111 lines
2.8 KiB
C++
111 lines
2.8 KiB
C++
#include <map>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include "references.hh"
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#include "hash.hh"
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static void search(const string & s,
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Strings & ids, Strings & seen)
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{
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for (Strings::iterator i = ids.begin();
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i != ids.end(); )
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{
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if (s.find(*i) == string::npos)
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i++;
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else {
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debug(format("found reference to `%1%'") % *i);
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seen.push_back(*i);
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i = ids.erase(i);
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}
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}
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}
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void checkPath(const string & path,
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Strings & ids, Strings & seen)
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{
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struct stat st;
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if (lstat(path.c_str(), &st))
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throw SysError(format("getting attributes of path `%1%'") % path);
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if (S_ISDIR(st.st_mode)) {
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DIR * dir = opendir(path.c_str());
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struct dirent * dirent;
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while (errno = 0, dirent = readdir(dir)) {
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string name = dirent->d_name;
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if (name == "." || name == "..") continue;
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search(name, ids, seen);
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checkPath(path + "/" + name, ids, seen);
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}
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closedir(dir); /* !!! close on exception */
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}
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else if (S_ISREG(st.st_mode)) {
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debug(format("checking `%1%'") % path);
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int fd = open(path.c_str(), O_RDONLY);
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if (fd == -1) throw SysError(format("opening file `%1%'") % path);
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char * buf = new char[st.st_size];
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if (read(fd, buf, st.st_size) != st.st_size)
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throw SysError(format("reading file %1%") % path);
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search(string(buf, st.st_size), ids, seen);
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delete buf; /* !!! autodelete */
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close(fd); /* !!! close on exception */
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}
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else if (S_ISLNK(st.st_mode)) {
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char buf[st.st_size];
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if (readlink(path.c_str(), buf, st.st_size) != st.st_size)
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throw SysError(format("reading symbolic link `%1%'") % path);
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search(string(buf, st.st_size), ids, seen);
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}
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else throw Error(format("unknown file type: %1%") % path);
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}
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Strings filterReferences(const string & path, const Strings & paths)
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{
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map<string, string> backMap;
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Strings ids;
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Strings seen;
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/* For efficiency (and a higher hit rate), just search for the
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hash part of the file name. (This assumes that all references
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have the form `HASH-bla'). */
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for (Strings::const_iterator i = paths.begin();
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i != paths.end(); i++)
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{
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string s = string(baseNameOf(*i), 0, 32);
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parseHash(s);
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ids.push_back(s);
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backMap[s] = *i;
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}
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checkPath(path, ids, seen);
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Strings found;
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for (Strings::iterator i = seen.begin(); i != seen.end(); i++)
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{
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map<string, string>::iterator j;
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if ((j = backMap.find(*i)) == backMap.end()) abort();
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found.push_back(j->second);
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}
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return found;
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}
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