FreeCalypso > hg > freecalypso-sw
annotate target-utils/libmpffs/basicfind.c @ 102:7f75ffdd674f
pirexplore FFS: buglet fixed, works now
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Mon, 02 Sep 2013 00:41:18 +0000 |
parents | 7029fe8ae0bc |
children | ac310ee73788 |
rev | line source |
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1 #include <sys/types.h> |
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2 #include "types.h" |
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3 #include "struct.h" |
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4 #include "globals.h" |
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5 #include "macros.h" |
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6 |
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7 extern char *index(); |
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8 |
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9 static u8 * |
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10 find_endofchunk(ino) |
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11 { |
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12 struct inode *irec = mpffs_active_index + ino; |
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13 u8 *p; |
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14 int i; |
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15 |
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16 p = inode_to_dataptr(irec) + irec->len; |
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17 for (i = 0; i < 16; i++) { |
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18 p--; |
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19 if (!*p) |
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20 return(p); |
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21 if (*p != 0xFF) |
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22 break; |
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23 } |
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24 printf("Error: inode #%x has no valid termination\n", ino); |
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25 return(p); /* XXX */ |
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26 } |
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27 |
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28 static |
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29 find_named_child(start, seekname) |
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30 char *seekname; |
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31 { |
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32 int ino; |
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33 struct inode *irec; |
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34 |
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35 for (ino = start; ino != 0xFFFF; ino = irec->sibling) { |
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36 irec = mpffs_active_index + ino; |
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37 if (!irec->type) |
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38 continue; |
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39 if (!strcmp(inode_to_dataptr(irec), seekname)) |
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40 return(ino); |
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41 } |
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42 return(0); |
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43 } |
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44 |
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45 mpffs_pathname_to_inode(pathname) |
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46 char *pathname; |
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47 { |
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48 int ino, stat; |
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49 struct inode *irec; |
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50 char *cur, *next; |
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51 |
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52 stat = mpffs_init(); |
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53 if (stat < 0) |
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54 return(stat); |
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55 cur = pathname; |
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56 if (*cur == '/') |
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57 cur++; |
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58 for (ino = mpffs_root_ino; cur; cur = next) { |
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59 if (!*cur) |
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60 break; |
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61 next = index(cur, '/'); |
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62 if (next == cur) { |
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63 printf("malformed pathname: multiple adjacent slashes\n"); |
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64 return(-1); |
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65 } |
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66 if (next) |
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67 *next++ = '\0'; |
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68 irec = mpffs_active_index + ino; |
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69 if (irec->type != OBJTYPE_DIR) { |
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70 printf("Error: non-terminal non-directory\n"); |
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71 if (next) |
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72 next[-1] = '/'; |
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73 return(-1); |
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74 } |
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75 ino = find_named_child(irec->descend, cur); |
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76 if (next) |
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77 next[-1] = '/'; |
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78 if (!ino) { |
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79 printf("Error: pathname component not found\n"); |
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80 return(-1); |
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81 } |
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82 } |
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83 return(ino); |
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84 } |
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85 |
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86 mpffs_find_file(pathname, startret, sizeret, continue_ret) |
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87 char *pathname; |
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88 u8 **startret; |
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89 size_t *sizeret; |
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90 int *continue_ret; |
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91 { |
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92 int ino, cont; |
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93 struct inode *irec; |
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94 u8 *start, *end; |
102
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95 int size; |
101
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96 |
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97 ino = mpffs_pathname_to_inode(pathname); |
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98 if (ino <= 0) |
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99 return(-1); |
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100 irec = mpffs_active_index + ino; |
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101 if (irec->type != OBJTYPE_FILE) { |
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102 printf("Error: %s is not a regular file\n", pathname); |
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103 return(-1); |
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104 } |
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105 start = inode_to_dataptr(irec); |
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106 start += strlen(start) + 1; |
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107 end = find_endofchunk(ino); |
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108 size = end - start; |
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109 if (size < 0) |
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110 size = 0; |
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111 cont = irec->descend; |
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112 if (cont == 0xFFFF) |
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113 cont = 0; |
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114 if (startret) |
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115 *startret = start; |
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116 if (sizeret) |
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117 *sizeret = size; |
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118 if (continue_ret) |
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119 *continue_ret = cont; |
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120 return(0); |
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121 } |
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122 |
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123 mpffs_get_segment(ino, startret, sizeret, continue_ret) |
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124 int ino; |
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125 u8 **startret; |
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126 size_t *sizeret; |
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127 int *continue_ret; |
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128 { |
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129 int cont; |
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130 struct inode *irec; |
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131 u8 *start, *end; |
102
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132 int size; |
101
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133 |
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134 for (;;) { |
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135 irec = mpffs_active_index + ino; |
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136 if (irec->type) |
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137 break; |
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138 if (irec->sibling == 0xFFFF) { |
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139 printf("Error: segment inode #%d: deleted and no sibling\n", |
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140 ino); |
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141 return(-1); |
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142 } |
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143 ino = irec->sibling; |
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144 } |
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145 if (irec->type != OBJTYPE_SEGMENT) { |
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146 printf("Error: inode #%x is not a segment\n", ino); |
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147 return(-1); |
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148 } |
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149 start = inode_to_dataptr(irec); |
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150 end = find_endofchunk(ino); |
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151 size = end - start; |
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152 if (size <= 0) { |
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153 printf("Error: segment inode #%x: bad length\n", ino); |
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154 return(-1); |
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155 } |
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156 cont = irec->descend; |
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157 if (cont == 0xFFFF) |
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158 cont = 0; |
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159 if (startret) |
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160 *startret = start; |
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161 if (sizeret) |
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162 *sizeret = size; |
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163 if (continue_ret) |
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164 *continue_ret = cont; |
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165 return(0); |
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166 } |