4 files changed, 43 insertions, 1 deletions

diff --git a/src/shared/include/camellia/errno.h b/src/shared/include/camellia/errno.h
index 0c3afb3..3ff735a 100644
--- a/src/shared/include/camellia/errno.h
+++ b/src/shared/include/camellia/errno.h
@@ -3,3 +3,4 @@
 #define EFAULT 2
 #define EBADF 3 /* Invalid file descriptor. */
 #define EINVAL 4
+#define ENOSYS 5 /* Unsupported. */
diff --git a/src/user/lib/elfload.c b/src/user/lib/elfload.c
index a471513..5ba596f 100644
--- a/src/user/lib/elfload.c
+++ b/src/user/lib/elfload.c
@@ -12,9 +12,9 @@ void elf_execf(FILE *f) {
 	const size_t cap = 0x60000;
 	size_t pos = 0;
 	void *buf = malloc(cap); // TODO a way to get file size
+	fseek(f, 0, SEEK_SET);
 	if (buf && fread(buf, 1, cap - pos, f))
 		elf_exec(buf);
-
 	free(buf);
 }
 
diff --git a/src/user/lib/file.c b/src/user/lib/file.c
index 44fa194..bd6bc56 100644
--- a/src/user/lib/file.c
+++ b/src/user/lib/file.c
@@ -143,13 +143,48 @@ size_t fwrite(const void *restrict ptr, size_t size, size_t nitems, FILE *restri
 	return nitems;
 }
 
+int fseek(FILE *f, long offset, int whence) {
+	if (fflush(f))
+		return -1;
+
+	switch (whence) {
+		case SEEK_SET:
+			f->pos = 0;
+			break;
+		case SEEK_CUR:
+			break;
+		case SEEK_END:
+			f->pos = -1;
+			// TODO doesn't -1 put the cursor before the last byte? i need to fix up the drivers
+			break;
+		default:
+			errno = EINVAL;
+			return -1;
+	}
+
+	bool pos_neg = f->pos < 0;
+	f->pos += offset;
+	if (pos_neg && f->pos >= 0) {
+		errno = ENOSYS; // TODO
+		return -1;
+	}
+	f->eof = false;
+	return 0;
+}
+
 int fclose(FILE *f) {
+	fflush(f);
 	if (f->fd > 0) close(f->fd);
 	if (f != &_stdin_null && f != &_stdout_null)
 		free(f);
 	return 0;
 }
 
+int fflush(FILE *f) {
+	(void)f;
+	return 0;
+}
+
 int feof(FILE *f) {
 	return f->eof;
 }
diff --git a/src/user/lib/include/stdio.h b/src/user/lib/include/stdio.h
index b8de85d..eb59793 100644
--- a/src/user/lib/include/stdio.h
+++ b/src/user/lib/include/stdio.h
@@ -4,6 +4,10 @@
 
 #define EOF (-1)
 
+#define SEEK_SET 1
+#define SEEK_CUR 2
+#define SEEK_END 3
+
 int printf(const char *fmt, ...);
 int snprintf(char *str, size_t len, const char *fmt, ...);
 
@@ -17,9 +21,11 @@ FILE *freopen(const char *path, const char *mode, FILE *);
 FILE *fdopen(int fd, const char *mode);
 FILE *file_clone(const FILE *);
 int fclose(FILE *);
+int fflush(FILE *f);
 
 size_t fread(void *restrict ptr, size_t size, size_t nitems, FILE *restrict);
 size_t fwrite(const void *restrict ptr, size_t size, size_t nitems, FILE *restrict);
+int fseek(FILE *f, long offset, int whence);
 
 int feof(FILE *);
 int ferror(FILE *);