1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93"; 40 #endif 41 static const char rcsid[] = 42 "$Id: vfprintf.c,v 1.16 1997/12/25 00:32:17 ache Exp $"; 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * Actual printf innards. 47 * 48 * This code is large and complicated... 49 */ 50 51 #include <sys/types.h> 52 53 #include <limits.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 58 #if __STDC__ 59 #include <stdarg.h> 60 #else 61 #include <varargs.h> 62 #endif 63 64 #include "local.h" 65 #include "fvwrite.h" 66 #ifdef _THREAD_SAFE 67 #include <pthread.h> 68 #include "pthread_private.h" 69 #endif 70 71 /* Define FLOATING_POINT to get floating point. */ 72 #define FLOATING_POINT 73 74 static int __sprint __P((FILE *, struct __suio *)); 75 static int __sbprintf __P((FILE *, const char *, va_list)); 76 static char * __ultoa __P((u_long, char *, int, int, char *)); 77 static char * __uqtoa __P((u_quad_t, char *, int, int, char *)); 78 static void __find_arguments __P((const char *, va_list, void ***)); 79 static void __grow_type_table __P((int, unsigned char **, int *)); 80 81 /* 82 * Flush out all the vectors defined by the given uio, 83 * then reset it so that it can be reused. 84 */ 85 static int 86 __sprint(fp, uio) 87 FILE *fp; 88 register struct __suio *uio; 89 { 90 register int err; 91 92 if (uio->uio_resid == 0) { 93 uio->uio_iovcnt = 0; 94 return (0); 95 } 96 err = __sfvwrite(fp, uio); 97 uio->uio_resid = 0; 98 uio->uio_iovcnt = 0; 99 return (err); 100 } 101 102 /* 103 * Helper function for `fprintf to unbuffered unix file': creates a 104 * temporary buffer. We only work on write-only files; this avoids 105 * worries about ungetc buffers and so forth. 106 */ 107 static int 108 __sbprintf(fp, fmt, ap) 109 register FILE *fp; 110 const char *fmt; 111 va_list ap; 112 { 113 int ret; 114 FILE fake; 115 unsigned char buf[BUFSIZ]; 116 117 /* copy the important variables */ 118 fake._flags = fp->_flags & ~__SNBF; 119 fake._file = fp->_file; 120 fake._cookie = fp->_cookie; 121 fake._write = fp->_write; 122 123 /* set up the buffer */ 124 fake._bf._base = fake._p = buf; 125 fake._bf._size = fake._w = sizeof(buf); 126 fake._lbfsize = 0; /* not actually used, but Just In Case */ 127 128 /* do the work, then copy any error status */ 129 ret = vfprintf(&fake, fmt, ap); 130 if (ret >= 0 && fflush(&fake)) 131 ret = EOF; 132 if (fake._flags & __SERR) 133 fp->_flags |= __SERR; 134 return (ret); 135 } 136 137 /* 138 * Macros for converting digits to letters and vice versa 139 */ 140 #define to_digit(c) ((c) - '0') 141 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 142 #define to_char(n) ((n) + '0') 143 144 /* 145 * Convert an unsigned long to ASCII for printf purposes, returning 146 * a pointer to the first character of the string representation. 147 * Octal numbers can be forced to have a leading zero; hex numbers 148 * use the given digits. 149 */ 150 static char * 151 __ultoa(val, endp, base, octzero, xdigs) 152 register u_long val; 153 char *endp; 154 int base, octzero; 155 char *xdigs; 156 { 157 register char *cp = endp; 158 register long sval; 159 160 /* 161 * Handle the three cases separately, in the hope of getting 162 * better/faster code. 163 */ 164 switch (base) { 165 case 10: 166 if (val < 10) { /* many numbers are 1 digit */ 167 *--cp = to_char(val); 168 return (cp); 169 } 170 /* 171 * On many machines, unsigned arithmetic is harder than 172 * signed arithmetic, so we do at most one unsigned mod and 173 * divide; this is sufficient to reduce the range of 174 * the incoming value to where signed arithmetic works. 