scc

commit c4b7399c26bf3040f33b4760e162495d74d85d73
parent 534e0b91e27ad3cb37404d696cd1c0044a8ebe18
Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date:   Sun,  4 Jan 2026 20:17:51 +0100

libc/wchar: Add btowc()

Diffstat:
M
src/libc/objs/common-objs.mk
 | 
1
+
M
src/libc/wchar/Makefile
 | 
1
+
A
src/libc/wchar/btowc.c
 | 
14
++++++++++++++
M
tests/libc/execute/.gitignore
 | 
1
+
A
tests/libc/execute/0065-btowc.c
 | 
22
++++++++++++++++++++++
M
tests/libc/execute/libc-tests.lst
 | 
1
+

6 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/src/libc/objs/common-objs.mk b/src/libc/objs/common-objs.mk
@@ -121,6 +121,7 @@ COMMON_OBJS =\
 	time/strftime.$O\
 	time/tz.$O\
 	wchar/_validutf8.$O\
+	wchar/btowc.$O\
 	wchar/fputwc.$O\
 	wchar/mbrlen.$O\
 	wchar/mbrtowc.$O\
diff --git a/src/libc/wchar/Makefile b/src/libc/wchar/Makefile
@@ -4,6 +4,7 @@ include $(PROJECTDIR)/scripts/rules.mk
 include ../rules.mk
 
 OBJS =\
+	btowc.$O\
 	fputwc.$O\
 	mbrlen.$O\
 	mbrtowc.$O\
diff --git a/src/libc/wchar/btowc.c b/src/libc/wchar/btowc.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <wchar.h>
+
+#undef btowc
+
+wint_t
+btowc(int ch)
+{
+	unsigned char c = ch;
+
+	if (ch == EOF || c >= 128)
+		return WEOF;
+	return ch;
+}
diff --git a/tests/libc/execute/.gitignore b/tests/libc/execute/.gitignore
@@ -63,3 +63,4 @@
 0063-wcspbrk
 0064-wcstok
 test.log
+0065-btowc
diff --git a/tests/libc/execute/0065-btowc.c b/tests/libc/execute/0065-btowc.c
@@ -0,0 +1,22 @@
+#include <assert.h>
+#include <stdio.h>
+#include <wchar.h>
+
+/*
+output:
+testing
+done
+end:
+*/
+
+int
+main(void)
+{
+	puts("testing");
+	assert(btowc('a') == 'a');
+	assert(btowc(EOF) == -1);
+	assert(btowc('\x99') == -1);
+	puts("done");
+
+	return 0;
+}
diff --git a/tests/libc/execute/libc-tests.lst b/tests/libc/execute/libc-tests.lst
@@ -61,3 +61,4 @@
 0062-wcscspn
 0063-wcspbrk
 0064-wcstok
+0065-btowc