gnu/usr.bin/fgrep/std.c

   1 /* std.c - compensate for a few missing library functions.
   2    In the Public Domain; written by Mike Haertel. */
   3
   4 #include "std.h"
   5 #include "unix.h"
   6
   7 #ifdef X_memmove
   8 PTR
   9 DEFUN(memmove, (d, s, n), PTR d AND PTRCONST s AND size_t n)
  10 {
  11   char *dd;
  12   const char *ss;
  13
  14   dd = d;
  15   ss = s;
  16   if (dd > ss && dd < ss + n)
  17     {
  18       dd += n;
  19       ss += n;
  20       while (n--)
  21         *--dd = *--ss;
  22     }
  23   else
  24     while (n--)
  25       *dd++ = *ss++;
  26   return d;
  27 }
  28 #endif /* X_memmove */
  29
  30 #ifdef X_remove
  31 #if defined(unix) || defined(__unix__)
  32 int
  33 DEFUN(remove, (filename), const char *filename)
  34 {
  35   extern int EXFUN(unlink, (const char *));
  36
  37   return unlink(filename);
  38 }
  39 #endif /* unix */
  40 #endif /* X_strerror */
  41
  42 #ifdef X_strerror
  43 #if defined(unix) || defined(__unix__)
  44 char *
  45 DEFUN(strerror, (errnum), int errnum)
  46 {
  47   extern int sys_nerr;
  48   extern char *sys_errlist[];
  49
  50   if (errnum > 0 && errnum < sys_nerr)
  51     return sys_errlist[errnum];
  52   return "";
  53 }
  54 #endif /* unix */
  55 #endif /* X_strerror */