initial commit

2 files changed, 184 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1951f71
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,30 @@
+.POSIX:
+
+# This Makefile was generated by maje
+# See https://gitlab.com/jkaivo/maje/ for more information
+# Do not edit this Makefile by hand
+
+CC=c99
+LD=$(CC)
+CFLAGS=-Wall -Wextra -Wpedantic -Werror -g
+LDFLAGS=
+LDLIBS=
+SRCDIR=.
+OBJDIR=.
+BINDIR=$(OBJDIR)
+DESTDIR=/usr/local
+
+all: $(BINDIR)/touch
+
+clean:
+	rm -f $(BINDIR)/touch $(OBJDIR)/*.o
+
+install: $(BINDIR)/touch
+	cp $(BINDIR)/touch $(DESTDIR)/bin
+
+$(BINDIR)/touch: $(OBJDIR)/touch.o
+$(OBJDIR)/touch.o: $(SRCDIR)/touch.c
+	$(CC) $(CFLAGS) -o $@ -c $(SRCDIR)/touch.c
+
+$(BINDIR)/touch:
+	$(LD) $(LDFLAGS) -o $@ $(OBJDIR)/*.o $(LDLIBS)
diff --git a/touch.c b/touch.c
new file mode 100644
index 0000000..fd9e6ef
--- /dev/null
+++ b/touch.c
@@ -0,0 +1,154 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2022, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define _POSIX_C_SOURCE 200809L
+#include <errno.h>
+#include <fcntl.h>
+#include <locale.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <unistd.h>
+
+enum times {
+	ACCESS = (1<<0),
+	MODIFY = (1<<1),
+};
+
+static int touch(const char *path, struct timespec times[2], int create)
+{
+	int fd = open(path, (create ? O_CREAT : 0), 0644);
+	if (fd == -1) {
+		if (!create && errno == ENOENT) {
+			return 0;
+		}
+		fprintf(stderr, "touch: %s: %s\n", path, strerror(errno));
+		return 1;
+	}
+	if (futimens(fd, times) != 0) {
+		fprintf(stderr, "touch: %s: %s\n", path, strerror(errno));
+		close(fd);
+		return 1;
+	}
+	close(fd);
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "");
+	enum times which = 0;
+	int create = 1;
+	enum { CURRENT, TIME, DATE, FILE } how = CURRENT;
+	char *source = NULL;
+
+	int c;
+	while ((c = getopt(argc, argv, "acmr:t:d:")) != -1) {
+		switch(c) {
+		case 'a':
+			which |= ACCESS;
+			break;
+
+		case 'c':
+			create = 0;
+			break;
+
+		case 'm':
+			which |= MODIFY;
+			break;
+
+		case 'd':
+			if (how != CURRENT) {
+				fprintf(stderr, "touch: only one of -d, -r, and -t is allowed\n");
+				return 1;
+			}
+			how = DATE;
+			source = optarg;
+			break;
+
+		case 'r':
+			if (how != CURRENT) {
+				fprintf(stderr, "touch: only one of -d, -r, and -t is allowed\n");
+				return 1;
+			}
+			how = FILE;
+			source = optarg;
+			break;
+
+		case 't':
+			if (how != CURRENT) {
+				fprintf(stderr, "touch: only one of -d, -r, and -t is allowed\n");
+				return 1;
+			}
+			how = TIME;
+			source = optarg;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	struct timespec times[2] = { { 0 } };
+	struct stat st;
+
+	switch (how) {
+	case CURRENT:
+		times[0].tv_nsec = UTIME_NOW;
+		times[0].tv_nsec = UTIME_NOW;
+		break;
+	case DATE:
+		/* TODO */
+		break;
+	case TIME:
+		/* TODO */
+		break;
+	case FILE:
+		if (stat(source, &st) != 0) {
+			fprintf(stderr, "touch: %s: %s\n", source, strerror(errno));
+			return 1;
+		}
+		times[0] = st.st_atim;
+		times[1] = st.st_mtim;
+	}
+
+	if (which == 0) {
+		which = ACCESS | MODIFY;
+	}
+
+	if (!(which & ACCESS)) {
+		times[0].tv_nsec = UTIME_OMIT;
+	}
+
+	if (!(which & MODIFY)) {
+		times[1].tv_nsec = UTIME_OMIT;
+	}
+
+	int ret = 0;
+	do {
+		ret |= touch(argv[optind++], times, create);
+	} while (optind < argc);
+	return ret;
+}