/*
 * Copyright (C) the libgit2 contributors. All rights reserved.
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */
#ifndef INCLUDE_common_h__
#define INCLUDE_common_h__
#include "git2/common.h"
#include "cc-compat.h"
/** Declare a function as always inlined. */
#if defined(_MSC_VER)
# define GIT_INLINE(type) static __inline type
#else
# define GIT_INLINE(type) static inline type
#endif
/** Support for gcc/clang __has_builtin intrinsic */
#ifndef __has_builtin
# define __has_builtin(x) 0
#endif
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef GIT_WIN32
# include <io.h>
# include <direct.h>
# include <winsock2.h>
# include <windows.h>
# include <ws2tcpip.h>
# include "win32/msvc-compat.h"
# include "win32/mingw-compat.h"
# include "win32/error.h"
# include "win32/version.h"
# ifdef GIT_THREADS
#       include "win32/pthread.h"
# endif
# if defined(GIT_MSVC_CRTDBG)
#   include "win32/w32_stack.h"
#   include "win32/w32_crtdbg_stacktrace.h"
# endif
#else
# include <unistd.h>
# include <strings.h>
# ifdef GIT_THREADS
#       include <pthread.h>
#       include <sched.h>
# endif
#define GIT_STDLIB_CALL
# include <arpa/inet.h>
#endif
#include "git2/types.h"
#include "git2/errors.h"
#include "thread-utils.h"
#include "integer.h"
#include <regex.h>
#define DEFAULT_BUFSIZE 65536
#define FILEIO_BUFSIZE DEFAULT_BUFSIZE
#define FILTERIO_BUFSIZE DEFAULT_BUFSIZE
#define NETIO_BUFSIZE DEFAULT_BUFSIZE
/**
 * Check a pointer allocation result, returning -1 if it failed.
 */
#define GITERR_CHECK_ALLOC(ptr) if (ptr == NULL) { return -1; }
/**
 * Check a return value and propagate result if non-zero.
 */
#define GITERR_CHECK_ERROR(code) \
        do { int _err = (code); if (_err) return _err; } while (0)
/**
 * Set the error message for this thread, formatting as needed.
 */
void giterr_set(int error_class, const char *string, ...);
/**
 * Set the error message for a regex failure, using the internal regex
 * error code lookup and return a libgit error code.
 */
int giterr_set_regex(const regex_t *regex, int error_code);
/**
 * Set error message for user callback if needed.
 *
 * If the error code in non-zero and no error message is set, this
 * sets a generic error message.
 *
 * @return This always returns the `error_code` parameter.
 */
GIT_INLINE(int) giterr_set_after_callback_function(
        int error_code, const char *action)
{
        if (error_code) {
                const git_error *e = giterr_last();
                if (!e || !e->message)
                        giterr_set(e ? e->klass : GITERR_CALLBACK,
                                "%s callback returned %d", action, error_code);
        }
        return error_code;
}
#ifdef GIT_WIN32
#define giterr_set_after_callback(code) \
        giterr_set_after_callback_function((code), __FUNCTION__)
#else
#define giterr_set_after_callback(code) \
        giterr_set_after_callback_function((code), __func__)
#endif
/**
 * Gets the system error code for this thread.
 */
int giterr_system_last(void);
/**
 * Sets the system error code for this thread.
 */
void giterr_system_set(int code);
/**
 * Structure to preserve libgit2 error state
 */
typedef struct {
        int error_code;
        unsigned int oom : 1;
        git_error error_msg;
} git_error_state;
/**
 * Capture current error state to restore later, returning error code.
 * If `error_code` is zero, this does not clear the current error state.
 * You must either restore this error state, or free it.
 */
extern int giterr_state_capture(git_error_state *state, int error_code);
/**
 * Restore error state to a previous value, returning saved error code.
 */
extern int giterr_state_restore(git_error_state *state);
/** Free an error state. */
extern void giterr_state_free(git_error_state *state);
/**
 * Check a versioned structure for validity
 */
GIT_INLINE(int) giterr__check_version(const void *structure, unsigned int expected_max, const char *name)
{
        unsigned int actual;
        if (!structure)
                return 0;
        actual = *(const unsigned int*)structure;
        if (actual > 0 && actual <= expected_max)
                return 0;
        giterr_set(GITERR_INVALID, "Invalid version %d on %s", actual, name);
        return -1;
}
#define GITERR_CHECK_VERSION(S,V,N) if (giterr__check_version(S,V,N) < 0) return -1
/**
 * Initialize a structure with a version.
 */
GIT_INLINE(void) git__init_structure(void *structure, size_t len, unsigned int version)
{
        memset(structure, 0, len);
        *((int*)structure) = version;
}
#define GIT_INIT_STRUCTURE(S,V) git__init_structure(S, sizeof(*S), V)
#define GIT_INIT_STRUCTURE_FROM_TEMPLATE(PTR,VERSION,TYPE,TPL) do { \
        TYPE _tmpl = TPL; \
        GITERR_CHECK_VERSION(&(VERSION), _tmpl.version, #TYPE);     \
        memcpy((PTR), &_tmpl, sizeof(_tmpl)); } while (0)
/** Check for additive overflow, setting an error if would occur. */
#define GIT_ADD_SIZET_OVERFLOW(out, one, two) \
        (git__add_sizet_overflow(out, one, two) ? (giterr_set_oom(), 1) : 0)
/** Check for additive overflow, setting an error if would occur. */
#define GIT_MULTIPLY_SIZET_OVERFLOW(out, nelem, elsize) \
        (git__multiply_sizet_overflow(out, nelem, elsize) ? (giterr_set_oom(), 1) : 0)
/** Check for additive overflow, failing if it would occur. */
#define GITERR_CHECK_ALLOC_ADD(out, one, two) \
        if (GIT_ADD_SIZET_OVERFLOW(out, one, two)) { return -1; }
#define GITERR_CHECK_ALLOC_ADD3(out, one, two, three) \
        if (GIT_ADD_SIZET_OVERFLOW(out, one, two) || \
                GIT_ADD_SIZET_OVERFLOW(out, *(out), three)) { return -1; }
#define GITERR_CHECK_ALLOC_ADD4(out, one, two, three, four) \
        if (GIT_ADD_SIZET_OVERFLOW(out, one, two) || \
                GIT_ADD_SIZET_OVERFLOW(out, *(out), three) || \
                GIT_ADD_SIZET_OVERFLOW(out, *(out), four)) { return -1; }
/** Check for multiplicative overflow, failing if it would occur. */
#define GITERR_CHECK_ALLOC_MULTIPLY(out, nelem, elsize) \
        if (GIT_MULTIPLY_SIZET_OVERFLOW(out, nelem, elsize)) { return -1; }
/* NOTE: other giterr functions are in the public errors.h header file */
#include "util.h"
#endif /* INCLUDE_common_h__ */