mbstowcs(3) Library Functions Manual mbstowcs(3) NOM mbstowcs - Convertir une chaine de caracteres multioctets en une chaine de caracteres larges BIBLIOTHEQUE Bibliotheque C standard (libc, -lc) SYNOPSIS #include size_t mbstowcs(wchar_t dest[restrict .dsize], const char *restrict src, size_t dsize); DESCRIPTION If dest is not NULL, convert the multibyte string src to a wide-character string starting at dest. At most dsize wide characters are written to dest. The sequence of characters in the string src shall begin in the initial shift state. The conversion can stop for three reasons: - Une sequence multioctet incorrecte a ete rencontree. Dans ce cas, elle renvoie (size_t) -1. - dsize 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. - La chaine multioctet a ete completement convertie, y compris le caractere NULL final (<< \0 >>). Dans ce cas, le nombre de caracteres larges ecrits dans dest, sans compter le caractere large NULL final, est renvoye. If dest is NULL, dsize is ignored, and the conversion proceeds as above, except that the converted wide characters are not written out to memory, and that no length limit exists. In order to avoid the case 2 above, the programmer should make sure dsize is greater than or equal to mbstowcs(NULL,src,0)+1. The programmer must ensure that there is room for at least dsize wide characters at dest. VALEUR RENVOYEE 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. ATTRIBUTS Pour une explication des termes utilises dans cette section, consulter attributes(7). +---------------------------------+--------------------------+---------+ |Interface | Attribut | Valeur | +---------------------------------+--------------------------+---------+ |mbstowcs() | Securite des threads | MT-Safe | +---------------------------------+--------------------------+---------+ VERSIONS La fonction mbsrtowcs(3) fournit une meilleure interface pour la meme fonctionnalite. STANDARDS C11, POSIX.1-2008. HISTORIQUE POSIX.1-2001, C99. NOTES Le comportement de mbstowcs() depend de la categorie LC_CTYPE de la localisation en cours. EXEMPLES Le programme ci-dessous illustre l'utilisation de mbstowcs(), ainsi que de certaines fonctions de classification pour les caracteres larges. Voici un exemple de son execution. $ ./t_mbstowcs de_DE.UTF-8 Grusse! Length of source string (excluding terminator): 8 bytes 6 multibyte characters Wide character string is: Grusse! (6 characters) G alpha upper r alpha lower u alpha lower ss alpha lower e alpha lower ! !alpha Source du programme #include #include #include #include #include #include int main(int argc, char *argv[]) { size_t mbslen; /* Number of multibyte characters in source */ wchar_t *wcs; /* Pointer to converted wide character string */ if (argc < 3) { fprintf(stderr, "Usage: %s \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(*wcs)); if (wcs == NULL) { perror("calloc"); exit(EXIT_FAILURE); } /* Convert the multibyte character string in argv[2] to a wide character string. */ if (mbstowcs(wcs, argv[2], mbslen + 1) == (size_t) -1) { perror("mbstowcs"); exit(EXIT_FAILURE); } printf("Wide character string is: %ls (%zu characters)\n", wcs, mbslen); /* Now do some inspection of the classes of the characters in the wide character string. */ for (wchar_t *wp = wcs; *wp != 0; wp++) { 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); } VOIR AUSSI mblen(3), mbsrtowcs(3), mbtowc(3), wcstombs(3), wctomb(3) TRADUCTION La traduction francaise de cette page de manuel a ete creee par Christophe Blaess , Stephan Rafin , Thierry Vignaud , Francois Micaux, Alain Portal , Jean-Philippe Guerard , Jean-Luc Coulon (f5ibh) , Julien Cristau , Thomas Huriaux , Nicolas Francois , Florentin Duneau , Simon Paillard , Denis Barbier et David Prevot Cette traduction est une documentation libre ; veuillez vous reporter a la GNU General Public License version 3 concernant les conditions de copie et de distribution. 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