1 | /* $Header: /afs/dev.mit.edu/source/repository/third/tcsh/sh.exp.c,v 1.1.1.3 2005-06-03 14:35:17 ghudson Exp $ */ |
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2 | /* |
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3 | * sh.exp.c: Expression evaluations |
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4 | */ |
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5 | /*- |
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6 | * Copyright (c) 1980, 1991 The Regents of the University of California. |
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7 | * All rights reserved. |
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8 | * |
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9 | * Redistribution and use in source and binary forms, with or without |
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10 | * modification, are permitted provided that the following conditions |
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11 | * are met: |
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12 | * 1. Redistributions of source code must retain the above copyright |
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13 | * notice, this list of conditions and the following disclaimer. |
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14 | * 2. Redistributions in binary form must reproduce the above copyright |
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15 | * notice, this list of conditions and the following disclaimer in the |
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16 | * documentation and/or other materials provided with the distribution. |
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17 | * 3. Neither the name of the University nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | */ |
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33 | #include "sh.h" |
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34 | |
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35 | RCSID("$Id: sh.exp.c,v 1.1.1.3 2005-06-03 14:35:17 ghudson Exp $") |
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36 | |
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37 | #include "tw.h" |
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38 | |
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39 | /* |
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40 | * C shell |
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41 | */ |
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42 | |
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43 | #define TEXP_IGNORE 1 /* in ignore, it means to ignore value, just parse */ |
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44 | #define TEXP_NOGLOB 2 /* in ignore, it means not to globone */ |
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45 | |
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46 | #define ADDOP 1 |
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47 | #define MULOP 2 |
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48 | #define EQOP 4 |
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49 | #define RELOP 8 |
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50 | #define RESTOP 16 |
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51 | #define ANYOP 31 |
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52 | |
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53 | #define EQEQ 1 |
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54 | #define GTR 2 |
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55 | #define LSS 4 |
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56 | #define NOTEQ 6 |
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57 | #define EQMATCH 7 |
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58 | #define NOTEQMATCH 8 |
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59 | |
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60 | static int sh_access __P((Char *, int)); |
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61 | static int exp1 __P((Char ***, int)); |
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62 | static int exp2x __P((Char ***, int)); |
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63 | static int exp2a __P((Char ***, int)); |
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64 | static int exp2b __P((Char ***, int)); |
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65 | static int exp2c __P((Char ***, int)); |
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66 | static Char *exp3 __P((Char ***, int)); |
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67 | static Char *exp3a __P((Char ***, int)); |
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68 | static Char *exp4 __P((Char ***, int)); |
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69 | static Char *exp5 __P((Char ***, int)); |
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70 | static Char *exp6 __P((Char ***, int)); |
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71 | static void evalav __P((Char **)); |
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72 | static int isa __P((Char *, int)); |
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73 | static int egetn __P((Char *)); |
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74 | |
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75 | |
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76 | #ifdef EDEBUG |
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77 | static void etracc __P((char *, Char *, Char ***)); |
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78 | static void etraci __P((char *, int, Char ***)); |
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79 | #endif /* EDEBUG */ |
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80 | |
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81 | |
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82 | /* |
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83 | * shell access function according to POSIX and non POSIX |
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84 | * From Beto Appleton (beto@aixwiz.aix.ibm.com) |
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85 | */ |
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86 | static int |
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87 | sh_access(fname, mode) |
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88 | Char *fname; |
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89 | int mode; |
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90 | { |
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91 | #if defined(POSIX) && !defined(USE_ACCESS) |
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92 | struct stat statb; |
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93 | #endif /* POSIX */ |
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94 | char *name = short2str(fname); |
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95 | |
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96 | if (*name == '\0') |
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97 | return 1; |
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98 | |
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99 | #if !defined(POSIX) || defined(USE_ACCESS) |
