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// this is a somewhat more portable mkstemp which uses the system prng to
// seed. from what I've seen on other system mkstemps, they are usually
// *worse* than this (or non-existant).
//
// the source is partially cribbed from gfileutils.c in glib, which is
// copyright (c) 2000 Red Hat. It was released as LGPL, so I have copied
// some of its text into this file and am relicensing my derivative work
// (this file) copyright (C) 2004 graydon hoare, as LGPL also.
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include "botan/botan.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
using std::string;
bool
monotone_mkstemp(string &tmpl)
{
unsigned int len = 0;
int i = 0;
int count = 0, fd = -1;
string tmp;
static const char letters[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
static const int NLETTERS = sizeof (letters) - 1;
len = tmpl.length();
if (len < 6 || tmpl.rfind("XXXXXX") != len-6)
return -1;
for (count = 0; count < 100; ++count)
{
tmp = tmpl.substr(0, len-6);
for (i = 0; i < 6; ++i)
tmp.append(1, letters[Botan::Global_RNG::random(Botan::Nonce) % NLETTERS]);
#ifdef _MSC_VER
fd = _open(tmp.c_str(), _O_RDWR | _O_CREAT | _O_EXCL | _O_BINARY, 0600);
#else
fd = open(tmp.c_str(), O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0600);
#endif
if (fd >= 0)
{
tmpl = tmp;
#ifdef _MSC_VER
_close(fd);
#else
close(fd);
#endif
return true;
}
else if (errno != EEXIST)
break;
}
return false;
}
// Local Variables:
// mode: C++
// fill-column: 76
// c-file-style: "gnu"
// indent-tabs-mode: nil
// End:
// vim: et:sw=2:sts=2:ts=2:cino=>2s,{s,\:s,+s,t0,g0,^-2,e-2,n-2,p2s,(0,=s:
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