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 /*
38 * IMPORTANT NOTE:
39 * --------------
40 * From ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
41 * paragraph 3 above is now null and void.
42 */
43
44 /* SNPRINTF.C
45 * fjc 7-31-97 Modified by Mib Software to be a standalone snprintf.c module.
46 * http://www.mibsoftware.com
47 * Mib Software does not warrant this software any differently than the
48 * University of California, Berkeley as described above. All warranties
49 * are disclaimed. Use this software at your own risk.
50 *
51 * All code referencing FILE * functions was eliminated, since it could
52 * never be called. All header files and necessary files are collapsed
53 * into one file, internal functions are declared static. This should
54 * allow inclusion into libraries with less chance of namespace collisions.
55 *
56 * snprintf should be the only externally visible item.
57 *
58 * As of 7-31-97 FLOATING_POINT is NOT provided. The code is somewhat
59 * non-portable, so it is disabled.
60 */
61
62 /* Define FLOATING_POINT to get floating point. */
63 /*
64 #define FLOATING_POINT
65 */
66
67 #include <sys/types.h>
68 #define u_long unsigned long
69 #define u_short unsigned short
70 #define u_int unsigned int
71
72 #undef __P
73 #if defined(__STDC__)
74 # include <stdarg.h>
75 # if !defined(__P)
76 # define __P(x) x
77 # endif
78 #else
79 # define __P(x) ()
80 # if !defined(const)
81 # define const
82 # endif
83 # include <varargs.h>
84 #endif
85 #ifndef _BSD_VA_LIST_
86 #define _BSD_VA_LIST_ va_list
87 #endif
88
89 #ifdef __STDC__
90 # include <limits.h>
91 #else
92 # ifndef LONG_MAX
93 # ifdef HAVE_LIMITS_H
94 # include <limits.h>
95 # else
96 /* assuming 32bit(2's compliment) long */
97 # define LONG_MAX 2147483647
98 # endif
99 # endif
100 #endif
101
102 #if defined(__hpux) && !defined(__GNUC__)
103 #define const
104 #endif
105
106 #if defined(sgi)
107 #undef __const
108 #define __const
109 #endif /* People who don't like const sys_error */
110
111 #include <stddef.h>
112
113 #ifndef NULL
114 #define NULL 0
115 #endif
116
117 /*
118 * NB: to fit things in six character monocase externals, the stdio
119 * code uses the prefix `__s' for stdio objects, typically followed
120 * by a three-character attempt at a mnemonic.
121 */
122
123 /* stdio buffers */
124 struct __sbuf {
125 unsigned char *_base;
126 int _size;
127 };
128
129
130 /*
131 * stdio state variables.
132 *
133 * The following always hold:
134 *
135 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
136 * _lbfsize is -_bf._size, else _lbfsize is 0
137 * if _flags&__SRD, _w is 0
138 * if _flags&__SWR, _r is 0
139 *
140 * This ensures that the getc and putc macros (or inline functions) never
141 * try to write or read from a file that is in `read' or `write' mode.
142 * (Moreover, they can, and do, automatically switch from read mode to
143 * write mode, and back, on "r+" and "w+" files.)
144 *
145 * _lbfsize is used only to make the inline line-buffered output stream
146 * code as compact as possible.
147 *
148 * _ub, _up, and _ur are used when ungetc() pushes back more characters
149 * than fit in the current _bf, or when ungetc() pushes back a character
150 * that does not match the previous one in _bf. When this happens,
151 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
152 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
153 *
154 * NB: see WARNING above before changing the layout of this structure!
