output: added slbt_output_config(): print a compatible --config output.

1 files changed, 100 insertions, 0 deletions

diff --git a/src/output/slbt_output_config.c b/src/output/slbt_output_config.c
new file mode 100644
index 0000000..d779c68
--- /dev/null
+++ b/src/output/slbt_output_config.c
@@ -0,0 +1,100 @@
+/*******************************************************************/
+/*  slibtool: a skinny libtool implementation, written in C        */
+/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */
+/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include <slibtool/slibtool.h>
+#include "slibtool_driver_impl.h"
+#include "slibtool_dprintf_impl.h"
+#include "slibtool_errinfo_impl.h"
+
+static const char lconf_begin[] = "# ### BEGIN LIBTOOL CONFIG\n";
+static const char lconf_end  [] = "# ### END LIBTOOL CONFIG\n";
+
+static int slbt_output_config_lconf(
+	const struct slbt_driver_ctx * dctx,
+	const struct slbt_map_info *   lconf)
+{
+	const char *    ch;
+	const char *    cfg_begin;
+	const char *    cfg_end;
+	const char *    map_cap;
+	size_t          cmp_len;
+	size_t          end_len;
+	size_t          min_len;
+	size_t          nbytes;
+	ssize_t         written;
+	int             fdout;
+
+	cmp_len = strlen(lconf_begin);
+	end_len = strlen(lconf_end);
+	min_len = cmp_len + end_len;
+
+	if (lconf->size < min_len)
+		return SLBT_CUSTOM_ERROR(
+			dctx,
+			SLBT_ERR_FLOW_ERROR);
+
+	map_cap  = lconf->addr;
+	map_cap += lconf->size;
+	map_cap -= strlen(lconf_end);
+	map_cap -= strlen(lconf_begin);
+
+	cfg_begin = cfg_end = 0;
+
+	for (ch=lconf->addr; !cfg_begin && (ch < map_cap); ch++)
+		if (!strncmp(ch,lconf_begin,cmp_len))
+			cfg_begin = ch;
+
+	if (!cfg_begin)
+		return SLBT_CUSTOM_ERROR(
+			dctx,
+			SLBT_ERR_FLOW_ERROR);
+
+	for (++ch; !cfg_end && (ch < map_cap); ch++)
+		if (!strncmp(ch,lconf_end,end_len))
+			cfg_end = ch;
+
+	if (!cfg_end)
+		return SLBT_CUSTOM_ERROR(
+			dctx,
+			SLBT_ERR_FLOW_ERROR);
+
+	fdout  = slbt_driver_fdout(dctx);
+	nbytes = cfg_end - cfg_begin - cmp_len;
+
+	for (ch=&cfg_begin[cmp_len]; nbytes; ) {
+		written = write(fdout,ch,nbytes);
+
+		while ((written < 0) && (errno == EINTR))
+			written = write(fdout,ch,nbytes);
+
+		if (written < 0)
+			return SLBT_SYSTEM_ERROR(dctx,0);
+
+		nbytes -= written;
+		ch     += written;
+	}
+
+	return 0;
+}
+
+int slbt_output_config(const struct slbt_driver_ctx * dctx)
+{
+	struct slbt_driver_ctx_impl *   ictx;
+	const struct slbt_map_info *    lconf;
+
+	ictx  = slbt_get_driver_ictx(dctx);
+	lconf = &ictx->lconf;
+
+	if (lconf->addr)
+		return slbt_output_config_lconf(
+			dctx,lconf);
+
+	return 0;
+}