (quote && x.split) | |||
| 522 | word = IFS_WORD0; | |||
| 523 | if ((x.str = *x.u.strv++) == NULL((void *)0)) { | |||
| 524 | type = XBASE0; | |||
| 525 | if (f&DOBLANK(1<<(0))) | |||
| 526 | doblank--; | |||
| 527 | continue; | |||
| 528 | } | |||
| 529 | c = ifs0; | |||
| 530 | if (c == 0) { | |||
| 531 | if (quote && !x.split) | |||
| 532 | continue; | |||
| 533 | if (!quote && word == IFS_WS1) | |||
| 534 | continue; | |||
| 535 | /* this is so we don't terminate */ | |||
| 536 | c = ' '; | |||
| 537 | /* now force-emit a word */ | |||
| 538 | goto emit_word; | |||
| 539 | } | |||
| 540 | if (quote && x.split) { | |||
| 541 | /* terminate word for "$@" */ | |||
| 542 | type = XARGSEP2; | |||
| 543 | quote = 0; | |||
| 544 | } | |||
| 545 | } | |||
| 546 | break; | |||
| 547 | ||||
| 548 | case XCOM4: | |||
| 549 | if (x.u.shf == NULL((void *)0)) /* $(< ...) failed, fake EOF */ | |||
| 550 | c = EOF(-1); | |||
| 551 | else if (newlines) { /* Spit out saved nl's */ | |||
| 552 | c = '\n'; | |||
| 553 | --newlines; | |||
| 554 | } else { | |||
| 555 | while ((c = shf_getc(x.u.shf)((x.u.shf)->rnleft > 0 ? (x.u.shf)->rnleft--, *(x.u. shf)->rp++ : shf_getchar(x.u.shf))) == 0 || c == '\n') | |||
| 556 | if (c == '\n') | |||
| 557 | newlines++; /* Save newlines */ | |||
| 558 | if (newlines && c != EOF(-1)) { | |||
| 559 | shf_ungetc(c, x.u.shf); | |||
| 560 | c = '\n'; | |||
| 561 | --newlines; | |||
| 562 | } | |||
| 563 | } | |||
| 564 | if (c == EOF(-1)) { | |||
| 565 | newlines = 0; | |||
| 566 | if (x.u.shf != NULL((void *)0)) | |||
| 567 | shf_close(x.u.shf); | |||
| 568 | if (x.split) | |||
| 569 | subst_exstat = waitlast(); | |||
| 570 | else | |||
| 571 | subst_exstat = (x.u.shf == NULL((void *)0)); | |||
| 572 | type = XBASE0; | |||
| 573 | if (f&DOBLANK(1<<(0))) | |||
| 574 | doblank--; | |||
| 575 | continue; | |||
| 576 | } | |||
| 577 | break; | |||
| 578 | } | |||
| 579 | ||||
| 580 | /* check for end of word or IFS separation */ | |||
| 581 | if (c == 0 || (!quote && (f & DOBLANK(1<<(0))) && doblank && | |||
| 582 | !make_magic && ctype(c, C_IFS)!!(ctypes[(unsigned char)(c)]&((1<<(7)))))) { | |||
| 583 | /* How words are broken up: | |||
| 584 | * | value of c | |||
| 585 | * word | ws nws 0 | |||
| 586 | * ----------------------------------- | |||
| 587 | * IFS_WORD w/WS w/NWS w | |||
| 588 | * IFS_WS -/WS w/NWS - | |||
| 589 | * IFS_NWS -/NWS w/NWS - | |||
| 590 | * IFS_IWS -/WS w/NWS - | |||
| 591 | * (w means generate a word) | |||
| 592 | */ | |||
| 593 | if ((word == IFS_WORD0) || (word == IFS_QUOTE4) || (c && | |||
| 594 | (word == IFS_IWS3 || word == IFS_NWS2) && | |||
| 595 | !ctype(c, C_IFSWS)!!(ctypes[(unsigned char)(c)]&((1<<(4)))))) { | |||
| 596 | char *p; | |||
| 597 | emit_word: | |||
| 598 | *dp++ = '\0'; | |||
| 599 | p = Xclose(ds, dp)aresize((ds).beg, ((dp) - (ds).beg), (ds).areap); | |||
| 600 | if (fdo & DOBRACE_(1<<(6))) | |||
| 601 | /* also does globbing */ | |||
| 602 | alt_expand(wp, p, p, | |||
| 603 | p + Xlength(ds, (dp - 1))(((dp - 1)) - (ds).beg), | |||
| 604 | fdo | (f & DOMARKDIRS(1<<(10)))); | |||
| 605 | else if (fdo & DOGLOB(1<<(1))) | |||
| 606 | glob(p, wp, f & DOMARKDIRS(1<<(10))); | |||
| 607 | else if ((f & DOPAT(1<<(2))) || !(fdo & DOMAGIC_(1<<(7)))) | |||
| 608 | XPput(*wp, p)do { if ((*wp).cur >= (*wp).end) { int n = ((*wp).cur - (* wp).beg); (*wp).beg = areallocarray((*wp).beg, n, 2 * sizeof( void *), &genv->area); (*wp).cur = (*wp).beg + n; (*wp ).end = (*wp).cur + n; } *(*wp).cur++ = (p); } while (0); | |||
| 609 | else | |||
| 610 | XPput(*wp, debunk(p, p, strlen(p) + 1))do { if ((*wp).cur >= (*wp).end) { int n = ((*wp).cur - (* wp).beg); (*wp).beg = areallocarray((*wp).beg, n, 2 * sizeof( void *), &genv->area); (*wp).cur = (*wp).beg + n; (*wp ).end = (*wp).cur + n; } *(*wp).cur++ = (debunk(p, p, strlen( p) + 1)); } while (0); | |||
| 611 | fdo = 0; | |||
| 612 | saw_eq = 0; | |||
| 613 | tilde_ok = (f & (DOTILDE(1<<(3))|DOASNTILDE(1<<(5)))) ? 1 : 0; | |||
| 614 | if (c != 0) | |||
| 615 | Xinit(ds, dp, 128, ATEMP)do { (ds).len = 128; (ds).areap = (&genv->area); (ds). beg = alloc((ds).len + 8, (ds).areap); (ds).end = (ds).beg + ( ds).len; dp = (ds).beg; } while (0); | |||
| 616 | } | |||
| 617 | if (c == 0) | |||
| 618 | goto done; | |||
| 619 | if (word != IFS_NWS2) | |||
| 620 | word = ctype(c, C_IFSWS)!!(ctypes[(unsigned char)(c)]&((1<<(4)))) ? IFS_WS1 : IFS_NWS2; | |||
