Create qemu-option.h

This patch creates a new header file and the corresponding implementation file
for parsing of parameter strings for options (like used in -drive). Part of
this is code moved from vl.c (so qemu-img can use it later).

The idea is to have a data structure describing all accepted parameters. When
parsing a parameter string, the structure is copied and filled with the
parameter values.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

qemu-option.h

@@ -0,0 +1,67 @@
+/*
+ * Commandline option parsing functions
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ * Copyright (c) 2009 Kevin Wolf <kwolf@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef QEMU_OPTIONS_H
+#define QEMU_OPTIONS_H
+
+enum QEMUOptionParType {
+    OPT_FLAG,
+    OPT_NUMBER,
+    OPT_SIZE,
+    OPT_STRING,
+};
+
+typedef struct QEMUOptionParameter {
+    const char *name;
+    enum QEMUOptionParType type;
+    union {
+        uint64_t n;
+        char* s;
+    } value;
+} QEMUOptionParameter;
+
+
+const char *get_opt_name(char *buf, int buf_size, const char *p, char delim);
+const char *get_opt_value(char *buf, int buf_size, const char *p);
+
+
+/*
+ * The following functions take a parameter list as input. This is a pointer to
+ * the first element of a QEMUOptionParameter array which is terminated by an
+ * entry with entry->name == NULL.
+ */
+
+QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
+    const char *name);
+int set_option_parameter(QEMUOptionParameter *list, const char *name,
+    const char *value);
+int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
+    uint64_t value);
+QEMUOptionParameter *parse_option_parameters(const char *param,
+    QEMUOptionParameter *list, QEMUOptionParameter *dest);
+void free_option_parameters(QEMUOptionParameter *list);
+void print_option_parameters(QEMUOptionParameter *list);
+
+#endif