155 */
156 typedef struct __sFILE {
157 unsigned char *_p; /* current position in (some) buffer */
158 int _r; /* read space left for getc() */
159 int _w; /* write space left for putc() */
160 short _flags; /* flags, below; this FILE is free if 0 */
161 short _file; /* fileno, if Unix descriptor, else -1 */
162 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
163 int _lbfsize; /* 0 or -_bf._size, for inline putc */
164 } FILE;
165
166
167 #define __SLBF 0x0001 /* line buffered */
168 #define __SNBF 0x0002 /* unbuffered */
169 #define __SRD 0x0004 /* OK to read */
170 #define __SWR 0x0008 /* OK to write */
171 /* RD and WR are never simultaneously asserted */
172 #define __SRW 0x0010 /* open for reading & writing */
173 #define __SEOF 0x0020 /* found EOF */
174 #define __SERR 0x0040 /* found error */
175 #define __SMBF 0x0080 /* _buf is from malloc */
176 #define __SAPP 0x0100 /* fdopen()ed in append mode */
177 #define __SSTR 0x0200 /* this is an sprintf/snprintf string */
178 #define __SOPT 0x0400 /* do fseek() optimisation */
179 #define __SNPT 0x0800 /* do not do fseek() optimisation */
180 #define __SOFF 0x1000 /* set iff _offset is in fact correct */
181 #define __SMOD 0x2000 /* true => fgetln modified _p text */
182
183
184 #define EOF (-1)
185
186
187 #define __sfeof(p) (((p)->_flags & __SEOF) != 0)
188 #define __sferror(p) (((p)->_flags & __SERR) != 0)
189 #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
190 #define __sfileno(p) ((p)->_file)
191
192 #define feof(p) __sfeof(p)
193 #define ferror(p) __sferror(p)
194 #define clearerr(p) __sclearerr(p)
195
196 #ifndef _ANSI_SOURCE
197 #define fileno(p) __sfileno(p)
198 #endif
199
200
201 #if defined(__hpux) && !defined(__GNUC__) || defined(__DECC)
202 #include <string.h>
203 #endif
204
205 /*
206 * I/O descriptors for __sfvwrite().
207 */
208 struct __siov {
209 void *iov_base;
210 size_t iov_len;
211 };
212 struct __suio {
213 struct __siov *uio_iov;
214 int uio_iovcnt;
215 int uio_resid;
216 };
217
218 /*
219 * Write some memory regions. Return zero on success, EOF on error.
220 *
221 * This routine is large and unsightly, but most of the ugliness due
222 * to the three different kinds of output buffering is handled here.
223 */
BSD__sfvwrite(fp,uio)224 static BSD__sfvwrite(fp, uio)
225 register FILE *fp;
226 register struct __suio *uio;
227 {
228 register size_t len;
229 register char *p;
230 register struct __siov *iov;
231 register int w;
232
233 if ((len = uio->uio_resid) == 0)
234 return (0);
235 #ifndef __hpux
236 #define MIN(a, b) ((a) < (b) ? (a) : (b))
237 #endif
238 #define COPY(n) (void)memcpy((void *)fp->_p, (void *)p, (size_t)(n))
239
240 iov = uio->uio_iov;
241 p = iov->iov_base;
242 len = iov->iov_len;
243 iov++;
244 #define GETIOV(extra_work) \
245 while (len == 0) { \
246 extra_work; \
247 p = iov->iov_base; \
248 len = iov->iov_len; \
249 iov++; \
250 }
251 if (fp->_flags & __SNBF) {
252 /* fjc 7-31-97 Will never happen. We are working with
253 strings only
254 */
255 } else if ((fp->_flags & __SLBF) == 0) {
256 /*
257 * Fully buffered: fill partially full buffer, if any,
258 * and then flush. If there is no partial buffer, write
259 * one _bf._size byte chunk directly (without copying).
260 *
261 * String output is a special case: write as many bytes
262 * as fit, but pretend we wrote everything. This makes
263 * snprintf() return the number of bytes needed, rather
264 * than the number used, and avoids its write function
265 * (so that the write function can be invalid).
266 */
267 do {
268 GETIOV(;);
269 w = fp->_w;
270 if (fp->_flags & __SSTR) {
271 if (len < w)
272 w = len;
273 COPY(w); /* copy MIN(fp->_w,len), */
274 fp->_w -= w;
275 fp->_p += w;
276 w = len; /* but pretend copied all */
277 } else {
278 /* fjc 7-31-97 Will never happen. We are working with
279 strings only
280 */
281 }
282 p += w;
283 len -= w;
284 } while ((uio->uio_resid -= w) != 0);
285 } else {
286 /* fjc 7-31-97 Will never happen. We are working with
287 strings only
288 */
289 }
290 return (0);
291
292 err:
293 fp->_flags |= __SERR;
294 return (EOF);
295 }
296
297 /*
298 * Actual printf innards.
299 *
300 * This code is large and complicated...
301 */
302
303 #if !defined(__CYGWIN32__) && defined(__hpux) && !defined(__GNUC__)
304 #include <stdlib.h>
305 #endif
306
307 /*
308 * Flush out all the vectors defined by the given uio,
309 * then reset it so that it can be reused.