175 */ 176 if (val > LONG_MAX) { 177 *--cp = to_char(val % 10); 178 sval = val / 10; 179 } else 180 sval = val; 181 do { 182 *--cp = to_char(sval % 10); 183 sval /= 10; 184 } while (sval != 0); 185 break; 186 187 case 8: 188 do { 189 *--cp = to_char(val & 7); 190 val >>= 3; 191 } while (val); 192 if (octzero && *cp != '0') 193 *--cp = '0'; 194 break; 195 196 case 16: 197 do { 198 *--cp = xdigs[val & 15]; 199 val >>= 4; 200 } while (val); 201 break; 202 203 default: /* oops */ 204 abort(); 205 } 206 return (cp); 207 } 208 209 /* Identical to __ultoa, but for quads. */ 210 static char * 211 __uqtoa(val, endp, base, octzero, xdigs) 212 register u_quad_t val; 213 char *endp; 214 int base, octzero; 215 char *xdigs; 216 { 217 register char *cp = endp; 218 register quad_t sval; 219 220 /* quick test for small values; __ultoa is typically much faster */ 221 /* (perhaps instead we should run until small, then call __ultoa?) */ 222 if (val <= ULONG_MAX) 223 return (__ultoa((u_long)val, endp, base, octzero, xdigs)); 224 switch (base) { 225 case 10: 226 if (val < 10) { 227 *--cp = to_char(val % 10); 228 return (cp); 229 } 230 if (val > QUAD_MAX) { 231 *--cp = to_char(val % 10); 232 sval = val / 10; 233 } else 234 sval = val; 235 do { 236 *--cp = to_char(sval % 10); 237 sval /= 10; 238 } while (sval != 0); 239 break; 240 241 case 8: 242 do { 243 *--cp = to_char(val & 7); 244 val >>= 3; 245 } while (val); 246 if (octzero && *cp != '0') 247 *--cp = '0'; 248 break; 249 250 case 16: 251 do { 252 *--cp = xdigs[val & 15]; 253 val >>= 4; 254 } while (val); 255 break; 256 257 default: 258 abort(); 259 } 260 return (cp); 261 } 262 263 #ifdef FLOATING_POINT 264 #include <math.h> 265 #include "floatio.h" 266 267 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ 268 #define DEFPREC 6 269 270 static char *cvt __P((double, int, int, char *, int *, int, int *)); 271 static int exponent __P((char *, int, int)); 272 273 #else /* no FLOATING_POINT */ 274 275 #define BUF 68 276 277 #endif /* FLOATING_POINT */ 278 279 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ 280 281 /* 282 * Flags used during conversion. 283 */ 284 #define ALT 0x001 /* alternate form */ 285 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 286 #define LADJUST 0x004 /* left adjustment */ 287 #define LONGDBL 0x008 /* long double */ 288 #define LONGINT 0x010 /* long integer */ 289 #define QUADINT 0x020 /* quad integer */ 290 #define SHORTINT 0x040 /* short integer */ 291 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 292 #define FPT 0x100 /* Floating point number */ 293 int 294 vfprintf(fp, fmt0, ap) 295 FILE *fp; 296 const char *fmt0; 297 va_list ap; 298 { 299 register char *fmt; /* format string */ 300 register int ch; /* character from fmt */ 301 register int n, n2; /* handy integer (short term usage) */ 302 register char *cp; /* handy char pointer (short term usage) */ 303 register struct __siov *iovp;/* for PRINT macro */ 304 register int flags; /* flags as above */ 305 int ret; /* return value accumulator */ 306 int width; /* width from format (%8d), or 0 */ 307 int prec; /* precision from format (%.3d), or -1 */ 308 char sign; /* sign prefix (' ', '+', '-', or \0) */ 309 #ifdef FLOATING_POINT 310 char softsign; /* temporary negative sign for floats */ 311 double _double; /* double precision arguments %[eEfgG] */ 312 int expt; /* integer value of exponent */ 313 int expsize; /* character count for expstr */ 314 int ndig; /* actual number of digits returned by cvt */ 315 char expstr[7]; /* buffer for exponent string */ 316 #endif 317 u_long ulval; /* integer arguments %[diouxX] */ 318 u_quad_t uqval; /* %q integers */ 319 int base; /* base for [diouxX] conversion */ 320 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 321 int realsz; /* field size expanded by dprec, sign, etc */ 322 int size; /* size of converted field or string */ 323 int prsize; /* max size of printed field */ 324 char *xdigs; /* digits for [xX] conversion */ 325 #define NIOV 8 326 struct __suio uio; /* output information: summary */ 327 struct __siov iov[NIOV];/* ... and individual io vectors */ 328 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ 329 char ox[2]; /* space for 0x hex-prefix */ 330 void **argtable; /* args, built due to positional arg */ 331 void *statargtable [STATIC_ARG_TBL_SIZE]; 332 int nextarg; /* 1-based argument index */ 333 va_list orgap; /* original argument pointer */ 334 335 /* 336 * Choose PADSIZE to trade efficiency vs. size. If larger printf 337 * fields occur frequently, increase PADSIZE and make the initialisers 338 * below longer. 339 */ 340 #define PADSIZE 16 /* pad chunk size */ 341 static char blanks[PADSIZE] = 342 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; 343 static char zeroes[PADSIZE] = 344 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; 345 346 /* 347 * BEWARE, these `goto error' on error, and PAD uses `n'. 348 */ 349 #define PRINT(ptr, len) { \ 350 iovp->iov_base = (ptr); \ 351 iovp->iov_len = (len); \ 352 uio.uio_resid += (len); \ 353 iovp++; \ 354 if (++uio.uio_iovcnt >= NIOV) { \ 355 if (__sprint(fp, &uio)) \ 356 goto error; \ 357 iovp = iov; \ 358 } \ 359 } 360 #define PAD(howmany, with) { \ 361 if ((n = (howmany)) > 0) { \ 362 while (n > PADSIZE) { \ 363 PRINT(with, PADSIZE); \ 364 n -= PADSIZE; \ 365 } \ 366 PRINT(with, n); \ 367 } \ 368 } 369 #define FLUSH() { \ 370 if (uio.uio_resid && __sprint(fp, &uio)) \ 371 goto error; \ 372 uio.uio_iovcnt = 0; \ 373 iovp = iov; \ 374 } 375 376 /* 377 * Get the argument indexed by nextarg. If the argument table is 378 * built, use it to get the argument. If its not, get the next 379 * argument (and arguments must be gotten sequentially). 380 */ 381 #define GETARG(type) \ 382 ((argtable != NULL) ? *((type*)(argtable[nextarg++])) : \ 383 (nextarg++, va_arg(ap, type))) 384 385 /* 386 * To extend shorts properly, we need both signed and unsigned 387 * argument extraction methods. 388 */ 389 #define SARG() \ 390 (flags&LONGINT ? GETARG(long) : \ 391 flags&SHORTINT ? (long)(short)GETARG(int) : \ 392 (long)GETARG(int)) 393 #define UARG() \ 394 (flags&LONGINT ? GETARG(u_long) : \ 395 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \ 396 (u_long)GETARG(u_int)) 397 398 /* 399 * Get * arguments, including the form *nn$. Preserve the nextarg 400 * that the argument can be gotten once the type is determined. 401 */ 402 #define GETASTER(val) \ 403 n2 = 0; \ 404 cp = fmt; \ 405 while (is_digit(*cp)) { \ 406 n2 = 10 * n2 + to_digit(*cp); \ 407 cp++; \ 408 } \ 409 if (*cp == '$') { \ 410 int hold = nextarg; \ 411 if (argtable == NULL) { \ 412 argtable = statargtable; \ 413 __find_arguments (fmt0, orgap, &argtable); \ 414 } \ 415 nextarg = n2; \ 416 val = GETARG (int); \ 417 nextarg = hold; \ 418 fmt = ++cp; \ 419 } else { \ 420 val = GETARG (int); \ 421 } 422 423 424 #ifdef _THREAD_SAFE 425 _thread_flockfile(fp,__FILE__,__LINE__); 426 #endif 427 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ 428 if (cantwrite(fp)) { 429 #ifdef _THREAD_SAFE 430 _thread_funlockfile(fp); 431 #endif 432 return (EOF); 433 } 434 435 /* optimise fprintf(stderr) (and other unbuffered Unix files) */ 436 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && 437 fp->_file >= 0) { 438 #ifdef _THREAD_SAFE 439 _thread_funlockfile(fp); 440 #endif 441 return (__sbprintf(fp, fmt0, ap)); 442 } 443 444 fmt = (char *)fmt0; 445 argtable = NULL; 446 nextarg = 1; 447 orgap = ap; 448 uio.uio_iov = iovp = iov; 449 uio.uio_resid = 0; 450 uio.uio_iovcnt = 0; 451 ret = 0; 452 453 /* 454 * Scan the format for conversions (`%' character). 