1 /* $OpenBSD: tran.c,v 1.35 2022/06/03 19:46:09 millert Exp $ */ 2 /**************************************************************** 3 Copyright (C) Lucent Technologies 1997 4 All Rights Reserved 5 6 Permission to use, copy, modify, and distribute this software and 7 its documentation for any purpose and without fee is hereby 8 granted, provided that the above copyright notice appear in all 9 copies and that both that the copyright notice and this 10 permission notice and warranty disclaimer appear in supporting 11 documentation, and that the name Lucent Technologies or any of 12 its entities not be used in advertising or publicity pertaining 13 to distribution of the software without specific, written prior 14 permission. 15 16 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 17 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 18 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 19 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 21 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 22 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 23 THIS SOFTWARE. 24 ****************************************************************/ 25 26 #define DEBUG 27 #include <stdio.h> 28 #include <math.h> 29 #include <ctype.h> 30 #include <string.h> 31 #include <stdlib.h> 32 #include "awk.h" 33 34 #define FULLTAB 2 /* rehash when table gets this x full */ 35 #define GROWTAB 4 /* grow table by this factor */ 36 37 Array *symtab; /* main symbol table */ 38 39 char **FS; /* initial field sep */ 40 char **RS; /* initial record sep */ 41 char **OFS; /* output field sep */ 42 char **ORS; /* output record sep */ 43 char **OFMT; /* output format for numbers */ 44 char **CONVFMT; /* format for conversions in getsval */ 45 Awkfloat *NF; /* number of fields in current record */ 46 Awkfloat *NR; /* number of current record */ 47 Awkfloat *FNR; /* number of current record in current file */ 48 char **FILENAME; /* current filename argument */ 49 Awkfloat *ARGC; /* number of arguments from command line */ 50 char **SUBSEP; /* subscript separator for a[i,j,k]; default \034 */ 51 Awkfloat *RSTART; /* start of re matched with ~; origin 1 (!) */ 52 Awkfloat *RLENGTH; /* length of same */ 53 54 Cell *fsloc; /* FS */ 55 Cell *nrloc; /* NR */ 56 Cell *nfloc; /* NF */ 57 Cell *fnrloc; /* FNR */ 58 Cell *ofsloc; /* OFS */ 59 Cell *orsloc; /* ORS */ 60 Cell *rsloc; /* RS */ 61 Array *ARGVtab; /* symbol table containing ARGV[...] */ 62 Array *ENVtab; /* symbol table containing ENVIRON[...] */ 63 Cell *rstartloc; /* RSTART */ 64 Cell *rlengthloc; /* RLENGTH */ 65 Cell *subseploc; /* SUBSEP */ 66 Cell *symtabloc; /* SYMTAB */ 67 68 Cell *nullloc; /* a guaranteed empty cell */ 69 Node *nullnode; /* zero&null, converted into a node for comparisons */ 70 Cell *literal0; 71 72 extern Cell **fldtab; 73 74 void syminit(void) /* initialize symbol table with builtin vars */ 75 { 76 literal0 = setsymtab("0", "0", 0.0, NUM|STR|CON|DONTFREE, symtab); 77 /* this is used for if(x)... tests: */ 78 nullloc = setsymtab("$zero&null", "", 0.0, NUM|STR|CON|DONTFREE, symtab); 79 nullnode = celltonode(nullloc, CCON); 80 81 fsloc = setsymtab("FS", " ", 