X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Fcore%2Fdata.c;h=0e40474edaabab45e98b9dc30d31b2b244de33d9;hb=c5e7e465a3ec8eccfd881411f08244d8c5265660;hp=4e0fd779580f9dd734bf1211dc2769ca326a179f;hpb=39a45905e0b237e458b1826ff9b4fad1c4a59550;p=sysdb.git

diff --git a/src/core/data.c b/src/core/data.c
index 4e0fd77..0e40474 100644
--- a/src/core/data.c
+++ b/src/core/data.c
@@ -29,7 +29,14 @@
 #	include "config.h"
 #endif /* HAVE_CONFIG_H */
 
+#include "sysdb.h"
+
 #include "core/data.h"
+#include "utils/error.h"
+
+#include <assert.h>
+
+#include <errno.h>
 
 #include <inttypes.h>
 
@@ -37,10 +44,260 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <math.h>
+
+/*
+ * private helper functions
+ */
+
+/* this function supports in-place copies */
+static int
+copy_array_values(sdb_data_t *dst, const sdb_data_t *src, size_t elem_size)
+{
+	int type = src->type & 0xff;
+
+	if ((type == SDB_TYPE_INTEGER) || (type == SDB_TYPE_DECIMAL)) {
+		if (dst != src)
+			memcpy(dst->data.array.values, src->data.array.values,
+					src->data.array.length * elem_size);
+	}
+	else if (type == SDB_TYPE_STRING) {
+		char **s = src->data.array.values;
+		char **d = dst->data.array.values;
+		size_t i;
+
+		for (i = 0; i < src->data.array.length; ++i) {
+			d[i] = strdup(s[i]);
+			if (! d[i])
+				return -1;
+		}
+	}
+	else {
+		/* TODO */
+		errno = ENOTSUP;
+		return -1;
+	}
+	return 0;
+} /* copy_array_values */
+
+static void
+free_array_values(sdb_data_t *datum)
+{
+	int type = datum->type & 0xff;
+
+	if (type == SDB_TYPE_STRING) {
+		char **v = datum->data.array.values;
+		size_t i;
+
+		for (i = 0; i < datum->data.array.length; ++i) {
+			if (v[i])
+				free(v[i]);
+			v[i] = NULL;
+		}
+	}
+} /* free_array_values */
+
+/* Calculate the linear function 'd1 + n * d2'. */
+static int
+data_lin(const sdb_data_t *d1, int n, const sdb_data_t *d2, sdb_data_t *res)
+{
+	if (d1->type != d2->type)
+		return -1;
+
+	if (d1->type == SDB_TYPE_INTEGER)
+		res->data.integer = d1->data.integer + (int64_t)n * d2->data.integer;
+	else if (d1->type == SDB_TYPE_DECIMAL)
+		res->data.decimal = d1->data.decimal + (double)n * d2->data.decimal;
+	else if (d1->type ==  SDB_TYPE_DATETIME)
+		res->data.datetime = d1->data.datetime + (sdb_time_t)n * d2->data.datetime;
+	else
+		return -1;
+	res->type = d1->type;
+	return 0;
+} /* data_lin */
+
+/* Multiply d1 with d2. */
+static int
+data_mul(const sdb_data_t *d1, const sdb_data_t *d2, sdb_data_t *res)
+{
+	if (d1->type == SDB_TYPE_INTEGER) {
+		if (d2->type == SDB_TYPE_INTEGER)
+			res->data.integer = d1->data.integer * d2->data.integer;
+		else if (d2->type == SDB_TYPE_DATETIME) {
+			res->data.datetime = (sdb_time_t)d1->data.integer
+				* d2->data.datetime;
+			res->type = SDB_TYPE_DATETIME;
+			return 0;
+		}
+		else
+			return -1;
+	}
+	else if (d1->type == SDB_TYPE_DECIMAL) {
+		if (d2->type == SDB_TYPE_DECIMAL)
+			res->data.decimal = d1->data.decimal * d2->data.decimal;
+		else if (d2->type == SDB_TYPE_DATETIME) {
+			res->data.datetime = (sdb_time_t)(d1->data.decimal
+					* (double)d2->data.datetime);
+			res->type = SDB_TYPE_DATETIME;
+			return 0;
+		}
+		else
+			return -1;
+	}
+	else if (d1->type == SDB_TYPE_DATETIME) {
+		if (d2->type == SDB_TYPE_DATETIME)
+			res->data.datetime = d1->data.datetime
+				* d2->data.datetime;
+		else if (d2->type == SDB_TYPE_INTEGER)
+			res->data.datetime = d1->data.datetime
+				* (sdb_time_t)d2->data.integer;
+		else if (d2->type == SDB_TYPE_DECIMAL)
+			res->data.datetime = (sdb_time_t)((double)d1->data.datetime
