1 files changed, 248 insertions, 0 deletions
diff --git a/src/driver/tpax_driver_ctx.c b/src/driver/tpax_driver_ctx.c
new file mode 100644
index 0000000..96fe8ff
--- /dev/null
+++ b/src/driver/tpax_driver_ctx.c
@@ -0,0 +1,248 @@
+/******************************************************/
+/*  tpax: a topological pax implementation            */
+/*  Copyright (C) 2020  Z. Gilboa                     */
+/*  Released under GPLv2 and GPLv3; see COPYING.TPAX. */
+/******************************************************/
+
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#define ARGV_DRIVER
+
+#include <tpax/tpax.h>
+#include "tpax_version.h"
+#include "tpax_driver_impl.h"
+#include "argv/argv.h"
+
+/* package info */
+static const struct tpax_source_version tpax_src_version = {
+	TPAX_TAG_VER_MAJOR,
+	TPAX_TAG_VER_MINOR,
+	TPAX_TAG_VER_PATCH,
+	TPAX_GIT_VERSION
+};
+
+/* default fd context */
+static const struct tpax_fd_ctx tpax_default_fdctx = {
+	.fdin  = STDIN_FILENO,
+	.fdout = STDOUT_FILENO,
+	.fderr = STDERR_FILENO,
+	.fdcwd = AT_FDCWD,
+	.fddst = AT_FDCWD,
+	.fdlog = (-1),
+};
+
+struct tpax_driver_ctx_alloc {
+	struct argv_meta *		meta;
+	struct tpax_driver_ctx_impl	ctx;
+	uint64_t			guard;
+	const char *			units[];
+};
+
+static uint32_t tpax_argv_flags(uint32_t flags)
+{
+	uint32_t ret = ARGV_CLONE_VECTOR;
+
+	if (flags & TPAX_DRIVER_VERBOSITY_NONE)
+		ret |= ARGV_VERBOSITY_NONE;
+
+	if (flags & TPAX_DRIVER_VERBOSITY_ERRORS)
+		ret |= ARGV_VERBOSITY_ERRORS;
+
+	if (flags & TPAX_DRIVER_VERBOSITY_STATUS)
+		ret |= ARGV_VERBOSITY_STATUS;
+
+	return ret;
+}
+
+static int tpax_driver_usage(
+	int				fdout,
+	const char *			program,
+	const char *			arg,
+	const struct argv_option **	optv,
+	struct argv_meta *		meta)
+{
+	char header[512];
+
+	snprintf(header,sizeof(header),
+		"Usage: %s [options] <file>...\n" "Options:\n",
+		program);
+
+	argv_usage(fdout,header,optv,arg);
+	argv_free(meta);
+
+	return TPAX_USAGE;
+}
+
+static struct tpax_driver_ctx_impl * tpax_driver_ctx_alloc(
+	struct argv_meta *		meta,
+	const struct tpax_fd_ctx *	fdctx,
+	const struct tpax_common_ctx *	cctx,
+	size_t				nunits)
+{
+	struct tpax_driver_ctx_alloc *	ictx;
+	size_t				size;
+	struct argv_entry *		entry;
+	const char **			units;
+	int				elements;
+
+	size =  sizeof(struct tpax_driver_ctx_alloc);
+	size += (nunits+1)*sizeof(const char *);
+
+	if (!(ictx = calloc(1,size)))
+		return 0;
+
+	memcpy(&ictx->ctx.fdctx,fdctx,sizeof(*fdctx));
+	memcpy(&ictx->ctx.cctx,cctx,sizeof(*cctx));
+
+	elements = sizeof(ictx->ctx.erribuf) / sizeof(*ictx->ctx.erribuf);
+
+	ictx->ctx.errinfp  = &ictx->ctx.erriptr[0];
+	ictx->ctx.erricap  = &ictx->ctx.erriptr[--elements];
+
+	ictx->meta = meta;
+
+	for (entry=meta->entries,units=ictx->units; entry->fopt || entry->arg; entry++)
+		if (!entry->fopt)
+			*units++ = entry->arg;
+
+	ictx->ctx.ctx.units = ictx->units;
+	ictx->ctx.ctx.errv  = ictx->ctx.errinfp;
