libc/stdio/gets.c

   1 /* Copyright (C) 2004       Manuel Novoa III    <mjn3@codepoet.org>
   2  *
   3  * GNU Library General Public License (LGPL) version 2 or later.
   4  *
   5  * Dedicated to Toni.  See uClibc/DEDICATION.mjn3 for details.
   6  */
   7
   8 #include "_stdio.h"
   9
  10 /* UNSAFE FUNCTION -- do not bother optimizing */
  11
  12 /* disable macro, force actual function call */
  13 #undef getchar_unlocked
  14
  15 char *gets(char *s)
  16 {
  17         register char *p = s;
  18         int c;
  19         __STDIO_AUTO_THREADLOCK_VAR;
  20
  21         __STDIO_AUTO_THREADLOCK(stdin);
  22
  23         /* Note: don't worry about performance here... this shouldn't be used!
  24          * Therefore, force actual function call. */
  25         while (((c = getchar_unlocked()) != EOF) && ((*p = c) != '\n')) {
  26                 ++p;
  27         }
  28         if ((c == EOF) || (s == p)) {
  29                 s = NULL;
  30         } else {
  31                 *p = 0;
  32         }
  33
  34         __STDIO_AUTO_THREADUNLOCK(stdin);
  35
  36         return s;
  37 }