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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* Project: OSLib |
| 2 | * Description: The OS Construction Kit |
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| 3 | * Date: 1.6.2000 |
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| 4 | * Idea by: Luca Abeni & Gerardo Lamastra |
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| 5 | * |
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| 6 | * OSLib is an SO project aimed at developing a common, easy-to-use |
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| 7 | * low-level infrastructure for developing OS kernels and Embedded |
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| 8 | * Applications; it partially derives from the HARTIK project but it |
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| 9 | * currently is independently developed. |
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| 10 | * |
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| 11 | * OSLib is distributed under GPL License, and some of its code has |
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| 12 | * been derived from the Linux kernel source; also some important |
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| 13 | * ideas come from studying the DJGPP go32 extender. |
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| 14 | * |
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| 15 | * We acknowledge the Linux Community, Free Software Foundation, |
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| 16 | * D.J. Delorie and all the other developers who believe in the |
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| 17 | * freedom of software and ideas. |
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| 18 | * |
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| 19 | * For legalese, check out the included GPL license. |
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| 20 | */ |
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| 21 | |||
| 22 | |||
| 23 | #include <ll/i386/stdlib.h> |
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| 24 | #include <ll/i386/string.h> |
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| 25 | #include <ll/i386/limits.h> |
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| 26 | #include <ll/i386/float.h> |
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| 27 | #include <ll/i386/mem.h> |
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| 28 | #include <ll/stdarg.h> |
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| 29 | #include <ll/ctype.h> |
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| 30 | #include <ll/math.h> |
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| 31 | #include "sprintf.h" |
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| 32 | |||
| 33 | FILE(ecvt); |
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| 34 | |||
| 35 | unsigned ecvt(double v,char *buffer,int width,int prec,int flag) |
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| 36 | { |
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| 37 | register int len=0; |
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| 38 | long int exponent,abs_exponent; |
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| 39 | /* Manage Inf & NaN */ |
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| 40 | if (isspecial(v,buffer)) return(strlen(buffer)); |
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| 41 | /* Check for negative value & add optional + sign */ |
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| 42 | if (v < 0) { |
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| 43 | *buffer++ = '-'; |
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| 44 | v = -v; |
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| 45 | len++; |
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| 46 | } else if (flag & ADD_PLUS) { |
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| 47 | *buffer++ = '+'; |
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| 48 | len++; |
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| 49 | } |
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| 50 | /* Zero check! */ |
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| 51 | if (v < DBL_MIN) { |
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| 52 | *buffer++ = '0'; |
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| 53 | *buffer = 0; |
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| 54 | return(1); |
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| 55 | } |
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| 56 | /* Evaluate the exponent */ |
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| 57 | if (v < 1) { |
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| 58 | exponent = 0; |
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| 59 | while (v < 1.0) { |
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| 60 | v *= 10.0; |
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| 61 | exponent--; |
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| 62 | } |
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| 63 | } |
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| 64 | else { |
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| 65 | exponent = 0; |
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| 66 | while (v >= 10.0) { |
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| 67 | v /= 10.0; |
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| 68 | exponent++; |
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| 69 | } |
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| 70 | } |
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| 71 | abs_exponent = abs(exponent); |
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| 72 | if (abs_exponent > 99) width -= 3; |
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| 73 | else if (abs_exponent > 9) width -= 2; |
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| 74 | else if (exponent > 0) width -= 1; |
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| 75 | /* Now the number as IP in range [0,1] */ |
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| 76 | /* Convert this as a fixed point format */ |
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| 77 | len += fcvt(v,buffer,width,prec,flag | RESPECT_WIDTH); |
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| 78 | /* Now convert the exponent */ |
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| 79 | if (exponent == 0) return(len); |
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| 80 | buffer += len; |
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| 81 | *buffer++ = 'e'; |
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| 82 | len += dcvt(exponent,buffer,10,exponent/10+2,ADD_PLUS)+1; |
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| 83 | return(len); |
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| 84 | } |