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; } 

Answer 2

#include <string.h>  char *strrev(char *str) {     if (!str || ! *str)         return str;      int i = strlen(str) - 1, j = 0;      char ch;     while (i > j)     {         ch = str[i];         str[i] = str[j];         str[j] = ch;         i--;         j++;     }     return str; }