0.0, STR|DONTFREE, symtab); 82 FS = &fsloc->sval; 83 rsloc = setsymtab("RS", "\n", 0.0, STR|DONTFREE, symtab); 84 RS = &rsloc->sval; 85 ofsloc = setsymtab("OFS", " ", 0.0, STR|DONTFREE, symtab); 86 OFS = &ofsloc->sval; 87 orsloc = setsymtab("ORS", "\n", 0.0, STR|DONTFREE, symtab); 88 ORS = &orsloc->sval; 89 OFMT = &setsymtab("OFMT", "%.6g", 0.0, STR|DONTFREE, symtab)->sval; 90 CONVFMT = &setsymtab("CONVFMT", "%.6g", 0.0, STR|DONTFREE, symtab)->sval; 91 FILENAME = &setsymtab("FILENAME", "", 0.0, STR|DONTFREE, symtab)->sval; 92 nfloc = setsymtab("NF", "", 0.0, NUM, symtab); 93 NF = &nfloc->fval; 94 nrloc = setsymtab("NR", "", 0.0, NUM, symtab); 95 NR = &nrloc->fval; 96 fnrloc = setsymtab("FNR", "", 0.0, NUM, symtab); 97 FNR = &fnrloc->fval; 98 subseploc = setsymtab("SUBSEP", "\034", 0.0, STR|DONTFREE, symtab); 99 SUBSEP = &subseploc->sval; 100 rstartloc = setsymtab("RSTART", "", 0.0, NUM, symtab); 101 RSTART = &rstartloc->fval; 102 rlengthloc = setsymtab("RLENGTH", "", 0.0, NUM, symtab); 103 RLENGTH = &rlengthloc->fval; 104 symtabloc = setsymtab("SYMTAB", "", 0.0, ARR, symtab); 105 free(symtabloc->sval); 106 symtabloc->sval = (char *) symtab; 107 } 108 109 void arginit(int ac, char **av) /* set up ARGV and ARGC */ 110 { 111 Cell *cp; 112 int i; 113 char temp[50]; 114 115 ARGC = &setsymtab("ARGC", "", (Awkfloat) ac, NUM, symtab)->fval; 116 cp = setsymtab("ARGV", "", 0.0, ARR, symtab); 117 ARGVtab = makesymtab(NSYMTAB); /* could be (int) ARGC as well */ 118 free(cp->sval); 119 cp->sval = (char *) ARGVtab; 120 for (i = 0; i < ac; i++) { 121 double result; 122 123 snprintf(temp, sizeof temp, "%d", i); 124 if (is_number(*av, & result)) 125 setsymtab(temp, *av, result, STR|NUM, ARGVtab); 126 else 127 setsymtab(temp, *av, 0.0, STR, ARGVtab); 128 av++; 129 } 130 } 131 132 void envinit(char **envp) /* set up ENVIRON variable */ 133 { 134 Cell *cp; 135 char *p; 136 137 cp = setsymtab("ENVIRON", "", 0.0, ARR, symtab); 138 ENVtab = makesymtab(NSYMTAB); 139 free(cp->sval); 140 cp->sval = (char *) ENVtab; 141 for ( ; *envp; envp++) { 142 double result; 143 144 if ((p = strchr(*envp, '=')) == NULL) 145 continue; 146 if( p == *envp ) /* no left hand side name in env string */ 147 continue; 148 *p++ = 0; /* split into two strings at = */ 149 if (is_number(p, & result)) 150 setsymtab(*envp, p, result, STR|NUM, ENVtab); 151 else 152 setsymtab(*envp, p, 0.0, STR, ENVtab); 153 p[-1] = '='; /* restore in case env is passed down to a shell */ 154 } 155 } 156 157 Array *makesymtab(int n) /* make a new symbol table */ 158 { 159 Array *ap; 160 Cell **tp; 161 162 ap = (Array *) malloc(sizeof(*ap)); 163 tp = (Cell **) calloc(n, sizeof(*tp)); 164 if (ap == NULL || tp == NULL) 165 FATAL("out of space in makesymtab"); 166 ap->nelem = 0; 167 ap->size = n; 168 ap->tab = tp; 169 return(ap); 170 } 171 172 void freesymtab(Cell *ap) /* free a symbol table */ 173 { 174 Cell *cp, *temp; 175 Array *tp; 176 int i; 177 178 if (!isarr(ap)) 179 return; 180 tp = (Array *) ap->sval; 181 if (tp == NULL) 182 return; 183 for (i = 0; i < tp->size; i++) { 184 for (cp = tp->tab[i]; cp != NULL; cp = temp) { 185 xfree(cp->nval); 186 if (freeable(cp)) 187 