c - Is the strrev() function not available in Linux?

Question

I tried to write code using strrev(). I included <string.h> but still I'm getting an "undefined reference to strrev" error.

I found that strrev() doesn't have man page at all. Why?

Doesn't Linux support strrev()?

Answer 1

Correct. Use one of the alternative implementations available:

#include <string.h>

char *strrev(char *str)
{
      char *p1, *p2;

      if (! str || ! *str)
            return str;
      for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
      {
            *p1 ^= *p2;
            *p2 ^= *p1;
            *p1 ^= *p2;
      }
      return str;
}