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  1. #include <limits.h>
  2. #include <assert.h>
  3. #include <stdio.h>
  4.  
  5. unsigned pad(unsigned pattern, unsigned patternLen,
  6.              unsigned leftBit, unsigned leftBitCnt,
  7.              unsigned rightBit, unsigned rightBitCnt)
  8. {
  9.   unsigned r;
  10.   assert(leftBitCnt < sizeof(unsigned) * CHAR_BIT);
  11.   assert(rightBitCnt < sizeof(unsigned) * CHAR_BIT);
  12.   assert(patternLen < sizeof(unsigned) * CHAR_BIT);
  13.   assert(leftBitCnt + patternLen + rightBitCnt <= sizeof(unsigned) * CHAR_BIT);
  14.  
  15.   r = (leftBit << leftBitCnt) - leftBit;
  16.   r <<= patternLen;
  17.   r |= pattern;
  18.   r <<= rightBitCnt;
  19.   r |= (rightBit << rightBitCnt) - rightBit;
  20.  
  21.   return r;
  22. }
  23.  
  24. void printBin(unsigned x)
  25. {
  26.   unsigned i;
  27.   for (i = 0; i < sizeof(unsigned) * CHAR_BIT; i++)
  28.     printf("%u", (x >> (sizeof(unsigned) * CHAR_BIT - 1 - i)) & 1);
  29.   printf("\n");
  30. }
  31.  
  32. int main(void)
  33. {
  34.   printBin(pad(0x0F0, 12, 0, 2, 0, 2));
  35.   printBin(pad(0x0F0, 12, 0, 2, 1, 2));
  36.   printBin(pad(0x0F0, 12, 1, 2, 0, 2));
  37.   printBin(pad(0x0F0, 12, 1, 2, 1, 2));
  38.   return 0;
  39. }
  40.  
Success #stdin #stdout 0.02s 1676KB
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stdin
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Standard input is empty
stdout
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00000000000000000000001111000000
00000000000000000000001111000011
00000000000000001100001111000000
00000000000000001100001111000011
https://ideone.com/ocvhz
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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