reorganization: first steps

1 files changed, 55 insertions, 0 deletions

diff --git a/src/libc/dirent.c b/src/libc/dirent.c
new file mode 100644
index 0000000..c2d1b9c
--- /dev/null
+++ b/src/libc/dirent.c
@@ -0,0 +1,55 @@
+#include <dirent.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+DIR *opendir(const char *name) {
+	FILE *fp = NULL;
+	DIR *dir = NULL;
+	fp = fopen(name, "r");
+	if (!fp) {
+		goto err;
+	}
+	dir = calloc(1, sizeof *dir);
+	if (!dir) {
+		goto err;
+	}
+	dir->fp = fp;
+	return dir;
+err:
+	if (fp) fclose(fp);
+	free(dir);
+	return NULL;
+}
+
+int closedir(DIR *dir) {
+	fclose(dir->fp);
+	free(dir);
+	return 0;
+}
+
+struct dirent *readdir(DIR *dir) {
+	int i = 0;
+	char *buf = dir->dent.d_name;
+	for (;;) {
+		int c = fgetc(dir->fp);
+		if (c == EOF) {
+			if (i == 0) return NULL;
+			else break;
+		}
+		if (c == '\0') {
+			break;
+		}
+		if (i == sizeof(dir->dent.d_name)-1) {
+			/* overflow */
+			for (;;) {
+				c = fgetc(dir->fp);
+				if (c == EOF || c == '\0') break;
+			}
+			return errno = ENAMETOOLONG, NULL;
+		}
+		buf[i++] = c;
+	}
+	buf[i] = '\0';
+	return &dir->dent;
+}