1 | #include <ftw.h>
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2 | #include <dirent.h>
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3 | #include <sys/stat.h>
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4 | #include <errno.h>
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5 | #include <unistd.h>
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6 | #include <string.h>
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7 | #include <limits.h>
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8 | #include <pthread.h>
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9 | #include "libc.h"
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10 |
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11 | struct history
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12 | {
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13 | struct history *chain;
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14 | dev_t dev;
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15 | ino_t ino;
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16 | int level;
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17 | int base;
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18 | };
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19 |
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20 | #undef dirfd
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21 | #define dirfd(d) (*(int *)d)
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22 |
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23 | static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags, struct history *h)
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24 | {
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25 | size_t l = strlen(path), j = l && path[l-1]=='/' ? l-1 : l;
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26 | struct stat st;
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27 | struct history new;
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28 | int type;
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29 | int r;
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30 | struct FTW lev;
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31 |
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32 | if ((flags & FTW_PHYS) ? lstat(path, &st) : stat(path, &st) < 0) {
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33 | if (!(flags & FTW_PHYS) && errno==ENOENT && !lstat(path, &st))
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34 | type = FTW_SLN;
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35 | else if (errno != EACCES) return -1;
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36 | else type = FTW_NS;
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37 | } else if (S_ISDIR(st.st_mode)) {
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38 | if (access(path, R_OK) < 0) type = FTW_DNR;
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39 | else if (flags & FTW_DEPTH) type = FTW_DP;
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40 | else type = FTW_D;
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41 | } else if (S_ISLNK(st.st_mode)) {
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42 | if (flags & FTW_PHYS) type = FTW_SL;
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43 | else type = FTW_SLN;
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44 | } else {
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45 | type = FTW_F;
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46 | }
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47 |
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48 | if ((flags & FTW_MOUNT) && h && st.st_dev != h->dev)
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49 | return 0;
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50 |
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51 | new.chain = h;
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52 | new.dev = st.st_dev;
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53 | new.ino = st.st_ino;
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54 | new.level = h ? h->level+1 : 0;
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55 | new.base = j+1;
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56 |
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57 | lev.level = new.level;
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58 | if (h) {
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59 | lev.base = h->base;
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60 | } else {
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61 | size_t k;
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62 | for (k=j; k && path[k]=='/'; k--);
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63 | for (; k && path[k-1]!='/'; k--);
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64 | lev.base = k;
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65 | }
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66 |
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67 | if (!(flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
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68 | return r;
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69 |
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70 | for (; h; h = h->chain)
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71 | if (h->dev == st.st_dev && h->ino == st.st_ino)
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72 | return 0;
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73 |
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74 | if ((type == FTW_D || type == FTW_DP) && fd_limit) {
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75 | DIR *d = opendir(path);
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76 | if (d) {
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77 | struct dirent *de;
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78 | while ((de = readdir(d))) {
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79 | if (de->d_name[0] == '.'
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80 | && (!de->d_name[1]
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81 | || (de->d_name[1]=='.'
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82 | && !de->d_name[2]))) continue;
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83 | if (strlen(de->d_name) >= PATH_MAX-l) {
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84 | errno = ENAMETOOLONG;
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85 | closedir(d);
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86 | return -1;
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87 | }
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88 | path[j]='/';
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89 | strcpy(path+j+1, de->d_name);
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90 | if ((r=do_nftw(path, fn, fd_limit-1, flags, &new))) {
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91 | closedir(d);
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92 | return r;
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93 | }
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94 | }
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95 | closedir(d);
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96 | } else if (errno != EACCES) {
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97 | return -1;
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98 | }
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99 | }
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100 |
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101 | path[l] = 0;
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102 | if ((flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
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103 | return r;
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104 |
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105 | return 0;
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106 | }
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107 |
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108 | int nftw(const char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags)
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109 | {
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110 | int r, cs;
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111 | size_t l;
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112 | char pathbuf[PATH_MAX+1];
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113 |
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114 | if (fd_limit <= 0) return 0;
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115 |
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116 | l = strlen(path);
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117 | if (l > PATH_MAX) {
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118 | errno = ENAMETOOLONG;
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119 | return -1;
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120 | }
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121 | memcpy(pathbuf, path, l+1);
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122 |
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123 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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124 | r = do_nftw(pathbuf, fn, fd_limit, flags, NULL);
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125 | pthread_setcancelstate(cs, 0);
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126 | return r;
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127 | }
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128 |
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129 | LFS64(nftw);
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