2013-02-08 09:35:17 -08:00
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//Compile with:
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// gcc -o eet-data-simple eet-data-simple.c `pkg-config --cflags --libs eet eina`
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2012-09-17 09:35:38 -07:00
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#include <Eina.h>
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#include <Eet.h>
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#include <stdio.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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// The struct that will be loaded and saved.
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// note that only the members described in the eet_data_descriptor
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// will be automatically handled. The other members will have their
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// space reserved and zeroed (as it uses calloc()), but not
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// saved or loaded from eet files.
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typedef struct
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{
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unsigned int version; // it is recommended to use versioned configuration!
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const char *name;
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int id;
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int not_saved_value; // example of not saved data inside!
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Eina_Bool enabled;
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} My_Conf_Type;
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// string that represents the entry in eet file, you might like to have
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// different profiles or so in the same file, this is possible with
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// different strings
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static const char MY_CONF_FILE_ENTRY[] = "config";
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// keep the descriptor static global, so it can be
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// shared by different functions (load/save) of this and only this
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// file.
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static Eet_Data_Descriptor *_my_conf_descriptor;
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static void
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_my_conf_descriptor_init(void)
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{
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Eet_Data_Descriptor_Class eddc;
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// The class describe the functions to use to create the type and its
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// full allocated size.
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//
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// Eina types are very convenient, so use them to create the descriptor,
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// so we get eina_list, eina_hash and eina_stringshare automatically!
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//
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// The STREAM variant is better for configuration files as the values
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// will likely change a lot.
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//
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// The other variant, FILE, is good for caches and things that are just
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// appended, but needs to take care when changing strings and files must
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// be kept open so mmap()ed strings will be kept alive.
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EET_EINA_STREAM_DATA_DESCRIPTOR_CLASS_SET(&eddc, My_Conf_Type);
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_my_conf_descriptor = eet_data_descriptor_stream_new(&eddc);
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// Describe the members to be saved:
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// Use a temporary macro so we don't type a lot, also avoid errors:
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#define MY_CONF_ADD_BASIC(member, eet_type) \
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EET_DATA_DESCRIPTOR_ADD_BASIC \
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(_my_conf_descriptor, My_Conf_Type, # member, member, eet_type)
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MY_CONF_ADD_BASIC(version, EET_T_UINT);
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MY_CONF_ADD_BASIC(name, EET_T_STRING);
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MY_CONF_ADD_BASIC(id, EET_T_INT);
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MY_CONF_ADD_BASIC(enabled, EET_T_UCHAR);
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#undef MY_CONF_ADD_BASIC
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} /* _my_conf_descriptor_init */
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static void
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_my_conf_descriptor_shutdown(void)
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{
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eet_data_descriptor_free(_my_conf_descriptor);
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} /* _my_conf_descriptor_shutdown */
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static My_Conf_Type *
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_my_conf_new(void)
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{
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My_Conf_Type *my_conf = calloc(1, sizeof(My_Conf_Type));
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if (!my_conf)
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{
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fprintf(stderr, "ERROR: could not calloc My_Conf_Type\n");
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return NULL;
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}
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my_conf->version = 0x112233;
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my_conf->enabled = EINA_TRUE;
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return my_conf;
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} /* _my_conf_new */
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static void
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_my_conf_free(My_Conf_Type *my_conf)
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{
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eina_stringshare_del(my_conf->name);
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free(my_conf);
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} /* _my_conf_free */
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static My_Conf_Type *
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_my_conf_load(const char *filename)
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{
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My_Conf_Type *my_conf;
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Eet_File *ef = eet_open(filename, EET_FILE_MODE_READ);
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if (!ef)
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{
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fprintf(stderr, "ERROR: could not open '%s' for read\n", filename);
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return NULL;
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}
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my_conf = eet_data_read(ef, _my_conf_descriptor, MY_CONF_FILE_ENTRY);
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if (!my_conf)
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goto end;
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if (my_conf->version < 0x112233)
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{
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fprintf(stderr,
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"WARNING: version %#x was too old, upgrading it to %#x\n",
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my_conf->version, 0x112233);
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my_conf->version = 0x112233;
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my_conf->enabled = EINA_TRUE;
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}
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end:
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eet_close(ef);
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return my_conf;
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} /* _my_conf_load */
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static Eina_Bool
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_my_conf_save(const My_Conf_Type *my_conf,
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const char *filename)
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{
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char tmp[PATH_MAX];
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Eet_File *ef;
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Eina_Bool ret;
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unsigned int i, len;
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struct stat st;
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len = eina_strlcpy(tmp, filename, sizeof(tmp));
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if (len + 12 >= (int)sizeof(tmp))
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{
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fprintf(stderr, "ERROR: file name is too big: %s\n", filename);
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return EINA_FALSE;
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}
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i = 0;
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do
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{
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snprintf(tmp + len, 12, ".%u", i);
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i++;
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}
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while (stat(tmp, &st) == 0);
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ef = eet_open(tmp, EET_FILE_MODE_WRITE);
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if (!ef)
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{
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fprintf(stderr, "ERROR: could not open '%s' for write\n", tmp);
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return EINA_FALSE;
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}
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ret = eet_data_write
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(ef, _my_conf_descriptor, MY_CONF_FILE_ENTRY, my_conf, EINA_TRUE);
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eet_close(ef);
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if (ret)
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{
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unlink(filename);
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rename(tmp, filename);
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}
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return ret;
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} /* _my_conf_save */
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int
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main(int argc,
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char *argv[])
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{
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My_Conf_Type *my_conf;
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int ret = 0;
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if (argc != 3)
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{
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fprintf(stderr, "Usage:\n\t%s <input> <output>\n\n", argv[0]);
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return -1;
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}
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eina_init();
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eet_init();
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_my_conf_descriptor_init();
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my_conf = _my_conf_load(argv[1]);
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if (!my_conf)
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{
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printf("creating new configuration.\n");
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my_conf = _my_conf_new();
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if (!my_conf)
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{
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ret = -2;
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goto end;
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}
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}
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printf("My_Conf_Type:\n"
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"\tversion: %#x\n"
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"\tname...: '%s'\n"
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"\tid.....: %d\n"
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"\tenabled: %hhu\n",
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my_conf->version,
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my_conf->name ? my_conf->name : "",
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my_conf->id,
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my_conf->enabled);
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if (!_my_conf_save(my_conf, argv[2]))
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ret = -3;
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_my_conf_free(my_conf);
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end:
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_my_conf_descriptor_shutdown();
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eet_shutdown();
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eina_shutdown();
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return ret;
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} /* main */
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