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2714 | cejka | 1 | /* $NetBSD: cd.c,v 1.27 1999/07/09 03:05:49 christos Exp $ */ |
2 | |||
3 | /*- |
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4 | * Copyright (c) 1991, 1993 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * This code is derived from software contributed to Berkeley by |
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8 | * Kenneth Almquist. |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without |
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11 | * modification, are permitted provided that the following conditions |
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12 | * are met: |
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13 | * 1. Redistributions of source code must retain the above copyright |
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14 | * notice, this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright |
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16 | * notice, this list of conditions and the following disclaimer in the |
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17 | * documentation and/or other materials provided with the distribution. |
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18 | * 3. All advertising materials mentioning features or use of this software |
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19 | * must display the following acknowledgement: |
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20 | * This product includes software developed by the University of |
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21 | * California, Berkeley and its contributors. |
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22 | * 4. Neither the name of the University nor the names of its contributors |
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23 | * may be used to endorse or promote products derived from this software |
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24 | * without specific prior written permission. |
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25 | * |
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26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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36 | * SUCH DAMAGE. |
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37 | */ |
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38 | |||
39 | #include <sys/cdefs.h> |
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40 | #ifndef lint |
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41 | #if 0 |
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42 | static char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95"; |
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43 | #else |
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44 | __RCSID("$NetBSD: cd.c,v 1.27 1999/07/09 03:05:49 christos Exp $"); |
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45 | #endif |
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46 | #endif /* not lint */ |
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47 | |||
48 | #include <sys/types.h> |
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49 | #include <sys/stat.h> |
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50 | #include <stdlib.h> |
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51 | #include <string.h> |
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52 | #include <unistd.h> |
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53 | #include <errno.h> |
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54 | |||
55 | /* |
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56 | * The cd and pwd commands. |
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57 | */ |
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58 | |||
59 | #include "shell.h" |
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60 | #include "var.h" |
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61 | #include "nodes.h" /* for jobs.h */ |
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62 | #include "jobs.h" |
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63 | #include "options.h" |
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64 | #include "output.h" |
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65 | #include "memalloc.h" |
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66 | #include "error.h" |
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67 | #include "exec.h" |
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68 | #include "redir.h" |
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69 | #include "mystring.h" |
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70 | #include "show.h" |
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71 | #include "cd.h" |
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72 | |||
73 | STATIC int docd (char *, int); |
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74 | STATIC char *getcomponent (void); |
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75 | STATIC void updatepwd (char *); |
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76 | |||
77 | char *curdir = NULL; /* current working directory */ |
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78 | char *prevdir; /* previous working directory */ |
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79 | STATIC char *cdcomppath; |
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80 | |||
81 | int |
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82 | cdcmd(argc, argv) |
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83 | int argc; |
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84 | char **argv; |
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85 | { |
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86 | const char *dest; |
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87 | const char *path; |
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88 | char *p; |
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89 | struct stat statb; |
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90 | int print = 0; |
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91 | |||
92 | nextopt(nullstr); |
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93 | if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL) |
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94 | error("HOME not set"); |
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95 | if (*dest == '\0') |
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96 | dest = "."; |
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97 | if (dest[0] == '-' && dest[1] == '\0') { |
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98 | dest = prevdir ? prevdir : curdir; |
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99 | print = 1; |
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100 | if (dest) |
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101 | print = 1; |
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102 | else |
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103 | dest = "."; |
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104 | } |
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105 | if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL) |
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106 | path = nullstr; |
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107 | while ((p = padvance(&path, dest)) != NULL) { |
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108 | if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { |
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109 | if (!print) { |
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110 | /* |
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111 | * XXX - rethink |
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112 | */ |
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113 | if (p[0] == '.' && p[1] == '/' && p[2] != '\0') |
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114 | p += 2; |
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115 | print = strcmp(p, dest); |
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116 | } |
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117 | if (docd(p, print) >= 0) |
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118 | return 0; |
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119 | |||
120 | } |
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121 | } |
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122 | error("can't cd to %s", dest); |
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123 | /* NOTREACHED */ |
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124 | } |
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125 | |||
126 | |||
127 | /* |
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128 | * Actually do the chdir. In an interactive shell, print the |
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129 | * directory name if "print" is nonzero. |
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130 | */ |
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131 | |||
132 | STATIC int |
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133 | docd(dest, print) |
