Add optimized versions of musl libc string and memory comparison functions.

6 files changed, 48 insertions, 0 deletions

diff --git a/system/lib/libc.symbols b/system/lib/libc.symbols
index 6f80ef90..705b2c88 100644
--- a/system/lib/libc.symbols
+++ b/system/lib/libc.symbols
@@ -72,7 +72,12 @@
          W realloc_in_place
          T scalbn
          T scalbnl
+         T memcpy
          T strtod
+         T strcmp
+         T strncmp
+         T strcasecmp
+         T strncasecmp
          T strtod_l
          T strtof
          T strtof_l
diff --git a/system/lib/libc/musl/src/string/memcmp.c b/system/lib/libc/musl/src/string/memcmp.c
new file mode 100644
index 00000000..bdbce9f0
--- /dev/null
+++ b/system/lib/libc/musl/src/string/memcmp.c
@@ -0,0 +1,8 @@
+#include <string.h>
+
+int memcmp(const void *vl, const void *vr, size_t n)
+{
+	const unsigned char *l=vl, *r=vr;
+	for (; n && *l == *r; n--, l++, r++);
+	return n ? *l-*r : 0;
+}
diff --git a/system/lib/libc/musl/src/string/strcasecmp.c b/system/lib/libc/musl/src/string/strcasecmp.c
new file mode 100644
index 00000000..02fd5f8c
--- /dev/null
+++ b/system/lib/libc/musl/src/string/strcasecmp.c
@@ -0,0 +1,9 @@
+#include <strings.h>
+#include <ctype.h>
+
+int strcasecmp(const char *_l, const char *_r)
+{
+	const unsigned char *l=(void *)_l, *r=(void *)_r;
+	for (; *l && *r && (*l == *r || tolower(*l) == tolower(*r)); l++, r++);
+	return tolower(*l) - tolower(*r);
+}
diff --git a/system/lib/libc/musl/src/string/strcmp.c b/system/lib/libc/musl/src/string/strcmp.c
new file mode 100644
index 00000000..808bd837
--- /dev/null
+++ b/system/lib/libc/musl/src/string/strcmp.c
@@ -0,0 +1,7 @@
+#include <string.h>
+
+int strcmp(const char *l, const char *r)
+{
+	for (; *l==*r && *l; l++, r++);
+	return *(unsigned char *)l - *(unsigned char *)r;
+}
diff --git a/system/lib/libc/musl/src/string/strncasecmp.c b/system/lib/libc/musl/src/string/strncasecmp.c
new file mode 100644
index 00000000..24659721
--- /dev/null
+++ b/system/lib/libc/musl/src/string/strncasecmp.c
@@ -0,0 +1,10 @@
+#include <strings.h>
+#include <ctype.h>
+
+int strncasecmp(const char *_l, const char *_r, size_t n)
+{
+	const unsigned char *l=(void *)_l, *r=(void *)_r;
+	if (!n--) return 0;
+	for (; *l && *r && n && (*l == *r || tolower(*l) == tolower(*r)); l++, r++, n--);
+	return tolower(*l) - tolower(*r);
+}
diff --git a/system/lib/libc/musl/src/string/strncmp.c b/system/lib/libc/musl/src/string/strncmp.c
new file mode 100644
index 00000000..e228843f
--- /dev/null
+++ b/system/lib/libc/musl/src/string/strncmp.c
@@ -0,0 +1,9 @@
+#include <string.h>
+
+int strncmp(const char *_l, const char *_r, size_t n)
+{
+	const unsigned char *l=(void *)_l, *r=(void *)_r;
+	if (!n--) return 0;
+	for (; *l && *r && n && *l == *r ; l++, r++, n--);
+	return *l - *r;
+}