src/regex/glob.c

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