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// Copyright (C) Andrew Tridgell 2002 (original file)
// Copyright (C) 2006 Red Hat Inc. (systemtap changes)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#include "util.h"
#include <stdexcept>
#include <cerrno>
extern "C" {
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
}
using namespace std;
// Return current users home directory or die.
const char *
get_home_directory(void)
{
const char *p = getenv("HOME");
if (p)
return p;
struct passwd *pwd = getpwuid(getuid());
if (pwd)
return pwd->pw_dir;
throw runtime_error("Unable to determine home directory");
return NULL;
}
// Copy a file. The copy is done via a temporary file and atomic
// rename.
int
copy_file(const char *src, const char *dest)
{
int fd1, fd2;
char buf[10240];
int n;
string tmp;
char *tmp_name;
mode_t mask;
// Open the src file.
fd1 = open(src, O_RDONLY);
if (fd1 == -1)
return -1;
// Open the temporary output file.
tmp = dest + string(".XXXXXX");
tmp_name = (char *)tmp.c_str();
fd2 = mkstemp(tmp_name);
if (fd2 == -1)
{
close(fd1);
return -1;
}
// Copy the src file to the temporary output file.
while ((n = read(fd1, buf, sizeof(buf))) > 0)
{
if (write(fd2, buf, n) != n)
{
close(fd2);
close(fd1);
unlink(tmp_name);
return -1;
}
}
close(fd1);
// Set the permissions on the temporary output file.
mask = umask(0);
fchmod(fd2, 0666 & ~mask);
umask(mask);
// Close the temporary output file. The close can fail on NFS if
// out of space.
if (close(fd2) == -1)
{
unlink(tmp_name);
return -1;
}
// Rename the temporary output file to the destination file.
unlink(dest);
if (rename(tmp_name, dest) == -1)
{
unlink(tmp_name);
return -1;
}
return 0;
}
// Make sure a directory exists.
int
create_dir(const char *dir)
{
struct stat st;
if (stat(dir, &st) == 0)
{
if (S_ISDIR(st.st_mode))
return 0;
errno = ENOTDIR;
return 1;
}
if (mkdir(dir, 0777) != 0 && errno != EEXIST)
return 1;
return 0;
}
void
tokenize(const string& str, vector<string>& tokens,
const string& delimiters = " ")
{
// Skip delimiters at beginning.
string::size_type lastPos = str.find_first_not_of(delimiters, 0);
// Find first "non-delimiter".
string::size_type pos = str.find_first_of(delimiters, lastPos);
while (pos != string::npos || lastPos != string::npos)
{
// Found a token, add it to the vector.
tokens.push_back(str.substr(lastPos, pos - lastPos));
// Skip delimiters. Note the "not_of"
lastPos = str.find_first_not_of(delimiters, pos);
// Find next "non-delimiter"
pos = str.find_first_of(delimiters, lastPos);
}
}
// Find an executable by name in $PATH.
bool
find_executable(const char *name, string& retpath)
{
const char *p;
string path;
vector<string> dirs;
struct stat st1, st2;
if (*name == '/')
{
retpath = name;
return true;
}
p = getenv("PATH");
if (!p)
return false;
path = p;
// Split PATH up.
tokenize(path, dirs, string(":"));
// Search the path looking for the first executable of the right name.
for (vector<string>::iterator i = dirs.begin(); i != dirs.end(); i++)
{
string fname = *i + "/" + name;
const char *f = fname.c_str();
// Look for a normal executable file.
if (access(f, X_OK) == 0
&& lstat(f, &st1) == 0
&& stat(f, &st2) == 0
&& S_ISREG(st2.st_mode))
{
// Found it!
retpath = fname;
return true;
}
}
return false;
}
const string cmdstr_quoted(const string& cmd)
{
// original cmd : substr1
// or : substr1'substr2
// or : substr1'substr2'substr3......
// after quoted :
// every substr(even it's empty) is quoted by ''
// every single-quote(') is quoted by ""
// examples: substr1 --> 'substr1'
// substr1'substr2 --> 'substr1'"'"'substr2'
string quoted_cmd;
string quote("'");
string replace("'\"'\"'");
string::size_type pos = 0;
quoted_cmd += quote;
for (string::size_type quote_pos = cmd.find(quote, pos);
quote_pos != string::npos;
quote_pos = cmd.find(quote, pos)) {
quoted_cmd += cmd.substr(pos, quote_pos - pos);
quoted_cmd += replace;
pos = quote_pos + 1;
}
quoted_cmd += cmd.substr(pos, cmd.length() - pos);
quoted_cmd += quote;
return quoted_cmd;
}
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