?? zread.c
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/* Copyright (C) 1999 Free Software Foundation, Inc. This file is part of GNU Bash, the Bourne Again SHell. Bash is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. Bash is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Bash; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */#include <config.h>#include <sys/types.h>#if defined (HAVE_UNISTD_H)# include <unistd.h>#endif#include <errno.h>#if !defined (errno)extern int errno;#endif#ifndef SEEK_CUR# define SEEK_CUR 1#endif/* Read LEN bytes from FD into BUF. Retry the read on EINTR. Any other error causes the loop to break. */intzread (fd, buf, len) int fd; char *buf; size_t len;{ int r; while ((r = read (fd, buf, len)) < 0 && errno == EINTR) ; return r;}/* Read LEN bytes from FD into BUF. Retry the read on EINTR, up to three interrupts. Any other error causes the loop to break. */#ifdef NUM_INTR# undef NUM_INTR#endif#define NUM_INTR 3intzread1 (fd, buf, len) int fd; char *buf; size_t len;{ int r, nintr; for (nintr = 0; ; ) { r = read (fd, buf, len); if (r >= 0) return r; if (r == -1 && errno == EINTR) { if (++nintr > NUM_INTR) return -1; continue; } return r; }}/* Read one character from FD and return it in CP. Return values are as in read(2). This does some local buffering to avoid many one-character calls to read(2), like those the `read' builtin performs. */static unsigned char lbuf[128];static int lind, lused;intzreadc (fd, cp) int fd; char *cp;{ int r; if (lind == lused || lused == 0) { lused = zread (fd, lbuf, sizeof (lbuf)); lind = 0; if (lused <= 0) return (lused); } if (cp) *cp = (char)lbuf[lind++]; return 1;}voidzreset (){ lind = lused = 0;}/* Sync the seek pointer for FD so that the kernel's idea of the last char read is the last char returned by zreadc. */voidzsyncfd (fd) int fd;{ int off; off = lused - lind; if (off > 0) lseek (fd, -off, SEEK_CUR); lused = lind = 0;}
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