/* * Copyright (c) 1988 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /****** MODIFIED BY RYB **********/ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)doprnt.c 5.35 (Berkeley) 6/27/88"; #endif /* LIBC_SCCS and not lint */ #include #include #include #include #include /* 11-bit exponent (VAX G floating point) is 308 decimal digits */ #define MAXEXP 308 /* 128 bit fraction takes up 39 decimal digits; max reasonable precision */ #define MAXFRACT 39 #define DEFPREC 6 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ #define PUTC(ch) do { if ((*put) (ch, putarg) < 0) return EOF; } while (0) #define ARG() \ _ulong = flags&LONGINT ? va_arg(argp, long) : \ flags&SHORTINT ? va_arg(argp, int) : va_arg(argp, int); #define todigit(c) ((c) - '0') #define tochar(n) ((n) + '0') #define isascii(x) (((x) & ~0x7f) == 0) #define LONGINT 0x01 /* long integer */ #define LONGDBL 0x02 /* long double; unimplemented */ #define SHORTINT 0x04 /* short integer */ #define ALT 0x08 /* alternate form */ #define LADJUST 0x10 /* left adjustment */ #define ZEROPAD 0x20 /* zero (as opposed to blank) pad */ #define HEXPREFIX 0x40 /* add 0x or 0X prefix */ #ifndef NOFLOATS static cvt(); static char *round(); static char *exponent(); #endif int _format(put, fmt0, argp, putarg) int (*put)(); u_char *fmt0; va_list argp; void *putarg; { register u_char *fmt; /* format string */ register int ch; /* character from fmt */ register int cnt; /* return value accumulator */ register int n; /* random handy integer */ register char *t; /* buffer pointer */ u_long _ulong; /* integer arguments %[diouxX] */ int base; /* base for [diouxX] conversion */ int dprec; /* decimal precision in [diouxX] */ int fieldsz; /* field size expanded by sign, etc */ int flags; /* flags as above */ int prec; /* precision from format (%.3d), or -1 */ int realsz; /* field size expanded by decimal precision */ int size; /* size of converted field or string */ int width; /* width from format (%8d), or 0 */ char sign; /* sign prefix (' ', '+', '-', or \0) */ char *digs; /* digits for [diouxX] conversion */ char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ #ifndef NOFLOATS char softsign; /* temporary negative sign for floats */ double _double; /* double precision arguments %[eEfgG] */ int fpprec; /* `extra' floating precision in [eEfgG] */ #endif fmt = fmt0; digs = "0123456789abcdef"; for (cnt = 0;; ++fmt) { for (; (ch = *fmt) && ch != '%'; ++cnt, ++fmt) PUTC(ch); if (!ch) return (cnt); flags = 0; dprec = 0; width = 0; #ifndef NOFLOATS fpprec = 0; #endif prec = -1; sign = '\0'; rflag: switch (*++fmt) { case ' ': /* * ``If the space and + flags both appear, the space * flag will be ignored.'' * -- ANSI X3J11 */ if (!sign) sign = ' '; goto rflag; case '#': flags |= ALT; goto rflag; case '*': /* * ``A negative field width argument is taken as a * - flag followed by a positive field width.'' * -- ANSI X3J11 * They don't exclude field widths read from args. */ if ((width = va_arg(argp, int)) >= 0) goto rflag; width = -width; /* FALLTHROUGH */ case '-': flags |= LADJUST; goto rflag; case '+': sign = '+'; goto rflag; case '.': if (*++fmt == '*') n = va_arg(argp, int); else { n = 0; while (isascii(*fmt) && isdigit(*fmt)) n = 10 * n + todigit(*fmt++); --fmt; } prec = n < 0 ? -1 : n; goto rflag; case '0': /* * ``Note that 0 is taken as a flag, not as the * beginning of a field