From 521d01e8ad87e931af3e9a763cc84a6cf7fe5ee3 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Sun, 5 Dec 2021 09:47:21 -0800
Subject: Feat: basic string and memory functions

Continue filling out the basic standard lib functions.
Included prototypes of the str* and mem* families.
Plan to add e(str|mem) and n(str|mem) variants as well.
---
 src/base/mem/compare.c | 12 ++++++++++++
 src/base/mem/copy.c    |  2 +-
 src/base/mem/move.c    |  2 +-
 src/base/mem/rules.mk  | 10 +---------
 src/base/mem/set.c     |  2 +-
 src/base/mem/set32.c   | 15 +++++++++++++++
 src/base/mem/set64.c   |  4 ++--
 7 files changed, 33 insertions(+), 14 deletions(-)
 create mode 100644 src/base/mem/compare.c
 create mode 100644 src/base/mem/set32.c

(limited to 'src/base/mem')

diff --git a/src/base/mem/compare.c b/src/base/mem/compare.c
new file mode 100644
index 0000000..a2cdd1f
--- /dev/null
+++ b/src/base/mem/compare.c
@@ -0,0 +1,12 @@
+#include <u.h>
+
+int
+mem·compare(void *qry, void *ref, uintptr size)
+{
+    intptr i;
+    char *q=qry, *r=ref;
+    for(i=0; i < size; i++)
+        if(q[i] != r[i])
+            return q[i] - r[i];
+    return 0;
+}
diff --git a/src/base/mem/copy.c b/src/base/mem/copy.c
index 5ce4f90..001d5e5 100644
--- a/src/base/mem/copy.c
+++ b/src/base/mem/copy.c
@@ -1,7 +1,7 @@
 #include "internal.h"
 
 int
-mem·copy(void *dst, void *src, uintptr len)
+mem·copy(void *dst, uintptr len, void *src)
 {
     char *d, *s;
     if((long)len < 0)
diff --git a/src/base/mem/move.c b/src/base/mem/move.c
index 5ad4074..7f6e906 100644
--- a/src/base/mem/move.c
+++ b/src/base/mem/move.c
@@ -1,7 +1,7 @@
 #include "internal.h"
 
 int
-mem·move(void *dst, void *src, uintptr len)
+mem·move(void *dst, uintptr len, void *src)
 {
     char *d, *s;
     if((long)len < 0)
diff --git a/src/base/mem/rules.mk b/src/base/mem/rules.mk
index a4d9f10..9f07d34 100644
--- a/src/base/mem/rules.mk
+++ b/src/base/mem/rules.mk
@@ -1,9 +1 @@
-SRCS_$(d)+=\
-	$(d)/mem/arena.c\
-	$(d)/mem/buffer.c\
-	$(d)/mem/interface.c\
-	$(d)/mem/set.c\
-	$(d)/mem/set64.c\
-	$(d)/mem/findc.c\
-	$(d)/mem/copy.c\
-	$(d)/mem/move.c
+SRCS_$(d)+=$(wildcard $(d)/mem/*.c)
diff --git a/src/base/mem/set.c b/src/base/mem/set.c
index 2e296be..cb19cae 100644
--- a/src/base/mem/set.c
+++ b/src/base/mem/set.c
@@ -1,7 +1,7 @@
 #include "internal.h"
 
 int
-mem·set(void *addr, int c, uintptr len)
+mem·set(void *addr, uintptr len, int c)
 {
     char *a = addr;
 
diff --git a/src/base/mem/set32.c b/src/base/mem/set32.c
new file mode 100644
index 0000000..21ad64f
--- /dev/null
+++ b/src/base/mem/set32.c
@@ -0,0 +1,15 @@
+#include "internal.h"
+
+int
+mem·set32(void *dst, uintptr size, uint32 val)
+{
+    intptr i;
+
+    for(i = 0; i < (size & (~3)); i += 4)
+        mem·copy((byte*)dst + i, 4, &val);
+
+    for(; i < size; i++)
+        ((byte*)dst)[i] = ((byte*)&val)[i&3];
+
+    return 0;
+}
diff --git a/src/base/mem/set64.c b/src/base/mem/set64.c
index 7000866..669c70c 100644
--- a/src/base/mem/set64.c
+++ b/src/base/mem/set64.c
@@ -1,12 +1,12 @@
 #include "internal.h"
 
 int
-mem·set64(void *dst, uint64 val, uintptr size)
+mem·set64(void *dst, uintptr size, uint64 val)
 {
     intptr i;
 
     for(i = 0; i < (size & (~7)); i += 8)
-        memcpy((byte*)dst + i, &val, 8);
+        mem·copy((byte*)dst + i, 8, &val);
 
     for(; i < size; i++)
         ((byte*)dst)[i] = ((byte*)&val)[i&7];
-- 
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