310 */
311 static int
BSD__sprint(fp,uio)312 BSD__sprint(fp, uio)
313 FILE *fp;
314 register struct __suio *uio;
315 {
316 register int err;
317
318 if (uio->uio_resid == 0) {
319 uio->uio_iovcnt = 0;
320 return (0);
321 }
322 err = BSD__sfvwrite(fp, uio);
323 uio->uio_resid = 0;
324 uio->uio_iovcnt = 0;
325 return (err);
326 }
327
328
329 /*
330 * Helper function for `fprintf to unbuffered unix file': creates a
331 * temporary buffer. We only work on write-only files; this avoids
332 * worries about ungetc buffers and so forth.
333 */
334 static int
BSD__sbprintf(fp,fmt,ap)335 BSD__sbprintf(fp, fmt, ap)
336 register FILE *fp;
337 const char *fmt;
338 va_list ap;
339 {
340 /* We don't support files. */
341 return 0;
342 }
343
344
345 /*
346 * Macros for converting digits to letters and vice versa
347 */
348 #define to_digit(c) ((c) - '0')
349 #define is_digit(c) ((unsigned)to_digit(c) <= 9)
350 #define to_char(n) ((n) + '0')
351
352 /*
353 * Convert an unsigned long to ASCII for printf purposes, returning
354 * a pointer to the first character of the string representation.
355 * Octal numbers can be forced to have a leading zero; hex numbers
356 * use the given digits.
357 */
358 static char *
BSD__ultoa(val,endp,base,octzero,xdigs)359 BSD__ultoa(val, endp, base, octzero, xdigs)
360 register u_long val;
361 char *endp;
362 int base, octzero;
363 char *xdigs;
364 {
365 register char *cp = endp;
366 register long sval;
367
368 /*
369 * Handle the three cases separately, in the hope of getting
370 * better/faster code.
371 */
372 switch (base) {
373 case 10:
374 if (val < 10) { /* many numbers are 1 digit */
375 *--cp = to_char(val);
376 return (cp);
377 }
378 /*
379 * On many machines, unsigned arithmetic is harder than
380 * signed arithmetic, so we do at most one unsigned mod and
381 * divide; this is sufficient to reduce the range of
382 * the incoming value to where signed arithmetic works.
383 */
384 if (val > LONG_MAX) {
385 *--cp = to_char(val % 10);
386 sval = val / 10;
387 } else
388 sval = val;
389 do {
390 *--cp = to_char(sval % 10);
391 sval /= 10;
392 } while (sval != 0);
393 break;
394
395 case 8:
396 do {
397 *--cp = to_char(val & 7);
398 val >>= 3;
399 } while (val);
400 if (octzero && *cp != '0')
401 *--cp = '0';
402 break;
403
404 case 16:
405 do {
406 *--cp = xdigs[val & 15];
407 val >>= 4;
408 } while (val);
409 break;
410
411 default: /* oops */
412 /*
413 abort();
414 */
415 break; /* fjc 7-31-97. Don't reference abort() here */
416 }
417 return (cp);
418 }
419
420 #ifdef FLOATING_POINT
421 #include <math.h>
422 /* #include "floatio.h" */
423
424 #ifndef MAXEXP
425 # define MAXEXP 1024
426 #endif
427
428 #ifndef MAXFRACT
429 # define MAXFRACT 64
430 #endif
431
432 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */
433 #define DEFPREC 6
434
435 static char *cvt __P((double, int, int, char *, int *, int, int *));
436 static int exponent __P((char *, int, int));
437
438 #else /* no FLOATING_POINT */
439
440 #define BUF 68
441
442 #endif /* FLOATING_POINT */
443
444
445 /*
446 * Flags used during conversion.
