1 | /* Copyright 1998 by the Massachusetts Institute of Technology. |
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2 | * |
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3 | * Permission to use, copy, modify, and distribute this |
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4 | * software and its documentation for any purpose and without |
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5 | * fee is hereby granted, provided that the above copyright |
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6 | * notice appear in all copies and that both that copyright |
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7 | * notice and this permission notice appear in supporting |
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8 | * documentation, and that the name of M.I.T. not be used in |
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9 | * advertising or publicity pertaining to distribution of the |
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10 | * software without specific, written prior permission. |
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11 | * M.I.T. makes no representations about the suitability of |
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12 | * this software for any purpose. It is provided "as is" |
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13 | * without express or implied warranty. |
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14 | */ |
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15 | |
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16 | /* This file implements the main athdir library calls. */ |
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17 | |
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18 | static const char rcsid[] = "$Id: athdir.c,v 1.6 1999-10-23 19:28:46 danw Exp $"; |
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19 | |
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20 | #include <stdio.h> |
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21 | #include <stdlib.h> |
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22 | #include <string.h> |
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23 | #include <sys/param.h> /* MAXPATHLEN */ |
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24 | #include <sys/types.h> |
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25 | #include <sys/stat.h> |
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26 | #include "athdir.h" |
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27 | #include "stringlist.h" |
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28 | |
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29 | /* Define HOSTTYPE for the platforms where `machtype`bin has historic |
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30 | * use. Never add new platforms to this list. |
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31 | */ |
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32 | #if defined(HOSTTYPE_sun4) |
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33 | #define HOSTTYPE "sun4" |
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34 | #elif defined(HOSTTYPE_linux) |
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35 | #define HOSTTYPE "linux" |
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36 | #elif defined(HOSTTYPE_inbsd) |
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37 | #define HOSTTYPE "inbsd" |
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38 | #endif |
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39 | |
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40 | #ifdef HOSTTYPE |
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41 | char *hosttype = HOSTTYPE; |
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42 | #else |
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43 | char *hosttype = NULL; |
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44 | #endif |
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45 | |
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46 | /* Definition of known conventions and what flavors they are. */ |
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47 | |
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48 | typedef struct { |
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49 | char *name; |
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50 | int flavor; |
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51 | } Convention; |
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52 | |
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53 | #define ARCHflavor (1<<0) |
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54 | #define MACHflavor (1<<1) |
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55 | #define PLAINflavor (1<<2) |
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56 | #define SYSflavor (1<<3) |
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57 | #define DEPENDENTflavor (1<<8) |
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58 | #define INDEPENDENTflavor (1<<9) |
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59 | #define ATSYSflag (1<<16) |
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60 | |
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61 | #define NUMCONVENTIONS 5 |
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62 | |
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63 | Convention conventions[NUMCONVENTIONS] = { |
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64 | { NULL, ARCHflavor | MACHflavor | PLAINflavor | |
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65 | DEPENDENTflavor | INDEPENDENTflavor }, |
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66 | { "%p/arch/%s/%t", ARCHflavor | DEPENDENTflavor | ATSYSflag }, |
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67 | { "%p/%s/%t", SYSflavor | DEPENDENTflavor | ATSYSflag }, |
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68 | { "%p/%m%t", MACHflavor | DEPENDENTflavor }, |
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69 | { "%p/%t", PLAINflavor | INDEPENDENTflavor } |
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70 | }; |
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71 | |
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72 | /* Editorial tagging for what conventions are acceptable or |
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73 | * preferable for what types. |
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74 | */ |
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75 | |
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76 | typedef struct { |
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77 | char *type; |
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78 | int allowedFlavors; /* searching parameters */ |
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79 | int preferredFlavor; /* creating paramaters */ |
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80 | } Editorial; |
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81 | |
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82 | Editorial editorials[] = { |
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83 | { "bin", ARCHflavor | SYSflavor | MACHflavor, DEPENDENTflavor }, |
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84 | { "lib", ARCHflavor | SYSflavor | MACHflavor, DEPENDENTflavor }, |
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85 | { "etc", ARCHflavor | SYSflavor | MACHflavor, DEPENDENTflavor }, |
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86 | { "man", ARCHflavor | PLAINflavor, INDEPENDENTflavor }, |
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87 | { "include", ARCHflavor | PLAINflavor, INDEPENDENTflavor }, |
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88 | { NULL, ARCHflavor | PLAINflavor, DEPENDENTflavor } |
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89 | }; |
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90 | |
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91 | /* path = template(dir, type, sys, machine) |
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92 | * %p = path (dir) |
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93 | * %t = type |
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94 | * %s = sys |
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95 | * %m = machine |
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96 | * %foo is inserted if the corresponding string is NULL. |
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97 | * If this happens, expand returns 1 (not a valid path). |
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98 | * If expand runs out of memory, it returns -1 (and path is NULL). |
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99 | * Otherwise, expand returns 0. |
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100 | */ |
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101 | static int expand(char **path, char *template, char *dir, |
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102 | char *type, char *sys, char *machine) |
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103 | { |
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104 | char *src, *dst, *oldpath; |
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105 | int somenull = 0, size; |
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106 | |
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107 | src = template; |
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108 | size = strlen(template) + 1; |
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109 | dst = oldpath = *path = malloc(size); |
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110 | *dst = '\0'; |
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111 | |
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112 | while (*src != '\0') |
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113 | { |
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114 | if (*src != '%') |
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115 | *dst++ = *src++; |
