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30
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1 /*-
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2 * Copyright (c) 2010 The NetBSD Foundation, Inc.
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3 * All rights reserved.
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4 *
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5 * This code is derived from software contributed to The NetBSD Foundation
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6 * by David A. Holland.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 * 1. Redistributions of source code must retain the above copyright
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12 * notice, this list of conditions and the following disclaimer.
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13 * 2. Redistributions in binary form must reproduce the above copyright
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14 * notice, this list of conditions and the following disclaimer in the
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15 * documentation and/or other materials provided with the distribution.
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16 *
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17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 * POSSIBILITY OF SUCH DAMAGE.
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28 */
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29
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6
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30 #include <stdbool.h>
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31 #include <stdio.h>
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32 #include <stdlib.h>
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13
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33 #include <string.h>
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6
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34 #include <unistd.h>
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35 #include <fcntl.h>
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36 #include <err.h>
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37
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38 #include "array.h"
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15
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39 #include "mode.h"
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8
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40 #include "place.h"
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6
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41 #include "files.h"
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15
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42 #include "directive.h"
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6
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43
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44 struct incdir {
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45 const char *name;
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46 bool issystem;
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47 };
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48
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49 DECLARRAY(incdir);
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50 DEFARRAY(incdir, );
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51
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52 static struct incdirarray quotepath, bracketpath;
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53
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54 ////////////////////////////////////////////////////////////
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55 // management
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56
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57 static
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58 struct incdir *
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59 incdir_create(const char *name, bool issystem)
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60 {
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61 struct incdir *id;
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62
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63 id = domalloc(sizeof(*id));
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64 id->name = name;
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65 id->issystem = issystem;
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66 return id;
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67 }
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68
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69 static
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70 void
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71 incdir_destroy(struct incdir *id)
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72 {
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73 free(id);
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74 }
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75
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76 void
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77 files_init(void)
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78 {
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79 incdirarray_init("epath);
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80 incdirarray_init(&bracketpath);
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81 }
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82
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9
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83 DESTROYALL_ARRAY(incdir, );
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6
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84
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85 void
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86 files_cleanup(void)
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87 {
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88 incdirarray_destroyall("epath);
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89 incdirarray_cleanup("epath);
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90 incdirarray_destroyall(&bracketpath);
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91 incdirarray_cleanup(&bracketpath);
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92 }
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93
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94 ////////////////////////////////////////////////////////////
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95 // path setup
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96
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97 void
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98 files_addquotepath(const char *dir, bool issystem)
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99 {
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100 struct incdir *id;
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101
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102 id = incdir_create(dir, issystem);
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103 incdirarray_add("epath, id, NULL);
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104 }
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105
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106 void
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107 files_addbracketpath(const char *dir, bool issystem)
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108 {
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109 struct incdir *id;
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110
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111 id = incdir_create(dir, issystem);
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112 incdirarray_add(&bracketpath, id, NULL);
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113 }
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114
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115 ////////////////////////////////////////////////////////////
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116 // parsing
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117
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15
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118 static
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119 size_t
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120 findnl(const char *buf, size_t start, size_t limit)
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121 {
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122 size_t i;
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123
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124 for (i=start; i<limit; i++) {
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125 if (buf[i] == '\n') {
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126 return i;
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127 }
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128 }
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129 return limit;
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130 }
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131
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132 static
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6
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133 void
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28
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134 file_read(const struct placefile *pf, int fd, const char *name, bool toplevel)
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15
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135 {
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136 struct place linestartplace, nextlinestartplace, ptmp;
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137 size_t bufend, bufmax, linestart, lineend, nextlinestart, tmp;
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138 ssize_t result;
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139 bool ateof = false;
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140 char *buf;
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141
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142 place_setfilestart(&linestartplace, pf);
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143 nextlinestartplace = linestartplace;
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144
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145 bufmax = 128;
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146 bufend = 0;
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147 linestart = 0;
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148 lineend = 0;
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149 buf = domalloc(bufmax);
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150
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151 while (1) {
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152 if (lineend >= bufend) {
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153 /* do not have a whole line in the buffer; read more */
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154 if (linestart > 0 && bufend > linestart) {
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155 /* slide to beginning of buffer */
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156 memmove(buf, buf+linestart, bufend-linestart);
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157 bufend -= linestart;
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158 lineend -= linestart;
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159 linestart = 0;
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160 }
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161 if (bufend >= bufmax) {
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162 /* need bigger buffer */
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163 bufmax *= 2;
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164 buf = dorealloc(buf, bufmax);
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165 }
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166
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167 if (ateof) {
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168 /* don't read again, in case it's a socket */
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169 result = 0;
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170 } else {
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171 result = read(fd, buf+bufend, bufmax - bufend);
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172 }
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173
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174 if (result == -1) {
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175 /* read error */
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176 warn("%s", name);
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177 complain_fail();
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178 } else if (result == 0 && bufend == linestart) {
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179 /* eof */
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180 ateof = true;
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181 break;
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182 } else if (result == 0) {
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183 /* eof in middle of line */
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184 ateof = true;
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185 ptmp = linestartplace;
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186 ptmp.column += bufend - linestart;
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187 complain(&ptmp, "No newline at end of file");
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188 if (mode.werror) {