447 */
448 #define ALT 0x001 /* alternate form */
449 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */
450 #define LADJUST 0x004 /* left adjustment */
451 #define LONGDBL 0x008 /* long double; unimplemented */
452 #define LONGINT 0x010 /* long integer */
453
454 #ifdef _HAVE_SANE_QUAD_
455 #define QUADINT 0x020 /* quad integer */
456 #endif /* _HAVE_SANE_QUAD_ */
457
458 #define SHORTINT 0x040 /* short integer */
459 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */
460 #define FPT 0x100 /* Floating point number */
461 static int
BSD_vfprintf(fp,fmt0,ap)462 BSD_vfprintf(fp, fmt0, ap)
463 FILE *fp;
464 const char *fmt0;
465 va_list ap;
466 {
467 register char *fmt; /* format string */
468 register int ch; /* character from fmt */
469 register int n; /* handy integer (short term usage) */
470 register char *cp; /* handy char pointer (short term usage) */
471 register struct __siov *iovp;/* for PRINT macro */
472 register int flags; /* flags as above */
473 int ret; /* return value accumulator */
474 int width; /* width from format (%8d), or 0 */
475 int prec; /* precision from format (%.3d), or -1 */
476 char sign; /* sign prefix (' ', '+', '-', or \0) */
477 #ifdef FLOATING_POINT
478 char softsign; /* temporary negative sign for floats */
479 double _double; /* double precision arguments %[eEfgG] */
480 int expt; /* integer value of exponent */
481 int expsize; /* character count for expstr */
482 int ndig; /* actual number of digits returned by cvt */
483 char expstr[7]; /* buffer for exponent string */
484 #endif
485 u_long ulval; /* integer arguments %[diouxX] */
486 #ifdef _HAVE_SANE_QUAD_
487 u_quad_t uqval; /* %q integers */
488 #endif /* _HAVE_SANE_QUAD_ */
489 int base; /* base for [diouxX] conversion */
490 int dprec; /* a copy of prec if [diouxX], 0 otherwise */
491 int fieldsz; /* field size expanded by sign, etc */
492 int realsz; /* field size expanded by dprec */
493 int size; /* size of converted field or string */
494 char *xdigs; /* digits for [xX] conversion */
495 #define NIOV 8
496 struct __suio uio; /* output information: summary */
497 struct __siov iov[NIOV];/* ... and individual io vectors */
498 char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
499 char ox[2]; /* space for 0x hex-prefix */
500
501 /*
502 * Choose PADSIZE to trade efficiency vs. size. If larger printf
503 * fields occur frequently, increase PADSIZE and make the initialisers
504 * below longer.
505 */
506 #define PADSIZE 16 /* pad chunk size */
507 static char blanks[PADSIZE] =
508 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
509 static char zeroes[PADSIZE] =
510 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
511
512 /*
513 * BEWARE, these `goto error' on error, and PAD uses `n'.
514 */
515 #define PRINT(ptr, len) { \
516 iovp->iov_base = (ptr); \
517 iovp->iov_len = (len); \
518 uio.uio_resid += (len); \
519 iovp++; \
520 if (++uio.uio_iovcnt >= NIOV) { \
521 if (BSD__sprint(fp, &uio)) \
522 goto error; \
523 iovp = iov; \
524 } \
525 }
526 #define PAD(howmany, with) { \
527 if ((n = (howmany)) > 0) { \
528 while (n > PADSIZE) { \
529 PRINT(with, PADSIZE); \
530 n -= PADSIZE; \
531 } \
532 PRINT(with, n); \
533 } \
534 }
535 #define FLUSH() { \
536 if (uio.uio_resid && BSD__sprint(fp, &uio)) \
537 goto error; \
538 uio.uio_iovcnt = 0; \
539 iovp = iov; \
540 }
541
542 /*
543 * To extend shorts properly, we need both signed and unsigned
544 * argument extraction methods.
545 */
546 #define SARG() \
547 (flags&LONGINT ? va_arg(ap, long) : \
548 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
549 (long)va_arg(ap, int))
550 #define UARG() \
551 (flags&LONGINT ? va_arg(ap, u_long) : \
552 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \
553 (u_long)va_arg(ap, u_int))
554
555 /* optimise fprintf(stderr) (and other unbuffered Unix files) */
556 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
557 fp->_file >= 0)
558 return (BSD__sbprintf(fp, fmt0, ap));
559
560 fmt = (char *)fmt0;
561 uio.uio_iov = iovp = iov;
562 uio.uio_resid = 0;
563 uio.uio_iovcnt = 0;
564 ret = 0;
565
566 /*
567 * Scan the format for conversions (`%' character).
568 */
569 for (;;) {
570 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
571 /* void */;
572 if ((n = fmt - cp) != 0) {
573 PRINT(cp, n);
574 ret += n;
575 }
576 if (ch == '\0')
577 goto done;
578 fmt++; /* skip over '%' */
579
580 flags = 0;
581 dprec = 0;
582 width = 0;
583 prec = -1;
584 sign = '\0';
585
586 rflag: ch = *fmt++;
587 reswitch: switch (ch) {
588 case ' ':
589 /*
590 * ``If the space and + flags both appear, the space
591 * flag will be ignored.''
