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Annotation of src/usr.bin/rs/utf8.c, Revision 1.1

1.1     ! schwarze    1: /*
        !             2:  * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
        !             3:  *
        !             4:  * Permission to use, copy, modify, and distribute this software for any
        !             5:  * purpose with or without fee is hereby granted, provided that the above
        !             6:  * copyright notice and this permission notice appear in all copies.
        !             7:  *
        !             8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !             9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            15:  */
        !            16:
        !            17: #include <err.h>
        !            18: #include <stdlib.h>
        !            19: #include <string.h>
        !            20: #include <wchar.h>
        !            21:
        !            22: int
        !            23: mbsavis(char** outp, const char *mbs)
        !            24: {
        !            25:        const char *src;  /* Iterate mbs. */
        !            26:        char     *dst;  /* Iterate *outp. */
        !            27:        wchar_t   wc;
        !            28:        int       total_width;  /* Display width of the whole string. */
        !            29:        int       width;  /* Display width of a single Unicode char. */
        !            30:        int       len;  /* Length in bytes of UTF-8 encoded string. */
        !            31:
        !            32:        len = strlen(mbs);
        !            33:        if ((*outp = malloc(len + 1)) == NULL)
        !            34:                err(1, NULL);
        !            35:
        !            36:        if (MB_CUR_MAX == 1) {
        !            37:                memcpy(*outp, mbs, len + 1);
        !            38:                return len;
        !            39:        }
        !            40:
        !            41:        src = mbs;
        !            42:        dst = *outp;
        !            43:        total_width = 0;
        !            44:        while (*src != '\0') {
        !            45:                if ((len = mbtowc(&wc, src, MB_CUR_MAX)) == -1) {
        !            46:                        total_width++;
        !            47:                        *dst++ = '?';
        !            48:                        src++;
        !            49:                } else if ((width = wcwidth(wc)) == -1) {
        !            50:                        total_width++;
        !            51:                        *dst++ = '?';
        !            52:                        src += len;
        !            53:                } else {
        !            54:                        total_width += width;
        !            55:                        while (len-- > 0)
        !            56:                                *dst++ = *src++;
        !            57:                }
        !            58:        }
        !            59:        *dst = '\0';
        !            60:        return total_width;
        !            61: }