xfree(cp->sval); 188 temp = cp->cnext; /* avoids freeing then using */ 189 free(cp); 190 tp->nelem--; 191 } 192 tp->tab[i] = NULL; 193 } 194 if (tp->nelem != 0) 195 WARNING("can't happen: inconsistent element count freeing %s", ap->nval); 196 free(tp->tab); 197 free(tp); 198 } 199 200 void freeelem(Cell *ap, const char *s) /* free elem s from ap (i.e., ap["s"] */ 201 { 202 Array *tp; 203 Cell *p, *prev = NULL; 204 int h; 205 206 tp = (Array *) ap->sval; 207 h = hash(s, tp->size); 208 for (p = tp->tab[h]; p != NULL; prev = p, p = p->cnext) 209 if (strcmp(s, p->nval) == 0) { 210 if (prev == NULL) /* 1st one */ 211 tp->tab[h] = p->cnext; 212 else /* middle somewhere */ 213 prev->cnext = p->cnext; 214 if (freeable(p)) 215 xfree(p->sval); 216 free(p->nval); 217 free(p); 218 tp->nelem--; 219 return; 220 } 221 } 222 223 Cell *setsymtab(const char *n, const char *s, Awkfloat f, unsigned t, Array *tp) 224 { 225 int h; 226 Cell *p; 227 228 if (n != NULL && (p = lookup(n, tp)) != NULL) { 229 DPRINTF("setsymtab found %p: n=%s s=\"%s\" f=%g t=%o\n", 230 (void*)p, NN(p->nval), NN(p->sval), p->fval, p->tval); 231 return(p); 232 } 233 p = (Cell *) malloc(sizeof(*p)); 234 if (p == NULL) 235 FATAL("out of space for symbol table at %s", n); 236 p->nval = tostring(n); 237 p->sval = s ? tostring(s) : tostring(""); 238 p->fval = f; 239 p->tval = t; 240 p->csub = CUNK; 241 p->ctype = OCELL; 242 tp->nelem++; 243 if (tp->nelem > FULLTAB * tp->size) 244 rehash(tp); 245 h = hash(n, tp->size); 246 p->cnext = tp->tab[h]; 247 tp->tab[h] = p; 248 DPRINTF("setsymtab set %p: n=%s s=\"%s\" f=%g t=%o\n", 249 (void*)p, p->nval, p->sval, p->fval, p->tval); 250 return(p); 251 } 252 253 int hash(const char *s, int n) /* form hash value for string s */ 254 { 255 unsigned hashval; 256 257 for (hashval = 0; *s != '\0'; s++) 258 hashval = (*s + 31 * hashval); 259 return hashval % n; 260 } 261 262 void rehash(Array *tp) /* rehash items in small table into big one */ 263 { 264 int i, nh, nsz; 265 Cell *cp, *op, **np; 266 267 nsz = GROWTAB * tp->size; 268 np = (Cell **) calloc(nsz, sizeof(*np)); 269 if (np == NULL) /* can't do it, but can keep running. */ 270 return; /* someone else will run out later. */ 271 for (i = 0; i < tp->size; i++) { 272 for (cp = tp->tab[i]; cp; cp = op) { 273 op = cp->cnext; 274 nh = hash(cp->nval, nsz); 275 cp->cnext = np[nh]; 276 np[nh] = cp; 277 } 278 } 279 free(tp->tab); 280 tp->tab = np; 281 tp->size = nsz; 282 } 283 284 Cell *lookup(const char *s, Array *tp) /* look for s in tp */ 285 { 286 Cell *p; 287 int h; 288 289 h = hash(s, tp->size); 290 for (p = tp->tab[h]; p != NULL; p = p->cnext) 291 if (strcmp(s, p->nval) == 0) 292 return(p); /* found it */ 293 return(NULL); /* not found */ 294 } 295 296 Awkfloat setfval(Cell *vp, Awkfloat f) /* set float val of a Cell */ 297 { 298 int fldno; 299 300 f += 0.0; /* normalise negative zero to positive zero */ 301 if ((vp->tval & (NUM | STR)) == 0) 302 funnyvar(vp, "assign to"); 303 if (isfld(vp)) { 304 donerec = false; /* mark $0 invalid */ 305 fldno = atoi(vp->nval); 306 if (fldno > *NF) 307 newfld(fldno); 308 DPRINTF("setting field %d to %g\n", fldno, f); 309 } else if (&vp->fval == NF) { 