592 * -- ANSI X3J11
593 */
594 if (!sign)
595 sign = ' ';
596 goto rflag;
597 case '#':
598 flags |= ALT;
599 goto rflag;
600 case '*':
601 /*
602 * ``A negative field width argument is taken as a
603 * - flag followed by a positive field width.''
604 * -- ANSI X3J11
605 * They don't exclude field widths read from args.
606 */
607 if ((width = va_arg(ap, int)) >= 0)
608 goto rflag;
609 width = -width;
610 /* FALLTHROUGH */
611 case '-':
612 flags |= LADJUST;
613 goto rflag;
614 case '+':
615 sign = '+';
616 goto rflag;
617 case '.':
618 if ((ch = *fmt++) == '*') {
619 n = va_arg(ap, int);
620 prec = n < 0 ? -1 : n;
621 goto rflag;
622 }
623 n = 0;
624 while (is_digit(ch)) {
625 n = 10 * n + to_digit(ch);
626 ch = *fmt++;
627 }
628 prec = n < 0 ? -1 : n;
629 goto reswitch;
630 case '0':
631 /*
632 * ``Note that 0 is taken as a flag, not as the
633 * beginning of a field width.''
634 * -- ANSI X3J11
635 */
636 flags |= ZEROPAD;
637 goto rflag;
638 case '1': case '2': case '3': case '4':
639 case '5': case '6': case '7': case '8': case '9':
640 n = 0;
641 do {
642 n = 10 * n + to_digit(ch);
643 ch = *fmt++;
644 } while (is_digit(ch));
645 width = n;
646 goto reswitch;
647 #ifdef FLOATING_POINT
648 case 'L':
649 flags |= LONGDBL;
650 goto rflag;
651 #endif
652 case 'h':
653 flags |= SHORTINT;
654 goto rflag;
655 case 'l':
656 flags |= LONGINT;
657 goto rflag;
658 #ifdef _HAVE_SANE_QUAD_
659 case 'q':
660 flags |= QUADINT;
661 goto rflag;
662 #endif /* _HAVE_SANE_QUAD_ */
663 case 'c':
664 *(cp = buf) = va_arg(ap, int);
665 size = 1;
666 sign = '\0';
667 break;
668 case 'D':
669 flags |= LONGINT;
670 /*FALLTHROUGH*/
671 case 'd':
672 case 'i':
673 #ifdef _HAVE_SANE_QUAD_
674 if (flags & QUADINT) {
675 uqval = va_arg(ap, quad_t);
676 if ((quad_t)uqval < 0) {
677 uqval = -uqval;
678 sign = '-';
679 }
680 } else {
681 #else /* _HAVE_SANE_QUAD_ */
682 {
683 #endif /* _HAVE_SANE_QUAD_ */
684 ulval = SARG();
685 if ((long)ulval < 0) {
686 ulval = -ulval;
687 sign = '-';
688 }
689 }
690 base = 10;
691 goto number;
692 #ifdef FLOATING_POINT
693 case 'e': /* anomalous precision */
694 case 'E':
695 prec = (prec == -1) ?
696 DEFPREC + 1 : prec + 1;
697 /* FALLTHROUGH */
698 goto fp_begin;
699 case 'f': /* always print trailing zeroes */
700 if (prec != 0)
701 flags |= ALT;
702 case 'g':
703 case 'G':
704 if (prec == -1)
705 prec = DEFPREC;
706 fp_begin: _double = va_arg(ap, double);
707 /* do this before tricky precision changes */
708 if (isinf(_double)) {
709 if (_double < 0)
710 sign = '-';
711 cp = "Inf";
712 size = 3;
713 break;
714 }
715 if (isnan(_double)) {
716 cp = "NaN";
717 size = 3;
718 break;
719 }
720 flags |= FPT;
721 cp = cvt(_double, prec, flags, &softsign,
722 &expt, ch, &ndig);
723 if (ch == 'g' || ch == 'G') {
724 if (expt <= -4 || expt > prec)
725 ch = (ch == 'g') ? 'e' : 'E';
726 else
727 ch = 'g';
728 }
729 if (ch <= 'e') { /* 'e' or 'E' fmt */
730 --expt;
731 expsize = exponent(expstr, expt, ch);
732 size = expsize + ndig;
733 if (ndig > 1 || flags & ALT)
734 ++size;
735 } else if (ch == 'f') { /* f fmt */
736 if (expt > 0) {
737 size = expt;
738 if (prec || flags & ALT)
739 size += prec + 1;
740 } else /* "0.X" */
741 size = prec + 2;
742 } else if (expt >= ndig) { /* fixed g fmt */
743 size = expt;
744 if (flags & ALT)
745 ++size;
746 } else
747 size = ndig + (expt > 0 ?