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116 | else |
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117 | { |
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118 | |
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119 | #define copystring(casec, cases, string) \ |
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120 | case casec: \ |
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121 | src++; \ |
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122 | if (string) \ |
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123 | { \ |
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124 | *path = realloc(*path, size += strlen(string)); \ |
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125 | if (!*path) \ |
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126 | return -1; \ |
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127 | dst = *path + (dst - oldpath); \ |
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128 | oldpath = *path; \ |
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129 | strcpy(dst, string); \ |
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130 | dst += strlen(string); \ |
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131 | } \ |
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132 | else \ |
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133 | { \ |
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134 | strcpy(dst, cases); \ |
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135 | dst += 2; \ |
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136 | somenull = 1; \ |
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137 | } \ |
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138 | break; |
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139 | |
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140 | src++; |
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141 | switch(*src) |
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142 | { |
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143 | copystring('p', "%p", dir); |
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144 | copystring('t', "%t", type); |
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145 | copystring('s', "%s", sys); |
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146 | copystring('m', "%m", machine); |
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147 | |
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148 | #undef copystring |
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149 | |
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150 | case '\0': |
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151 | break; |
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152 | |
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153 | default: |
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154 | *dst++ = '%'; |
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155 | *dst++ = *src++; |
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156 | break; |
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157 | } |
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158 | } |
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159 | } |
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160 | |
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161 | *dst = '\0'; |
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162 | return somenull; |
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163 | } |
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164 | |
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165 | static int template_flavor(char *template) |
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166 | { |
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167 | int flavor = ARCHflavor | MACHflavor | PLAINflavor |
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168 | | DEPENDENTflavor | INDEPENDENTflavor; |
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169 | char *ptr; |
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170 | |
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171 | if (template == NULL) |
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172 | return 0; |
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173 | |
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174 | for (ptr = strchr(template, '%'); ptr != NULL; ptr = strchr(ptr + 1, '%')) |
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175 | { |
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176 | if (*(ptr+1) == 's') |
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177 | flavor |= ATSYSflag; |
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178 | } |
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179 | |
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180 | return flavor; |
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181 | } |
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182 | |
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183 | int athdir_native(char *what, char *sys) |
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184 | { |
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185 | char *ptr; |
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186 | |
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187 | /* If sys is NULL, fall back to ATHENA_SYS if it's set, otherwise |
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188 | * use the compiled-in value. |
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189 | */ |
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190 | if (sys == NULL) |
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191 | { |
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192 | sys = getenv("ATHENA_SYS"); |
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193 | if (sys == NULL || strchr(sys, '/') != NULL) |
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194 | sys = ATHSYS; |
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195 | } |
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196 | |
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197 | for (ptr = strchr(what, sys[0]); ptr != NULL; ptr = strchr(ptr + 1, sys[0])) |
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198 | { |
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199 | if (!strncmp(ptr, sys, strlen(sys))) |
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200 | return 1; |
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201 | } |
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202 | |
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203 | return 0; |
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204 | } |
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205 | |
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206 | /* You are in a twisty little maze of interconnecting flags, all different. |
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207 | */ |
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208 | char **athdir_get_paths(char *base_path, char *type, |
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209 | char *sys, char **syscompat, char *machine, |
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210 | char *aux, int flags) |
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211 | { |
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212 | char *path; |
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213 | string_list *path_list = NULL, *compat_list = NULL; |
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214 | int t, j, complete, preferredFlavor, want_break; |
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215 | struct stat statbuf; |
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216 | char **current_compat, **mysyscompat = NULL, *compat_env; |
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217 | |
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218 | /* If sys is NULL, fall back to ATHENA_SYS if it's set, otherwise |
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219 | * use the compiled-in value. |
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220 | */ |
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221 | if (sys == NULL) |
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222 | { |
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223 | sys = getenv("ATHENA_SYS"); |
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224 | if (sys == NULL || strchr(sys, '/') != NULL) |
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225 | sys = ATHSYS; |
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226 | } |
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227 | |
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228 | /* Generate the syscompat array from the environment if it wasn't |
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229 | * passed in. |
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230 | */ |
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231 | if (syscompat == NULL) |
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232 | { |
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233 | /* We're compatible with ourselves. */ |
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234 | if (athdir__add_string(&compat_list, sys, 0)) |
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235 | return NULL; |
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236 | compat_env = getenv("ATHENA_SYS_COMPAT"); |
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237 | if (compat_env != NULL && !strchr(compat_env, '/')) |
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238 | { |
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239 | if (athdir__parse_string(&compat_list, compat_env, ':')) |
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240 | return NULL; |
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241 | } |
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242 | syscompat = mysyscompat = athdir__make_string_array(&compat_list); |
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243 | } |
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244 | |
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245 | /* If machine is NULL, use whatever was compiled in. */ |
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246 | if (machine == NULL) |
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247 | machine = hosttype; |
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248 | |
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249 | /* Zeroeth convention is optionally provided by the caller. */ |
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250 | conventions[0].name = aux; |
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251 | conventions[0].flavor = template_flavor(aux); |
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252 | |
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253 | /* Find matching editorial for the type of directory requested |
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254 | * (to be consulted later). |
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255 | */ |
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256 | for (t = 0; editorials[t].type != NULL; t++) |
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257 | { |
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258 | if (type != NULL && !strcmp(type, editorials[t].type)) |
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259 | break; |
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260 | } |
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261 | |
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262 | if (flags & ATHDIR_MACHINEDEPENDENT) |
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263 | preferredFlavor = DEPENDENTflavor; |
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264 | else |
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265 | { |
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266 | if (flags & ATHDIR_MACHINEINDEPENDENT) |
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267 | preferredFlavor = INDEPENDENTflavor; |
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268 | else |
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269 | preferredFlavor = editorials[t].preferredFlavor; |
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270 | } |
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271 | |
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272 | /* Cycle through matching conventions */ |
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273 | for (j = 0; j < NUMCONVENTIONS; j++) |
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274 | { |
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275 | if (conventions[j].name == NULL) |
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276 | continue; /* conventions[0], the caller specified convention, |
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277 | * is not set. */ |
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278 | want_break = 0; |
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279 | |
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280 | if ( |
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281 | /* If the editorial says this is a reasonable convention |
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282 | * for this type |
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283 | */ |
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284 | (editorials[t].allowedFlavors & conventions[j].flavor) || |
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285 | |
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286 | /* or we don't care what the editorials say */ |
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287 | (flags & ATHDIR_SUPPRESSEDITORIALS) || |
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288 | |
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289 | /* or something more explicit than the editorials has been |
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290 | * specified |
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291 | */ |
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292 | (((ATHDIR_MACHINEDEPENDENT | ATHDIR_MACHINEINDEPENDENT) & flags) && |
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293 | (flags & ATHDIR_SUPPRESSSEARCH))) |
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294 | { |
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295 | /* If we're looking for a specific flavor (machine dependent/ |
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296 | * machine independent) and this isn't it, keep going. |
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297 | */ |
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298 | if ((ATHDIR_SUPPRESSSEARCH & flags) && |
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299 | !(preferredFlavor & conventions[j].flavor)) |
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300 | continue; |
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301 | |
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302 | for (current_compat = syscompat; *current_compat != NULL; |
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303 | current_compat++) |
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304 | { |
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305 | complete = !expand(&path, conventions[j].name, |
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306 | base_path, type, *current_compat, hosttype); |
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307 | |
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308 | if (!path) |
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309 | return NULL; |
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310 | |
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311 | /* If we're listing everything, or we only care about the |
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312 | * first match for creation purposes (both cases where we |
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313 | * don't want to stat()), store this match. |
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314 | */ |
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315 | if ((flags & ATHDIR_LISTSEARCHDIRECTORIES) || |
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316 | ((flags & ATHDIR_SUPPRESSSEARCH) && complete)) |
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317 | { |
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318 | if (athdir__add_string(&path_list, path, 0)) |
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319 | { |
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320 | free(path); |
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321 | return NULL; |
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322 | } |
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323 | free(path); |
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324 | |
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325 | /* In this case (first match for creation) we're done. */ |
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326 | if (flags & ATHDIR_SUPPRESSSEARCH) |
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327 | { |
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328 | want_break = 1; |
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329 | break; |
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330 | } |
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331 | } |
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332 | else /* If it's there, store it and be done. */ |
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333 | if (complete && !stat(path, &statbuf)) |
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334 | { |
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335 | if (athdir__add_string(&path_list, path, 0)) |
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336 | { |
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337 | free(path); |
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338 | return NULL; |
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339 | } |
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340 | free(path); |
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341 | want_break = 1; |
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342 | break; |
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343 | } |
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344 | else |
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345 | free(path); |
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346 | |
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347 | /* Don't loop over @sys values unless ATSYSflag. */ |
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348 | if (!(conventions[j].flavor & ATSYSflag)) |
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349 | break; |
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350 | } |
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351 | } |
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352 | |
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353 | if (want_break) |
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354 | break; |
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355 | } |
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356 | |
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357 | athdir__free_string_array(mysyscompat); |
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358 | return athdir__make_string_array(&path_list); |
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359 | } |
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360 | |
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361 | void athdir_free_paths(char **paths) |
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362 | { |
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363 | athdir__free_string_array(paths); |
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364 | } |
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