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       __putc.c - scc - simple c99 compiler
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       ---
       __putc.c (781B)
       ---
            1 #include <errno.h>
            2 #include <stdio.h>
            3 #include <stdlib.h>
            4 
            5 #include "../libc.h"
            6 
            7 static void
            8 cleanup(void)
            9 {
           10         fflush(NULL);
           11 }
           12 
           13 int
           14 __putc(int ch, FILE *fp)
           15 {
           16         if (fp->flags & _IOERR)
           17                 return EOF;
           18 
           19         if (fp->flags & _IOREAD) {
           20                 fp->flags |= _IOERR;
           21                 errno = EBADF;
           22                 return EOF;
           23         }
           24 
           25         if (fp->flags & _IOSTRG)
           26                 return ch & 0xFF;
           27 
           28         if (fp->buf == NULL && _allocbuf(fp))
           29                 return EOF;
           30         _flushall = cleanup;
           31 
           32         if (fp->flags & _IOLBF) {
           33                 if (fp->wp == fp->lp && _flsbuf(fp))
           34                         return EOF;
           35                 *fp->wp++ = ch;
           36                 if (ch == '\n' && _flsbuf(fp))
           37                         return EOF;
           38         } else if (fp->flags & _IOFBF) {
           39                 if (_flsbuf(fp))
           40                         return EOF;
           41                 *fp->wp++ = ch;
           42                 fp->rp = fp->buf + fp->len;
           43         } else {
           44                 *fp->wp++ = ch;
           45                 if (_flsbuf(fp))
           46                         return EOF;
           47         }
           48 
           49         fp->flags |= _IOWRITE;
           50         return ch & 0xFF;
           51 }