From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/c/string%2Fmultibyte%2Fmbrtoc32.html | 77 ---------------------------- 1 file changed, 77 deletions(-) delete mode 100644 devdocs/c/string%2Fmultibyte%2Fmbrtoc32.html (limited to 'devdocs/c/string%2Fmultibyte%2Fmbrtoc32.html') diff --git a/devdocs/c/string%2Fmultibyte%2Fmbrtoc32.html b/devdocs/c/string%2Fmultibyte%2Fmbrtoc32.html deleted file mode 100644 index f67e7de6..00000000 --- a/devdocs/c/string%2Fmultibyte%2Fmbrtoc32.html +++ /dev/null @@ -1,77 +0,0 @@ -

mbrtoc32

Defined in header <uchar.h> 
size_t mbrtoc32( char32_t restrict * pc32, const char * restrict s,
-                 size_t n, mbstate_t * restrict ps );
-		 (since C11)

Converts a single code point from its narrow multibyte character representation to its variable-length 32-bit wide character representation (but typically, UTF-32).

-

If s is not a null pointer, inspects at most n bytes of the multibyte character string, beginning with the byte pointed to by s to determine the number of bytes necessary to complete the next multibyte character (including any shift sequences, and taking into account the current multibyte conversion state *ps). If the function determines that the next multibyte character in s is complete and valid, converts it to the corresponding 32-bit wide character and stores it in *pc32 (if pc32 is not null).

-

If the multibyte character in *s corresponds to a multi-char32_t sequence (not possible with UTF-32), then after the first call to this function, *ps is updated in such a way that the next calls to mbrtoc32 will write out the additional char32_t, without considering *s.

-

If s is a null pointer, the values of n and pc32 are ignored and the call is equivalent to mbrtoc32(NULL, "", 1, ps).

-

If the wide character produced is the null character, the conversion state *ps represents the initial shift state.

-

If the macro __STDC_UTF_32__ is defined, the 32-bit encoding used by this function is UTF-32; otherwise, it is implementation-defined. The macro is always defined and the encoding is always UTF-32.(since C23) In any case, the multibyte character encoding used by this function is specified by the currently active C locale.

-

Parameters

- - - - -
pc32 - pointer to the location where the resulting 32-bit wide character will be written
s - pointer to the multibyte character string used as input
n - limit on the number of bytes in s that can be examined
ps - pointer to the conversion state object used when interpreting the multibyte string

Return value

The first of the following that applies:

-

Example

#include <stdio.h>
-#include <locale.h>
-#include <string.h>
-#include <uchar.h>
-#include <assert.h>
- 
-int main(void)
-{
-    setlocale(LC_ALL, "en_US.utf8");
-    char in[] = u8"zß水🍌"; // or "z\u00df\u6c34\U0001F34C"
-    const size_t in_size = sizeof in / sizeof *in;
- 
-    printf("Processing %zu UTF-8 code units: [ ", in_size);
-    for (size_t i = 0; i < in_size; ++i)
-        printf("0x%02x ", (unsigned char)in[i]);
- 
-    puts("]");
- 
-    char32_t out[in_size];
-    char32_t *p_out = out;
-    char *p_in = in, *end = in + in_size;
-    mbstate_t state;
-    memset(&state, 0, sizeof(state));
-    size_t rc;
-    while ((rc = mbrtoc32(p_out, p_in, end - p_in, &state)))
-    {
-        assert(rc != (size_t)-3); // no surrogate pairs in UTF-32
-        if (rc == (size_t)-1) break; // invalid input
-        if (rc == (size_t)-2) break; // truncated input
-        p_in += rc;
-        ++p_out;
-    }
- 
-    size_t out_size = p_out+1 - out;
-    printf("into %zu UTF-32 code units: [ ", out_size);
-    for (size_t i = 0; i < out_size; ++i)
-        printf("0x%08X ", out[i]);
- 
-    puts("]");
-}

Output:

-
Processing 11 UTF-8 code units: [ 0x7a 0xc3 0x9f 0xe6 0xb0 0xb4 0xf0 0x9f 0x8d 0x8c 0x00 ]
-into 5 UTF-32 code units: [ 0x0000007A 0x000000DF 0x00006C34 0x0001F34C 0x00000000 ]

References

See also

- -
-
(C11)
 converts a 32-bit wide character to narrow multibyte string
(function)
C++ documentation for mbrtoc32
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/string/multibyte/mbrtoc32 -

-
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