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Merge pull request #4778 from mysterywolf/tail 

[msh] implement tail command
This commit is contained in:
Bernard Xiong 2021-06-10 15:27:51 +08:00 committed by GitHub
parent c8f72a215c 1106455fc3
commit cf4657a6a3
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 126 additions and 26 deletions
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152
components/finsh/msh_file.c
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@ -6,6 +6,7 @@
* Change Logs:
* Date Author Notes
* 2015-09-25 Bernard the first verion for FinSH
* 2021-06-09 Meco Man implement tail command
*/
#include <rtthread.h>
@ -146,7 +147,7 @@ int msh_exec_script(const char *cmd_line, int size)
extern char working_directory[];
#endif
int cmd_ls(int argc, char **argv)
static int cmd_ls(int argc, char **argv)
{
extern void ls(const char *pathname);
@ -165,9 +166,9 @@ int cmd_ls(int argc, char **argv)
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_ls, __cmd_ls, List information about the FILEs.);
MSH_CMD_EXPORT_ALIAS(cmd_ls, ls, List information about the FILEs.);
int cmd_cp(int argc, char **argv)
static int cmd_cp(int argc, char **argv)
{
void copy(const char *src, const char *dst);
@ -183,9 +184,9 @@ int cmd_cp(int argc, char **argv)
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_cp, __cmd_cp, Copy SOURCE to DEST.);
MSH_CMD_EXPORT_ALIAS(cmd_cp, cp, Copy SOURCE to DEST.);
int cmd_mv(int argc, char **argv)
static int cmd_mv(int argc, char **argv)
{
if (argc != 3)
{
@ -242,9 +243,9 @@ int cmd_mv(int argc, char **argv)
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_mv, __cmd_mv, Rename SOURCE to DEST.);
MSH_CMD_EXPORT_ALIAS(cmd_mv, mv, Rename SOURCE to DEST.);
int cmd_cat(int argc, char **argv)
static int cmd_cat(int argc, char **argv)
{
int index;
extern void cat(const char *filename);
@ -263,7 +264,7 @@ int cmd_cat(int argc, char **argv)
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_cat, __cmd_cat, Concatenate FILE(s));
MSH_CMD_EXPORT_ALIAS(cmd_cat, cat, Concatenate FILE(s));
static void directory_delete_for_msh(const char *pathname, char f, char v)
{
@ -329,7 +330,7 @@ static void directory_delete_for_msh(const char *pathname, char f, char v)
}
}
int cmd_rm(int argc, char **argv)
static int cmd_rm(int argc, char **argv)
{
int index, n;
char f = 0, r = 0, v = 0;
@ -399,10 +400,10 @@ int cmd_rm(int argc, char **argv)
}
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_rm, __cmd_rm, Remove(unlink) the FILE(s).);
MSH_CMD_EXPORT_ALIAS(cmd_rm, rm, Remove(unlink) the FILE(s).);
#ifdef DFS_USING_WORKDIR
int cmd_cd(int argc, char **argv)
static int cmd_cd(int argc, char **argv)
{
if (argc == 1)
{
@ -418,17 +419,17 @@ int cmd_cd(int argc, char **argv)
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_cd, __cmd_cd, Change the shell working directory.);
MSH_CMD_EXPORT_ALIAS(cmd_cd, cd, Change the shell working directory.);
int cmd_pwd(int argc, char **argv)
static int cmd_pwd(int argc, char **argv)
{
rt_kprintf("%s\n", working_directory);
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_pwd, __cmd_pwd, Print the name of the current working directory.);
MSH_CMD_EXPORT_ALIAS(cmd_pwd, pwd, Print the name of the current working directory.);
#endif
int cmd_mkdir(int argc, char **argv)
static int cmd_mkdir(int argc, char **argv)
{
if (argc == 1)
{
@ -442,9 +443,9 @@ int cmd_mkdir(int argc, char **argv)
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_mkdir, __cmd_mkdir, Create the DIRECTORY.);
MSH_CMD_EXPORT_ALIAS(cmd_mkdir, mkdir, Create the DIRECTORY.);