| 621 | } else { | |||
| 622 | if (type == XSUB1) { | |||
| 623 | if (word == IFS_NWS2 && | |||
| 624 | Xlength(ds, dp)((dp) - (ds).beg) == 0) { | |||
| 625 | char *p; | |||
| 626 | ||||
| 627 | if ((p = strdup("")) == NULL((void *)0)) | |||
| 628 | internal_errorf("unable " | |||
| 629 | "to allocate memory"); | |||
| 630 | XPput(*wp, p)do { if ((*wp).cur >= (*wp).end) { int n = ((*wp).cur - (* wp).beg); (*wp).beg = areallocarray((*wp).beg, n, 2 * sizeof( void *), &genv->area); (*wp).cur = (*wp).beg + n; (*wp ).end = (*wp).cur + n; } *(*wp).cur++ = (p); } while (0); | |||
| 631 | } | |||
| 632 | type = XSUBMID6; | |||
| 633 | } | |||
| 634 | ||||
| 635 | /* age tilde_ok info - ~ code tests second bit */ | |||
| 636 | tilde_ok <<= 1; | |||
| 637 | /* mark any special second pass chars */ | |||
| 638 | if (!quote) | |||
| 639 | switch (c) { | |||
| 640 | case '[': | |||
| 641 | case '!': | |||
| 642 | case '-': | |||
| 643 | case ']': | |||
| 644 | /* For character classes - doesn't hurt | |||
| 645 | * to have magic !,-,]'s outside of | |||
| 646 | * [...] expressions. | |||
| 647 | */ | |||
| 648 | if (f & (DOPAT(1<<(2)) | DOGLOB(1<<(1)))) { | |||
| 649 | fdo |= DOMAGIC_(1<<(7)); | |||
| 650 | if (c == '[') | |||
| 651 | fdo |= f & DOGLOB(1<<(1)); | |||
| 652 | *dp++ = MAGIC(7); | |||
| 653 | } | |||
| 654 | break; | |||
| 655 | case '*': | |||
| 656 | case '?': | |||
| 657 | if (f & (DOPAT(1<<(2)) | DOGLOB(1<<(1)))) { | |||
| 658 | fdo |= DOMAGIC_(1<<(7)) | (f & DOGLOB(1<<(1))); | |||
| 659 | *dp++ = MAGIC(7); | |||
| 660 | } | |||
| 661 | break; | |||
| 662 | case OBRACE'{': | |||
| 663 | case ',': | |||
| 664 | case CBRACE'}': | |||
| 665 | if ((f & DOBRACE_(1<<(6))) && (c == OBRACE'{' || | |||
| 666 | (fdo & DOBRACE_(1<<(6))))) { | |||
| 667 | fdo |= DOBRACE_(1<<(6))|DOMAGIC_(1<<(7)); | |||
| 668 | *dp++ = MAGIC(7); | |||
| 669 | } | |||
| 670 | break; | |||
| 671 | case '=': | |||
| 672 | /* Note first unquoted = for ~ */ | |||
| 673 | if (!(f & DOTEMP_(1<<(8))) && !saw_eq) { | |||
| 674 | saw_eq = 1; | |||
| 675 | tilde_ok = 1; | |||
| 676 | } | |||
| 677 | break; | |||
| 678 | case ':': /* : */ | |||
| 679 | /* Note unquoted : for ~ */ | |||
| 680 | if (!(f & DOTEMP_(1<<(8))) && (f & DOASNTILDE(1<<(5)))) | |||
| 681 | tilde_ok = 1; | |||
| 682 | break; | |||
| 683 | case '~': | |||
| 684 | /* tilde_ok is reset whenever | |||
| 685 | * any of ' " $( $(( ${ } are seen. | |||
| 686 | * Note that tilde_ok must be preserved | |||
| 687 | * through the sequence ${A=a=}~ | |||
| 688 | */ | |||
| 689 | if (type == XBASE0 && | |||
| 690 | (f & (DOTILDE(1<<(3))|DOASNTILDE(1<<(5)))) && | |||
| 691 | (tilde_ok & 2)) { | |||
| 692 | char *p, *dp_x; | |||
| 693 | ||||
| 694 | dp_x = dp; | |||
| 695 | p = maybe_expand_tilde(sp, | |||
| 696 | &ds, &dp_x, | |||
| 697 | f & DOASNTILDE(1<<(5))); | |||
| 698 | if (p) { | |||
| 699 | if (dp != dp_x) | |||
| 700 | word = IFS_WORD0; | |||
| 701 | dp = dp_x; | |||
| 702 | sp = p; | |||
| 703 | continue; | |||
| 704 | } | |||
| 705 | } | |||
| 706 | break; | |||
| 707 | } | |||
| 708 | else | |||
| 709 | quote &= ~2; /* undo temporary */ | |||
| 710 | ||||
| 711 | if (make_magic) { | |||
| 712 | make_magic = 0; | |||
| 713 | fdo |= DOMAGIC_(1<<(7)) | (f & DOGLOB(1<<(1))); | |||
| 714 | *dp++ = MAGIC(7); | |||
| 715 | } else if (ISMAGIC(c)((unsigned char)(c) == (7))) { | |||
| 716 | fdo |= DOMAGIC_(1<<(7)); | |||
| 717 | *dp++ = MAGIC(7); | |||
| 718 | } | |||
| 719 | *dp++ = c; /* save output char */ | |||
| 720 | word = IFS_WORD0; | |||
| 721 | } | |||
| 722 | } | |||
| 723 | ||||
| 724 | done: | |||
| 725 | for (st = &st_head; st != NULL((void *)0); st = st->next) { | |||
| 726 | if (st->var == NULL((void *)0) || (st->var->flag & RDONLY(1<<(10))) == 0) | |||
| 727 | continue; | |||
| 728 | ||||
| 729 | afree(st->var, ATEMP&genv->area); | |||
| 730 | } | |||
| 731 | } | |||
| 732 | ||||
| 733 | /* | |||
| 734 | * Prepare to generate the string returned by ${} substitution. | |||
| 735 | */ | |||
| 736 | static int | |||
| 737 | varsub(Expand *xp, char *sp, char *word, | |||
| 738 | int *stypep, /* becomes qualifier type */ | |||
| 739 | int *slenp) /* " " len (=, :=, etc.) valid iff *stypep != 0 */ | |||
| 740 | { | |||
| 741 | int c; | |||
| 742 | int state; /* next state: XBASE, XARG, XSUB, XNULLSUB */ | |||
| 743 | int stype; /* substitution type */ | |||