748 1 : 2 - expt);
749
750 if (softsign)
751 sign = '-';
752 break;
753 #endif /* FLOATING_POINT */
754 case 'n':
755 #ifdef _HAVE_SANE_QUAD_
756 if (flags & QUADINT)
757 *va_arg(ap, quad_t *) = ret;
758 else if (flags & LONGINT)
759 #else /* _HAVE_SANE_QUAD_ */
760 if (flags & LONGINT)
761 #endif /* _HAVE_SANE_QUAD_ */
762 *va_arg(ap, long *) = ret;
763 else if (flags & SHORTINT)
764 *va_arg(ap, short *) = ret;
765 else
766 *va_arg(ap, int *) = ret;
767 continue; /* no output */
768 case 'O':
769 flags |= LONGINT;
770 /*FALLTHROUGH*/
771 case 'o':
772 #ifdef _HAVE_SANE_QUAD_
773 if (flags & QUADINT)
774 uqval = va_arg(ap, u_quad_t);
775 else
776 #endif /* _HAVE_SANE_QUAD_ */
777 ulval = UARG();
778 base = 8;
779 goto nosign;
780 case 'p':
781 /*
782 * ``The argument shall be a pointer to void. The
783 * value of the pointer is converted to a sequence
784 * of printable characters, in an implementation-
785 * defined manner.''
786 * -- ANSI X3J11
787 */
788 ulval = (u_long)va_arg(ap, void *);
789 base = 16;
790 xdigs = "0123456789abcdef";
791 #ifdef _HAVE_SANE_QUAD_
792 flags = (flags & ~QUADINT) | HEXPREFIX;
793 #else /* _HAVE_SANE_QUAD_ */
794 flags = (flags) | HEXPREFIX;
795 #endif /* _HAVE_SANE_QUAD_ */
796 ch = 'x';
797 goto nosign;
798 case 's':
799 if ((cp = va_arg(ap, char *)) == NULL)
800 cp = "(null)";
801 if (prec >= 0) {
802 /*
803 * can't use strlen; can only look for the
804 * NUL in the first `prec' characters, and
805 * strlen() will go further.
806 */
807 char *p = (char *)memchr(cp, 0, prec);
808
809 if (p != NULL) {
810 size = p - cp;
811 if (size > prec)
812 size = prec;
813 } else
814 size = prec;
815 } else
816 size = strlen(cp);
817 sign = '\0';
818 break;
819 case 'U':
820 flags |= LONGINT;
821 /*FALLTHROUGH*/
822 case 'u':
823 #ifdef _HAVE_SANE_QUAD_
824 if (flags & QUADINT)
825 uqval = va_arg(ap, u_quad_t);
826 else
827 #endif /* _HAVE_SANE_QUAD_ */
828 ulval = UARG();
829 base = 10;
830 goto nosign;
831 case 'X':
832 xdigs = "0123456789ABCDEF";
833 goto hex;
834 case 'x':
835 xdigs = "0123456789abcdef";
836 hex:
837 #ifdef _HAVE_SANE_QUAD_
838 if (flags & QUADINT)
839 uqval = va_arg(ap, u_quad_t);
840 else
841 #endif /* _HAVE_SANE_QUAD_ */
842 ulval = UARG();
843 base = 16;
844 /* leading 0x/X only if non-zero */
845 if (flags & ALT &&
846 #ifdef _HAVE_SANE_QUAD_
847 (flags & QUADINT ? uqval != 0 : ulval != 0))
848 #else /* _HAVE_SANE_QUAD_ */
849 ulval != 0)
850 #endif /* _HAVE_SANE_QUAD_ */
851 flags |= HEXPREFIX;
852
853 /* unsigned conversions */
854 nosign: sign = '\0';
855 /*
856 * ``... diouXx conversions ... if a precision is
857 * specified, the 0 flag will be ignored.''
858 * -- ANSI X3J11
859 */
860 number: if ((dprec = prec) >= 0)
861 flags &= ~ZEROPAD;
862
863 /*
864 * ``The result of converting a zero value with an
865 * explicit precision of zero is no characters.''
