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1.1 root 1: /*
2: * Copyright (c) 1988 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted
6: * provided that the above copyright notice and this paragraph are
7: * duplicated in all such forms and that any documentation,
8: * advertising materials, and other materials related to such
9: * distribution and use acknowledge that the software was developed
10: * by the University of California, Berkeley. The name of the
11: * University may not be used to endorse or promote products derived
12: * from this software without specific prior written permission.
13: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15: * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16: */
17:
18: /*
19: $Header: /usr2/odi/lib.src/RCS/doprint.C,v 1.3 89/09/19 12:00:34 benson Exp $
20:
21: Copyright (c) 1989 by Object Design, Inc., Burlington, Mass.
22: All rights reserved.
23:
24: */
25:
26: #if defined(LIBC_SCCS) && !defined(lint)
27: static char sccsid[] = "@(#)doprnt.c 5.35 (Berkeley) 6/27/88";
28: #endif /* LIBC_SCCS and not lint */
29:
30: #include <sys/types.h>
31: #include <stdarg.h>
32: #include <ctype.h>
33: #include <iostream.h>
34: #include <strstream.h>
35: #include <memory.h>
36: #include <math.h>
37: #include <string.h>
38: #include <print_self.H>
39:
40: /* 11-bit exponent (VAX G floating point) is 308 decimal digits */
41: #define MAXEXP 308
42: /* 128 bit fraction takes up 39 decimal digits; max reasonable precision */
43: #define MAXFRACT 39
44:
45: #define DEFPREC 6
46:
47: #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */
48:
49: #define PUTC(ch) (void) fp.put(ch)
50:
51: #define ARG() \
52: _ulong = flags&LONGINT ? va_arg(argp, long) : \
53: flags&SHORTINT ? va_arg(argp, short) : va_arg(argp, int);
54:
55: #define todigit(c) ((c) - '0')
56: #define tochar(n) ((n) + '0')
57:
58: #define LONGINT 0x01 /* long integer */
59: #define LONGDBL 0x02 /* long double; unimplemented */
60: #define SHORTINT 0x04 /* short integer */
61: #define ALT 0x08 /* alternate form */
62: #define LADJUST 0x10 /* left adjustment */
63: #define ZEROPAD 0x20 /* zero (as opposed to blank) pad */
64: #define HEXPREFIX 0x40 /* add 0x or 0X prefix */
65:
66:
67: static char * exponent(char * p, int exp, u_char fmtch);
68: static char * round(double fract,
69: int * exp,
70: char * start,
71: char * end,
72: char ch,
73: char * signp);
74:
75:
76:
77: static
78: cvt(double number,
79: register int prec,
80: int flags,
81: char * signp,
82: u_char fmtch,
83: char * startp,
84: char * endp)
85: {
86: register char *p, *t;
87: register double fract;
88: int dotrim, expcnt, gformat;
89: double integer, tmp;
90:
91: dotrim = expcnt = gformat = 0;
92: fract = modf(number, &integer);
93:
94: /* get an extra slot for rounding. */
95: t = ++startp;
96:
97: /*
98: * get integer portion of number; put into the end of the buffer; the
99: * .01 is added for modf(356.0 / 10, &integer) returning .59999999...
100: */
101: for (p = endp - 1; integer; ++expcnt) {
102: tmp = modf(integer / 10, &integer);
103: *p-- = tochar((int)((tmp + .01) * 10));
104: }
105: switch(fmtch) {
106: case 'f':
107: /* reverse integer into beginning of buffer */
108: if (expcnt)
109: for (; ++p < endp; *t++ = *p);
110: else
111: *t++ = '0';
112: /*
113: * if precision required or alternate flag set, add in a
114: * decimal point.
115: */
116: if (prec || flags&ALT)
117: *t++ = '.';
118: /* if requires more precision and some fraction left */
119: if (fract) {
120: if (prec)
121: do {
122: fract = modf(fract * 10, &tmp);
123: *t++ = tochar((int)tmp);
124: } while (--prec && fract);
125: if (fract)
126: startp = round(fract, (int *)NULL, startp,
127: t - 1, (char)0, signp);
128: }
129: for (; prec--; *t++ = '0');
130: break;
131: case 'e':
132: case 'E':
133: eformat: if (expcnt) {
134: *t++ = *++p;
135: if (prec || flags&ALT)
136: *t++ = '.';
137: /* if requires more precision and some integer left */
138: for (; prec && ++p < endp; --prec)
139: *t++ = *p;
140: /*
141: * if done precision and more of the integer component,
142: * round using it; adjust fract so we don't re-round
143: * later.
