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Added an optional 'offset' parameter to the read command. With the offset parameter, reading starts 'offset' bytes into the file

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This commit is contained in:
adamdunkels 2008-07-03 21:13:54 +00:00
parent 56fd2519f7
commit fa9a34993f
1 changed files with 57 additions and 26 deletions
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83
apps/shell/shell-file.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: shell-file.c,v 1.4 2008/07/02 14:06:46 adamdunkels Exp $
* $Id: shell-file.c,v 1.5 2008/07/03 21:13:54 adamdunkels Exp $
*/
/**
@ -45,6 +45,8 @@
#include <stdio.h>
#include <string.h>
#define MAX_FILENAME_LEN 40
/*---------------------------------------------------------------------------*/
PROCESS(shell_ls_process, "ls");
SHELL_COMMAND(ls_command,
@ -64,7 +66,7 @@ SHELL_COMMAND(write_command,
PROCESS(shell_read_process, "read");
SHELL_COMMAND(read_command,
"read",
"read <filename>: read from file",
"read <filename> [offset]: read from file, with an optional offset",
&shell_read_process);
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(shell_ls_process, ev, data)
@ -82,6 +84,7 @@ PROCESS_THREAD(shell_ls_process, ev, data)
while(cfs_readdir(&dir, &dirent) == 0) {
totsize += dirent.size;
sprintf(buf, "%3d ", dirent.size);
/* printf("'%s'\n", dirent.name);*/
shell_output_str(&ls_command, buf, dirent.name);
}
cfs_closedir(&dir);
@ -166,40 +169,68 @@ PROCESS_THREAD(shell_write_process, ev, data)
PROCESS_THREAD(shell_read_process, ev, data)
{
static int fd = 0;
char *next;
char filename[MAX_FILENAME_LEN];
int len;
int offset = 0;
PROCESS_EXITHANDLER(cfs_close(fd));
PROCESS_BEGIN();
fd = cfs_open(data, CFS_READ);
if(fd < 0) {
shell_output_str(&read_command,
"read: could not open file for reading: ", data);
} else {
while(1) {
char buf[40];
int len;
struct shell_input *input;
len = cfs_read(fd, buf, sizeof(buf));
if(data != NULL) {
next = strchr(data, ' ');
if(next == NULL) {
strncpy(filename, data, sizeof(filename));
} else {
len = next - (char *)data;
if(len <= 0) {
cfs_close(fd);
shell_output_str(&read_command,
"read: filename too short: ", data);
PROCESS_EXIT();
}
shell_output(&read_command,
buf, len, "", 0);
if(len > MAX_FILENAME_LEN) {
shell_output_str(&read_command,
"read: filename too long: ", data);
PROCESS_EXIT();
}
memcpy(filename, data, len);
filename[len] = 0;
offset = shell_strtolong(next, NULL);
}
fd = cfs_open(filename, CFS_READ);
cfs_seek(fd, offset);
if(fd < 0) {
shell_output_str(&read_command,
"read: could not open file for reading: ", filename);
} else {
process_post(&shell_read_process, PROCESS_EVENT_CONTINUE, NULL);
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_CONTINUE ||
ev == shell_event_input);
if(ev == shell_event_input) {
input = data;
/* printf("cat input %d %d\n", input->len1, input->len2);*/
if(input->len1 + input->len2 == 0) {
while(1) {
char buf[40];
int len;
struct shell_input *input;
len = cfs_read(fd, buf, sizeof(buf));
if(len <= 0) {
cfs_close(fd);
PROCESS_EXIT();
}
shell_output(&read_command,
buf, len, "", 0);
process_post(&shell_read_process, PROCESS_EVENT_CONTINUE, NULL);
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_CONTINUE ||
ev == shell_event_input);
if(ev == shell_event_input) {
input = data;
/* printf("cat input %d %d\n", input->len1, input->len2);*/
if(input->len1 + input->len2 == 0) {
cfs_close(fd);
PROCESS_EXIT();
}
}
}
}
}