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cc65/samples/tinyshell.c

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/*
** Simple ("tiny") shell to test filename and directory functions.
** Copyright (c) 2013,2016 Christian Groessler, chris@groessler.org
*/
#define VERSION_ASC "0.91"
#ifdef __ATARI__
#define UPPERCASE /* define (e.g. for Atari) to convert filenames etc. to upper case */
#define HAVE_SUBDIRS
#endif
#ifdef __APPLE2__
#define HAVE_SUBDIRS
#endif
#ifdef __CC65__
#define CHECK_SP
#endif
#define KEYB_BUFSZ 127
#define PROMPT ">>> "
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#ifndef __CC65__
#include <sys/stat.h>
#include <sys/param.h>
#define HAVE_SUBDIRS
#else
#define MAXPATHLEN 64
#endif
#include <sys/types.h>
#include <fcntl.h>
#include <dirent.h>
#ifdef CHECK_SP
extern unsigned int getsp(void); /* comes from getsp.s */
#endif
#define CMD_NOTHING 0
#define CMD_INVALID 1
#define CMD_HELP 2
#define CMD_QUIT 3
#define CMD_LS 4
#define CMD_MKDIR 5
#define CMD_RMDIR 6
#define CMD_CHDIR 7
#define CMD_RM 8
#define CMD_RENAME 9
#define CMD_COPY 10
#define CMD_PWD 11
#define CMD_CLS 12
#define CMD_VERBOSE 13
#define CMD_EXEC 14
static unsigned char verbose;
static unsigned char terminate;
static unsigned char cmd;
static char *cmd_asc, *arg1, *arg2, *arg3, *args; /* 'args': everything after command */
static char keyb_buf[KEYB_BUFSZ + 1];
static char keyb_buf2[KEYB_BUFSZ + 1];
static size_t cpbuf_sz = 4096;
struct cmd_table {
char *name;
unsigned char code;
} cmd_table[] = {
{ "help", CMD_HELP },
{ "quit", CMD_QUIT },
{ "q", CMD_QUIT },
{ "exit", CMD_QUIT },
{ "ls", CMD_LS },
{ "dir", CMD_LS },
{ "md", CMD_MKDIR },
#ifdef HAVE_SUBDIRS
{ "mkdir", CMD_MKDIR },
{ "rd", CMD_RMDIR },
{ "rmdir", CMD_RMDIR },
{ "cd", CMD_CHDIR },
{ "chdir", CMD_CHDIR },
#endif
{ "rm", CMD_RM },
{ "del", CMD_RM },
{ "cp", CMD_COPY },
{ "copy", CMD_COPY },
{ "mv", CMD_RENAME },
{ "ren", CMD_RENAME },
{ "pwd", CMD_PWD },
{ "exec", CMD_EXEC },
#ifdef __ATARI__
{ "cls", CMD_CLS },
#endif
{ "verbose", CMD_VERBOSE },
{ NULL, 0 }
};
static void banner(void)
{
puts("\"tiny\" command line shell, v" VERSION_ASC);
puts("written by chris@groessler.org");
puts("type 'help' for help\n");
}
static void get_command(void)
{
unsigned char i = 0;
#ifdef CHECK_SP
static char firstcall = 1;
static unsigned int good_sp;
unsigned int sp;
if (firstcall)
sp = good_sp = getsp();
else
sp = getsp();
if (sp != good_sp) {
printf("SP: 0x%04X ***MISMATCH*** 0x%04X\n", sp, good_sp);
}
else if (verbose)
printf("SP: 0x%04X\n", sp);
#endif
arg1 = arg2 = arg3 = NULL;
/* issue prompt */
printf(PROMPT);
/* get input from the user */
if (! fgets(keyb_buf, KEYB_BUFSZ, stdin)) {
puts("");
cmd = CMD_QUIT;
return;
}
/* put everything after first string into 'args' */
strcpy(keyb_buf2, keyb_buf); /* use a backup copy for 'args' */
/* skip over the first non-whitespace item */
cmd_asc = strtok(keyb_buf2, " \t\n");
if (cmd_asc)
