/*
Copyright (C) Andrew Tridgell 1998
+ Copyright (C) 2002 by Martin Pool
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
static int write_sparse(int f,char *buf,size_t len)
{
- int l1=0,l2=0;
+ size_t l1=0, l2=0;
int ret;
for (l1=0;l1<len && buf[l1]==0;l1++) ;
if (l1 == len)
return len;
- if ((ret=write(f,buf+l1,len-(l1+l2))) != len-(l1+l2)) {
- if (ret == -1 || ret == 0) return ret;
+ ret = write(f, buf + l1, len - (l1+l2));
+ if (ret == -1 || ret == 0)
+ return ret;
+ else if (ret != (int) (len - (l1+l2)))
return (l1+ret);
- }
if (l2 > 0)
do_lseek(f,l2,SEEK_CUR);
return len;
}
-
-
+/*
+ * write_file does not allow incomplete writes. It loops internally
+ * until len bytes are written or errno is set.
+ */
int write_file(int f,char *buf,size_t len)
{
int ret = 0;
- if (!sparse_files) {
- return write(f,buf,len);
- }
-
while (len>0) {
- int len1 = MIN(len, SPARSE_WRITE_SIZE);
- int r1 = write_sparse(f, buf, len1);
+ int r1;
+ if (sparse_files) {
+ int len1 = MIN(len, SPARSE_WRITE_SIZE);
+ r1 = write_sparse(f, buf, len1);
+ } else {
+ r1 = write(f, buf, len);
+ }
if (r1 <= 0) {
if (ret > 0) return ret;
return r1;
struct map_struct *map_file(int fd,OFF_T len)
{
struct map_struct *map;
- map = (struct map_struct *)malloc(sizeof(*map));
+ map = new(struct map_struct);
if (!map) out_of_memory("map_file");
map->fd = fd;
map->p_offset = 0;
map->p_fd_offset = 0;
map->p_len = 0;
+ map->status = 0;
return map;
}
/* make sure we have allocated enough memory for the window */
if (window_size > map->p_size) {
- map->p = (char *)Realloc(map->p, window_size);
+ map->p = realloc_array(map->p, char, window_size);
if (!map->p) out_of_memory("map_ptr");
map->p_size = window_size;
}
}
if ((nread=read(map->fd,map->p + read_offset,read_size)) != read_size) {
- if (nread < 0) nread = 0;
+ if (nread < 0) {
+ nread = 0;
+ if (!map->status)
+ map->status = errno;
+ }
/* the best we can do is zero the buffer - the file
has changed mid transfer! */
memset(map->p+read_offset+nread, 0, read_size - nread);
}
-void unmap_file(struct map_struct *map)
+int unmap_file(struct map_struct *map)
{
+ int ret;
+
if (map->p) {
free(map->p);
map->p = NULL;
}
+ ret = map->status;
memset(map, 0, sizeof(*map));
free(map);
+
+ return ret;
}