/****************************************************************/

/*  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);

	}

}