From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/c/string%2Fmultibyte%2Fbtowc.html | 57 +++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 devdocs/c/string%2Fmultibyte%2Fbtowc.html (limited to 'devdocs/c/string%2Fmultibyte%2Fbtowc.html') diff --git a/devdocs/c/string%2Fmultibyte%2Fbtowc.html b/devdocs/c/string%2Fmultibyte%2Fbtowc.html new file mode 100644 index 00000000..a30db92f --- /dev/null +++ b/devdocs/c/string%2Fmultibyte%2Fbtowc.html @@ -0,0 +1,57 @@ +

btowc

Defined in header <wchar.h> 
wint_t btowc( int c );
+		 (since C95)

Widens a single-byte character c (reinterpreted as unsigned char) to its wide character equivalent.

+

Most multibyte character encodings use single-byte codes to represent the characters from the ASCII character set. This function may be used to convert such characters to wchar_t.

+

Parameters

+ +
c - single-byte character to widen

Return value

WEOF if c is EOF

+

wide character representation of c if (unsigned char)c is a valid single-byte character in the initial shift state, WEOF otherwise.

+

Example

#include <stdio.h>
+#include <wchar.h>
+#include <locale.h>
+#include <assert.h>
+ 
+void try_widen(unsigned char c)
+{
+    wint_t w = btowc(c);
+    if(w != WEOF)
+        printf("The single-byte character %#x widens to %#x\n", c, w);
+    else
+        printf("The single-byte character %#x failed to widen\n", c);
+}
+ 
+int main(void)
+{
+    char *loc = setlocale(LC_ALL, "lt_LT.iso88594");
+    assert(loc);
+    printf("In Lithuanian ISO-8859-4 locale:\n");
+    try_widen('A');
+    try_widen('\xdf'); // German letter ß (U+00df) in ISO-8859-4
+    try_widen('\xf9'); // Lithuanian letter ų (U+0173) in ISO-8859-4
+ 
+    setlocale(LC_ALL, "lt_LT.utf8");
+    printf("In Lithuanian UTF-8 locale:\n");
+    try_widen('A');
+    try_widen('\xdf');
+    try_widen('\xf9');
+}

Possible output:

+
In Lithuanian ISO-8859-4 locale:
+The single-byte character 0x41 widens to 0x41
+The single-byte character 0xdf widens to 0xdf
+The single-byte character 0xf9 widens to 0x173
+In Lithuanian UTF-8 locale:
+The single-byte character 0x41 widens to 0x41
+The single-byte character 0xdf failed to widen
+The single-byte character 0xf9 failed to widen

References

See also

+ +
+
(C95)
 narrows a wide character to a single-byte narrow character, if possible
(function)
C++ documentation for btowc
+

+ © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
+ https://en.cppreference.com/w/c/string/multibyte/btowc +

+
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