866 * -- ANSI X3J11
867 */
868 cp = buf + BUF;
869 #ifdef _HAVE_SANE_QUAD_
870 if (flags & QUADINT) {
871 if (uqval != 0 || prec != 0)
872 cp = __uqtoa(uqval, cp, base,
873 flags & ALT, xdigs);
874 } else {
875 #else /* _HAVE_SANE_QUAD_ */
876 {
877 #endif /* _HAVE_SANE_QUAD_ */
878 if (ulval != 0 || prec != 0)
879 cp = BSD__ultoa(ulval, cp, base,
880 flags & ALT, xdigs);
881 }
882 size = buf + BUF - cp;
883 break;
884 default: /* "%?" prints ?, unless ? is NUL */
885 if (ch == '\0')
886 goto done;
887 /* pretend it was %c with argument ch */
888 cp = buf;
889 *cp = ch;
890 size = 1;
891 sign = '\0';
892 break;
893 }
894
895 /*
896 * All reasonable formats wind up here. At this point, `cp'
897 * points to a string which (if not flags&LADJUST) should be
898 * padded out to `width' places. If flags&ZEROPAD, it should
899 * first be prefixed by any sign or other prefix; otherwise,
900 * it should be blank padded before the prefix is emitted.
901 * After any left-hand padding and prefixing, emit zeroes
902 * required by a decimal [diouxX] precision, then print the
903 * string proper, then emit zeroes required by any leftover
904 * floating precision; finally, if LADJUST, pad with blanks.
905 *
906 * Compute actual size, so we know how much to pad.
907 * fieldsz excludes decimal prec; realsz includes it.
908 */
909 fieldsz = size;
910 if (sign)
911 fieldsz++;
912 else if (flags & HEXPREFIX)
913 fieldsz += 2;
914 realsz = dprec > fieldsz ? dprec : fieldsz;
915
916 /* right-adjusting blank padding */
917 if ((flags & (LADJUST|ZEROPAD)) == 0)
918 PAD(width - realsz, blanks);
919
920 /* prefix */
921 if (sign) {
922 PRINT(&sign, 1);
923 } else if (flags & HEXPREFIX) {
924 ox[0] = '0';
925 ox[1] = ch;
926 PRINT(ox, 2);
927 }
928
929 /* right-adjusting zero padding */
930 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
931 PAD(width - realsz, zeroes);
932
933 /* leading zeroes from decimal precision */
934 PAD(dprec - fieldsz, zeroes);
935
936 /* the string or number proper */
937 #ifdef FLOATING_POINT
938 if ((flags & FPT) == 0) {
939 PRINT(cp, size);
940 } else { /* glue together f_p fragments */
941 if (ch >= 'f') { /* 'f' or 'g' */
942 if (_double == 0) {
943 /* kludge for __dtoa irregularity */
944 if (prec == 0 ||
945 (flags & ALT) == 0) {
946 PRINT("0", 1);
947 } else {
948 PRINT("0.", 2);
949 PAD(ndig - 1, zeroes);
950 }
951 } else if (expt <= 0) {
952 PRINT("0.", 2);
953 PAD(-expt, zeroes);
954 PRINT(cp, ndig);
955 } else if (expt >= ndig) {
956 PRINT(cp, ndig);
957 PAD(expt - ndig, zeroes);
958 if (flags & ALT)
959 PRINT(".", 1);
960 } else {
961 PRINT(cp, expt);
962 cp += expt;
963 PRINT(".", 1);
964 PRINT(cp, ndig-expt);
965 }
966 } else { /* 'e' or 'E' */
967 if (ndig > 1 || flags & ALT) {
968 ox[0] = *cp++;
969 ox[1] = '.';
970 PRINT(ox, 2);
971 if (_double || flags & ALT == 0) {
972 PRINT(cp, ndig-1);
973 } else /* 0.[0..] */
974 /* __dtoa irregularity */
975 PAD(ndig - 1, zeroes);
976 } else /* XeYYY */
977 PRINT(cp, 1);
978 PRINT(expstr, expsize);
979 }
980 }
981 #else
982 PRINT(cp, size);
983 #endif
984 /* left-adjusting padding (always blank) */
985 if (flags & LADJUST)
986 PAD(width - realsz, blanks);
987
