Half implemented printf (doesn't compile)
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ff5848de97
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@ -15,26 +15,29 @@ void puts(const char *str)
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}
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#define PRINTF_STATE_NORMAL 0
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#define PRINTF_STATE_LENGHT 1
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#define PRINTF_STATE_LENGHT_SHORT 2
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#define PRINTF_STATE_LENGHT_LONG 1
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#define PRINTF_STATE_LENGTH 1
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#define PRINTF_STATE_LENGTH_SHORT 2
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#define PRINTF_STATE_LENGTH_LONG 3
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#define PRINTF_STATE_SPEC 4
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#define PRINTF_LENGTH_DEFAULT 0
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#define PRINTF_LENGTH_SHORT_SHORT 1
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#define PRINTF_LENGTH_SHORT 2
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#define PRINTF_LENGTH_LONG 3
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#define PRINTF_LENGTH_LONG_LONG 4
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int* printf_number(int *argp, int length, bool sign, int radix)
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const char g_HexChars[] = '0123456789abcdef'
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int * printf_number(int *argp, int length, bool sign, int radix);
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void _cdecl printf(const char *fmt, ...)
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{
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int *argp = (int*)&fmt;
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int *argp = (int *)&fmt;
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int state = PRINTF_STATE_NORMAL;
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int length = PRINTF_LENGTH_DEFAULT;
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int radix = 10;
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bool sign = false;
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argp++;
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while (*fmt)
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{
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switch (state)
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@ -43,170 +46,204 @@ void _cdecl printf(const char *fmt, ...)
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switch (*fmt)
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{
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case '%':
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state = PRINTF_STATE_LENGHT;
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state = PRINTF_STATE_LENGTH;
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break;
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default:
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putc(*fmt);
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break;
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}
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case PRINTF_STATE_LENGHT:
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break;
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case PRINTF_STATE_LENGTH:
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switch (*fmt)
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{
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case 'h':
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length = PRINTF_LENGTH_SHORT;
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state = PRINTF_STATE_LENGHT_SHORT;
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state = PRINTF_STATE_LENGTH_SHORT;
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break;
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case 'l':
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case 'l':
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length = PRINTF_LENGTH_LONG;
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state = PRINTF_STATE_LENGHT_LONG;
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state = PRINTF_STATE_LENGTH_LONG;
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break;
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default:
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goto PRINTF_STATE_SPEC;
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goto PRINTF_STATE_SPEC_;
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}
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break;
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case PRINTF_LENGTH_SHORT:
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case PRINTF_STATE_LENGTH_SHORT:
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if (*fmt == 'h')
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{
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length = PRINTF_LENGTH_SHORT_SHORT;
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state = PRINTF_STATE_SPEC;
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}
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else
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{
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goto PRINTF_STATE_SPEC;
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}
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goto PRINTF_STATE_SPEC_;
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break;
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case PRINTF_STATE_LENGTH_LONG:
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if (*fmt == 'l')
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{
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length = PRINTF_LENGTH_LONG_LONG;
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state = PRINTF_STATE_SPEC;
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}
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else
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goto PRINTF_STATE_SPEC_;
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break;
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case PRINTF_STATE_SPEC:
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PRINTF_STATE_SPEC_:
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switch (*fmt)
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{
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case 'c':
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putc((char)*argp);
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case 'c':
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putc((char)*argp);
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argp++;
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break;
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case 's':
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if (length == PRINTF_LENGTH_LONG || length == PRINTF_LENGTH_LONG_LONG)
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{
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puts_f(*(const char far **)argp);
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argp += 2;
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}
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else
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{
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puts(*(const char **)argp);
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argp++;
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break;
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case 's':
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puts(*(char **)argp);
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argp++;
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break;
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case '%':
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putc('%');
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break;
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case 'd':
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case 'i':
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radix = 10;
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sign = true;
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argp = printf_number(argp, length, sign, radix);
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break;
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case 'u':
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radix = 10;
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sign = false;
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argp = printf_number(argp, length, sign, radix);
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break;
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case 'x':
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case 'X':
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case 'p':
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radix = 16;
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sign = false;
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argp = printf_number(argp, length, sign, radix);
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break;
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case 'o':
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radix = 8;
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sign = false;
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argp = printf_number(argp, length, sign, radix);
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break;
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//Se è messo un carattere non valido questo codice fa in modo che li ignora.