455 */ 456 for (;;) { 457 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 458 /* void */; 459 if ((n = fmt - cp) != 0) { 460 if ((unsigned)ret + n > INT_MAX) { 461 ret = EOF; 462 goto error; 463 } 464 PRINT(cp, n); 465 ret += n; 466 } 467 if (ch == '\0') 468 goto done; 469 fmt++; /* skip over '%' */ 470 471 flags = 0; 472 dprec = 0; 473 width = 0; 474 prec = -1; 475 sign = '\0'; 476 477 rflag: ch = *fmt++; 478 reswitch: switch (ch) { 479 case ' ': 480 /* 481 * ``If the space and + flags both appear, the space 482 * flag will be ignored.'' 483 * -- ANSI X3J11 484 */ 485 if (!sign) 486 sign = ' '; 487 goto rflag; 488 case '#': 489 flags |= ALT; 490 goto rflag; 491 case '*': 492 /* 493 * ``A negative field width argument is taken as a 494 * - flag followed by a positive field width.'' 495 * -- ANSI X3J11 496 * They don't exclude field widths read from args. 497 */ 498 GETASTER (width); 499 if (width >= 0) 500 goto rflag; 501 width = -width; 502 /* FALLTHROUGH */ 503 case '-': 504 flags |= LADJUST; 505 goto rflag; 506 case '+': 507 sign = '+'; 508 goto rflag; 509 case '.': 510 if ((ch = *fmt++) == '*') { 511 GETASTER (n); 512 prec = n < 0 ? -1 : n; 513 goto rflag; 514 } 515 n = 0; 516 while (is_digit(ch)) { 517 n = 10 * n + to_digit(ch); 518 ch = *fmt++; 519 } 520 prec = n < 0 ? -1 : n; 521 goto reswitch; 522 case '0': 523 /* 524 * ``Note that 0 is taken as a flag, not as the 525 * beginning of a field width.'' 526 * -- ANSI X3J11 527 */ 528 flags |= ZEROPAD; 529 goto rflag; 530 case '1': case '2': case '3': case '4': 531 case '5': case '6': case '7': case '8': case '9': 532 n = 0; 533 do { 534 n = 10 * n + to_digit(ch); 535 ch = *fmt++; 536 } while (is_digit(ch)); 537 if (ch == '$') { 538 nextarg = n; 539 if (argtable == NULL) { 540 argtable = statargtable; 541 __find_arguments (fmt0, orgap, 542 &argtable); 543 } 544 goto rflag; 545 } 546 width = n; 547 goto reswitch; 548 #ifdef FLOATING_POINT 549 case 'L': 550 flags |= LONGDBL; 551 goto rflag; 552 #endif 553 case 'h': 554 flags |= SHORTINT; 555 goto rflag; 556 case 'l': 557 flags |= LONGINT; 558 goto rflag; 559 case 'q': 560 flags |= QUADINT; 561 goto rflag; 562 case 'c': 563 *(cp = buf) = GETARG(int); 564 size = 1; 565 sign = '\0'; 566 break; 567 case 'D': 568 flags |= LONGINT; 569 /*FALLTHROUGH*/ 570 case 'd': 571 case 'i': 572 if (flags & QUADINT) { 573 uqval = GETARG(quad_t); 574 if ((quad_t)uqval < 0) { 575 uqval = -uqval; 576 sign = '-'; 577 } 578 } else { 579 ulval = SARG(); 580 if ((long)ulval < 0) { 581 ulval = -ulval; 582 sign = '-'; 583 } 584 } 585 base = 10; 586 goto number; 587 #ifdef FLOATING_POINT 588 case 'e': 589 case 'E': 590 case 'f': 591 goto fp_begin; 592 case 'g': 593 case 'G': 594 if (prec == 0) 595 prec = 1; 596 fp_begin: if (prec == -1) 597 prec = DEFPREC; 598 if (flags & LONGDBL) 599 /* XXX this loses precision. */ 600 _double = (double)GETARG(long double); 601 else 602 _double = GETARG(double); 603 /* do this before tricky precision changes */ 604 if (isinf(_double)) { 605 if (_double < 0) 606 sign = '-'; 607 cp = "Inf"; 608 size = 3; 609 break; 610 } 611 if (isnan(_double)) { 612 cp = "NaN"; 613 size = 3; 614 break; 615 } 616 flags |= FPT; 617 cp = cvt(_double, prec, flags, &softsign, 618 &expt, ch, &ndig); 619 if (ch == 'g' || ch == 'G') { 620 if (expt <= -4 || expt > prec) 621 ch = (ch == 'g') ? 'e' : 'E'; 622 else 623 ch = 'g'; 624 } 625 if (ch <= 'e') { /* 'e' or 'E' fmt */ 626 --expt; 627 expsize = exponent(expstr, expt, ch); 628 size = expsize + ndig; 629 if (ndig > 1 || flags & ALT) 630 ++size; 631 } else if (ch == 'f') { /* f fmt */ 632 if (expt > 0) { 633 size = expt; 634 if (prec || flags & ALT) 635 size += prec + 1; 636 } else /* "0.X" */ 637 size = prec + 2; 638 } else if (expt >= ndig) { /* fixed g fmt */ 639 size = expt; 640 if (flags & ALT) 641 ++size; 642 } else 643 size = ndig + (expt > 0 ? 