putty-source/utils/dup_wc_to_mb.c

/*
 * dup_wc_to_mb: memory-allocating wrapper on wc_to_mb.
 *
 * Also dup_wc_to_mb_c: same but you already know the length of the
 * string.
 */

#include <wchar.h>

#include "putty.h"
#include "misc.h"

char *dup_wc_to_mb_c(int codepage, int flags, const wchar_t *string, int len,
                     const char *defchr, struct unicode_data *ucsdata)
{
    size_t outsize = len+1;
    char *out = snewn(outsize, char);

    while (true) {
        size_t outlen = wc_to_mb(codepage, flags, string, len, out, outsize,
                                 defchr, ucsdata);
        /* We can only be sure we've consumed the whole input if the
         * output is not within a multibyte-character-length of the
         * end of the buffer! */
        if (outlen < outsize && outsize - outlen > MB_LEN_MAX) {
            out[outlen] = '\0';
            return out;
        }

        sgrowarray(out, outsize, outsize);
    }
}

char *dup_wc_to_mb(int codepage, int flags, const wchar_t *string,
                   const char *defchr, struct unicode_data *ucsdata)
{
    return dup_wc_to_mb_c(codepage, flags, string, wcslen(string),
                          defchr, ucsdata);
}