111 lines
2.4 KiB
C
111 lines
2.4 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 <kalbase.h>
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// Digits table for bases <=36 (unused)
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#if 0
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static const char digits[] =
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"0123456789abcdefghijklmnopqrstuvwxyz";
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#endif
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//
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// Integer to string in any base between 2 and 36 (included)
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// Returns str
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//
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#if defined(_NEED_ITOA)
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#define _IL_MIN INT_MIN
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#define _IL_MIN_STRING "-2147483648"
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char *itoa(int i, char *str, int base)
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{
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int rem;
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#elif defined(_NEED_LTOA)
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#define _IL_MIN LONG_MIN
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#define _IL_MIN_STRING "-9223372036854775808"
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char *ltoa(long i, char *str, int base)
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{
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long rem;
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#elif defined(_NEED_UTOA)
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char *utoa(uint i, char *str, int base)
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{
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uint rem;
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#elif defined(_NEED_ULTOA)
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char *ultoa(ulong i, char *str, int base)
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{
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ulong rem;
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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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char *orig = str;
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#if defined(_NEED_ITOA) || defined(_NEED_LTOA)
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// Deal with negatives
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int neg = 0;
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if (i < 0 && base == 10) {
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// Handle INT_MIN and LONG_MIN...
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if (__builtin_expect(i == _IL_MIN, 0)) {
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strcpy(orig, _IL_MIN_STRING);
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goto leave;
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}
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else {
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neg = 1;
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i = -i;
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}
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}
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#endif
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// Only handle base 2 -> 36
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if (base < 2 || base > 36) {
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__set_errno(EINVAL);
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*orig = '\0';
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goto leave;
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}
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// Deal with zero separately
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if (i == 0) {
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*str++ = '0';
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*str = '\0';
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goto leave;
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}
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// Compute digits... in reverse order
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while (i > 0) {
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rem = i % base;
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*str++ = (rem > 9)
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? (rem - 10) + 'a'
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: rem + '0';
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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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// Reverse the string
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orig = strrev2(orig);
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// End of conversion
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leave:
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return orig;
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}
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