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       __getc.c - scc - simple c99 compiler
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       ---
       __getc.c (621B)
       ---
            1 #include <errno.h>
            2 #include <stdio.h>
            3 #include <stdlib.h>
            4 
            5 #include "../libc.h"
            6 #include "../syscall.h"
            7 
            8 int
            9 __getc(FILE *fp)
           10 {
           11         int cnt;
           12 
           13         if (fp->flags & (_IOEOF | _IOERR))
           14                 return EOF;
           15 
           16         if ((fp->flags & (_IOREAD | _IORW)) == 0) {
           17                 fp->flags |= _IOERR;
           18                 errno = EBADF;
           19                 return EOF;
           20         }
           21 
           22         if (fp->flags & _IOSTRG) {
           23                 fp->flags |= _IOEOF;
           24                 return EOF;
           25         }
           26 
           27         if (fp->buf == NULL && _allocbuf(fp))
           28                 return EOF;
           29 
           30         if ((cnt = _read(fp->fd, fp->buf, fp->len)) <= 0) {
           31                 fp->flags |= (cnt == 0) ? _IOEOF : _IOERR;
           32                 return EOF;
           33         }
           34 
           35         fp->flags |= _IOREAD;
           36         fp->rp = fp->buf;
           37         fp->wp = fp->buf + cnt;
           38 
           39         return *fp->rp++;
           40 }