width.'' * -- ANSI X3J11 */ flags |= ZEROPAD; goto rflag; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': n = 0; do { n = 10 * n + todigit(*fmt); } while (isascii(*++fmt) && isdigit(*fmt)); width = n; --fmt; goto rflag; case 'L': flags |= LONGDBL; goto rflag; case 'h': flags |= SHORTINT; goto rflag; case 'l': flags |= LONGINT; goto rflag; case 'c': *(t = buf) = va_arg(argp, int); size = 1; sign = '\0'; goto pforw; case 'D': flags |= LONGINT; /*FALLTHROUGH*/ case 'd': case 'i': ARG(); if ((long)_ulong < 0) { _ulong = -(int)_ulong; sign = '-'; } base = 10; goto number; #ifndef NOFLOATS case 'e': case 'E': case 'f': case 'g': case 'G': _double = va_arg(argp, double); if (isnan(_double)) { t = "NaN"; goto baddouble; }else{ if (isinf(_double)) { t = "Inf"; goto baddouble; }else{ /* * don't do unrealistic precision; just pad it with * zeroes later, so buffer size stays rational. */ if (prec > MAXFRACT) { if (*fmt != 'g' && *fmt != 'G' || (flags&ALT)) fpprec = prec - MAXFRACT; prec = MAXFRACT; } else if (prec == -1) prec = DEFPREC; /* * softsign avoids negative 0 if _double is < 0 and * no significant digits will be shown */ if (_double < 0) { softsign = '-'; _double = -_double; } else softsign = 0; /* * cvt may have to round up past the "start" of the * buffer, i.e. ``intf("%.2f", (double)9.999);''; * if the first char isn't NULL, it did. */ *buf = NULL; size = cvt(_double, prec, flags, &softsign, *fmt, buf, buf + sizeof(buf)); if (softsign) sign = '-'; t = *buf ? buf : buf + 1; goto pforw; } } baddouble: PUTC(t[0]); PUTC(t[1]); PUTC(t[2]); width -= 3; while(width-- > 0){ PUTC(' '); } break; #endif /* NOFLOATS */ case 'n': if (flags & LONGINT) *va_arg(argp, long *) = cnt; else if (flags & SHORTINT) *va_arg(argp, short *) = cnt; else *va_arg(argp, int *) = cnt; break; case 'O': flags |= LONGINT; /*FALLTHROUGH*/ case 'o': ARG(); base = 8; goto nosign; case 'p': /* * ``The argument shall be a pointer to void. The * value of the pointer is converted to a sequence * of printable characters, in an implementation- * defined manner.'' * -- ANSI X3J11 */ /* NOSTRICT */ _ulong = (u_long)va_arg(argp, void *); base = 16; goto nosign; case 's': if (!(t = va_arg(argp, char *))) t = "(null)"; if (prec >= 0) { /* * can't use strlen; can only look for the * NUL in the first `prec' characters, and * strlen() will go further. */ char *p; if (p = memchr(t, 0, prec)) { size = p - t; if (size > prec) size = prec; } else size = prec; } else size = strlen(t); sign = '\0'; goto pforw; case 'U': flags |= LONGINT; /*FALLTHROUGH*/ case 'u': ARG(); base = 10; goto nosign; case 'X': digs = "0123456789ABCDEF"; /* FALLTHROUGH */ case 'x': ARG(); base = 16; /* leading 0x/X only if non-zero */ if (flags & ALT && _ulong != 0) flags |= HEXPREFIX; /* unsigned conversions */ nosign: sign = '\0'; /* * ``... diouXx conversions ... if a precision is * specified, the 0 flag will be ignored.'' * -- ANSI X3J11 */ number: if ((dprec = prec) >= 0) flags &= ~ZEROPAD; /* * ``The result of converting a zero value with an * explicit precision of zero is no characters.'' * -- ANSI X3J11 */ t = buf + BUF; if (_ulong != 0 || prec != 0) { do { *--t = digs[_ulong % base]; _ulong /= base; } while (_ulong); digs = "0123456789abcdef"; if (flags & ALT && base == 8 && *t != '0') *--t = '0'; /* octal leading 0 */ } size = buf + BUF - t; pforw: /* * All reasonable formats wind up here. At