From 156e23cd69630cba8dee55eaafae5d33e40c30bc Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Wed, 29 May 2024 03:10:40 +0000
Subject: driver: implemented the -f (archive path) command-line argument.

---
 src/driver/tpax_driver_ctx.c | 109 +++++++++++++++++++++++++++++++++++++++----
 1 file changed, 100 insertions(+), 9 deletions(-)

(limited to 'src/driver/tpax_driver_ctx.c')

diff --git a/src/driver/tpax_driver_ctx.c b/src/driver/tpax_driver_ctx.c
index 6497126..7cae777 100644
--- a/src/driver/tpax_driver_ctx.c
+++ b/src/driver/tpax_driver_ctx.c
@@ -125,19 +125,27 @@ static int tpax_driver_usage_copy_mode(
 	const char *			arg,
 	const struct argv_option **	optv,
 	struct argv_meta *		meta,
-	struct argv_entry *		operand)
+	struct argv_entry *		operand,
+	struct argv_entry *		archive)
 {
 	const char * errdesc;
 
-	if (!operand) {
+	if (archive || !operand) {
 		tpax_driver_usage(
 			fdout,program,
 			arg,optv,meta);
 
-		tpax_dprintf(
-			fdout,
-			"\nThe copy mode requires a destination "
-			"directory argument.\n\n");
+		if (archive) {
+			tpax_dprintf(
+				fdout,
+				"\n%s: the __copy__ mode does not permit specifying "
+				"an archive path.\n\n",program);
+		} else {
+			tpax_dprintf(
+				fdout,
+				"\n%s: the __copy__ mode requires a destination "
+				"directory argument.\n\n",program);
+		}
 
 		return TPAX_USAGE;
 	}
@@ -234,6 +242,42 @@ static int tpax_driver_usage_block_size_range(
 	return TPAX_USAGE;
 }
 
+static int tpax_driver_error_archive_path(
+	int				fdout,
+	const char *			program,
+	const char *			arg,
+	struct argv_meta *		meta,
+	bool                            fwrite)
+{
+	int             lerrno;
+	const char *    errstr;
+
+	lerrno = errno;
+	errno  = 0;
+
+	errstr = strerror(lerrno);
+	errstr = errno ? "" : errstr;
+	errno  = lerrno;
+
+	if (fwrite) {
+		tpax_dprintf(
+			fdout,
+			"%s: archive file <%s> could not be created "
+			"or opened for writing (%s).\n",
+			program,arg,errstr);
+	} else {
+		tpax_dprintf(
+			fdout,
+			"%s: archive file <%s> could not be opened "
+			"for reading (%s).\n",
+			program,arg,errstr);
+	}
+
+	argv_free(meta);
+
+	return TPAX_FATAL;
+}
+
 static int tpax_driver_error_not_implemented(
 	int				fdout,
 	const char *			program,
@@ -337,7 +381,9 @@ int tpax_lib_get_driver_ctx(
 	const struct argv_option *	optv[TPAX_OPTV_ELEMENTS];
 	struct argv_meta *		meta;
 	struct argv_entry *		entry;
+	struct argv_entry *		archive;
 	struct argv_entry *		operand;
+	struct tpax_fd_ctx              lfdctx;
 	size_t				nunits;
 	const char *			program;
 	int				fddst;
@@ -357,6 +403,7 @@ int tpax_lib_get_driver_ctx(
 		return -1;
 
 	nunits	= 0;
+	archive = 0;
 	operand = 0;
 	program = argv_program_name(argv[0]);
 	memset(&cctx,0,sizeof(cctx));
@@ -396,6 +443,10 @@ int tpax_lib_get_driver_ctx(
 					cctx.drvflags |= TPAX_DRIVER_EXEC_MODE_COPY;
 					break;
 
+				case TAG_FILE:
+					archive = entry;
+					break;
+
 				case TAG_FORMAT:
 					cctx.drvflags &= ~(uint64_t)(TPAX_DRIVER_WRITE_FORMAT_MASK);
 
@@ -481,11 +532,11 @@ int tpax_lib_get_driver_ctx(
 
 	/* copy mode: destination directory */
 	if (cctx.drvflags & TPAX_DRIVER_EXEC_MODE_COPY) {
-		if (!operand)
+		if (archive || !operand)
 			return tpax_driver_usage_copy_mode(
 				fdctx->fderr,
 				program,entry->arg,
-				optv,meta,operand);
+				optv,meta,operand,archive);
 
 		fddst = openat(
 			fdctx->fdcwd,
@@ -496,7 +547,42 @@ int tpax_lib_get_driver_ctx(
 			return tpax_driver_usage_copy_mode(
 				fdctx->fderr,
 				program,entry->arg,
-				optv,meta,operand);
+				optv,meta,operand,archive);
+	}
+
+	/* archive path */
+	if (archive && (cctx.drvflags & TPAX_DRIVER_EXEC_MODE_WRITE)) {
+		memcpy(&lfdctx,fdctx,sizeof(*fdctx));
+
+		lfdctx.fdout = openat(
+			fdctx->fdcwd,
+			archive->arg,
+			O_WRONLY|O_CREAT|O_TRUNC,
+			0644);
+
+		if (lfdctx.fdout < 0)
+			return tpax_driver_error_archive_path(
+				fdctx->fderr,
+				program,archive->arg,
+				meta,true);
+
+		fdctx = &lfdctx;
+
+	} else if (archive) {
+		memcpy(&lfdctx,fdctx,sizeof(*fdctx));
+
+		lfdctx.fdin = openat(
+			fdctx->fdcwd,
+			archive->arg,
+			O_RDONLY,0);
+
+		if (lfdctx.fdin < 0)
+			return tpax_driver_error_archive_path(
+				fdctx->fderr,
+				program,archive->arg,
+				meta,false);
+
+		fdctx = &lfdctx;
 	}
 
 	/* not implemented mode(s) */
@@ -555,6 +641,11 @@ int tpax_lib_get_driver_ctx(
 		return tpax_get_driver_ctx_fail(meta);
 	}
 
+	if (archive) {
+		ctx->file     = archive->arg;
+		ctx->ctx.file = &ctx->file;
+	}
+
 	ctx->ctx.program	= program;
 	ctx->ctx.cctx		= &ctx->cctx;
 
-- 
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