144: */
145: if (!prec && ++p < endp) {
146: fract = 0;
147: startp = round((double)0, &expcnt, startp,
148: t - 1, *p, signp);
149: }
150: /* adjust expcnt for digit in front of decimal */
151: --expcnt;
152: }
153: /* until first fractional digit, decrement exponent */
154: else if (fract) {
155: /* adjust expcnt for digit in front of decimal */
156: for (expcnt = -1;; --expcnt) {
157: fract = modf(fract * 10, &tmp);
158: if (tmp)
159: break;
160: }
161: *t++ = tochar((int)tmp);
162: if (prec || flags&ALT)
163: *t++ = '.';
164: }
165: else {
166: *t++ = '0';
167: if (prec || flags&ALT)
168: *t++ = '.';
169: }
170: /* if requires more precision and some fraction left */
171: if (fract) {
172: if (prec)
173: do {
174: fract = modf(fract * 10, &tmp);
175: *t++ = tochar((int)tmp);
176: } while (--prec && fract);
177: if (fract)
178: startp = round(fract, &expcnt, startp,
179: t - 1, (char)0, signp);
180: }
181: /* if requires more precision */
182: for (; prec--; *t++ = '0');
183:
184: /* unless alternate flag, trim any g/G format trailing 0's */
185: if (gformat && !(flags&ALT)) {
186: while (t > startp && *--t == '0');
187: if (*t == '.')
188: --t;
189: ++t;
190: }
191: t = exponent(t, expcnt, fmtch);
192: break;
193: case 'g':
194: case 'G':
195: /* a precision of 0 is treated as a precision of 1. */
196: if (!prec)
197: ++prec;
198: /*
199: * ``The style used depends on the value converted; style e
200: * will be used only if the exponent resulting from the
201: * conversion is less than -4 or greater than the precision.''
202: * -- ANSI X3J11
203: */
204: if (expcnt > prec || !expcnt && fract && fract < .0001) {
205: /*
206: * g/G format counts "significant digits, not digits of
207: * precision; for the e/E format, this just causes an
208: * off-by-one problem, i.e. g/G considers the digit
209: * before the decimal point significant and e/E doesn't
210: * count it as precision."
211: */
212: --prec;
213: fmtch -= 2; /* G->E, g->e */
214: gformat = 1;
215: goto eformat;
216: }
217: /*
218: * reverse integer into beginning of buffer,
219: * note, decrement precision
220: */
221: if (expcnt)
222: for (; ++p < endp; *t++ = *p, --prec);
223: else
224: *t++ = '0';
225: /*
226: * if precision required or alternate flag set, add in a
227: * decimal point. If no digits yet, add in leading 0.
228: */
229: if (prec || flags&ALT) {
230: dotrim = 1;
231: *t++ = '.';
232: }
233: else
234: dotrim = 0;
235: /* if requires more precision and some fraction left */
236: if (fract) {
237: if (prec) {
238: do {
239: fract = modf(fract * 10, &tmp);
240: *t++ = tochar((int)tmp);
241: } while(!tmp);
242: while (--prec && fract) {
243: fract = modf(fract * 10, &tmp);
244: *t++ = tochar((int)tmp);
245: }
246: }
247: if (fract)
248: startp = round(fract, (int *)NULL, startp,
249: t - 1, (char)0, signp);
250: }
251: /* alternate format, adds 0's for precision, else trim 0's */
252: if (flags&ALT)
253: for (; prec--; *t++ = '0');
254: else if (dotrim) {
255: while (t > startp && *--t == '0');
256: if (*t != '.')
257: ++t;
258: }
259: }
260: return(t - startp);
261: }
262:
263: static char * round(double fract,
264: int * exp,
265: char * start,
266: char * end,
267: char ch,
268: char * signp)
269: {
270: double tmp;
271:
272: if (fract)
273: (void)modf(fract * 10, &tmp);
274: else
275: tmp = todigit(ch);
276: if (tmp > 4)
277: for (;; --end) {
278: if (*end == '.')
279: --end;
280: if (++*end <= '9')
281: break;
282: *end = '0';
283: if (end == start) {
284: if (exp) { /* e/E; increment exponent */
285: *end = '1';
286: ++*exp;
287: }
288: else { /* f; add extra digit */
289: *--end = '1';
290: --start;
291: }
292: break;
293: }
294: }
295: /* ``"%.3f", (double)-0.0004'' gives you a negative 0. */
296: else if (*signp == '-')
297: for (;; --end) {
298: if (*end == '.')
