]> cloudbase.mooo.com Git - z180-stamp.git/blobdiff - avr/cmd_fat.c
Call subcommands from main command processor
[z180-stamp.git] / avr / cmd_fat.c
index af2f77253092198d04dfe74b0b0267a9937158bf..db89ffab9d85bf5dacbad85e1fc1150d18d95018 100644 (file)
@@ -1,32 +1,40 @@
 /*
- * (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
+ * (C) Copyright 2014,2016 Leo C. <erbl259-lmu@yahoo.de>
  *
- * SPDX-License-Identifier:    GPL-2.0+
+ * SPDX-License-Identifier:    GPL-2.0
  */
 
 /*
  * FAT filesystem commands
  */
 
+#include "cmd_fat.h"
 #include "common.h"
-#include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
 
 #include "command.h"
 #include "ff.h"
 #include "z80-if.h"
+#include "eval_arg.h"
 #include "con-utils.h"
 #include "print-utils.h"
 #include "time.h"
 #include "timer.h"
 #include "debug.h"
+#include "env.h"
+#include "getopt-min.h"
 
 /* TODO: use memory size test function (cmd_mem.c) */
 #define MAX_MEMORY     (1ul << 19)
 #define BUFFER_SIZE    512
 
 
+FATFS FatFs0;
+FATFS FatFs1;
+
+char chur_drv[3];
+
 DWORD get_fattime (void)
 {
        time_t timer;
@@ -69,21 +77,28 @@ static const FLASH char * const FLASH rc_names[] = {
                        FSTR("TIMEOUT"),
                        FSTR("LOCKED"),
                        FSTR("NOT_ENOUGH_CORE"),
-                       FSTR("TOO_MANY_OPEN_FILES")
+                       FSTR("TOO_MANY_OPEN_FILES"),
+                       FSTR("INVALID_PARAMETER")
                };
 
 static
 void put_rc (FRESULT rc)
 {
-       if (rc < ARRAY_SIZE(rc_names)) {
 #if GCC_BUG_61443
-               printf_P(PSTR("rc=%u FR_"), rc);
-               my_puts_P(rc_names[rc]);
-               my_puts_P(PSTR("\n"));
+       printf_P(PSTR("rc=%u FR_"), rc);
+       my_puts_P(rc < ARRAY_SIZE(rc_names) ? rc_names[rc] : PSTR(" Unknown Error"));
+       my_puts_P(PSTR("\n"));
 #else
-               printf_P(PSTR("rc=%u FR_%S\n"), rc, rc_names[rc]);
+       printf_P(PSTR("rc=%u FR_%S\n"), rc,
+       rc < ARRAY_SIZE(rc_names) ? rc_names[rc] : PSTR(" Unknown Error"));
 #endif
-       }
+}
+
+
+void setup_fatfs(void)
+{
+       f_mount(&FatFs0, "0:", 0);
+       f_mount(&FatFs1, "1:", 0);
 }
 
 
@@ -155,24 +170,26 @@ FRESULT scan_files (
  * fatstat path - Show logical drive status
  *
  */
-command_ret_t do_fat_stat(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+command_ret_t do_stat(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
 {
        FATFS *fs;
        DWORD nfreeclst;
        FRESULT res;
-       char *path;
+       char *buf;
+       char *path = "";
        struct stat_dat_s statp;
 
        (void) cmdtp; (void) flag; (void) argc;
 
-       path = (char *) malloc(BUFFER_SIZE);
-       if (path == NULL) {
-               printf_P(PSTR("fatstat: Out of Memory!\n"));
-               free(path);
+       buf = (char *) malloc(BUFFER_SIZE);
+       if (buf == NULL) {
+               printf_P(PSTR("fat stat: Out of Memory!\n"));
                return CMD_RET_FAILURE;
        }
 
-       res = f_getfree(argv[1], &nfreeclst, &fs);
+       if (argc > 1)
+               path = argv[1];
+       res = f_getfree(path, &nfreeclst, &fs);
        if (!res) {
                printf_P(PSTR(
                                        "FAT type:                %u\n"
@@ -189,22 +206,21 @@ command_ret_t do_fat_stat(cmd_tbl_t *cmdtp, int flag, int argc, char * const arg
                                fs->fatbase, fs->dirbase, fs->database);
 
