X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Fcore%2Fdata.c;h=dc2d0ae8afde4dbb741bc2525444fddad05ed0a8;hb=56b97a180a53aecbfe9f7162b8ece3faae973cf9;hp=c71e3630e4f76dcf8d61fbb82370f818590b8b21;hpb=9527aa99f9f515e01993406607e1267cb49921f2;p=sysdb.git

diff --git a/src/core/data.c b/src/core/data.c
index c71e363..dc2d0ae 100644
--- a/src/core/data.c
+++ b/src/core/data.c
@@ -25,8 +25,15 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#if HAVE_CONFIG_H
+#	include "config.h"
+#endif /* HAVE_CONFIG_H */
+
 #include "core/data.h"
 
+#include <inttypes.h>
+
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -83,5 +90,169 @@ sdb_data_free_datum(sdb_data_t *datum)
 	}
 } /* sdb_data_free_datum */
 
+int
+sdb_data_cmp(sdb_data_t *d1, sdb_data_t *d2)
+{
+#define CMP_NULL(a, b) \
+	do { \
+		if (!(a) && !(b)) return 0; \
+		if (!(a)) return -1; \
+		if (!(b)) return 1; \
+	} while (0)
+
+	CMP_NULL(d1, d2);
+
+	if (d1->type != d2->type)
+		return -1;
+
+#define CMP(a, b) ((a) < (b) ? -1 : (a) > (b) ? 1 : 0)
+	switch (d1->type) {
+		case SDB_TYPE_INTEGER:
+			return CMP(d1->data.integer, d2->data.integer);
+		case SDB_TYPE_DECIMAL:
+			return CMP(d1->data.decimal, d2->data.decimal);
+		case SDB_TYPE_STRING:
+			CMP_NULL(d1->data.string, d2->data.string);
+			return strcasecmp(d1->data.string, d2->data.string);
+		case SDB_TYPE_DATETIME:
+			return CMP(d1->data.datetime, d2->data.datetime);
+		case SDB_TYPE_BINARY:
+		{
+			int diff;
+
+			CMP_NULL(d1->data.binary.datum, d2->data.binary.datum);
+
+			/* on a common prefix, the shorter datum sorts less */
+			if (d1->data.binary.length < d2->data.binary.length) {
+				diff = memcmp(d1->data.binary.datum, d2->data.binary.datum,
+						d1->data.binary.length);
+				diff = diff ? diff : -1;
+			}
+			else if (d1->data.binary.length > d2->data.binary.length) {
+				diff = memcmp(d1->data.binary.datum, d2->data.binary.datum,
+						d2->data.binary.length);
+				diff = diff ? diff : 1;
+			}
+			else
+				diff = memcmp(d1->data.binary.datum, d2->data.binary.datum,
+						d1->data.binary.length);
+
+			return diff;
+		}
+		default:
+			return -1;
+	}
+#undef CMP
+#undef CMP_NULL
+} /* sdb_data_cmp */
+
+size_t
+sdb_data_strlen(const sdb_data_t *datum)
+{
+	if (! datum)
+		return 0;
+
+	switch (datum->type) {
+		case SDB_TYPE_INTEGER:
+			/* log(64) */
+			return 20;
+		case SDB_TYPE_DECIMAL:
+			/* XXX: -0xN.NNNNNNp+NNN */
+			return 42;
+		case SDB_TYPE_STRING:
+			if (! datum->data.string)
+				return 6; /* "NULL" */
+			/* in the worst case, each character needs to be escaped */
+			return 2 * strlen(datum->data.string) + 2;
+		case SDB_TYPE_DATETIME:
+			/* "YYYY-MM-DD HH:MM:SS +zzzz" */
+			return 27;
+		case SDB_TYPE_BINARY:
+			/* "\xNN" */
+			return 4 * datum->data.binary.length + 2;
+	}
+	return 0;
+} /* sdb_data_strlen */
+
+int
+sdb_data_format(const sdb_data_t *datum, char *buf, size_t buflen, int quoted)
+{
+	char tmp[sdb_data_strlen(datum) + 1];
+	char *data = NULL;
+	int ret = -1;
+
+	size_t i, pos;
+
+	if ((! datum) || (! buf))
+		return -1;
+
+	switch (datum->type) {
+		case SDB_TYPE_INTEGER:
+			ret = snprintf(buf, buflen, "%"PRIi64, datum->data.integer);
+			break;
+		case SDB_TYPE_DECIMAL:
+			ret = snprintf(buf, buflen, "%a", datum->data.decimal);
+			break;
+		case SDB_TYPE_STRING:
+			if (! datum->data.string)
+				data = "NULL";
+			else {
+				pos = 0;
+				for (i = 0; i < strlen(datum->data.string); ++i) {
+					char byte = datum->data.string[i];
+
+					if ((byte == '\\') || (byte == '"')) {
+						tmp[pos] = '\\';
+						++pos;
+					}
+					tmp[pos] = byte;
+					++pos;
+				}
+				tmp[pos] = '\0';
+				data = tmp;
+			}
+			break;
+		case SDB_TYPE_DATETIME:
+			if (! sdb_strftime(tmp, sizeof(tmp), "%F %T %z",
+						datum->data.datetime))
+				return -1;
+			tmp[sizeof(tmp) - 1] = '\0';
+			data = tmp;
+			break;
+		case SDB_TYPE_BINARY:
+			pos = 0;
+			for (i = 0; i < datum->data.binary.length; ++i) {
+				int byte = (int)datum->data.binary.datum[i];
+				char hex[] = {'0', '1', '2', '3', '4', '5', '6', '7',
+					'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+
+				tmp[pos] = '\\';
+				tmp[pos + 1] = 'x';
+				pos += 2;
+
+				if (byte > 0xf) {
+					tmp[pos] = hex[byte >> 4];
+					++pos;
+				}
+				tmp[pos] = hex[byte & 0xf];
+				++pos;
+			}
+			tmp[pos] = '\0';
+			data = tmp;
+			break;
+	}
+
+	if (data) {
+		if (quoted == SDB_UNQUOTED)
+			ret = snprintf(buf, buflen, "%s", data);
+		else if (quoted == SDB_SINGLE_QUOTED)
+			ret = snprintf(buf, buflen, "'%s'", data);
+		else
+			ret = snprintf(buf, buflen, "\"%s\"", data);
+	}
+	buf[buflen - 1] = '\0';
+	return ret;
+} /* sdb_data_format */
+
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */