libc/wchar: Add wcsncpy() - scc - simple c99 compiler
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---
(DIR) commit 7aa86bd1b38fb9ddd568ed8c13f534a274f50fbb
(DIR) parent 7dcb0d9d9eee6306f01cf4788b8eef1fa9baa9c7
(HTM) Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date: Tue, 25 Mar 2025 20:34:38 +0100
libc/wchar: Add wcsncpy()
Diffstat:
M src/libc/objs/common-objs.mk | 1 +
A src/libc/wchar/wcsncpy.c | 18 ++++++++++++++++++
M tests/libc/execute/.gitignore | 1 +
A tests/libc/execute/0054-wcsncpy.c | 48 +++++++++++++++++++++++++++++++
M tests/libc/execute/libc-tests.lst | 1 +
5 files changed, 69 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/src/libc/objs/common-objs.mk b/src/libc/objs/common-objs.mk
@@ -135,6 +135,7 @@ COMMON_OBJS =\
wchar/wcwidth.$O\
wchar/wmemchr.$O\
wchar/wmemcpy.$O\
+ wchar/wcsncpy.$O\
wchar/wmemmove.$O\
wchar/wmemset.$O\
wchar/wmemcmp.$O\
(DIR) diff --git a/src/libc/wchar/wcsncpy.c b/src/libc/wchar/wcsncpy.c
@@ -0,0 +1,18 @@
+#include <wchar.h>
+
+#undef wcsncpy
+
+wchar_t *
+wcsncpy(wchar_t *restrict s1, const wchar_t *restrict s2, size_t n)
+{
+ wchar_t *ret = s1;
+
+ for (; n > 0 && *s2; --n)
+ *s1++ = *s2++;
+
+ while (n-- > 0)
+ *s1++ = '\0';
+
+ return ret;
+
+}
(DIR) diff --git a/tests/libc/execute/.gitignore b/tests/libc/execute/.gitignore
@@ -50,4 +50,5 @@
0052-wmemset
0051-wmemmove
0053-wmemcmp
+0054-wcsncpy
test.log
(DIR) diff --git a/tests/libc/execute/0054-wcsncpy.c b/tests/libc/execute/0054-wcsncpy.c
@@ -0,0 +1,48 @@
+#include <assert.h>
+#include <stdio.h>
+#include <wchar.h>
+
+#define SIZ 6
+
+/*
+output:
+testing
+test1
+test2
+test3
+done
+end:
+*/
+
+int
+main()
+{
+ wchar_t *s, buf[SIZ];
+ wchar_t abc[] = {'a', 'b', 'c'};
+
+ puts("testing");
+
+ puts("test1");
+ wmemset(buf, '0', SIZ);
+ s = wcsncpy(buf, abc, SIZ);
+ assert(s == buf);
+ assert(!wmemcmp(s, abc, SIZ));
+
+ puts("test2");
+ wmemset(buf, '0', SIZ);
+ s = wcsncpy(buf, (wchar_t[]) {0}, SIZ);
+ assert(s == buf);
+ assert(!wmemcmp(s, (wchar_t[SIZ]) {0}, SIZ));
+
+ puts("test3");
+ wmemset(buf, '0', SIZ);
+ s = wcsncpy(buf, (wchar_t[]) {0}, 1);
+ assert(s == buf);
+ assert(!wmemcmp(s,
+ (wchar_t[SIZ]) {'\0', '0', '0', '0', '0', '0'},
+ SIZ));
+
+ puts("done");
+
+ return 0;
+}
(DIR) diff --git a/tests/libc/execute/libc-tests.lst b/tests/libc/execute/libc-tests.lst
@@ -49,3 +49,4 @@
0051-wmemmove
0052-wmemset
0053-wmemcmp
+0054-wcsncpy