Last change
on this file since 577 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.4 KB
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Line | |
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1 | /* l64a - convert long to radix-64 ascii string |
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2 | * |
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3 | * Conversion is performed on at most 32-bits of input value starting |
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4 | * from least significant bits to the most significant bits. |
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5 | * |
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6 | * The routine splits the input value into groups of 6 bits for up to |
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7 | * 32 bits of input. This means that the last group may be 2 bits |
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8 | * (bits 30 and 31). |
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9 | * |
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10 | * Each group of 6 bits forms a value from 0-63 which is converted into |
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11 | * a character as follows: |
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12 | * 0 = '.' |
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13 | * 1 = '/' |
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14 | * 2-11 = '0' to '9' |
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15 | * 12-37 = 'A' to 'Z' |
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16 | * 38-63 = 'a' to 'z' |
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17 | * |
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18 | * When the remaining bits are zero or all 32 bits have been translated, |
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19 | * a nul terminator is appended to the resulting string. An input value of |
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20 | * 0 results in an empty string. |
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21 | */ |
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22 | |
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23 | #include <_ansi.h> |
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24 | #include <stdlib.h> |
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25 | #include <reent.h> |
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26 | |
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27 | static const char R64_ARRAY[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
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28 | |
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29 | char * |
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30 | l64a (long value) |
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31 | { |
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32 | return _l64a_r (_REENT, value); |
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33 | } |
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34 | |
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35 | char * |
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36 | _l64a_r (struct _reent *rptr, |
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37 | long value) |
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38 | { |
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39 | char *ptr; |
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40 | char *result; |
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41 | int i, index; |
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42 | unsigned long tmp = (unsigned long)value & 0xffffffff; |
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43 | |
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44 | _REENT_CHECK_MISC(rptr); |
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45 | result = _REENT_L64A_BUF(rptr); |
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46 | ptr = result; |
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47 | |
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48 | for (i = 0; i < 6; ++i) |
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49 | { |
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50 | if (tmp == 0) |
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51 | { |
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52 | *ptr = '\0'; |
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53 | break; |
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54 | } |
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55 | |
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56 | index = tmp & (64 - 1); |
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57 | *ptr++ = R64_ARRAY[index]; |
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58 | tmp >>= 6; |
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59 | } |
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60 | |
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61 | return result; |
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62 | } |
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