clamav/libclammspack/mspack/system.h

/* This file is part of libmspack.
 * (C) 2003-2018 Stuart Caie.
 *
 * libmspack is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License (LGPL) version 2.1
 *
 * For further details, see the file COPYING.LIB distributed with libmspack
 */

#ifndef MSPACK_SYSTEM_H
#define MSPACK_SYSTEM_H 1

#ifdef __cplusplus
extern "C" {
#endif

/* ensure config.h is read before mspack.h */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <mspack.h>
#include <macros.h>

/* assume <string.h> exists */
#ifndef MSPACK_NO_DEFAULT_SYSTEM
# include <string.h>
#else
 /* but if no default system wanted, avoid using <string.h> entirely,
  * to avoid linking to even these standard C library functions */
static inline int memcmp(const void *s1, const void *s2, size_t n) {
    const unsigned char *a = s1, *b = s2;
    while (n--) if (*a++ != *b++) return a[-1] - b[-1];
    return 0;
}
static inline void *memset(void *s, int c, size_t n) {
    unsigned char *s2 = s, c2 = (unsigned char) c;
    while (n--) *s2++ = c2;
    return s;
}
static inline size_t strlen(const char *s) {
    size_t c = 0; while (*s++) c++; return c;
}
#endif

/* fix for problem with GCC 4 and glibc (thanks to Ville Skytta)
 * http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=150429
 */
#ifdef read
# undef read
#endif

extern struct mspack_system *mspack_default_system;

/* returns the length of a file opened for reading */
extern int mspack_sys_filelen(struct mspack_system *system,
                              struct mspack_file *file, off_t *length);

/* validates a system structure */
extern int mspack_valid_system(struct mspack_system *sys);

#ifdef __cplusplus
}
#endif

#endif