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100 | return access(name, mode); |
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101 | #else /* POSIX */ |
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102 | |
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103 | /* |
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104 | * POSIX 1003.2-d11.2 |
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105 | * -r file True if file exists and is readable. |
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106 | * -w file True if file exists and is writable. |
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107 | * True shall indicate only that the write flag is on. |
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108 | * The file shall not be writable on a read-only file |
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109 | * system even if this test indicates true. |
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110 | * -x file True if file exists and is executable. |
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111 | * True shall indicate only that the execute flag is on. |
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112 | * If file is a directory, true indicates that the file |
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113 | * can be searched. |
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114 | */ |
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115 | if (mode != W_OK && mode != X_OK) |
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116 | return access(name, mode); |
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117 | |
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118 | if (stat(name, &statb) == -1) |
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119 | return 1; |
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120 | |
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121 | if (access(name, mode) == 0) { |
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122 | #ifdef S_ISDIR |
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123 | if (S_ISDIR(statb.st_mode) && mode == X_OK) |
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124 | return 0; |
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125 | #endif /* S_ISDIR */ |
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126 | |
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127 | /* root needs permission for someone */ |
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128 | switch (mode) { |
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129 | case W_OK: |
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130 | mode = S_IWUSR | S_IWGRP | S_IWOTH; |
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131 | break; |
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132 | case X_OK: |
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133 | mode = S_IXUSR | S_IXGRP | S_IXOTH; |
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134 | break; |
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135 | default: |
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136 | abort(); |
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137 | break; |
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138 | } |
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139 | |
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140 | } |
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141 | |
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142 | else if (euid == statb.st_uid) |
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143 | mode <<= 6; |
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144 | |
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145 | else if (egid == statb.st_gid) |
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146 | mode <<= 3; |
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147 | |
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148 | # ifdef NGROUPS_MAX |
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149 | else { |
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150 | /* you can be in several groups */ |
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151 | long n; |
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152 | GETGROUPS_T *groups; |
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153 | |
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154 | /* |
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155 | * Try these things to find a positive maximum groups value: |
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156 | * 1) sysconf(_SC_NGROUPS_MAX) |
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157 | * 2) NGROUPS_MAX |
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158 | * 3) getgroups(0, unused) |
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159 | * Then allocate and scan the groups array if one of these worked. |
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160 | */ |
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161 | # if defined (HAVE_SYSCONF) && defined (_SC_NGROUPS_MAX) |
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162 | if ((n = sysconf(_SC_NGROUPS_MAX)) == -1) |
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163 | # endif /* _SC_NGROUPS_MAX */ |
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164 | n = NGROUPS_MAX; |
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165 | if (n <= 0) |
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166 | n = getgroups(0, (GETGROUPS_T *) NULL); |
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167 | |
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168 | if (n > 0) { |
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169 | groups = xmalloc((size_t) (n * sizeof(*groups))); |
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170 | n = getgroups((int) n, groups); |
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171 | while (--n >= 0) |
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172 | if (groups[n] == statb.st_gid) { |
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173 | mode <<= 3; |
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174 | break; |
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175 | } |
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176 | } |
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177 | } |
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178 | # endif /* NGROUPS_MAX */ |
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179 | |
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180 | if (statb.st_mode & mode) |
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181 | return 0; |
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182 | else |
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183 | return 1; |
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184 | #endif /* !POSIX */ |
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185 | } |
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186 | |
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187 | int |
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188 | expr(vp) |
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189 | Char ***vp; |
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190 | { |
