add ln, util.a

Makefile

@@ -1,22 +1,27 @@
 include config.mk
 
-SRC = basename.c cat.c date.c echo.c false.c grep.c pwd.c rm.c sleep.c tee.c touch.c true.c wc.c
+LIB = util/enmasse.o util/eprintf.o
-OBJ = $(SRC:.c=.o) util.o
+SRC = basename.c cat.c date.c echo.c false.c grep.c ln.c pwd.c rm.c sleep.c tee.c touch.c true.c wc.c
+OBJ = $(SRC:.c=.o) $(LIB)
 BIN = $(SRC:.c=)
 MAN = $(SRC:.c=.1)
 
 all: $(BIN)
 
 $(OBJ): util.h
-$(BIN): util.o
+$(BIN): util.a
 
 .o:
 	@echo CC -o $@
-	@$(CC) -o $@ $< util.o $(LDFLAGS)
+	@$(CC) -o $@ $< util.a $(LDFLAGS)
 
 .c.o:
 	@echo CC -c $<
-	@$(CC) -c $< $(CFLAGS)
+	@$(CC) -c -o $@ $< $(CFLAGS)
+
+util.a: $(LIB)
+	@echo AR rc $@
+	@$(AR) rc $@ $(LIB)
 
 dist: clean
 	@echo creating dist tarball
@@ -28,4 +33,4 @@ dist: clean
 
 clean:
 	@echo cleaning
-	@rm -f $(BIN) $(OBJ)
+	@rm -f $(BIN) $(OBJ) $(LIB) util.a

config.mk

@@ -4,6 +4,8 @@ VERSION = 0.0
 #CC = cc
 CC = musl-gcc
 
+AR = ar
+
 CPPFLAGS = -D_BSD_SOURCE
 CFLAGS   = -Os -ansi -Wall -pedantic $(CPPFLAGS)
 LDFLAGS  = -s -static

ln.1

@@ -0,0 +1,22 @@
+.TH LN 1 sbase\-VERSION
+.SH NAME
+ln \- make links between files
+.SH SYNOPSIS
+.B ln
+.RB [ \-s ]
+.I file
+.RI [ name ]
+.P
+.B ln
+.RB [ \-s ]
+.RI [ files ...]
+.RI [ directory ]
+.SH DESCRIPTION
+.B ln
+creates a hard link to a given file, with the given name.  If no name is given
+it is linked into the current directory.  If multiple files are listed they will
+be linked into the given directory.
+.SH OPTIONS
+.TP
+.B \-s
+create a symbolic link.

ln.c

@@ -0,0 +1,23 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "util.h"
+
+int
+main(int argc, char *argv[])
+{
+	bool sflag = false;
+	char c;
+
+	while((c = getopt(argc, argv, "s")) != -1)
+		switch(c) {
+		case 's':
+			sflag = true;
+			break;
+		default:
+			exit(EXIT_FAILURE);
+		}
+	enmasse(argc - optind, &argv[optind], sflag ? symlink : link);
+	return EXIT_SUCCESS;
+}

util.h

@@ -1,3 +1,4 @@
 /* See LICENSE file for copyright and license details. */
 
+void enmasse(int, char **, int (*)(const char *, const char *));
 void eprintf(const char *, ...);

util/enmasse.c

@@ -0,0 +1,38 @@
+/* See LICENSE file for copyright and license details. */
+#include <libgen.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include "../util.h"
+
+void
+enmasse(int argc, char **argv, int (*fn)(const char *, const char *))
+{
+	char *buf, *dir;
+	int i;
+	long size;
+	struct stat st;
+
+	if(argc == 2 && !(stat(argv[1], &st) == 0 && S_ISDIR(st.st_mode))) {
+		if(fn(argv[0], argv[1]) != 0)
+			eprintf("%s:", argv[1]);
+		return;
+	}
+	else if(argc == 1)
+		dir = ".";
+	else
+		dir = argv[--argc];
+
+	if((size = pathconf(dir, _PC_PATH_MAX)) < 0)
+		size = BUFSIZ;
+	if(!(buf = malloc(size)))
+		eprintf("malloc:");
+	for(i = 0; i < argc; i++) {
+		snprintf(buf, size, "%s/%s", dir, basename(argv[i]));
+		if(fn(argv[i], buf) != 0)
+			eprintf("%s:", buf);
+	}
+	free(buf);
+}

util/eprintf.c

@@ -3,7 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "util.h"
+#include "../util.h"
 
 void
 eprintf(const char *fmt, ...)