From a492c6ec119bd1151a6f2f7b70875ba173e9c036 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sun, 3 Sep 2023 01:30:53 +0200
Subject: libc: split up large .c files, slimming down small binaries a bit

---
 src/libc/unistd/unistd.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 src/libc/unistd/unistd.c

(limited to 'src/libc/unistd/unistd.c')

diff --git a/src/libc/unistd/unistd.c b/src/libc/unistd/unistd.c
new file mode 100644
index 0000000..102e72a
--- /dev/null
+++ b/src/libc/unistd/unistd.c
@@ -0,0 +1,85 @@
+#include <bits/panic.h>
+#include <camellia.h>
+#include <camellia/syscalls.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <elfload.h>
+
+int unlink(const char *path) {
+	hid_t h = camellia_open(path, OPEN_WRITE);
+	if (h < 0) return errno = -h, -1;
+	long ret = _sys_remove(h);
+	if (ret < 0) return errno = -ret, -1;
+	return 0;
+}
+
+int rmdir(const char *path) {
+	(void)path;
+	__libc_panic("unimplemented");
+}
+
+int execv(const char *path, char *const argv[]) {
+	return execve(path, argv, NULL);
+}
+
+int execvp(const char *path, char *const argv[]) {
+	// TODO execvp
+	return execve(path, argv, NULL);
+}
+
+int execvpe(const char *path, char *const argv[], char *const envp[]) {
+	if (path[0] != '/') {
+		char *exp = malloc(strlen(path) + 6);
+		int ret;
+		strcpy(exp, "/bin/");
+		strcat(exp, path);
+		ret = execve(exp, argv, envp);
+		free(exp);
+		return ret;
+	}
+	return execve(path, argv, envp);
+}
+
+int execve(const char *path, char *const argv[], char *const envp[]) {
+	FILE *file = fopen(path, "e");
+	char hdr[4] = {0};
+	if (!file)
+		return -1;
+
+	fread(hdr, 1, 4, file);
+	fseek(file, 0, SEEK_SET);
+
+	if (!memcmp("\x7f""ELF", hdr, 4)) {
+		elf_execf(file, (void*)argv, (void*)envp);
+		fclose(file);
+	} else if (!memcmp("#!", hdr, 2)) {
+		char buf[256];
+		fseek(file, 2, SEEK_SET);
+		if (fgets(buf, sizeof buf, file)) {
+			const char *argv [] = {buf, path, NULL};
+			char *endl = strchr(buf, '\n');
+			if (endl) *endl = '\0';
+			execve(buf, (void*)argv, envp);
+		}
+	}
+
+	errno = EINVAL;
+	return -1;
+}
+
+pid_t getpgrp(void) {
+	__libc_panic("unimplemented");
+}
+
+int getgroups(int size, gid_t list[]) {
+	(void)size; (void)list;
+	__libc_panic("unimplemented");
+}
+
+int dup(int oldfd) {
+	(void)oldfd;
+	__libc_panic("unimplemented");
+}
-- 
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