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   strerror

   Usage
   #include <string.h>
   char *strerror(int errornum);

   Description
   This function is NOT part of String_package.
   Maps errornum to an error message string and returns a pointer to that
   string.

   Example
   #include <stdio.h>
   #include <errno.h>
   #include <io.h>
   #include <dos.h>
   #include <string.h>

   main()
   {
   int fp;

        errno = 0;
        if((fp = open("file",O_RDONLY)) == -1)
        {
             printf(strerror(errno));
        }
        close(fp);
   }

   Return Value
   strerror returns a pointer to the error message string.