com32/lib/strerror.c

   1 /*
   2  * strerror.c
   3  */
   4
   5 #include <string.h>
   6
   7 char *strerror(int errnum)
   8 {
   9         static char message[32] = "error ";     /* enough for error 2^63-1 */
  10         char numbuf[32];
  11         char *p;
  12         unsigned int e = (unsigned int)errnum;
  13
  14         extern const int sys_nerr;
  15         extern const char *const sys_errlist[];
  16
  17         if (e < (unsigned int)sys_nerr && sys_errlist[e])
  18                 return (char *)sys_errlist[e];
  19
  20         p = numbuf + sizeof numbuf;
  21         *--p = '\0';
  22
  23         do {
  24                 *--p = (e % 10) + '0';
  25                 e /= 10;
  26         } while (e);
  27
  28         memcpy(message + 6, p, (numbuf + sizeof numbuf) - p);
  29
  30         return message;
  31 }