63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
#include <stdlib.h>
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#include "dtypes.h"
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char *int2str(char *dest, size_t len, int64_t num, uint32_t base)
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{
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int i = len-1, neg = 0;
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int64_t b = (int64_t)base;
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char ch;
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if (num < 0) {
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num = -num;
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neg = 1;
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}
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dest[i--] = '\0';
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while (i >= 0) {
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ch = (char)(num % b);
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if (ch < 10)
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ch += '0';
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else
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ch = ch-10+'a';
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dest[i--] = ch;
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num /= b;
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if (num == 0)
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break;
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}
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if (i >= 0 && neg)
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dest[i--] = '-';
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return &dest[i+1];
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}
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int isdigit_base(char c, int base)
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{
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if (base < 11)
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return (c >= '0' && c < '0'+base);
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return ((c >= '0' && c <= '9') ||
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(c >= 'a' && c < 'a'+base-10) ||
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(c >= 'A' && c < 'A'+base-10));
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}
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/* assumes valid base, returns 1 on error, 0 if OK */
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int str2int(char *str, size_t len, int64_t *res, uint32_t base)
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{
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int64_t result, place;
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char digit;
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int i;
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place = 1; result = 0;
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for(i=len-1; i>=0; i--) {
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digit = str[i];
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if (!isdigit_base(digit, base))
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return 1;
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if (digit <= '9')
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digit -= '0';
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else if (digit >= 'a')
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digit = digit-'a'+10;
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else if (digit >= 'A')
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digit = digit-'A'+10;
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result += digit * place;
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place *= base;
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}
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*res = result;
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return 0;
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}
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