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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6536 | serge | 1 | /* |
| 2 | FUNCTION |
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| 3 | < |
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| 4 | |||
| 5 | INDEX |
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| 6 | itoa |
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| 7 | |||
| 8 | ANSI_SYNOPSIS |
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| 9 | #include |
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| 10 | char *itoa(int <[value]>, char *<[str]>, int <[base]>); |
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| 11 | char *__itoa(int <[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 | If <[base]> is 10, <[value]> is treated as signed and the string will be |
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| 17 | prefixed with '-' if negative. For all other bases, <[value]> is treated as |
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| 18 | unsigned. <[str]> should be an array long enough to contain the converted |
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| 19 | value, which in the worst case is sizeof(int)*8+1 bytes. |
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| 20 | |||
| 21 | RETURNS |
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| 22 | A pointer to the string, <[str]>, or NULL if <[base]> is invalid. |
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| 23 | |||
| 24 | PORTABILITY |
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| 25 | < |
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| 26 | |||
| 27 | No supporting OS subroutine calls are required. |
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| 28 | */ |
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| 29 | |||
| 30 | #include |
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| 31 | |||
| 32 | char * |
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| 33 | _DEFUN (__itoa, (value, str, base), |
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| 34 | int value _AND |
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| 35 | char *str _AND |
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| 36 | int base) |
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| 37 | { |
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| 38 | unsigned uvalue; |
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| 39 | int i = 0; |
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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 | /* Negative numbers are only supported for decimal. |
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| 49 | * Cast to unsigned to avoid overflow for maximum negative value. */ |
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| 50 | if ((base == 10) && (value < 0)) |
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| 51 | { |
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| 52 | str[i++] = '-'; |
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| 53 | uvalue = (unsigned)-value; |
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| 54 | } |
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| 55 | else |
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| 56 | uvalue = (unsigned)value; |
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| 57 | |||
| 58 | __utoa (uvalue, &str[i], base); |
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| 59 | return str; |
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| 60 | } |
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| 61 | |||
| 62 | char * |
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| 63 | _DEFUN (itoa, (value, str, base), |
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| 64 | int value _AND |
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| 65 | char *str _AND |
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| 66 | int base) |
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| 67 | { |
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| 68 | return __itoa (value, str, base); |
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| 69 | } |