1 | /* |
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2 | * Copyright (c) 1990 The Regents of the University of California. |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms are permitted |
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6 | * provided that the above copyright notice and this paragraph are |
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7 | * duplicated in all such forms and that any documentation, |
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8 | * advertising materials, and other materials related to such |
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9 | * distribution and use acknowledge that the software was developed |
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10 | * by the University of California, Berkeley. The name of the |
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11 | * University may not be used to endorse or promote products derived |
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12 | * from this software without specific prior written permission. |
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13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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16 | */ |
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17 | |
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18 | /* |
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19 | FUNCTION |
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20 | <<putc>>---write a character (macro) |
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21 | |
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22 | INDEX |
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23 | putc |
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24 | INDEX |
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25 | _putc_r |
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26 | |
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27 | SYNOPSIS |
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28 | #include <stdio.h> |
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29 | int putc(int <[ch]>, FILE *<[fp]>); |
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30 | |
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31 | #include <stdio.h> |
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32 | int _putc_r(struct _reent *<[ptr]>, int <[ch]>, FILE *<[fp]>); |
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33 | |
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34 | DESCRIPTION |
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35 | <<putc>> is a macro, defined in <<stdio.h>>. <<putc>> |
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36 | writes the argument <[ch]> to the file or stream identified by |
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37 | <[fp]>, after converting it from an <<int>> to an <<unsigned char>>. |
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38 | |
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39 | If the file was opened with append mode (or if the stream cannot |
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40 | support positioning), then the new character goes at the end of the |
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41 | file or stream. Otherwise, the new character is written at the |
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42 | current value of the position indicator, and the position indicator |
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43 | advances by one. |
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44 | |
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45 | For a subroutine version of this macro, see <<fputc>>. |
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46 | |
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47 | The <<_putc_r>> function is simply the reentrant version of |
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48 | <<putc>> that takes an additional reentrant structure argument: <[ptr]>. |
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49 | |
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50 | RETURNS |
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51 | If successful, <<putc>> returns its argument <[ch]>. If an error |
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52 | intervenes, the result is <<EOF>>. You can use `<<ferror(<[fp]>)>>' to |
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53 | query for errors. |
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54 | |
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55 | PORTABILITY |
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56 | ANSI C requires <<putc>>; it suggests, but does not require, that |
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57 | <<putc>> be implemented as a macro. The standard explicitly permits |
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58 | macro implementations of <<putc>> to use the <[fp]> argument more than once; |
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59 | therefore, in a portable program, you should not use an expression |
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60 | with side effects as this argument. |
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61 | |
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62 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
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63 | <<lseek>>, <<read>>, <<sbrk>>, <<write>>. |
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64 | */ |
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65 | |
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66 | #if defined(LIBC_SCCS) && !defined(lint) |
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67 | static char sccsid[] = "%W% (Berkeley) %G%"; |
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68 | #endif /* LIBC_SCCS and not lint */ |
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69 | |
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70 | #include <_ansi.h> |
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71 | #include <stdio.h> |
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72 | #include "local.h" |
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73 | |
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74 | /* |
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75 | * A subroutine version of the macro putc. |
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76 | */ |
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77 | |
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78 | #undef putc |
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79 | |
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80 | int |
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81 | _putc_r (struct _reent *ptr, |
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82 | int c, |
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83 | register FILE *fp) |
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84 | { |
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85 | int result; |
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86 | CHECK_INIT (ptr, fp); |
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87 | _newlib_flockfile_start (fp); |
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88 | result = __sputc_r (ptr, c, fp); |
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89 | _newlib_flockfile_end (fp); |
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90 | return result; |
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91 | } |
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92 | |
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93 | #ifndef _REENT_ONLY |
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94 | int |
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95 | putc (int c, |
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96 | register FILE *fp) |
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97 | { |
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98 | #if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__) |
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99 | int result; |
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100 | struct _reent *reent = _REENT; |
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101 | |
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102 | CHECK_INIT (reent, fp); |
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103 | _newlib_flockfile_start (fp); |
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104 | result = __sputc_r (reent, c, fp); |
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105 | _newlib_flockfile_end (fp); |
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106 | return result; |
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107 | #else |
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108 | return _putc_r (_REENT, c, fp); |
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109 | #endif |
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110 | } |
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111 | #endif /* !_REENT_ONLY */ |
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112 | |
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