Remove kernel implementation of sprintf

src/kernel/boot/debug.c

@@ -1,124 +0,0 @@
-#include <stdarg.h>
-#include <stdint.h>
-#include <string.h>
-#include <terminal.h>
-
-void num2str(char *buf, uint64_t num, uint64_t base)
-{
-    if(num == 0)
-    {
-        buf[0] = '0';
-        buf[1] = '\0';
-        return;
-    }
-    uint64_t i=0, j=0;
-    char chars[] = "0123456789ABCDEF";
-    while(num > 0)
-    {
-        buf[i++] = chars[num%base];
-        num /= base;
-    }
-    i--;
-    while(j<i)
-    {
-        char t = buf[i];
-        buf[i--] = buf[j];
-        buf[j++] = t;
-    }
-    buf[i+j+1] = '\0';
-}
-
-void debug_putch(char c)
-{
-    terminal_write(c);
-}
-
-void debug_putsn(char *s, size_t n)
-{
-    while(n--)
-        debug_putch(*s++);
-}
-
-void debug_puts(char *s)
-{
-    size_t len = 0;
-    while(s[len]) len++;
-    debug_putsn(s, len);
-}
-
-void debug_vprintf(char *fmt, va_list args)
-{
-    if(!(*fmt))
-        return;
-    
-    if(*fmt != '%')
-    {
-        size_t len = 0;
-        while(fmt[len] && fmt[len] != '%')
-            len++;
-        debug_putsn(fmt, len);
-        debug_vprintf(&fmt[len], args);
-        return;
-    }
-
-    fmt++;
-    size_t padwidth = 0;
-    char padchar = ' ';
-    if(*fmt == '0')
-    {
-        padchar = '0';
-        fmt++;
-    }
-    while(*fmt >= '0' && *fmt <='9')
-    {
-        padwidth *= 10;
-        padwidth += (int)(*fmt++ - '0');
-    }
-    uint64_t base = 0;
-    switch(*fmt)
-    {
-        case 'b':
-            base = 2;
-            break;
-        case 'o':
-            base = 8;
-            break;
-        case 'd':
-            base = 10;
-            break;
-        case 'x':
-            base = 16;
-            break;
-        case 'c':
-            debug_putch((char)va_arg(args, uint64_t));
-            break;
-        case 's':
-            debug_puts(va_arg(args, char*));
-            break;
-        default:
-            debug_putch('%');
-            fmt--;
-    }
-
-    if(base)
-    {
-        uintmax_t number = va_arg(args, uintmax_t);
-        char buf[128];
-        num2str(buf, number, base);
-        if(padwidth > strlen(buf))
-            for(size_t i = 0; i < (padwidth - strlen(buf)); i++)
-                debug_putch(padchar);
-        debug_puts(buf);
-    }
-
-    fmt++;
-    debug_vprintf(fmt, args);
-}
-
-void debug_printf(char *fmt, ...)
-{
-    va_list args;
-    va_start(args, fmt);
-    debug_vprintf(fmt, args);
-    va_end(args);
-}

src/kernel/boot/kmain.c

@@ -6,6 +6,8 @@
 #include <multiboot.h>
 #include <interrupts.h>
 #include <stdlib.h>
+#include <stdio.h>
+
 
 struct kernel_boot_data_st kernel_boot_data;
 

src/kernel/drivers/terminal/terminal.c

@@ -1,6 +1,9 @@
 #include <stdint.h>
 #include <string.h>
+#include <sys/uio.h>
 #include <terminal.h>
+#include <musl-glue.h>
+#include <debug.h>
 
 #define FRAMEBUFFER 0x1
 #define EGA_TEXT 0x2
@@ -15,23 +18,6 @@ uint8_t format = 0x7;
 
 static int terminal_type;
 
-void terminal_init(){
-    struct fbinfo *fbinfo = kernel_boot_data.fbinfo;
-    terminal_type = fbinfo->framebuffer_type;
-
-    switch(terminal_type)
-    {
-        case FRAMEBUFFER:
-            framebuffer_init(fbinfo);
-            fbterm_init(&kernel_fb);
-            break;
-        case EGA_TEXT:
-            vga_init(fbinfo);
-            break;
-    }
-}
-
-
 static void scroll()
 {
     while(cursor >= VGA_SIZE)
@@ -42,7 +28,7 @@ static void scroll()
     }
 }
 
