libc: fix small bugs and remove unused code

libc/CMakeLists.txt

@@ -34,14 +34,11 @@ set(LIBC_SOURCES
     stream.c
     stream_ring.c
     string.c
-    strtod.c
-    syscall.c
     syscalls.c
     time.c
     timeconv.c
     todo.c
     unistd.c
-    fstdio2.c
 )
 
 add_compile_definitions(_NG_SOURCE=1)

libc/ctype.c

@@ -38,15 +38,15 @@ int ispunct(int c) {
 }
 
 int tolower(int c) {
-	if (c >= 'Z' && c <= 'A') {
+	if (c >= 'A' && c <= 'Z') {
 		return c + 'a' - 'A';
 	} else {
 		return c;
 	}
 }
 
 int toupper(int c) {
-	if (c >= 'z' && c <= 'a') {
+	if (c >= 'a' && c <= 'z') {
 		return c + 'A' - 'a';
 	} else {
 		return c;

libc/nightingale.c

@@ -28,7 +28,7 @@ void redirect_output_to(char *const argv[]) {
 		dup2(pipefds[0], STDIN_FILENO);
 		close(pipefds[0]);
 		close(pipefds[1]);
-		execvp(argv[0], &argv[1]);
+		execvp(argv[0], argv);
 		assert("exec failed" && 0);
 	} else {
 		dup2(pipefds[1], STDOUT_FILENO);

libc/stdlib.c

@@ -3,8 +3,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#ifndef __kernel__
-
 int abs(int x) {
 	if (x < 0) {
 		return -x;
@@ -29,6 +27,8 @@ long long llabs(long long x) {
 	}
 }
 
+#ifndef __kernel__
+
 div_t div(int x, int y) { return (div_t) { .quot = x / y, .rem = x % y }; }
 
 ldiv_t ldiv(long x, long y) { return (ldiv_t) { .quot = x / y, .rem = x % y }; }