l4/pkg/uclibc/lib/contrib/uclibc/libc/stdio/fputc.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 #undef fputc
  11 #undef fputc_unlocked
  12 #undef putc
  13 #undef putc_unlocked
  14
  15
  16 #ifdef __DO_UNLOCKED
  17
  18 int __fputc_unlocked(int c, register FILE *stream)
  19 {
  20         __STDIO_STREAM_VALIDATE(stream);
  21
  22         /* First the fast path.  We're good to go if putc macro enabled. */
  23         if (__STDIO_STREAM_CAN_USE_BUFFER_ADD(stream)) {
  24                 __STDIO_STREAM_BUFFER_ADD(stream, ((unsigned char) c));
  25                 return (unsigned char) c;
  26         }
  27
  28         /* Next quickest... writing and narrow oriented, but macro
  29          * disabled and/or buffer is full. */
  30         if (__STDIO_STREAM_IS_NARROW_WRITING(stream)
  31                 || !__STDIO_STREAM_TRANS_TO_WRITE(stream, __FLAG_NARROW)
  32                 ) {
  33                 if (__STDIO_STREAM_IS_FAKE_VSNPRINTF(stream)) {
  34                         return (unsigned char) c;
  35                 }
  36
  37                 if (__STDIO_STREAM_BUFFER_SIZE(stream)) { /* Do we have a buffer? */
  38                         /* The buffer is full and/or the stream is line buffered. */
  39                         if (!__STDIO_STREAM_BUFFER_WAVAIL(stream) /* Buffer full? */
  40                                 && __STDIO_COMMIT_WRITE_BUFFER(stream) /* Commit failed! */
  41                                 ) {
  42                                 goto BAD;
  43                         }
  44 #ifdef __UCLIBC_MJN3_ONLY__
  45 #warning CONSIDER: Should we fail if the commit fails but we now have room?
  46 #endif
  47
  48                         __STDIO_STREAM_BUFFER_ADD(stream, ((unsigned char) c));
  49
  50                         if (__STDIO_STREAM_IS_LBF(stream)) {
  51                                 if ((((unsigned char) c) == '\n')
  52                                         && __STDIO_COMMIT_WRITE_BUFFER(stream)) {
  53                                         /* Commit failed! */
  54                                         __STDIO_STREAM_BUFFER_UNADD(stream); /* Undo the write! */
  55                                         goto BAD;
  56                                 }
  57                         }
  58                 } else {
  59                         /* NOTE: Do not try to save space by moving uc to the top of
  60                          * the file, as that dramaticly increases runtime. */
  61                         unsigned char uc = (unsigned char) c;
  62                         if (! __stdio_WRITE(stream, &uc, 1)) {
  63                                 goto BAD;
  64                         }
  65                 }
  66                 return (unsigned char) c;
  67         }
  68
  69  BAD:
  70         return EOF;
  71 }
  72 libc_hidden_def(__fputc_unlocked)
  73
  74 strong_alias(__fputc_unlocked,fputc_unlocked)
  75
  76 strong_alias(__fputc_unlocked,putc_unlocked)
  77 #ifndef __UCLIBC_HAS_THREADS__
  78 strong_alias(__fputc_unlocked,fputc)
  79 libc_hidden_def(fputc)
  80
  81 strong_alias(__fputc_unlocked,putc)
  82 #endif
  83
  84 #elif defined __UCLIBC_HAS_THREADS__
  85
  86 int fputc(int c, register FILE *stream)
  87 {
  88         if (stream->__user_locking != 0) {
  89                 return __PUTC_UNLOCKED_MACRO(c, stream);
  90         } else {
  91                 int retval;
  92                 __STDIO_ALWAYS_THREADLOCK(stream);
  93                 retval = __PUTC_UNLOCKED_MACRO(c, stream);
  94                 __STDIO_ALWAYS_THREADUNLOCK(stream);
  95                 return retval;
  96         }
  97 }
  98 libc_hidden_def(fputc)
  99
 100 strong_alias(fputc,putc)
 101
 102 #endif