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191 | return (exp0(vp, 0)); |
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192 | } |
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193 | |
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194 | int |
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195 | exp0(vp, ignore) |
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196 | Char ***vp; |
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197 | int ignore; |
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198 | { |
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199 | int p1 = exp1(vp, ignore); |
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200 | |
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201 | #ifdef EDEBUG |
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202 | etraci("exp0 p1", p1, vp); |
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203 | #endif /* EDEBUG */ |
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204 | if (**vp && eq(**vp, STRor2)) { |
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205 | int p2; |
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206 | |
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207 | (*vp)++; |
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208 | p2 = exp0(vp, (ignore & TEXP_IGNORE) || p1); |
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209 | #ifdef EDEBUG |
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210 | etraci("exp0 p2", p2, vp); |
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211 | #endif /* EDEBUG */ |
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212 | return (p1 || p2); |
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213 | } |
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214 | return (p1); |
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215 | } |
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216 | |
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217 | static int |
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218 | exp1(vp, ignore) |
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219 | Char ***vp; |
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220 | int ignore; |
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221 | { |
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222 | int p1 = exp2x(vp, ignore); |
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223 | |
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224 | #ifdef EDEBUG |
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225 | etraci("exp1 p1", p1, vp); |
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226 | #endif /* EDEBUG */ |
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227 | if (**vp && eq(**vp, STRand2)) { |
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228 | int p2; |
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229 | |
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230 | (*vp)++; |
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231 | p2 = exp1(vp, (ignore & TEXP_IGNORE) || !p1); |
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232 | #ifdef EDEBUG |
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233 | etraci("exp1 p2", p2, vp); |
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234 | #endif /* EDEBUG */ |
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235 | return (p1 && p2); |
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236 | } |
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237 | return (p1); |
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238 | } |
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239 | |
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240 | static int |
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241 | exp2x(vp, ignore) |
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242 | Char ***vp; |
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243 | int ignore; |
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244 | { |
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245 | int p1 = exp2a(vp, ignore); |
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246 | |
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247 | #ifdef EDEBUG |
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248 | etraci("exp3 p1", p1, vp); |
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249 | #endif /* EDEBUG */ |
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250 | if (**vp && eq(**vp, STRor)) { |
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251 | int p2; |
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252 | |
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253 | (*vp)++; |
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254 | p2 = exp2x(vp, ignore); |
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255 | #ifdef EDEBUG |
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256 | etraci("exp3 p2", p2, vp); |
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257 | #endif /* EDEBUG */ |
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258 | return (p1 | p2); |
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259 | } |
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260 | return (p1); |
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261 | } |
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262 | |
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263 | static int |
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264 | exp2a(vp, ignore) |
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265 | Char ***vp; |
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266 | int ignore; |
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267 | { |
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268 | int p1 = exp2b(vp, ignore); |
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269 | |
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270 | #ifdef EDEBUG |
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271 | etraci("exp2a p1", p1, vp); |
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272 | #endif /* EDEBUG */ |
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273 | if (**vp && eq(**vp, STRcaret)) { |
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274 | int p2; |
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275 | |
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276 | (*vp)++; |
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277 | p2 = exp2a(vp, ignore); |
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278 | #ifdef EDEBUG |
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279 | etraci("exp2a p2", p2, vp); |
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280 | #endif /* EDEBUG */ |
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281 | return (p1 ^ p2); |
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282 | } |
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283 | return (p1); |
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284 | } |
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285 | |
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286 | static int |
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287 | exp2b(vp, ignore) |
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288 | Char ***vp; |
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289 | int ignore; |
