scc

commit 01921365fc084e3b592c00bdd090d0d457502904
parent e5399b363bcd8af06edc6bb4ba9edb034bcbe728
Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date:   Fri, 21 Mar 2025 19:21:44 +0100

libc/wchar: Add wcsncmp()

Diffstat:
M
src/libc/objs/common-objs.mk
 | 
1
+
A
src/libc/wchar/wcsncmp.c
 | 
18
++++++++++++++++++
M
tests/libc/execute/.gitignore
 | 
1
+
A
tests/libc/execute/0046-wcsncmp.c
 | 
30
++++++++++++++++++++++++++++++
M
tests/libc/execute/libc-tests.lst
 | 
1
+

5 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/src/libc/objs/common-objs.mk b/src/libc/objs/common-objs.mk
@@ -128,6 +128,7 @@ COMMON_OBJS =\
 	wchar/wcrtomb.$O\
 	wchar/wcslen.$O\
 	wchar/wcscmp.$O\
+	wchar/wcsncmp.$O\
 	wchar/wcsrtombs.$O\
 	wchar/wcwidth.$O\
 	wchar/putwc.$O\
diff --git a/src/libc/wchar/wcsncmp.c b/src/libc/wchar/wcsncmp.c
@@ -0,0 +1,18 @@
+#include <wchar.h>
+
+#undef wcsncmp
+
+int
+wcsncmp(const wchar_t *s1, const wchar_t *s2, size_t n)
+{
+	unsigned long l1, l2;
+
+	for ( ; n > 0 && *s1 == *s2; --n)
+		++s1, ++s2;
+
+	if (n == 0)
+		return 0;
+	l1 = *s1, l2 = *s2;
+
+	return l1 - l2;
+}
diff --git a/tests/libc/execute/.gitignore b/tests/libc/execute/.gitignore
@@ -41,4 +41,5 @@
 0041-mbrlen
 0044-wcslen
 0045-wcscmp
+0046-wcsncmp
 test.log
diff --git a/tests/libc/execute/0046-wcsncmp.c b/tests/libc/execute/0046-wcsncmp.c
@@ -0,0 +1,30 @@
+#include <assert.h>
+#include <stdio.h>
+#include <wchar.h>
+
+/*
+output:
+testing
+done
+end:
+*/
+
+int
+main(void)
+{
+	wchar_t t1[] = {0};
+	wchar_t t2[] = {0};
+	wchar_t t3[] = {0x31, 0};
+	wchar_t t4[] = {0x31, 0};
+	wchar_t t5[] = {0x32, 0x33, 0};
+
+	puts("testing");
+	assert(wcsncmp(t1, t1, 0) == 0);
+	assert(wcsncmp(t1, t2, 0) == 0);
+	assert(wcsncmp(t3, t4, 1) == 0);
+	assert(wcsncmp(t3, t5, 1) < 0);
+	assert(wcsncmp(t5, t3, 1) > 0);
+	puts("done");
+
+	return 0;
+}
diff --git a/tests/libc/execute/libc-tests.lst b/tests/libc/execute/libc-tests.lst
@@ -40,3 +40,4 @@
 0041-mbrlen
 0044-wcslen
 0045-wcscmp
+0046-wcsncmp