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6536 | serge | 1 | /* |
2 | FUNCTION |
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3 | < |
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4 | |||
5 | INDEX |
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6 | utoa |
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7 | |||
8 | ANSI_SYNOPSIS |
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9 | #include |
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10 | char *utoa(unsigned <[value]>, char *<[str]>, int <[base]>); |
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11 | char *__utoa(unsigned <[value]>, char *<[str]>, int <[base]>); |
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12 | |||
13 | DESCRIPTION |
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14 | < |
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15 | using the specified base, which must be between 2 and 36, inclusive. |
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16 | <[str]> should be an array long enough to contain the converted |
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17 | value, which in the worst case is sizeof(int)*8+1 bytes. |
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18 | |||
19 | RETURNS |
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20 | A pointer to the string, <[str]>, or NULL if <[base]> is invalid. |
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21 | |||
22 | PORTABILITY |
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23 | < |
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24 | |||
25 | No supporting OS subroutine calls are required. |
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26 | */ |
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27 | |||
28 | #include |
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29 | |||
30 | char * |
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31 | _DEFUN (__utoa, (value, str, base), |
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32 | unsigned value _AND |
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33 | char *str _AND |
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34 | int base) |
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35 | { |
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36 | const char digits[] = "0123456789abcdefghijklmnopqrstuvwxyz"; |
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37 | int i, j; |
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38 | unsigned remainder; |
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39 | char c; |
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40 | |||
41 | /* Check base is supported. */ |
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42 | if ((base < 2) || (base > 36)) |
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43 | { |
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44 | str[0] = '\0'; |
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45 | return NULL; |
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46 | } |
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47 | |||
48 | /* Convert to string. Digits are in reverse order. */ |
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49 | i = 0; |
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50 | do |
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51 | { |
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52 | remainder = value % base; |
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53 | str[i++] = digits[remainder]; |
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54 | value = value / base; |
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55 | } while (value != 0); |
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56 | str[i] = '\0'; |
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57 | |||
58 | /* Reverse string. */ |
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59 | for (j = 0, i--; j < i; j++, i--) |
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60 | { |
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61 | c = str[j]; |
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62 | str[j] = str[i]; |
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63 | str[i] = c; |
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64 | } |
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65 | |||
66 | return str; |
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67 | } |
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68 | |||
69 | char * |
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70 | _DEFUN (utoa, (value, str, base), |
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71 | unsigned value _AND |
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72 | char *str _AND |
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73 | int base) |
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74 | { |
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75 | return __utoa (value, str, base); |
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76 | }>> |