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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 | #include <ll/ctype.h> |
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| 23 | #include <ll/i386/string.h> |
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| 24 | |||
| 25 | FILE(IsSpecial); |
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| 26 | |||
| 27 | int isspecial(double d, char *bufp) |
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| 28 | { |
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| 29 | /* IEEE standard number rapresentation */ |
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| 30 | register struct IEEEdp { |
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| 31 | unsigned manl:32; |
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| 32 | unsigned manh:20; |
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| 33 | unsigned exp:11; |
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| 34 | unsigned sign:1; |
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| 35 | } *ip = (struct IEEEdp *) &d; |
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| 36 | |||
| 37 | if (ip->exp != 0x7ff) |
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| 38 | return (0); |
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| 39 | if (ip->manh || ip->manl) { |
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| 40 | if (bufp != NULL) |
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| 41 | strcpy(bufp, "NaN"); |
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| 42 | return (1); |
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| 43 | } else if (ip->sign) { |
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| 44 | if (bufp != NULL) |
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| 45 | strcpy(bufp, "+Inf"); |
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| 46 | return (2); |
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| 47 | } else { |
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| 48 | if (bufp != NULL) |
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| 49 | strcpy(bufp, "-Inf"); |
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| 50 | return (3); |
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| 51 | } |
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| 52 | } |