forked from KolibriOS/kolibrios
79 lines
1.2 KiB
C
79 lines
1.2 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#define LONG_MIN (-2147483647L-1)
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#define LONG_MAX (2147483647L)
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#define ULONG_MAX (4294967295UL)
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int getdigit(char ch, int base)
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{
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if (isdigit(ch)) ch-= '0';
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else
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if (isalpha(ch) && ch <= 'Z') ch = 10 + ch - 'A';
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else
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if (isalpha(ch)) ch = 10 + ch - 'a';
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else
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return -1;
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if (ch / base != 0) return -1;
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return ch;
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}
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long int strtol (const char* str, char** endptr, int base)
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{
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long int res = 0;
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int sign = 1;
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if (base > 36)
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{
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errno = EINVAL;
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goto bye;
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}
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while (isspace(*str)) str++;
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if (*str == '-') { sign = -1; str++; }
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else
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if (*str == '+') str++;
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if (base == 0 || base == 16)
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{
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if (*str == '0' && (str[1] == 'x' || str[1] == 'X'))
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{
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base = 16;
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str += 2;
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}
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}
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if (base == 0 && *str == '0') base = 8;
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if (base == 0) base = 10;
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int digit;
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while ((digit = getdigit(*str, base)) >= 0)
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{
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res = base * res + digit;
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str++;
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if (res < 0)
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{
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errno = ERANGE;
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if (sign > 0)
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res = LONG_MAX;
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else
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res = LONG_MIN;
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}
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}
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bye:
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if (endptr)
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*endptr = (char*)str;
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return res * sign;
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}
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