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290 | { |
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291 | int p1 = exp2c(vp, ignore); |
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292 | |
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293 | #ifdef EDEBUG |
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294 | etraci("exp2b p1", p1, vp); |
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295 | #endif /* EDEBUG */ |
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296 | if (**vp && eq(**vp, STRand)) { |
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297 | int p2; |
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298 | |
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299 | (*vp)++; |
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300 | p2 = exp2b(vp, ignore); |
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301 | #ifdef EDEBUG |
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302 | etraci("exp2b p2", p2, vp); |
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303 | #endif /* EDEBUG */ |
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304 | return (p1 & p2); |
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305 | } |
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306 | return (p1); |
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307 | } |
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308 | |
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309 | static int |
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310 | exp2c(vp, ignore) |
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311 | Char ***vp; |
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312 | int ignore; |
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313 | { |
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314 | Char *p1 = exp3(vp, ignore); |
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315 | Char *p2; |
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316 | int i; |
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317 | |
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318 | #ifdef EDEBUG |
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319 | etracc("exp2c p1", p1, vp); |
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320 | #endif /* EDEBUG */ |
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321 | if ((i = isa(**vp, EQOP)) != 0) { |
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322 | (*vp)++; |
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323 | if (i == EQMATCH || i == NOTEQMATCH) |
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324 | ignore |= TEXP_NOGLOB; |
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325 | p2 = exp3(vp, ignore); |
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326 | #ifdef EDEBUG |
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327 | etracc("exp2c p2", p2, vp); |
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328 | #endif /* EDEBUG */ |
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329 | if (!(ignore & TEXP_IGNORE)) |
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330 | switch (i) { |
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331 | |
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332 | case EQEQ: |
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333 | i = eq(p1, p2); |
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334 | break; |
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335 | |
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336 | case NOTEQ: |
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337 | i = !eq(p1, p2); |
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338 | break; |
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339 | |
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340 | case EQMATCH: |
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341 | i = Gmatch(p1, p2); |
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342 | break; |
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343 | |
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344 | case NOTEQMATCH: |
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345 | i = !Gmatch(p1, p2); |
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346 | break; |
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347 | } |
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348 | xfree((ptr_t) p1); |
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349 | xfree((ptr_t) p2); |
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350 | return (i); |
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351 | } |
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352 | i = egetn(p1); |
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353 | xfree((ptr_t) p1); |
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354 | return (i); |
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355 | } |
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356 | |
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357 | static Char * |
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358 | exp3(vp, ignore) |
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359 | Char ***vp; |
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360 | int ignore; |
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361 | { |
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362 | Char *p1, *p2; |
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363 | int i; |
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364 | |
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365 | p1 = exp3a(vp, ignore); |
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366 | #ifdef EDEBUG |
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367 | etracc("exp3 p1", p1, vp); |
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368 | #endif /* EDEBUG */ |
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369 | if ((i = isa(**vp, RELOP)) != 0) { |
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370 | (*vp)++; |
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371 | if (**vp && eq(**vp, STRequal)) |
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372 | i |= 1, (*vp)++; |
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373 | p2 = exp3(vp, ignore); |
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374 | #ifdef EDEBUG |
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375 | etracc("exp3 p2", p2, vp); |
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376 | #endif /* EDEBUG */ |
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377 | if (!(ignore & TEXP_IGNORE)) |
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378 | switch (i) { |
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379 | |
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380 | case GTR: |
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381 | i = egetn(p1) > egetn(p2); |
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382 | break; |
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383 | |
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384 | case GTR | 1: |
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385 | i = egetn(p1) >= egetn(p2); |
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386 | break; |