| 744 | int slen; | |||
| 745 | char *p; | |||
| 746 | struct tbl *vp; | |||
| 747 | int zero_ok = 0; | |||
| 748 | ||||
| 749 | if (sp[0] == '\0') /* Bad variable name */ | |||
| 750 | return -1; | |||
| 751 | ||||
| 752 | xp->var = NULL((void *)0); | |||
| 753 | ||||
| 754 | /* ${#var}, string length or array size */ | |||
| 755 | if (sp[0] == '#' && (c = sp[1]) != '\0') { | |||
| 756 | /* Can't have any modifiers for ${#...} */ | |||
| 757 | if (*word != CSUBST8) | |||
| 758 | return -1; | |||
| 759 | sp++; | |||
| 760 | /* Check for size of array */ | |||
| 761 | if ((p=strchr(sp,'[')) && (p[1]=='*'||p[1]=='@') && p[2]==']') { | |||
| 762 | int n = 0; | |||
| 763 | ||||
| 764 | vp = global(arrayname(sp)); | |||
| 765 | if (vp->flag & (ISSET(1<<(2))|ARRAY(1<<(13)))) | |||
| 766 | zero_ok = 1; | |||
| 767 | for (; vp; vp = vp->u.array) | |||
| 768 | if (vp->flag & ISSET(1<<(2))) | |||
| 769 | n++; | |||
| 770 | c = n; /* ksh88/ksh93 go for number, not max index */ | |||
| 771 | } else if (c == '*' || c == '@') | |||
| 772 | c = genv->loc->argc; | |||
| 773 | else { | |||
| 774 | p = str_val(global(sp)); | |||
| 775 | zero_ok = p != null; | |||
| 776 | c = strlen(p); | |||
| 777 | } | |||
| 778 | if (Flag(FNOUNSET)(shell_flags[(int) (FNOUNSET)]) && c == 0 && !zero_ok) | |||
| 779 | errorf("%s: parameter not set", sp); | |||
| 780 | *stypep = 0; /* unqualified variable/string substitution */ | |||
| 781 | xp->str = str_save(u64ton((uint64_t)c, 10), ATEMP&genv->area); | |||
| 782 | return XSUB1; | |||
| 783 | } | |||
| 784 | ||||
| 785 | /* Check for qualifiers in word part */ | |||
| 786 | stype = 0; | |||
| 787 | c = word[slen = 0] == CHAR1 ? word[1] : 0; | |||
| 788 | if (c == ':') { | |||
| 789 | slen += 2; | |||
| 790 | stype = 0x80; | |||
| 791 | c = word[slen + 0] == CHAR1 ? word[slen + 1] : 0; | |||
| 792 | } | |||
| 793 | if (ctype(c, C_SUBOP1)!!(ctypes[(unsigned char)(c)]&((1<<(5))))) { | |||
| 794 | slen += 2; | |||
| 795 | stype |= c; | |||
| 796 | } else if (ctype(c, C_SUBOP2)!!(ctypes[(unsigned char)(c)]&((1<<(6))))) { /* Note: ksh88 allows :%, :%%, etc */ | |||
| 797 | slen += 2; | |||
| 798 | stype = c; | |||
| 799 | if (word[slen + 0] == CHAR1 && c == word[slen + 1]) { | |||
| 800 | stype |= 0x80; | |||
| 801 | slen += 2; | |||
| 802 | } | |||
| 803 | } else if (stype) /* : is not ok */ | |||
| 804 | return -1; | |||
| 805 | if (!stype && *word != CSUBST8) | |||
| 806 | return -1; | |||
| 807 | *stypep = stype; | |||
| 808 | *slenp = slen; | |||
| 809 | ||||
| 810 | c = sp[0]; | |||
| 811 | if (c == '*' || c == '@') { | |||
| 812 | switch (stype & 0x7f) { | |||
| 813 | case '=': /* can't assign to a vector */ | |||
| 814 | case '%': /* can't trim a vector (yet) */ | |||
| 815 | case '#': | |||
| 816 | return -1; | |||
| 817 | } | |||
| 818 | if (genv->loc->argc == 0) { | |||
| 819 | xp->str = null; | |||
| 820 | xp->var = global(sp); | |||
| 821 | state = c == '@' ? XNULLSUB5 : XSUB1; | |||
| 822 | } else { | |||
| 823 | xp->u.strv = (const char **) genv->loc->argv + 1; | |||
| 824 | xp->str = *xp->u.strv++; | |||
| 825 | xp->split = c == '@'; /* $@ */ | |||
| 826 | state = XARG3; | |||
| 827 | } | |||
| 828 | zero_ok = 1; /* exempt "$@" and "$*" from 'set -u' */ | |||
| 829 | } else { | |||
| 830 | if ((p=strchr(sp,'[')) && (p[1]=='*'||p[1]=='@') && p[2]==']') { | |||
| 831 | XPtrV wv; | |||
| 832 | ||||
| 833 | switch (stype & 0x7f) { | |||
| 834 | case '=': /* can't assign to a vector */ | |||
| 835 | case '%': /* can't trim a vector (yet) */ | |||
| 836 | case '#': | |||
| 837 | case '?': | |||
| 838 | return -1; | |||
| 839 | } | |||
| 840 | XPinit(wv, 32)do { void **vp__; vp__ = areallocarray(((void *)0), 32, sizeof (void *), &genv->area); (wv).cur = (wv).beg = vp__; (wv ).end = vp__ + 32; } while (0); | |||
| 841 | vp = global(arrayname(sp)); | |||
| 842 | for (; vp; vp = vp->u.array) { | |||
| 843 | if (!(vp->flag&ISSET(1<<(2)))) | |||
| 844 | continue; | |||
| 845 | XPput(wv, str_val(vp))do { if ((wv).cur >= (wv).end) { int n = ((wv).cur - (wv). beg); (wv).beg = areallocarray((wv).beg, n, 2 * sizeof(void * ), &genv->area); (wv).cur = (wv).beg + n; (wv).end = ( wv).cur + n; } *(wv).cur++ = (str_val(vp)); } while (0); | |||
| 846 | } | |||
| 847 | if (XPsize(wv)((wv).cur - (wv).beg) == 0) { | |||
| 848 | xp->str = null; | |||
| 849 | state = p[1] == '@' ? XNULLSUB5 : XSUB1; | |||