644 1 : 2 - expt); 645 646 if (softsign) 647 sign = '-'; 648 break; 649 #endif /* FLOATING_POINT */ 650 case 'n': 651 if (flags & QUADINT) 652 *GETARG(quad_t *) = ret; 653 else if (flags & LONGINT) 654 *GETARG(long *) = ret; 655 else if (flags & SHORTINT) 656 *GETARG(short *) = ret; 657 else 658 *GETARG(int *) = ret; 659 continue; /* no output */ 660 case 'O': 661 flags |= LONGINT; 662 /*FALLTHROUGH*/ 663 case 'o': 664 if (flags & QUADINT) 665 uqval = GETARG(u_quad_t); 666 else 667 ulval = UARG(); 668 base = 8; 669 goto nosign; 670 case 'p': 671 /* 672 * ``The argument shall be a pointer to void. The 673 * value of the pointer is converted to a sequence 674 * of printable characters, in an implementation- 675 * defined manner.'' 676 * -- ANSI X3J11 677 */ 678 ulval = (u_long)GETARG(void *); 679 base = 16; 680 xdigs = "0123456789abcdef"; 681 flags = (flags & ~QUADINT) | HEXPREFIX; 682 ch = 'x'; 683 goto nosign; 684 case 's': 685 if ((cp = GETARG(char *)) == NULL) 686 cp = "(null)"; 687 if (prec >= 0) { 688 /* 689 * can't use strlen; can only look for the 690 * NUL in the first `prec' characters, and 691 * strlen() will go further. 692 */ 693 char *p = memchr(cp, 0, (size_t)prec); 694 695 if (p != NULL) { 696 size = p - cp; 697 if (size > prec) 698 size = prec; 699 } else 700 size = prec; 701 } else 702 size = strlen(cp); 703 sign = '\0'; 704 break; 705 case 'U': 706 flags |= LONGINT; 707 /*FALLTHROUGH*/ 708 case 'u': 709 if (flags & QUADINT) 710 uqval = GETARG(u_quad_t); 711 else 712 ulval = UARG(); 713 base = 10; 714 goto nosign; 715 case 'X': 716 xdigs = "0123456789ABCDEF"; 717 goto hex; 718 case 'x': 719 xdigs = "0123456789abcdef"; 720 hex: if (flags & QUADINT) 721 uqval = GETARG(u_quad_t); 722 else 723 ulval = UARG(); 724 base = 16; 725 /* leading 0x/X only if non-zero */ 726 if (flags & ALT && 727 (flags & QUADINT ? uqval != 0 : ulval != 0)) 728 flags |= HEXPREFIX; 729 730 /* unsigned conversions */ 731 nosign: sign = '\0'; 732 /* 733 * ``... diouXx conversions ... if a precision is 734 * specified, the 0 flag will be ignored.'' 735 * -- ANSI X3J11 736 */ 737 number: if ((dprec = prec) >= 0) 738 flags &= ~ZEROPAD; 739 740 /* 741 * ``The result of converting a zero value with an 742 * explicit precision of zero is no characters.'' 743 * -- ANSI X3J11 744 */ 745 cp = buf + BUF; 746 if (flags & QUADINT) { 747 if (uqval != 0 || prec != 0) 748 cp = __uqtoa(uqval, cp, base, 749 flags & ALT, xdigs); 750 } else { 751 if (ulval != 0 || prec != 0) 752 cp = __ultoa(ulval, cp, base, 753 flags & ALT, xdigs); 754 } 755 size = buf + BUF - cp; 756 break; 757 default: /* "%?" prints ?, unless ? is NUL */ 758 if (ch == '\0') 759 goto done; 760 /* pretend it was %c with argument ch */ 761 cp = buf; 762 *cp = ch; 763 size = 1; 764 sign = '\0'; 765 break; 766 } 767 768 /* 769 * All reasonable formats wind up here. At this point, `cp' 770 * points to a string which (if not flags&LADJUST) should be 771 * padded out to `width' places. If flags&ZEROPAD, it should 772 * first be prefixed by any sign or other prefix; otherwise, 773 * it should be blank padded before the prefix is emitted. 774 * After any left-hand padding and prefixing, emit zeroes 775 * required by a decimal [diouxX] precision, then print the 776 * string proper, then emit zeroes required by any leftover 777 * floating precision; finally, if LADJUST, pad with blanks. 