Rev 1619 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* Project: OSLib |
| 2 | * Description: The OS Construction Kit |
||
| 3 | * Date: 1.6.2000 |
||
| 4 | * Idea by: Luca Abeni & Gerardo Lamastra |
||
| 5 | * |
||
| 6 | * OSLib is an SO project aimed at developing a common, easy-to-use |
||
| 7 | * low-level infrastructure for developing OS kernels and Embedded |
||
| 8 | * Applications; it partially derives from the HARTIK project but it |
||
| 9 | * currently is independently developed. |
||
| 10 | * |
||
| 11 | * OSLib is distributed under GPL License, and some of its code has |
||
| 12 | * been derived from the Linux kernel source; also some important |
||
| 13 | * ideas come from studying the DJGPP go32 extender. |
||
| 14 | * |
||
| 15 | * We acknowledge the Linux Community, Free Software Foundation, |
||
| 16 | * D.J. Delorie and all the other developers who believe in the |
||
| 17 | * freedom of software and ideas. |
||
| 18 | * |
||
| 19 | * For legalese, check out the included GPL license. |
||
| 20 | */ |
||
| 21 | |||
| 1621 | fabio | 22 | #include <arch/i386/stdlib.h> |
| 23 | #include <arch/i386/string.h> |
||
| 24 | #include <arch/i386/limits.h> |
||
| 25 | #include <arch/i386/float.h> |
||
| 2 | pj | 26 | #include <ll/i386/mem.h> |
| 1621 | fabio | 27 | #include <arch/stdarg.h> |
| 28 | #include <arch/ctype.h> |
||
| 29 | #include <arch/math.h> |
||
| 2 | pj | 30 | #include "sprintf.h" |
| 31 | |||
| 32 | FILE(fcvt); |
||
| 33 | |||
| 34 | unsigned fcvt(double v,char *buffer,int width,int prec,int flag) |
||
| 35 | { |
||
| 36 | double ip,fp,val; |
||
| 37 | register int l=0; |
||
| 38 | register int digits; |
||
| 39 | int conv,got_a_digit,exceeded,len = 0; |
||
| 40 | char tmp[300]; |
||
| 41 | memset(tmp,0,300); |
||
| 42 | /* Manage Inf & NaN */ |
||
| 43 | if (isspecial(v,buffer)) return(strlen(buffer)); |
||
| 44 | /* Check for negative value & add optional + sign */ |
||
| 45 | if (v < 0) { |
||
| 46 | *buffer++ = '-'; |
||
| 47 | v = -v; |
||
| 48 | len++; |
||
| 49 | } else if (flag & ADD_PLUS) { |
||
| 50 | *buffer++ = '+'; |
||
| 51 | len++; |
||
| 52 | } |
||
| 53 | /* Extract integer part & mantissa */ |
||
| 54 | fp = modf(v,&ip); |
||
| 55 | /* Process integer part */ |
||
| 56 | digits = 0; |
||
| 57 | if (ip >= 1.0) { |
||
| 58 | while (ip >= 1.0) { |
||
| 59 | /* The 0.01 here is used to correct rounding errors*/ |
||
| 60 | /* Ex: 1.2 --> 1.1999999999999... adjust to 1.2 */ |
||
| 61 | /* |
||
| 62 | ip = ip / 10.0; |
||
| 63 | modf(ip,&val); |
||
| 64 | val = (ip - val)*10.0; |
||
| 65 | */ |
||
| 66 | val = fmod(ip,10.0); |
||
| 67 | ip = ip / 10.0; |
||
| 68 | tmp[digits++] = todigit((unsigned)(val)); |
||
| 69 | } |
||
| 70 | len += digits; |
||
| 71 | /* Now reverse the temporary buffer into output buffer */ |
||
| 72 | /* Translate only the last 15 digits */ |
||
| 73 | /* The others are beyond double precision limit! */ |
||
| 74 | for (l = digits-1; l >= max(digits-15,0); l--) *buffer++ = tmp[l]; |
||
| 75 | if (l >= 0) for (l = digits-16; l >= 0; l--) *buffer++ = '0'; |
||
| 76 | *buffer = 0; |
||
| 77 | /* If IP == 0 -> just put in a 0 */ |
||
| 78 | } else { |
||
| 79 | *buffer++ = '0'; |
||
| 80 | len++; |
||
| 81 | } |
||
| 82 | /* Process fractionary part according to width specification */ |
||
| 83 | /* If RESPECT_WIDTH is set, scan until you reach wanted precision */ |
||
| 84 | /* Else scan until you find a not 0 digit */ |
||
| 85 | if (fp > 1e-307 && len < width+1) { |
||
| 86 | *buffer++ = '.'; |
||
| 87 | len++; |
||
| 88 | if (flag & RESPECT_WIDTH) got_a_digit = 1; |
||
| 89 | else got_a_digit = 0; |
||
| 90 | exceeded = 0; |
||
| 91 | digits = 1; |
||
| 92 | while (!exceeded) { |
||
| 93 | /* The DBL_EPSILON here is used to correct rounding errors */ |
||
| 94 | fp = (fp + DBL_EPSILON) * 10.0; |
||
| 95 | fp = modf(fp,&ip); |
||
| 96 | conv = (int)(ip); |
||
| 97 | if (conv != 0 && !got_a_digit) got_a_digit = 1; |
||
| 98 | *buffer++ = todigit(conv); |
||
| 99 | len++; |
||
| 100 | digits++; |
||
| 101 | if (got_a_digit && (digits > prec)) exceeded = 1; |
||
| 102 | if (width < len) exceeded = 1; |
||
| 103 | } |
||
| 104 | /* Drop trailing zeros after decimal point */ |
||
| 105 | while (*--buffer == '0' && *(buffer-1) != '.') len--; |
||
| 106 | buffer++; |
||
| 107 | } |
||
| 108 | *buffer = 0; |
||
| 109 | return(len); |
||
| 110 | } |
||
| 111 | |||
| 112 |