310 donerec = false; /* mark $0 invalid */ 311 setlastfld(f); 312 DPRINTF("setting NF to %g\n", f); 313 } else if (isrec(vp)) { 314 donefld = false; /* mark $1... invalid */ 315 donerec = true; 316 savefs(); 317 } else if (vp == ofsloc) { 318 if (!donerec) 319 recbld(); 320 } 321 if (freeable(vp)) 322 xfree(vp->sval); /* free any previous string */ 323 vp->tval &= ~(STR|CONVC|CONVO); /* mark string invalid */ 324 vp->fmt = NULL; 325 vp->tval |= NUM; /* mark number ok */ 326 if (f == -0) /* who would have thought this possible? */ 327 f = 0; 328 DPRINTF("setfval %p: %s = %g, t=%o\n", (void*)vp, NN(vp->nval), f, vp->tval); 329 return vp->fval = f; 330 } 331 332 void funnyvar(Cell *vp, const char *rw) 333 { 334 if (isarr(vp)) 335 FATAL("can't %s %s; it's an array name.", rw, vp->nval); 336 if (vp->tval & FCN) 337 FATAL("can't %s %s; it's a function.", rw, vp->nval); 338 WARNING("funny variable %p: n=%s s=\"%s\" f=%g t=%o", 339 (void *)vp, vp->nval, vp->sval, vp->fval, vp->tval); 340 } 341 342 char *setsval(Cell *vp, const char *s) /* set string val of a Cell */ 343 { 344 char *t; 345 int fldno; 346 Awkfloat f; 347 348 DPRINTF("starting setsval %p: %s = \"%s\", t=%o, r,f=%d,%d\n", 349 (void*)vp, NN(vp->nval), s, vp->tval, donerec, donefld); 350 if ((vp->tval & (NUM | STR)) == 0) 351 funnyvar(vp, "assign to"); 352 if (isfld(vp)) { 353 donerec = false; /* mark $0 invalid */ 354 fldno = atoi(vp->nval); 355 if (fldno > *NF) 356 newfld(fldno); 357 DPRINTF("setting field %d to %s (%p)\n", fldno, s, (const void*)s); 358 } else if (isrec(vp)) { 359 donefld = false; /* mark $1... invalid */ 360 donerec = true; 361 savefs(); 362 } else if (vp == ofsloc) { 363 if (!donerec) 364 recbld(); 365 } 366 t = s ? tostring(s) : tostring(""); /* in case it's self-assign */ 367 if (freeable(vp)) 368 xfree(vp->sval); 369 vp->tval &= ~(NUM|DONTFREE|CONVC|CONVO); 370 vp->tval |= STR; 371 vp->fmt = NULL; 372 DPRINTF("setsval %p: %s = \"%s (%p) \", t=%o r,f=%d,%d\n", 373 (void*)vp, NN(vp->nval), t, (void*)t, vp->tval, donerec, donefld); 374 vp->sval = t; 375 if (&vp->fval == NF) { 376 donerec = false; /* mark $0 invalid */ 377 f = getfval(vp); 378 setlastfld(f); 379 DPRINTF("setting NF to %g\n", f); 380 } 381 382 return(vp->sval); 383 } 384 385 Awkfloat getfval(Cell *vp) /* get float val of a Cell */ 386 { 387 if ((vp->tval & (NUM | STR)) == 0) 388 funnyvar(vp, "read value of"); 389 if (isfld(vp) && !donefld) 390 fldbld(); 391 else if (isrec(vp) && !donerec) 392 recbld(); 393 if (!isnum(vp)) { /* not a number */ 394 double fval; 395 bool no_trailing; 396 397 if (is_valid_number(vp->sval, true, & no_trailing, & fval)) { 398 vp->fval = fval; 399 if (no_trailing && !(vp->tval&CON)) 400 vp->tval |= NUM; /* make NUM only sparingly */ 401 } else 402 vp->fval = 0.0; 403 } 404 DPRINTF("getfval %p: %s = %g, t=%o\n", 405 (void*)vp, NN(vp->nval), vp->fval, vp->tval); 406 return(vp->fval); 407 } 408 409 static const char *get_inf_nan(double d) 410 { 411 if (isinf(d)) { 412 return (d < 0 ? "-inf" : "+inf"); 413 } else if (isnan(d)) { 414 return (signbit(d) != 0 ? "-nan" : "+nan"); 415 } else 416 return NULL; 417 } 418 419 static char *get_str_val(Cell *vp, char **fmt) /* get string val of a Cell */ 420 { 421 int n; 422 double dtemp; 423 const char *p; 424 425 if ((vp->tval & (NUM | STR)) == 0) 426 funnyvar(vp, "read value of"); 427 if (isfld(vp) && ! donefld) 428 fldbld(); 429 else if (isrec(vp) && ! donerec) 430 recbld(); 431 432 /* 433 * ADR: This is complicated and more fragile than is desirable. 