 #if _USE_LABEL
-               TCHAR label[12];
                DWORD serial;
-               res = f_getlabel(argv[1], label, &serial);
+               res = f_getlabel(path, buf, &serial);
                if (!res) {
                        printf_P(PSTR(
                                                "Volume name:             %s\n"
                                                "Volume S/N:              %04X-%04X\n"),
-                                       label, (WORD)(serial >> 16), (WORD)(serial & 0xFFFF));
+                                       buf, (WORD)(serial >> 16), (WORD)(serial & 0xFFFF));
                }
 #endif
                if (!res) {
                        my_puts_P(PSTR("\nCounting...  "));
                        statp.AccSize = statp.AccFiles = statp.AccDirs = 0;
-                       strcpy(path, argv[1]);
+                       strcpy(buf, path);
 
-                       res = scan_files(path, &statp);
+                       res = scan_files(buf, &statp);
                }
                if (!res) {
                        printf_P(PSTR("\r%u files, %lu bytes.\n%u folders.\n"
@@ -215,7 +231,77 @@ command_ret_t do_fat_stat(cmd_tbl_t *cmdtp, int flag, int argc, char * const arg
                }
        }
 
-       free(path);
+       free(buf);
+       if (res) {
+               put_rc(res);
+               return CMD_RET_FAILURE;
+       }
+       return CMD_RET_SUCCESS;
+}
+
+/*
+ * pwd - Print current directory of the current drive.
+ *
+ */
+command_ret_t do_pwd(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
+{
+       FRESULT res;
+       char *buf;
+
+       (void) cmdtp; (void) flag; (void) argc; (void) argv;
+
+       buf = (char *) malloc(BUFFER_SIZE);
+       if (buf == NULL) {
+               printf_P(PSTR("pwd: Out of Memory!\n"));
+               free(buf);
+               return CMD_RET_FAILURE;
+       }
+
+       res = f_getcwd(buf, BUFFER_SIZE);  /* Get current directory path */
+
+       if (!res) {
+               puts(buf);
+       }
+       free(buf);
+       if (res) {
+               put_rc(res);
+               return CMD_RET_FAILURE;
+       }
+       return CMD_RET_SUCCESS;
+}
+
+
+/*
+ * cd - Change the current/working directory.
+ *
+ */
+command_ret_t do_cd(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
+{
+       char *arg;
+       FRESULT res = 0;
+
+       (void) cmdtp; (void) flag; (void) argc;
+
+       if (argc < 2) {
+               arg = getenv_str(PSTR(ENV_HOME));
+               if (arg == NULL) {
+                       printf_P(PSTR("%s: \"%S\" is not set\n"), argv[0], PSTR(ENV_HOME));
+                       return CMD_RET_FAILURE;
+               }
+       } else
+               arg = argv[1];
+
+       if (arg[1] == ':') {
+               char drv[3];
+               drv[2] = '\0';
+               drv[1] = ':';
+               drv[0] = arg[0];
+               res = f_chdrive(drv);
+       }
+       if (!res) {
+               res = f_chdir(arg);
+       }
+
        if (res) {
                put_rc(res);
                return CMD_RET_FAILURE;
@@ -223,12 +309,45 @@ command_ret_t do_fat_stat(cmd_tbl_t *cmdtp, int flag, int argc, char * const arg
        return CMD_RET_SUCCESS;
 }
 
