json_util.c - mozsearch

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/*

 * $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 <limits.h>

#include <stdarg.h>

#include <stddef.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.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

#define WIN32_LEAN_AND_MEAN

#include <io.h>

#include <windows.h>

#endif /* defined(WIN32) */

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

#define open _open

#endif

#include "snprintf_compat.h"

#include "debug.h"

#include "json_inttypes.h"

#include "json_object.h"

#include "json_tokener.h"

#include "json_util.h"

#include "printbuf.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(void)

	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)

	return json_object_from_fd_ex(fd, -1);

struct json_object *json_object_from_fd_ex(int fd, int in_depth)

	struct printbuf *pb;

	struct json_object *obj;

	char buf[JSON_FILE_BUF_SIZE];

	ssize_t ret;

	int depth = JSON_TOKENER_DEFAULT_DEPTH;

	json_tokener *tok;

	if (!(pb = printbuf_new()))

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

		return NULL;

	if (in_depth != -1)

		depth = in_depth;

	tok = json_tokener_new_ex(depth);

	if (!tok)

		_json_c_set_last_err(

		    "json_object_from_fd_ex: unable to allocate json_tokener(depth=%d): %s\n",

		    depth, strerror(errno));

		printbuf_free(pb);

		return NULL;

	while ((ret = read(fd, buf, sizeof(buf))) > 0)

		if (printbuf_memappend(pb, buf, ret) < 0)

#if JSON_FILE_BUF_SIZE > INT_MAX

#error "Can't append more than INT_MAX bytes at a time"

#endif

			_json_c_set_last_err(

		    	"json_object_from_fd_ex: failed to printbuf_memappend after reading %d+%d bytes: %s", printbuf_length(pb), (int)ret, strerror(errno));

			json_tokener_free(tok);

			printbuf_free(pb);

			return NULL;

	if (ret < 0)

		_json_c_set_last_err("json_object_from_fd_ex: error reading fd %d: %s\n", fd,

		                     strerror(errno));

		json_tokener_free(tok);

		printbuf_free(pb);

		return NULL;

	obj = json_tokener_parse_ex(tok, pb->buf, printbuf_length(pb));

	if (obj == NULL)

		_json_c_set_last_err("json_tokener_parse_ex failed: %s\n",

		                     json_tokener_error_desc(json_tokener_get_error(tok)));

	json_tokener_free(tok);

	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_ext: 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_ext: 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)

	ssize_t ret;

	const char *json_str;

	size_t wpos, wsize;

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

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

		return -1;

	wsize = strlen(json_str);

	wpos = 0;

	while (wpos < wsize)

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

			_json_c_set_last_err("json_object_to_fd: 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 += (size_t)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);

// Deprecated json_parse_double function.  See json_tokener_parse_double instead.

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;

	if ((val == 0 && errno != 0) || (end == buf))

		errno = EINVAL;

		return 1;

	return 0;

int json_parse_uint64(const char *buf, uint64_t *retval)

	char *end = NULL;

	uint64_t val;

	errno = 0;

	while (*buf == ' ')

		buf++;

	if (*buf == '-')

		return 1; /* error: uint cannot be negative */

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

	if (end != buf)

		*retval = val;

	if ((val == 0 && errno != 0) || (end == buf))

		errno = EINVAL;

		return 1;

	return 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]))

/* clang-format off */

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",

};

/* clang-format on */

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,%u]\n", o_type,

		                     (unsigned)NELEM(json_type_name));

		return NULL;

	return json_type_name[o_type];