scc

commit 4ac2c9373b1004d4176807d0b106c97cbdab8163
parent 949d7de20391cbcb0a6ce10cf2080abb7914b6b5
Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date:   Tue, 25 Mar 2025 20:56:32 +0100

libc/wchar: Add wcsncat()

Diffstat:
M
src/libc/objs/common-objs.mk
 | 
1
+
A
src/libc/wchar/wcsncat.c
 | 
18
++++++++++++++++++
M
tests/libc/execute/.gitignore
 | 
1
+
A
tests/libc/execute/0056-wcsncat.c
 | 
58
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
tests/libc/execute/libc-tests.lst
 | 
1
+

5 files changed, 79 insertions(+), 0 deletions(-)
diff --git a/src/libc/objs/common-objs.mk b/src/libc/objs/common-objs.mk
@@ -132,6 +132,7 @@ COMMON_OBJS =\
 	wchar/wcsncmp.$O\
 	wchar/wcscpy.$O\
 	wchar/wcscat.$O\
+	wchar/wcsncat.$O\
 	wchar/wcsrtombs.$O\
 	wchar/wcwidth.$O\
 	wchar/wmemchr.$O\
diff --git a/src/libc/wchar/wcsncat.c b/src/libc/wchar/wcsncat.c
@@ -0,0 +1,18 @@
+#include <wchar.h>
+
+#undef wcsncat
+
+wchar_t *
+wcsncat(wchar_t *restrict s1, const wchar_t *restrict s2, size_t n)
+{
+	wchar_t *ret;
+
+	for (ret = s1; *s1; ++s1)
+		;
+	while (n-- > 0 && *s2)
+		*s1++ = *s2++;
+	*s1 = '\0';
+
+	return ret;
+
+}
diff --git a/tests/libc/execute/.gitignore b/tests/libc/execute/.gitignore
@@ -52,4 +52,5 @@
 0053-wmemcmp
 0054-wcsncpy
 0055-wcscat
+0056-wcsncat
 test.log
diff --git a/tests/libc/execute/0056-wcsncat.c b/tests/libc/execute/0056-wcsncat.c
@@ -0,0 +1,58 @@
+#include <assert.h>
+#include <stdio.h>
+#include <wchar.h>
+
+/*
+output:
+testing
+test1
+test2
+test3
+test4
+test5
+done
+end:
+*/
+
+int
+main()
+{
+	wchar_t *s, buf[40], buf2[40];
+
+	puts("testing");
+
+	puts("test1");
+	wcscpy(buf, L"01234");
+	s = wcsncat(buf, L"567", 8);
+	assert(s == buf);
+	assert(!wcscmp(s, L"01234567"));
+
+	puts("test2");
+	wcscpy(buf, L"01234");
+	s = wcsncat(buf, L"567", 2);
+	assert(s == buf);
+	assert(!wcscmp(s, L"0123456"));
+
+	puts("test3");
+	wcscpy(buf, L"01234");
+	wmemcpy(buf2, L"567", 3);
+	s = wcsncat(buf, buf2, 3);
+	assert(s == buf);
+	assert(!wcscmp(s, L"01234567"));
+
+	puts("test4");
+	wcscpy(buf, L"01234");
+	s = wcsncat(buf, L"", 7);
+	assert(s == buf);
+	assert(!wcscmp(s, L"01234"));
+
+	puts("test5");
+	wcscpy(buf, L"01234");
+	s = wcsncat(buf, L"", 0);
+	assert(s == buf);
+	assert(!wcscmp(s, L"01234"));
+
+	puts("done");
+
+	return 0;
+}
diff --git a/tests/libc/execute/libc-tests.lst b/tests/libc/execute/libc-tests.lst
@@ -51,3 +51,4 @@
 0053-wmemcmp
 0054-wcsncpy
 0055-wcscat
+0056-wcsncat