libc/wchar: Add wcsstr() - scc - simple c99 compiler
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---
(DIR) commit 09245abd272928c778c739e2402517a464b1a678
(DIR) parent 1b9b9b8ada90d264546916bc65e2867ba3a0fca3
(HTM) Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date: Tue, 25 Mar 2025 21:44:30 +0100
libc/wchar: Add wcsstr()
Diffstat:
M src/libc/objs/common-objs.mk | 1 +
A src/libc/wchar/wcsstr.c | 22 ++++++++++++++++++++++
M tests/libc/execute/.gitignore | 1 +
A tests/libc/execute/0059-wcsstr.c | 32 +++++++++++++++++++++++++++++++
M tests/libc/execute/libc-tests.lst | 1 +
5 files changed, 57 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/wcsncat.$O\
wchar/wcschr.$O\
wchar/wcsrchr.$O\
+ wchar/wcsstr.$O\
wchar/wcsrtombs.$O\
wchar/wcwidth.$O\
wchar/wmemchr.$O\
(DIR) diff --git a/src/libc/wchar/wcsstr.c b/src/libc/wchar/wcsstr.c
@@ -0,0 +1,22 @@
+#include <wchar.h>
+
+#undef wcsstr
+
+wchar_t *
+wcsstr(const wchar_t *s1, const wchar_t *s2)
+{
+ wchar_t *p = (wchar_t *) s1;
+ wchar_t c = *s2;
+ size_t len;
+
+ if ((len = wcslen(s2)) == 0)
+ return p;
+
+ for ( ; p = wcschr(p, c); ++p) {
+ if (!wcsncmp(p, s2, len))
+ return p;
+ }
+
+ return NULL;
+}
+
(DIR) diff --git a/tests/libc/execute/.gitignore b/tests/libc/execute/.gitignore
@@ -55,4 +55,5 @@
0056-wcsncat
0057-wcschr
0058-wcsrchr
+0059-wcsstr
test.log
(DIR) diff --git a/tests/libc/execute/0059-wcsstr.c b/tests/libc/execute/0059-wcsstr.c
@@ -0,0 +1,32 @@
+#include <assert.h>
+#include <stdio.h>
+#include <wchar.h>
+
+/*
+output:
+testing
+done
+end:
+*/
+
+int
+main()
+{
+ wchar_t buf[30] = L"abc";
+
+ puts("testing");
+ assert(wcsstr(buf, L"abc") == buf);
+ assert(wcsstr(buf, L"bc") == buf + 1);
+ assert(wcsstr(buf, L"c") == buf + 2);
+ assert(wcsstr(buf, L"d") == NULL);
+ wcscpy(buf, L"ababc");
+ assert(wcsstr(buf, L"abc") == buf+2);
+ assert(wcsstr(L"", L"abc") == NULL);
+ assert(wcsstr(buf, L"") == buf);
+ buf[0] = '\0';
+ assert(wcsstr(buf, L"") == buf);
+ puts("done");
+
+ return 0;
+}
+
(DIR) diff --git a/tests/libc/execute/libc-tests.lst b/tests/libc/execute/libc-tests.lst
@@ -54,3 +54,4 @@
0056-wcsncat
0057-wcschr
0058-wcsrchr
+0059-wcsstr