778 * 779 * Compute actual size, so we know how much to pad. 780 * size excludes decimal prec; realsz includes it. 781 */ 782 realsz = dprec > size ? dprec : size; 783 if (sign) 784 realsz++; 785 else if (flags & HEXPREFIX) 786 realsz += 2; 787 788 prsize = width > realsz ? width : realsz; 789 if ((unsigned)ret + prsize > INT_MAX) { 790 ret = EOF; 791 goto error; 792 } 793 794 /* right-adjusting blank padding */ 795 if ((flags & (LADJUST|ZEROPAD)) == 0) 796 PAD(width - realsz, blanks); 797 798 /* prefix */ 799 if (sign) { 800 PRINT(&sign, 1); 801 } else if (flags & HEXPREFIX) { 802 ox[0] = '0'; 803 ox[1] = ch; 804 PRINT(ox, 2); 805 } 806 807 /* right-adjusting zero padding */ 808 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) 809 PAD(width - realsz, zeroes); 810 811 /* leading zeroes from decimal precision */ 812 PAD(dprec - size, zeroes); 813 814 /* the string or number proper */ 815 #ifdef FLOATING_POINT 816 if ((flags & FPT) == 0) { 817 PRINT(cp, size); 818 } else { /* glue together f_p fragments */ 819 if (ch >= 'f') { /* 'f' or 'g' */ 820 if (_double == 0) { 821 /* kludge for __dtoa irregularity */ 822 if (expt >= ndig && 823 (flags & ALT) == 0) { 824 PRINT("0", 1); 825 } else { 826 PRINT("0.", 2); 827 PAD(ndig - 1, zeroes); 828 } 829 } else if (expt <= 0) { 830 PRINT("0.", 2); 831 PAD(-expt, zeroes); 832 PRINT(cp, ndig); 833 } else if (expt >= ndig) { 834 PRINT(cp, ndig); 835 PAD(expt - ndig, zeroes); 836 if (flags & ALT) 837 PRINT(".", 1); 838 } else { 839 PRINT(cp, expt); 840 cp += expt; 841 PRINT(".", 1); 842 PRINT(cp, ndig-expt); 843 } 844 } else { /* 'e' or 'E' */ 845 if (ndig > 1 || flags & ALT) { 846 ox[0] = *cp++; 847 ox[1] = '.'; 848 PRINT(ox, 2); 849 if (_double) { 850 PRINT(cp, ndig-1); 851 } else /* 0.[0..] */ 852 /* __dtoa irregularity */ 853 PAD(ndig - 1, zeroes); 854 } else /* XeYYY */ 855 PRINT(cp, 1); 856 PRINT(expstr, expsize); 857 } 858 } 859 #else 860 PRINT(cp, size); 861 #endif 862 /* left-adjusting padding (always blank) */ 863 if (flags & LADJUST) 864 PAD(width - realsz, blanks); 865 866 /* finally, adjust ret */ 867 ret += prsize; 868 869 FLUSH(); /* copy out the I/O vectors */ 870 } 871 done: 872 FLUSH(); 873 error: 874 if (__sferror(fp)) 875 ret = EOF; 876 #ifdef _THREAD_SAFE 877 _thread_funlockfile(fp); 878 #endif 879 if ((argtable != NULL) && (argtable != statargtable)) 880 free (argtable); 881 return (ret); 882 /* NOTREACHED */ 883 } 884 885 /* 886 * Type ids for argument type table. 887 */ 888 #define T_UNUSED 0 889 #define T_SHORT 1 890 #define T_U_SHORT 2 891 #define TP_SHORT 3 892 #define T_INT 4 893 #define T_U_INT 5 894 #define TP_INT 6 895 #define T_LONG 7 896 #define T_U_LONG 8 897 #define TP_LONG 9 898 #define T_QUAD 10 899 #define T_U_QUAD 11 900 #define TP_QUAD 12 901 #define T_DOUBLE 13 902 #define T_LONG_DOUBLE 14 903 #define TP_CHAR 15 904 #define TP_VOID 16 905 906 /* 907 * Find all arguments when a positional parameter is encountered. Returns a 908 * table, indexed by argument number, of pointers to each arguments. The 909 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. 910 * It will be replaces with a malloc-ed on if it overflows. 911 */ 912 static void 913 __find_arguments (fmt0, ap, argtable) 914 const char *fmt0; 915 va_list ap; 916 void ***argtable; 917 { 918 register char *fmt; /* format string */ 919 register int ch; /* character from fmt */ 920 register int n, n2; /* handy integer (short term usage) */ 921 register char *cp; /* handy char pointer (short term usage) */ 922 register int flags; /* flags as above */ 923 int width; /* width from format (%8d), or 0 */ 924 unsigned char *typetable; /* table of types */ 925 unsigned char stattypetable [STATIC_ARG_TBL_SIZE]; 926 int tablesize; /* current size of type table */ 927 int tablemax; /* largest used index in table */ 928 int nextarg; /* 1-based argument index */ 929 930 /* 931 * Add an argument type to the table, expanding if necessary. 