+#define MAX_PATHLEN 255
+
+       /* Remove trailing slashes,
+        * but keep a leading slash (absolute path)
+        */
+void strip_trailing_slash_relpath(char *p)
+{
+       int n = strlen(p);
+
+       if (n >= 2 && (p[0] & 0x38) == '0' &&  p[1] == ':') {
+               p += 2;
+               n -= 2;
+       }
+       if (n >= 1 &&  p[0] == '/') {
+               p++;
+               n--;
+       }
+       while (n-- != 0  && p[n] == '/')
+                       p[n] = '\0';
+}
+
+int print_dirent(FILINFO *f)
+{
+       return printf_P(PSTR("%c%c%c%c%c %u/%02u/%02u %02u:%02u %9lu  %s\n"),
+                               (f->fattrib & AM_DIR) ? 'D' : '-',
+                               (f->fattrib & AM_RDO) ? 'R' : '-',
+                               (f->fattrib & AM_HID) ? 'H' : '-',
+                               (f->fattrib & AM_SYS) ? 'S' : '-',
+                               (f->fattrib & AM_ARC) ? 'A' : '-',
+                               (f->fdate >> 9) + 1980, (f->fdate >> 5) & 15, f->fdate & 31,
+                               (f->ftime >> 11), (f->ftime >> 5) & 63,
+                               f->fsize, f->fname);
+}
 
 /*
  * fatls path - Directory listing
  *
  */
-command_ret_t do_fat_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+command_ret_t do_ls(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
 {
        FATFS *fs;
        DIR Dir;                                        /* Directory object */
@@ -236,50 +355,53 @@ command_ret_t do_fat_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[
        unsigned long p1;
        unsigned int s1, s2;
        FRESULT res;
-#if _USE_LFN
-       char Lfname[_MAX_LFN+1];
-       Finfo.lfname = Lfname;
-       Finfo.lfsize = sizeof Lfname;
-#endif
-
        (void) cmdtp; (void) flag; (void) argc;
 
-       res = f_opendir(&Dir, argv[1]);
-       if (res) {
-               put_rc(res);
-               return CMD_RET_FAILURE;
+
+       char *path = "";
+       if (argc > 1)
+               path = argv[1];
+       strip_trailing_slash_relpath(path);
+
+       char *p = strrchr(path, '/');
+       if (p)
+               p++;
+       else {
+               p = path;
+               char *q = p;
+               if ((*q++ & 0x38) == '0' &&  *q++ == ':')
+                       p = q;
        }
 
+       char *pattern = NULL;
+       if (strpbrk_P(p, PSTR("*?")) ||
+                       (f_stat(path, &Finfo) == FR_OK && !(Finfo.fattrib & AM_DIR))) {
+               pattern = strdup(p);
+               *p = '\0';
+       }
+       strip_trailing_slash_relpath(path);
+
+printf_P(PSTR("*: |%s| |%s|\n"), path ? path : "<NULL>", pattern ? pattern : "<NULL>");
+
        p1 = s1 = s2 = 0;
-       for(;;) {
-               res = f_readdir(&Dir, &Finfo);
-               if ((res != FR_OK) || !Finfo.fname[0])
-                       break;
+       res = f_findfirst(&Dir, &Finfo, path, pattern ? pattern : "*");  /* Start to search for files */
+       while (res == FR_OK && Finfo.fname[0]) {
                if (Finfo.fattrib & AM_DIR) {
                        s2++;
                } else {
                        s1++; p1 += Finfo.fsize;
                }
-               printf_P(PSTR("%c%c%c%c%c %u/%02u/%02u %02u:%02u %9lu  "),
-                                       (Finfo.fattrib & AM_DIR) ? 'D' : '-',
-                                       (Finfo.fattrib & AM_RDO) ? 'R' : '-',
-                                       (Finfo.fattrib & AM_HID) ? 'H' : '-',
-                                       (Finfo.fattrib & AM_SYS) ? 'S' : '-',
-                                       (Finfo.fattrib & AM_ARC) ? 'A' : '-',
-                                       (Finfo.fdate >> 9) + 1980, (Finfo.fdate >> 5) & 15, Finfo.fdate & 31,
-                                       (Finfo.ftime >> 11), (Finfo.ftime >> 5) & 63, Finfo.fsize);
-#if _USE_LFN
-               printf_P(PSTR("%s\n"), *Lfname ? Lfname : Finfo.fname);
-#else
-               printf_P(PSTR("%s\n"), Finfo.fname);
-#endif
+               print_dirent(&Finfo);
                if (check_abort())
                        break;
+               res = f_findnext(&Dir, &Finfo);
        }
+       f_closedir(&Dir);
+       free(pattern);
 
        if (res == FR_OK) {
                printf_P(PSTR("%4u File(s),%10lu bytes total\n%4u Dir(s)"), s1, p1, s2);
-               if (f_getfree(argv[1], (DWORD*)&p1, &fs) == FR_OK)
+               if (f_getfree(path, (DWORD*)&p1, &fs) == FR_OK)
                        printf_P(PSTR(", %10luK bytes free\n"), p1 * fs->csize / 2);
        }
 
