release/src/router/busybox/libbb/skip_whitespace.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * skip_whitespace implementation for busybox
   4  *
   5  * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9
  10 #include "libbb.h"
  11
  12 char* FAST_FUNC skip_whitespace(const char *s)
  13 {
  14         /* In POSIX/C locale (the only locale we care about: do we REALLY want
  15          * to allow Unicode whitespace in, say, .conf files? nuts!)
  16          * isspace is only these chars: "\t\n\v\f\r" and space.
  17          * "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
  18          * Use that.
  19          */
  20         while (*s == ' ' || (unsigned char)(*s - 9) <= (13 - 9))
  21                 s++;
  22
  23         return (char *) s;
  24 }
  25
  26 char* FAST_FUNC skip_non_whitespace(const char *s)
  27 {
  28         while (*s != '\0' && *s != ' ' && (unsigned char)(*s - 9) > (13 - 9))
  29                 s++;
  30
  31         return (char *) s;
  32 }
  33
  34 char* FAST_FUNC skip_dev_pfx(const char *tty_name)
  35 {
  36         if (is_prefixed_with(tty_name, "/dev/"))
  37                 tty_name += 5;
  38         return (char*)tty_name;
  39 }