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

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. * 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 <stdio.h>
#include <string.h> #include <string.h>
#define MAX_FILENAME_LEN 40
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
PROCESS(shell_ls_process, "ls"); PROCESS(shell_ls_process, "ls");
SHELL_COMMAND(ls_command, SHELL_COMMAND(ls_command,
@ -64,7 +66,7 @@ SHELL_COMMAND(write_command,
PROCESS(shell_read_process, "read"); PROCESS(shell_read_process, "read");
SHELL_COMMAND(read_command, SHELL_COMMAND(read_command,
"read", "read",
"read <filename>: read from file", "read <filename> [offset]: read from file, with an optional offset",
&shell_read_process); &shell_read_process);
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
PROCESS_THREAD(shell_ls_process, ev, data) PROCESS_THREAD(shell_ls_process, ev, data)
@ -82,6 +84,7 @@ PROCESS_THREAD(shell_ls_process, ev, data)
while(cfs_readdir(&dir, &dirent) == 0) { while(cfs_readdir(&dir, &dirent) == 0) {
totsize += dirent.size; totsize += dirent.size;
sprintf(buf, "%3d ", dirent.size); sprintf(buf, "%3d ", dirent.size);
/* printf("'%s'\n", dirent.name);*/
shell_output_str(&ls_command, buf, dirent.name); shell_output_str(&ls_command, buf, dirent.name);
} }
cfs_closedir(&dir); cfs_closedir(&dir);
@ -166,40 +169,68 @@ PROCESS_THREAD(shell_write_process, ev, data)
PROCESS_THREAD(shell_read_process, ev, data) PROCESS_THREAD(shell_read_process, ev, data)
{ {
static int fd = 0; static int fd = 0;
char *next;
char filename[MAX_FILENAME_LEN];
int len;
int offset = 0;
PROCESS_EXITHANDLER(cfs_close(fd)); PROCESS_EXITHANDLER(cfs_close(fd));
PROCESS_BEGIN(); PROCESS_BEGIN();
fd = cfs_open(data, CFS_READ); if(data != NULL) {
next = strchr(data, ' ');
if(fd < 0) { if(next == NULL) {
shell_output_str(&read_command, strncpy(filename, data, sizeof(filename));
"read: could not open file for reading: ", data); } else {
} else { len = next - (char *)data;
while(1) {
char buf[40];
int len;
struct shell_input *input;
len = cfs_read(fd, buf, sizeof(buf));
if(len <= 0) { if(len <= 0) {
cfs_close(fd); shell_output_str(&read_command,
"read: filename too short: ", data);
PROCESS_EXIT(); PROCESS_EXIT();
} }
shell_output(&read_command, if(len > MAX_FILENAME_LEN) {
buf, len, "", 0); 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); while(1) {
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_CONTINUE || char buf[40];
ev == shell_event_input); int len;
struct shell_input *input;
if(ev == shell_event_input) {
input = data; len = cfs_read(fd, buf, sizeof(buf));
/* printf("cat input %d %d\n", input->len1, input->len2);*/ if(len <= 0) {
if(input->len1 + input->len2 == 0) {
cfs_close(fd); cfs_close(fd);
PROCESS_EXIT(); 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();
}
}
} }
} }
} }