this point, * `t' points to a string which (if not flags&LADJUST) * should be padded out to `width' places. If * flags&ZEROPAD, it should first be prefixed by any * sign or other prefix; otherwise, it should be blank * padded before the prefix is emitted. After any * left-hand padding and prefixing, emit zeroes * required by a decimal [diouxX] precision, then print * the string proper, then emit zeroes required by any * leftover floating precision; finally, if LADJUST, * pad with blanks. */ /* * compute actual size, so we know how much to pad * fieldsz excludes decimal prec; realsz includes it */ fieldsz = size; #ifndef NOFLOATS fieldsz += fpprec; #endif if (sign) fieldsz++; if (flags & HEXPREFIX) fieldsz += 2; realsz = dprec > fieldsz ? dprec : fieldsz; /* right-adjusting blank padding */ if ((flags & (LADJUST|ZEROPAD)) == 0 && width) for (n = realsz; n < width; n++) PUTC(' '); /* prefix */ if (sign) PUTC(sign); if (flags & HEXPREFIX) { PUTC('0'); PUTC((char)*fmt); } /* right-adjusting zero padding */ if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) for (n = realsz; n < width; n++) PUTC('0'); /* leading zeroes from decimal precision */ for (n = fieldsz; n < dprec; n++) PUTC('0'); /* the string or number proper */ n = size; while (--n >= 0) PUTC(*t++); #ifndef NOFLOATS /* trailing f.p. zeroes */ while (--fpprec >= 0) PUTC('0'); #endif /* left-adjusting padding (always blank) */ if (flags & LADJUST) for (n = realsz; n < width; n++) PUTC(' '); /* finally, adjust cnt */ cnt += width > realsz ? width : realsz; break; case '\0': /* "%?" prints ?, unless ? is NULL */ return (cnt); default: PUTC((char)*fmt); cnt++; } } /* NOTREACHED */ } #ifndef NOFLOATS static char *exponent(), *round(); static cvt(number, prec, flags, signp, fmtch, startp, endp) double number; register int prec; int flags; u_char fmtch; char *signp, *startp, *endp; { register char *p, *t; register double fract; int dotrim, expcnt, gformat; double integer, tmp, modf(); dotrim = expcnt = gformat = 0; fract = modf(number, &integer); /* get an extra slot for rounding. */ t = ++startp; /* * get integer portion of number; put into the end of the buffer; the * .01 is added for modf(356.0 / 10, &integer) returning .59999999... */ for (p = endp - 1; integer; ++expcnt) { tmp = modf(integer / 10, &integer); *p-- = tochar((int)((tmp + .01) * 10)); } switch(fmtch) { case 'f': /* reverse integer into beginning of buffer */ if (expcnt) for (; ++p < endp; *t++ = *p); else *t++ = '0'; /* * if precision required or alternate flag set, add in a * decimal point. */ if (prec || flags&ALT) *t++ = '.'; /* if requires more precision and some fraction left */ if (fract) { if (prec) do { fract = modf(fract * 10, &tmp); *t++ = tochar((int)tmp); } while (--prec && fract); if (fract) startp = round(fract, (int *)NULL, startp, t - 1, (char)0, signp); } for (; prec--; *t++ = '0'); break; case 'e': case 'E': eformat: if (expcnt) { *t++ = *++p; if (prec || flags&ALT) *t++ = '.'; /* if requires more precision and some integer left */ for (; prec && ++p < endp; --prec) *t++ = *p; /* * if done precision and more of the integer component, * round using it; adjust fract so we don't re-round * later. */ if (!prec && ++p < endp) { fract = 0; startp = round((double)0, &expcnt, startp, t - 1, *p, signp); } /* adjust expcnt for digit in front of decimal */ --expcnt; } /* until first fractional