54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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/* Do not include the above headers in the example.
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*/
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wchar_t *
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mbstouwcs (const char *s)
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{
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/* Include the null terminator in the conversion. */
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size_t len = strlen (s) + 1;
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wchar_t *result = reallocarray (NULL, len, sizeof (wchar_t));
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if (result == NULL)
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return NULL;
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wchar_t *wcp = result;
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mbstate_t state;
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memset (&state, '\0', sizeof (state));
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while (true)
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{
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wchar_t wc;
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size_t nbytes = mbrtowc (&wc, s, len, &state);
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if (nbytes == 0)
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{
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/* Terminate the result string. */
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*wcp = L'\0';
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break;
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}
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else if (nbytes == (size_t) -2)
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{
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/* Truncated input string. */
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errno = EILSEQ;
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free (result);
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return NULL;
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}
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else if (nbytes == (size_t) -1)
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{
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/* Some other error (including EILSEQ). */
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free (result);
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return NULL;
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}
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else
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{
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/* A character was converted. */
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*wcp++ = towupper (wc);
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len -= nbytes;
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s += nbytes;
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}
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}
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return result;
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}
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