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Annotation of embedaddon/lrzsz/src/zreadline.c, revision 1.1

1.1     ! misho       1: /*
        !             2:   zreadline.c - line reading stuff for lrzsz
        !             3:   Copyright (C) until 1998 Chuck Forsberg (OMEN Technology Inc)
        !             4:   Copyright (C) 1994 Matt Porter
        !             5:   Copyright (C) 1996, 1997 Uwe Ohse
        !             6: 
        !             7:   This program is free software; you can redistribute it and/or modify
        !             8:   it under the terms of the GNU General Public License as published by
        !             9:   the Free Software Foundation; either version 2, or (at your option)
        !            10:   any later version.
        !            11: 
        !            12:   This program is distributed in the hope that it will be useful,
        !            13:   but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15:   GNU General Public License for more details.
        !            16: 
        !            17:   You should have received a copy of the GNU General Public License
        !            18:   along with this program; if not, write to the Free Software
        !            19:   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
        !            20:   02111-1307, USA.
        !            21: 
        !            22:   originally written by Chuck Forsberg
        !            23: */
        !            24: /* once part of lrz.c, taken out to be useful to lsz.c too */
        !            25: 
        !            26: #include "zglobal.h"
        !            27: 
        !            28: #include <stdlib.h>
        !            29: #include <stdio.h>
        !            30: #include <signal.h>
        !            31: #include <ctype.h>
        !            32: #include <errno.h>
        !            33: 
        !            34: #include "error.h"
        !            35: 
        !            36: 
        !            37: /* Ward Christensen / CP/M parameters - Don't change these! */
        !            38: #define TIMEOUT (-2)
        !            39: 
        !            40: static size_t readline_readnum;
        !            41: static int readline_fd;
        !            42: static char *readline_buffer;
        !            43: int readline_left=0;
        !            44: char *readline_ptr;
        !            45: 
        !            46: static RETSIGTYPE
        !            47: zreadline_alarm_handler(int dummy LRZSZ_ATTRIB_UNUSED)
        !            48: {
        !            49:        /* doesn't need to do anything */
        !            50: }
        !            51: 
        !            52: /*
        !            53:  * This version of readline is reasonably well suited for
        !            54:  * reading many characters.
        !            55:  *
        !            56:  * timeout is in tenths of seconds
        !            57:  */
        !            58: int 
        !            59: readline_internal(unsigned int timeout)
        !            60: {
        !            61: 
        !            62:        if (!no_timeout)
        !            63:        {
        !            64:                unsigned int n;
        !            65:                n = timeout/10;
        !            66:                if (n < 2 && timeout!=1)
        !            67:                        n = 3;
        !            68:                else if (n==0)
        !            69:                        n=1;
        !            70:                if (Verbose > 5)
        !            71:                        vstringf("Calling read: alarm=%d  Readnum=%d ",
        !            72:                          n, readline_readnum);
        !            73:                signal(SIGALRM, zreadline_alarm_handler); 
        !            74:                alarm(n);
        !            75:        }
        !            76:        else if (Verbose > 5)
        !            77:                vstringf("Calling read: Readnum=%d ",
        !            78:                  readline_readnum);
        !            79: 
        !            80:        readline_ptr=readline_buffer;
        !            81:        readline_left=read(readline_fd, readline_ptr, readline_readnum);
        !            82:        if (!no_timeout)
        !            83:                alarm(0);
        !            84:        if (readline_left>0 && bytes_per_error) {
        !            85:                static long ct=0;
        !            86:                static int mod=1;
        !            87:                ct+=readline_left;
        !            88:                while (ct>bytes_per_error) {
        !            89:                        readline_ptr[ct % bytes_per_error]^=mod;
        !            90:                        ct-=bytes_per_error;
        !            91:                        mod++;
        !            92:                        if (mod==256)
        !            93:                                mod=1;
        !            94:                }
        !            95:        }
        !            96:        if (Verbose > 5) {
        !            97:                vstringf("Read returned %d bytes\n", readline_left);
        !            98:                if (readline_left==-1)
        !            99:                        vstringf("errno=%d:%s\n", errno,strerror(errno));
        !           100:                if (Verbose > 9 && readline_left>0) {
        !           101:                        int i,j;
        !           102:                        j=readline_left > 48 ? 48 : readline_left;
        !           103:                        vstring("    ");
        !           104:                        for (i=0;i<j;i++) {
        !           105:                                if (i%24==0 && i)
        !           106:                                        vstring("\n    ");
        !           107:                                vstringf("%02x ", readline_ptr[i] & 0377);
        !           108:                        }
        !           109:                        vstringf("\n");
        !           110:                }
        !           111:        }
        !           112:        if (readline_left < 1)
        !           113:                return TIMEOUT;
        !           114:        --readline_left;
        !           115:        return (*readline_ptr++ & 0377);
        !           116: }
        !           117: 
        !           118: 
        !           119: 
        !           120: void
        !           121: readline_setup(int fd, size_t readnum, size_t bufsize)
        !           122: {
        !           123:        readline_fd=fd;
        !           124:        readline_readnum=readnum;
        !           125:        readline_buffer=malloc(bufsize > readnum ? bufsize : readnum);
        !           126:        if (!readline_buffer)
        !           127:                error(1,0,_("out of memory"));
        !           128: }
        !           129: 
        !           130: void
        !           131: readline_purge(void)
        !           132: {
        !           133:        readline_left=0;
        !           134:        return;
        !           135: }
        !           136: