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esh.c
2379 lines (2085 loc) · 53.7 KB
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esh.c
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/**
* @brief E-Shell
*
* This is "experimental shell" - a vaguely-unix-like command
* interface. It has a very rudimentary parser that understands
* some things like pipes or writing out to a file. It has a
* handful of built-in commands, including ones that implement
* some more useful shell syntax such as loops and conditionals.
* There is support for tab completion of filenames and commands.
*
* @copyright
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2013-2022 K. Lange
*/
#define _XOPEN_SOURCE 500
#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <dirent.h>
#include <signal.h>
#include <getopt.h>
#include <termios.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <wchar.h>
#include <sys/time.h>
#include <sys/times.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include <toaru/list.h>
#include <toaru/hashmap.h>
#include <toaru/kbd.h>
#include <toaru/rline.h>
#include <toaru/decodeutf8.h>
#ifndef environ
extern char **environ;
#endif
#define PIPE_TOKEN "\xFF\xFFPIPE\xFF\xFF"
#define STAR_TOKEN "\xFF\xFFSTAR\xFF\xFF"
#define WRITE_TOKEN "\xFF\xFFWRITE\xFF\xFF"
#define WRITE_ERR_TOKEN "\xFF\xFFWRITEERR\xFF\xFF"
#define APPEND_TOKEN "\xFF\xFF""APPEND\xFF"
/* A shell command is like a C program */
typedef uint32_t(*shell_command_t) (int argc, char ** argv);
/* We have a static array that fits a certain number of them. */
int SHELL_COMMANDS = 64;
char ** shell_commands; /* Command names */
shell_command_t * shell_pointers; /* Command functions */
char ** shell_descript; /* Command descriptions */
FILE * shell_stderr; /* specifically for `time` */
/* This is the number of actual commands installed */
int shell_commands_len = 0;
int shell_interactive = 1;
int last_ret = 0;
char ** shell_argv = NULL;
int shell_argc = 0;
static int current_line = 0;
static char * current_file = NULL;
int pid; /* Process ID of the shell */
int my_pgid;
int is_subshell = 0;
struct semaphore {
int fds[2];
};
struct semaphore create_semaphore(void) {
struct semaphore out;
pipe(out.fds);
return out;
}
void raise_semaphore(struct semaphore s){
write(s.fds[1],"x",1);
close(s.fds[0]);
close(s.fds[1]);
}
void wait_semaphore(struct semaphore s) {
close(s.fds[1]);
char buf;
read(s.fds[0], &buf, 1);
close(s.fds[0]);
}
void set_pgid(int pgid) {
if (shell_interactive == 1) {
setpgid(0, pgid);
}
}
void set_pgrp(int pgid) {
if (shell_interactive == 1 && !is_subshell) {
sigset_t ss;
sigfillset(&ss);
sigprocmask(SIG_SETMASK, &ss, NULL);
tcsetpgrp(STDIN_FILENO, pgid);
sigemptyset(&ss);
sigprocmask(SIG_SETMASK, &ss, NULL);
}
}
void reset_pgrp() {
set_pgrp(my_pgid);
}
void shell_install_command(char * name, shell_command_t func, char * desc) {
if (shell_commands_len == SHELL_COMMANDS-1) {
SHELL_COMMANDS *= 2;
shell_commands = realloc(shell_commands, sizeof(char *) * SHELL_COMMANDS);
shell_pointers = realloc(shell_pointers, sizeof(shell_command_t) * SHELL_COMMANDS);
shell_descript = realloc(shell_descript, sizeof(char *) * SHELL_COMMANDS);
}
shell_commands[shell_commands_len] = name;
shell_pointers[shell_commands_len] = func;
shell_descript[shell_commands_len] = desc;
shell_commands_len++;
shell_commands[shell_commands_len] = NULL;
}
shell_command_t shell_find(char * str) {
for (int i = 0; i < shell_commands_len; ++i) {
if (!strcmp(str, shell_commands[i])) {
return shell_pointers[i];
}
}
return NULL;
}
void install_commands();
/* Maximum command length */
#define LINE_LEN 4096
/* Current working directory */
char cwd[1024] = {'/',0};
/* Username */
char username[1024];
/* Hostname for prompt */
char _hostname[256];
/* function to update the cached username */
void getuser() {
char * tmp = getenv("USER");
if (tmp) {
strcpy(username, tmp);
} else {
sprintf(username, "%d", getuid());
}
}
/* function to update the cached hostname */
void gethost() {
struct utsname buf;
uname(&buf);
int len = strlen(buf.nodename);
memcpy(_hostname, buf.nodename, len+1);
}
int display_width_of_string(const char * str) {
uint8_t * s = (uint8_t *)str;
int out = 0;
uint32_t c, state = 0;
while (*s) {
if (!decode(&state, &c, *s)) {
out += wcwidth(c);
} else if (state == UTF8_REJECT) {
state = 0;
}
s++;
}
return out;
}
void print_extended_ps(char * format, char * buffer, int * display_width) {
/* Get the time */
struct tm * timeinfo;
struct timeval now;
gettimeofday(&now, NULL); //time(NULL);
timeinfo = localtime((time_t *)&now.tv_sec);
/* Format the date and time for prompt display */
char date_buffer[80];
strftime(date_buffer, 80, "%m/%d", timeinfo);
char time_buffer[80];
strftime(time_buffer, 80, "%H:%M:%S", timeinfo);
/* Collect the current working directory */
getcwd(cwd, 512);
char _cwd[512];
strcpy(_cwd, cwd);
/* Collect the user's home directory and apply it to cwd */
char * home = getenv("HOME");
if (home && strstr(cwd, home) == cwd) {
char * c = cwd + strlen(home);
if (*c == '/' || *c == 0) {
sprintf(_cwd, "~%s", c);
}
}
char ret[80] = {0};
if (last_ret != 0) {
sprintf(ret, "%d ", last_ret);
}
size_t offset = 0;
int is_visible = 1;
char dispchars[1024] = {0};
char * dispout = dispchars;
while (*format) {
if (*format == '\\') {
format++;
switch (*format) {
case '\\':
buffer[offset++] = *format;
if (is_visible) *dispout++ = *format;
format++;
break;
case '[':
is_visible = 0;
format++;
break;
case ']':
is_visible = 1;
format++;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
{
int i = (*format) - '0';
format++;
if (*format >= '0' && *format <= '7') {
i *= 8;
i += (*format) - '0';
format++;
if (*format >= '0' && *format <= '7') {
i *= 8;
i += (*format) - '0';
format++;
}
}
buffer[offset++] = i;
if (is_visible) *dispout++ = i;
}
break;
case 'e':
buffer[offset++] = '\033';
if (is_visible) *dispout++ = '\033';
format++;
break;
case 'd':
{
int size = sprintf(buffer+offset, "%s", date_buffer);
offset += size;
if (is_visible) { dispout += sprintf(dispout, "%s", date_buffer); }
}
format++;
break;
case 't':
{
int size = sprintf(buffer+offset, "%s", time_buffer);
