Finding occurrences of one wide character string in another - C Data Type

C examples for Data Type:Wide Character

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Description

Finding occurrences of one wide character string in another

Demo Code

#include <stdio.h>
#include <wchar.h>
#include <wctype.h>

#define TEXT_SIZE   100/*w ww  . j ava  2  s.  c  om*/
#define SUBSTR_SIZE  40

wchar_t *wstr_towupper(wchar_t *wstr, size_t size);   // Wide string to uppercase

int main(void)
{
  wchar_t text[TEXT_SIZE];                            // Input buffer for string to be searched
  wchar_t substr[SUBSTR_SIZE];                        // Input buffer for string sought

  wprintf(L"Enter the string to be searched (less than %d characters):\n", TEXT_SIZE);
  fgetws(text, TEXT_SIZE, stdin);
  wprintf(L"\nEnter the string sought (less than %d characters):\n", SUBSTR_SIZE);
  fgetws(substr, SUBSTR_SIZE, stdin);

  // Overwrite the newline character in each string
  int textlen = wcsnlen(text, sizeof(text)/sizeof(wchar_t));
  int substrlen = wcsnlen(substr, sizeof(substr)/sizeof(wchar_t));
  text[--textlen] = L'\0';
  substr[--substrlen] = L'\0';

  fwprintf(stdout, L"\nFirst string entered:\n%ls\n", text);
  fwprintf(stdout, L"Second string entered:\n%ls\n", substr);

  // Convert both strings to uppercase
  wstr_towupper(text, sizeof(text)/sizeof(wchar_t));
  wstr_towupper(substr, sizeof(substr)/sizeof(wchar_t));

  // Count the appearances of substr in text
  wchar_t *pwstr = text;

  int count = 0;

  while((pwstr < text + textlen - substrlen) && (pwstr = wcsstr(pwstr, substr))){
    ++count;
    pwstr += substrlen;
  }

  wprintf(L"The second string %ls found in the first%ls", count ? L"was" : L"was not", count ? L" " : L".\n");
  if(count)
     wprintf(L"%d times.\n",count);
  return 0;
}

// Convert a wide string to uppercase
wchar_t *wstr_towupper(wchar_t *wstr, size_t size){
  for(size_t i = 0 ; i < wcsnlen(wstr, size) ; ++i)
    wstr[i] = towupper(wstr[i]);
  return wstr;
}

Result


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