299: --end;
300: if (*end != '0')
301: break;
302: if (end == start)
303: *signp = 0;
304: }
305: return(start);
306: }
307:
308: static char * exponent(char * p, int exp, u_char fmtch)
309: {
310: register char *t;
311: char expbuf[MAXEXP];
312:
313: *p++ = fmtch;
314: if (exp < 0) {
315: exp = -exp;
316: *p++ = '-';
317: }
318: else
319: *p++ = '+';
320: t = expbuf + MAXEXP;
321: if (exp > 9) {
322: do {
323: *--t = tochar(exp % 10);
324: } while ((exp /= 10) > 9);
325: *--t = tochar(exp);
326: for (; t < expbuf + MAXEXP; *p++ = *t++);
327: }
328: else {
329: *p++ = '0';
330: *p++ = tochar(exp);
331: }
332: return(p);
333: }
334:
335: int vostream_printf(const char *fmt0, va_list argp, ostream& fp)
336: {
337: register const u_char *fmt; /* format string */
338: register int ch; /* character from fmt */
339: register int cnt; /* return value accumulator */
340: register int n; /* random handy integer */
341: register char *t; /* buffer pointer */
342: double _double; /* double precision arguments %[eEfgG] */
343: u_long _ulong; /* integer arguments %[diouxX] */
344: int base; /* base for [diouxX] conversion */
345: int dprec; /* decimal precision in [diouxX] */
346: int fieldsz; /* field size expanded by sign, etc */
347: int flags; /* flags as above */
348: int fpprec; /* `extra' floating precision in [eEfgG] */
349: int prec; /* precision from format (%.3d), or -1 */
350: int realsz; /* field size expanded by decimal precision */
351: int size; /* size of converted field or string */
352: int width; /* width from format (%8d), or 0 */
353: char sign; /* sign prefix (' ', '+', '-', or \0) */
354: char softsign; /* temporary negative sign for floats */
355: char *digs; /* digits for [diouxX] conversion */
356: char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
357:
358: fmt = (const u_char *)fmt0;
359: digs = "0123456789abcdef";
360: for (cnt = 0;; ++fmt) {
361: for (;(ch = *fmt) && ch != '%'; ++cnt, ++fmt)
362: PUTC(ch);
363: if (!ch)return (cnt);
364:
365: flags = 0; dprec = 0; fpprec = 0; width = 0;
366: prec = -1;
367: sign = '\0';
368:
369: rflag: switch (*++fmt) {
370: case ' ':
371: /*
372: * ``If the space and + flags both appear, the space
373: * flag will be ignored.''
374: * -- ANSI X3J11
375: */
376: if (!sign)
377: sign = ' ';
378: goto rflag;
379: case '#':
380: flags |= ALT;
381: goto rflag;
382: case '*':
383: /*
384: * ``A negative field width argument is taken as a
385: * - flag followed by a positive field width.''
386: * -- ANSI X3J11
387: * They don't exclude field widths read from args.
388: */
389: if ((width = va_arg(argp, int)) >= 0)
390: goto rflag;
391: width = -width;
392: /* FALLTHROUGH */
393: case '-':
394: flags |= LADJUST;
395: goto rflag;
396: case '+':
397: sign = '+';
398: goto rflag;
399: case '.':
400: if (*++fmt == '*')
401: n = va_arg(argp, int);
402: else {
403: n = 0;
404: while (isascii(*fmt) && isdigit(*fmt))
405: n = 10 * n + todigit(*fmt++);
406: --fmt;
407: }
408: prec = n < 0 ? -1 : n;
409: goto rflag;
410: case '0':
411: /*
412: * ``Note that 0 is taken as a flag, not as the
413: * beginning of a field width.''
