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annotate lwar/extract.c @ 434:052c5f335a92

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Fix bug in like terms collection in expression simplification Like term collection would lose the actual "variable" part of the term if the second term collected happened to have no coefficient. This would cause the expression to take the value of the calculated coefficient which is obviously wrong. Thanks to hider <stego@satx.rr.com> for reporting the bug and providing a proper test case. Observation: this bug has been present since the first pre-release of lwtools 3.0 when the algebraic expression system was introduced. Apparently people tend not to create expressions that trigger the like terms handler. The specific conditions require the symbol to be undefined and the second operand to the addition has to have no coefficient so it's likely a fairly rare scenario. Still, it is somewhat surprising that nobody tripped on it before now.
author William Astle <lost@l-w.ca>
date Mon, 23 Jan 2017 22:58:36 -0700
parents 45df37e81741
children
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1 /*
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2 extract.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWAR.
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6
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7 LWAR is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 */
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21
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22 #include <errno.h>
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23 #include <stdio.h>
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24 #include <stdlib.h>
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25 #include <string.h>
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26
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27 #include "lwar.h"
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28
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29 void do_extract(void)
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30 {
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31 FILE *f;
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32 char buf[8];
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33 char *filename;
0
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34 long l;
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35 int c;
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36 char fnbuf[1024];
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37 int i;
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38 FILE *nf;
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39
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40 f = fopen(archive_file, "rb");
0
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41 if (!f)
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42 {
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43 perror("Opening archive file");
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44 exit(1);
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45 }
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46
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47 (void)(fread(buf, 1, 6, f) && 1);
0
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48 if (memcmp("LWAR1V", buf, 6))
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49 {
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50 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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51 exit(1);
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52 }
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53
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54 for (;;)
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55 {
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56 c = fgetc(f);
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57 if (ferror(f))
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58 {
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59 perror("Reading archive file");
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60 exit(1);
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61 }
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62 if (c == EOF)
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63 return;
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64
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65
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66 // find the end of the file name
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67 if (!c)
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68 return;
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69
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70 i = 0;
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71 while (c)
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72 {
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73 fnbuf[i++] = c;
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74 c = fgetc(f);
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75 if (c == EOF || ferror(f))
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76 {
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77 fprintf(stderr, "Bad archive file\n");
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78 exit(1);
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79 }
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80 }
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81 fnbuf[i] = 0;
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82 filename = get_file_name(fnbuf);
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83
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84 // get length of archive member
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85 l = 0;
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86 c = fgetc(f);
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87 l = c << 24;
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88 c = fgetc(f);
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89 l |= c << 16;
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90 c = fgetc(f);
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91 l |= c << 8;
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92 c = fgetc(f);
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93 l |= c;
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94
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95 for (i = 0; i < nfiles; i++)
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96 {
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97 if (!strcmp(get_file_name(files[i]), filename))
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98 break;
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99 }
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100 if (i < nfiles || nfiles == 0)
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101 {
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102 // extract the file
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103 nf = fopen(filename, "wb");
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104 if (!nf)
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105 {
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106 fprintf(stderr, "Cannot extract '%s': %s\n", filename, strerror(errno));
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107 exit(1);
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108 }
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109 while (l)
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110 {
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111 c = fgetc(f);
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112 fputc(c, nf);
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113 l--;
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114 }
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115 fclose(nf);
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116 }
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117 else
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118 {
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119 // skip the file
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120 fseek(f, l, SEEK_CUR);
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121 }
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122 }
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123 }