| 850 | XPfree(wv)afree((wv).beg, &genv->area); | |||
| 851 | } else { | |||
| 852 | XPput(wv, 0)do { if ((wv).cur >= (wv).end) { int n = ((wv).cur - (wv). beg); (wv).beg = areallocarray((wv).beg, n, 2 * sizeof(void * ), &genv->area); (wv).cur = (wv).beg + n; (wv).end = ( wv).cur + n; } *(wv).cur++ = (0); } while (0); | |||
| 853 | xp->u.strv = (const char **) XPptrv(wv)((wv).beg); | |||
| 854 | xp->str = *xp->u.strv++; | |||
| 855 | xp->split = p[1] == '@'; /* ${foo[@]} */ | |||
| 856 | state = XARG3; | |||
| 857 | } | |||
| 858 | } else { | |||
| 859 | /* Can't assign things like $! or $1 */ | |||
| 860 | if ((stype & 0x7f) == '=' && | |||
| 861 | (ctype(*sp, C_VAR1)!!(ctypes[(unsigned char)(*sp)]&((1<<(3)))) || digit(*sp)isdigit((unsigned char)(*sp)))) | |||
| 862 | return -1; | |||
| 863 | xp->var = global(sp); | |||
| 864 | xp->str = str_val(xp->var); | |||
| 865 | state = XSUB1; | |||
| 866 | } | |||
| 867 | } | |||
| 868 | ||||
| 869 | c = stype&0x7f; | |||
| 870 | /* test the compiler's code generator */ | |||
| 871 | if (ctype(c, C_SUBOP2)!!(ctypes[(unsigned char)(c)]&((1<<(6)))) || | |||
| 872 | (((stype&0x80) ? *xp->str=='\0' : xp->str==null) ? /* undef? */ | |||
| 873 | c == '=' || c == '-' || c == '?' : c == '+')) | |||
| 874 | state = XBASE0; /* expand word instead of variable value */ | |||
| 875 | if (Flag(FNOUNSET)(shell_flags[(int) (FNOUNSET)]) && xp->str == null && !zero_ok && | |||
| 876 | (ctype(c, C_SUBOP2)!!(ctypes[(unsigned char)(c)]&((1<<(6)))) || (state != XBASE0 && c != '+'))) | |||
| 877 | errorf("%s: parameter not set", sp); | |||
| 878 | return state; | |||
| 879 | } | |||
| 880 | ||||
| 881 | /* | |||
| 882 | * Run the command in $(...) and read its output. | |||
| 883 | */ | |||
| 884 | static int | |||
| 885 | comsub(Expand *xp, char *cp) | |||
| 886 | { | |||
| 887 | Source *s, *sold; | |||
| 888 | struct op *t; | |||
| 889 | struct shf *shf; | |||
| 890 | ||||
| 891 | s = pushs(SSTRING3, ATEMP&genv->area); | |||
| 892 | s->start = s->str = cp; | |||
| 893 | sold = source; | |||
| 894 | t = compile(s); | |||
| 895 | afree(s, ATEMP&genv->area); | |||
| 896 | source = sold; | |||
| 897 | ||||
| 898 | if (t == NULL((void *)0)) | |||
| 899 | return XBASE0; | |||
| 900 | ||||
| 901 | if (t != NULL((void *)0) && t->type == TCOM1 && /* $(<file) */ | |||
| 902 | *t->args == NULL((void *)0) && *t->vars == NULL((void *)0) && t->ioact != NULL((void *)0)) { | |||
| 903 | struct ioword *io = *t->ioact; | |||
| 904 | char *name; | |||
| 905 | ||||
| 906 | if ((io->flag&IOTYPE0xF) != IOREAD0x1) | |||
| 907 | errorf("funny $() command: %s", | |||
| 908 | snptreef(NULL((void *)0), 32, "%R", io)); | |||
| 909 | shf = shf_open(name = evalstr(io->name, DOTILDE(1<<(3))), O_RDONLY0x0000, 0, | |||
| 910 | SHF_MAPHI0x0020|SHF_CLEXEC0x0010); | |||
| 911 | if (shf == NULL((void *)0)) | |||
| 912 | warningf(!Flag(FTALKING)(shell_flags[(int) (FTALKING)]), | |||
| 913 | "%s: %s", name, strerror(errno(*__errno()))); | |||
| 914 | xp->split = 0; /* no waitlast() */ | |||
| 915 | } else { | |||
| 916 | int ofd1, pv[2]; | |||
| 917 | openpipe(pv); | |||
| 918 | shf = shf_fdopen(pv[0], SHF_RD0x0001, NULL((void *)0)); | |||
| 919 | ofd1 = savefd(1); | |||
| 920 | if (pv[1] != 1) { | |||
| 921 | ksh_dup2(pv[1], 1, false0); | |||
| 922 | close(pv[1]); | |||
| 923 | } | |||
| 924 | execute(t, XFORK(1<<(1))|XXCOM(1<<(5))|XPIPEO(1<<(4)), NULL((void *)0)); | |||
| 925 | restfd(1, ofd1); | |||
| 926 | startlast(); | |||
| 927 | xp->split = 1; /* waitlast() */ | |||
| 928 | } | |||
| 929 | ||||
| 930 | xp->u.shf = shf; | |||
| 931 | return XCOM4; | |||
| 932 | } | |||
| 933 | ||||
| 934 | /* | |||
| 935 | * perform #pattern and %pattern substitution in ${} | |||
| 936 | */ | |||
| 937 | ||||
| 938 | static char * | |||
| 939 | trimsub(char *str, char *pat, int how) | |||
| 940 | { | |||
| 941 | char *end = strchr(str, 0); | |||
| 942 | char *p, c; | |||
| 943 | ||||
| 944 | switch (how&0xff) { /* UCHAR_MAX maybe? */ | |||
| 945 | case '#': /* shortest at beginning */ | |||
| 946 | for (p = str; p <= end; p++) { | |||
| 947 | c = *p; *p = '\0'; | |||
| 948 | if (gmatch(str, pat, false0)) { | |||
| 949 | *p = c; | |||
| 950 | return p; | |||
| 951 | } | |||
| 952 | *p = c; | |||
| 953 | } | |||
| 954 | break; | |||
| 955 | case '#'|0x80: /* longest match at beginning */ | |||
