X-Git-Url: http://rtime.felk.cvut.cz/gitweb/jailhouse.git/blobdiff_plain/4e0ea74420900c7a66d265117b09fddbc3aaa754..f053c948f5b6fe7b9ec5cf6533e177fd42113ba3:/inmates/lib/cmdline.c

diff --git a/inmates/lib/cmdline.c b/inmates/lib/cmdline.c
new file mode 100644
index 0000000..bcbedb0
--- /dev/null
+++ b/inmates/lib/cmdline.c
@@ -0,0 +1,111 @@
+/*
+ * Jailhouse, a Linux-based partitioning hypervisor
+ *
+ * Copyright (c) Siemens AG, 2016
+ *
+ * Authors:
+ *  Jan Kiszka <jan.kiszka@siemens.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include <inmate.h>
+
+extern const char cmdline[];
+
+static bool get_param(const char *param, char *value_buffer,
+		      unsigned long buffer_size)
+{
+	unsigned long param_len = strlen(param);
+	const char *p = cmdline;
+
+	while (1) {
+		/* read over leading blanks */
+		while (*p == ' ')
+			p++;
+
+		if (strncmp(p, param, param_len) == 0) {
+			p += param_len;
+
+			/* check for boolean parameter */
+			if ((buffer_size == 0 && (*p == ' ' || *p == 0)))
+				return true;
+
+			/* extract parameter value */
+			if (*p == '=') {
+				p++;
+				while (buffer_size > 1) {
+					if (*p == ' ' || *p == 0)
+						break;
+					*value_buffer++ = *p++;
+					buffer_size--;
+				}
+				if (buffer_size > 0)
+					*value_buffer = 0;
+				return true;
+			}
+		}
+
+		/* search for end of this parameter */
+		while (*p != ' ') {
+			if (*p == 0)
+				return false;
+			p++;
+		}
+	}
+}
+
+const char *cmdline_parse_str(const char *param, char *value_buffer,
+			      unsigned long buffer_size,
+			      const char *default_value)
+{
+	if (get_param(param, value_buffer, buffer_size))
+		return value_buffer;
+	else
+		return default_value;
+}
+
+long long cmdline_parse_int(const char *param, long long default_value)
+{
+	char value_buffer[32];
+	char *p = value_buffer;
+	bool negative = false;
+	long long value = 0;
+
+	if (!get_param(param, value_buffer, sizeof(value_buffer)))
+		return default_value;
+
+	if (strncmp(p, "0x", 2) == 0) {
+		p += 2;
+		do {
+			if (*p >= '0' && *p <= '9')
+				value = (value << 4) + *p - '0';
+			else if (*p >= 'A' && *p <= 'F')
+				value = (value << 4) + *p - 'A' + 10;
+			else if (*p >= 'a' && *p <= 'f')
+				value = (value << 4) + *p - 'a' + 10;
+			else
+				return default_value;
+			p++;
+		} while (*p != 0);
+	} else {
+		if (*p == '-' || *p == '+')
+			negative = (*p++ == '-');
+
+		do {
+			if (*p >= '0' && *p <= '9')
+				value = (value * 10) + *p - '0';
+			else
+				return default_value;
+			p++;
+		} while (*p != 0);
+	}
+
+	return negative ? -value : value;
+}
+
+bool cmdline_parse_bool(const char *param)
+{
+	return get_param(param, NULL, 0);
+}