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annotate examples/dsl/redirect.h @ 7:57b2cc9b87f7

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Use memcpy instead of strncpy when we know the length anyway. Modern gcc seems to think it knows how to detect misuse of strncpy, but it's wrong (in fact: very, very wrong) and the path of least resistance is to not try to fight with it.
author David A. Holland
date Mon, 30 May 2022 23:47:52 -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