| 956 | for (p = end; p >= str; p--) { | |||
| 957 | c = *p; *p = '\0'; | |||
| 958 | if (gmatch(str, pat, false0)) { | |||
| 959 | *p = c; | |||
| 960 | return p; | |||
| 961 | } | |||
| 962 | *p = c; | |||
| 963 | } | |||
| 964 | break; | |||
| 965 | case '%': /* shortest match at end */ | |||
| 966 | for (p = end; p >= str; p--) { | |||
| 967 | if (gmatch(p, pat, false0)) | |||
| 968 | return str_nsave(str, p - str, ATEMP&genv->area); | |||
| 969 | } | |||
| 970 | break; | |||
| 971 | case '%'|0x80: /* longest match at end */ | |||
| 972 | for (p = str; p <= end; p++) { | |||
| 973 | if (gmatch(p, pat, false0)) | |||
| 974 | return str_nsave(str, p - str, ATEMP&genv->area); | |||
| 975 | } | |||
| 976 | break; | |||
| 977 | } | |||
| 978 | ||||
| 979 | return str; /* no match, return string */ | |||
| 980 | } | |||
| 981 | ||||
| 982 | /* | |||
| 983 | * glob | |||
| 984 | * Name derived from V6's /etc/glob, the program that expanded filenames. | |||
| 985 | */ | |||
| 986 | ||||
| 987 | /* XXX cp not const 'cause slashes are temporarily replaced with nulls... */ | |||
| 988 | static void | |||
| 989 | glob(char *cp, XPtrV *wp, int markdirs) | |||
| 990 | { | |||
| 991 | int oldsize = XPsize(*wp)((*wp).cur - (*wp).beg); | |||
| 992 | ||||
| 993 | if (glob_str(cp, wp, markdirs) == 0) | |||
| 994 | XPput(*wp, debunk(cp, cp, strlen(cp) + 1))do { if ((*wp).cur >= (*wp).end) { int n = ((*wp).cur - (* wp).beg); (*wp).beg = areallocarray((*wp).beg, n, 2 * sizeof( void *), &genv->area); (*wp).cur = (*wp).beg + n; (*wp ).end = (*wp).cur + n; } *(*wp).cur++ = (debunk(cp, cp, strlen (cp) + 1)); } while (0); | |||
| 995 | else | |||
| 996 | qsortp(XPptrv(*wp)((*wp).beg) + oldsize, (size_t)(XPsize(*wp)((*wp).cur - (*wp).beg) - oldsize), | |||
| 997 | xstrcmp); | |||
| 998 | } | |||
| 999 | ||||
| 1000 | #define GF_NONE0 0 | |||
| 1001 | #define GF_EXCHECK(1<<(0)) BIT(0)(1<<(0)) /* do existence check on file */ | |||
| 1002 | #define GF_GLOBBED(1<<(1)) BIT(1)(1<<(1)) /* some globbing has been done */ | |||
| 1003 | #define GF_MARKDIR(1<<(2)) BIT(2)(1<<(2)) /* add trailing / to directories */ | |||
| 1004 | ||||
| 1005 | /* Apply file globbing to cp and store the matching files in wp. Returns | |||
| 1006 | * the number of matches found. | |||
| 1007 | */ | |||
| 1008 | int | |||
| 1009 | glob_str(char *cp, XPtrV *wp, int markdirs) | |||
| 1010 | { | |||
| 1011 | int oldsize = XPsize(*wp)((*wp).cur - (*wp).beg); | |||
| 1012 | XString xs; | |||
| 1013 | char *xp; | |||
| 1014 | ||||
| 1015 | Xinit(xs, xp, 256, ATEMP)do { (xs).len = 256; (xs).areap = (&genv->area); (xs). beg = alloc((xs).len + 8, (xs).areap); (xs).end = (xs).beg + ( xs).len; xp = (xs).beg; } while (0); | |||
| 1016 | globit(&xs, &xp, cp, wp, markdirs ? GF_MARKDIR(1<<(2)) : GF_NONE0); | |||
| 1017 | Xfree(xs, xp)afree((xs).beg, (xs).areap); | |||
| 1018 | ||||
| 1019 | return XPsize(*wp)((*wp).cur - (*wp).beg) - oldsize; | |||
| 1020 | } | |||
| 1021 | ||||
| 1022 | static void | |||
| 1023 | globit(XString *xs, /* dest string */ | |||
| 1024 | char **xpp, /* ptr to dest end */ | |||
| 1025 | char *sp, /* source path */ | |||
| 1026 | XPtrV *wp, /* output list */ | |||
| 1027 | int check) /* GF_* flags */ | |||
| 1028 | { | |||
| 1029 | char *np; /* next source component */ | |||
| 1030 | char *xp = *xpp; | |||
| 1031 | char *se; | |||
| 1032 | char odirsep; | |||
| 1033 | ||||
| 1034 | /* This to allow long expansions to be interrupted */ | |||
| 1035 | intrcheck(); | |||
| 1036 | ||||
| 1037 | if (sp == NULL((void *)0)) { /* end of source path */ | |||
| 1038 | /* We only need to check if the file exists if a pattern | |||
| 1039 | * is followed by a non-pattern (eg, foo*x/bar; no check | |||
| 1040 | * is needed for foo* since the match must exist) or if | |||
| 1041 | * any patterns were expanded and the markdirs option is set. | |||
| 1042 | * Symlinks make things a bit tricky... | |||
| 1043 | */ | |||
| 1044 | if ((check & GF_EXCHECK(1<<(0))) || | |||
| 1045 | ((check & GF_MARKDIR(1<<(2))) && (check & GF_GLOBBED(1<<(1))))) { | |||
| 1046 | #define stat_check()(stat_done ? stat_done : (stat_done = stat(((*xs).beg), & statb) == -1 ? -1 : 1)) (stat_done ? stat_done : \ | |||
| 1047 | (stat_done = stat(Xstring(*xs, xp)((*xs).beg), &statb) == -1 \ | |||
| 1048 | ? -1 : 1)) | |||
| 1049 | struct stat lstatb, statb; | |||
| 1050 | int stat_done = 0; /* -1: failed, 1 ok */ | |||