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387 | |
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388 | case LSS: |
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389 | i = egetn(p1) < egetn(p2); |
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390 | break; |
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391 | |
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392 | case LSS | 1: |
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393 | i = egetn(p1) <= egetn(p2); |
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394 | break; |
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395 | } |
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396 | xfree((ptr_t) p1); |
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397 | xfree((ptr_t) p2); |
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398 | return (putn(i)); |
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399 | } |
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400 | return (p1); |
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401 | } |
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402 | |
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403 | static Char * |
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404 | exp3a(vp, ignore) |
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405 | Char ***vp; |
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406 | int ignore; |
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407 | { |
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408 | Char *p1, *p2, *op; |
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409 | int i; |
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410 | |
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411 | p1 = exp4(vp, ignore); |
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412 | #ifdef EDEBUG |
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413 | etracc("exp3a p1", p1, vp); |
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414 | #endif /* EDEBUG */ |
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415 | op = **vp; |
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416 | if (op && any("<>", op[0]) && op[0] == op[1]) { |
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417 | (*vp)++; |
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418 | p2 = exp3a(vp, ignore); |
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419 | #ifdef EDEBUG |
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420 | etracc("exp3a p2", p2, vp); |
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421 | #endif /* EDEBUG */ |
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422 | if (op[0] == '<') |
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423 | i = egetn(p1) << egetn(p2); |
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424 | else |
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425 | i = egetn(p1) >> egetn(p2); |
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426 | xfree((ptr_t) p1); |
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427 | xfree((ptr_t) p2); |
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428 | return (putn(i)); |
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429 | } |
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430 | return (p1); |
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431 | } |
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432 | |
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433 | static Char * |
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434 | exp4(vp, ignore) |
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435 | Char ***vp; |
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436 | int ignore; |
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437 | { |
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438 | Char *p1, *p2; |
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439 | int i = 0; |
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440 | |
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441 | p1 = exp5(vp, ignore); |
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442 | #ifdef EDEBUG |
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443 | etracc("exp4 p1", p1, vp); |
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444 | #endif /* EDEBUG */ |
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445 | if (isa(**vp, ADDOP)) { |
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446 | Char *op = *(*vp)++; |
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447 | |
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448 | p2 = exp4(vp, ignore); |
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449 | #ifdef EDEBUG |
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450 | etracc("exp4 p2", p2, vp); |
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451 | #endif /* EDEBUG */ |
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452 | if (!(ignore & TEXP_IGNORE)) |
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453 | switch (op[0]) { |
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454 | |
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455 | case '+': |
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456 | i = egetn(p1) + egetn(p2); |
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457 | break; |
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458 | |
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459 | case '-': |
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460 | i = egetn(p1) - egetn(p2); |
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461 | break; |
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462 | } |
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463 | xfree((ptr_t) p1); |
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464 | xfree((ptr_t) p2); |
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465 | return (putn(i)); |
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466 | } |
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467 | return (p1); |
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468 | } |
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469 | |
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470 | static Char * |
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471 | exp5(vp, ignore) |
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472 | Char ***vp; |
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473 | int ignore; |
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474 | { |
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475 | Char *p1, *p2; |
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476 | int i = 0; |
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477 | |
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478 | p1 = exp6(vp, ignore); |
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479 | #ifdef EDEBUG |
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480 | etracc("exp5 p1", p1, vp); |
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481 | #endif /* EDEBUG */ |
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482 | |
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483 | if (isa(**vp, MULOP)) { |
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484 | Char *op = *(*vp)++; |