digit, decrement exponent */ else if (fract) { /* adjust expcnt for digit in front of decimal */ for (expcnt = -1;; --expcnt) { fract = modf(fract * 10, &tmp); if (tmp) break; } *t++ = tochar((int)tmp); if (prec || flags&ALT) *t++ = '.'; } else { *t++ = '0'; if (prec || flags&ALT) *t++ = '.'; } /* if requires more precision and some fraction left */ if (fract) { if (prec) do { fract = modf(fract * 10, &tmp); *t++ = tochar((int)tmp); } while (--prec && fract); if (fract) startp = round(fract, &expcnt, startp, t - 1, (char)0, signp); } /* if requires more precision */ for (; prec--; *t++ = '0'); /* unless alternate flag, trim any g/G format trailing 0's */ if (gformat && !(flags&ALT)) { while (t > startp && *--t == '0'); if (*t == '.') --t; ++t; } t = exponent(t, expcnt, fmtch); break; case 'g': case 'G': /* a precision of 0 is treated as a precision of 1. */ if (!prec) ++prec; /* * ``The style used depends on the value converted; style e * will be used only if the exponent resulting from the * conversion is less than -4 or greater than the precision.'' * -- ANSI X3J11 */ if (expcnt > prec || !expcnt && fract && fract < .0001) { /* * g/G format counts "significant digits, not digits of * precision; for the e/E format, this just causes an * off-by-one problem, i.e. g/G considers the digit * before the decimal point significant and e/E doesn't * count it as precision. */ --prec; fmtch -= 2; /* G->E, g->e */ gformat = 1; goto eformat; } /* * reverse integer into beginning of buffer, * note, decrement precision */ if (expcnt) for (; ++p < endp; *t++ = *p, --prec); else *t++ = '0'; /* * if precision required or alternate flag set, add in a * decimal point. If no digits yet, add in leading 0. */ if (prec || flags&ALT) { dotrim = 1; *t++ = '.'; } else dotrim = 0; /* if requires more precision and some fraction left */ if (fract) { if (prec) { do { fract = modf(fract * 10, &tmp); *t++ = tochar((int)tmp); } while(!tmp); while (--prec && fract) { fract = modf(fract * 10, &tmp); *t++ = tochar((int)tmp); } } if (fract) startp = round(fract, (int *)NULL, startp, t - 1, (char)0, signp); } /* alternate format, adds 0's for precision, else trim 0's */ if (flags&ALT) for (; prec--; *t++ = '0'); else if (dotrim) { while (t > startp && *--t == '0'); if (*t != '.') ++t; } } return(t - startp); } static char * round(fract, exp, start, end, ch, signp) double fract; int *exp; register char *start, *end; char ch, *signp; { double tmp; if (fract) (void)modf(fract * 10, &tmp); else tmp = todigit(ch); if (tmp > 4) for (;; --end) { if (*end == '.') --end; if (++*end <= '9') break; *end = '0'; if (end == start) { if (exp) { /* e/E; increment exponent */ *end = '1'; ++*exp; } else { /* f; add extra digit */ *--end = '1'; --start; } break; } } /* ``"%.3f", (double)-0.0004'' gives you a negative 0. */ else if (*signp == '-') for (;; --end) { if (*end == '.') --end; if (*end != '0') break; if (end == start) *signp = 0; } return(start); } static char * exponent(p, exp, fmtch) register char *p; register int exp; u_char fmtch; { register char *t; char expbuf[MAXEXP]; *p++ = fmtch; if (exp < 0) { exp = -exp; *p++ = '-'; } else *p++ = '+'; t = expbuf + MAXEXP; if (exp > 9) { do { *--t = tochar(exp % 10); } while ((exp /= 10) > 9); *--t = tochar(exp); for (; t < expbuf + MAXEXP; *p++ = *t++); } else { *p++ = '0'; *p++ = tochar(exp); } return(p); } #endif /* NOFLOATS */