Initial checkin of gRPC to third_party/

third_party/grpc/include/grpc/support/cmdline.h

Index: third_party/grpc/include/grpc/support/cmdline.h
diff --git a/third_party/grpc/include/grpc/support/cmdline.h b/third_party/grpc/include/grpc/support/cmdline.h
new file mode 100644
index 0000000000000000000000000000000000000000..55e2ffdffe6c46799da39e12a962de6fc55ba4c6
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+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_SUPPORT_CMDLINE_H
+#define GRPC_SUPPORT_CMDLINE_H
+
+#include <grpc/support/port_platform.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Simple command line parser.
+
+   Supports flags that can be specified as -foo, --foo, --no-foo, -no-foo, etc
+   And integers, strings that can be specified as -foo=4, -foo blah, etc
+
+   No support for short command line options (but we may get that in the
+   future.)
+
+   Usage (for a program with a single flag argument 'foo'):
+
+   int main(int argc, char **argv) {
+     gpr_cmdline *cl;
+     int verbose = 0;
+
+     cl = gpr_cmdline_create("My cool tool");
+     gpr_cmdline_add_int(cl, "verbose", "Produce verbose output?", &verbose);
+     gpr_cmdline_parse(cl, argc, argv);
+     gpr_cmdline_destroy(cl);
+
+     if (verbose) {
+       gpr_log(GPR_INFO, "Goodbye cruel world!");
+     }
+
+     return 0;
+   } */
+
+typedef struct gpr_cmdline gpr_cmdline;
+
+/* Construct a command line parser: takes a short description of the tool
+   doing the parsing */
+GPRAPI gpr_cmdline *gpr_cmdline_create(const char *description);
+/* Add an integer parameter, with a name (used on the command line) and some
+   helpful text (used in the command usage) */
+GPRAPI void gpr_cmdline_add_int(gpr_cmdline *cl, const char *name,
+                                const char *help, int *value);
+/* The same, for a boolean flag */
+GPRAPI void gpr_cmdline_add_flag(gpr_cmdline *cl, const char *name,
+                                 const char *help, int *value);
+/* And for a string */
+GPRAPI void gpr_cmdline_add_string(gpr_cmdline *cl, const char *name,
+                                   const char *help, char **value);
+/* Set a callback for non-named arguments */
+GPRAPI void gpr_cmdline_on_extra_arg(
+    gpr_cmdline *cl, const char *name, const char *help,
+    void (*on_extra_arg)(void *user_data, const char *arg), void *user_data);
+/* Enable surviving failure: default behavior is to exit the process */
+GPRAPI void gpr_cmdline_set_survive_failure(gpr_cmdline *cl);
+/* Parse the command line; returns 1 on success, on failure either dies
+   (by default) or returns 0 if gpr_cmdline_set_survive_failure() has been
+   called */
+GPRAPI int gpr_cmdline_parse(gpr_cmdline *cl, int argc, char **argv);
+/* Destroy the parser */
+GPRAPI void gpr_cmdline_destroy(gpr_cmdline *cl);
+/* Get a string describing usage */
+GPRAPI char *gpr_cmdline_usage_string(gpr_cmdline *cl, const char *argv0);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GRPC_SUPPORT_CMDLINE_H */