932 */ 933 #define ADDTYPE(type) \ 934 ((nextarg >= tablesize) ? \ 935 __grow_type_table(nextarg, &typetable, &tablesize) : 0, \ 936 typetable[nextarg++] = type, \ 937 (nextarg > tablemax) ? tablemax = nextarg : 0) 938 939 #define ADDSARG() \ 940 ((flags&LONGINT) ? ADDTYPE(T_LONG) : \ 941 ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : ADDTYPE(T_INT))) 942 943 #define ADDUARG() \ 944 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \ 945 ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : ADDTYPE(T_U_INT))) 946 947 /* 948 * Add * arguments to the type array. 949 */ 950 #define ADDASTER() \ 951 n2 = 0; \ 952 cp = fmt; \ 953 while (is_digit(*cp)) { \ 954 n2 = 10 * n2 + to_digit(*cp); \ 955 cp++; \ 956 } \ 957 if (*cp == '$') { \ 958 int hold = nextarg; \ 959 nextarg = n2; \ 960 ADDTYPE (T_INT); \ 961 nextarg = hold; \ 962 fmt = ++cp; \ 963 } else { \ 964 ADDTYPE (T_INT); \ 965 } 966 fmt = (char *)fmt0; 967 typetable = stattypetable; 968 tablesize = STATIC_ARG_TBL_SIZE; 969 tablemax = 0; 970 nextarg = 1; 971 memset (typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); 972 973 /* 974 * Scan the format for conversions (`%' character). 975 */ 976 for (;;) { 977 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) 978 /* void */; 979 if (ch == '\0') 980 goto done; 981 fmt++; /* skip over '%' */ 982 983 flags = 0; 984 width = 0; 985 986 rflag: ch = *fmt++; 987 reswitch: switch (ch) { 988 case ' ': 989 case '#': 990 goto rflag; 991 case '*': 992 ADDASTER (); 993 goto rflag; 994 case '-': 995 case '+': 996 goto rflag; 997 case '.': 998 if ((ch = *fmt++) == '*') { 999 ADDASTER (); 1000 goto rflag; 1001 } 1002 while (is_digit(ch)) { 1003 ch = *fmt++; 1004 } 1005 goto reswitch; 1006 case '0': 1007 goto rflag; 1008 case '1': case '2': case '3': case '4': 1009 case '5': case '6': case '7': case '8': case '9': 1010 n = 0; 1011 do { 1012 n = 10 * n + to_digit(ch); 1013 ch = *fmt++; 1014 } while (is_digit(ch)); 1015 if (ch == '$') { 1016 nextarg = n; 1017 goto rflag; 1018 } 1019 width = n; 1020 goto reswitch; 1021 #ifdef FLOATING_POINT 1022 case 'L': 1023 flags |= LONGDBL; 1024 goto rflag; 1025 #endif 1026 case 'h': 1027 flags |= SHORTINT; 1028 goto rflag; 1029 case 'l': 1030 flags |= LONGINT; 1031 goto rflag; 1032 case 'q': 1033 flags |= QUADINT; 1034 goto rflag; 1035 case 'c': 1036 ADDTYPE(T_INT); 1037 break; 1038 case 'D': 1039 flags |= LONGINT; 1040 /*FALLTHROUGH*/ 1041 case 'd': 1042 case 'i': 1043 if (flags & QUADINT) { 1044 ADDTYPE(T_QUAD); 1045 } else { 1046 ADDSARG(); 1047 } 1048 break; 1049 #ifdef FLOATING_POINT 1050 case 'e': 1051 case 'E': 1052 case 'f': 1053 case 'g': 1054 case 'G': 1055 if (flags & LONGDBL) 1056 ADDTYPE(T_LONG_DOUBLE); 1057 else 1058 ADDTYPE(T_DOUBLE); 1059 break; 1060 #endif /* FLOATING_POINT */ 1061 case 'n': 1062 if (flags & QUADINT) 1063 ADDTYPE(TP_QUAD); 1064 else if (flags & LONGINT) 1065 ADDTYPE(TP_LONG); 1066 else if (flags & SHORTINT) 1067 ADDTYPE(TP_SHORT); 1068 else 1069 ADDTYPE(TP_INT); 1070 continue; /* no output */ 1071 case 'O': 1072 flags |= LONGINT; 1073 /*FALLTHROUGH*/ 1074 case 'o': 1075 if (flags & QUADINT) 1076 ADDTYPE(T_U_QUAD); 1077 else 1078 ADDUARG(); 1079 break; 1080 case 'p': 1081 ADDTYPE(TP_VOID); 1082 break; 1083 case 's': 1084 ADDTYPE(TP_CHAR); 1085 break; 1086 case 'U': 1087 flags |= LONGINT; 1088 /*FALLTHROUGH*/ 1089 case 'u': 1090 if (flags & QUADINT) 1091 ADDTYPE(T_U_QUAD); 1092 else 1093 ADDUARG(); 1094 break; 1095 case 'X': 1096 case 'x': 1097 if (flags & QUADINT) 1098 ADDTYPE(T_U_QUAD); 1099 else 1100 ADDUARG(); 1101 break; 1102 default: /* "%?" prints ?, unless ? is NUL */ 1103 if (ch == '\0') 1104 goto done; 1105 break; 1106 } 1107 } 1108 done: 1109 /* 1110 * Build the argument table. 