From 152fb2bdb81af70c5682102c86009317caaf3ca0 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <m@maandree.se>
Date: Sun, 1 Feb 2026 15:00:22 +0100
Subject: Add multicall binary
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Signed-off-by: Mattias Andrée <m@maandree.se>
---
 .gitignore     |  3 +++
 Makefile       | 49 +++++++++++++++++++++++++++++++++++++++++--------
 charconv-mcb.c | 31 +++++++++++++++++++++++++++++++
 common.h       |  4 ++++
 config.mk      |  3 +++
 5 files changed, 82 insertions(+), 8 deletions(-)
 create mode 100644 charconv-mcb.c

diff --git a/.gitignore b/.gitignore
index 9bdfa88..7af26d0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,5 +12,8 @@
 *.gcov
 *.gcno
 *.gcda
+*.bo
 /convert-to-*
 !/convert-to-*.c
+/charconv-mcb.h
+/charconv-mcb
diff --git a/Makefile b/Makefile
index e74a5d9..8b92b86 100644
--- a/Makefile
+++ b/Makefile
@@ -201,29 +201,47 @@ LIBOBJ =\
 LOBJ = $(LIBOBJ:.o=.lo)
 
 BINOBJ = $(BIN:=.o) common.o
+MCBOBJ = $(BIN:=.bo) common.o
 
 
-all: libcharconv.a libcharconv.$(LIBEXT) $(BIN)
+all: libcharconv.a libcharconv.$(LIBEXT) $(BIN) charconv-mcb
 common.o: libcharconv.h common.h
+$(MCBOBJ): libcharconv.h common.h
 $(BINOBJ): libcharconv.h common.h
 $(LIBOBJ): libcharconv.h lib-common.h
 $(LOBJ): libcharconv.h lib-common.h
 $(BIN): common.o libcharconv.a
+charconv-mcb.o: libcharconv.h common.h charconv-mcb.h
 
 libcharconv_rotated_90deg_ccw.o libcharconv_rotated_90deg_ccw.lo: libcharconv_rotated_90deg_cw.c
 libcharconv_rotated_45deg_ccw.o libcharconv_rotated_45deg_ccw.lo: libcharconv_rotated_45deg_cw.c
 
+charconv-mcb.h: Makefile
+	printf '#define LIST_BINS(X)' > $@
+	set -e && \
+	for c in $(BIN); do \
+		printf '\\\n\tX("%s", main_%s)' \
+			$$c $$(printf '%s\n' $$c | cut -d - -f 3- | tr - _); \
+	done >> $@
+	printf '\n' >> $@
+
+charconv-mcb: charconv-mcb.o $(MCBOBJ) libcharconv.a
+	$(CC) -o $@ charconv-mcb.o $(MCBOBJ) libcharconv.a $(LDFLAGS)
+
 .c.o:
 	$(CC) -c -o $@ $< $(CFLAGS) $(CPPFLAGS)
 
+.c.bo:
+	$(CC) -c -o $@ $< -Dmain=main_$$(printf '%s\n' $* | cut -d - -f 3- | tr - _) $(CFLAGS) $(CPPFLAGS)
+
 .c.lo:
 	$(CC) -fPIC -c -o $@ $< $(CFLAGS) $(CPPFLAGS)
 
 .o:
-	$(CC) -fPIC -o $@ $< common.o libcharconv.a $(LDFLAGS)
+	$(CC) -o $@ $< common.o libcharconv.a $(LDFLAGS)
 
 .c:
-	$(CC) -fPIC -o $@ $< common.o libcharconv.a $(CFLAGS) $(CPPFLAGS) $(LDFLAGS)
+	$(CC) -o $@ $< common.o libcharconv.a $(CFLAGS) $(CPPFLAGS) $(LDFLAGS)
 
 libcharconv.a: $(LIBOBJ)
 	@rm -f -- $@
@@ -233,9 +251,24 @@ libcharconv.a: $(LIBOBJ)
 libcharconv.$(LIBEXT): $(LOBJ)
 	$(CC) $(LIBFLAGS) -o $@ $(LOBJ) $(LDFLAGS)
 