| 1051 | ||||
| 1052 | if (lstat(Xstring(*xs, xp)((*xs).beg), &lstatb) == -1) | |||
| 1053 | return; | |||
| 1054 | /* special case for systems which strip trailing | |||
| 1055 | * slashes from regular files (eg, /etc/passwd/). | |||
| 1056 | * SunOS 4.1.3 does this... | |||
| 1057 | */ | |||
| 1058 | if ((check & GF_EXCHECK(1<<(0))) && xp > Xstring(*xs, xp)((*xs).beg) && | |||
| 1059 | xp[-1] == '/' && !S_ISDIR(lstatb.st_mode)((lstatb.st_mode & 0170000) == 0040000) && | |||
| 1060 | (!S_ISLNK(lstatb.st_mode)((lstatb.st_mode & 0170000) == 0120000) || | |||
| 1061 | stat_check()(stat_done ? stat_done : (stat_done = stat(((*xs).beg), & statb) == -1 ? -1 : 1)) < 0 || !S_ISDIR(statb.st_mode)((statb.st_mode & 0170000) == 0040000))) | |||
| 1062 | return; | |||
| 1063 | /* Possibly tack on a trailing / if there isn't already | |||
| 1064 | * one and if the file is a directory or a symlink to a | |||
| 1065 | * directory | |||
| 1066 | */ | |||
| 1067 | if (((check & GF_MARKDIR(1<<(2))) && (check & GF_GLOBBED(1<<(1)))) && | |||
| 1068 | xp > Xstring(*xs, xp)((*xs).beg) && xp[-1] != '/' && | |||
| 1069 | (S_ISDIR(lstatb.st_mode)((lstatb.st_mode & 0170000) == 0040000) || | |||
| 1070 | (S_ISLNK(lstatb.st_mode)((lstatb.st_mode & 0170000) == 0120000) && stat_check()(stat_done ? stat_done : (stat_done = stat(((*xs).beg), & statb) == -1 ? -1 : 1)) > 0 && | |||
| 1071 | S_ISDIR(statb.st_mode)((statb.st_mode & 0170000) == 0040000)))) { | |||
| 1072 | *xp++ = '/'; | |||
| 1073 | *xp = '\0'; | |||
| 1074 | } | |||
| 1075 | } | |||
| 1076 | XPput(*wp, str_nsave(Xstring(*xs, xp), Xlength(*xs, xp), ATEMP))do { if ((*wp).cur >= (*wp).end) { int n = ((*wp).cur - (* wp).beg); (*wp).beg = areallocarray((*wp).beg, n, 2 * sizeof( void *), &genv->area); (*wp).cur = (*wp).beg + n; (*wp ).end = (*wp).cur + n; } *(*wp).cur++ = (str_nsave(((*xs).beg ), ((xp) - (*xs).beg), &genv->area)); } while (0); | |||
| 1077 | return; | |||
| 1078 | } | |||
| 1079 | ||||
| 1080 | if (xp > Xstring(*xs, xp)((*xs).beg)) | |||
| 1081 | *xp++ = '/'; | |||
| 1082 | while (*sp == '/') { | |||
| 1083 | Xcheck(*xs, xp)do { ptrdiff_t more = ((xp) + (1)) - (*xs).end; if (more > 0) xp = Xcheck_grow_(&*xs, xp, more); } while (0); | |||
| 1084 | *xp++ = *sp++; | |||
| 1085 | } | |||
| 1086 | np = strchr(sp, '/'); | |||
| 1087 | if (np != NULL((void *)0)) { | |||
| 1088 | se = np; | |||
| 1089 | odirsep = *np; /* don't assume '/', can be multiple kinds */ | |||
| 1090 | *np++ = '\0'; | |||
| 1091 | } else { | |||
| 1092 | odirsep = '\0'; /* keep gcc quiet */ | |||
| 1093 | se = sp + strlen(sp); | |||
| 1094 | } | |||
| 1095 | ||||
| 1096 | ||||
| 1097 | /* Check if sp needs globbing - done to avoid pattern checks for strings | |||
| 1098 | * containing MAGIC characters, open ['s without the matching close ], | |||
| 1099 | * etc. (otherwise opendir() will be called which may fail because the | |||
| 1100 | * directory isn't readable - if no globbing is needed, only execute | |||
| 1101 | * permission should be required (as per POSIX)). | |||
| 1102 | */ | |||
| 1103 | if (!has_globbing(sp, se)) { | |||
| 1104 | XcheckN(*xs, xp, se - sp + 1)do { ptrdiff_t more = ((xp) + (se - sp + 1)) - (*xs).end; if ( more > 0) xp = Xcheck_grow_(&*xs, xp, more); } while ( 0); | |||
| 1105 | debunk(xp, sp, Xnleft(*xs, xp)((*xs).end - (xp))); | |||
| 1106 | xp += strlen(xp); | |||
| 1107 | *xpp = xp; | |||
| 1108 | globit(xs, xpp, np, wp, check); | |||
| 1109 | } else { | |||
| 1110 | DIR *dirp; | |||
| 1111 | struct dirent *d; | |||
| 1112 | char *name; | |||
| 1113 | int len; | |||
| 1114 | int prefix_len; | |||
| 1115 | ||||
| 1116 | *xp = '\0'; | |||
| 1117 | prefix_len = Xlength(*xs, xp)((xp) - (*xs).beg); | |||
| 1118 | dirp = opendir(prefix_len ? Xstring(*xs, xp)((*xs).beg) : "."); | |||
| 1119 | if (dirp == NULL((void *)0)) | |||
| 1120 | goto Nodir; | |||
| 1121 | while ((d = readdir(dirp)) != NULL((void *)0)) { | |||
| 1122 | name = d->d_name; | |||
| 1123 | if (name[0] == '.' && | |||
| 1124 | (name[1] == 0 || (name[1] == '.' && name[2] == 0))) | |||
| 1125 | continue; /* always ignore . and .. */ | |||
| 1126 | if ((*name == '.' && *sp != '.') || | |||
| 1127 | !gmatch(name, sp, true1)) | |||
| 1128 | continue; | |||
| 1129 | ||||
| 1130 | len = strlen(d->d_name) + 1; | |||
| 1131 | XcheckN(*xs, xp, len)do { ptrdiff_t more = ((xp) + (len)) - (*xs).end; if (more > 0) xp = Xcheck_grow_(&*xs, xp, more); } while (0); | |||