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134 | char *dest; |
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135 | int print; |
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136 | { |
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137 | char *p; |
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138 | char *q; |
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139 | char *component; |
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140 | struct stat statb; |
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141 | int first; |
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142 | int badstat; |
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143 | |||
144 | TRACE(("docd(\"%s\", %d) called\n", dest, print)); |
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145 | |||
146 | /* |
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147 | * Check each component of the path. If we find a symlink or |
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148 | * something we can't stat, clear curdir to force a getcwd() |
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149 | * next time we get the value of the current directory. |
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150 | */ |
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151 | badstat = 0; |
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152 | cdcomppath = stalloc(strlen(dest) + 1); |
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153 | scopy(dest, cdcomppath); |
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154 | STARTSTACKSTR(p); |
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155 | if (*dest == '/') { |
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156 | STPUTC('/', p); |
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157 | cdcomppath++; |
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158 | } |
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159 | first = 1; |
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160 | while ((q = getcomponent()) != NULL) { |
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161 | if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0')) |
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162 | continue; |
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163 | if (! first) |
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164 | STPUTC('/', p); |
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165 | first = 0; |
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166 | component = q; |
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167 | while (*q) |
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168 | STPUTC(*q++, p); |
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169 | if (equal(component, "..")) |
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170 | continue; |
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171 | STACKSTRNUL(p); |
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172 | if ((lstat(stackblock(), &statb) < 0) |
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173 | || (S_ISLNK(statb.st_mode))) { |
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174 | /* print = 1; */ |
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175 | badstat = 1; |
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176 | break; |
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177 | } |
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178 | } |
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179 | |||
180 | INTOFF; |
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181 | if (chdir(dest) < 0) { |
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182 | INTON; |
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183 | return -1; |
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184 | } |
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185 | updatepwd(badstat ? NULL : dest); |
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186 | INTON; |
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187 | if (print && iflag && curdir) |
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188 | out1fmt("%s\n", curdir); |
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189 | return 0; |
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190 | } |
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191 | |||
192 | |||
193 | /* |
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194 | * Get the next component of the path name pointed to by cdcomppath. |
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195 | * This routine overwrites the string pointed to by cdcomppath. |
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196 | */ |
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197 | |||
198 | STATIC char * |
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199 | getcomponent() { |
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200 | char *p; |
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201 | char *start; |
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202 | |||
203 | if ((p = cdcomppath) == NULL) |
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204 | return NULL; |
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205 | start = cdcomppath; |
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206 | while (*p != '/' && *p != '\0') |
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207 | p++; |
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208 | if (*p == '\0') { |
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209 | cdcomppath = NULL; |
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210 | } else { |
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211 | *p++ = '\0'; |
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212 | cdcomppath = p; |
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213 | } |
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214 | return start; |
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215 | } |
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216 | |||
217 | |||
218 | |||
219 | /* |
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220 | * Update curdir (the name of the current directory) in response to a |
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221 | * cd command. We also call hashcd to let the routines in exec.c know |
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222 | * that the current directory has changed. |
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223 | */ |
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224 | |||
225 | STATIC void |
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226 | updatepwd(dir) |
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227 | char *dir; |
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228 | { |
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229 | char *new; |
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230 | char *p; |
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231 | |||
232 | hashcd(); /* update command hash table */ |
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233 | |||
234 | /* |
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235 | * If our argument is NULL, we don't know the current directory |
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236 | * any more because we traversed a symbolic link or something |
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237 | * we couldn't stat(). |
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238 | */ |
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239 | if (dir == NULL || curdir == NULL) { |
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240 | if (prevdir) |
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241 | ckfree(prevdir); |
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242 | INTOFF; |
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243 | prevdir = curdir; |
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244 | curdir = NULL; |
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245 | getpwd(); |
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246 | setvar("PWD", curdir, VEXPORT|VTEXTFIXED); |
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247 | setvar("OLDPWD", prevdir, VEXPORT|VTEXTFIXED); |
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248 | INTON; |
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249 | return; |
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250 | } |
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251 | cdcomppath = stalloc(strlen(dir) + 1); |
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252 | scopy(dir, cdcomppath); |
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253 | STARTSTACKSTR(new); |
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254 | if (*dir != '/') { |
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255 | p = curdir; |
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256 | while (*p) |
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257 | STPUTC(*p++, new); |
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258 | if (p[-1] == '/') |
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259 | STUNPUTC(new); |
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260 | } |