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485 | if ((ignore & TEXP_NOGLOB) != 0) |
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486 | /* |
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487 | * We are just trying to get the right side of |
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488 | * a =~ or !~ operator |
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489 | */ |
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490 | return Strsave(op); |
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491 | |
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492 | p2 = exp5(vp, ignore); |
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493 | #ifdef EDEBUG |
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494 | etracc("exp5 p2", p2, vp); |
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495 | #endif /* EDEBUG */ |
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496 | if (!(ignore & TEXP_IGNORE)) |
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497 | switch (op[0]) { |
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498 | |
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499 | case '*': |
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500 | i = egetn(p1) * egetn(p2); |
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501 | break; |
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502 | |
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503 | case '/': |
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504 | i = egetn(p2); |
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505 | if (i == 0) |
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506 | stderror(ERR_DIV0); |
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507 | i = egetn(p1) / i; |
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508 | break; |
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509 | |
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510 | case '%': |
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511 | i = egetn(p2); |
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512 | if (i == 0) |
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513 | stderror(ERR_MOD0); |
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514 | i = egetn(p1) % i; |
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515 | break; |
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516 | } |
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517 | xfree((ptr_t) p1); |
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518 | xfree((ptr_t) p2); |
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519 | return (putn(i)); |
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520 | } |
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521 | return (p1); |
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522 | } |
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523 | |
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524 | static Char * |
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525 | exp6(vp, ignore) |
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526 | Char ***vp; |
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527 | int ignore; |
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528 | { |
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529 | int ccode, i = 0; |
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530 | Char *cp; |
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531 | |
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532 | if (**vp == 0) |
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533 | stderror(ERR_NAME | ERR_EXPRESSION); |
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534 | if (eq(**vp, STRbang)) { |
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535 | (*vp)++; |
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536 | cp = exp6(vp, ignore); |
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537 | #ifdef EDEBUG |
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538 | etracc("exp6 ! cp", cp, vp); |
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539 | #endif /* EDEBUG */ |
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540 | i = egetn(cp); |
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541 | xfree((ptr_t) cp); |
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542 | return (putn(!i)); |
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543 | } |
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544 | if (eq(**vp, STRtilde)) { |
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545 | (*vp)++; |
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546 | cp = exp6(vp, ignore); |
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547 | #ifdef EDEBUG |
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548 | etracc("exp6 ~ cp", cp, vp); |
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549 | #endif /* EDEBUG */ |
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550 | i = egetn(cp); |
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551 | xfree((ptr_t) cp); |
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552 | return (putn(~i)); |
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553 | } |
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554 | if (eq(**vp, STRLparen)) { |
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555 | (*vp)++; |
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556 | ccode = exp0(vp, ignore); |
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557 | #ifdef EDEBUG |
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558 | etraci("exp6 () ccode", ccode, vp); |
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559 | #endif /* EDEBUG */ |
---|
560 | if (*vp == 0 || **vp == 0 || ***vp != ')') |
---|
561 | stderror(ERR_NAME | ERR_EXPRESSION); |
---|
562 | (*vp)++; |
---|
563 | return (putn(ccode)); |
---|
564 | } |
---|
565 | if (eq(**vp, STRLbrace)) { |
---|
566 | Char **v; |
---|
567 | struct command faket; |
---|
568 | Char *fakecom[2]; |
---|
569 | |
---|
570 | faket.t_dtyp = NODE_COMMAND; |
---|
571 | faket.t_dflg = F_BACKQ; |
---|
572 | faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL; |
---|
573 | faket.t_dcom = fakecom; |
---|
574 | fakecom[0] = STRfakecom; |
---|
575 | fakecom[1] = NULL; |
---|
576 | (*vp)++; |
---|
577 | v = *vp; |
---|
578 | for (;;) { |
---|
579 | if (!**vp) |
---|
580 | stderror(ERR_NAME | ERR_MISSING, '}'); |
---|
581 | if (eq(*(*vp)++, STRRbrace)) |
---|
582 | break; |
---|
583 | } |
---|
584 | if (ignore & TEXP_IGNORE) |
---|
585 | return (Strsave(STRNULL)); |
---|
586 | psavejob(); |
---|
587 | if (pfork(&faket, -1) == 0) { |
---|
588 | *--(*vp) = 0; |
---|
589 | evalav(v); |
---|
590 | exitstat(); |
---|
591 | } |
---|
592 | pwait(); |
---|
593 | prestjob(); |
---|
594 | #ifdef EDEBUG |
---|
595 | etraci("exp6 {} status", egetn(varval(STRstatus)), vp); |
---|
596 | #endif /* EDEBUG */ |
---|
597 | return (putn(egetn(varval(STRstatus)) == 0)); |
---|
598 | } |
---|
599 | if (isa(**vp, ANYOP)) |
---|
600 | return (Strsave(STRNULL)); |
---|
601 | cp = *(*vp)++; |
---|
602 | #ifdef convex |
---|
603 | # define FILETESTS "erwxfdzoplstSXLbcugkmKR" |
---|
604 | #else |
---|
605 | # define FILETESTS "erwxfdzoplstSXLbcugkmK" |
---|
606 | #endif /* convex */ |
---|
