Imported pristine psxsdk-20190410 from official repo

1 files changed, 41 insertions, 0 deletions

diff --git a/libpsx/src/libc/strings.c b/libpsx/src/libc/strings.c
new file mode 100644
index 0000000..76a5f9f
--- /dev/null
+++ b/libpsx/src/libc/strings.c
@@ -0,0 +1,41 @@
+#include <stdlib.h>
+#include <strings.h>
+#include <stdint.h>
+
+#define ffs_func(func_name, type) \
+\
+int func_name(type value) \
+{ \
+	int i; \
+	int nbits = sizeof(type) * 8;\
+	\
+	for(i = 0; i < nbits && !(value & ((type)1 << i) ); i++);\
+	\
+	return (i == nbits) ? 0 : (i + 1);\
+}
+
+ffs_func(ffs, int);
+ffs_func(ffsl, long);
+ffs_func(ffsll, long long);
+
+#define popcount_func(func_name, type)	\
+\
+unsigned int func_name(type value) \
+{ \
+	int i, bitcnt; \
+	int nbits = sizeof(type) * 8; \
+	\
+	for(i = 0, bitcnt = 0; i < nbits; i++) \
+	{\
+		if( value & ((type)1 << i) )\
+			bitcnt++;\
+	}\
+	\
+	return bitcnt;\
+}
+
+popcount_func(popcount, unsigned int);
+popcount_func(popcountl, unsigned long);
+popcount_func(popcountll, unsigned long long);
+popcount_func(popcount32, uint32_t);
+popcount_func(popcount64, uint64_t);