Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / include / getopt.h

diff --git a/qemu/roms/ipxe/src/include/getopt.h b/qemu/roms/ipxe/src/include/getopt.h
new file mode 100644 (file)
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+++ b/qemu/roms/ipxe/src/include/getopt.h
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+#ifndef _GETOPT_H
+#define _GETOPT_H
+
+/** @file
+ *
+ * Parse command-line options
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stddef.h>
+
+enum getopt_argument_requirement {
+       /** Option does not take an argument */
+       no_argument = 0,
+       /** Option requires an argument */
+       required_argument = 1,
+       /** Option may have an argument */
+       optional_argument = 2,
+};
+
+/** A long option, as used for getopt_long() */
+struct option {
+       /** Long name of this option */
+       const char *name;
+       /** Option takes an argument
+        *
+        * Must be one of @c no_argument, @c required_argument, or @c
+        * optional_argument.
+        */
+       int has_arg;
+       /** Location into which to store @c val, or NULL.
+        *
+        * See the description for @c val for more details.
+        */
+       int *flag;
+       /** Value to return
+        *
+        * If @c flag is NULL, then this is the value that will be
+        * returned by getopt_long() when this option is found, and
+        * should therefore be set to the equivalent short option
+        * character.
+        *
+        * If @c flag is non-NULL, then this value will be written to
+        * the location pointed to by @flag, and getopt_long() will
+        * return 0.
+        */
+       int val;
+};
+
+extern char *optarg;
+extern int optind;
+extern int nextchar;
+extern int optopt;
+
+extern int getopt_long ( int argc, char * const argv[], const char *optstring,
+                        const struct option *longopts, int *longindex );
+
+/**
+ * Parse command-line options
+ *
+ * @v argv             Argument count
+ * @v argv             Argument list
+ * @v optstring                Option specification string
+ * @ret option         Option found, or -1 for no more options
+ *
+ * See getopt_long() for full details.
+ */
+static inline int getopt ( int argc, char * const argv[],
+                          const char *optstring ) {
+       static const struct option no_options[] = {
+               { NULL, 0, NULL, 0 }
+       };
+       return getopt_long ( argc, argv, optstring, no_options, NULL );
+}
+
+/**
+ * Reset getopt() internal state
+ *
+ * Due to a limitation of the POSIX getopt() API, it is necessary to
+ * add a call to reset_getopt() before each set of calls to getopt()
+ * or getopt_long().  This arises because POSIX assumes that each
+ * process will parse command line arguments no more than once; this
+ * assumption is not valid within Etherboot.  We work around the
+ * limitation by arranging for execv() to call reset_getopt() before
+ * executing the command.
+ */
+static inline void reset_getopt ( void ) {
+       optind = 1;
+       nextchar = 0;
+}
+
+#endif /* _GETOPT_H */