414: * -- ANSI X3J11
415: */
416: flags |= ZEROPAD;
417: goto rflag;
418: case '1': case '2': case '3': case '4':
419: case '5': case '6': case '7': case '8': case '9':
420: n = 0;
421: do {
422: n = 10 * n + todigit(*fmt);
423: } while (isascii(*++fmt) && isdigit(*fmt));
424: width = n;
425: --fmt;
426: goto rflag;
427: case 'L':
428: flags |= LONGDBL;
429: goto rflag;
430: case 'h':
431: flags |= SHORTINT;
432: goto rflag;
433: case 'l':
434: flags |= LONGINT;
435: goto rflag;
436: case 'c':
437: *(t = buf) = va_arg(argp, int);
438: size = 1;
439: sign = '\0';
440: goto pforw;
441: case 'D':
442: flags |= LONGINT;
443: /*FALLTHROUGH*/
444: case 'd':
445: case 'i':
446: ARG();
447: if ((long)_ulong < 0) {
448: _ulong = -_ulong;
449: sign = '-';
450: }
451: base = 10;
452: goto number;
453: case 'e':
454: case 'E':
455: case 'f':
456: case 'g':
457: case 'G':
458: _double = va_arg(argp, double);
459: /*
460: * don't do unrealistic precision; just pad it with
461: * zeroes later, so buffer size stays rational.
462: */
463: if (prec > MAXFRACT) {
464: if (*fmt != 'g' && *fmt != 'G' || (flags&ALT))
465: fpprec = prec - MAXFRACT;
466: prec = MAXFRACT;
467: }
468: else if (prec == -1)
469: prec = DEFPREC;
470: /*
471: * softsign avoids negative 0 if _double is < 0 and
472: * no significant digits will be shown
473: */
474: if (_double < 0) {
475: softsign = '-';
476: _double = -_double;
477: }
478: else
479: softsign = 0;
480: /*
481: * cvt may have to round up past the "start" of the
482: * buffer, i.e. ``intf("%.2f", (double)9.999);'';
483: * if the first char isn't NULL, it did.
484: */
485: *buf = NULL;
486: size = cvt(_double, prec, flags, &softsign, *fmt, buf,
487: buf + sizeof(buf));
488: if (softsign)
489: sign = '-';
490: t = *buf ? buf : buf + 1;
491: goto pforw;
492: case 'n':
493: if (flags & LONGINT)
494: *va_arg(argp, long *) = cnt;
495: else if (flags & SHORTINT)
496: *va_arg(argp, short *) = cnt;
497: else
498: *va_arg(argp, int *) = cnt;
499: break;
500: case 'O':
501: flags |= LONGINT;
502: /*FALLTHROUGH*/
503: case 'o':
504: ARG();
505: base = 8;
506: goto nosign;
507: case 'T': // Type
508: {
509: streampos cur_pos;
510: streampos new_pos;
511:
512: cur_pos = fp.tellp();
513:
514: _Print_self * obj = va_arg (argp, _Print_self *);
515: obj->print_self (fp);
516:
517: new_pos = fp.tellp();
518:
519: cnt += new_pos - cur_pos;
520: }
521: break;
522:
523: case 'p':
524: /*
525: * ``The argument shall be a pointer to void. The
526: * value of the pointer is converted to a sequence
527: * of printable characters, in an implementation-
528: * defined manner.''
529: * -- ANSI X3J11
530: */
531: /* NOSTRICT */
532: _ulong = (u_long)va_arg(argp, void *);
533: base = 16;
534: goto nosign;
535: case 's':
536: if (!(t = va_arg(argp, char *)))
537: t = "(null)";
538: if (prec >= 0) {
539: /*
540: * can't use strlen; can only look for the
541: * NUL in the first `prec' characters, and
542: * strlen() will go further.
543: */
544: char *p;
545:
546: if (p = (char *) memchr(t, 0, prec)) {
547: size = p - t;
548: if (size > prec)
549: size = prec;
550: } else
551: size = prec;
552: } else
553: size = strlen(t);
554: sign = '\0';
555: goto pforw;
556: case 'U':
557: flags |= LONGINT;
558: /*FALLTHROUGH*/
559: case 'u':
560: ARG();
561: base = 10;
562: goto nosign;
563: case 'X':
564: digs = "0123456789ABCDEF";
565: /* FALLTHROUGH */
566: case 'x':
567: ARG();
568: base = 16;
569: /* leading 0x/X only if non-zero */
570: if (flags & ALT && _ulong != 0)
571: flags |= HEXPREFIX;
572:
573: /* unsigned conversions */
574: nosign: sign = '\0';
575: /*
576: * ``... diouXx conversions ... if a precision is
577: * specified, the 0 flag will be ignored.''
578: * -- ANSI X3J11
579: */
580: number: if ((dprec = prec) >= 0)
581: flags &= ~ZEROPAD;
582:
583: /*
584: * ``The result of converting a zero value with an
585: * explicit precision of zero is no characters.''