offset += size;
if (is_visible) { dispout += sprintf(dispout, "%s", time_buffer); }
}
format++;
break;
case 'h':
{
int size = sprintf(buffer+offset, "%s", _hostname);
offset += size;
if (is_visible) { dispout += sprintf(dispout, "%s", _hostname); }
}
format++;
break;
case 'u':
{
int size = sprintf(buffer+offset, "%s", username);
offset += size;
if (is_visible) { dispout += sprintf(dispout, "%s", username); }
}
format++;
break;
case 'w':
{
int size = sprintf(buffer+offset, "%s", _cwd);
offset += size;
if (is_visible) { dispout += sprintf(dispout, "%s", _cwd); }
}
format++;
break;
case '$':
buffer[offset++] = (getuid() == 0 ? '#' : '$');
if (is_visible) *dispout++ = (getuid() == 0 ? '#' : '$');
format++;
break;
case 'U': /* prompt color string */
{
int size = sprintf(buffer+offset, "%s", getuid() == 0 ? "\033[1;38;5;196m" : "\033[1;38;5;47m");
offset += size;
/* Does not affect size */
}
format++;
break;
case 'r':
{
int size = sprintf(buffer+offset, "%s", ret);
offset += size;
if (is_visible) { dispout += sprintf(dispout, "%s", ret); }
}
format++;
break;
default:
{
int size = sprintf(buffer+offset, "\\%c", *format);
offset += size;
if (is_visible) { dispout += sprintf(dispout, "\\%c", *format); }
}
format++;
break;
}
} else {
buffer[offset++] = *format;
if (is_visible) *dispout++ = *format;
format++;
}
}
*display_width = display_width_of_string(dispchars);
buffer[offset] = '\0';
}
volatile int break_while = 0;
pid_t suspended_pgid = 0;
hashmap_t * job_hash = NULL;
hashmap_t * desc_hash = NULL;
void sig_break_loop(int sig) {
/* Interrupt handler */
if ((shell_interactive == 1 && !is_subshell)) {
break_while = sig;
signal(sig, sig_break_loop);
} else {
signal(sig, SIG_DFL);
raise(sig);
}
}
void tab_complete_func(rline_context_t * c) {
char * dup = malloc(LINE_LEN);
memcpy(dup, c->buffer, LINE_LEN);
char *pch, *save;
char *argv[1024];
int argc = 0;
int cursor = 0;
pch = strtok_r(dup, " ", &save);
if (!pch) {
argv[0] = "";
argc = 0;
}
while (pch != NULL) {
if (pch - dup <= c->offset) cursor = argc;
argv[argc] = pch;
++argc;
pch = strtok_r(NULL, " ", &save);
}
argv[argc] = NULL;
if (c->offset && c->buffer[c->offset-1] == ' ' && argc) {
cursor++;
}
char * word = argv[cursor];
int word_offset = word ? (c->offset - (argv[cursor] - dup)) : 0;
char * prefix = malloc(word_offset + 1);
if (word) memcpy(prefix, word, word_offset);
prefix[word_offset] = '\0';
/* Complete file path */
list_t * matches = list_create();
char * match = NULL;
int free_matches = 0;
int no_space_if_only = 0;
/* TODO custom auto-complete as a configuration file? */
#define COMPLETE_FILE 1
#define COMPLETE_COMMAND 2
#define COMPLETE_CUSTOM 3
#define COMPLETE_VARIABLE 4
int complete_mode = COMPLETE_FILE;
int with_dollar = 0;
int command_adj = 0;
int cursor_adj = cursor;
while (command_adj < argc && strstr(argv[command_adj],"=")) {
cursor_adj -= 1;
command_adj += 1;
}
/* Various commands are generally prefixes */
if (command_adj < argc && (
!strcmp(argv[command_adj], "sudo") ||
!strcmp(argv[command_adj], "gsudo") ||
!strcmp(argv[command_adj], "time") ||
/* TODO: Both of these may take additional arguments... */
!strcmp(argv[command_adj], "strace") ||
!strcmp(argv[command_adj], "dbg")
)) {
cursor_adj -= 1;
command_adj += 1;
}
/* initial tab completion should be commands, unless typing a file path */
if (cursor_adj == 0 && !strchr(prefix,'/')) {
complete_mode = COMPLETE_COMMAND;
}
if (cursor_adj >= 1 && !strcmp(argv[command_adj], "toggle-abs-mouse")) {
complete_mode = COMPLETE_CUSTOM;
}
if (cursor_adj >= 1 && !strcmp(argv[command_adj], "msk")) {
complete_mode = COMPLETE_CUSTOM;
}
if (cursor_adj >= 1 && !strcmp(argv[command_adj], "ifconfig")) {
complete_mode = COMPLETE_CUSTOM;
}
if (cursor_adj >= 1 && !strcmp(argv[command_adj], "unset")) {
complete_mode = COMPLETE_VARIABLE;
}
/* complete variable names */
if (*prefix == '$') {
complete_mode = COMPLETE_VARIABLE;
with_dollar = 1;
}
if (complete_mode == COMPLETE_COMMAND) {
/* Complete a command name */
for (int i = 0; i < shell_commands_len; ++i) {
if (strstr(shell_commands[i], prefix) == shell_commands[i]) {
list_insert(matches, shell_commands[i]);
match = shell_commands[i];
}
}
} else if (complete_mode == COMPLETE_FILE) {
/* Complete a file path */
free_matches = 1;
char * tmp = strdup(prefix);
char * last_slash = strrchr(tmp, '/');
DIR * dirp;
char * compare = prefix;
if (last_slash) {
*last_slash = '\0';
word = word + (last_slash - tmp) + 1;
word_offset = word_offset - (last_slash - tmp + 1);
compare = word;
if (last_slash == tmp) {
dirp = opendir("/");
} else {
char * home;
if (*tmp == '~' && (home = getenv("HOME"))) {
char * t = malloc(strlen(tmp) + strlen(home) + 4);
sprintf(t, "%s%s",home,tmp+1);
dirp = opendir(t);
free(t);
} else {
dirp = opendir(tmp);
}
}
} else {
dirp = opendir(".");
}
if (!dirp) {
free(tmp);
goto finish_tab;
}
struct dirent * ent = readdir(dirp);
while (ent != NULL) {
if (ent->d_name[0] != '.' || compare[0] == '.') {
if (!word || strstr(ent->d_name, compare) == ent->d_name) {
struct stat statbuf;
/* stat it */
if (last_slash) {
char * x;
char * home;
if (tmp[0] == '~' && (home = getenv("HOME"))) {
x = malloc(strlen(tmp) + 1 + strlen(ent->d_name) + 1 + strlen(home) + 1);
snprintf(x, strlen(tmp) + 1 + strlen(ent->d_name) + 1 + strlen(home) + 1, "%s%s/%s",home,tmp+1,ent->d_name);
} else {
x = malloc(strlen(tmp) + 1 + strlen(ent->d_name) + 1);
snprintf(x, strlen(tmp) + 1 + strlen(ent->d_name) + 1, "%s/%s",tmp,ent->d_name);
}
lstat(x, &statbuf);
free(x);
} else {
lstat(ent->d_name, &statbuf);
}
char * s;
if (S_ISDIR(statbuf.st_mode)) {
s = malloc(strlen(ent->d_name) + 2);
sprintf(s,"%s/", ent->d_name);
no_space_if_only = 1;
} else {
s = strdup(ent->d_name);
}
list_insert(matches, s);
match = s;
}
}
ent = readdir(dirp);
}
closedir(dirp);
free(tmp);
} else if (complete_mode == COMPLETE_CUSTOM) {
char * none[] = {NULL};
char ** completions = none;
char * toggle_abs_mouse_completions[] = {"relative","absolute",NULL};
char * msk_commands[] = {"update","install","list","count","--version",NULL};
char * ifconfig_commands[] = {"inet","netmask","gateway",NULL};
if (!strcmp(argv[command_adj],"toggle-abs-mouse")) {
completions = toggle_abs_mouse_completions;
} else if (!strcmp(argv[command_adj], "msk")) {
if (cursor_adj == 1) {
completions = msk_commands;
} else if (cursor_adj > 1 && !strcmp(argv[command_adj+1],"install")) {
FILE * f = fopen("/var/msk/manifest","r");
list_t * packages = list_create();
if (f) {
while (!feof(f)) {
char tmp[4096] = {0};
if (!fgets(tmp, 4096, f)) break;
if (tmp[0] == '[') {
char * s = strstr(tmp, "]");
if (s) { *s = '\0'; }
list_insert(packages, strdup(tmp+1));
}
}
completions = malloc(sizeof(char *) * (packages->length + 1));
free_matches = 1;
size_t i = 0;
foreach(node, packages) {
completions[i++] = node->value;
}
completions[i] = NULL;
list_free(packages);
}
}
} else if (!strcmp(argv[command_adj], "ifconfig")) {
if (cursor_adj == 1) {
/* interface names */
DIR * d = opendir("/dev/net");
if (d) {
free_matches = 1;
list_t * interfaces = list_create();
struct dirent * ent;
while ((ent = readdir(d))) {
if (ent->d_name[0] == '.') continue;
list_insert(interfaces, strdup(ent->d_name));
}
closedir(d);
completions = malloc(sizeof(char*) * (interfaces->length + 1));
size_t i = 0;
foreach(node, interfaces) {
completions[i++] = node->value;
}
completions[i] = NULL;
list_free(interfaces);
}
} else if (cursor_adj > 1) {
completions = ifconfig_commands;
}
}
while (*completions) {
if (strstr(*completions, prefix) == *completions) {
list_insert(matches, *completions);
match = *completions;
}
completions++;
}
} else if (complete_mode == COMPLETE_VARIABLE) {
char ** envvar = environ;
free_matches = 1;
while (*envvar) {
char * tmp = strdup(*envvar);
char * c = strchr(tmp, '=');
*c = '\0';
if (strstr(tmp, prefix+with_dollar) == tmp) {
char * m = malloc(strlen(tmp)+1+with_dollar);
sprintf(m, "%s%s", with_dollar ? "$" : "", tmp);
list_insert(matches, m);
match = m;
}
free(tmp);
envvar++;
}
}
if (matches->length == 1) {
/* Insert */
rline_insert(c, &match[word_offset]);
if (word && word_offset == (int)strlen(word) && !no_space_if_only) {
rline_insert(c, " ");
}
rline_redraw(c);
} else if (matches->length > 1) {
if (!c->tabbed) {
/* see if there is a minimum subset we can fill in */
size_t j = word_offset;
do {
char d = match[j];
int diff = 0;
foreach(node, matches) {
char * match = (char *)node->value;
if (match[j] != d || match[j] == '\0') diff = 1;
}
if (diff) break;
j++;
} while (j < (size_t)c->requested);
if (j > (size_t)word_offset) {
char * tmp = strdup(match);
tmp[j] = '\0';
rline_insert(c, &tmp[word_offset]);
rline_redraw(c);
free(tmp);
} else {
c->tabbed = 1;
}
} else {
/* Print matches */
fprintf(stderr,"\n\033[0m");
size_t j = 0;
foreach(node, matches) {
char * match = (char *)node->value;
fprintf(stderr, "%s", match);
++j;
if (j < matches->length) {
fprintf(stderr, ", ");
}
}
fprintf(stderr,"\n");
c->callbacks->redraw_prompt(c);
fprintf(stderr, "\033[s");
rline_redraw(c);
}
}
finish_tab:
if (free_matches) list_destroy(matches);
list_free(matches);
free(prefix);
free(dup);
}
void add_argument(list_t * argv, char * buf) {
char * c = malloc(strlen(buf) + 1);
memcpy(c, buf, strlen(buf) + 1);
list_insert(argv, c);
}
void add_environment(list_t * env) {
if (env->length) {
foreach (node, env) {
char * c = node->value;
putenv(strdup(c));
}
}
}
#define FALLBACK_PS1 "\\u@\\h \\w\\$ "
int read_entry(char * buffer) {
char lprompt[1024], rprompt[1024];
int lwidth, rwidth;
char * ps1 = getenv("PS1_LEFT");
print_extended_ps(ps1 ? ps1 : FALLBACK_PS1, lprompt, &lwidth);
char * ps1r = getenv("PS1_RIGHT");
print_extended_ps(ps1r ? ps1r : "", rprompt, &rwidth);
rline_exit_string="exit";
rline_exp_set_syntax("esh");
rline_exp_set_prompts(lprompt, rprompt, lwidth, rwidth);
rline_exp_set_shell_commands(shell_commands, shell_commands_len);
rline_exp_set_tab_complete_func(tab_complete_func);
return rline(buffer, LINE_LEN);
}
int read_entry_continued(char * buffer) {
rline_exit_string="exit";
rline_exp_set_syntax("esh");
rline_exp_set_prompts("> ", "", 2, 0);
rline_exp_set_shell_commands(shell_commands, shell_commands_len);
rline_exp_set_tab_complete_func(tab_complete_func);
return rline(buffer, LINE_LEN);
}
int variable_char(uint8_t c) {
if (c >= 'A' && c <= 'Z') return 1;
if (c >= 'a' && c <= 'z') return 1;
if (c >= '0' && c <= '9') return 1;
if (c == '_') return 1;
return 0;
}
int variable_char_first(uint8_t c) {
if (c == '?') return 1;
if (c == '$') return 1;
if (c == '#') return 1;
return 0;
}
struct alternative {
const char * command;
const char * replacement;
const char * description;
};
#define ALT_BIM "bim", "vi-like text editor"
#define ALT_FETCH "fetch", "URL downloader"
#define ALT_NETIF "ifconfig", "to see network configuration"
static struct alternative cmd_alternatives[] = {
/* Propose bim as an alternative for common text editors */
{"vim", ALT_BIM},
{"vi", ALT_BIM},
{"emacs", ALT_BIM},
{"nano", ALT_BIM},
/* Propose fetch for some common URL-getting tools */
{"curl", ALT_FETCH},
{"wget", ALT_FETCH},
/* We don't have ip or ifconfig commands, suggest cat /proc/netif */
{"ipconfig", ALT_NETIF},
{"ip", ALT_NETIF},
/* Some random other stuff */
{"more", "bim -", "paging to a text editor"},
{"less", "bim -", "paging to a text editor"},
{NULL, NULL, NULL},
};
void run_cmd(char ** args) {
int i = execvp(*args, args);
shell_command_t func = shell_find(*args);
if (func) {
int argc = 0;
while (args[argc]) {
argc++;
}
i = func(argc, args);
} else {
if (i != 0) {
if (errno == ENOENT) {
fprintf(stderr, "%s: Command not found\n", *args);
for (struct alternative * alt = cmd_alternatives; alt->command; alt++) {
if (!strcmp(*args, alt->command)) {
fprintf(stderr, "Consider this alternative:\n\n\t%s -- \033[3m%s\033[0m\n\n",
alt->replacement,
alt->description);
break;
}
}
} else if (errno == ELOOP) {
fprintf(stderr, "esh: Bad interpreter (maximum recursion depth reached)\n");
} else if (errno == ENOEXEC) {
fprintf(stderr, "esh: Bad interpreter\n");
} else {
fprintf(stderr, "esh: Invalid executable\n");
}
i = 127;
}
}
exit(i);
}
int is_number(const char * c) {
while (*c) {
if (!isdigit(*c)) return 0;
c++;
}
return 1;
}
/**
* Prints "Segmentation fault", etc.
*/
static void handle_status(int ret_code) {
if (WIFSIGNALED(ret_code)) {
int sig = WTERMSIG(ret_code);
if (sig == SIGINT || sig == SIGPIPE) {
fprintf(stderr, "\n");
return;
}
char * str = strsignal(sig);
if (shell_interactive == 1) {
fprintf(stderr, "%s\n", str);
} else if (shell_interactive == 2) {
fprintf(stderr, "%s: line %d: %s\n", current_file, current_line, str);
}
}
}
static void describe_job(pid_t pid);
int wait_for_child(int pgid, char * name, int retpid) {
int waitee = (shell_interactive == 1 && !is_subshell) ? -pgid : pgid;
int outpid;
int ret_code = 0;
int ret_code_real = 0;
int e;
int _stopped = 0;
do {
outpid = waitpid(waitee, &ret_code, WSTOPPED);
e = errno;
if (outpid == retpid) {
ret_code_real = ret_code;
}
if (outpid != -1 && WIFSTOPPED(ret_code)) {
suspended_pgid = pgid;
if (name) {
void * old = hashmap_set(job_hash, (void*)(intptr_t)pgid, strdup(name));
if (old) free(old);
}
void * old = hashmap_set(desc_hash, (void*)(intptr_t)pgid, strdup(WSTOPSIG(ret_code) ? strsignal(WSTOPSIG(ret_code)) : "Stopped"));
if (old) free(old);
_stopped = 1;
if (!shell_interactive) continue;
break;
} else if (outpid != -1) {
suspended_pgid = 0;
if (hashmap_has(job_hash, (void*)(intptr_t)pgid)) {
hashmap_remove(job_hash, (void*)(intptr_t)pgid);
hashmap_remove(desc_hash, (void*)(intptr_t)pgid);
}
}
} while (outpid != -1 || (outpid == -1 && e != ECHILD));
reset_pgrp();
handle_status(ret_code_real);
if (_stopped && shell_interactive) {
fprintf(stderr, "\n");
describe_job(pgid);
}
return WEXITSTATUS(ret_code_real);
}
int shell_exec(char * buffer, size_t size, FILE * file, char ** out_buffer) {
*out_buffer = NULL;
/* Read previous history entries */
if (buffer[0] == '!') {
int x = atoi((char *)((uintptr_t)buffer + 1));
if (x > 0 && x <= rline_history_count) {
buffer = rline_history_get(x - 1);
} else {
fprintf(stderr, "esh: !%d: event not found\n", x);
return 0;
}
}
char * argv[1024];
int tokenid = 0;
char quoted = 0;
char backtick = 0;
char buffer_[512] = {0};
int collected = 0;
int force_collected = 0;
list_t * args = list_create();
int have_star = 0;
while (1) {
char * p = buffer;
while (*p) {
switch (*p) {
case '$':
if (quoted == '\'') {
goto _just_add;
} else {
if (backtick) {
goto _just_add;
}
p++;
char var[100];
int coll = 0;
if (*p == '{') {
p++;
while (*p != '}' && *p != '\0' && (coll < 100)) {
var[coll] = *p;
coll++;
var[coll] = '\0';
p++;
}
if (*p == '}') {
p++;
}
} else {
while (*p != '\0' && (variable_char(*p) || (coll == 0 && variable_char_first(*p))) && (coll < 100)) {
var[coll] = *p;
coll++;
var[coll] = '\0';
if (coll == 1 && (isdigit(*p) || *p == '?' || *p == '$' || *p == '#')) {
p++;
break; /* Don't let these keep going */
}
p++;
}
}
/* Special cases */
char *c = NULL;
char tmp[128];
if (!strcmp(var, "?")) {
sprintf(tmp,"%d",last_ret);
c = tmp;
} else if (!strcmp(var, "$")) {
sprintf(tmp,"%d",getpid());
c = tmp;
} else if (!strcmp(var, "#")) {
sprintf(tmp,"%d",shell_argc ? shell_argc-1 : 0);
c = tmp;
} else if (is_number(var)) {
int a = atoi(var);
if (a >= 0 && a < shell_argc) {
c = shell_argv[a];
}
} else if (!strcmp(var, "RANDOM")) {
sprintf(tmp,"%d",rand()%32768); /* sure, modulo is bad for range restriction, shut up */
c = tmp;
} else {
c = getenv(var);
}
if (c) {
backtick = 0;
for (int i = 0; i < (int)strlen(c); ++i) {