434 * Retrieving a string value for a number associates the string 435 * value with the scalar. Previously, the string value was 436 * sticky, meaning if converted via OFMT that became the value 437 * (even though POSIX wants it to be via CONVFMT). Or if CONVFMT 438 * changed after a string value was retrieved, the original value 439 * was maintained and used. Also not per POSIX. 440 * 441 * We work around this design by adding two additional flags, 442 * CONVC and CONVO, indicating how the string value was 443 * obtained (via CONVFMT or OFMT) and _also_ maintaining a copy 444 * of the pointer to the xFMT format string used for the 445 * conversion. This pointer is only read, **never** dereferenced. 446 * The next time we do a conversion, if it's coming from the same 447 * xFMT as last time, and the pointer value is different, we 448 * know that the xFMT format string changed, and we need to 449 * redo the conversion. If it's the same, we don't have to. 450 * 451 * There are also several cases where we don't do a conversion, 452 * such as for a field (see the checks below). 453 */ 454 455 /* Don't duplicate the code for actually updating the value */ 456 #define update_str_val(vp) \ 457 { \ 458 if (freeable(vp)) \ 459 xfree(vp->sval); \ 460 if ((p = get_inf_nan(vp->fval)) != NULL) \ 461 n = (vp->sval = strdup(p)) ? 0 : -1; \ 462 else if (modf(vp->fval, &dtemp) == 0) /* it's integral */ \ 463 n = asprintf(&vp->sval, "%.30g", vp->fval); \ 464 else \ 465 n = asprintf(&vp->sval, *fmt, vp->fval); \ 466 if (n == -1) \ 467 FATAL("out of space in get_str_val"); \ 468 vp->tval &= ~DONTFREE; \ 469 vp->tval |= STR; \ 470 } 471 472 if (isstr(vp) == 0) { 473 update_str_val(vp); 474 if (fmt == OFMT) { 475 vp->tval &= ~CONVC; 476 vp->tval |= CONVO; 477 } else { 478 /* CONVFMT */ 479 vp->tval &= ~CONVO; 480 vp->tval |= CONVC; 481 } 482 vp->fmt = *fmt; 483 } else if ((vp->tval & DONTFREE) != 0 || ! isnum(vp) || isfld(vp)) { 484 goto done; 485 } else if (isstr(vp)) { 486 if (fmt == OFMT) { 487 if ((vp->tval & CONVC) != 0 488 || ((vp->tval & CONVO) != 0 && vp->fmt != *fmt)) { 489 update_str_val(vp); 490 vp->tval &= ~CONVC; 491 vp->tval |= CONVO; 492 vp->fmt = *fmt; 493 } 494 } else { 495 /* CONVFMT */ 496 if ((vp->tval & CONVO) != 0 497 || ((vp->tval & CONVC) != 0 && vp->fmt != *fmt)) { 498 update_str_val(vp); 499 vp->tval &= ~CONVO; 500 vp->tval |= CONVC; 501 vp->fmt = *fmt; 502 } 503 } 504 } 505 done: 506 DPRINTF("getsval %p: %s = \"%s (%p)\", t=%o\n", 507 (void*)vp, NN(vp->nval), vp->sval, (void*)vp->sval, vp->tval); 508 return(vp->sval); 509 } 510 511 char *getsval(Cell *vp) /* get string val of a Cell */ 512 { 513 return get_str_val(vp, CONVFMT); 514 } 515 516 char *getpssval(Cell *vp) /* get string val of a Cell for print */ 517 { 518 return get_str_val(vp, OFMT); 519 } 520 521 522 char *tostring(const char *s) /* make a copy of string s */ 523 { 524 char *p = strdup(s); 525 if (p == NULL) 526 FATAL("out of space in tostring on %s", s); 527 return(p); 528 } 529 530 char *tostringN(const char *s, size_t n) /* make a copy of string s */ 531 { 532 char *p; 533 534 p = (char *) malloc(n); 535 if (p == NULL) 536 FATAL("out of space in tostringN %zu", n); 537 if (strlcpy(p, s, n) >= n) 538 FATAL("out of space in tostringN on %s", s); 539 return(p); 540 } 541 542 Cell *catstr(Cell *a, Cell *b) /* concatenate a and b */ 543 { 544 Cell *c; 545 char *p; 546 char *sa = getsval(a); 547 char *sb = getsval(b); 548 size_t l = strlen(sa) + strlen(sb) + 1; 549 p = (char *) malloc(l); 550 if (p == NULL) 551 FATAL("out of space concatenating %s and %s", sa, sb); 552 snprintf(p, l, "%s%s", sa, sb); 553 554 l++; // add room for ' ' 555 char *newbuf = (char *) malloc(l); 556 if (newbuf == NULL) 557 FATAL("out of space concatenating %s and %s", sa, sb); 558 // See string() in lex.c; a string "xx" is stored in the symbol 559 // table as "xx ". 560 snprintf(newbuf, l, "%s ", p); 561 c = setsymtab(newbuf, p, 0.0, CON|STR|DONTFREE, symtab); 562 free(p); 563 free(newbuf); 564 return c; 565 } 566 567 char *qstring(const char *is, int delim) /* collect string up to next delim */ 568 { 569 const char *os = is; 570 int c, n; 571 const uschar *s = (const uschar *) is; 572 uschar *buf, *bp; 573 574 if ((buf = (uschar *) malloc(strlen(is)+3)) == NULL) 575 FATAL( "out of space in qstring(%s)", s); 576 for (bp = buf; (c = *s) != delim; s++) { 577 if (c == '\n') 578 SYNTAX( "newline in string %.20s...", os ); 579 else if (c != '\\') 580 *bp++ = c; 581 else { /* \something */ 582 c = *++s; 583 if (c == 0) { /* \ at end */ 584 *bp++ = '\\'; 585 break; /* for loop */ 586 } 587 switch (c) { 588 case '\\': *bp++ = '\\'; break; 589 case 'n': *bp++ = '\n'; break; 590 case 't': *bp++ = '\t'; break; 591 case 'b': *bp++ = '\b'; break; 592 case 'f': *bp++ = '\f'; break; 593 case 'r': *bp++ = '\r'; break; 594 case 'v': *bp++ = '\v'; break; 595 case 'a': *bp++ = '\a'; break; 596 default: 597 if (!isdigit(c)) { 598 *bp++ = c; 599 break; 600 } 601 n = c - '0'; 602 if (isdigit(s[1])) { 603 n = 8 * n + *++s - '0'; 604 if (isdigit(s[1])) 605 n = 8 * n + *++s - '0'; 606 } 607 *bp++ = n; 608 break; 609 } 610 } 611 } 612 *bp++ = 0; 613 return (char *) buf; 614 } 615 616 const char *flags2str(int flags) 617 { 618 static const struct ftab { 619 const char *name; 620 int value; 621 } flagtab[] = { 622 { "NUM", NUM }, 623 { "STR", STR }, 624 { "DONTFREE", DONTFREE }, 625 { "CON", CON }, 626 { "ARR", ARR }, 627 { "FCN", FCN }, 628 { "FLD", FLD }, 629 { "REC", REC }, 630 { "CONVC", CONVC }, 631 { "CONVO", CONVO }, 632 { NULL, 0 } 633 }; 634 static char buf[100]; 635 int i, len; 636 char *cp = buf; 637 638 for (i = 0; flagtab[i].name != NULL; i++) { 639 if ((flags & flagtab[i].value) != 0) { 640 len = snprintf(cp, sizeof(buf) - (cp - buf), 641 "%s%s", cp > buf ? "|" : "", flagtab[i].name); 642 if (len < 0 || len >= sizeof(buf) - (cp - buf)) 643 FATAL("out of space in flags2str"); 644 cp += len; 645 } 646 } 647 648 return buf; 649 } 650