82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Authors: spectral` //
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// NeoX //
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// //
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// Desc: Conversion utilities - itoa family //
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//----------------------------------------------------------------------------//
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#include <kaleid.h>
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//
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// Digits table for bases <=36
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//
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static const char digits[] =
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"0123456789abcdefghijklmnopqrstuvwxyz";
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//
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// Integer to string in any base between 2 and 36 (included)
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//
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#if defined(_NEED_ITOA)
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char *itoa(int i, char *str, int base)
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#elif defined(_NEED_LTOA)
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char *ltoa(long i, char *str, int base)
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#elif defined(_NEED_UTOA)
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char *utoa(uint i, char *str, int base)
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#elif defined(_NEED_ULTOA)
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char *ultoa(ulong i, char *str, int base)
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#else
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#error "What am I supposed to declare?"
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#endif
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{
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#if defined(_NEED_ITOA) || defined(_NEED_LTOA)
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int neg = 0;
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#endif
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char *orig = str;
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//
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// Only handle base 2 -> 36
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//
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if (base < 2 || base > 36)
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return NULL;
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#if defined(_NEED_ITOA) || defined(_NEED_LTOA)
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//
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// Deal with negatives
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//
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if (i < 0) {
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neg = 1;
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i = -i;
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}
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#endif
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//
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// Deal with zero separately
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//
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if (i == 0) {
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*str++ = '0';
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}
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//
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// Compute digits... in reverse order
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//
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while (i > 0) {
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*str++ = digits[i % base];
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i /= base;
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}
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#if defined(_NEED_ITOA) || defined(_NEED_LTOA)
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if (neg) *str++ = '-';
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#endif
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*str = '\0';
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//
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// Reverse the string
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//
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return strrev2(orig);
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}
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