const void * memchr ( const void * ptr, int value, size_t num );
      void * memchr (       void * ptr, int value, size_t num );

<cstring>

Locate character in block of memory

Searches within the first num bytes of the block of memory pointed by ptr for the first occurrence of value (interpreted as an unsigned char), and returns a pointer to it.

Parameters

ptr

Pointer to the block of memory where the search is performed.

value

Value to be located. The value is passed as an int, but the function performs a byte per byte search using the unsigned char conversion of this value.

num

Number of bytes to be analyzed.

Return Value

Portability

void * memchr ( const void *, int, size_t );

instead of the two overloaded versions provided in C++.

Example

/* memchr example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char * pch;
  char str[] = "Example string";
  pch = (char*) memchr (str, 'p', strlen(str));
  if (pch!=NULL)
    printf ("'p' found at position %d.\n", pch-str+1);
  else
    printf ("'p' not found.\n");
  return 0;
}

Output:

'p' found at position 5.

See also