+					* d2->data.decimal);
+		else
+			return -1;
+	}
+	else
+		return -1;
+
+	res->type = d1->type;
+	return 0;
+} /* data_mul */
+
+/* Device d1 by d2 and return the result and the remainder. */
+static int
+data_div(const sdb_data_t *d1, const sdb_data_t *d2,
+		sdb_data_t *res, sdb_data_t *rem)
+{
+	if (d1->type == SDB_TYPE_INTEGER) {
+		if (d2->type != SDB_TYPE_INTEGER)
+			return -1;
+		if (res)
+			res->data.integer = d1->data.integer / d2->data.integer;
+		if (rem)
+			rem->data.integer = d1->data.integer % d2->data.integer;
+	}
+	else if (d1->type == SDB_TYPE_DECIMAL) {
+		if (d2->type != SDB_TYPE_DECIMAL)
+			return -1;
+		if (res)
+			res->data.decimal = d1->data.decimal / d2->data.decimal;
+		if (rem)
+			rem->data.decimal = fmod(d1->data.decimal, d2->data.decimal);
+	}
+	else if (d1->type == SDB_TYPE_DATETIME) {
+		if (d2->type == SDB_TYPE_DECIMAL) {
+			if (res)
+				res->data.datetime = (sdb_time_t)((double)d1->data.datetime
+						/ d2->data.decimal);
+			if (rem) {
+				double tmp = fmod((double)d1->data.datetime, d2->data.decimal);
+				rem->data.datetime = (sdb_time_t)tmp;
+			}
+		}
+		else {
+			sdb_time_t a, b;
+			if (d2->type == SDB_TYPE_DATETIME) {
+				a = d1->data.datetime;
+				b = d2->data.datetime;
+			}
+			else if (d2->type == SDB_TYPE_INTEGER) {
+				a = d1->data.datetime;
+				b = (sdb_time_t)d2->data.integer;
+			}
+			else
+				return -1;
+			if (res)
+				res->data.datetime = a / b;
+			if (rem)
+				rem->data.datetime = a % b;
+		}
+	}
+	else
+		return -1;
+
+	if (res)
+		res->type = d1->type;
+	if (rem)
+		rem->type = d1->type;
+	return 0;
+} /* data_div */
+
+/* Concatenate d1 and d2. */
+static int
+data_concat(const sdb_data_t *d1, const sdb_data_t *d2, sdb_data_t *res)
+{
+	unsigned char *new;
+	unsigned char *s1, *s2;
+	size_t len1, len2;
+
+	/* TODO: support array plus element */
+	if (d1->type != d2->type)
+		return -1;
+
+	if (d1->type == SDB_TYPE_STRING) {
+		s1 = (unsigned char *)d1->data.string;
+		s2 = (unsigned char *)d2->data.string;
+		len1 = s1 ? strlen((char *)s1) : 0;
+		len2 = s2 ? strlen((char *)s2) : 0;
+	}
+	else if (d1->type == SDB_TYPE_BINARY) {
+		s1 = d1->data.binary.datum;
+		s2 = d2->data.binary.datum;
+		len1 = d1->data.binary.length;
+		len2 = d2->data.binary.length;
+	}
+	else if (d1->type & SDB_TYPE_ARRAY) {
+		size_t elem_size = sdb_data_sizeof(d1->type & 0xff);
+		s1 = (unsigned char *)d1->data.array.values;
+		s2 = (unsigned char *)d2->data.array.values;
+		len1 = d1->data.array.length * elem_size;
+		len2 = d2->data.array.length * elem_size;
+	}
+	else
+		return -1;
+
+	assert(s1 && s2);
+
+	new = malloc(len1 + len2 + 1);
+	if (! new)
+		return -1;
+
+	if (len1)
+		memcpy(new, s1, len1);
+	if (len2)
+		memcpy(new + len1, s2, len2);
+	new[len1 + len2] = '\0';
+
+	res->type = d1->type;
+	if (res->type == SDB_TYPE_STRING) {
+		res->data.string = (char *)new;
+	}
+	else if (res->type == SDB_TYPE_BINARY) {
+		res->data.binary.datum = new;
+		res->data.binary.length = len1 + len2;
+	}
+	else if (d1->type & SDB_TYPE_ARRAY) {
+		res->data.array.values = new;
+		res->data.array.length = len1 + len2;
+		if (copy_array_values(res, res, sdb_data_sizeof(res->type & 0xff))) {
+			/* this leaks already copied values but there's not much we can
+			 * do and this should only happen if we're in trouble anyway */
+			free(new);
+			res->data.array.values = NULL;
+			res->data.array.length = 0;
+			return -1;
+		}
+	}
+	return 0;
+} /* data_concat */
+
 /*
  * public API
  */
 
