#include <tce/syscall.h>
#include <tce/vfs.h>
#include <stdlib.h>
#include <stdio.h>
FILE out, cwd_f;
char *cwd;
void about() {
fprint(out, "Trivial/Computing Environment v0.1.0 - yosh 2.\n");
}
void help(char *args[]) {
if (args[1] == 0) {
fprint(out, "Available commands: about, help, exit, ls, cd, switch.\n");
} else if (strcmp(args[1], "about") == 0) {
fprint(out, "Usage:\tabout\nShows some info about yosh. Very usefull.\n");
} else if (strcmp(args[1], "help") == 0) {
fprint(out, "Usage:\thelp\n\thelp <command>\n");
fprint(out, "Shows some info about the command you want, or commands in general.\n");
} else if (strcmp(args[1], "exit") == 0) {
fprint(out, "Usage:\texit\n");
fprint(out, "Exits the shell.\nWill probably make your system panic if you only have a shell running.\n");
} else if (strcmp(args[1], "cd") == 0) {
fprint(out, "Usage:\tcd <location>\nGoes to the location specified.\n");
} else if (strcmp(args[1], "ls") == 0) {
fprint(out, "Usage:\tls\n\tls <location>...\nShows the content of the current/specified directory.\n");
} else if (strcmp(args[1], "switch") == 0) {
fprint(out, "Usage:\tswitch <vt name>\nSwitchs focus to specified virtual terminal.\n");
fprint(out, "Type `ls /.ui` to see available terminals.\n");
} else {
fprintf(out, "No such command: %s\n", args[1]);
}
}
void simplify_path(char* p) {
char *it = p;
char *member = it;
while (*it != 0) {
if (*it == '/') {
if (it == member && it != p) {
// two consecutive slashes
char *i = member;
while (1) {
i[0] = i[1];
if (i[0] == 0) break;
i++;
}
} else {
*it = 0;
if (strcmp(member, ".") == 0) {
char *i = member;
while (1) {
i[0] = i[2];
if (i[0] == 0) break;
i++;
}
} else if (strcmp(member, "..") == 0) {
*it = '/';
char* start = member - 2;
char* next = member + 3;
while (start > p && *start != '/') {
start--;
}
start++;
it = member = start;
while (1) {
*start = *next;
if (*start == 0) break;
start++;
next++;
}
} else {
*it = '/';
it++;
member = it;
}
}
} else {
it++;
}
}
}
char* path_cat (char* a, char* b) {
char* ret;
if (b[0] == '/') {
int lb = strlen(b);
ret = (char*)malloc(lb + 2);
memcpy(ret, b, lb);
if (ret[lb - 1] != '/') {
ret[lb] = '/';
lb++;
}
ret[lb] = 0;
} else {
int la = strlen(a);
int lb = strlen(b);
ret = (char*)malloc(la + lb + 2);
memcpy(ret, a, la);
memcpy(ret + la, b, lb);
if (ret[la + lb - 1] != '/') {
ret[la + lb] = '/';
lb++;
}
ret[la + lb] = 0;
}
simplify_path(ret);
return ret;
}
void cd(char **args) {
if (args[1] == 0) {
fprint(out, "Usage: cd <directory>\n");
}
if (strcmp(args[1], ".") == 0) return;
char* newcwd = path_cat(cwd, args[1]);
file_info info;
int i = stat(newcwd, &info);
if (i == E_NOT_FOUND) {
fprint(out, "No such file or directory.\n");
free(newcwd);
} else if (i < 0) {
fprintf(out, "Error stating: %i\n", i);
free(newcwd);
} else if ((info.type & FT_DIR) == 0) {
fprint(out, "Not a directory.\n");
free(newcwd);
} else {
FILE nf = open(newcwd, 0);
if (nf <= 0) {
fprintf(out, "Error opening: %i\n", nf);
free(newcwd);
} else {
free(cwd);
cwd = newcwd;
close(cwd_f);
cwd_f = nf;
}
}
}
void ls_dir(FILE f) {
file_info info;
int i = 0;
char buf[256];
while (read(f, i, 256, buf) > 0) {
i++;
if (strcmp(buf, ".") == 0 || strcmp(buf, "..") == 0) continue;
fprintf(out, " %s", buf);
stat_relative(f, buf, &info);
if (info.type & FT_DIR) fprint(out, "/");
fprint(out, " \t");
if (info.type & FT_FILE) fprint(out, "file ");
if (info.type & FT_DIR) fprint(out, "dir ");
if (info.type & FT_SYMLINK) fprint(out, "symlink ");
if (info.type & FT_DEV) fprint(out, "dev ");
if (info.type & FT_TERMINAL) fprint(out, "term ");
fprint(out, "\t");
if (info.type & FT_TERMINAL) {
fprintf(out, "%ix%i", info.size >> 16, info.size & 0xFFFF);
} else if ((info.type & FT_DEV) == 0) {
fprintf(out, "%i", info.size);
}
fprint(out, "\n");
}
}
void ls(char **args) {
if (args[1] == 0) {
ls_dir(cwd_f);
} else {
int i;
for (i = 1; args[i] != 0; i++) {
fprintf(out, "Contents of %s :\n", args[i]);
char* d = path_cat(cwd, args[i]);
file_info info;
int e = stat(d, &info);
if (e == E_NOT_FOUND) {
fprint(out, " No such file or directory\n");
} else if (e < 0) {
fprintf(out, " Error stating: %i\n", e);
} else {
FILE ff = open(d, 0);
if (ff <= 0) {
fprintf(out, " Error opening: %i\n", ff);
} else {
ls_dir(ff);
close(ff);
}
}
free(d);
}
}
}
void t_switch(char** args) {
if (args[1] == 0) {
fprint(out, "Usage: switch <vt_name>\n");
return;
}
char* p = path_cat("/.ui/", args[1]);
int i;
if ((i = link(p, "/.dev/vgatxt", LM_OUTPUT_TO)) == 0) {
link("/.dev/ps2kbd", p, LM_OUTPUT_TO);
} else {
fprintf(out, "Error %i\n", i);
}
}
int main(char **sh_args) {
out = open("/.ui/home", 0);
if (out <= 0) {
return -1;
}
about();
cwd = strdup("/");
cwd_f = open(cwd, 0);
while (1) {
fprintf(out, " %s ", cwd);
char *s = freadln(out);
if (s == 0) return -1;
int l = strlen(s);
if (s[l-1] == '\n') {
s[l-1] = 0; l--;
char *c_args[16] = {0}, *cmd;
c_args[0] = s;
int argc = 1;
for (cmd = s; *cmd != 0; cmd++) {
if (*cmd == ' ') {
*cmd = 0;
if (cmd[1] != ' ' && cmd[1] != 0) {
c_args[argc] = cmd + 1;
argc++;
if (argc == 15) break;
}
}
}
if (strcmp(c_args[0], "about") == 0) {
about();
} else if (strcmp(c_args[0], "help") == 0) {
help(c_args);
} else if (strcmp(c_args[0], "exit") == 0) {
fprint(out, "Exiting the shell. See you later!\n");
break;
} else if (strcmp(c_args[0], "cd") == 0) {
cd(c_args);
} else if (strcmp(c_args[0], "ls") == 0) {
ls(c_args);
} else if (strcmp(c_args[0], "switch") == 0) {
t_switch(c_args);
} else {
char *c = path_cat(cwd, c_args[0]);
int pid = run(c, c_args + 1);
if (pid <= 0) {
fprintf(out, "Error %i\n", pid);
} else {
int ret = waitpid(pid);
fprintf(out, "Exited with status %i\n", ret);
}
free(c);
}
} else {
fprint(out, "[freadln fail, sorry.]\n");
}
free(s);
}
return 0;
}
