lib/libc/locale/frune.c

   1 /*-
   2  * Copyright (c) 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Paul Borman at Krystal Technologies.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)frune.c  8.1 (Berkeley) 6/4/93
  37  */
  38
  39 #include <limits.h>
  40 #include <rune.h>
  41 #include <stddef.h>
  42 #include <stdio.h>
  43
  44 long
  45 fgetrune(fp)
  46         FILE *fp;
  47 {
  48         rune_t  r;
  49         int c, len;
  50         char buf[MB_LEN_MAX];
  51         char const *result;
  52
  53         len = 0;
  54         do {
  55                 if ((c = getc(fp)) == EOF) {
  56                         if (len)
  57                                 break;
  58                         return (EOF);
  59                 }
  60                 buf[len++] = c;
  61
  62                 if ((r = sgetrune(buf, len, &result)) != _INVALID_RUNE)
  63                         return (r);
  64         } while (result == buf && len < MB_LEN_MAX);
  65
  66         while (--len > 0)
  67                 ungetc(buf[len], fp);
  68         return (_INVALID_RUNE);
  69 }
  70
  71 int
  72 fungetrune(r, fp)
  73         rune_t r;
  74         FILE* fp;
  75 {
  76         int len;
  77         char buf[MB_LEN_MAX];
  78
  79         len = sputrune(r, buf, MB_LEN_MAX, 0);
  80         while (len-- > 0)
  81                 if (ungetc(buf[len], fp) == EOF)
  82                         return (EOF);
  83         return (0);
  84 }
  85
  86 int
  87 fputrune(r, fp)
  88         rune_t r;
  89         FILE *fp;
  90 {
  91         int i, len;
  92         char buf[MB_LEN_MAX];
  93
  94         len = sputrune(r, buf, MB_LEN_MAX, 0);
  95
  96         for (i = 0; i < len; ++i)
  97                 if (putc(buf[i], fp) == EOF)
  98                         return (EOF);
  99
 100         return (0);
 101 }