| 1132 | memcpy(xp, name, len); | |||
| 1133 | *xpp = xp + len - 1; | |||
| 1134 | globit(xs, xpp, np, wp, | |||
| 1135 | (check & GF_MARKDIR(1<<(2))) | GF_GLOBBED(1<<(1)) | |||
| 1136 | | (np ? GF_EXCHECK(1<<(0)) : GF_NONE0)); | |||
| 1137 | xp = Xstring(*xs, xp)((*xs).beg) + prefix_len; | |||
| 1138 | } | |||
| 1139 | closedir(dirp); | |||
| 1140 | Nodir:; | |||
| 1141 | } | |||
| 1142 | ||||
| 1143 | if (np != NULL((void *)0)) | |||
| 1144 | *--np = odirsep; | |||
| 1145 | } | |||
| 1146 | ||||
| 1147 | /* remove MAGIC from string */ | |||
| 1148 | char * | |||
| 1149 | debunk(char *dp, const char *sp, size_t dlen) | |||
| 1150 | { | |||
| 1151 | char *d, *s; | |||
| 1152 | ||||
| 1153 | if ((s = strchr(sp, MAGIC(7)))) { | |||
| 1154 | size_t slen = s - sp; | |||
| 1155 | if (slen >= dlen) | |||
| 1156 | return dp; | |||
| 1157 | memcpy(dp, sp, slen); | |||
| 1158 | for (d = dp + slen; *s && (d < dp + dlen); s++) | |||
| 1159 | if (!ISMAGIC(*s)((unsigned char)(*s) == (7)) || !(*++s & 0x80) || | |||
| 1160 | !strchr("*+?@! ", *s & 0x7f)) | |||
| 1161 | *d++ = *s; | |||
| 1162 | else { | |||
| 1163 | /* extended pattern operators: *+?@! */ | |||
| 1164 | if ((*s & 0x7f) != ' ') | |||
| 1165 | *d++ = *s & 0x7f; | |||
| 1166 | if (d < dp + dlen) | |||
| 1167 | *d++ = '('; | |||
| 1168 | } | |||
| 1169 | *d = '\0'; | |||
| 1170 | } else if (dp != sp) | |||
| 1171 | strlcpy(dp, sp, dlen); | |||
| 1172 | return dp; | |||
| 1173 | } | |||
| 1174 | ||||
| 1175 | /* Check if p is an unquoted name, possibly followed by a / or :. If so | |||
| 1176 | * puts the expanded version in *dcp,dp and returns a pointer in p just | |||
| 1177 | * past the name, otherwise returns 0. | |||
| 1178 | */ | |||
| 1179 | static char * | |||
| 1180 | maybe_expand_tilde(char *p, XString *dsp, char **dpp, int isassign) | |||
| 1181 | { | |||
| 1182 | XString ts; | |||
| 1183 | char *dp = *dpp; | |||
| 1184 | char *tp, *r; | |||
| 1185 | ||||
| 1186 | Xinit(ts, tp, 16, ATEMP)do { (ts).len = 16; (ts).areap = (&genv->area); (ts).beg = alloc((ts).len + 8, (ts).areap); (ts).end = (ts).beg + (ts ).len; tp = (ts).beg; } while (0); | |||
| 1187 | /* : only for DOASNTILDE form */ | |||
| 1188 | while (p[0] == CHAR1 && p[1] != '/' && (!isassign || p[1] != ':')) | |||
| 1189 | { | |||
| 1190 | Xcheck(ts, tp)do { ptrdiff_t more = ((tp) + (1)) - (ts).end; if (more > 0 ) tp = Xcheck_grow_(&ts, tp, more); } while (0); | |||
| 1191 | *tp++ = p[1]; | |||
| 1192 | p += 2; | |||
| 1193 | } | |||
| 1194 | *tp = '\0'; | |||
| 1195 | r = (p[0] == EOS0 || p[0] == CHAR1 || p[0] == CSUBST8) ? | |||
| 1196 | tilde(Xstring(ts, tp)((ts).beg)) : NULL((void *)0); | |||
| 1197 | Xfree(ts, tp)afree((ts).beg, (ts).areap); | |||
| 1198 | if (r) { | |||
| 1199 | while (*r) { | |||
| 1200 | Xcheck(*dsp, dp)do { ptrdiff_t more = ((dp) + (1)) - (*dsp).end; if (more > 0) dp = Xcheck_grow_(&*dsp, dp, more); } while (0); | |||
| 1201 | if (ISMAGIC(*r)((unsigned char)(*r) == (7))) | |||
| 1202 | *dp++ = MAGIC(7); | |||
| 1203 | *dp++ = *r++; | |||
| 1204 | } | |||
| 1205 | *dpp = dp; | |||
| 1206 | r = p; | |||
| 1207 | } | |||
| 1208 | return r; | |||
| 1209 | } | |||
| 1210 | ||||
| 1211 | /* | |||
| 1212 | * tilde expansion | |||
| 1213 | * | |||
| 1214 | * based on a version by Arnold Robbins | |||
| 1215 | */ | |||
| 1216 | ||||
| 1217 | static char * | |||
| 1218 | tilde(char *cp) | |||
| 1219 | { | |||
| 1220 | char *dp; | |||
| 1221 | ||||
| 1222 | if (cp[0] == '\0') | |||
| 1223 | dp = str_val(global("HOME")); | |||
| 1224 | else if (cp[0] == '+' && cp[1] == '\0') | |||
| 1225 | dp = str_val(global("PWD")); | |||
| 1226 | else if (cp[0] == '-' && cp[1] == '\0') | |||
| 1227 | dp = str_val(global("OLDPWD")); | |||
| 1228 | else | |||
| 1229 | dp = homedir(cp); | |||
| 1230 | /* If HOME, PWD or OLDPWD are not set, don't expand ~ */ | |||
| 1231 | if (dp == null) | |||
| 1232 | dp = NULL((void *)0); | |||
| 1233 | return dp; | |||
| 1234 | } | |||
| 1235 | ||||
| 1236 | /* | |||
| 1237 | * map userid to user's home directory. | |||
| 1238 | * note that 4.3's getpw adds more than 6K to the shell, | |||
| 1239 | * and the YP version probably adds much more. | |||
| 1240 | * we might consider our own version of getpwnam() to keep the size down. | |||
| 1241 | */ | |||
| 1242 | ||||
| 1243 | static char * | |||
