src/multibyte/wcrtomb.c

   1 #include <stdlib.h>
   2 #include <wchar.h>
   3 #include <errno.h>
   4 #include "internal.h"
   5
   6 size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict st)
   7 {
   8         if (!s) return 1;
   9         if ((unsigned)wc < 0x80) {
  10                 *s = wc;
  11                 return 1;
  12         } else if (MB_CUR_MAX == 1) {
  13                 if (!IS_CODEUNIT(wc)) {
  14                         errno = EILSEQ;
  15                         return -1;
  16                 }
  17                 *s = wc;
  18                 return 1;
  19         } else if ((unsigned)wc < 0x800) {
  20                 *s++ = 0xc0 | (wc>>6);
  21                 *s = 0x80 | (wc&0x3f);
  22                 return 2;
  23         } else if ((unsigned)wc < 0xd800 || (unsigned)wc-0xe000 < 0x2000) {
  24                 *s++ = 0xe0 | (wc>>12);
  25                 *s++ = 0x80 | ((wc>>6)&0x3f);
  26                 *s = 0x80 | (wc&0x3f);
  27                 return 3;
  28         } else if ((unsigned)wc-0x10000 < 0x100000) {
  29                 *s++ = 0xf0 | (wc>>18);
  30                 *s++ = 0x80 | ((wc>>12)&0x3f);
  31                 *s++ = 0x80 | ((wc>>6)&0x3f);
  32                 *s = 0x80 | (wc&0x3f);
  33                 return 4;
  34         }
  35         errno = EILSEQ;
  36         return -1;
  37 }