-install: libcharconv.a libcharconv.$(LIBEXT) $(BIN)
-	mkdir -p -- "$(DESTDIR)$(PREFIX)/lib"
+install: $(BIN)
+	+$(MAKE) install-common
+	mkdir -p -- "$(DESTDIR)$(PREFIX)/bin"
+	cp -- $(BIN) "$(DESTDIR)$(PREFIX)/bin/"
+
+install-mcb: charconv-mcb
+	+$(MAKE) install-common
 	mkdir -p -- "$(DESTDIR)$(PREFIX)/bin"
+	mkdir -p -- "$(DESTDIR)$(PREFIX)$(LIBEXEC)"
+	cp -- charconv-mcb "$(DESTDIR)$(PREFIX)$(LIBEXEC)/"
+	set -e && \
+	for f in $(BIN); do \
+		test ! -d "$(DESTDIR)$(PREFIX)/bin/$$f" && \
+		ln $(LNFLAGS) -- "..$(LIBEXEC)/charconv-mcb" "$(DESTDIR)$(PREFIX)/bin/$$f";\
+	done
+
+install-common: libcharconv.a libcharconv.$(LIBEXT)
+	mkdir -p -- "$(DESTDIR)$(PREFIX)/lib"
 	mkdir -p -- "$(DESTDIR)$(PREFIX)/include"
 	cp -- libcharconv.a "$(DESTDIR)$(PREFIX)/lib/"
 	cp -- libcharconv.$(LIBEXT) "$(DESTDIR)$(PREFIX)/lib/libcharconv.$(LIBMINOREXT)"
@@ -243,7 +276,6 @@ install: libcharconv.a libcharconv.$(LIBEXT) $(BIN)
 	ln -sf -- libcharconv.$(LIBMINOREXT) "$(DESTDIR)$(PREFIX)/lib/libcharconv.$(LIBMAJOREXT)"
 	ln -sf -- libcharconv.$(LIBMAJOREXT) "$(DESTDIR)$(PREFIX)/lib/libcharconv.$(LIBEXT)"
 	cp -- libcharconv.h "$(DESTDIR)$(PREFIX)/include/"
-	cp -- $(BIN) "$(DESTDIR)$(PREFIX)/bin/"
 
 uninstall:
 	-rm -f -- "$(DESTDIR)$(PREFIX)/lib/libcharconv.a"
@@ -256,8 +288,9 @@ uninstall:
 clean:
 	-rm -f -- *.o *.a *.lo *.su *.so *.so.* *.dll *.dylib
 	-rm -f -- *.gch *.gcov *.gcno *.gcda *.$(LIBEXT) $(BIN)
+	-rm -f -- charconv-mcb.h charconv-mcb *.bo
 
 .SUFFIXES:
-.SUFFIXES: .lo .o .c
+.SUFFIXES: .lo .o .c .bo
 
-.PHONY: all install uninstall clean
+.PHONY: all install install-mcb install-common uninstall clean
diff --git a/charconv-mcb.c b/charconv-mcb.c
new file mode 100644
index 0000000..798ff3b
--- /dev/null
+++ b/charconv-mcb.c
@@ -0,0 +1,31 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#include "charconv-mcb.h"
+
+
+#define X(NAME, MAIN)\
+	extern int MAIN(int argc, char *argv[]);
+LIST_BINS(X)
+#undef X
+
+
+char *argv0 = NULL;
+
+
+int
+main(int argc, char *argv[])
+{
+	char *command = argv[0];
+	char *p = strrchr(command, '/');
+
+	command = p ? &p[1] : command;
+
+#define X(NAME, MAIN)\
+	if (!strcmp(command, NAME))\
+		return MAIN(argc, argv);
+	LIST_BINS(X)
+#undef X
+
+	fprintf(stderr, "%s: invalid invocation of multicall binary\n", argv[0]);
+	return 125;
+}
diff --git a/common.h b/common.h
index 7e42a49..d33a924 100644
--- a/common.h
+++ b/common.h
@@ -5,6 +5,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+
+#ifdef main
+# define LIBSIMPLY_CONFIG_MULTICALL_BINARY
+#endif
 #include <libsimple-arg.h>
 
 
diff --git a/config.mk b/config.mk
index f4adf12..409eb9d 100644
--- a/config.mk
+++ b/config.mk
@@ -1,8 +1,11 @@
 PREFIX    = /usr
 MANPREFIX = $(PREFIX)/share/man
+LIBEXEC   = /libexec
 
 CC = c99
 
 CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE
 CFLAGS   =
 LDFLAGS  =
+
+LNFLAGS = -sf
-- 
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