libc: Add stdin

Aka keyboard :)

apps/src/sh.c

@@ -138,13 +138,6 @@ void command_concat(command* cmd, const char* str)
 
 int main()
 {
-    FILE* fp = fopen("/dev/kbd", "r");
-    if (!fp)
-    {
-        perror("fopen");
-        return 1;
-    }
-
     show_prompt();
 
     char buffer[33];
@@ -154,15 +147,15 @@ int main()
 
     while (1)
     {
-        size_t nread = fread(buffer, sizeof(buffer) - 1, 1, fp);
-        if (ferror(fp))
+        size_t nread = fread(buffer, sizeof(buffer) - 1, 1, stdin);
+        if (ferror(stdin))
         {
             perror("fread");
             return 1;
         }
-        if (feof(fp))
+        if (feof(stdin))
         {
-            clearerr(fp);
+            clearerr(stdin);
             msleep(20);
             continue;
         }

libs/libc/include/stdio.h

@@ -17,6 +17,8 @@ typedef struct
 
 extern FILE* stderr;
 extern FILE* stdout;
+extern FILE* stdin;
+#define stdin stdin
 #define stdout stdout
 #define stderr stderr
 

libs/libc/include/unistd.h

@@ -6,8 +6,9 @@
 #include <luna/os-limits.h>
 #include <sys/types.h>
 
-#define STDOUT_FILENO 0
-#define STDERR_FILENO 1
+#define STDIN_FILENO 0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2
 
 #ifdef __cplusplus
 extern "C"

libs/libc/src/file.cpp

@@ -7,6 +7,7 @@
 
 FILE* stderr;
 FILE* stdout;
+FILE* stdin;
 
 extern "C"
 {

libs/libc/src/init.cpp

@@ -8,6 +8,7 @@ static void terminate_libc()
 {
     fclose(stdout);
     fclose(stderr);
+    fclose(stdin);
 }
 
 static void initialize_random()
@@ -52,6 +53,7 @@ static void check_for_file(int fd, FILE** target_stream, const char* path, const
 
 extern "C" void initialize_libc()
 {
+    check_for_file(STDIN_FILENO, &stdin, "/dev/kbd", "r");
     check_for_file(STDOUT_FILENO, &stdout, "/dev/console", "rw");
     check_for_file(STDERR_FILENO, &stderr, "/dev/console", "rw");