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default:
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break;
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}
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break;
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case '%':
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putc('%');
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break;
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case 'd':
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case 'i':
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radix = 10;
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sign = true;
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argp = printf_number(argp, length, sign, radix);
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break;
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case 'u':
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radix = 10;
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sign = false;
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argp = printf_number(argp, length, sign, radix);
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break;
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case 'X':
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case 'x':
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case 'p':
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radix = 16;
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sign = false;
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argp = printf_number(argp, length, sign, radix);
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break;
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case 'o':
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radix = 8;
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sign = false;
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argp = printf_number(argp, length, sign, radix);
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break;
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// ignore invalid spec
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default:
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break;
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}
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//Porta le variabili allo stato di default / normale.
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// reset state
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state = PRINTF_STATE_NORMAL;
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length = PRINTF_LENGTH_DEFAULT;
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radix = 10;
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sign = false;
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break;
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}
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fmt++;
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}
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}
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int* printf_number(int* argp, int length, bool sign, int radix)
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const char g_HexChars[] = "0123456789abcdef";
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int *printf_number(int *argp, int length, bool sign, int radix)
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{
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char buffer[32];
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unsigned long long number;
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int number_sign = 1;
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int pos = 0;
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// process length
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switch (length)
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{
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case PRINTF_LENGTH_SHORT_SHORT:
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case PRINTF_LENGTH_SHORT:
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case PRINTF_LENGTH_LONG:
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if (sign)
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case PRINTF_LENGTH_SHORT_SHORT:
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case PRINTF_LENGTH_SHORT:
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case PRINTF_LENGTH_DEFAULT:
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if (sign)
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{
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int n = *argp;
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if (n < 0)
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{
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long int n = *(long int*)argp;
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if (n < 0)
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{
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n = -n;
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number_sign = -1;
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}
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number = (unsigned long long)n;
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n = -n;
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number_sign = -1;
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}
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else
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{
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number = (*unsigned long int*)argp;
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}
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argp += 2;
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break;
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case PRINTF_LENGTH_LONG_LONG:
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if (sign)
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{
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long long int n = *(long long int*)argp;
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if (n < 0)
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{
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n = -n;
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number_sign = -1;
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}
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number = (unsigned long long)n;
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}
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else
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{
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number = (*unsigned long long int *)argp;
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}
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argp += 4;
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break;
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case PRINTF_LENGTH_DEFAULT:
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if (sign)
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{
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int n = *argp;
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if (n < 0)
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{
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n = -n;
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number_sign = -1;
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}
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number = n;
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}
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else
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{
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number = (*unsigned int*)argp;
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number = (unsigned long long)n;
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}
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else
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{
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number = *(unsigned int *)argp;
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}
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argp++;
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break;
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case PRINTF_LENGTH_LONG:
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if (sign)
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{
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long int n = *(long int *)argp;
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if (n < 0)
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{
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n = -n;
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number_sign = -1;
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}
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argp++;
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break;
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number = (unsigned long long)n;
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}
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else
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{
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number = *(unsigned long int *)argp;
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}
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argp += 2;
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break;
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case PRINTF_LENGTH_LONG_LONG:
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if (sign)
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{
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long long int n = *(long long int *)argp;
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if (n < 0)
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{
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n = -n;
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number_sign = -1;
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}
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number = (unsigned long long)n;
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}
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else
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{
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number = *(unsigned long long int *)argp;
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}
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argp += 4;
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break;
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}
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// convert number to ASCII
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do
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{
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uint32_t rem = number % radix;
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uint32_t rem;
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x86_div64_32(number, radix, &number, &rem);
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buffer[pos++] = g_HexChars[rem];
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} while (number > 0);
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// add sign
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if (sign && number_sign < 0)
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{
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buffer[pos++] = '-';
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}
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// print number in reverse order
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while (--pos >= 0)
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putc(buffer[pos]);
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return argp;
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}
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