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    The following form allows you to view linux man pages.

    Command:

    mbstowcs

    
    
    

    SYNOPSIS

           #include <stdlib.h>
    
           size_t mbstowcs(wchar_t *dest, const char *src, size_t n);
    
    
    

    DESCRIPTION

           If  dest  is  not  NULL, the mbstowcs() function converts the multibyte
           string src to a wide-character string starting at dest.  At most n wide
           characters  are  written to dest.  The conversion starts in the initial
           state.  The conversion can stop for three reasons:
    
           1. An invalid multibyte sequence has been encountered.   In  this  case
              (size_t) -1 is returned.
    
           2. n  non-L'\0' wide characters have been stored at dest.  In this case
              the number of wide characters written to dest is returned,  but  the
              shift state at this point is lost.
    
           3. The  multibyte  string  has been completely converted, including the
              terminating null wide character ('\0').  In this case the number  of
              wide characters written to dest, excluding the terminating null wide
              character, is returned.
    
           The programmer must ensure that there is room for at least n wide char-
           acters at dest.
    
           If  dest  is  NULL, n is ignored, and the conversion proceeds as above,
           except that the converted wide characters are not written out  to  mem-
           ory, and that no length limit exists.
    
           In  order  to avoid the case 2 above, the programmer should make sure n
           is greater than or equal to mbstowcs(NULL,src,0)+1.
    
    
    

    RETURN VALUE

           The mbstowcs() function returns the number of wide characters that make
           up  the  converted part of the wide-character string, not including the
           terminating null wide character.  If an invalid multibyte sequence  was
           encountered, (size_t) -1 is returned.
    
    
    

    CONFORMING TO

           C99.
    
    
    

    NOTES

           The behavior of mbstowcs() depends on the LC_CTYPE category of the cur-
           rent locale.
    
           The function mbsrtowcs(3) provides a better interface to the same func-
           tionality.
    
    
    

    EXAMPLE

           The program below illustrates the use of mbstowcs(), as well as some of
           the wider character classification functions.  An example  run  is  the
    
       Program source
           #include <locale.h>
           #include <wchar.h>
           #include <stdio.h>
           #include <string.h>
           #include <stdlib.h>
    
           int
           main(int argc, char *argv[])
           {
               size_t mbslen;      /* Number of multibyte characters in source */
               wchar_t *wcs;       /* Pointer to converted wide character string */
               wchar_t *wp;
    
               if (argc < 3) {
                   fprintf(stderr, "Usage: %s <locale> <string>\n", argv[0]);
                   exit(EXIT_FAILURE);
               }
    
               /* Apply the specified locale */
    
               if (setlocale(LC_ALL, argv[1]) == NULL) {
                   perror("setlocale");
                   exit(EXIT_FAILURE);
               }
    
               /* Calculate the length required to hold argv[2] converted to
                  a wide character string */
    
               mbslen = mbstowcs(NULL, argv[2], 0);
               if (mbslen == (size_t) -1) {
                   perror("mbstowcs");
                   exit(EXIT_FAILURE);
               }
    
               /* Describe the source string to the user */
    
               printf("Length of source string (excluding terminator):\n");
               printf("    %zu bytes\n", strlen(argv[2]));
               printf("    %zu multibyte characters\n\n", mbslen);
    
               /* Allocate wide character string of the desired size.  Add 1
                  to allow for terminating null wide character (L'\0'). */
    
               wcs = calloc(mbslen + 1, sizeof(wchar_t));
               if (wcs == NULL) {
                   perror("calloc");
                   exit(EXIT_FAILURE);
               }
    
               /* Convert the multibyte character string in argv[2] to a
                   printf("    %lc ", (wint_t) *wp);
    
                   if (!iswalpha(*wp))
                       printf("!");
                   printf("alpha ");
    
                   if (iswalpha(*wp)) {
                       if (iswupper(*wp))
                           printf("upper ");
    
                       if (iswlower(*wp))
                           printf("lower ");
                   }
    
                   putchar('\n');
               }
    
               exit(EXIT_SUCCESS);
           }
    
    
    

    SEE ALSO

           mblen(3), mbsrtowcs(3), mbtowc(3), wctomb(3), wcstombs(3)
    
    
    

    GNU 2014-03-18 MBSTOWCS(3)

    
    
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