@@ -291,6 +413,63 @@ command_ret_t do_fat_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[
        return CMD_RET_SUCCESS;
 }
 
+command_ret_t do_tst(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
+{
+       DIR Dir;                                        /* Directory object */
+       FILINFO Finfo;
+       FRESULT res = FR_OK;
+       char *path;
+
+       (void) cmdtp; (void) flag;
+
+       printf_P(PSTR("sizeof DIR: %u, sizeof FIL: %u\n"), sizeof (DIR), sizeof (FILINFO));
+
+       char * buf = (char *) malloc(BUFFER_SIZE);
+       if (buf == NULL) {
+               printf_P(PSTR("pwd: Out of Memory!\n"));
+               free(buf);
+               return CMD_RET_FAILURE;
+       }
+       res = f_getcwd(buf, BUFFER_SIZE);  /* Get current directory path */
+
+       if (!res) {
+               printf_P(PSTR("cwd: |%s|\n"), buf);
+       }
+       free(buf);
+       if (res) {
+               put_rc(res);
+               return CMD_RET_FAILURE;
+       }
+
+       if (argc > 1)
+               path = argv[1];
+       else
+               path = "";
+
+       printf_P(PSTR("arg: |%s|\n"), path);
+       printf_P(PSTR("==== f_stat:      "));
+       res = f_stat(path, &Finfo);
+       put_rc(res);
+       if (res == FR_OK) {
+               print_dirent(&Finfo);
+       }
+
+       printf_P(PSTR("==== f_findfirst: "));
+       res = f_findfirst(&Dir, &Finfo, path, "*");  /* Start to search for files */
+       put_rc(res);
+       if (res == FR_OK) {
+               print_dirent(&Finfo);
+       }
+       f_closedir(&Dir);
+
+       printf_P(PSTR("==== f_opendir:   "));
+       res = f_opendir(&Dir, path);
+       put_rc(res);
+       f_closedir(&Dir);
+
+       return CMD_RET_SUCCESS;
+}
+
 static
 FRESULT mkpath(TCHAR *path)
 {
@@ -301,11 +480,6 @@ FRESULT mkpath(TCHAR *path)
        TCHAR *p, *q;
        FRESULT ret;
 
-#if _USE_LFN
-    fd.lfname = 0;
-#endif
-
-
        res = f_stat (path, &fd)
 
        p = strchr(path, ':');
@@ -330,7 +504,7 @@ FRESULT mkpath(TCHAR *path)
  *             read  <d:/path/filename> <addr> [bytes [pos]]
  *             write <d:/path/filename> <addr> <bytes>
  */
-command_ret_t do_fat_rw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+command_ret_t do_rw(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
 {
        FIL File;
        uint32_t addr;
@@ -338,8 +512,8 @@ command_ret_t do_fat_rw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[
        unsigned long pos;
        unsigned long bytes_rw;
 
-       bool dowrite = (argv[0][3] == 'w');
-       FRESULT res;
+       bool dowrite = (argv[0][0] == 'w');
+       FRESULT res = FR_OK;
        bool buserr = 0;
        uint32_t timer;
        uint8_t *buffer;
@@ -349,17 +523,17 @@ command_ret_t do_fat_rw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[
        if (argc < (dowrite ? 4 : 3))
                return CMD_RET_USAGE;
 
