9os

Experimental kernel using plan9 ideas for embedded device
git clone git://git.simple-cc.org/9os
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__putc.c (1133B)

      1 #include <errno.h>
      2 #include <stdio.h>
      3 #include <stdlib.h>
      4 
      5 #include "../libc.h"
      6 
      7 int
      8 fflush(FILE *fp)
      9 {
     10 	int err;
     11 
     12 	if (fp)
     13 		return _flsbuf(fp);
     14 
     15 	err = 0;
     16 	for (fp = __iob; fp < &__iob[FOPEN_MAX]; ++fp) {
     17 		if ((fp->flags & _IOWRITE) == 0 && _flsbuf(fp))
     18 			err = EOF;
     19 	}
     20 	return err;
     21 }
     22 
     23 static void
     24 cleanup(void)
     25 {
     26 	fflush(NULL);
     27 }
     28 
     29 int
     30 __putc(int ch, FILE *fp)
     31 {
     32 	static int first = 1;
     33 
     34 	if (fp->flags & _IOERR)
     35 		return EOF;
     36 
     37 	if (fp->flags & _IOREAD) {
     38 		fp->flags |= _IOERR;
     39 		errno = EBADF;
     40 		return EOF;
     41 	}
     42 
     43 	if (fp->flags & _IOSTRG) {
     44 		fp->flags |= _IOERR;
     45 		return EOF;
     46 	}
     47 
     48 	if (fp->buf == NULL && _allocbuf(fp))
     49 			return EOF;
     50 
     51 	if (first) {
     52 		if (atexit(cleanup)) {
     53 			fp->flags |= _IOERR;
     54 			errno = ENOMEM;
     55 			return EOF;
     56 		}
     57 		first = 0;
     58 	}
     59 
     60 	if (fp->flags & _IOLBF) {
     61 		if (fp->wp == fp->lp && _flsbuf(fp))
     62 			return EOF;
     63 		*fp->wp++ = ch;
     64 		if (ch == '\n' && _flsbuf(fp))
     65 			return EOF;
     66 	} else if (fp->flags & _IOFBF) {
     67 		if (_flsbuf(fp))
     68 			return EOF;
     69 		*fp->wp++ = ch;
     70 		fp->rp = fp->buf + fp->len;
     71 	} else {
     72 		*fp->wp++ = ch;
     73 		if (_flsbuf(fp))
     74 			return EOF;
     75 	}
     76 
     77 	fp->flags |= _IOWRITE;
     78 	return ch & 0xFF;
     79 }