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Diffstat (limited to 'src/libfmt/fltfmt.c')
-rw-r--r-- | src/libfmt/fltfmt.c | 610 |
1 files changed, 0 insertions, 610 deletions
diff --git a/src/libfmt/fltfmt.c b/src/libfmt/fltfmt.c deleted file mode 100644 index 234f03d9..00000000 --- a/src/libfmt/fltfmt.c +++ /dev/null @@ -1,610 +0,0 @@ -/* - * The authors of this software are Rob Pike and Ken Thompson. - * Copyright (c) 2002 by Lucent Technologies. - * Permission to use, copy, modify, and distribute this software for any - * purpose without fee is hereby granted, provided that this entire notice - * is included in all copies of any software which is or includes a copy - * or modification of this software and in all copies of the supporting - * documentation for such software. - * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED - * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY - * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY - * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. - */ -#include <stdio.h> -#include <math.h> -#include <float.h> -#include <string.h> -#include <stdlib.h> -#include <errno.h> -#include <stdarg.h> -#include "fmt.h" -#include "fmtdef.h" -#include "nan.h" - -enum -{ - FDEFLT = 6, - NSIGNIF = 17 -}; - -/* - * first few powers of 10, enough for about 1/2 of the - * total space for doubles. - */ -static double pows10[] = -{ - 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, - 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, - 1e20, 1e21, 1e22, 1e23, 1e24, 1e25, 1e26, 1e27, 1e28, 1e29, - 1e30, 1e31, 1e32, 1e33, 1e34, 1e35, 1e36, 1e37, 1e38, 1e39, - 1e40, 1e41, 1e42, 1e43, 1e44, 1e45, 1e46, 1e47, 1e48, 1e49, - 1e50, 1e51, 1e52, 1e53, 1e54, 1e55, 1e56, 1e57, 1e58, 1e59, - 1e60, 1e61, 1e62, 1e63, 1e64, 1e65, 1e66, 1e67, 1e68, 1e69, - 1e70, 1e71, 1e72, 1e73, 1e74, 1e75, 1e76, 1e77, 1e78, 1e79, - 1e80, 1e81, 1e82, 1e83, 1e84, 1e85, 1e86, 1e87, 1e88, 1e89, - 1e90, 1e91, 1e92, 1e93, 1e94, 1e95, 1e96, 1e97, 1e98, 1e99, - 1e100, 1e101, 1e102, 1e103, 1e104, 1e105, 1e106, 1e107, 1e108, 1e109, - 1e110, 1e111, 1e112, 1e113, 1e114, 1e115, 1e116, 1e117, 1e118, 1e119, - 1e120, 1e121, 1e122, 1e123, 1e124, 1e125, 1e126, 1e127, 1e128, 1e129, - 1e130, 1e131, 1e132, 1e133, 1e134, 1e135, 1e136, 1e137, 1e138, 1e139, - 1e140, 1e141, 1e142, 1e143, 1e144, 1e145, 1e146, 1e147, 1e148, 1e149, - 1e150, 1e151, 1e152, 1e153, 1e154, 1e155, 1e156, 1e157, 1e158, 1e159, -}; - -static double -pow10(int n) -{ - double d; - int neg; - - neg = 0; - if(n < 0){ - if(n < DBL_MIN_10_EXP){ - return 0.; - } - neg = 1; - n = -n; - }else if(n > DBL_MAX_10_EXP){ - return HUGE_VAL; - } - if(n < (int)(sizeof(pows10)/sizeof(pows10[0]))) - d = pows10[n]; - else{ - d = pows10[sizeof(pows10)/sizeof(pows10[0]) - 1]; - for(;;){ - n -= sizeof(pows10)/sizeof(pows10[0]) - 1; - if(n < (int)(sizeof(pows10)/sizeof(pows10[0]))){ - d *= pows10[n]; - break; - } - d *= pows10[sizeof(pows10)/sizeof(pows10[0]) - 1]; - } - } - if(neg){ - return 1./d; - } - return d; -} - -static int -xadd(char *a, int n, int v) -{ - char *b; - int c; - - if(n < 0 || n >= NSIGNIF) - return 0; - for(b = a+n; b >= a; b--) { - c = *b + v; - if(c <= '9') { - *b = c; - return 0; - } - *b = '0'; - v = 1; - } - *a = '1'; /* overflow adding */ - return 1; -} - -static int -xsub(char *a, int n, int v) -{ - char *b; - int c; - - for(b = a+n; b >= a; b--) { - c = *b - v; - if(c >= '0') { - *b = c; - return 0; - } - *b = '9'; - v = 1; - } - *a = '9'; /* underflow subtracting */ - return 1; -} - -static void -xaddexp(char *p, int e) -{ - char se[9]; - int i; - - *p++ = 'e'; - if(e < 0) { - *p++ = '-'; - e = -e; - } - i = 0; - while(e) { - se[i++] = e % 10 + '0'; - e /= 10; - } - if(i == 0) { - *p++ = '0'; - } else { - while(i > 0) - *p++ = se[--i]; - } - *p++ = '\0'; -} - -static char* -xdodtoa(char *s1, double f, int chr, int prec, int *decpt, int *rsign) -{ - char s2[NSIGNIF+10]; - double g, h; - int e, d, i; - int c2, sign, oerr; - - if(chr == 'F') - chr = 'f'; - if(prec > NSIGNIF) - prec = NSIGNIF; - if(prec < 0) - prec = 0; - if(__isNaN(f)) { - *decpt = 9999; - *rsign = 0; - strcpy(s1, "nan"); - return &s1[3]; - } - sign = 0; - if(f < 0) { - f = -f; - sign++; - } - *rsign = sign; - if(__isInf(f, 1) || __isInf(f, -1)) { - *decpt = 9999; - strcpy(s1, "inf"); - return &s1[3]; - } - - e = 0; - g = f; - if(g != 0) { - frexp(f, &e); - e = (int)(e * .301029995664); - if(e >= -150 && e <= +150) { - d = 0; - h = f; - } else { - d = e/2; - h = f * pow10(-d); - } - g = h * pow10(d-e); - while(g < 1) { - e--; - g = h * pow10(d-e); - } - while(g >= 10) { - e++; - g = h * pow10(d-e); - } - } - - /* - * convert NSIGNIF digits and convert - * back to get accuracy. - */ - for(i=0; i<NSIGNIF; i++) { - d = (int)g; - s1[i] = d + '0'; - g = (g - d) * 10; - } - s1[i] = 0; - - /* - * try decimal rounding to eliminate 9s - */ - c2 = prec + 1; - if(chr == 'f') - c2 += e; - oerr = errno; - if(c2 >= NSIGNIF-2) { - strcpy(s2, s1); - d = e; - s1[NSIGNIF-2] = '0'; - s1[NSIGNIF-1] = '0'; - xaddexp(s1+NSIGNIF, e-NSIGNIF+1); - g = fmtstrtod(s1, nil); - if(g == f) - goto found; - if(xadd(s1, NSIGNIF-3, 1)) { - e++; - xaddexp(s1+NSIGNIF, e-NSIGNIF+1); - } - g = fmtstrtod(s1, nil); - if(g == f) - goto found; - strcpy(s1, s2); - e = d; - } - - /* - * convert back so s1 gets exact answer - */ - for(d = 0; d < 10; d++) { - xaddexp(s1+NSIGNIF, e-NSIGNIF+1); - g = fmtstrtod(s1, nil); - if(f > g) { - if(xadd(s1, NSIGNIF-1, 1)) - e--; - continue; - } - if(f < g) { - if(xsub(s1, NSIGNIF-1, 1)) - e++; - continue; - } - break; - } - -found: - errno = oerr; - - /* - * sign - */ - d = 0; - i = 0; - - /* - * round & adjust 'f' digits - */ - c2 = prec + 1; - if(chr == 'f'){ - if(xadd(s1, c2+e, 5)) - e++; - c2 += e; - if(c2 < 0){ - c2 = 0; - e = -prec - 1; - } - }else{ - if(xadd(s1, c2, 5)) - e++; - } - if(c2 > NSIGNIF){ - c2 = NSIGNIF; - } - - *decpt = e + 1; - - /* - * terminate the converted digits - */ - s1[c2] = '\0'; - return &s1[c2]; -} - -/* - * this function works like the standard dtoa, if you want it. - */ -#if 0 -static char* -__dtoa(double f, int mode, int ndigits, int *decpt, int *rsign, char **rve) -{ - static char s2[NSIGNIF + 10]; - char *es; - int chr, prec; - - switch(mode) { - /* like 'e' */ - case 2: - case 4: - case 6: - case 8: - chr = 'e'; - break; - /* like 'g' */ - case 0: - case 1: - default: - chr = 'g'; - break; - /* like 'f' */ - case 3: - case 5: - case 7: - case 9: - chr = 'f'; - break; - } - - if(chr != 'f' && ndigits){ - ndigits--; - } - prec = ndigits; - if(prec > NSIGNIF) - prec = NSIGNIF; - if(ndigits == 0) - prec = NSIGNIF; - es = xdodtoa(s2, f, chr, prec, decpt, rsign); - - /* - * strip trailing 0 - */ - for(; es > s2 + 1; es--){ - if(es[-1] != '0'){ - break; - } - } - *es = '\0'; - if(rve != NULL) - *rve = es; - return s2; -} -#endif - -static int -fmtzdotpad(Fmt *f, int n, int pt) -{ - char *t, *s; - int i; - Rune *rt, *rs; - - if(f->runes){ - rt = (Rune*)f->to; - rs = (Rune*)f->stop; - for(i = 0; i < n; i++){ - if(i == pt){ - FMTRCHAR(f, rt, rs, '.'); - } - FMTRCHAR(f, rt, rs, '0'); - } - f->nfmt += rt - (Rune*)f->to; - f->to = rt; - }else{ - t = (char*)f->to; - s = (char*)f->stop; - for(i = 0; i < n; i++){ - if(i == pt){ - FMTCHAR(f, t, s, '.'); - } - FMTCHAR(f, t, s, '0'); - } - f->nfmt += t - (char *)f->to; - f->to = t; - } - return 0; -} - -int -__efgfmt(Fmt *fmt) -{ - double f; - char s1[NSIGNIF+10]; - int e, d, n; - int c1, c2, c3, c4, ucase, sign, chr, prec, fl; - - f = va_arg(fmt->args, double); - prec = FDEFLT; - fl = fmt->flags; - fmt->flags = 0; - if(fl & FmtPrec) - prec = fmt->prec; - chr = fmt->r; - ucase = 0; - if(chr == 'E'){ - chr = 'e'; - ucase = 1; - }else if(chr == 'F'){ - chr = 'f'; - ucase = 1; - }else if(chr == 'G'){ - chr = 'g'; - ucase = 1; - } - if(prec > 0 && chr == 'g') - prec--; - if(prec < 0) - prec = 0; - - xdodtoa(s1, f, chr, prec, &e, &sign); - e--; - if(*s1 == 'i' || *s1 == 'n'){ - if(ucase){ - if(*s1 == 'i'){ - strcpy(s1, "INF"); - }else{ - strcpy(s1, "NAN"); - } - } - fmt->flags = fl & (FmtWidth|FmtLeft); - return __fmtcpy(fmt, (const void*)s1, 3, 3); - } - - /* - * copy into final place - * c1 digits of leading '0' - * c2 digits from conversion - * c3 digits of trailing '0' - * c4 digits after '.' - */ - c1 = 0; - c2 = prec + 1; - c3 = 0; - c4 = prec; - switch(chr) { - default: - chr = 'e'; - break; - case 'g': - /* - * decide on 'e' of 'f' style convers - */ - if(e >= -4 && e <= prec) { - c1 = -e; - c4 = prec - e; - chr = 'h'; /* flag for 'f' style */ - } - break; - case 'f': - c1 = -e; - if(c1 > prec) - c1 = prec + 1; - c2 += e; - break; - } - - /* - * clean up c1 c2 and c3 - */ - if(c1 < 0) - c1 = 0; - if(c2 < 0) - c2 = 0; - if(c2 > NSIGNIF) { - c3 = c2-NSIGNIF; - c2 = NSIGNIF; - } - - /* - * trim trailing zeros for %g - */ - if(!(fl & FmtSharp) - && (chr == 'g' || chr == 'h')){ - if(c4 >= c3){ - c4 -= c3; - c3 = 0; - }else{ - c3 -= c4; - c4 = 0; - } - while(c4 && c2 > 1 && s1[c2 - 1] == '0'){ - c4--; - c2--; - } - } - - /* - * calculate the total length - */ - n = c1 + c2 + c3; - if(sign || (fl & (FmtSign|FmtSpace))) - n++; - if(c4 || (fl & FmtSharp)){ - n++; - } - if(chr == 'e' || chr == 'g'){ - n += 4; - if(e >= 100) - n++; - } - - /* - * pad to width if right justified - */ - if((fl & (FmtWidth|FmtLeft)) == FmtWidth && n < fmt->width){ - if(fl & FmtZero){ - c1 += fmt->width - n; - }else{ - if(__fmtpad(fmt, fmt->width - n) < 0){ - return -1; - } - } - } - - /* - * sign - */ - d = 0; - if(sign) - d = '-'; - else if(fl & FmtSign) - d = '+'; - else if(fl & FmtSpace) - d = ' '; - if(d && fmtrune(fmt, d) < 0){ - return -1; - } - - /* - * copy digits - */ - c4 = c1 + c2 + c3 - c4; - if(c1 > 0){ - if(fmtzdotpad(fmt, c1, c4) < 0){ - return -1; - } - c4 -= c1; - } - d = 0; - if(c4 >= 0 && c4 < c2){ - if(__fmtcpy(fmt, s1, c4, c4) < 0 || fmtrune(fmt, '.') < 0) - return -1; - d = c4; - c2 -= c4; - c4 = -1; - } - if(__fmtcpy(fmt, (const void*)(s1 + d), c2, c2) < 0){ - return -1; - } - c4 -= c2; - if(c3 > 0){ - if(fmtzdotpad(fmt, c3, c4) < 0){ - return -1; - } - c4 -= c3; - } - - /* - * strip trailing '0' on g conv - */ - if((fl & FmtSharp) && c4 == 0 && fmtrune(fmt, '.') < 0){ - return -1; - } - if(chr == 'e' || chr == 'g') { - d = 0; - if(ucase) - s1[d++] = 'E'; - else - s1[d++] = 'e'; - c1 = e; - if(c1 < 0) { - s1[d++] = '-'; - c1 = -c1; - } else - s1[d++] = '+'; - if(c1 >= 100) { - s1[d++] = c1/100 + '0'; - c1 = c1%100; - } - s1[d++] = c1/10 + '0'; - s1[d++] = c1%10 + '0'; - if(__fmtcpy(fmt, s1, d, d) < 0){ - return -1; - } - } - if((fl & (FmtWidth|FmtLeft)) == (FmtWidth|FmtLeft) && n < fmt->width){ - if(__fmtpad(fmt, fmt->width - n) < 0){ - return -1; - } - } - return 0; -} |