args = strtok(NULL, ""); /* get everything */
else
*args = 0; /* no arguments */
/* split input into cmd, arg1, arg2, arg3 */
/* get and parse command */
cmd_asc = strtok(keyb_buf, " \t\n");
if (! cmd_asc) {
cmd = CMD_NOTHING;
return;
}
cmd = CMD_INVALID;
while (cmd_table[i].name) {
if (! strcmp(cmd_table[i].name, cmd_asc)) {
cmd = cmd_table[i].code;
break;
}
i++;
}
/* get arguments */
arg1 = strtok(NULL, " \t\n");
if (! arg1)
return;
arg2 = strtok(NULL, " \t\n");
if (! arg2)
return;
arg3 = strtok(NULL, " \t\n");
}
static void cmd_help(void)
{
puts("quit, exit - exit shell");
puts("ls, dir - display current directory");
puts(" and drive contents");
puts("rm, del - delete file");
puts("cp, copy - copy file");
puts("mv, ren - rename file");
puts("cd, chdir - change directory or drive");
puts("md, mkdir - make directory or drive");
puts("rd, rmdir - remove directory or drive");
puts("exec - run program");
#ifdef __ATARI__
puts("cls - clear screen");
#endif
puts("verbose - set verbosity level");
}
static void cmd_ls(void)
{
DIR *dir;
char *arg;
struct dirent *dirent;
#ifdef __ATARI__
char need_free = 0;
#endif
if (arg2) {
puts("usage: ls [dir]");
return;
}
/* print directory listing */
if (arg1) {
#ifdef UPPERCASE
strupr(arg1);
#endif
#ifdef __ATARI__
/* not sure if this shouldn't be done by the runtime lib */
if (*(arg1 + strlen(arg1) - 1) == ':' || *(arg1 + strlen(arg1) - 1) == '>') {
arg = malloc(strlen(arg1) + 4);
if (! arg) {
printf("malloc failed: %s", strerror(errno));
return;
}
need_free = 1;
memcpy(arg, arg1, strlen(arg1) + 1);
strcat(arg, "*.*");
}
else
#endif
arg = arg1;
}
else
arg = ".";
if (verbose)
printf("Buffer addr: %p\n", arg);
dir = opendir(arg);
#ifdef __ATARI__
if (need_free) free(arg);
#endif
if (! dir) {
puts("opendir failed");
return;
}
while (dirent = readdir(dir))
puts(dirent->d_name);
closedir(dir);
}
static void cmd_rm(void)
{
if (!arg1 || arg2) {
puts("usage: rm <file>");
return;
}
#ifdef UPPERCASE
strupr(arg1);
#endif
if (unlink(arg1))
printf("remove failed: %s\n", strerror(errno));
}
#ifdef HAVE_SUBDIRS
static void cmd_mkdir(void)
{
if (!arg1 || arg2) {
puts("usage: mkdir <dir>");
return;
}
#ifdef UPPERCASE
strupr(arg1);
#endif
if (mkdir(arg1, 0777))
printf("mkdir failed: %s\n", strerror(errno));
}
static void cmd_rmdir(void)
{
if (!arg1 || arg2) {
puts("usage: rmdir <dir>");
return;
}
#ifdef UPPERCASE
strupr(arg1);
#endif
if (rmdir(arg1))
printf("rmdir failed: %s\n", strerror(errno));
}
static void cmd_chdir(void)
{
if (!arg1 || arg2) {
puts("usage: cddir <dir>");
return;
}
#ifdef UPPERCASE
strupr(arg1);
#endif
if (chdir(arg1))
printf("chdir failed: %s\n", strerror(errno));
}
static void cmd_pwd(void)
{
char *buf;
if (arg1) {
puts("usage: pwd");
return;
}
buf = malloc(MAXPATHLEN);
if (! buf) {
printf("malloc %u bytes failed: %s\n", MAXPATHLEN, strerror(errno));
return;
}
if (verbose)
printf("Buffer addr: %p\n", buf);
if (!getcwd(buf, MAXPATHLEN)) {
printf("getcwd failed: %s\n", strerror(errno));
