root/src/json-lib/json_util.c

Revision efa9375336eec306ede14a9a1032985a71482810, 2.8 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 3 years ago)

refs #294 resmon no support arbitrary json objects

  • Property mode set to 100644
Line 
1 /*
2  * $Id: json_util.c,v 1.4 2006/01/30 23:07:57 mclark Exp $
3  *
4  * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
5  * Michael Clark <michael@metaparadigm.com>
6  *
7  * This library is free software; you can redistribute it and/or modify
8  * it under the terms of the MIT license. See COPYING for details.
9  *
10  */
11
12 #include "noit_config.h"
13
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <stddef.h>
17 #include <limits.h>
18 #include <string.h>
19 #include <errno.h>
20
21 #if HAVE_SYS_TYPES_H
22 #include <sys/types.h>
23 #endif /* HAVE_SYS_TYPES_H */
24
25 #if HAVE_SYS_STAT_H
26 #include <sys/stat.h>
27 #endif /* HAVE_SYS_STAT_H */
28
29 #if HAVE_FCNTL_H
30 #include <fcntl.h>
31 #endif /* HAVE_FCNTL_H */
32
33 #if HAVE_UNISTD_H
34 # include <unistd.h>
35 #endif /* HAVE_UNISTD_H */
36
37 #ifdef WIN32
38 # define WIN32_LEAN_AND_MEAN
39 # include <windows.h>
40 # include <io.h>
41 #endif /* defined(WIN32) */
42
43 #if !HAVE_OPEN && defined(WIN32)
44 # define open _open
45 #endif
46
47
48 #include "bits.h"
49 #include "debug.h"
50 #include "printbuf.h"
51 #include "json_object.h"
52 #include "json_tokener.h"
53 #include "json_util.h"
54
55 struct json_object* json_object_from_file(char *filename)
56 {
57   struct printbuf *pb;
58   struct json_object *obj;
59   char buf[JSON_FILE_BUF_SIZE];
60   int fd, ret;
61
62   if((fd = open(filename, O_RDONLY)) < 0) {
63     MC_ERROR("json_object_from_file: error reading file %s: %s\n",
64              filename, strerror(errno));
65     return (struct json_object*)error_ptr(-1);
66   }
67   if(!(pb = printbuf_new())) {
68     MC_ERROR("json_object_from_file: printbuf_new failed\n");
69     return (struct json_object*)error_ptr(-1);
70   }
71   while((ret = read(fd, buf, JSON_FILE_BUF_SIZE)) > 0) {
72     printbuf_memappend(pb, buf, ret);
73   }
74   close(fd);
75   if(ret < 0) {
76     MC_ABORT("json_object_from_file: error reading file %s: %s\n",
77              filename, strerror(errno));
78     printbuf_free(pb);
79     return (struct json_object*)error_ptr(-1);
80   }
81   obj = json_tokener_parse(pb->buf);
82   printbuf_free(pb);
83   return obj;
84 }
85
86 int json_object_to_file(char *filename, struct json_object *obj)
87 {
88   const char *json_str;
89   int fd, ret;
90   unsigned int wpos, wsize;
91
92   if(!obj) {
93     MC_ERROR("json_object_to_file: object is null\n");
94     return -1;
95   }
96
97   if((fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT, 0644)) < 0) {
98     MC_ERROR("json_object_to_file: error opening file %s: %s\n",
99              filename, strerror(errno));
100     return -1;
101   }
102
103   if(!(json_str = json_object_to_json_string(obj))) { return -1; }
104
105
106   wsize = (unsigned int)(strlen(json_str) & UINT_MAX); /* CAW: probably unnecessary, but the most 64bit safe */
107   wpos = 0;
108   while(wpos < wsize) {
109     if((ret = write(fd, json_str + wpos, wsize-wpos)) < 0) {
110       close(fd);
111       MC_ERROR("json_object_to_file: error writing file %s: %s\n",
112              filename, strerror(errno));
113       return -1;
114     }
115
116         /* because of the above check for ret < 0, we can safely cast and add */
117     wpos += (unsigned int)ret;
118   }
119
120   close(fd);
121   return 0;
122 }
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