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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH 17/30] lib: wchar: add wctomb and mbtowc
Date: Mon, 22 Nov 2021 09:47:19 +0100	[thread overview]
Message-ID: <20211122084732.2597109-18-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20211122084732.2597109-1-a.fatoum@pengutronix.de>

We currently convert wchar_t to char by truncating to 8-bit.
In future, we may want to do UTF-16 to UTF-8 conversion.
Prepare for this by wrapping each conversion direction in a function.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 include/wchar.h |  5 +++++
 lib/wchar.c     | 22 ++++++++++++++++++++--
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/include/wchar.h b/include/wchar.h
index b601cc62079b..fb9b127a8c04 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -17,4 +17,9 @@ char *strdup_wchar_to_char(const wchar_t *src);
 
 size_t wcslen(const wchar_t *s);
 
+#define MB_CUR_MAX 4
+
+int mbtowc(wchar_t *pwc, const char *s, size_t n);
+int wctomb(char *s, wchar_t wc);
+
 #endif /* __WCHAR_H */
diff --git a/lib/wchar.c b/lib/wchar.c
index 4d49431e8653..3be228b5a77a 100644
--- a/lib/wchar.c
+++ b/lib/wchar.c
@@ -44,12 +44,30 @@ wchar_t *strdup_wchar(const wchar_t *src)
 	return tmp;
 }
 
+int mbtowc(wchar_t *pwc, const char *s, size_t n)
+{
+	if (!s)
+		return 0; /* we don't mantain a non-trivial shift state */
+
+	if (n < 1)
+		return -1;
+
+	*pwc = *s;
+	return 1;
+}
+
+int wctomb(char *s, wchar_t wc)
+{
+	*s = wc & 0xFF;
+	return 1;
+}
+
 char *strcpy_wchar_to_char(char *dst, const wchar_t *src)
 {
 	char *ret = dst;
 
 	while (*src)
-		*dst++ = *src++ & 0xff;
+		wctomb(dst++, *src++);
 
 	*dst = 0;
 
@@ -61,7 +79,7 @@ wchar_t *strcpy_char_to_wchar(wchar_t *dst, const char *src)
 	wchar_t *ret = dst;
 
 	while (*src)
-		*dst++ = *src++;
+		mbtowc(dst++, src++, 1);
 
 	*dst = 0;
 
-- 
2.30.2


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  parent reply	other threads:[~2021-11-22  8:53 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-22  8:47 [PATCH 00/30] efi: refactor for upcoming loader support Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 01/30] fs: remove useless AT_FDCWD references Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 02/30] fs: remove unused struct node_d in struct dir Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 03/30] block : efi: rename driver variable from efi_fs_driver to efi_bio_driver Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 04/30] include: <linux/types.h>: wrap in #ifndef __ASSEMBLY__ Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 05/30] hw_random: stm32: propagate error codes from rng read Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 06/30] efi: align LOAD_FILE_PROTOCOL_GUID's name with other PROTOCOL_GUIDs Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 07/30] asm-generic: move sync_caches_for_execution declaration to <asm/cache.h> Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 08/30] common: move EFI code into new efi/ top level directory Ahmad Fatoum
2021-11-23  8:55   ` Jules Maselbas
2021-11-22  8:47 ` [PATCH 09/30] serial: efi-stdio: move efi-stdio.h header to central location Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 10/30] efi: use SPDX-License-Identifier where appropriate Ahmad Fatoum
2021-11-23  8:52   ` Jules Maselbas
2021-11-22  8:47 ` [PATCH 11/30] drivers: efi: move Kconfig options to new menu Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 12/30] efi: factor out errno translation Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 13/30] efi: rename <efi/efi.h> to <efi/efi-payload.h> Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 14/30] efi: centralize efivarfs_parse_filename Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 15/30] kbuild: force 16-bit wchar_t treewide Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 16/30] include: <linux/nls.h>: remove duplicate wchar_t typedef Ahmad Fatoum
2021-11-22  8:47 ` Ahmad Fatoum [this message]
2021-11-22  8:47 ` [PATCH 18/30] lib: implement wcsnlen Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 19/30] vsprintf: add optional support for %ls format modifier Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 20/30] libfile: null-terminate read_file of wchar_t buffer Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 21/30] commands: echo: add wide file output via wecho alias Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 22/30] efi: make efi_main __noreturn Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 23/30] efi: define and use new EFI_ERROR_MASK macro Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 24/30] common: move CONFIG_ELF into General Settings Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 25/30] efi: don't zero executable buffer before freeing Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 26/30] partitions: efi: move header to central location Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 27/30] efi: print early efi_main string on CONFIG_DEBUG_LL=y Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 28/30] ARM64: board-dt-2nd: remove no longer needed noinline function split Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 29/30] bus: acpi: register bus even if without ACPI EFI table Ahmad Fatoum
2021-11-22  8:47 ` [PATCH 30/30] efi: guid: fix typos Ahmad Fatoum
2021-11-25  7:44 ` [PATCH 00/30] efi: refactor for upcoming loader support Sascha Hauer

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