-void terminal_write(char c)
+static void terminal_write(char c)
 {
     int doflush = 0;
     switch(c)
@@ -69,3 +55,61 @@ void terminal_write(char c)
             break;
     }
 }
+
+static void terminal_putsn(char *s, size_t n)
+{
+    while(n--)
+        terminal_write(*s++);
+}
+
+long k_ioctl(long fd, long cmd, long arg3, long, long, long)
+{
+    if(fd == 1 && cmd == 0x5413) {
+        struct {
+            unsigned short ws_row;
+            unsigned short ws_col;
+            unsigned short ws_xp;
+            unsigned short ws_yp;
+        } *wsz = (void *)arg3;
+        wsz->ws_row = 24;
+        wsz->ws_col = 80;
+        return 0;
+    }
+    long retval = -1;
+    PANIC("Unknown IOCTL request: fd: %d, command: %x\n", fd, cmd);
+    return retval;
+}
+
+long k_writev(long fd, long iov, long iovcnt, long, long, long)
+{
+    if(fd == 1)
+    {
+        size_t len = 0;
+        struct iovec *v = (void *) iov;
+        for(int i = 0; i < iovcnt; i++)
+        {
+            terminal_putsn(v[i].iov_base, v[i].iov_len);
+            len += v[i].iov_len;
+        }
+        return len;
+    }
+    long retval = 0;
+    PANIC("Unknown writev request: fd: %d\n", fd);
+    return retval;
+}
+
+void terminal_init(){
+    struct fbinfo *fbinfo = kernel_boot_data.fbinfo;
+    terminal_type = fbinfo->framebuffer_type;
+
+    switch(terminal_type)
+    {
+        case FRAMEBUFFER:
+            framebuffer_init(fbinfo);
+            fbterm_init(&kernel_fb);
+            break;
+        case EGA_TEXT:
+            vga_init(fbinfo);
+            break;
+    }
+}

src/kernel/include/debug.h

@@ -1,8 +1,9 @@
 #pragma once
 #include <stddef.h>
+#include <stdio.h>
 
 #ifndef NDEBUG
-#define debug(...) debug_printf(__VA_ARGS__)
+#define debug(...) printf(__VA_ARGS__)
 #define debug_info(...) \
     do{debug("[INFO]    "); debug(__VA_ARGS__);}while(0)
 #define debug_ok(...) \
@@ -25,9 +26,9 @@
 
 #define PANIC(...) \
     do { \
-        debug_printf("\n\nKERNEL PANIC!\n%s:%d\n", __FILE__, __LINE__); \
-        debug_printf(__VA_ARGS__); \
-        debug_printf("\n"); \
+        debug("\n\nKERNEL PANIC!\n%s:%d\n", __FILE__, __LINE__); \
+        debug(__VA_ARGS__); \
+        debug("\n"); \
         volatile int _override = 0; \
         while(1) { \
             __asm__("panic_breakpoint_" S__LINE__ ":"); \
@@ -35,8 +36,3 @@
         } \
     }while(0)
     
-// boot/debug.c
-void debug_printf(char *fmt, ...);
-void debug_puts(char *s);
-void debug_putsn(char *s, size_t n);
-void debug_putsh(char c);

src/kernel/include/memory.h

@@ -40,9 +40,6 @@
     uint64_t pmm_alloc();
     uint64_t pmm_calloc();
 
-    // memory/kbrk.c
-    long kbrk(long brk, long, long, long, long, long);
-
     // Link.ld
     extern int kernel_start, kernel_end;
 

src/kernel/include/musl-glue.h

@@ -1,8 +1,17 @@
 #pragma once
 
 #define SYSCALL_BRK 12
+#define SYSCALL_IOCTL 16
+#define SYSCALL_WRITEV 20
 
 typedef long (*syscall_handler)(long, long, long, long, long, long);
 
 // lib/musl-glue.c
 syscall_handler set_syscall_handler(long num, syscall_handler handler);
+
+// drivers/terminal/terminal.c
+long k_ioctl(long fd, long cmd, long arg3, long, long, long);
+long k_writev(long fd, long iov, long iovcnt, long, long, long);
+
+// memory/kbrk.c
+long k_brk(long brk, long, long, long, long, long);

src/kernel/include/terminal.h

@@ -14,7 +14,6 @@ struct vga_cell {
 
 // drivers/terminal/terminal.c
 void terminal_init();
-void terminal_write(char c);
 
 // drivers/terminal/vga.c
 void vga_init();

src/kernel/lib/musl-glue.c

@@ -1,7 +1,11 @@
 #include <musl-glue.h>
 #include <debug.h>
 
-syscall_handler syscall_handlers[440];
+syscall_handler syscall_handlers[440] = {
+    [SYSCALL_BRK] = &k_brk,
+    [SYSCALL_IOCTL] = &k_ioctl,
+    [SYSCALL_WRITEV] = &k_writev,
+};
 
 syscall_handler set_syscall_handler(long num, syscall_handler handler)
 {

src/kernel/memory/kbrk.c

@@ -3,7 +3,7 @@
 
 static long _brk = KERNEL_BRK0;
 
-long kbrk(long brk, long, long, long, long, long)
+long k_brk(long brk, long, long, long, long, long)
 {
     if(brk)
     {

src/kernel/memory/memory.c

@@ -38,6 +38,4 @@ void memory_init()
             pmm_free(p);
         }
     }
-
-    set_syscall_handler(SYSCALL_BRK, &kbrk);
 }