forked from lix-project/lix
193 lines
3.8 KiB
C++
193 lines
3.8 KiB
C++
#include <iostream>
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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 "util.hh"
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string thisSystem = SYSTEM;
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Error::Error(const format & f)
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{
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err = f.str();
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}
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SysError::SysError(const format & f)
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: Error(format("%1%: %2%") % f.str() % strerror(errno))
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{
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}
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string absPath(string path, string dir)
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{
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if (path[0] != '/') {
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if (dir == "") {
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char buf[PATH_MAX];
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if (!getcwd(buf, sizeof(buf)))
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throw SysError("cannot get cwd");
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dir = buf;
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}
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path = dir + "/" + path;
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}
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return canonPath(path);
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}
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string canonPath(const string & path)
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{
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string s;
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if (path[0] != '/')
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throw Error(format("not an absolute path: `%1%'") % path);
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string::const_iterator i = path.begin(), end = path.end();
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while (1) {
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/* Skip slashes. */
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while (i != end && *i == '/') i++;
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if (i == end) break;
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/* Ignore `.'. */
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if (*i == '.' && (i + 1 == end || i[1] == '/'))
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i++;
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/* If `..', delete the last component. */
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else if (*i == '.' && i + 1 < end && i[1] == '.' &&
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(i + 2 == end || i[2] == '/'))
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{
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if (!s.empty()) s.erase(s.rfind('/'));
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i += 2;
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}
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/* Normal component; copy it. */
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else {
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s += '/';
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while (i != end && *i != '/') s += *i++;
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}
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}
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return s.empty() ? "/" : s;
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}
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string dirOf(string path)
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{
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unsigned int pos = path.rfind('/');
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if (pos == string::npos)
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throw Error(format("invalid file name: %1%") % path);
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return string(path, 0, pos);
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}
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string baseNameOf(string path)
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{
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unsigned int pos = path.rfind('/');
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if (pos == string::npos)
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throw Error(format("invalid file name %1% ") % path);
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return string(path, pos + 1);
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}
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bool pathExists(const string & path)
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{
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int res;
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struct stat st;
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res = stat(path.c_str(), &st);
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if (!res) return true;
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if (errno != ENOENT)
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throw SysError(format("getting status of %1%") % path);
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return false;
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}
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void deletePath(string path)
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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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deletePath(path + "/" + name);
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}
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closedir(dir); /* !!! close on exception */
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}
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if (remove(path.c_str()) == -1)
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throw SysError(format("cannot unlink %1%") % path);
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}
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Verbosity verbosity = lvlError;
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static int nestingLevel = 0;
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Nest::Nest(Verbosity level, const format & f)
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{
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if (level > verbosity)
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nest = false;
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else {
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msg(level, f);
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nest = true;
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nestingLevel++;
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}
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}
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Nest::~Nest()
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{
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if (nest) nestingLevel--;
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}
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void msg(Verbosity level, const format & f)
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{
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if (level > verbosity) return;
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string spaces;
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for (int i = 0; i < nestingLevel; i++)
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spaces += "| ";
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cerr << format("%1%%2%\n") % spaces % f.str();
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}
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void debug(const format & f)
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{
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msg(lvlDebug, f);
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}
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void readFull(int fd, unsigned char * buf, size_t count)
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{
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while (count) {
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ssize_t res = read(fd, (char *) buf, count);
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if (res == -1) throw SysError("reading from file");
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if (res == 0) throw Error("unexpected end-of-file");
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count -= res;
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buf += res;
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}
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}
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void writeFull(int fd, const unsigned char * buf, size_t count)
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{
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while (count) {
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ssize_t res = write(fd, (char *) buf, count);
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if (res == -1) throw SysError("writing to file");
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count -= res;
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buf += res;
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}
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}
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