| … | |
… | |
| 948 | } |
948 | } |
| 949 | |
949 | |
| 950 | /*******************************************************************************/ |
950 | /*******************************************************************************/ |
| 951 | /* fast integer to ascii */ |
951 | /* fast integer to ascii */ |
| 952 | |
952 | |
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953 | /* |
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954 | * This code is pretty complicated because it is general. The idea behind it, |
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955 | * however, is pretty simple: first, the number is multiplied with a scaling |
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956 | * factor (2**bits / 10**(digits-1)) to convert nthe integer into a fixed-point |
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957 | * number with the first digit in the upper bits. |
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958 | * Then this digit is converted to text and masked out. The resulting number |
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959 | * is then multiplied by 10, by multiplying the fixed point representation |
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960 | * by 5 and shifting the (binary) decimal point one to the right, so a 4.28 |
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961 | * format becomes 5.27, 6.26 and so on. |
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962 | * The rest involves only advancing the pointer if we already generated a |
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963 | * non-zero digit, so leading zeroes are overwritten. |
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964 | */ |
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965 | |
| 953 | // simply return a mask with "bits" bits set |
966 | // simply return a mask with "bits" bits set |
| 954 | #define ecb_i2a_mask(type,bits) ((((type)1) << (bits)) - 1) |
967 | #define ecb_i2a_mask(type,bits) ((((type)1) << (bits)) - 1) |
| 955 | |
968 | |
| 956 | // oputput a single digit. maskvalue is 10**digitidx |
969 | // oputput a single digit. maskvalue is 10**digitidx |
| 957 | #define ecb_i2a_digit(type,bits,digitmask,maskvalue,digitidx) \ |
970 | #define ecb_i2a_digit(type,bits,digitmask,maskvalue,digitidx) \ |