-       addr = strtoul(argv[2], 0, 16);
+       addr = eval_arg(argv[2], NULL);
        if (addr >= MAX_MEMORY) {
                printf_P(PSTR("address too high: 0x%0lx\n"), addr);
                return CMD_RET_FAILURE;
        }
        if (argc > 3)
-               bytes = strtoul(argv[3], 0, 16);
+               bytes = eval_arg(argv[3], NULL);
        else
                bytes = MAX_MEMORY;
        if (argc > 4)
-               pos = strtoul(argv[4], 0, 16);
+               pos = eval_arg(argv[4], NULL);
        else
                pos = 0;
 
@@ -448,3 +622,232 @@ command_ret_t do_fat_rw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[
 
        return CMD_RET_SUCCESS;
 }
+
+/* ========================================================================== */
+
+
+typedef struct {
+       char *p_end;                    /* pointer to NULL at end of path */
+       char p_path[MAX_PATHLEN + 1];   /* pointer to the start of a path */
+} PATH_T;
+
+static inline void strip_trailing_slash(PATH_T *p)
+{
+       while (p->p_end > p->p_path && p->p_end[-1] == '/')
+               *--p->p_end = 0;
+}
+
+/*
+ * Move specified string into path.  Convert "" to "." to handle BSD
+ * semantics for a null path.  Strip trailing slashes.
+ */
+int
+path_set(PATH_T *p, char *string)
+{
+       if (strlen(string) > MAX_PATHLEN) {
+               //err("%s: name too long", string);
+               return(0);
+       }
+
+       (void)strcpy(p->p_path, string);
+       p->p_end = p->p_path + strlen(p->p_path);
+
+       if (p->p_path == p->p_end) {
+               *p->p_end++ = '.';
+               *p->p_end = 0;
+       }
+
+       strip_trailing_slash(p);
+       return(1);
+}
+
+#define R_FLAG (1<<0)
+#define I_FLAG (1<<1)
+#define N_FLAG (1<<2)
+#define F_FLAG (1<<3)
+#define P_FLAG (1<<4)
+#define V_FLAG (1<<5)
+
+command_ret_t do_cp(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc, char * const argv[])
+{
+
+    FRESULT fr;     /* Return value */
+    DIR dj;         /* Directory search object */
+    FILINFO fno;    /* File information */
+
+       uint8_t flags = 0;
+
+
+       /* reset getopt() */
+       optind = 0;
+
+       int opt;
+       while ((opt = getopt(argc, argv, PSTR("Rrfip"))) != -1) {
+       switch (opt) {
+               case 'f':
+                       flags &= I_FLAG;
+                       break;
+               case 'i':
+                       flags |= I_FLAG;
+                       flags &= F_FLAG;
+                       break;
+               case 'p':
+                       flags |= P_FLAG;
+                       break;
+               case 'R':
+               case 'r':
+                       flags |= R_FLAG;
+                       break;
+               case 'v':
+                       flags |= V_FLAG;
+                       break;
+               default:
+                       return CMD_RET_USAGE;
+                       break;
+               }
+       }
+       argc -= optind;
+       argv += optind;
+
+       if (argc < 2)
+               return CMD_RET_USAGE;
+
+#if 0
+       /* consume last argument first. */
+       if (!path_set(&to, argv[--argc]))
+               exit(1);
+
+
+               if (flags & V_FLAG)
+                       printf_P((PSTR("%s  %s -> %s\n", badcp ? : "ERR:" : "    ",
+                                       curr->fts_path, to.p_path);
+#endif
+
+/* Search a directory for objects and display it */
+
+
+    fr = f_findfirst(&dj, &fno, argv[1], argv[2]);  /* Start to search for files */
+
+    while (fr == FR_OK && fno.fname[0]) {         /* Repeat while an item is found */
+               printf_P(PSTR("%c%c%c%c%c %u/%02u/%02u %02u:%02u %9lu  %s\n"),