+const sdb_data_t SDB_DATA_NULL = SDB_DATA_INIT;
+
 int
 sdb_data_copy(sdb_data_t *dst, const sdb_data_t *src)
 {
@@ -50,21 +307,52 @@ sdb_data_copy(sdb_data_t *dst, const sdb_data_t *src)
 		return -1;
 
 	tmp = *src;
-	switch (src->type) {
-		case SDB_TYPE_STRING:
+	if (src->type == SDB_TYPE_STRING) {
+		if (src->data.string) {
 			tmp.data.string = strdup(src->data.string);
 			if (! tmp.data.string)
 				return -1;
-			break;
-		case SDB_TYPE_BINARY:
+		}
+	}
+	else if (src->type == SDB_TYPE_BINARY) {
+		if (src->data.binary.datum) {
 			tmp.data.binary.datum = malloc(src->data.binary.length);
 			if (! tmp.data.binary.datum)
 				return -1;
 			memcpy(tmp.data.binary.datum, src->data.binary.datum,
 					src->data.binary.length);
-			break;
+		}
+	}
+	else if (src->type == SDB_TYPE_REGEX) {
+		if (src->data.re.raw) {
+			tmp.data.re.raw = strdup(src->data.re.raw);
+			if (! tmp.data.re.raw)
+				return -1;
+			/* we need to recompile because the regex might point to
+			 * dynamically allocated memory */
+			if (regcomp(&tmp.data.re.regex, tmp.data.re.raw,
+						REG_EXTENDED | REG_ICASE | REG_NOSUB)) {
+				free(tmp.data.re.raw);
+				return -1;
+			}
+		}
+		else
+			memset(&tmp.data.re.regex, 0, sizeof(tmp.data.re.regex));
+	}
+	else if (src->type & SDB_TYPE_ARRAY) {
+		if (src->data.array.values) {
+			size_t elem_size = sdb_data_sizeof(src->type & 0xff);
+			tmp.data.array.values = calloc(src->data.array.length, elem_size);
+			if (! tmp.data.array.values)
+				return -1;
+			if (copy_array_values(&tmp, src, elem_size)) {
+				sdb_data_free_datum(&tmp);
+				return -1;
+			}
+		}
 	}
 
+	sdb_data_free_datum(dst);
 	*dst = tmp;
 	return 0;
 } /* sdb_data_copy */
@@ -75,51 +363,230 @@ sdb_data_free_datum(sdb_data_t *datum)
 	if (! datum)
 		return;
 
-	switch (datum->type) {
-		case SDB_TYPE_STRING:
-			if (datum->data.string)
-				free(datum->data.string);
-			datum->data.string = NULL;
-			break;
-		case SDB_TYPE_BINARY:
-			if (datum->data.binary.datum)
-				free(datum->data.binary.datum);
-			datum->data.binary.datum = NULL;
-			datum->data.binary.length = 0;
-			break;
+	if (datum->type == SDB_TYPE_STRING) {
+		if (datum->data.string)
+			free(datum->data.string);
+		datum->data.string = NULL;
+	}
+	else if (datum->type == SDB_TYPE_BINARY) {
+		if (datum->data.binary.datum)
+			free(datum->data.binary.datum);
+		datum->data.binary.datum = NULL;
+		datum->data.binary.length = 0;
+	}
+	else if (datum->type == SDB_TYPE_REGEX) {
+		if (datum->data.re.raw) {
+			free(datum->data.re.raw);
+			regfree(&datum->data.re.regex);
+		}
+		datum->data.re.raw = NULL;
+		memset(&datum->data.re.regex, 0, sizeof(datum->data.re.regex));
+	}
+	else if (datum->type & SDB_TYPE_ARRAY) {
+		free_array_values(datum);
+		if (datum->data.array.values)
+			free(datum->data.array.values);
+		datum->data.array.values = NULL;
+		datum->data.array.length = 0;
 	}
 } /* sdb_data_free_datum */
 
+int
+sdb_data_cmp(const sdb_data_t *d1, const 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 SDB_CMP(d1->type, d2->type);
+
+	if (d1->type == SDB_TYPE_INTEGER)
+		return SDB_CMP(d1->data.integer, d2->data.integer);
+	else if (d1->type == SDB_TYPE_DECIMAL)
+		return SDB_CMP(d1->data.decimal, d2->data.decimal);
+	else if (d1->type == SDB_TYPE_STRING) {
+		CMP_NULL(d1->data.string, d2->data.string);
+		return strcasecmp(d1->data.string, d2->data.string);
+	}
+	else if (d1->type == SDB_TYPE_DATETIME)
+		return SDB_CMP(d1->data.datetime, d2->data.datetime);
+	else if (d1->type == 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;
+	}
+	else if (d1->type == SDB_TYPE_REGEX) {
+		CMP_NULL(d1->data.re.raw, d2->data.re.raw);
+		return strcmp(d1->data.re.raw, d2->data.re.raw);
+	}
+	else if (d1->type & SDB_TYPE_ARRAY) {
+		/* TODO */
+		errno = ENOTSUP;
+		return -1;
+	}
+	return -1;
+} /* sdb_data_cmp */
+
+int
+sdb_data_strcmp(const sdb_data_t *d1, const sdb_data_t *d2)
+{
+	char d1_str[sdb_data_strlen(d1) + 1];
+	char d2_str[sdb_data_strlen(d2) + 1];
+
+	if ((d1->type & SDB_TYPE_ARRAY) || (d2->type & SDB_TYPE_ARRAY)) {
+		/* TODO */
+		errno = ENOTSUP;
+		return -1;
+	}
+
+	if (sdb_data_isnull(d1))
+		d1 = NULL;
+	if (sdb_data_isnull(d2))
+		d2 = NULL;
+
+	CMP_NULL(d1, d2);
+
+	if (sdb_data_format(d1, d1_str, sizeof(d1_str), SDB_UNQUOTED) < 0)
+		return SDB_CMP(sizeof(d1_str), sizeof(d2_str));
+	if (sdb_data_format(d2, d2_str, sizeof(d2_str), SDB_UNQUOTED) < 0)
+		return SDB_CMP(sizeof(d1_str), sizeof(d2_str));
+
+	return strcasecmp(d1_str, d2_str);
+#undef CMP_NULL
+} /* sdb_data_strcmp */
+
+_Bool
+sdb_data_isnull(const sdb_data_t *datum)
+{
+	if (! datum)
+		return 1;
+	if (datum->type == SDB_TYPE_NULL)
+		return 1;
+	if ((datum->type == SDB_TYPE_STRING) && (! datum->data.string))
+		return 1;
+	if ((datum->type == SDB_TYPE_BINARY) && (! datum->data.binary.datum))
+		return 1;
+	if ((datum->type == SDB_TYPE_REGEX) && (! datum->data.re.raw))
+		return 1;
+	if ((datum->type & SDB_TYPE_ARRAY) && (! datum->data.array.values))
+		return 1;
+	return 0;
+} /* sdb_data_isnull */
+
+int
+sdb_data_parse_op(const char *op)
+{
+	if (! strcmp(op, "+"))
+		return SDB_DATA_ADD;
+	else if (! strcmp(op, "-"))
+		return SDB_DATA_SUB;
+	else if (! strcmp(op, "*"))
+		return SDB_DATA_MUL;
+	else if (! strcmp(op, "/"))
+		return SDB_DATA_DIV;
+	else if (! strcmp(op, "%"))
+		return SDB_DATA_MOD;
+	else if (! strcmp(op, "||"))
+		return SDB_DATA_CONCAT;
+	return -1;
+} /* sdb_data_parse_op */
+
+int
+sdb_data_expr_eval(int op, const sdb_data_t *d1, const sdb_data_t *d2,
+		sdb_data_t *res)
+{
+	if ((! d1) || (! d2) || (! res))
+		return -1;
+	if (sdb_data_isnull(d1) || sdb_data_isnull(d2)) {
+		*res = SDB_DATA_NULL;
+		return 0;
+	}
+	switch (op) {
+		case SDB_DATA_CONCAT:
+			return data_concat(d1, d2, res);
+		case SDB_DATA_ADD:
+			return data_lin(d1, 1, d2, res);
+		case SDB_DATA_SUB:
+			return data_lin(d1, -1, d2, res);
+		case SDB_DATA_MUL:
+			return data_mul(d1, d2, res);
+		case SDB_DATA_DIV:
+			return data_div(d1, d2, res, NULL);
+		case SDB_DATA_MOD:
+			return data_div(d1, d2, NULL, res);
+	}
+	return -1;
+} /* sdb_data_expr_eval */
+
 size_t
-sdb_data_strlen(sdb_data_t *datum)
+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;
+	if (datum->type == SDB_TYPE_INTEGER) {
+		/* log(64) */
+		return 20;
+	}
+	else if (datum->type == SDB_TYPE_DECIMAL) {
+		/* XXX: -d.dddddde+dd or -ddddd.dddddd */
+		return 42;
+	}
+	else if (datum->type == SDB_TYPE_STRING) {
+		if (! datum->data.string)
+			return 8; /* "<NULL>" */
+		/* in the worst case, each character needs to be escaped */
+		return 2 * strlen(datum->data.string) + 2;
+	}
+	else if (datum->type == SDB_TYPE_DATETIME) {
+		/* "YYYY-MM-DD HH:MM:SS +zzzz" */
+		return 27;
+	}
+	else if (datum->type == SDB_TYPE_BINARY) {
+		if (! datum->data.binary.datum)
+			return 8; /* "<NULL>" */
+		/* "\xNN" */
+		return 4 * datum->data.binary.length + 2;
+	}
+	else if (datum->type == SDB_TYPE_REGEX) {
+		if (! datum->data.re.raw)
+			return 8; /* "<NULL>" */
+		/* "/.../" */
+		return strlen(datum->data.re.raw) + 4;
+	}
+	else if (datum->type & SDB_TYPE_ARRAY) {
+		/* TODO */
+		errno = ENOTSUP;
+		return 0;
 	}
 	return 0;
 } /* sdb_data_strlen */
 