int cmd_mkfs(int argc, char **argv)
static int cmd_mkfs(int argc, char **argv)
{
int result = 0;
char *type = "elm"; /* use the default file system type as 'fatfs' */
@ -474,10 +475,10 @@ int cmd_mkfs(int argc, char **argv)
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_mkfs, __cmd_mkfs, format disk with file system);
MSH_CMD_EXPORT_ALIAS(cmd_mkfs, mkfs, format disk with file system);
extern struct dfs_filesystem filesystem_table[];
int cmd_mount(int argc, char *argv[])
static int cmd_mount(int argc, char **argv)
{
if (argc == 1)
{
@ -522,10 +523,10 @@ int cmd_mount(int argc, char *argv[])
return -1;
}
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_mount, __cmd_mount, mount <device> <mountpoint> <fstype>);
MSH_CMD_EXPORT_ALIAS(cmd_mount, mount, mount <device> <mountpoint> <fstype>);
/* unmount the filesystem from the specified mountpoint */
int cmd_umount(int argc, char *argv[])
static int cmd_umount(int argc, char **argv)
{
char *path = argv[1];
@ -547,10 +548,10 @@ int cmd_umount(int argc, char *argv[])
return 0;
}
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_umount, __cmd_umount, Unmount device from file system);
MSH_CMD_EXPORT_ALIAS(cmd_umount, umount, Unmount device from file system);
extern int df(const char *path);
int cmd_df(int argc, char **argv)
static int cmd_df(int argc, char **argv)
{
if (argc != 2)
{
@ -570,9 +571,9 @@ int cmd_df(int argc, char **argv)
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_df, __cmd_df, disk free);
MSH_CMD_EXPORT_ALIAS(cmd_df, df, disk free);
int cmd_echo(int argc, char **argv)
static int cmd_echo(int argc, char **argv)
{
if (argc == 2)
{
@ -600,7 +601,106 @@ int cmd_echo(int argc, char **argv)
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_echo, __cmd_echo, echo string to file);
MSH_CMD_EXPORT_ALIAS(cmd_echo, echo, echo string to file);
static int cmd_tail(int argc, char **argv)
{
int fd;
char c = RT_NULL;
char *file_name = RT_NULL;
rt_uint32_t total_lines = 0;
rt_uint32_t target_line = 0;
rt_uint32_t current_line = 0;
rt_uint32_t required_lines = 0;
rt_uint32_t after_xxx_line = 0;
if(argc < 2)
{
rt_kprintf("Usage: tail [-n numbers] <filename>\n");
return -1;
}
else if(argc == 2)
{
required_lines = 10; /* default: 10 lines from tail */
file_name = argv[1];
}
else if(rt_strcmp(argv[1], "-n") == 0)
{
if(argv[2][0] != '+')
{
required_lines = atoi(argv[2]);
}
else
{
after_xxx_line = atoi(&argv[2][1]); /* eg: +100, to get the 100 */
}
file_name = argv[3];
}
else
{
rt_kprintf("Usage: tail [-n numbers] <filename>\n");
return -1;
}
fd = open(file_name, O_RDONLY);
if (fd < 0)
{
rt_kprintf("File doesn't exist\n");
return -1;
}
while ((read(fd, &c, sizeof(char))) > 0)
{
if (c == '\n')
{
total_lines++;
}
}
rt_kprintf("\nTotal Number of lines:%d\n", total_lines);
if(after_xxx_line != 0)
{
if(total_lines > after_xxx_line)
{
required_lines = total_lines - after_xxx_line;
}
else
{
rt_kprintf("\nError:Required lines are more than total number of lines\n");
close(fd);
return -1;
}
}
if (required_lines > total_lines)
{
rt_kprintf("\nError:Required lines are more than total number of lines\n");
close(fd);
return -1;
}
rt_kprintf("Required Number of lines:%d\n", required_lines);
target_line = total_lines - required_lines;
lseek(fd, 0, SEEK_SET); /* back to head */
while ((read(fd, &c, sizeof(char))) > 0)
{
if (c == '\n')
{
current_line++;
}
if (current_line > target_line)
{
rt_kprintf("%c", c);
}
}
rt_kprintf("\n");
close(fd);
return 0;
}
MSH_CMD_EXPORT_ALIAS(cmd_tail, tail, print the last N-lines data of the given file);
#endif /* defined(FINSH_USING_MSH) && defined(RT_USING_DFS) */