Feat: added buffered io from plan9

As we no longer have the FILE type, we need to buffer our reading and
writing so that we don't have to make so many syscalls. The API is nice
so that we can buffer other readers. We will update it so that it eats
io·Readers/io·Writers.

7 files changed, 71 insertions, 7 deletions

diff --git a/src/base/mem/arena.c b/src/base/mem/arena.c
index b2ce044..37e7b56 100644
--- a/src/base/mem/arena.c
+++ b/src/base/mem/arena.c
@@ -25,15 +25,13 @@ struct mem·Arena
     struct Block first;
 };
 
-static
-void*
+static void*
 ·arenaalloc(void *heap, uint n, ulong size)
 {
     return mem·arenaalloc(heap, n, size);
 }
 
-static
-void
+static void
 ·arenafree(void *heap, void *ptr)
 {
     /* no-op */
@@ -45,8 +43,7 @@ mem·Allocator mem·ArenaAllocator = {
 };
 
 
-static
-void
+static void
 grow(mem·Arena *a, vlong min)
 {
     uintptr size;
diff --git a/src/base/mem/copy.c b/src/base/mem/copy.c
new file mode 100644
index 0000000..5ce4f90
--- /dev/null
+++ b/src/base/mem/copy.c
@@ -0,0 +1,14 @@
+#include "internal.h"
+
+int
+mem·copy(void *dst, void *src, uintptr len)
+{
+    char *d, *s;
+    if((long)len < 0)
+        return 1;
+
+    d=dst, s=src;
+    while(len-- > 0)
+        *d++ = *s++;
+    return 0;
+}
diff --git a/src/base/mem/findc.c b/src/base/mem/findc.c
new file mode 100644
index 0000000..d3215c5
--- /dev/null
+++ b/src/base/mem/findc.c
@@ -0,0 +1,14 @@
+#include "internal.h"
+
+void *
+mem·findc(void *addr, uintptr len, int c)
+{
+    uchar *a = addr;
+
+    c &= 0xFF;
+    while(len-- > 0){
+        if(*a++ == c)
+            return a-1;
+    }
+    return nil;
+}
diff --git a/src/base/mem/move.c b/src/base/mem/move.c
new file mode 100644
index 0000000..5ad4074
--- /dev/null
+++ b/src/base/mem/move.c
@@ -0,0 +1,22 @@
+#include "internal.h"
+
+int
+mem·move(void *dst, void *src, uintptr len)
+{
+    char *d, *s;
+    if((long)len < 0)
+        return 1;
+
+    d=dst, s=src;
+    if((s < d) && (s+len > d))
+        goto aliased;
+    while(len-- > 0)
+        *d++ = *s++;
+    return 0;
+
+aliased:
+    d+=len, s+=len;
+    while(len-- > 0)
+        *--d = *--s;
+    return 0;
+}
diff --git a/src/base/mem/rules.mk b/src/base/mem/rules.mk
index b912d0c..fda54e1 100644
--- a/src/base/mem/rules.mk
+++ b/src/base/mem/rules.mk
@@ -2,4 +2,7 @@ SRCS_$(d)+=\
 	$(d)/mem/arena.c\
 	$(d)/mem/buffer.c\
 	$(d)/mem/interface.c\
+	$(d)/mem/set.c\
 	$(d)/mem/set64.c\
+	$(d)/mem/copy.c\
+	$(d)/mem/move.c
diff --git a/src/base/mem/set.c b/src/base/mem/set.c
new file mode 100644
index 0000000..2e296be
--- /dev/null
+++ b/src/base/mem/set.c
@@ -0,0 +1,12 @@
+#include "internal.h"
+
+int
+mem·set(void *addr, int c, uintptr len)
+{
+    char *a = addr;
+
+    while(len-- > 0)
+        *a++ = c;
+
+    return 0;
+}
diff --git a/src/base/mem/set64.c b/src/base/mem/set64.c
index 464b3ad..7000866 100644
--- a/src/base/mem/set64.c
+++ b/src/base/mem/set64.c
@@ -1,6 +1,6 @@
 #include "internal.h"
 
-void
+int
 mem·set64(void *dst, uint64 val, uintptr size)
 {
     intptr i;
@@ -10,4 +10,6 @@ mem·set64(void *dst, uint64 val, uintptr size)
 
     for(; i < size; i++)
         ((byte*)dst)[i] = ((byte*)&val)[i&7];
+
+    return 0;
 }