free(buf);
return;
}
puts(buf);
free(buf);
}
#endif /* #ifdef HAVE_SUBDIRS */
static void cmd_rename(void)
{
if (!arg2 || arg3) {
puts("usage: mv <oldname> <newname>");
return;
}
#ifdef UPPERCASE
strupr(arg1);
strupr(arg2);
#endif
if (rename(arg1, arg2))
printf("rename failed: %s\n", strerror(errno));
}
static void cmd_exec(void)
{
char *progname, *arguments;
progname = strtok(args, " \t\n");
if (! progname) {
puts("usage: exec <progname> [arguments]");
return;
}
arguments = strtok(NULL, "");
/*printf("exec: %s %s\n", progname, arguments ? arguments : "");*/
(void)exec(progname, arguments);
printf("exec error: %s\n", strerror(errno));
}
static void cmd_copy(void)
{
int srcfd = -1, dstfd = -1;
char *buf;
int readsz, writesz;
if (!arg2 || arg3) {
puts("usage: cp <src> <dest>");
return;
}
#ifdef UPPERCASE
strupr(arg1);
strupr(arg2);
#endif
buf = malloc(cpbuf_sz);
if (! buf) {
printf("malloc %u bytes failed: %s\n", cpbuf_sz, strerror(errno));
return;
}
if (verbose)
printf("Buffer addr: %p\n", buf);
while (1) {
if (srcfd == -1) {
srcfd = open(arg1, O_RDONLY);
if (srcfd < 0) {
printf("open(%s) failed: %s\n", arg1, strerror(errno));
break;
}
}
readsz = read(srcfd, buf, cpbuf_sz);
if (readsz < 0) {
printf("read error: %s\n", strerror(errno));
break;
}
if (! readsz)
break;
if (dstfd == -1) {
dstfd = open(arg2, O_WRONLY | O_CREAT | O_TRUNC, 0777);
if (dstfd < 0) {
printf("open(%s) failed: %s\n", arg2, strerror(errno));
break;
}
}
writesz = write(dstfd, buf, readsz);
if (writesz < 0 || writesz != readsz) {
printf("write error: %s\n", strerror(errno));
break;
}
if (readsz != cpbuf_sz)
break;
}
free(buf);
if (srcfd >= 0) close(srcfd);
if (dstfd >= 0) close(dstfd);
}
#ifdef __ATARI__
static void cmd_cls(void)
{
printf("\f");
}
#endif
static void cmd_verbose(void)
{
unsigned long verb;
char *endptr;
if (!arg1 || arg2) {
puts("usage: verbose <level>");
return;
}
verb = strtoul(arg1, &endptr, 10);
if (verb > 255 || *endptr) {
puts("invalid verbosity level");
return;
}
verbose = verb;
printf("verbosity level set to %d\n", verbose);
}
static void run_command(void)
{
switch (cmd) {
default: puts("internal error"); return;
case CMD_NOTHING: return;
case CMD_INVALID: puts("invalid command"); return;
case CMD_HELP: cmd_help(); return;
case CMD_QUIT: terminate = 1; return;
case CMD_LS: cmd_ls(); return;
case CMD_RM: cmd_rm(); return;
#ifdef HAVE_SUBDIRS
case CMD_CHDIR: cmd_chdir(); return;
case CMD_MKDIR: cmd_mkdir(); return;
case CMD_RMDIR: cmd_rmdir(); return;
case CMD_PWD: cmd_pwd(); return;
#endif
case CMD_EXEC: cmd_exec(); return;
case CMD_RENAME: cmd_rename(); return;
case CMD_COPY: cmd_copy(); return;
#ifdef __ATARI__
case CMD_CLS: cmd_cls(); return;
#endif
case CMD_VERBOSE: cmd_verbose(); return;
}
}
int main(void)
{
banner();
while (! terminate) {
get_command();
run_command();
}
return 0;
}
/* Local Variables: */
/* c-file-style: "cpg" */
/* c-basic-offset: 4 */
/* End: */
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