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189 complain_fail();
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190 }
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191 assert(bufend < bufmax);
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192 lineend = bufend++;
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193 buf[lineend] = '\n';
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194 } else {
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195 tmp = bufend;
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196 bufend += (size_t)result;
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197 lineend = findnl(buf, tmp, bufend);
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198 }
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199 /* loop in case we still don't have a whole line */
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200 continue;
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201 }
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202
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203 /* have a line */
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204 assert(buf[lineend] == '\n');
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205 buf[lineend] = '\0';
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206 nextlinestart = lineend+1;
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207 nextlinestartplace.line++;
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208
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209 /* check for CR/NL */
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210 if (lineend > 0 && buf[lineend-1] == '\r') {
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211 buf[lineend-1] = '\0';
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212 lineend--;
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213 }
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214
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215 /* check for continuation line */
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216 if (lineend > 0 && buf[lineend-1]=='\\') {
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217 lineend--;
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218 tmp = nextlinestart - lineend;
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219 if (bufend > nextlinestart) {
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220 memmove(buf+lineend, buf+nextlinestart,
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221 bufend - nextlinestart);
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222 }
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223 bufend -= tmp;
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224 nextlinestart -= tmp;
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225 lineend = findnl(buf, lineend, bufend);
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226 /* might not have a whole line, so loop */
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227 continue;
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228 }
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229
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230 /* line now goes from linestart to lineend */
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231 assert(buf[lineend] == '\0');
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232 if (lineend > linestart) {
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233 directive_gotline(&linestartplace,
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234 buf+linestart, lineend-linestart);
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235 }
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236
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237 linestart = nextlinestart;
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238 lineend = findnl(buf, linestart, bufend);
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239 linestartplace = nextlinestartplace;
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240 }
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241
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28
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242 if (toplevel) {
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243 directive_goteof(&linestartplace);
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244 }
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15
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245 free(buf);
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246 }
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6
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247
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248 ////////////////////////////////////////////////////////////
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249 // path search
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250
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251 static
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13
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252 char *
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253 mkfilename(const char *dir, const char *file)
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254 {
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255 size_t dlen, flen, rlen;
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256 char *ret;
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257 bool needslash = false;
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258
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259 dlen = strlen(dir);
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260 flen = strlen(file);
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261 if (dlen > 0 && dir[dlen-1] != '/') {
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262 needslash = true;
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263 }
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264
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265 rlen = dlen + (needslash ? 1 : 0) + flen;
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266 ret = domalloc(rlen + 1);
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267 strcpy(ret, dir);
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268 if (needslash) {
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269 strcat(ret, "/");
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270 }
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271 strcat(ret, file);
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272 return ret;
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273 }
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274
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275 static
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6
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276 int
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277 file_tryopen(const char *file)
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278 {
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279 int fd;
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280
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15
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281 /* XXX check for non-regular files */
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282
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6
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283 fd = open(file, O_RDONLY);
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284 if (fd < 0) {
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285 return -1;
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286 }
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15
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287
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6
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288 return fd;
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289 }
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290
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291 static
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292 void
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293 file_search(struct place *place, struct incdirarray *path, const char *name)
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294 {
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295 unsigned i, num;
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296 struct incdir *id;
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13
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297 const struct placefile *pf;
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6
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298 char *file;
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299 int fd;
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300
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301 assert(place != NULL);
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302
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303 num = incdirarray_num(path);
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304 for (i=0; i<num; i++) {
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305 id = incdirarray_get(path, i);
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13
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306 file = mkfilename(id->name, name);
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6
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307 fd = file_tryopen(file);
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308 if (fd >= 0) {
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13
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309 pf = place_addfile(place, file, id->issystem);
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28
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310 file_read(pf, fd, file, false);
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13
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311 free(file);
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6
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312 close(fd);
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313 return;
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314 }
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315 free(file);
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316 }
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317 complain(place, "Include file %s not found", name);
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318 complain_fail();
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319 }
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320
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321 void
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322 file_readquote(struct place *place, const char *name)
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323 {
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324 file_search(place, "epath, name);
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325 }
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326
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327 void
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328 file_readbracket(struct place *place, const char *name)
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329 {
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330 file_search(place, &bracketpath, name);
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331 }
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332
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333 void
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334 file_readabsolute(struct place *place, const char *name)
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335 {
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13
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336 const struct placefile *pf;
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6
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337 int fd;
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338
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339 assert(place != NULL);
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340
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24
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341 if (name == NULL) {
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342 fd = STDIN_FILENO;
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343 pf = place_addfile(place, "<standard-input>", false);
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344 } else {
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345 fd = file_tryopen(name);
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346 if (fd < 0) {
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347 warn("%s", name);
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348 die();
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349 }
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350 pf = place_addfile(place, name, false);
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6
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351 }
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24
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352
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28
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353 file_read(pf, fd, name, true);
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24
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354
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355 if (name != NULL) {
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356 close(fd);
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357 }
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6
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358 }
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