libc/wchar: Add wcsrchr() - scc - simple c99 compiler
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---
(DIR) commit 1b9b9b8ada90d264546916bc65e2867ba3a0fca3
(DIR) parent 8a6918d48bb8ecbc1c2af2c72b2e89a3df3a999b
(HTM) Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date: Tue, 25 Mar 2025 21:32:52 +0100
libc/wchar: Add wcsrchr()
Diffstat:
M src/libc/objs/common-objs.mk | 1 +
A src/libc/wchar/wcsrchr.c | 16 ++++++++++++++++
M tests/libc/execute/.gitignore | 1 +
A tests/libc/execute/0058-wcsrchr.c | 27 +++++++++++++++++++++++++++
M tests/libc/execute/libc-tests.lst | 1 +
5 files changed, 46 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/src/libc/objs/common-objs.mk b/src/libc/objs/common-objs.mk
@@ -134,6 +134,7 @@ COMMON_OBJS =\
wchar/wcscat.$O\
wchar/wcsncat.$O\
wchar/wcschr.$O\
+ wchar/wcsrchr.$O\
wchar/wcsrtombs.$O\
wchar/wcwidth.$O\
wchar/wmemchr.$O\
(DIR) diff --git a/src/libc/wchar/wcsrchr.c b/src/libc/wchar/wcsrchr.c
@@ -0,0 +1,16 @@
+#include <wchar.h>
+
+#undef wcsrchr
+
+wchar_t *
+wcsrchr(const wchar_t *s, wchar_t c)
+{
+ wchar_t *t;
+
+ for (t = (wchar_t *) s; *t; ++t)
+ ;
+ while (t > s && *t != c)
+ --t;
+
+ return (*t == c) ? t : NULL;
+}
(DIR) diff --git a/tests/libc/execute/.gitignore b/tests/libc/execute/.gitignore
@@ -54,4 +54,5 @@
0055-wcscat
0056-wcsncat
0057-wcschr
+0058-wcsrchr
test.log
(DIR) diff --git a/tests/libc/execute/0058-wcsrchr.c b/tests/libc/execute/0058-wcsrchr.c
@@ -0,0 +1,27 @@
+#include <assert.h>
+#include <stdio.h>
+#include <wchar.h>
+
+/*
+output:
+testing
+done
+end:
+*/
+
+int
+main()
+{
+ wchar_t buf[] = L"012321";
+
+ puts("testing");
+ assert(wcsrchr(buf, '1') == buf+5);
+ assert(wcsrchr(buf, '0') == buf);
+ assert(wcsrchr(buf, '3') == buf+3);
+ assert(wcsrchr("", '0') == NULL);
+ assert(wcsrchr(buf, 'a') == NULL);
+ assert(wcsrchr(buf, 0) == buf+6);
+ puts("done");
+
+ return 0;
+}
(DIR) diff --git a/tests/libc/execute/libc-tests.lst b/tests/libc/execute/libc-tests.lst
@@ -53,3 +53,4 @@
0055-wcscat
0056-wcsncat
0057-wcschr
+0058-wcsrchr