From 7fd22c95466366915e62f3417caa9068c304bc41 Mon Sep 17 00:00:00 2001 From: Meco Man <920369182@qq.com> Date: Wed, 9 Jun 2021 16:43:14 +0800 Subject: [PATCH] [msh]implement tail command --- components/finsh/msh_file.c | 152 ++++++++++++++++++++++++++++++------ 1 file changed, 126 insertions(+), 26 deletions(-) diff --git a/components/finsh/msh_file.c b/components/finsh/msh_file.c index 459d77af4e..3f21cc6f34 100644 --- a/components/finsh/msh_file.c +++ b/components/finsh/msh_file.c @@ -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 @@ -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 ); +MSH_CMD_EXPORT_ALIAS(cmd_mount, mount, mount ); /* 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] \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] \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) */