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261 | while ((p = getcomponent()) != NULL) { |
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262 | if (equal(p, "..")) { |
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263 | while (new > stackblock() && (STUNPUTC(new), *new) != '/'); |
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264 | } else if (*p != '\0' && ! equal(p, ".")) { |
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265 | STPUTC('/', new); |
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266 | while (*p) |
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267 | STPUTC(*p++, new); |
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268 | } |
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269 | } |
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270 | if (new == stackblock()) |
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271 | STPUTC('/', new); |
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272 | STACKSTRNUL(new); |
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273 | INTOFF; |
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274 | if (prevdir) |
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275 | ckfree(prevdir); |
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276 | prevdir = curdir; |
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277 | curdir = savestr(stackblock()); |
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278 | setvar("PWD", curdir, VEXPORT|VTEXTFIXED); |
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279 | setvar("OLDPWD", prevdir, VEXPORT|VTEXTFIXED); |
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280 | INTON; |
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281 | } |
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282 | |||
283 | |||
284 | |||
285 | int |
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286 | pwdcmd(argc, argv) |
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287 | int argc; |
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288 | char **argv; |
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289 | { |
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290 | getpwd(); |
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291 | out1str(curdir); |
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292 | out1c('\n'); |
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293 | return 0; |
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294 | } |
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295 | |||
296 | |||
297 | |||
298 | |||
299 | #define MAXPWD 256 |
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300 | |||
301 | /* |
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302 | * Find out what the current directory is. If we already know the current |
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303 | * directory, this routine returns immediately. |
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304 | */ |
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305 | void |
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306 | getpwd() |
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307 | { |
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308 | char buf[MAXPWD]; |
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309 | |||
310 | if (curdir) |
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311 | return; |
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312 | /* |
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313 | * Things are a bit complicated here; we could have just used |
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314 | * getcwd, but traditionally getcwd is implemented using popen |
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315 | * to /bin/pwd. This creates a problem for us, since we cannot |
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316 | * keep track of the job if it is being ran behind our backs. |
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317 | * So we re-implement getcwd(), and we suppress interrupts |
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318 | * throughout the process. This is not completely safe, since |
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319 | * the user can still break out of it by killing the pwd program. |
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320 | * We still try to use getcwd for systems that we know have a |
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321 | * c implementation of getcwd, that does not open a pipe to |
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322 | * /bin/pwd. |
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323 | */ |
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324 | #if defined(__NetBSD__) || defined(__SVR4) || defined(__GLIBC__) |
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325 | |||
326 | if (getcwd(buf, sizeof(buf)) == NULL) { |
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327 | char *pwd = getenv("PWD"); |
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328 | struct stat stdot, stpwd; |
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329 | |||
330 | if (pwd && *pwd == '/' && stat(".", &stdot) != -1 && |
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331 | stat(pwd, &stpwd) != -1 && |
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332 | stdot.st_dev == stpwd.st_dev && |
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333 | stdot.st_ino == stpwd.st_ino) { |
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334 | curdir = savestr(pwd); |
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335 | return; |
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336 | } |
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337 | error("getcwd() failed: %s", strerror(errno)); |
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338 | } |
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339 | curdir = savestr(buf); |
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340 | #else |
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341 | { |
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342 | char *p; |
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343 | int i; |
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344 | int status; |
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345 | struct job *jp; |
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346 | int pip[2]; |
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347 | |||
348 | INTOFF; |
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349 | if (pipe(pip) < 0) |
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350 | error("Pipe call failed"); |
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351 | jp = makejob((union node *)NULL, 1); |
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352 | if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) { |
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353 | (void) close(pip[0]); |
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354 | if (pip[1] != 1) { |
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355 | close(1); |
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356 | copyfd(pip[1], 1); |
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357 | close(pip[1]); |
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358 | } |
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359 | (void) execl("/bin/pwd", "pwd", (char *)0); |
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360 | error("Cannot exec /bin/pwd"); |
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361 | } |
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362 | (void) close(pip[1]); |
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363 | pip[1] = -1; |
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364 | p = buf; |
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365 | while ((i = read(pip[0], p, buf + MAXPWD - p)) > 0 |
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366 | || (i == -1 && errno == EINTR)) { |
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367 | if (i > 0) |
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368 | p += i; |
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369 | } |
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370 | (void) close(pip[0]); |
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371 | pip[0] = -1; |
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372 | status = waitforjob(jp); |
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373 | if (status != 0) |
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374 | error((char *)0); |
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375 | if (i < 0 || p == buf || p[-1] != '\n') |
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376 | error("pwd command failed"); |
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377 | p[-1] = '\0'; |
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378 | } |
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379 | curdir = savestr(buf); |
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380 | INTON; |
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381 | #endif |
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382 | } |