988 /* finally, adjust ret */
989 ret += width > realsz ? width : realsz;
990
991 FLUSH(); /* copy out the I/O vectors */
992 }
993 done:
994 FLUSH();
995 error:
996 return (__sferror(fp) ? EOF : ret);
997 /* NOTREACHED */
998 }
999
1000 #ifdef FLOATING_POINT
1001
1002 extern char *BSD__dtoa __P((double, int, int, int *, int *, char **));
1003
1004 static char *
cvt(value,ndigits,flags,sign,decpt,ch,length)1005 cvt(value, ndigits, flags, sign, decpt, ch, length)
1006 double value;
1007 int ndigits, flags, *decpt, ch, *length;
1008 char *sign;
1009 {
1010 int mode, dsgn;
1011 char *digits, *bp, *rve;
1012
1013 if (ch == 'f')
1014 mode = 3;
1015 else {
1016 mode = 2;
1017 }
1018 if (value < 0) {
1019 value = -value;
1020 *sign = '-';
1021 } else
1022 *sign = '\000';
1023 digits = BSD__dtoa(value, mode, ndigits, decpt, &dsgn, &rve);
1024 if (flags & ALT) { /* Print trailing zeros */
1025 bp = digits + ndigits;
1026 if (ch == 'f') {
1027 if (*digits == '0' && value)
1028 *decpt = -ndigits + 1;
1029 bp += *decpt;
1030 }
1031 if (value == 0) /* kludge for __dtoa irregularity */
1032 rve = bp;
1033 while (rve < bp)
1034 *rve++ = '0';
1035 }
1036 *length = rve - digits;
1037 return (digits);
1038 }
1039
1040 static int
exponent(p0,exp,fmtch)1041 exponent(p0, exp, fmtch)
1042 char *p0;
1043 int exp, fmtch;
1044 {
1045 register char *p, *t;
1046 char expbuf[MAXEXP];
1047
1048 p = p0;
1049 *p++ = fmtch;
1050 if (exp < 0) {
1051 exp = -exp;
1052 *p++ = '-';
1053 }
1054 else
1055 *p++ = '+';
1056 t = expbuf + MAXEXP;
1057 if (exp > 9) {
1058 do {
1059 *--t = to_char(exp % 10);
1060 } while ((exp /= 10) > 9);
1061 *--t = to_char(exp);
1062 for (; t < expbuf + MAXEXP; *p++ = *t++);
1063 }
1064 else {
1065 *p++ = '0';
1066 *p++ = to_char(exp);
1067 }
1068 return (p - p0);
1069 }
1070 #endif /* FLOATING_POINT */
1071
1072 int
vsnprintf(str,n,fmt,ap)1073 vsnprintf(str, n, fmt, ap)
1074 char *str;
1075 size_t n;
1076 const char *fmt;
1077 _BSD_VA_LIST_ ap;
1078 {
1079 int ret;
1080 FILE f;
1081
1082 if ((int)n < 1)
1083 return (EOF);
1084 f._flags = __SWR | __SSTR;
1085 f._bf._base = f._p = (unsigned char *)str;
1086 f._bf._size = f._w = n - 1;
1087 ret = BSD_vfprintf(&f, fmt, ap);
1088 *f._p = 0;
1089 return (ret);
1090 }
1091
1092 #if defined(LIBC_SCCS) && !defined(lint)
1093 static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93";
1094 #endif /* LIBC_SCCS and not lint */
1095
1096 #if defined(__STDC__)
1097 # include <stdarg.h>
1098 #else
1099 # include <varargs.h>
1100 #endif
1101
1102 int
1103 #if defined(__STDC__)
snprintf(char * str,size_t n,char const * fmt,...)1104 snprintf(char *str, size_t n, char const *fmt, ...)
1105 #else
1106 snprintf(str, n, fmt, va_alist)
1107 char *str, *fmt;
1108 size_t n;
1109 va_dcl
1110 #endif
1111 {
1112 int ret;
1113 va_list ap;
1114 FILE f;
1115
1116 if ((int)n < 1)
1117 return (EOF);
1118
1119 #if defined(__STDC__)
1120 va_start(ap, fmt);
1121 #else
1122 va_start(ap);
1123 #endif
1124 f._flags = __SWR | __SSTR;
1125 f._bf._base = f._p = (unsigned char *)str;
1126 f._bf._size = f._w = n - 1;
1127 ret = BSD_vfprintf(&f, fmt, ap);
1128 *f._p = 0;
1129 va_end(ap);
1130 return (ret);
1131 }
1132