1 | #include <glob.h>
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2 | #include <fnmatch.h>
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3 | #include <sys/stat.h>
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4 | #include <dirent.h>
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5 | #include <limits.h>
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6 | #include <string.h>
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7 | #include <stdlib.h>
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8 | #include <errno.h>
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9 | #include <stddef.h>
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10 | #include "libc.h"
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11 |
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12 | struct match
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13 | {
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14 | struct match *next;
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15 | char name[1];
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16 | };
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17 |
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18 | static int is_literal(const char *p, int useesc)
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19 | {
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20 | int bracket = 0;
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21 | for (; *p; p++) {
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22 | switch (*p) {
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23 | case '\\':
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24 | if (!useesc) break;
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25 | case '?':
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26 | case '*':
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27 | return 0;
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28 | case '[':
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29 | bracket = 1;
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30 | break;
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31 | case ']':
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32 | if (bracket) return 0;
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33 | break;
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34 | }
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35 | }
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36 | return 1;
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37 | }
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38 |
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39 | static int append(struct match **tail, const char *name, size_t len, int mark)
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40 | {
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41 | struct match *new = malloc(sizeof(struct match) + len + 1);
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42 | if (!new) return -1;
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43 | (*tail)->next = new;
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44 | new->next = NULL;
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45 | strcpy(new->name, name);
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46 | if (mark) strcat(new->name, "/");
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47 | *tail = new;
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48 | return 0;
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49 | }
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50 |
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51 | static int match_in_dir(const char *d, const char *p, int flags, int (*errfunc)(const char *path, int err), struct match **tail)
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52 | {
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53 | DIR *dir;
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54 | struct dirent de_buf, *de;
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55 | char pat[strlen(p)+1];
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56 | char *p2;
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57 | size_t l = strlen(d);
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58 | int literal;
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59 | int fnm_flags= ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)
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60 | | ((!(flags & GLOB_PERIOD)) ? FNM_PERIOD : 0);
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61 | int error;
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62 |
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63 | if ((p2 = strchr(p, '/'))) {
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64 | strcpy(pat, p);
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65 | pat[p2-p] = 0;
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66 | for (; *p2 == '/'; p2++);
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67 | p = pat;
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68 | }
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69 | literal = is_literal(p, !(flags & GLOB_NOESCAPE));
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70 | if (*d == '/' && !*(d+1)) l = 0;
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71 |
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72 | /* rely on opendir failing for nondirectory objects */
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73 | dir = opendir(*d ? d : ".");
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74 | error = errno;
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75 | if (!dir) {
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76 | /* this is not an error -- we let opendir call stat for us */
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77 | if (error == ENOTDIR) return 0;
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78 | if (error == EACCES && !*p) {
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79 | struct stat st;
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80 | if (!stat(d, &st) && S_ISDIR(st.st_mode)) {
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81 | if (append(tail, d, l, l))
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82 | return GLOB_NOSPACE;
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83 | return 0;
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84 | }
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85 | }
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86 | if (errfunc(d, error) || (flags & GLOB_ERR))
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87 | return GLOB_ABORTED;
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88 | return 0;
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89 | }
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90 | if (!*p) {
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91 | error = append(tail, d, l, l) ? GLOB_NOSPACE : 0;
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92 | closedir(dir);
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93 | return error;
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94 | }
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95 | while (!(error = readdir_r(dir, &de_buf, &de)) && de) {
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96 | char namebuf[l+de->d_reclen+2], *name = namebuf;
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97 | if (!literal && fnmatch(p, de->d_name, fnm_flags))
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98 | continue;
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99 | if (literal && strcmp(p, de->d_name))
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100 | continue;
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101 | if (p2 && de->d_type && !S_ISDIR(de->d_type<<12) && !S_ISLNK(de->d_type<<12))
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102 | continue;
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103 | /* With GLOB_PERIOD, don't allow matching . or .. unless
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104 | * fnmatch would match them with FNM_PERIOD rules in effect. */
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105 | if (p2 && (flags & GLOB_PERIOD) && de->d_name[0]=='.'
