sys/src/libbio/bgetrune.c

   1 #include        <u.h>
   2 #include        <libc.h>
   3 #include        <bio.h>
   4
   5 long
   6 Bgetrune(Biobufhdr *bp)
   7 {
   8         int c, i;
   9         Rune rune;
  10         char str[UTFmax];
  11
  12         c = Bgetc(bp);
  13         if(c < Runeself) {              /* one char */
  14                 bp->runesize = 1;
  15                 return c;
  16         }
  17         str[0] = c;
  18
  19         for(i=1;;) {
  20                 c = Bgetc(bp);
  21                 if(c < 0)
  22                         return c;
  23                 str[i++] = c;
  24
  25                 if(fullrune(str, i)) {
  26                         bp->runesize = chartorune(&rune, str);
  27                         while(i > bp->runesize) {
  28                                 Bungetc(bp);
  29                                 i--;
  30                         }
  31                         return rune;
  32                 }
  33         }
  34 }
  35
  36 int
  37 Bungetrune(Biobufhdr *bp)
  38 {
  39
  40         if(bp->state == Bracteof)
  41                 bp->state = Bractive;
  42         if(bp->state != Bractive)
  43                 return Beof;
  44         bp->icount -= bp->runesize;
  45         bp->runesize = 0;
  46         return 1;
  47 }