1111 */ 1112 if (tablemax >= STATIC_ARG_TBL_SIZE) { 1113 *argtable = (void **) 1114 malloc (sizeof (void *) * (tablemax + 1)); 1115 } 1116 1117 (*argtable) [0] = NULL; 1118 for (n = 1; n <= tablemax; n++) { 1119 (*argtable) [n] = ap; 1120 switch (typetable [n]) { 1121 case T_UNUSED: 1122 (void) va_arg (ap, int); 1123 break; 1124 case T_SHORT: 1125 (void) va_arg (ap, int); 1126 break; 1127 case T_U_SHORT: 1128 (void) va_arg (ap, int); 1129 break; 1130 case TP_SHORT: 1131 (void) va_arg (ap, short *); 1132 break; 1133 case T_INT: 1134 (void) va_arg (ap, int); 1135 break; 1136 case T_U_INT: 1137 (void) va_arg (ap, unsigned int); 1138 break; 1139 case TP_INT: 1140 (void) va_arg (ap, int *); 1141 break; 1142 case T_LONG: 1143 (void) va_arg (ap, long); 1144 break; 1145 case T_U_LONG: 1146 (void) va_arg (ap, unsigned long); 1147 break; 1148 case TP_LONG: 1149 (void) va_arg (ap, long *); 1150 break; 1151 case T_QUAD: 1152 (void) va_arg (ap, quad_t); 1153 break; 1154 case T_U_QUAD: 1155 (void) va_arg (ap, u_quad_t); 1156 break; 1157 case TP_QUAD: 1158 (void) va_arg (ap, quad_t *); 1159 break; 1160 case T_DOUBLE: 1161 (void) va_arg (ap, double); 1162 break; 1163 case T_LONG_DOUBLE: 1164 (void) va_arg (ap, long double); 1165 break; 1166 case TP_CHAR: 1167 (void) va_arg (ap, char *); 1168 break; 1169 case TP_VOID: 1170 (void) va_arg (ap, void *); 1171 break; 1172 } 1173 } 1174 1175 if ((typetable != NULL) && (typetable != stattypetable)) 1176 free (typetable); 1177 } 1178 1179 /* 1180 * Increase the size of the type table. 1181 */ 1182 static void 1183 __grow_type_table (nextarg, typetable, tablesize) 1184 int nextarg; 1185 unsigned char **typetable; 1186 int *tablesize; 1187 { 1188 unsigned char *oldtable = *typetable; 1189 int newsize = *tablesize * 2; 1190 1191 if (*tablesize == STATIC_ARG_TBL_SIZE) { 1192 *typetable = (unsigned char *) 1193 malloc (sizeof (unsigned char) * newsize); 1194 bcopy (oldtable, *typetable, *tablesize); 1195 } else { 1196 *typetable = (unsigned char *) 1197 realloc (typetable, sizeof (unsigned char) * newsize); 1198 1199 } 1200 memset (&typetable [*tablesize], T_UNUSED, (newsize - *tablesize)); 1201 1202 *tablesize = newsize; 1203 } 1204 1205 1206 #ifdef FLOATING_POINT 1207 1208 extern char *__dtoa __P((double, int, int, int *, int *, char **)); 1209 1210 static char * 1211 cvt(value, ndigits, flags, sign, decpt, ch, length) 1212 double value; 1213 int ndigits, flags, *decpt, ch, *length; 1214 char *sign; 1215 { 1216 int mode, dsgn; 1217 char *digits, *bp, *rve; 1218 1219 if (ch == 'f') 1220 mode = 3; /* ndigits after the decimal point */ 1221 else { 1222 /* 1223 * To obtain ndigits after the decimal point for the 'e' 1224 * and 'E' formats, round to ndigits + 1 significant 1225 * figures. 1226 */ 1227 if (ch == 'e' || ch == 'E') 1228 ndigits++; 1229 mode = 2; /* ndigits significant digits */ 1230 } 1231 if (value < 0) { 1232 value = -value; 1233 *sign = '-'; 1234 } else 1235 *sign = '\000'; 1236 digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); 1237 if ((ch != 'g' && ch != 'G') || flags & ALT) { 1238 /* print trailing zeros */ 1239 bp = digits + ndigits; 1240 if (ch == 'f') { 1241 if (*digits == '0' && value) 1242 *decpt = -ndigits + 1; 1243 bp += *decpt; 1244 } 1245 if (value == 0) /* kludge for __dtoa irregularity */ 1246 rve = bp; 1247 while (rve < bp) 1248 *rve++ = '0'; 1249 } 1250 *length = rve - digits; 1251 return (digits); 1252 } 1253 1254 static int 1255 exponent(p0, exp, fmtch) 1256 char *p0; 1257 int exp, fmtch; 1258 { 1259 register char *p, *t; 1260 char expbuf[MAXEXP]; 1261 1262 p = p0; 1263 *p++ = fmtch; 1264 if (exp < 0) { 1265 exp = -exp; 1266 *p++ = '-'; 1267 } 1268 else 1269 *p++ = '+'; 1270 t = expbuf + MAXEXP; 1271 if (exp > 9) { 1272 do { 1273 *--t = to_char(exp % 10); 1274 } while ((exp /= 10) > 9); 1275 *--t = to_char(exp); 1276 for (; t < expbuf + MAXEXP; *p++ = *t++); 1277 } 1278 else { 1279 *p++ = '0'; 1280 *p++ = to_char(exp); 1281 } 1282 return (p - p0); 1283 } 1284 #endif /* FLOATING_POINT */ 1285