mbsinit
From cppreference.com
| Defined in header <wchar.h>
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| int mbsinit( const mbstate_t* ps); |
(since C95) | |
If ps is not a null pointer, the mbsinit function determines whether the pointed-to mbstate_t object describes the initial conversion state.
Contents |
[edit] Notes
Although a zero-initialized mbstate_t always represents the initial conversion state, there may be other values of mbstate_t that also represent the initial conversion state.
[edit] Parameters
| ps | - | pointer to the mbstate_t object to examine |
[edit] Return value
0 if ps is not a null pointer and does not represent the initial conversion state, nonzero value otherwise.
[edit] Example
Run this code
#include <locale.h> #include <string.h> #include <stdio.h> #include <wchar.h> int main(void) { // allow mbrlen() to work with UTF-8 multibyte encoding setlocale(LC_ALL, "en_US.utf8"); // UTF-8 narrow multibyte encoding const char* str = u8"水"; // or u8"\u6c34" or "\xe6\xb0\xb4" static mbstate_t mb; // zero-initialize (void)mbrlen(&str[0], 1, &mb); if (!mbsinit(&mb)) { printf("After processing the first 1 byte of %s,\n" "the conversion state is not initial\n\n", str); } (void)mbrlen(&str[1], strlen(str), &mb); if (mbsinit(&mb)) { printf("After processing the remaining 2 bytes of %s,\n" "the conversion state is initial conversion state\n", str); } }
Output:
After processing the first 1 byte of 水, the conversion state is not initial After processing the remaining 2 bytes of 水, the conversion state is initial conversion state
[edit] References
- C11 standard (ISO/IEC 9899:2011):
- 7.29.6.2.1 The mbsinit function (p: 441-442)
- C99 standard (ISO/IEC 9899:1999):
- 7.24.6.2.1 The mbsinit function (p: 387-388)
[edit] See also
| (C95) |
conversion state information necessary to iterate multibyte character strings (class) |
| C++ documentation for mbsinit
| |