| 1244 | homedir(char *name) | |||
| 1245 | { | |||
| 1246 | struct tbl *ap; | |||
| 1247 | ||||
| 1248 | ap = ktenter(&homedirs, name, hash(name)); | |||
| 1249 | if (!(ap->flag & ISSET(1<<(2)))) { | |||
| 1250 | struct passwd *pw; | |||
| 1251 | ||||
| 1252 | pw = getpwnam(name); | |||
| 1253 | if (pw == NULL((void *)0)) | |||
| 1254 | return NULL((void *)0); | |||
| 1255 | ap->val.s = str_save(pw->pw_dir, APERM&aperm); | |||
| 1256 | ap->flag |= DEFINED(1<<(1))|ISSET(1<<(2))|ALLOC(1<<(0)); | |||
| 1257 | } | |||
| 1258 | return ap->val.s; | |||
| 1259 | } | |||
| 1260 | ||||
| 1261 | static void | |||
| 1262 | alt_expand(XPtrV *wp, char *start, char *exp_start, char *end, int fdo) | |||
| 1263 | { | |||
| 1264 | int count = 0; | |||
| 1265 | char *brace_start, *brace_end, *comma = NULL((void *)0); | |||
| 1266 | char *field_start; | |||
| 1267 | char *p; | |||
| 1268 | ||||
| 1269 | /* search for open brace */ | |||
| 1270 | for (p = exp_start; (p = strchr(p, MAGIC(7))) && p[1] != OBRACE'{'; p += 2) | |||
| 1271 | ; | |||
| 1272 | brace_start = p; | |||
| 1273 | ||||
| 1274 | /* find matching close brace, if any */ | |||
| 1275 | if (p) { | |||
| 1276 | comma = NULL((void *)0); | |||
| 1277 | count = 1; | |||
| 1278 | for (p += 2; *p && count; p++) { | |||
| 1279 | if (ISMAGIC(*p)((unsigned char)(*p) == (7))) { | |||
| 1280 | if (*++p == OBRACE'{') | |||
| 1281 | count++; | |||
| 1282 | else if (*p == CBRACE'}') | |||
| 1283 | --count; | |||
| 1284 | else if (*p == ',' && count == 1) | |||
| 1285 | comma = p; | |||
| 1286 | } | |||
| 1287 | } | |||
| 1288 | } | |||
| 1289 | /* no valid expansions... */ | |||
| 1290 | if (!p || count != 0) { | |||
| 1291 | /* Note that given a{{b,c} we do not expand anything (this is | |||
| 1292 | * what at&t ksh does. This may be changed to do the {b,c} | |||
| 1293 | * expansion. } | |||
| 1294 | */ | |||
| 1295 | if (fdo & DOGLOB(1<<(1))) | |||
| 1296 | glob(start, wp, fdo & DOMARKDIRS(1<<(10))); | |||
| 1297 | else | |||
| 1298 | XPput(*wp, debunk(start, start, end - start))do { if ((*wp).cur >= (*wp).end) { int n = ((*wp).cur - (* wp).beg); (*wp).beg = areallocarray((*wp).beg, n, 2 * sizeof( void *), &genv->area); (*wp).cur = (*wp).beg + n; (*wp ).end = (*wp).cur + n; } *(*wp).cur++ = (debunk(start, start, end - start)); } while (0); | |||
| 1299 | return; | |||
| 1300 | } | |||
| 1301 | brace_end = p; | |||
| 1302 | if (!comma) { | |||
| 1303 | alt_expand(wp, start, brace_end, end, fdo); | |||
| 1304 | return; | |||
| 1305 | } | |||
| 1306 | ||||
| 1307 | /* expand expression */ | |||
| 1308 | field_start = brace_start + 2; | |||
| 1309 | count = 1; | |||
| 1310 | for (p = brace_start + 2; p != brace_end; p++) { | |||
| 1311 | if (ISMAGIC(*p)((unsigned char)(*p) == (7))) { | |||
| 1312 | if (*++p == OBRACE'{') | |||
| 1313 | count++; | |||
| 1314 | else if ((*p == CBRACE'}' && --count == 0) || | |||
| 1315 | (*p == ',' && count == 1)) { | |||
| 1316 | char *new; | |||
| 1317 | int l1, l2, l3; | |||
| 1318 | ||||
| 1319 | l1 = brace_start - start; | |||
| 1320 | l2 = (p - 1) - field_start; | |||
| 1321 | l3 = end - brace_end; | |||
| 1322 | new = alloc(l1 + l2 + l3 + 1, ATEMP&genv->area); | |||
| 1323 | memcpy(new, start, l1); | |||
| 1324 | memcpy(new + l1, field_start, l2); | |||
| 1325 | memcpy(new + l1 + l2, brace_end, l3); | |||
| 1326 | new[l1 + l2 + l3] = '\0'; | |||
| 1327 | alt_expand(wp, new, new + l1, | |||
| 1328 | new + l1 + l2 + l3, fdo); | |||
| 1329 | field_start = p + 1; | |||
| 1330 | } | |||
| 1331 | } | |||
| 1332 | } | |||
| 1333 | return; | |||
| 1334 | } | |||
| 1335 | ||||
| 1336 | /* | |||
| 1337 | * Copy the given variable if it's flagged as read-only. | |||
| 1338 | * Such variables have static storage and only one can therefore be referenced | |||
| 1339 | * at a time. | |||
| 1340 | * This is necessary in order to allow variable expansion expressions to refer | |||
| 1341 | * to multiple read-only variables. | |||
| 1342 | */ | |||
| 1343 | static struct tbl * | |||
| 1344 | varcpy(struct tbl *vp) | |||
| 1345 | { | |||
| 1346 | struct tbl *cpy; | |||
| 1347 | ||||
| 1348 | if (vp == NULL((void *)0) || (vp->flag & RDONLY(1<<(10))) == 0) | |||
| 1349 | return vp; | |||
| 1350 | ||||
| 1351 | cpy = alloc(sizeof(struct tbl), ATEMP&genv->area); | |||
| 1352 | memcpy(cpy, vp, sizeof(struct tbl)); | |||
| 1353 | return cpy; | |||
| 1354 | } |