chiark / gitweb /
glib: Update gtimezone.c patch after review
[termux-packages] / packages / glib / glib-gtimezone.c.patch
1 Patch submitted at https://bugzilla.gnome.org/show_bug.cgi?id=771304
2
3 diff -u -r ../glib-2.54.2/glib/gtimezone.c ./glib/gtimezone.c
4 --- ../glib-2.54.2/glib/gtimezone.c     2017-07-14 01:03:39.000000000 +0200
5 +++ ./glib/gtimezone.c  2017-12-09 02:03:46.797229494 +0100
6 @@ -43,6 +43,14 @@
7  #include <windows.h>
8  #endif
9  
10 +#ifdef __ANDROID__
11 +#include <arpa/inet.h>
12 +#include <errno.h>
13 +#include <fcntl.h>
14 +#include <sys/system_properties.h>
15 +#include <unistd.h>
16 +#endif
17 +
18  /**
19   * SECTION:timezone
20   * @title: GTimeZone
21 @@ -392,7 +399,116 @@
22    gtz->transitions = NULL;
23  }
24  
25 -#ifdef G_OS_UNIX
26 +#ifdef __ANDROID__
27 +/* Android uses a 'persist.sys.timezone' system property for the
28 +   current timezone instead of a /etc/localtime file:
29 +   https://android.googlesource.com/platform/ndk/+/android-2.2_r1/docs/system/libc/OVERVIEW.TXT#67
30 +
31 +   There are no files under /usr/share/zoneinfo - instead a single
32 +   /system/usr/share/zoneinfo/tzdata file is used which contains all
33 +   files compiled together with the following tool:
34 +   https://android.googlesource.com/platform/system/timezone/+/master/zone_compactor/main/java/ZoneCompactor.java */
35 +static GBytes*
36 +zone_info_android (const gchar *identifier)
37 +{
38 +  struct tzdata_header
39 +  {
40 +    char     version[12];
41 +    uint32_t index_offset;
42 +    uint32_t data_offset;
43 +    uint32_t zonetab_offset;
44 +  } __attribute__((packed)) header;
45 +
46 +  struct tzdata_index_entry
47 +  {
48 +    char     name[40];
49 +    uint32_t offset;
50 +    uint32_t length;
51 +    uint32_t unused;
52 +  } __attribute__((packed)) entry;
53 +
54 +  char sys_timezone[PROP_VALUE_MAX];
55 +  int tzdata_fd;
56 +
57 +  if (identifier == NULL)
58 +    {
59 +      if (__system_property_get ("persist.sys.timezone", sys_timezone) < 1)
60 +      {
61 +        g_warning ("__system_property_get(\"persist.sys.timezone\") failed");
62 +        return NULL;
63 +      }
64 +      identifier = sys_timezone;
65 +    }
66 +
67 +  tzdata_fd = TEMP_FAILURE_RETRY(open ("/system/usr/share/zoneinfo/tzdata", O_RDONLY));
68 +  if (tzdata_fd < 0)
69 +  {
70 +    g_warning ("Failed opening tzdata");
71 +    return NULL;
72 +  }
73 +
74 +  if (TEMP_FAILURE_RETRY(read (tzdata_fd, &header, sizeof(header)) < (ssize_t) sizeof (header)))
75 +  {
76 +    g_warning ("Failed reading tzdata header");
77 +    goto error;
78 +  }
79 +
80 +  header.index_offset = htonl (header.index_offset);
81 +  header.data_offset = htonl (header.data_offset);
82 +
83 +  uint32_t current_offset = header.index_offset;
84 +  while (current_offset < header.data_offset)
85 +    {
86 +      if (TEMP_FAILURE_RETRY(read (tzdata_fd, &entry, sizeof(entry)) < (ssize_t) sizeof (entry)))
87 +      {
88 +        g_warning ("Failed reading tzdata index entry");
89 +        goto error;
90 +      }
91 +
92 +      if (strcmp (entry.name, identifier) == 0)
93 +        {
94 +          entry.offset = htonl (entry.offset);
95 +          entry.length = htonl (entry.length);
96 +          if (entry.length == 0)
97 +            {
98 +              g_warning ("Invalid tzdata entry with length zero");
99 +              goto error;
100 +            }
101 +
102 +          if (TEMP_FAILURE_RETRY(lseek (tzdata_fd, header.data_offset + entry.offset, SEEK_SET) == -1))
103 +            {
104 +              g_warning ("Failed seeking to tzdata entry");
105 +              goto error;
106 +            }
107 +
108 +          /* Use a reasonable but arbitrary max length of an entry. */
109 +          if (entry.length > 65536)
110 +            {
111 +              g_warning ("Too large tzdata entry length");
112 +              goto error;
113 +            }
114 +
115 +          guint8* data = g_malloc (entry.length);
116 +          if (TEMP_FAILURE_RETRY(read (tzdata_fd, data, entry.length) < entry.length))
117 +            {
118 +              g_warning ("Failed reading tzdata entry");
119 +              g_free (data);
120 +              goto error;
121 +            }
122 +
123 +          close (tzdata_fd);
124 +          return g_bytes_new_take (data, entry.length);
125 +        }
126 +    }
127 +
128 +error:
129 +  close (tzdata_fd);
130 +
131 +  return NULL;
132 +}
133 +
134 +#elif defined(G_OS_UNIX)
135 +
136  static GBytes*
137  zone_info_unix (const gchar *identifier)
138  {
139 @@ -436,6 +541,10 @@
140    return zoneinfo;
141  }
142  
143 +#endif
144 +
145 +#ifdef G_OS_UNIX
146 +
147  static void
148  init_zone_from_iana_info (GTimeZone *gtz, GBytes *zoneinfo)
149  {
150 @@ -1387,7 +1496,11 @@
151    if (tz->t_info == NULL)
152      {
153  #ifdef G_OS_UNIX
154 +# ifdef __ANDROID__
155 +      GBytes *zoneinfo = zone_info_android (identifier);
156 +# else
157        GBytes *zoneinfo = zone_info_unix (identifier);
158 +# endif
159        if (!zoneinfo)
160          zone_for_constant_offset (tz, "UTC");
161        else