archive_check_magic.c [plain text]
#include "archive_platform.h"
__FBSDID("$FreeBSD: head/lib/libarchive/archive_check_magic.c 201089 2009-12-28 02:20:23Z kientzle $");
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if defined(_WIN32) && !defined(__CYGWIN__)
#include <windows.h>
#include <winbase.h>
#endif
#include "archive_private.h"
static void
errmsg(const char *m)
{
size_t s = strlen(m);
ssize_t written;
while (s > 0) {
written = write(2, m, strlen(m));
if (written <= 0)
return;
m += written;
s -= written;
}
}
static void
diediedie(void)
{
#if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG)
DebugBreak();
#endif
abort();
}
static const char *
state_name(unsigned s)
{
switch (s) {
case ARCHIVE_STATE_NEW: return ("new");
case ARCHIVE_STATE_HEADER: return ("header");
case ARCHIVE_STATE_DATA: return ("data");
case ARCHIVE_STATE_EOF: return ("eof");
case ARCHIVE_STATE_CLOSED: return ("closed");
case ARCHIVE_STATE_FATAL: return ("fatal");
default: return ("??");
}
}
static void
write_all_states(unsigned int states)
{
unsigned int lowbit;
while ((lowbit = states & (1 + ~states)) != 0) {
states &= ~lowbit;
errmsg(state_name(lowbit));
if (states != 0)
errmsg("/");
}
}
void
__archive_check_magic(struct archive *a, unsigned int magic,
unsigned int state, const char *function)
{
if (a->magic != magic) {
errmsg("INTERNAL ERROR: Function ");
errmsg(function);
errmsg(" invoked with invalid struct archive structure.\n");
diediedie();
}
if (state == ARCHIVE_STATE_ANY)
return;
if ((a->state & state) == 0) {
errmsg("INTERNAL ERROR: Function '");
errmsg(function);
errmsg("' invoked with archive structure in state '");
write_all_states(a->state);
errmsg("', should be in state '");
write_all_states(state);
errmsg("'\n");
diediedie();
}
}