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annotate target-utils/libmpffs/basicfind.c @ 101:7029fe8ae0bc

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pirexplore: FFS find command implemented
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Mon, 02 Sep 2013 00:33:54 +0000
parents
children 7f75ffdd674f
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101
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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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;
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95 size_t size;
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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;
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132 size_t size;
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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;
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
138 if (irec->sibling == 0xFFFF) {
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
139 printf("Error: segment inode #%d: deleted and no sibling\n",
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
140 ino);
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
141 return(-1);
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
142 }
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
143 ino = irec->sibling;
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
144 }
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
145 if (irec->type != OBJTYPE_SEGMENT) {
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
146 printf("Error: inode #%x is not a segment\n", ino);
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
147 return(-1);
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
148 }
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
149 start = inode_to_dataptr(irec);
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
150 end = find_endofchunk(ino);
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
151 size = end - start;
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
152 if (size <= 0) {
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
153 printf("Error: segment inode #%x: bad length\n", ino);
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
154 return(-1);
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
155 }
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
156 cont = irec->descend;
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
157 if (cont == 0xFFFF)
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
158 cont = 0;
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
159 if (startret)
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
160 *startret = start;
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
161 if (sizeret)
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
162 *sizeret = size;
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
163 if (continue_ret)
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
164 *continue_ret = cont;
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
165 return(0);
7029fe8ae0bc pirexplore: FFS find command implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
166 }