json_util.cpp
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上传日期:2018-10-23
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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"
- #include <stdio.h>
- #include <stdlib.h>
- #include <stddef.h>
- #include <limits.h>
- #include <string.h>
- #include <errno.h>
- #if HAVE_SYS_TYPES_H
- #include <sys/types.h>
- #endif /* HAVE_SYS_TYPES_H */
- #if HAVE_SYS_STAT_H
- #include <sys/stat.h>
- #endif /* HAVE_SYS_STAT_H */
- #if HAVE_FCNTL_H
- #include <fcntl.h>
- #endif /* HAVE_FCNTL_H */
- #if HAVE_UNISTD_H
- # include <unistd.h>
- #endif /* HAVE_UNISTD_H */
- #ifdef WIN32
- # define WIN32_LEAN_AND_MEAN
- # include <windows.h>
- # include <io.h>
- #endif /* defined(WIN32) */
- #if !HAVE_OPEN && defined(WIN32)
- # define open _open
- #endif
- #include "bits.h"
- #include "debug.h"
- #include "printbuf.h"
- #include "json_object.h"
- #include "json_tokener.h"
- #include "json_util.h"
- struct json_object* json_object_from_file(char *filename)
- {
- struct printbuf *pb;
- struct json_object *obj;
- char buf[JSON_FILE_BUF_SIZE];
- int fd, ret;
- if((fd = open(filename, O_RDONLY)) < 0) {
- MC_ERROR("json_object_from_file: error reading file %s: %sn",
- filename, strerror(errno));
- return (struct json_object *)error_ptr(-1);
- }
- if(!(pb = printbuf_new())) {
- MC_ERROR("json_object_from_file: printbuf_new failedn");
- return (struct json_object *)error_ptr(-1);
- }
- while((ret = read(fd, buf, JSON_FILE_BUF_SIZE)) > 0) {
- printbuf_memappend(pb, buf, ret);
- }
- close(fd);
- if(ret < 0) {
- MC_ABORT("json_object_from_file: error reading file %s: %sn",
- filename, strerror(errno));
- printbuf_free(pb);
- return (struct json_object *)error_ptr(-1);
- }
- obj = json_tokener_parse(pb->buf);
- printbuf_free(pb);
- return obj;
- }
- int json_object_to_file(char *filename, struct json_object *obj)
- {
- char *json_str;
- int fd, ret;
- unsigned int wpos, wsize;
- if(!obj) {
- MC_ERROR("json_object_to_file: object is nulln");
- return -1;
- }
- if((fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT, 0644)) < 0) {
- MC_ERROR("json_object_to_file: error opening file %s: %sn",
- filename, strerror(errno));
- return -1;
- }
- if(!(json_str = json_object_to_json_string(obj))) { 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) {
- close(fd);
- MC_ERROR("json_object_to_file: error writing file %s: %sn",
- filename, strerror(errno));
- return -1;
- }
- /* because of the above check for ret < 0, we can safely cast and add */
- wpos += (unsigned int)ret;
- }
- close(fd);
- return 0;
- }