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  1. /*
  2.  * Copyright (c) 1990 The Regents of the University of California.
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms are permitted
  6.  * provided that the above copyright notice and this paragraph are
  7.  * duplicated in all such forms and that any documentation,
  8.  * advertising materials, and other materials related to such
  9.  * distribution and use acknowledge that the software was developed
  10.  * by the University of California, Berkeley.  The name of the
  11.  * University may not be used to endorse or promote products derived
  12.  * from this software without specific prior written permission.
  13.  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  14.  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  15.  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  16.  */
  17.  
  18. /*
  19. FUNCTION
  20. <<fgetc>>---get a character from a file or stream
  21.  
  22. INDEX
  23.         fgetc
  24. INDEX
  25.         _fgetc_r
  26.  
  27. ANSI_SYNOPSIS
  28.         #include <stdio.h>
  29.         int fgetc(FILE *<[fp]>);
  30.  
  31.         #include <stdio.h>
  32.         int _fgetc_r(struct _reent *<[ptr]>, FILE *<[fp]>);
  33.  
  34. TRAD_SYNOPSIS
  35.         #include <stdio.h>
  36.         int fgetc(<[fp]>)
  37.         FILE *<[fp]>;
  38.  
  39.         #include <stdio.h>
  40.         int _fgetc_r(<[ptr]>, <[fp]>)
  41.         struct _reent *<[ptr]>;
  42.         FILE *<[fp]>;
  43.  
  44. DESCRIPTION
  45. Use <<fgetc>> to get the next single character from the file or stream
  46. identified by <[fp]>.  As a side effect, <<fgetc>> advances the file's
  47. current position indicator.
  48.  
  49. For a macro version of this function, see <<getc>>.
  50.  
  51. The function <<_fgetc_r>> is simply a reentrant version of
  52. <<fgetc>> that is passed the additional reentrant structure
  53. pointer argument: <[ptr]>.
  54.  
  55. RETURNS
  56. The next character (read as an <<unsigned char>>, and cast to
  57. <<int>>), unless there is no more data, or the host system reports a
  58. read error; in either of these situations, <<fgetc>> returns <<EOF>>.
  59.  
  60. You can distinguish the two situations that cause an <<EOF>> result by
  61. using the <<ferror>> and <<feof>> functions.
  62.  
  63. PORTABILITY
  64. ANSI C requires <<fgetc>>.
  65.  
  66. Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
  67. <<lseek>>, <<read>>, <<sbrk>>, <<write>>.
  68. */
  69.  
  70. #include <_ansi.h>
  71. #include <stdio.h>
  72. #include "local.h"
  73.  
  74. int
  75. _DEFUN(_fgetc_r, (ptr, fp),
  76.        struct _reent * ptr _AND
  77.        FILE * fp)
  78. {
  79.   int result;
  80.   CHECK_INIT(ptr, fp);
  81.   _newlib_flockfile_start (fp);
  82.   result = __sgetc_r (ptr, fp);
  83.   _newlib_flockfile_end (fp);
  84.   return result;
  85. }
  86.  
  87. #ifndef _REENT_ONLY
  88.  
  89. int
  90. _DEFUN(fgetc, (fp),
  91.        FILE * fp)
  92. {
  93. #if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__)
  94.   int result;
  95.   struct _reent *reent = _REENT;
  96.  
  97.   CHECK_INIT(reent, fp);
  98.   _newlib_flockfile_start (fp);
  99.   result = __sgetc_r (reent, fp);
  100.   _newlib_flockfile_end (fp);
  101.   return result;
  102. #else
  103.   return _fgetc_r (_REENT, fp);
  104. #endif
  105. }
  106.  
  107. #endif /* !_REENT_ONLY */
  108.  
  109.