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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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