created skeleton.

1 files changed, 177 insertions, 0 deletions

diff --git a/src/driver/mdso_driver_ctx.c b/src/driver/mdso_driver_ctx.c
new file mode 100644
index 0000000..c88bbf4
--- /dev/null
+++ b/src/driver/mdso_driver_ctx.c
@@ -0,0 +1,177 @@
+/****************************************************************/
+/*  mdso: midipix dso scavenger                                 */
+/*  Copyright (C) 2015  Z. Gilboa                               */
+/*  Released under GPLv2 and GPLv3; see COPYING.MDSO.           */
+/****************************************************************/
+
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#define ARGV_DRIVER
+
+#include <mdso/mdso.h>
+#include "mdso_driver_impl.h"
+#include "argv/argv.h"
+
+extern const struct argv_option mdso_default_options[];
+
+struct mdso_driver_ctx_alloc {
+	struct argv_meta *		meta;
+	struct mdso_driver_ctx_impl	ctx;
+	uint64_t			guard;
+	const char *			units[];
+};
+
+static uint32_t mdso_argv_flags(uint32_t flags)
+{
+	uint32_t ret = 0;
+
+	if (flags & MDSO_DRIVER_VERBOSITY_NONE)
+		ret |= ARGV_VERBOSITY_NONE;
+
+	if (flags & MDSO_DRIVER_VERBOSITY_ERRORS)
+		ret |= ARGV_VERBOSITY_ERRORS;
+
+	if (flags & MDSO_DRIVER_VERBOSITY_STATUS)
+		ret |= ARGV_VERBOSITY_STATUS;
+
+	return ret;
+}
+
+static int mdso_driver_usage(
+	const char *			program,
+	const char *			arg,
+	const struct argv_option *	options,
+	struct argv_meta *		meta)
+{
+	char header[512];
+
+	snprintf(header,sizeof(header),
+		"Usage: %s [options] <file>...\n" "Options:\n",
+		program);
+
+	argv_usage(stdout,header,options,arg);
+	argv_free(meta);
+
+	return MDSO_USAGE;
+}
+
+static struct mdso_driver_ctx_impl * mdso_driver_ctx_alloc(struct argv_meta * meta, size_t nunits)
+{
+	struct mdso_driver_ctx_alloc *	ictx;
+	size_t				size;
+	struct argv_entry *		entry;
+	const char **			units;
+
+	size =  sizeof(struct mdso_driver_ctx_alloc);
+	size += (nunits+1)*sizeof(const char *);
+
+	if (!(ictx = calloc(size,1)))
+		return 0;
+
+	for (entry=meta->entries,units=ictx->units; entry->fopt || entry->arg; entry++)
+		if (!entry->fopt)
+			*units++ = entry->arg;
+
+	ictx->ctx.ctx.units = ictx->units;
+	return &ictx->ctx;
+}
+
+int mdso_get_driver_ctx_fail(struct argv_meta * meta)
+{
+	argv_free(meta);
+	return -1;
+}
+
+int mdso_get_driver_ctx(
+	const char **		argv,
+	const char **		envp,
+	uint32_t		flags,
+	struct mdso_driver_ctx ** pctx)
+{
+	struct mdso_driver_ctx_impl *	ctx;
+	struct mdso_common_ctx		cctx;
+	const struct argv_option *	options;
+	struct argv_meta *		meta;
+	struct argv_entry *		entry;
+	size_t				nunits;
+	const char *			program;
+
+	options = mdso_default_options;
+
+	if (!(meta = argv_get(argv,options,mdso_argv_flags(flags))))
+		return -1;
+
+	nunits	= 0;
+	program = argv_program_name(argv[0]);
+	memset(&cctx,0,sizeof(cctx));
+
+	if (!argv[1] && (flags & MDSO_DRIVER_VERBOSITY_USAGE))
+		return mdso_driver_usage(program,0,options,meta);
+
+	/* get options, count units */
+	for (entry=meta->entries; entry->fopt || entry->arg; entry++) {
+		if (entry->fopt) {
+			switch (entry->tag) {
+				case TAG_HELP:
+					if (flags & MDSO_DRIVER_VERBOSITY_USAGE)
+						return mdso_driver_usage(program,entry->arg,options,meta);
+
+				case TAG_VERSION:
+					cctx.drvflags |= MDSO_DRIVER_VERSION;
+					break;
+			}
+		} else
+			nunits++;
+	}
+
+	if (!(ctx = mdso_driver_ctx_alloc(meta,nunits)))
+		return mdso_get_driver_ctx_fail(meta);
+
+	ctx->ctx.program	= program;
+	ctx->ctx.cctx		= &ctx->cctx;
+
+	memcpy(&ctx->cctx,&cctx,sizeof(cctx));
+	*pctx = &ctx->ctx;
+	return MDSO_OK;
+}
+
+int mdso_create_driver_ctx(
+	const struct mdso_common_ctx *	cctx,
+	struct mdso_driver_ctx **	pctx)
+{
+	struct argv_meta *		meta;
+	struct mdso_driver_ctx_impl *	ctx;
+	const char *			argv[] = {"mdso_driver",0};
+
+	if (!(meta = argv_get(argv,mdso_default_options,0)))
+		return -1;
+
+	if (!(ctx = mdso_driver_ctx_alloc(meta,0)))
+		return mdso_get_driver_ctx_fail(0);
+
+	ctx->ctx.cctx = &ctx->cctx;
+	memcpy(&ctx->cctx,cctx,sizeof(*cctx));
+	*pctx = &ctx->ctx;
+	return MDSO_OK;
+}
+
+static void mdso_free_driver_ctx_impl(struct mdso_driver_ctx_alloc * ictx)
+{
+	argv_free(ictx->meta);
+	free(ictx);
+}
+
+void mdso_free_driver_ctx(struct mdso_driver_ctx * ctx)
+{
+	struct mdso_driver_ctx_alloc *	ictx;
+	uintptr_t			addr;
+
+	if (ctx) {
+		addr = (uintptr_t)ctx - offsetof(struct mdso_driver_ctx_alloc,ctx);
+		addr = addr - offsetof(struct mdso_driver_ctx_impl,ctx);
+		ictx = (struct mdso_driver_ctx_alloc *)addr;
+		mdso_free_driver_ctx_impl(ictx);
+	}
+}