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106 | && (!de->d_name[1] || de->d_name[1]=='.' && !de->d_name[2])
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107 | && fnmatch(p, de->d_name, fnm_flags | FNM_PERIOD))
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108 | continue;
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109 | if (*d) {
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110 | memcpy(name, d, l);
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111 | name[l] = '/';
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112 | strcpy(name+l+1, de->d_name);
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113 | } else {
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114 | name = de->d_name;
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115 | }
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116 | if (p2) {
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117 | if ((error = match_in_dir(name, p2, flags, errfunc, tail))) {
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118 | closedir(dir);
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119 | return error;
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120 | }
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121 | } else {
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122 | int mark = 0;
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123 | if (flags & GLOB_MARK) {
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124 | if (de->d_type && !S_ISLNK(de->d_type<<12))
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125 | mark = S_ISDIR(de->d_type<<12);
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126 | else {
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127 | struct stat st;
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128 | stat(name, &st);
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129 | mark = S_ISDIR(st.st_mode);
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130 | }
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131 | }
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132 | if (append(tail, name, l+de->d_reclen+1, mark)) {
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133 | closedir(dir);
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134 | return GLOB_NOSPACE;
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135 | }
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136 | }
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137 | }
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138 | closedir(dir);
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139 | if (error && (errfunc(d, error) || (flags & GLOB_ERR)))
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140 | return GLOB_ABORTED;
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141 | return 0;
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142 | }
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143 |
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144 | static int ignore_err(const char *path, int err)
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145 | {
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146 | return 0;
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147 | }
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148 |
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149 | static void freelist(struct match *head)
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150 | {
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151 | struct match *match, *next;
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152 | for (match=head->next; match; match=next) {
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153 | next = match->next;
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154 | free(match);
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155 | }
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156 | }
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157 |
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158 | static int sort(const void *a, const void *b)
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159 | {
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160 | return strcmp(*(const char **)a, *(const char **)b);
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161 | }
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162 |
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163 | int glob(const char *restrict pat, int flags, int (*errfunc)(const char *path, int err), glob_t *restrict g)
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164 | {
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165 | const char *p=pat, *d;
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166 | struct match head = { .next = NULL }, *tail = &head;
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167 | size_t cnt, i;
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168 | size_t offs = (flags & GLOB_DOOFFS) ? g->gl_offs : 0;
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169 | int error = 0;
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170 |
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171 | if (*p == '/') {
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172 | for (; *p == '/'; p++);
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173 | d = "/";
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174 | } else {
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175 | d = "";
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176 | }
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177 |
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178 | if (!errfunc) errfunc = ignore_err;
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179 |
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180 | if (!(flags & GLOB_APPEND)) {
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181 | g->gl_offs = offs;
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182 | g->gl_pathc = 0;
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183 | g->gl_pathv = NULL;
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184 | }
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185 |
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186 | if (strnlen(p, PATH_MAX+1) > PATH_MAX) return GLOB_NOSPACE;
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187 |
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188 | if (*pat) error = match_in_dir(d, p, flags, errfunc, &tail);
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189 | if (error == GLOB_NOSPACE) {
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190 | freelist(&head);
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191 | return error;
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192 | }
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193 |
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194 | for (cnt=0, tail=head.next; tail; tail=tail->next, cnt++);
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195 | if (!cnt) {
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196 | if (flags & GLOB_NOCHECK) {
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197 | tail = &head;
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198 | if (append(&tail, pat, strlen(pat), 0))
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199 | return GLOB_NOSPACE;
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200 | cnt++;
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201 | } else
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202 | return GLOB_NOMATCH;
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203 | }
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204 |
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205 | if (flags & GLOB_APPEND) {
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206 | char **pathv = realloc(g->gl_pathv, (offs + g->gl_pathc + cnt + 1) * sizeof(char *));
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207 | if (!pathv) {
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208 | freelist(&head);
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209 | return GLOB_NOSPACE;
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210 | }
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211 | g->gl_pathv = pathv;
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212 | offs += g->gl_pathc;
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213 | } else {
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214 | g->gl_pathv = malloc((offs + cnt + 1) * sizeof(char *));
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215 | if (!g->gl_pathv) {
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216 | freelist(&head);
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217 | return GLOB_NOSPACE;
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218 | }
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219 | for (i=0; i<offs; i++)
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220 | g->gl_pathv[i] = NULL;
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221 | }
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222 | for (i=0, tail=head.next; i<cnt; tail=tail->next, i++)
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223 | g->gl_pathv[offs + i] = tail->name;
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224 | g->gl_pathv[offs + i] = NULL;
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225 | g->gl_pathc += cnt;
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226 |
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227 | if (!(flags & GLOB_NOSORT))
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228 | qsort(g->gl_pathv+offs, cnt, sizeof(char *), sort);
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229 |
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230 | return error;
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231 | }
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232 |
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233 | void globfree(glob_t *g)
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234 | {
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235 | size_t i;
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236 | for (i=0; i<g->gl_pathc; i++)
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237 | free(g->gl_pathv[g->gl_offs + i] - offsetof(struct match, name));
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238 | free(g->gl_pathv);
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239 | g->gl_pathc = 0;
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240 | g->gl_pathv = NULL;
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241 | }
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242 |
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243 | LFS64(glob);
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244 | LFS64(globfree);
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