sdcc/support/regression/tests/bug3475656.c

   1 /*
   2   bug3475656.c
   3
   4   Digits in output were reversed (e.g. 192 was written as "291").
   5 */
   6
   7 #include <testfwk.h>
   8
   9 #ifdef __SDCC
  10 #pragma disable_warning 85
  11 #endif
  12
  13 #define UCHAR   unsigned char
  14 #define USHORT  unsigned short
  15 #define PCHAR   unsigned char *
  16
  17 UCHAR mod_16x8(USHORT s16, UCHAR i8)
  18 {
  19     return(s16 % i8);
  20 }
  21
  22 USHORT div_16x8(USHORT s16, UCHAR i8)
  23 {
  24     return(s16 / i8);
  25 }
  26
  27 #if 1
  28 void itoa(USHORT sVal, PCHAR pBuf, UCHAR iRadix)
  29 {
  30     PCHAR p;            // pointer to traverse string
  31     PCHAR pFirstDigit;  // pointer to first digit
  32     UCHAR iTmp;         // temp UCHAR
  33
  34     p = pBuf;
  35     pFirstDigit = p;    // save pointer to first digit
  36
  37     do
  38     {
  39         iTmp = mod_16x8(sVal, iRadix);
  40         sVal = div_16x8(sVal, iRadix);
  41
  42         // convert to ascii and store
  43         *p++ = (iTmp > 9) ? iTmp - 10 + 'A' : iTmp + '0';  // a letter or a digit
  44     } while (sVal > 0);
  45
  46     // We now have the digit of the number in the buffer, but in reverse order.  Thus we reverse them now.
  47
  48     *p-- = '\0';               // terminate string; p points to last digit
  49
  50     do
  51     {
  52         iTmp = *p;
  53         *p = *pFirstDigit;
  54         *pFirstDigit = iTmp;   // swap *p and *pFirstDigit
  55         --p;
  56         ++pFirstDigit;         // advance to next two digits
  57     } while (pFirstDigit < p); // repeat until halfway
  58 }
  59 #endif
  60
  61 void testBug(void)
  62 {
  63     unsigned char c[8];
  64     unsigned short i;
  65
  66     i = 192;
  67 #if 1
  68     itoa(i, c, 10);
  69     ASSERT(c[0] == '1');
  70     ASSERT(c[1] == '9');
  71     ASSERT(c[2] == '2');
  72 #endif
  73 }