wsutil: add string to integer conversion utilities.

In the current code many functions have been used for convertion
(strtol, atoi, g_ascii_strtoll, etc). Those utilities want to be
the only, shared, way to convert integers.

Change-Id: I22ba1bf54e144e73a4728612a4437de5a2d339e2
Reviewed-on: https://code.wireshark.org/review/17414
Petri-Dish: Dario Lombardo <lomato@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Roland Knall <rknall@gmail.com>
Reviewed-by: Dario Lombardo <lomato@gmail.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/wsutil/strtoi.c b/wsutil/strtoi.c
new file mode 100644
index 0000000000..574743d6b5
--- /dev/null
+++ b/wsutil/strtoi.c
@@ -0,0 +1,122 @@
+/* strtoi.c
+ * Utilities to convert strings to integers
+ *
+ * Copyright 2016, Dario Lombardo
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+
+#include "strtoi.h"
+#include <errno.h>
+
+gboolean ws_strtoi64(const gchar* str, gint64* cint)
+{
+	gchar* endptr;
+	gint64 val;
+
+	errno = 0;
+	val = g_ascii_strtoll(str, &endptr, 10);
+	if ((val == 0 && endptr == str) || (*endptr != 0)) {
+		*cint = 0;
+		errno = EINVAL;
+		return FALSE;
+	}
+	if ((val == G_MAXINT64 || val == G_MININT64) && errno == ERANGE) {
+		*cint = 0;
+		/* errno is already set */
+		return FALSE;
+	}
+	*cint = val;
+	return TRUE;
+}
+
+gboolean ws_strtou64(const gchar* str, guint64* cint)
+{
+	gchar* endptr;
+	guint64 val;
+
+	errno = 0;
+	val = g_ascii_strtoull(str, &endptr, 10);
+	if ((val == 0 && endptr == str) || (*endptr != 0)) {
+		*cint = 0;
+		errno = EINVAL;
+		return FALSE;
+	}
+	if (val == G_MAXUINT64 && errno == ERANGE) {
+		*cint = 0;
+		return FALSE;
+	}
+	*cint = val;
+	return TRUE;
+}
+
+#define DEFINE_WS_STRTOI_BITS(bits) \
+gboolean ws_strtoi##bits(const gchar* str, gint##bits* cint) \
+{ \
+	gint64 val; \
+	if (!ws_strtoi64(str, &val)) { \
+		return FALSE; \
+	} \
+	if (val < G_MININT##bits || val > G_MAXINT##bits) { \
+		*cint = 0; \
+		errno = ERANGE; \
+		return FALSE; \
+	} \
+	*cint = (gint##bits)val; \
+	return TRUE; \
+}
+
+DEFINE_WS_STRTOI_BITS(32);
+DEFINE_WS_STRTOI_BITS(16);
+DEFINE_WS_STRTOI_BITS(8);
+
+#define DEFINE_WS_STRTOU_BITS(bits) \
+int ws_strtou##bits(const gchar* str, guint##bits* cint) \
+{ \
+	guint64 val; \
+	if (!ws_strtou64(str, &val)) { \
+		return FALSE; \
+	} \
+	if (val > G_MAXUINT##bits) { \
+		*cint = 0; \
+		errno = ERANGE; \
+		return FALSE; \
+	} \
+	*cint = (guint##bits)val; \
+	return TRUE; \
+}
+
+DEFINE_WS_STRTOU_BITS(32);
+DEFINE_WS_STRTOU_BITS(16);
+DEFINE_WS_STRTOU_BITS(8);
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 noexpandtab:
+ * :indentSize=4:tabSize=8:noTabs=false:
+ */