 int
-sdb_data_format(sdb_data_t *datum, char *buf, size_t buflen, int quoted)
+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;
@@ -130,60 +597,75 @@ sdb_data_format(sdb_data_t *datum, char *buf, size_t buflen, int quoted)
 	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;
+	if (datum->type == SDB_TYPE_INTEGER) {
+		ret = snprintf(buf, buflen, "%"PRIi64, datum->data.integer);
+	}
+	else if (datum->type == SDB_TYPE_DECIMAL) {
+		ret = snprintf(buf, buflen, "%g", datum->data.decimal);
+	}
+	else if (datum->type == 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] = '\0';
-				data = tmp;
+				tmp[pos] = byte;
+				++pos;
 			}
-			break;
-		case SDB_TYPE_DATETIME:
-			if (! sdb_strftime(tmp, sizeof(tmp), "%F %T %z",
-						datum->data.datetime))
-				return -1;
-			tmp[sizeof(tmp) - 1] = '\0';
+			tmp[pos] = '\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'};
+		}
+	}
+	else if (datum->type == SDB_TYPE_DATETIME) {
+		if (! sdb_strftime(tmp, sizeof(tmp), "%F %T %z",
+					datum->data.datetime))
+			return -1;
+		tmp[sizeof(tmp) - 1] = '\0';
+		data = tmp;
+	}
+	else if (datum->type == 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;
+			tmp[pos] = '\\';
+			tmp[pos + 1] = 'x';
+			pos += 2;
 