607 | #define FILEVALS "ZAMCDIUGNFPL" |
---|
608 | if (*cp == '-' && (any(FILETESTS, cp[1]) || any(FILEVALS, cp[1]))) |
---|
609 | return(filetest(cp, vp, ignore)); |
---|
610 | #ifdef EDEBUG |
---|
611 | etracc("exp6 default", cp, vp); |
---|
612 | #endif /* EDEBUG */ |
---|
613 | return (ignore & TEXP_NOGLOB ? Strsave(cp) : globone(cp, G_APPEND)); |
---|
614 | } |
---|
615 | |
---|
616 | |
---|
617 | /* |
---|
618 | * Extended file tests |
---|
619 | * From: John Rowe <rowe@excc.exeter.ac.uk> |
---|
620 | */ |
---|
621 | Char * |
---|
622 | filetest(cp, vp, ignore) |
---|
623 | Char *cp, ***vp; |
---|
624 | int ignore; |
---|
625 | { |
---|
626 | #ifdef convex |
---|
627 | struct cvxstat stb, *st = NULL; |
---|
628 | # define TCSH_STAT stat64 |
---|
629 | #else |
---|
630 | # define TCSH_STAT stat |
---|
631 | struct stat stb, *st = NULL; |
---|
632 | #endif /* convex */ |
---|
633 | |
---|
634 | #ifdef S_IFLNK |
---|
635 | # ifdef convex |
---|
636 | struct cvxstat lstb, *lst = NULL; |
---|
637 | # define TCSH_LSTAT lstat64 |
---|
638 | # else |
---|
639 | # define TCSH_LSTAT lstat |
---|
640 | struct stat lstb, *lst = NULL; |
---|
641 | # endif /* convex */ |
---|
642 | char *filnam; |
---|
643 | #endif /* S_IFLNK */ |
---|
644 | |
---|
645 | int i = 0; |
---|
646 | unsigned pmask = 0xffff; |
---|
647 | int altout = 0; |
---|
648 | Char *ft = cp, *dp, *ep, *strdev, *strino, *strF, *str, valtest = '\0', |
---|
649 | *errval = STR0; |
---|
650 | char *string, string0[8]; |
---|
651 | time_t footime; |
---|
652 | struct passwd *pw; |
---|
653 | struct group *gr; |
---|
654 | |
---|
655 | while(any(FILETESTS, *++ft)) |
---|
656 | continue; |
---|
657 | |
---|
658 | if (!*ft && *(ft - 1) == 'L') |
---|
659 | --ft; |
---|
660 | |
---|
661 | if (any(FILEVALS, *ft)) { |
---|
662 | valtest = *ft++; |
---|
663 | /* |
---|
664 | * Value tests return '-1' on failure as 0 is |
---|
665 | * a legitimate value for many of them. |
---|
666 | * 'F' returns ':' for compatibility. |
---|
667 | */ |
---|
668 | errval = valtest == 'F' ? STRcolon : STRminus1; |
---|
669 | |
---|
670 | if (valtest == 'P' && *ft >= '0' && *ft <= '7') { |
---|
671 | pmask = (char) *ft - '0'; |
---|
672 | while ( *++ft >= '0' && *ft <= '7' ) |
---|
673 | pmask = 8 * pmask + ((char) *ft - '0'); |
---|
674 | } |
---|
675 | if (Strcmp(ft, STRcolon) == 0 && any("AMCUGP", valtest)) { |
---|
676 | altout = 1; |
---|
677 | ++ft; |
---|
678 | } |
---|
679 | } |
---|
680 | |
---|
681 | if (*ft || ft == cp + 1) |
---|
682 | stderror(ERR_NAME | ERR_FILEINQ); |
---|
683 | |
---|
684 | /* |
---|
685 | * Detect missing file names by checking for operator in the file name |
---|
686 | * position. However, if an operator name appears there, we must make |
---|
687 | * sure that there's no file by that name (e.g., "/") before announcing |
---|
688 | * an error. Even this check isn't quite right, since it doesn't take |
---|
689 | * globbing into account. |
---|
690 | */ |
---|
691 | |
---|
692 | if (isa(**vp, ANYOP) && TCSH_STAT(short2str(**vp), &stb)) |
---|
693 | stderror(ERR_NAME | ERR_FILENAME); |
---|
694 | |
---|
695 | dp = *(*vp)++; |
---|
696 | if (ignore & TEXP_IGNORE) |
---|
697 | return (Strsave(STRNULL)); |
---|
698 | ep = globone(dp, G_APPEND); |
---|
699 | ft = &cp[1]; |
---|
700 | do |
---|
701 | switch (*ft) { |
---|
702 | |
---|
703 | case 'r': |
---|
704 | i = !sh_access(ep, R_OK); |
---|
705 | break; |
---|
706 | |
---|
707 | case 'w': |
---|
708 | i = !sh_access(ep, W_OK); |
---|
709 | break; |
---|
710 | |
---|
711 | case 'x': |
---|
712 | i = !sh_access(ep, X_OK); |
---|
713 | break; |
---|
714 | |
---|
715 | case 'X': /* tcsh extension, name is an executable in the path |
---|
716 | * or a tcsh builtin command |
---|
717 | */ |
---|
718 | i = find_cmd(ep, 0); |
---|
719 | break; |
---|
720 | |
---|
721 | case 't': /* SGI extension, true when file is a tty */ |
---|
722 | i = isatty(atoi(short2str(ep))); |
---|
723 | break; |
---|
724 | |
---|
725 | default: |
---|
726 | |
---|
727 | #ifdef S_IFLNK |
---|
728 | if (tolower(*ft) == 'l') { |
---|
729 | /* |
---|
730 | * avoid convex compiler bug. |
---|
731 | */ |
---|
732 | if (!lst) { |
---|
733 | lst = &lstb; |
---|
734 | if (TCSH_LSTAT(short2str(ep), lst) == -1) { |
---|
735 | xfree((ptr_t) ep); |
---|
736 | return (Strsave(errval)); |
---|
737 | } |
---|
738 | } |
---|
739 | if (*ft == 'L') |
---|
740 | st = lst; |
---|
741 | } |
---|
742 | else |
---|
743 | #endif /* S_IFLNK */ |
---|
744 | /* |
---|
745 | * avoid convex compiler bug. |
---|
746 | */ |
---|
747 | if (!st) { |
---|
748 | st = &stb; |
---|
749 | if (TCSH_STAT(short2str(ep), st) == -1) { |
---|
750 | xfree((ptr_t) ep); |
---|
751 | return (Strsave(errval)); |
---|
752 | } |
---|
753 | } |
---|
754 | |
---|
755 | switch (*ft) { |
---|
756 | |
---|
757 | case 'f': |
---|
758 | #ifdef S_ISREG |
---|
759 | i = S_ISREG(st->st_mode); |
---|
760 | #else /* !S_ISREG */ |
---|
761 | i = 0; |
---|
762 | #endif /* S_ISREG */ |
---|
763 | break; |
---|
764 | |
---|
765 | case 'd': |
---|
766 | #ifdef S_ISDIR |
---|
767 | i = S_ISDIR(st->st_mode); |
---|
768 | #else /* !S_ISDIR */ |
---|
769 | i = 0; |
---|
770 | #endif /* S_ISDIR */ |
---|
771 | break; |
---|
772 | |
---|
773 | case 'p': |
---|
774 | #ifdef S_ISFIFO |
---|
775 | i = S_ISFIFO(st->st_mode); |
---|
776 | #else /* !S_ISFIFO */ |
---|
777 | i = 0; |
---|
778 | #endif /* S_ISFIFO */ |
---|
779 | break; |
---|
780 | |
---|
781 | case 'm' : |
---|
782 | #ifdef S_ISOFL |
---|
783 | i = S_ISOFL(st->st_dm_mode); |
---|
784 | #else /* !S_ISOFL */ |
---|
785 | i = 0; |
---|
786 | #endif /* S_ISOFL */ |
---|
787 | break ; |
---|
788 | |
---|
789 | case 'K' : |
---|
790 | #ifdef S_ISOFL |
---|
791 | i = stb.st_dm_key; |
---|
792 | #else /* !S_ISOFL */ |
---|
793 | i = 0; |
---|
794 | #endif /* S_ISOFL */ |
---|
795 | break ; |
---|
796 | |
---|
797 | |
---|
798 | case 'l': |
---|
799 | #ifdef S_ISLNK |
---|
800 | i = S_ISLNK(lst->st_mode); |
---|
801 | #else /* !S_ISLNK */ |
---|
802 | i = 0; |
---|
803 | #endif /* S_ISLNK */ |
---|
804 | break; |
---|
805 | |
---|
806 | case 'S': |
---|
807 | # ifdef S_ISSOCK |
---|
808 | i = S_ISSOCK(st->st_mode); |
---|
809 | # else /* !S_ISSOCK */ |
---|
810 | i = 0; |
---|
811 | # endif /* S_ISSOCK */ |
---|
812 | break; |
---|
813 | |
---|
814 | case 'b': |
---|
815 | #ifdef S_ISBLK |
---|
816 | i = S_ISBLK(st->st_mode); |
---|
817 | #else /* !S_ISBLK */ |
---|
818 | i = 0; |
---|
819 | #endif /* S_ISBLK */ |
---|
820 | break; |
---|
821 | |
---|
822 | case 'c': |
---|
823 | #ifdef S_ISCHR |
---|
824 | i = S_ISCHR(st->st_mode); |
---|
825 | #else /* !S_ISCHR */ |
---|
826 | i = 0; |
---|
827 | #endif /* S_ISCHR */ |
---|
828 | break; |
---|
829 | |
---|
830 | case 'u': |
---|
831 | i = (S_ISUID & st->st_mode) != 0; |
---|
832 | break; |
---|
833 | |
---|
834 | case 'g': |
---|
835 | i = (S_ISGID & st->st_mode) != 0; |
---|
836 | break; |
---|
837 | |
---|
838 | case 'k': |
---|
839 | i = (S_ISVTX & st->st_mode) != 0; |
---|
840 | break; |
---|
841 | |
---|
842 | case 'z': |
---|
843 | i = st->st_size == 0; |
---|
844 | break; |
---|
845 | |
---|
846 | #ifdef convex |
---|
847 | case 'R': |
---|
848 | i = (stb.st_dmonflags & IMIGRATED) == IMIGRATED; |
---|
849 | break; |
---|
850 | #endif /* convex */ |
---|
851 | |
---|
852 | case 's': |
---|
853 | i = stb.st_size != 0; |
---|
854 | break; |
---|
855 | |
---|
856 | case 'e': |
---|
857 | i = 1; |
---|
858 | break; |
---|
859 | |
---|
860 | case 'o': |
---|
861 | i = st->st_uid == uid; |
---|
862 | break; |
---|
863 | |
---|
864 | /* |
---|
865 | * Value operators are a tcsh extension. |
---|
866 | */ |
---|
867 | |
---|
868 | case 'D': |
---|
869 | i = (int) st->st_dev; |
---|
870 | break; |
---|
871 | |
---|
872 | case 'I': |
---|
873 | i = (int) st->st_ino; |
---|
874 | break; |
---|
875 | |
---|
876 | case 'F': |
---|
877 | strdev = putn( (int) st->st_dev); |
---|
878 | strino = putn( (int) st->st_ino); |
---|
879 | strF = (Char *) xmalloc((size_t) (2 + Strlen(strdev) + |
---|
880 | Strlen(strino)) * sizeof(Char)); |
---|
881 | (void) Strcat(Strcat(Strcpy(strF, strdev), STRcolon), strino); |
---|
882 | xfree((ptr_t) strdev); |
---|
883 | xfree((ptr_t) strino); |
---|
884 | xfree((ptr_t) ep); |
---|
885 | return(strF); |
---|
886 | |
---|
887 | case 'L': |
---|
888 | if ( *(ft + 1) ) { |
---|
889 | i = 1; |
---|
890 | break; |
---|
891 | } |
---|
892 | #ifdef S_ISLNK |
---|
893 | filnam = short2str(ep); |
---|
894 | #ifdef PATH_MAX |
---|
895 | # define MY_PATH_MAX PATH_MAX |
---|
896 | #else /* !PATH_MAX */ |
---|
897 | /* |
---|
898 | * I can't think of any more sensible alterative; readlink doesn't give |
---|
899 | * us an errno if the buffer isn't large enough :-( |
---|
900 | */ |
---|
901 | # define MY_PATH_MAX 2048 |
---|
902 | #endif /* PATH_MAX */ |
---|
903 | i = readlink(filnam, string = (char *) |
---|
904 | xmalloc((size_t) (1 + MY_PATH_MAX) * sizeof(char)), |
---|
905 | MY_PATH_MAX); |
---|
906 | if (i >= 0 && i <= MY_PATH_MAX) |
---|
907 | string[i] = '\0'; /* readlink does not null terminate */ |
---|
908 | strF = (i < 0) ? errval : str2short(string); |
---|
909 | xfree((ptr_t) string); |
---|
910 | xfree((ptr_t) ep); |
---|
911 | return(Strsave(strF)); |
---|
912 | |
---|
913 | #else /* !S_ISLNK */ |
---|
914 | i = 0; |
---|
915 | break; |
---|
916 | #endif /* S_ISLNK */ |
---|
917 | |
---|
918 | |
---|
919 | case 'N': |
---|
920 | i = (int) st->st_nlink; |
---|
921 | break; |
---|
922 | |
---|
923 | case 'P': |
---|
924 | string = string0 + 1; |
---|
925 | (void) xsnprintf(string, sizeof(string0) - 1, "%o", |
---|
926 | pmask & (unsigned int) |
---|
927 | ((S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID) & st->st_mode)); |
---|
928 | if (altout && *string != '0') |
---|
929 | *--string = '0'; |
---|
930 | xfree((ptr_t) ep); |
---|
931 | return(Strsave(str2short(string))); |
---|
932 | |
---|
933 | case 'U': |
---|
934 | if (altout && (pw = getpwuid(st->st_uid))) { |
---|
935 | xfree((ptr_t) ep); |
---|
936 | return(Strsave(str2short(pw->pw_name))); |
---|
937 | } |
---|
938 | i = (int) st->st_uid; |
---|
939 | break; |
---|
940 | |
---|
941 | case 'G': |
---|
942 | if ( altout && (gr = getgrgid(st->st_gid))) { |
---|
943 | xfree((ptr_t) ep); |
---|
944 | return(Strsave(str2short(gr->gr_name))); |
---|
945 | } |
---|
946 | i = (int) st->st_gid; |
---|
947 | break; |
---|
948 | |
---|
949 | case 'Z': |
---|
950 | i = (int) st->st_size; |
---|
951 | break; |
---|
952 | |
---|
953 | case 'A': case 'M': case 'C': |
---|
954 | footime = *ft == 'A' ? st->st_atime : |
---|
955 | *ft == 'M' ? st->st_mtime : st->st_ctime; |
---|
956 | if (altout) { |
---|
957 | strF = str2short(ctime(&footime)); |
---|
958 | if ((str = Strchr(strF, '\n')) != NULL) |
---|
959 | *str = (Char) '\0'; |
---|
960 | xfree((ptr_t) ep); |
---|
961 | return(Strsave(strF)); |
---|
962 | } |
---|
963 | i = (int) footime; |
---|
964 | break; |
---|
965 | |
---|
966 | } |
---|
967 | } |
---|
968 | while (*++ft && i); |
---|
969 | #ifdef EDEBUG |
---|
970 | etraci("exp6 -? i", i, vp); |
---|
971 | #endif /* EDEBUG */ |
---|
972 | xfree((ptr_t) ep); |
---|
973 | return (putn(i)); |
---|
974 | } |
---|
975 | |
---|
976 | |
---|
977 | static void |
---|
978 | evalav(v) |
---|
979 | Char **v; |
---|
980 | { |
---|
981 | struct wordent paraml1; |
---|
982 | struct wordent *hp = ¶ml1; |
---|
983 | struct command *t; |
---|
984 | struct wordent *wdp = hp; |
---|
985 | |
---|
986 | set(STRstatus, Strsave(STR0), VAR_READWRITE); |
---|
987 | hp->prev = hp->next = hp; |
---|
988 | hp->word = STRNULL; |
---|
989 | while (*v) { |
---|
990 | struct wordent *new = |
---|
991 | (struct wordent *) xcalloc(1, sizeof *wdp); |
---|
992 | |
---|
993 | new->prev = wdp; |
---|
994 | new->next = hp; |
---|
995 | wdp->next = new; |
---|
996 | wdp = new; |
---|
997 | wdp->word = Strsave(*v++); |
---|
998 | } |
---|
999 | hp->prev = wdp; |
---|
1000 | alias(¶ml1); |
---|
1001 | t = syntax(paraml1.next, ¶ml1, 0); |
---|
1002 | if (seterr) |
---|
1003 | stderror(ERR_OLD); |
---|
1004 | execute(t, -1, NULL, NULL, TRUE); |
---|
1005 | freelex(¶ml1), freesyn(t); |
---|
1006 | } |
---|
1007 | |
---|
1008 | static int |
---|
1009 | isa(cp, what) |
---|
1010 | Char *cp; |
---|
1011 | int what; |
---|
1012 | { |
---|
1013 | if (cp == 0) |
---|
1014 | return ((what & RESTOP) != 0); |
---|
1015 | if (*cp == '\0') |
---|
1016 | return 0; |
---|
1017 | if (cp[1] == 0) { |
---|
1018 | if (what & ADDOP && (*cp == '+' || *cp == '-')) |
---|
1019 | return (1); |
---|
1020 | if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%')) |
---|
1021 | return (1); |
---|
1022 | if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' || |
---|
1023 | *cp == '~' || *cp == '^' || *cp == '"')) |
---|
1024 | return (1); |
---|
1025 | } |
---|
1026 | else if (cp[2] == 0) { |
---|
1027 | if (what & RESTOP) { |
---|
1028 | if (cp[0] == '|' && cp[1] == '&') |
---|
1029 | return (1); |
---|
1030 | if (cp[0] == '<' && cp[1] == '<') |
---|
1031 | return (1); |
---|
1032 | if (cp[0] == '>' && cp[1] == '>') |
---|
1033 | return (1); |
---|
1034 | } |
---|
1035 | if (what & EQOP) { |
---|
1036 | if (cp[0] == '=') { |
---|
1037 | if (cp[1] == '=') |
---|
1038 | return (EQEQ); |
---|
1039 | if (cp[1] == '~') |
---|
1040 | return (EQMATCH); |
---|
1041 | } |
---|
1042 | else if (cp[0] == '!') { |
---|
1043 | if (cp[1] == '=') |
---|
1044 | return (NOTEQ); |
---|
1045 | if (cp[1] == '~') |
---|
1046 | return (NOTEQMATCH); |
---|
1047 | } |
---|
1048 | } |
---|
1049 | } |
---|
1050 | if (what & RELOP) { |
---|
1051 | if (*cp == '<') |
---|
1052 | return (LSS); |
---|
1053 | if (*cp == '>') |
---|
1054 | return (GTR); |
---|
1055 | } |
---|
1056 | return (0); |
---|
1057 | } |
---|
1058 | |
---|
1059 | static int |
---|
1060 | egetn(cp) |
---|
1061 | Char *cp; |
---|
1062 | { |
---|
1063 | if (*cp && *cp != '-' && !Isdigit(*cp)) |
---|
1064 | stderror(ERR_NAME | ERR_EXPRESSION); |
---|
1065 | return (getn(cp)); |
---|
1066 | } |
---|
1067 | |
---|
1068 | /* Phew! */ |
---|
1069 | |
---|
1070 | #ifdef EDEBUG |
---|
1071 | static void |
---|
1072 | etraci(str, i, vp) |
---|
1073 | char *str; |
---|
1074 | int i; |
---|
1075 | Char ***vp; |
---|
1076 | { |
---|
1077 | xprintf("%s=%d\t", str, i); |
---|
1078 | blkpr(*vp); |
---|
1079 | xputchar('\n'); |
---|
1080 | } |
---|
1081 | static void |
---|
1082 | etracc(str, cp, vp) |
---|
1083 | char *str; |
---|
1084 | Char *cp; |
---|
1085 | Char ***vp; |
---|
1086 | { |
---|
1087 | xprintf("%s=%s\t", str, cp); |
---|
1088 | blkpr(*vp); |
---|
1089 | xputchar('\n'); |
---|
1090 | } |
---|
1091 | #endif /* EDEBUG */ |
---|