libc/wchar: Add btowc() - scc - simple c99 compiler
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---
DIR commit c4b7399c26bf3040f33b4760e162495d74d85d73
DIR parent 534e0b91e27ad3cb37404d696cd1c0044a8ebe18
HTML 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(-)
---
DIR 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\
DIR 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\
DIR 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;
+}
DIR diff --git a/tests/libc/execute/.gitignore b/tests/libc/execute/.gitignore
@@ -63,3 +63,4 @@
0063-wcspbrk
0064-wcstok
test.log
+0065-btowc
DIR 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;
+}
DIR 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