src/core/data.c

   1 /*
   2  * SysDB - src/core/data.c
   3  * Copyright (C) 2014 Sebastian 'tokkee' Harl <sh@tokkee.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "core/data.h"
  29
  30 #include <inttypes.h>
  31
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 /*
  36  * public API
  37  */
  38
  39 int
  40 sdb_data_copy(sdb_data_t *dst, const sdb_data_t *src)
  41 {
  42         sdb_data_t tmp;
  43
  44         if ((! dst) || (! src))
  45                 return -1;
  46
  47         tmp = *src;
  48         switch (src->type) {
  49                 case SDB_TYPE_STRING:
  50                         tmp.data.string = strdup(src->data.string);
  51                         if (! tmp.data.string)
  52                                 return -1;
  53                         break;
  54                 case SDB_TYPE_BINARY:
  55                         tmp.data.binary.datum = malloc(src->data.binary.length);
  56                         if (! tmp.data.binary.datum)
  57                                 return -1;
  58                         memcpy(tmp.data.binary.datum, src->data.binary.datum,
  59                                         src->data.binary.length);
  60                         break;
  61         }
  62
  63         *dst = tmp;
  64         return 0;
  65 } /* sdb_data_copy */
  66
  67 void
  68 sdb_data_free_datum(sdb_data_t *datum)
  69 {
  70         if (! datum)
  71                 return;
  72
  73         switch (datum->type) {
  74                 case SDB_TYPE_STRING:
  75                         if (datum->data.string)
  76                                 free(datum->data.string);
  77                         datum->data.string = NULL;
  78                         break;
  79                 case SDB_TYPE_BINARY:
  80                         if (datum->data.binary.datum)
  81                                 free(datum->data.binary.datum);
  82                         datum->data.binary.datum = NULL;
  83                         datum->data.binary.length = 0;
  84                         break;
  85         }
  86 } /* sdb_data_free_datum */
  87
  88 size_t
  89 sdb_data_strlen(sdb_data_t *datum)
  90 {
  91         if (! datum)
  92                 return 0;
  93
  94         switch (datum->type) {
  95                 case SDB_TYPE_INTEGER:
  96                         /* log(64) */
  97                         return 20;
  98                 case SDB_TYPE_DECIMAL:
  99                         /* XXX: -0xN.NNNNNNp+NNN */
 100                         return 42;
 101                 case SDB_TYPE_STRING:
 102                         if (! datum->data.string)
 103                                 return 6; /* "NULL" */
 104                         /* in the worst case, each character needs to be escaped */
 105                         return 2 * strlen(datum->data.string) + 2;
 106                 case SDB_TYPE_DATETIME:
 107                         /* "YYYY-MM-DD HH:MM:SS +zzzz" */
 108                         return 27;
 109                 case SDB_TYPE_BINARY:
 110                         /* "\xNN" */
 111                         return 4 * datum->data.binary.length + 2;
 112         }
 113         return 0;
 114 } /* sdb_data_strlen */
 115
 116 int
 117 sdb_data_format(sdb_data_t *datum, sdb_strbuf_t *buf)
 118 {
 119         if ((! datum) || (! buf))
 120                 return -1;
 121
 122         switch (datum->type) {
 123                 case SDB_TYPE_INTEGER:
 124                         sdb_strbuf_append(buf, "%"PRIi64, datum->data.integer);
 125                         break;
 126                 case SDB_TYPE_DECIMAL:
 127                         sdb_strbuf_append(buf, "%a", datum->data.decimal);
 128                         break;
 129                 case SDB_TYPE_STRING:
 130                         if (! datum->data.string) {
 131                                 sdb_strbuf_append(buf, "\"NULL\"");
 132                                 return 0;
 133                         }
 134                         {
 135                                 char tmp[2 * strlen(datum->data.string) + 1];
 136                                 size_t i, pos;
 137
 138                                 pos = 0;
 139                                 for (i = 0; i < strlen(datum->data.string); ++i) {
 140                                         char byte = datum->data.string[i];
 141
 142                                         if ((byte == '\\') || (byte == '"')) {
 143                                                 tmp[pos] = '\\';
 144                                                 ++pos;
 145                                         }
 146                                         tmp[pos] = byte;
 147                                         ++pos;
 148                                 }
 149                                 tmp[pos] = '\0';
 150                                 sdb_strbuf_append(buf, "\"%s\"", tmp);
 151                         }
 152                         break;
 153                 case SDB_TYPE_DATETIME:
 154                         {
 155                                 char tmp[64];
 156                                 if (! sdb_strftime(tmp, sizeof(tmp), "%F %T %z",
 157                                                         datum->data.datetime))
 158                                         return -1;
 159                                 tmp[sizeof(tmp) - 1] = '\0';
 160                                 sdb_strbuf_append(buf, "\"%s\"", tmp);
 161                         }
 162                         break;
 163                 case SDB_TYPE_BINARY:
 164                         {
 165                                 char tmp[4 * datum->data.binary.length + 1];
 166                                 size_t i, pos;
 167
 168                                 pos = 0;
 169                                 for (i = 0; i < datum->data.binary.length; ++i) {
 170                                         int byte = (int)datum->data.binary.datum[i];
 171                                         char hex[] = {'0', '1', '2', '3', '4', '5', '6', '7',
 172                                                 '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
 173
 174                                         tmp[pos] = '\\';
 175                                         tmp[pos + 1] = 'x';
 176                                         pos += 2;
 177
 178                                         if (byte > 0xf) {
 179                                                 tmp[pos] = hex[byte >> 4];
 180                                                 ++pos;
 181                                         }
 182                                         tmp[pos] = hex[byte & 0xf];
 183                                         ++pos;
 184                                 }
 185                                 tmp[pos] = '\0';
 186                                 sdb_strbuf_append(buf, "\"%s\"", tmp);
 187                         }
 188                         break;
 189                 default:
 190                         return -1;
 191         }
 192         return 0;
 193 } /* sdb_data_format */
 194
 195 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 196