+                                       (fno.fattrib & AM_DIR) ? 'D' : '-',
+                                       (fno.fattrib & AM_RDO) ? 'R' : '-',
+                                       (fno.fattrib & AM_HID) ? 'H' : '-',
+                                       (fno.fattrib & AM_SYS) ? 'S' : '-',
+                                       (fno.fattrib & AM_ARC) ? 'A' : '-',
+                                       (fno.fdate >> 9) + 1980, (fno.fdate >> 5) & 15, fno.fdate & 31,
+                                       (fno.ftime >> 11), (fno.ftime >> 5) & 63,
+                                       fno.fsize, fno.fname);
+        fr = f_findnext(&dj, &fno);               /* Search for next item */
+    }
+
+    f_closedir(&dj);
+
+       return CMD_RET_SUCCESS;
+}
+
+
+static
+command_ret_t do_help(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[]);
+
+cmd_tbl_t cmd_tbl_fat[] = {
+CMD_TBL_ITEM(
+       stat,   2,      CTBL_REPEAT,    do_stat,
+       "Show logical drive status",
+       "dev"
+),
+CMD_TBL_ITEM(
+       pwd,    2,      CTBL_REPEAT,    do_pwd,
+       "Print name of current/working directory",
+       ""
+),
+CMD_TBL_ITEM(
+       cd,     2,      CTBL_REPEAT,    do_cd,
+       "Change the current/working directory.",
+       "path"
+),
+CMD_TBL_ITEM(
+       ls,     2,      CTBL_REPEAT,    do_ls,
+       "Directory listing",
+       "path"
+),
+CMD_TBL_ITEM(
+       tst,    2,      CTBL_REPEAT,    do_tst,
+       "FatFS test function",
+       "path"
+),
+CMD_TBL_ITEM(
+       load,   5,      0,      do_rw,
+       "load binary file from a dos filesystem",
+       "<d:/path/filename> <addr> [bytes [pos]]\n"
+       "    - Load binary file 'path/filename' on logical drive 'd'\n"
+       "      to address 'addr' from dos filesystem.\n"
+       "      'pos' gives the file position to start loading from.\n"
+       "      If 'pos' is omitted, 0 is used. 'pos' requires 'bytes'.\n"
+       "      'bytes' gives the size to load. If 'bytes' is 0 or omitted,\n"
+       "      the load stops on end of file."
+),
+CMD_TBL_ITEM(
+       write,  4,      0,      do_rw,
+       "write file into a dos filesystem",
+       "<d:/path/filename> <addr> <bytes>\n"
+       "    - Write file to 'path/filename' on logical drive 'd' from RAM\n"
+       "      starting at address 'addr'.\n"
+),
+
+CMD_TBL_ITEM(
+       cp,     CONFIG_SYS_MAXARGS,     0,      do_cp,
+       "copy files",
+       "cp     [-R] [-f | -i | -n] [-aprv] source_file target_file\n"
+       "    - \n"
+),
+
+CMD_TBL_ITEM(
+       help,   CONFIG_SYS_MAXARGS,     CTBL_REPEAT,    do_help,
+       "Print sub command description/usage",
+       "\n"
+       "       - print brief description of all sub commands\n"
+       "fat help command ...\n"
+       "       - print detailed usage of sub cmd 'command'"
+),
+
+/* This does not use the CMD_TBL_ITEM macro as ? can't be used in symbol names */
+       {FSTR("?"),   CONFIG_SYS_MAXARGS, 1, do_help,
+        FSTR("Alias for 'help'"),
+#ifdef  CONFIG_SYS_LONGHELP
+       FSTR(""),
+#endif /* CONFIG_SYS_LONGHELP */
+       NULL,
+#ifdef CONFIG_AUTO_COMPLETE
+       NULL,
+#endif
+},
+/* Mark end of table */
+{ 0 },
+};
+
+static
+command_ret_t do_help(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
+{
+       return _do_help(cmd_tbl_fat, cmdtp, flag, argc, argv);
+}
+
+
+command_ret_t do_fat(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
+{
+       cmd_tbl_t *cp;
+
+       if (argc < 2)
+               return CMD_RET_USAGE;
+
+       /* drop initial "fat" arg */
+       argc--;
+       argv++;
+
+       cp = find_cmd(argv[0], cmd_tbl_fat);
+
+       if (cp)
+               return cp->cmd(cmdtp, flag, argc, argv);
+
+       return CMD_RET_USAGE;
+}