-				if (byte > 0xf) {
-					tmp[pos] = hex[byte >> 4];
-					++pos;
-				}
-				tmp[pos] = hex[byte & 0xf];
+			if (byte > 0xf) {
+				tmp[pos] = hex[byte >> 4];
 				++pos;
 			}
+			tmp[pos] = hex[byte & 0xf];
+			++pos;
+		}
+		if (datum->data.binary.datum) {
 			tmp[pos] = '\0';
 			data = tmp;
-			break;
+		}
+		else
+			data = "<NULL>";
+	}
+	else if (datum->type == SDB_TYPE_REGEX) {
+		if (! datum->data.re.raw)
+			data = "<NULL>";
+		else {
+			snprintf(tmp, sizeof(tmp), "/%s/", datum->data.re.raw);
+			data = tmp;
+		}
+	}
+	else if (datum->type & SDB_TYPE_ARRAY) {
+		/* TODO */
+		errno = ENOTSUP;
+		return -1;
 	}
 
 	if (data) {
@@ -198,5 +680,98 @@ sdb_data_format(sdb_data_t *datum, char *buf, size_t buflen, int quoted)
 	return ret;
 } /* sdb_data_format */
 
+int
+sdb_data_parse(char *str, int type, sdb_data_t *data)
+{
+	sdb_data_t tmp;
+
+	char *endptr = NULL;
+
+	errno = 0;
+	if (type == SDB_TYPE_INTEGER) {
+		tmp.data.integer = strtoll(str, &endptr, 0);
+	}
+	else if (type == SDB_TYPE_DECIMAL) {
+		tmp.data.decimal = strtod(str, &endptr);
+	}
+	else if (type == SDB_TYPE_STRING) {
+		tmp.data.string = str;
+	}
+	else if (type == SDB_TYPE_DATETIME) {
+		double datetime = strtod(str, &endptr);
+		tmp.data.datetime = DOUBLE_TO_SDB_TIME(datetime);
+	}
+	else if (type == SDB_TYPE_BINARY) {
+		/* we don't support any binary information containing 0-bytes */
+		tmp.data.binary.length = strlen(str);
+		tmp.data.binary.datum = (unsigned char *)str;
+	}
+	else if (type == SDB_TYPE_REGEX) {
+		tmp.data.re.raw = strdup(str);
+		if (! tmp.data.re.raw)
+			return -1;
+		if (regcomp(&tmp.data.re.regex, tmp.data.re.raw,
+					REG_EXTENDED | REG_ICASE | REG_NOSUB)) {
+			sdb_log(SDB_LOG_ERR, "core: Failed to compile regular "
+					"expression '%s'", tmp.data.re.raw);
+			free(tmp.data.re.raw);
+			return -1;
+		}
+		if (! data) {
+			tmp.type = SDB_TYPE_REGEX;
+			sdb_data_free_datum(&tmp);
+		}
+	}
+	else if (type & SDB_TYPE_ARRAY) {
+		/* TODO */
+		errno = ENOTSUP;
+		return -1;
+	}
+	else {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if ((type == SDB_TYPE_INTEGER) || (type == SDB_TYPE_DECIMAL)
+			|| (type == SDB_TYPE_DATETIME)) {
+		if (errno || (str == endptr)) {
+			char errbuf[1024];
+			sdb_log(SDB_LOG_ERR, "core: Failed to parse string "
+					"'%s' as numeric value (type %i): %s", str, type,
+					sdb_strerror(errno, errbuf, sizeof(errbuf)));
+			return -1;
+		}
+		else if (endptr && (*endptr != '\0'))
+			sdb_log(SDB_LOG_WARNING, "core: Ignoring garbage after "
+					"number while parsing numeric value (type %i): %s.",
+					type, endptr);
+	}
+
+	if (data) {
+		*data = tmp;
+		data->type = type;
+	}
+	return 0;
+} /* sdb_data_parse */
+
+size_t
+sdb_data_sizeof(int type)
+{
+	sdb_data_t v;
+	if (type == SDB_TYPE_INTEGER)
+		return sizeof(v.data.integer);
+	else if (type == SDB_TYPE_DECIMAL)
+		return sizeof(v.data.decimal);
+	else if (type == SDB_TYPE_STRING)
+		return sizeof(v.data.string);
+	else if (type == SDB_TYPE_DATETIME)
+		return sizeof(v.data.datetime);
+	else if (type == SDB_TYPE_BINARY)
+		return sizeof(v.data.binary);
+	else if (type == SDB_TYPE_REGEX)
+		return sizeof(v.data.re);
+	return 0;
+} /* sdb_data_sizeof */
+
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */