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- added support for changing current working directory

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- added cd, pwd command
This commit is contained in:
Nicolas Berr 2011-09-23 15:31:44 +02:00
parent b1a968a82c
commit 903f33f40b
1 changed files with 72 additions and 11 deletions
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83
newlib/examples/mshell.c
View file

@ -24,7 +24,9 @@
#include <ctype.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#undef errno
extern int errno;
void showlogo() {
@ -35,14 +37,22 @@ void showlogo() {
}
void help() {
printf("possible commands: \n");
printf("exit > exit shell \n");
printf("shell builtin commands: \n");
printf("cd <path>:\t change current working directory to path\n");
printf("pwd :\t show current working directory\n");
printf("help :\t this short help\n");
printf("exit :\t exit the shell \n");
}
#define MAXARGS 16
#define MAXARGS 16
#define MAXPATH 128
#define MAXCMDLINE 1024
#define ST_WHITE 0
#define ST_ARG 1
#define ST_ARG 1
#define ST_QUOTE 2
#define USE_STAT 0
char** splitargs(char* args) {
static char* ret[MAXARGS+1];
@ -51,14 +61,22 @@ char** splitargs(char* args) {
while (*args != '\0') {
if (state == ST_WHITE) {
if (!isspace(*args)) {
if(*args == '"') {
args++;
state = ST_QUOTE;
if (*args == '\0')
break;
}
else {
state = ST_ARG;
}
ret[i++] = args;
if (i == MAXARGS)
break;
state = ST_ARG;
}
}
else {
if (isspace(*args)) {
if ((state == ST_QUOTE && *args == '"') || isspace(*args)) {
*args = '\0';
state = ST_WHITE;
}
@ -70,18 +88,57 @@ char** splitargs(char* args) {
return ret;
}
char* ms_getcwd() {
return getenv("PWD");
}
void ms_setcwd(char* path) {
static char newpath[MAXPATH];
static struct stat stats;
if (path == NULL)
return;
if (*path == NULL)
return;
if (*path == '/') {
strcpy(newpath, path);
}
else {
char* oldpath = ms_getcwd();
if(oldpath[strlen(oldpath)-1] == '/')
sprintf(newpath,"%s%s", oldpath, path);
else
sprintf(newpath,"%s/%s", oldpath, path);
}
#if USE_STAT
if (stat(newpath, &stats)) {
printf("mshell: %s is not a valid path\n", newpath);
return;
}
if (!S_ISDIR(stats.st_mode)) {
printf("mshell: %s is not a directory\n", newpath);
return;
}
#endif
setenv("PWD", newpath, 1);
}
int main(int argc, char** argv)
{
char commandline[1024];
char commandline[MAXCMDLINE];
char* command;
int size = 0, status = 0;
int status = 0;
pid_t pid;
system("clear");
showlogo();
while(1) {
char** newargv;
char* newenv[] = {"USER=root", "PATH=/bin:/sbin:/usr/bin", "PWD=/", "TEMP=/tmp", NULL};
printf("mshell> ");
gets(commandline);
@ -97,12 +154,16 @@ int main(int argc, char** argv)
}
if(!strcmp(command, "help")) {
help();
} else if (!strcmp(command, "pwd")) {
printf("%s\n", ms_getcwd());
} else if (!strcmp(command, "cd")) {
ms_setcwd(newargv[1]);
} else {
char path[128];
char path[MAXPATH];
sprintf(path, "/bin/%s", command);
pid = fork();
if (pid == 0) { //child
status = execve(path, newargv, newenv);
status = execve(path, newargv, environ);
if (status)
printf("mshell: %s: command not found\n", path);
return errno;