586: * -- ANSI X3J11
587: */
588: t = buf + BUF;
589: if (_ulong != 0 || prec != 0) {
590: do {
591: *--t = digs[_ulong % base];
592: _ulong /= base;
593: } while (_ulong);
594: digs = "0123456789abcdef";
595: if (flags & ALT && base == 8 && *t != '0')
596: *--t = '0'; /* octal leading 0 */
597: }
598: size = buf + BUF - t;
599:
600: pforw:
601: /*
602: * All reasonable formats wind up here. At this point,
603: * `t' points to a string which (if not flags&LADJUST)
604: * should be padded out to `width' places. If
605: * flags&ZEROPAD, it should first be prefixed by any
606: * sign or other prefix; otherwise, it should be blank
607: * padded before the prefix is emitted. After any
608: * left-hand padding and prefixing, emit zeroes
609: * required by a decimal [diouxX] precision, then print
610: * the string proper, then emit zeroes required by any
611: * leftover floating precision; finally, if LADJUST,
612: * pad with blanks.
613: */
614:
615: /*
616: * compute actual size, so we know how much to pad
617: * fieldsz excludes decimal prec; realsz includes it
618: */
619: fieldsz = size + fpprec;
620: if (sign)
621: fieldsz++;
622: if (flags & HEXPREFIX)
623: fieldsz += 2;
624: realsz = dprec > fieldsz ? dprec : fieldsz;
625:
626: /* right-adjusting blank padding */
627: if ((flags & (LADJUST|ZEROPAD)) == 0 && width)
628: for (n = realsz; n < width; n++)
629: PUTC(' ');
630: /* prefix */
631: if (sign)
632: PUTC(sign);
633: if (flags & HEXPREFIX) {
634: PUTC('0');
635: PUTC((char)*fmt);
636: }
637: /* right-adjusting zero padding */
638: if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
639: for (n = realsz; n < width; n++)
640: PUTC('0');
641: /* leading zeroes from decimal precision */
642: for (n = fieldsz; n < dprec; n++)
643: PUTC('0');
644:
645: /* the string or number proper */
646:
647: fp.write(t, size);
648:
649: /* trailing f.p. zeroes */
650: while (--fpprec >= 0)
651: PUTC('0');
652: /* left-adjusting padding (always blank) */
653: if (flags & LADJUST)
654: for (n = realsz; n < width; n++)
655: PUTC(' ');
656: /* finally, adjust cnt */
657: cnt += width > realsz ? width : realsz;
658: break;
659: case '\0': /* "%?" prints ?, unless ? is NULL */
660: return (cnt);
661: default:
662: PUTC(*fmt);
663: cnt++;
664: }
665: }
666: /* NOTREACHED */
667: }
668:
669: int ostream_printf(ostream& stream, const char * format ...)
670: {
671: int ret;
672:
673: va_list args;
674: va_start(args, format);
675: ret = vostream_printf(format, args, stream);
676: va_end(args);
677: return ret;
678: }
679:
680: // There are intended to be more convienient that stirring up
681: // an strstream by hand.
682:
683: int printf_to_string (char * string, int length, const char * format ...)
684: {
685: ostrstream& stream = ostrstream (string, length, (open_mode)ios::app);
686:
687: va_list args;
688: va_start(args, format);
689:
690: vostream_printf (format, args, stream);
691:
692: va_end(args);
693: stream.str();
694: return stream.pcount();
695: }
696:
697: // caller of this must free() the string that comes back.
698:
699: char * printf_to_alloc_string (const char * format ...)
700: {
701: ostrstream& stream = ostrstream ();
702:
703: va_list args;
704: va_start(args, format);
705:
706: vostream_printf (format, args, stream);
707:
708: va_end(args);
709: return stream.str();
710: }
711:
712:
713:
714:
715: static char rcssrc[] = "$Source: /usr2/odi/lib.src/RCS/doprint.C,v $";
716: static char rcsrev[] = "$Revision: 1.3 $";
717: static char rcsdate[] = "$Date: 89/09/19 12:00:34 $";
718: static char copyright[]="Copyright (c) 1989 by Object Design, Inc., Burlington, Mass.";
719:
720:
721: /*
722: $Log: doprint.C,v $
723: Revision 1.3 89/09/19 12:00:34 benson
724: Fix a bug in printing numbers that sometimes added garbage.
725:
726: Revision 1.2 89/05/19 10:46:07 benson
727: fix include path for print_self.
728:
729: Revision 1.1 89/05/19 10:40:19 benson
730: Initial revision
731:
732:
733: end_log
734: */
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.