+	return &ictx->ctx;
+}
+
+static int tpax_get_driver_ctx_fail(struct argv_meta * meta)
+{
+	argv_free(meta);
+	return -1;
+}
+
+int tpax_get_driver_ctx(
+	char **				argv,
+	char **				envp,
+	uint32_t			flags,
+	const struct tpax_fd_ctx *	fdctx,
+	struct tpax_driver_ctx ** 	pctx)
+{
+	struct tpax_driver_ctx_impl *	ctx;
+	struct tpax_common_ctx		cctx;
+	const struct argv_option *	optv[TPAX_OPTV_ELEMENTS];
+	struct argv_meta *		meta;
+	struct argv_entry *		entry;
+	size_t				nunits;
+	const char *			program;
+
+	(void)envp;
+
+	if (!fdctx)
+		fdctx = &tpax_default_fdctx;
+
+	argv_optv_init(tpax_default_options,optv);
+
+	if (!(meta = argv_get(
+			argv,optv,
+			tpax_argv_flags(flags),
+			fdctx->fderr)))
+		return -1;
+
+	nunits	= 0;
+	program = argv_program_name(argv[0]);
+	memset(&cctx,0,sizeof(cctx));
+	cctx.drvflags = flags;
+
+	if (!argv[1] && (flags & TPAX_DRIVER_VERBOSITY_USAGE))
+		return tpax_driver_usage(
+			fdctx->fderr,
+			program,
+			0,optv,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 & TPAX_DRIVER_VERBOSITY_USAGE)
+						return tpax_driver_usage(
+							fdctx->fdout,
+							program,entry->arg,
+							optv,meta);
+					break;
+
+				case TAG_VERSION:
+					cctx.drvflags |= TPAX_DRIVER_VERSION;
+					break;
+			}
+		} else
+			nunits++;
+	}
+
+	if (!(ctx = tpax_driver_ctx_alloc(meta,fdctx,&cctx,nunits)))
+		return tpax_get_driver_ctx_fail(meta);
+
+	ctx->ctx.program	= program;
+	ctx->ctx.cctx		= &ctx->cctx;
+
+	*pctx = &ctx->ctx;
+	return TPAX_OK;
+}
+
+static void tpax_free_driver_ctx_impl(struct tpax_driver_ctx_alloc * ictx)
+{
+	argv_free(ictx->meta);
+	free(ictx);
+}
+
+void tpax_free_driver_ctx(struct tpax_driver_ctx * ctx)
+{
+	struct tpax_driver_ctx_alloc *	ictx;
+	uintptr_t			addr;
+
+	if (ctx) {
+		addr = (uintptr_t)ctx - offsetof(struct tpax_driver_ctx_impl,ctx);
+		addr = addr - offsetof(struct tpax_driver_ctx_alloc,ctx);
+		ictx = (struct tpax_driver_ctx_alloc *)addr;
+		tpax_free_driver_ctx_impl(ictx);
+	}
+}
+
+const struct tpax_source_version * tpax_source_version(void)
+{
+	return &tpax_src_version;
+}
+
+int tpax_get_driver_fdctx(
+	const struct tpax_driver_ctx *	dctx,
+	struct tpax_fd_ctx *		fdctx)
+{
+	struct tpax_driver_ctx_impl *	ictx;
+
+	ictx = tpax_get_driver_ictx(dctx);
+
+	fdctx->fdin  = ictx->fdctx.fdin;
+	fdctx->fdout = ictx->fdctx.fdout;
+	fdctx->fderr = ictx->fdctx.fderr;
+	fdctx->fdlog = ictx->fdctx.fdlog;
+	fdctx->fdcwd = ictx->fdctx.fdcwd;
+	fdctx->fddst = ictx->fdctx.fddst;
+
+	return 0;
+}
+
+int tpax_set_driver_fdctx(
+	struct tpax_driver_ctx *	dctx,
+	const struct tpax_fd_ctx *	fdctx)
+{
+	struct tpax_driver_ctx_impl *	ictx;
+
+	ictx = tpax_get_driver_ictx(dctx);
+
+	ictx->fdctx.fdin  = fdctx->fdin;
+	ictx->fdctx.fdout = fdctx->fdout;
+	ictx->fdctx.fderr = fdctx->fderr;
+	ictx->fdctx.fdlog = fdctx->fdlog;
+	ictx->fdctx.fdcwd = fdctx->fdcwd;
+	ictx->fdctx.fddst = fdctx->fddst;
+
+	return 0;
+}