/*

 * $Id: json_util.c,v 1.4 2006/01/30 23:07:57 mclark Exp $

 *

 * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.

 * Michael Clark <michael@metaparadigm.com>

 *

 * This library is free software; you can redistribute it and/or modify

 * it under the terms of the MIT license. See COPYING for details.

 *

 */

#include "config.h"

#undef realloc

#include "strerror_override.h"

#include <stdarg.h>

#include <stdio.h>

#include <stdlib.h>

#include <stddef.h>

#include <limits.h>

#include <string.h>

#include <ctype.h>

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif /* HAVE_SYS_TYPES_H */

#ifdef HAVE_SYS_STAT_H

#include <sys/stat.h>

#endif /* HAVE_SYS_STAT_H */

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#endif /* HAVE_FCNTL_H */

#ifdef HAVE_UNISTD_H

# include <unistd.h>

#endif /* HAVE_UNISTD_H */

#ifdef WIN32

# if MSC_VER < 1800

/* strtoll is available only since Visual Studio 2013 */

#  define strtoll _strtoi64

# endif

# define WIN32_LEAN_AND_MEAN

# include <windows.h>

# include <io.h>

#endif /* defined(WIN32) */

#if !defined(HAVE_OPEN) && defined(WIN32)

# define open _open

#endif

#include "snprintf_compat.h"

#include "debug.h"

#include "printbuf.h"

#include "json_inttypes.h"

#include "json_object.h"

#include "json_tokener.h"

#include "json_util.h"

static int _json_object_to_fd(int fd, struct json_object *obj, int flags, const char *filename);

static char _last_err[256] = "";

const char *json_util_get_last_err()

{

	if (_last_err[0] == '\0')

		return NULL;

	return _last_err;

}

void _json_c_set_last_err(const char *err_fmt, ...)

{

	va_list ap;

	va_start(ap, err_fmt);

	// Ignore (attempted) overruns from snprintf

	(void)vsnprintf(_last_err, sizeof(_last_err), err_fmt, ap);

	va_end(ap);

}

struct json_object* json_object_from_fd(int fd)

{

  struct printbuf *pb;

  struct json_object *obj;

  char buf[JSON_FILE_BUF_SIZE];

  int ret;

  if(!(pb = printbuf_new())) {

    _json_c_set_last_err("json_object_from_file: printbuf_new failed\n");

    return NULL;

  }

  while((ret = read(fd, buf, JSON_FILE_BUF_SIZE)) > 0) {

    printbuf_memappend(pb, buf, ret);

  }

  if(ret < 0) {

    _json_c_set_last_err("json_object_from_fd: error reading fd %d: %s\n", fd, strerror(errno));

    printbuf_free(pb);

    return NULL;

  }

  obj = json_tokener_parse(pb->buf);

  printbuf_free(pb);

  return obj;

}

struct json_object* json_object_from_file(const char *filename)

{

  struct json_object *obj;

  int fd;

  if((fd = open(filename, O_RDONLY)) < 0) {

    _json_c_set_last_err("json_object_from_file: error opening file %s: %s\n",

	     filename, strerror(errno));

    return NULL;

  }

  obj = json_object_from_fd(fd);

  close(fd);

  return obj;

}

/* extended "format and write to file" function */

int json_object_to_file_ext(const char *filename, struct json_object *obj, int flags)

{

	int fd, ret;

	int saved_errno;

	if (!obj) {

		_json_c_set_last_err("json_object_to_file: object is null\n");

		return -1;

	}

	if ((fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT, 0644)) < 0) {

		_json_c_set_last_err("json_object_to_file: error opening file %s: %s\n",

		              filename, strerror(errno));

		return -1;

	}

	ret = _json_object_to_fd(fd, obj, flags, filename);

	saved_errno = errno;

	close(fd);

	errno = saved_errno;

	return ret;

}

int json_object_to_fd(int fd, struct json_object *obj, int flags)

{

	if (!obj) {

		_json_c_set_last_err("json_object_to_fd: object is null\n");

		return -1;

	}

	return _json_object_to_fd(fd, obj, flags, NULL);

}

static int _json_object_to_fd(int fd, struct json_object *obj, int flags, const char *filename)

{

	int ret;

	const char *json_str;

	unsigned int wpos, wsize;

	filename = filename ? filename : "(fd)";

	if (!(json_str = json_object_to_json_string_ext(obj,flags))) {

		return -1;

	}

	wsize = (unsigned int)(strlen(json_str) & UINT_MAX); /* CAW: probably unnecessary, but the most 64bit safe */

	wpos = 0;

	while(wpos < wsize) {

		if((ret = write(fd, json_str + wpos, wsize-wpos)) < 0) {

		  _json_c_set_last_err("json_object_to_file: error writing file %s: %s\n",

			 filename, strerror(errno));

		  return -1;

		}

		/* because of the above check for ret < 0, we can safely cast and add */

		wpos += (unsigned int)ret;

	}

	return 0;

}

// backwards compatible "format and write to file" function

int json_object_to_file(const char *filename, struct json_object *obj)

{

  return json_object_to_file_ext(filename, obj, JSON_C_TO_STRING_PLAIN);

}

int json_parse_double(const char *buf, double *retval)

{

  char *end;

  *retval = strtod(buf, &end;;

  return end == buf ? 1 : 0;

}

int json_parse_int64(const char *buf, int64_t *retval)

{

	char *end = NULL;

	int64_t val;

	errno = 0;

	val = strtoll(buf, &end, 10);

	if (end != buf)

		*retval = val;

	return ((val == 0 && errno != 0) || (end == buf)) ? 1 : 0;

}

#ifndef HAVE_REALLOC

void* rpl_realloc(void* p, size_t n)

{

	if (n == 0)

		n = 1;

	if (p == 0)

		return malloc(n);

	return realloc(p, n);

}

#endif

#define NELEM(a)        (sizeof(a) / sizeof(a[0]))

static const char* json_type_name[] = {

  /* If you change this, be sure to update the enum json_type definition too */

  "null",

  "boolean",

  "double",

  "int",

  "object",

  "array",

  "string",

};

const char *json_type_to_name(enum json_type o_type)

{

	int o_type_int = (int)o_type;

	if (o_type_int < 0 || o_type_int >= (int)NELEM(json_type_name))

	{

		_json_c_set_last_err("json_type_to_name: type %d is out of range [0,%d]\n", o_type, NELEM(json_type_name));

		return NULL;

	}

	return json_type_name[o_type];

}