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annotate examples/dsl/redirect.h @ 21:1c9dac05d040

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Add lint-style FALLTHROUGH annotations to fallthrough cases. (in the parse engine and thus the output code) Document this, because the old output causes warnings with gcc10.
author David A. Holland
date Mon, 13 Jun 2022 00:04:38 -0400
parents 607e3be6bad8
children
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1 /*****
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2
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3 AnaGram Programming Examples
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4
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5 A Dos Script Language
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6 Redirection Class Definition
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7
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8 Copyright 1993 Parsifal Software. All Rights Reserved.
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9
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10 This software is provided 'as-is', without any express or implied
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11 warranty. In no event will the authors be held liable for any damages
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12 arising from the use of this software.
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13
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14 Permission is granted to anyone to use this software for any purpose,
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15 including commercial applications, and to alter it and redistribute it
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16 freely, subject to the following restrictions:
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17
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18 1. The origin of this software must not be misrepresented; you must not
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19 claim that you wrote the original software. If you use this software
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20 in a product, an acknowledgment in the product documentation would be
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21 appreciated but is not required.
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22 2. Altered source versions must be plainly marked as such, and must not be
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23 misrepresented as being the original software.
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24 3. This notice may not be removed or altered from any source distribution.
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25
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26 *****/
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27
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28 #ifndef REDIRECT_H
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29 #define REDIRECT_H
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30 #include <sys/types.h>
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31 #include <sys/stat.h>
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32 #include <stdio.h>
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33 #include <string.h>
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34 #include <fcntl.h>
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35
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36 #if defined(__MSDOS__) || defined(__WINDOWS__)
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37 #include <io.h>
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38 #else
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39 #include <unistd.h>
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40 #include <stdlib.h>
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41 #define O_TEXT 0
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42 #define O_BINARY 0
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43 #define tell(fd) lseek(fd, 0, SEEK_CUR)
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44 /* This is only meant to compile, not run. (Unix) */
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45 #define filelength(fd) ((void)(fd), 0)
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46 #endif
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47
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48 #define STDIN 0
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49 #define STDOUT 1
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50 #define STDERR 2
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51
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52 class redirect {
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53 int handle; // actual handle
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54 int old_handle; // old handle
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55 char name[L_tmpnam]; // temporary name, if any
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56 int copy_flag; // is it live or is it memorex?
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57 public:
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58
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59 // Constructors
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60 redirect(int h);
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61 redirect(int h, char *file_name, int append_flag = 0);
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62 redirect(const redirect &);
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63 void operator = (const redirect &);
0
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64
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65 // Reset
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66 friend redirect &reset(redirect &e) {
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67 lseek(e.handle,0,0);
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68 return e;
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69 }
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70
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71 // Destructor
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72 ~redirect();
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73
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74 // Save resultant file
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75 friend char *save_file(redirect &s);
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76
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77 // Extract contents
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78 friend char *content(redirect &s);
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79 };
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80
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81 #endif