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1.1 root 1: /*
2: * libc/stdio/_fgetb.c
3: * C Standard I/O Library internals.
4: * Buffered input: read a buffer.
5: */
6:
7: #include <stdio.h>
8: #include <errno.h>
9:
10: extern int _fputt();
11:
12: int
13: _fgetb(fp) register FILE *fp;
14: {
15: register int n, oerrno;
16:
17: if (fflush(fp))
18: return EOF;
19: if (stdout->_pt==&_fputt) /* special kludge */
20: fflush(stdout);
21: oerrno = errno; /* save old errno */
22: errno = 0;
23: n = fp->_cc = -read(fileno(fp), fp->_dp, _ep(fp) - fp->_dp);
24: if (errno == 0)
25: errno = oerrno; /* preserve errno if no error */
26: if (n == 1) { /* read() returned -1, i.e. error */
27: if (errno != EINTR)
28: fp->_ff |= _FERR;
29: fp->_cc = 0;
30: return EOF;
31: } else if (n == 0) { /* read() returned 0, i.e. EOF */
32: fp->_ff |= _FEOF;
33: return EOF;
34: } else { /* success */
35: fp->_dp -= fp->_cc++;
36: return (*fp->_cp++);
37: }
38: }
39:
40: /* end of libc/stdio/_fgetb.c */
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