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- /*
- Copyright (C) Andrew Tridgell 1996
- Copyright (C) Paul Mackerras 1996
-
- This program 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 of the License, or
- (at your option) any later version.
-
- This program 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 this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- /*
- Utilities used in rsync
-
- tridge, June 1996
- */
- #include "rsync.h"
-
- static int total_written = 0;
- static int total_read = 0;
-
- extern int verbose;
- extern int sparse_files;
-
- int write_total(void)
- {
- return total_written;
- }
-
- int read_total(void)
- {
- return total_read;
- }
-
- static int buffer_f_in = -1;
-
- void setup_nonblocking(int f_in,int f_out)
- {
- set_blocking(f_out,0);
- buffer_f_in = f_in;
- }
-
-
- static char *read_buffer = NULL;
- static char *read_buffer_p = NULL;
- static int read_buffer_len = 0;
- static int read_buffer_size = 0;
-
-
- /* This function was added to overcome a deadlock problem when using
- * ssh. It looks like we can't allow our receive queue to get full or
- * ssh will clag up. Uggh. */
- static void read_check(int f)
- {
- int n;
-
- if (read_buffer_len == 0) {
- read_buffer_p = read_buffer;
- }
-
- if ((n=num_waiting(f)) <= 0)
- return;
-
- if (read_buffer_p != read_buffer) {
- memmove(read_buffer,read_buffer_p,read_buffer_len);
- read_buffer_p = read_buffer;
- }
-
- if (n > (read_buffer_size - read_buffer_len)) {
- read_buffer_size += n;
- if (!read_buffer)
- read_buffer = (char *)malloc(read_buffer_size);
- else
- read_buffer = (char *)realloc(read_buffer,read_buffer_size);
- if (!read_buffer) out_of_memory("read check");
- read_buffer_p = read_buffer;
- }
-
- n = read(f,read_buffer+read_buffer_len,n);
- if (n > 0) {
- read_buffer_len += n;
- }
- }
-
-
- static int readfd(int fd,char *buffer,int N)
- {
- int ret;
- int total=0;
-
- while (total < N)
- {
- if (read_buffer_len > 0) {
- ret = MIN(read_buffer_len,N-total);
- memcpy(buffer+total,read_buffer_p,ret);
- read_buffer_p += ret;
- read_buffer_len -= ret;
- } else {
- while ((ret = read(fd,buffer + total,N - total)) == -1) {
- fd_set fds;
-
- if (errno != EAGAIN && errno != EWOULDBLOCK)
- return -1;
- FD_ZERO(&fds);
- FD_SET(fd, &fds);
- select(fd+1, &fds, NULL, NULL, NULL);
- }
- }
-
- if (ret <= 0)
- return total;
- total += ret;
- }
- return total;
- }
-
-
- int read_int(int f)
- {
- int ret;
- char b[4];
- if ((ret=readfd(f,b,4)) != 4) {
- if (verbose > 1)
- fprintf(FERROR,"(%d) Error reading %d bytes : %s\n",
- getpid(),4,ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
- }
- total_read += 4;
- return IVAL(b,0);
- }
-
- void read_buf(int f,char *buf,int len)
- {
- int ret;
- if ((ret=readfd(f,buf,len)) != len) {
- if (verbose > 1)
- fprintf(FERROR,"(%d) Error reading %d bytes : %s\n",
- getpid(),len,ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
- }
- total_read += len;
- }
-
- unsigned char read_byte(int f)
- {
- unsigned char c;
- read_buf(f,(char *)&c,1);
- return c;
- }
-
-
- static char last_byte=0;
- static int last_sparse = 0;
-
- int sparse_end(int f)
- {
- if (last_sparse) {
- lseek(f,-1,SEEK_CUR);
- return (write(f,&last_byte,1) == 1 ? 0 : -1);
- }
- last_sparse = 0;
- return 0;
- }
-
- int write_sparse(int f,char *buf,int len)
- {
- int l1=0,l2=0;
- int ret;
-
- if (!sparse_files)
- return write(f,buf,len);
-
- for (l1=0;l1<len && buf[l1]==0;l1++) ;
- for (l2=0;l2<(len-l1) && buf[len-(l2+1)]==0;l2++) ;
-
- last_byte = buf[len-1];
-
- if (l1 == len || l2 > 0)
- last_sparse=1;
-
- if (l1 > 0)
- lseek(f,l1,SEEK_CUR);
-
- if (l1 == len)
- return len;
-
- if ((ret=write(f,buf+l1,len-(l1+l2))) != len-(l1+l2)) {
- if (ret == -1 || ret == 0) return ret;
- return (l1+ret);
- }
-
- if (l2 > 0)
- lseek(f,l2,SEEK_CUR);
-
- return len;
- }
-
- int read_write(int fd_in,int fd_out,int size)
- {
- static char *buf=NULL;
- int bufsize = sparse_files?SPARSE_WRITE_SIZE:WRITE_SIZE;
- int total=0;
-
- if (!buf) {
- buf = (char *)malloc(bufsize);
- if (!buf) out_of_memory("read_write");
- }
-
- while (total < size) {
- int n = MIN(size-total,bufsize);
- read_buf(fd_in,buf,n);
- if (write_sparse(fd_out,buf,n) != n)
- return total;
- total += n;
- }
- return total;
- }
-
-
- static int writefd(int fd,char *buf,int len)
- {
- int total = 0;
- fd_set fds;
- struct timeval tv;
-
- if (buffer_f_in == -1)
- return write(fd,buf,len);
-
- while (total < len) {
- int ret = write(fd,buf+total,len-total);
-
- if (ret == 0) return total;
-
- if (ret == -1 && !(errno == EWOULDBLOCK || errno == EAGAIN))
- return -1;
-
- if (ret == -1) {
- read_check(buffer_f_in);
-
- FD_ZERO(&fds);
- FD_SET(fd,&fds);
- tv.tv_sec = BLOCKING_TIMEOUT;
- tv.tv_usec = 0;
- select(fd+1,NULL,&fds,NULL,&tv);
- } else {
- total += ret;
- }
- }
-
- return total;
- }
-
-
-
- void write_int(int f,int x)
- {
- int ret;
- char b[4];
- SIVAL(b,0,x);
- if ((ret=writefd(f,b,4)) != 4) {
- fprintf(FERROR,"write_int failed : %s\n",
- ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
- }
- total_written += 4;
- }
-
- void write_buf(int f,char *buf,int len)
- {
- int ret;
- if ((ret=writefd(f,buf,len)) != len) {
- fprintf(FERROR,"write_buf failed : %s\n",
- ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
- }
- total_written += len;
- }
-
-
- void write_byte(int f,unsigned char c)
- {
- write_buf(f,(char *)&c,1);
- }
-
- void write_flush(int f)
- {
- }
-
-
-