user: implement a basic mkdir

3 files changed, 39 insertions, 6 deletions

diff --git a/src/user/app/shell/builtins.c b/src/user/app/shell/builtins.c
index 5af11e4..0f0125c 100644
--- a/src/user/app/shell/builtins.c
+++ b/src/user/app/shell/builtins.c
@@ -5,6 +5,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/stat.h>
 #include <unistd.h>
 #include <user/lib/fs/misc.h>
 
@@ -187,6 +188,18 @@ static void cmd_ls(int argc, char **argv) {
 	}
 }
 
+static void cmd_mkdir(int argc, char **argv) {
+	// TODO mkdir -p
+	if (argc < 2) {
+		eprintf("no arguments");
+		return;
+	}
+	for (int i = 1; i < argc; i++) {
+		if (mkdir(argv[i], 0777) < 0)
+			perror(argv[i]);
+	}
+}
+
 static void cmd_rm(int argc, char **argv) {
 	if (argc < 2) {
 		eprintf("no arguments");
@@ -241,6 +254,7 @@ struct builtin builtins[] = {
 	{"hd", cmd_hexdump},
 	{"hexdump", cmd_hexdump},
 	{"ls", cmd_ls},
+	{"mkdir", cmd_mkdir},
 	{"rm", cmd_rm},
 	{"sleep", cmd_sleep},
 	{"touch", cmd_touch},
diff --git a/src/user/lib/include/sys/stat.h b/src/user/lib/include/sys/stat.h
index 78a8fc1..5776f1e 100644
--- a/src/user/lib/include/sys/stat.h
+++ b/src/user/lib/include/sys/stat.h
@@ -11,9 +11,4 @@ static inline int fstat(int fd, struct stat *sb) {
 	return -1;
 }
 
-static inline int mkdir(const char *path, mode_t mode) {
-	// TODO
-	(void)path; (void)mode;
-	errno = ENOSYS;
-	return -1;
-}
+int mkdir(const char *path, mode_t mode);
diff --git a/src/user/lib/sysstat.c b/src/user/lib/sysstat.c
new file mode 100644
index 0000000..df192c5
--- /dev/null
+++ b/src/user/lib/sysstat.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+int mkdir(const char *path, mode_t mode) {
+	// TODO error when directory already exits
+	// TODO fopen-like wrapper that calls open() with a processed path
+	(void)mode;
+	size_t plen = strlen(path);
+	char *tmp = NULL;
+	/* ensure trailing slash */
+	if (plen >= 1 && path[plen - 1] != '/') {
+		tmp = malloc(plen + 2);
+		memcpy(tmp, path, plen);
+		tmp[plen] = '/';
+		tmp[plen + 1] = '\0';
+		path = tmp;
+	}
+	FILE *f = fopen(path, "a"); /* sets errno */
+	if (f) fclose(f);
+	free(tmp);
+	return f == NULL ? -1 : 0;
+}