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-rw-r--r--toys/other/toysh.c382
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diff --git a/toys/other/toysh.c b/toys/other/toysh.c
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-/* vi: set sw=4 ts=4:
- *
- * toysh - toybox shell
- *
- * Copyright 2006 Rob Landley <rob@landley.net>
- *
- * The spec for this is at:
- * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
- * and http://www.opengroup.org/onlinepubs/009695399/utilities/sh.html
- *
- * There are also specs for:
- * http://www.opengroup.org/onlinepubs/009695399/utilities/cd.html
- * http://www.opengroup.org/onlinepubs/009695399/utilities/exit.html
- *
- * Things like the bash man page are good to read too.
- *
- * TODO: // Handle embedded NUL bytes in the command line.
-
-USE_TOYSH(NEWTOY(cd, NULL, TOYFLAG_NOFORK))
-USE_TOYSH(NEWTOY(exit, NULL, TOYFLAG_NOFORK))
-USE_TOYSH(OLDTOY(sh, toysh, "c:i", TOYFLAG_BIN))
-USE_TOYSH(NEWTOY(toysh, "c:i", TOYFLAG_BIN))
-
-config TOYSH
- bool "sh (toysh)"
- default n
- help
- usage: sh [-c command] [script]
-
- The toybox command shell. Runs a shell script, or else reads input
- interactively and responds to it.
-
- -c command line to execute
-
-config TOYSH_TTY
- bool "Interactive shell (terminal control)"
- default n
- depends on TOYSH
- help
- Add terminal control to toysh. This is necessary for interactive use,
- so the shell isn't killed by CTRL-C.
-
-config TOYSH_PROFILE
- bool "Profile support"
- default n
- depends on TOYSH_TTY
- help
- Read /etc/profile and ~/.profile when running interactively.
-
- Also enables the built-in command "source".
-
-config TOYSH_JOBCTL
- bool "Job Control (fg, bg, jobs)"
- default n
- depends on TOYSH_TTY
- help
- Add job control to toysh. This lets toysh handle CTRL-Z, and enables
- the built-in commands "fg", "bg", and "jobs".
-
- With pipe support, enable use of "&" to run background processes.
-
-config TOYSH_FLOWCTL
- bool "Flow control (if, while, for, functions)"
- default n
- depends on TOYSH
- help
- Add flow control to toysh. This enables the if/then/else/fi,
- while/do/done, and for/do/done constructs.
-
- With pipe support, this enables the ability to define functions
- using the "function name" or "name()" syntax, plus curly brackets
- "{ }" to group commands.
-
-config TOYSH_QUOTES
- bool "Smarter argument parsing (quotes)"
- default n
- depends on TOYSH
- help
- Add support for parsing "" and '' style quotes to the toysh command
- parser, with lets arguments have spaces in them.
-
-config TOYSH_WILDCARDS
- bool "Wildcards ( ?*{,} )"
- default n
- depends on TOYSH_QUOTES
- help
- Expand wildcards in argument names, ala "ls -l *.t?z" and
- "rm subdir/{one,two,three}.txt".
-
-config TOYSH_PROCARGS
- bool "Executable arguments ( `` and $() )"
- default n
- depends on TOYSH_QUOTES
- help
- Add support for executing arguments contianing $() and ``, using
- the output of the command as the new argument value(s).
-
- (Bash calls this "command substitution".)
-
-config TOYSH_ENVVARS
- bool "Environment variable support"
- default n
- depends on TOYSH_QUOTES
- help
- Substitute environment variable values for $VARNAME or ${VARNAME},
- and enable the built-in command "export".
-
-config TOYSH_LOCALS
- bool "Local variables"
- default n
- depends on TOYSH_ENVVARS
- help
- Support for local variables, fancy prompts ($PS1), the "set" command,
- and $?.
-
-config TOYSH_ARRAYS
- bool "Array variables"
- default n
- depends on TOYSH_LOCALS
- help
- Support for ${blah[blah]} style array variables.
-
-config TOYSH_PIPES
- bool "Pipes and redirects ( | > >> < << & && | || () ; )"
- default n
- depends on TOYSH
- help
- Support multiple commands on the same command line. This includes
- | pipes, > >> < redirects, << here documents, || && conditional
- execution, () subshells, ; sequential execution, and (with job
- control) & background processes.
-
-config TOYSH_BUILTINS
- bool "Builtin commands"
- default n
- depends on TOYSH
- help
- Adds the commands exec, fg, bg, help, jobs, pwd, export, source, set,
- unset, read, alias.
-
-config EXIT
- bool
- default n
- depends on TOYSH
- help
- usage: exit [status]
-
- Exit shell. If no return value supplied on command line, use value
- of most recent command, or 0 if none.
-
-config CD
- bool
- default n
- depends on TOYSH
- help
- usage: cd [path]
-
- Change current directory. With no arguments, go to $HOME.
-
-config CD_P
- bool # "-P support for cd"
- default n
- depends on TOYSH
- help
- usage: cd [-PL]
-
- -P Physical path: resolve symlinks in path.
- -L Cancel previous -P and restore default behavior.
-*/
-
-#include "toys.h"
-
-DEFINE_GLOBALS(
- char *command;
-)
-
-#define TT this.toysh
-
-// A single executable, its arguments, and other information we know about it.
-#define TOYSH_FLAG_EXIT 1
-#define TOYSH_FLAG_SUSPEND 2
-#define TOYSH_FLAG_PIPE 4
-#define TOYSH_FLAG_AND 8
-#define TOYSH_FLAG_OR 16
-#define TOYSH_FLAG_AMP 32
-#define TOYSH_FLAG_SEMI 64
-#define TOYSH_FLAG_PAREN 128
-
-// What we know about a single process.
-struct command {
- struct command *next;
- int flags; // exit, suspend, && ||
- int pid; // pid (or exit code)
- int argc;
- char *argv[0];
-};
-
-// A collection of processes piped into/waiting on each other.
-struct pipeline {
- struct pipeline *next;
- int job_id;
- struct command *cmd;
- char *cmdline; // Unparsed line for display purposes
- int cmdlinelen; // How long is cmdline?
-};
-
-// Parse one word from the command line, appending one or more argv[] entries
-// to struct command. Handles environment variable substitution and
-// substrings. Returns pointer to next used byte, or NULL if it
-// hit an ending token.
-static char *parse_word(char *start, struct command **cmd)
-{
- char *end;
-
- // Detect end of line (and truncate line at comment)
- if (CFG_TOYSH_PIPES && strchr("><&|(;", *start)) return 0;
-
- // Grab next word. (Add dequote and envvar logic here)
- end = start;
- while (*end && !isspace(*end)) end++;
- (*cmd)->argv[(*cmd)->argc++] = xstrndup(start, end-start);
-
- // Allocate more space if there's no room for NULL terminator.
-
- if (!((*cmd)->argc & 7))
- *cmd=xrealloc(*cmd,
- sizeof(struct command) + ((*cmd)->argc+8)*sizeof(char *));
- (*cmd)->argv[(*cmd)->argc] = 0;
- return end;
-}
-
-// Parse a line of text into a pipeline.
-// Returns a pointer to the next line.
-
-static char *parse_pipeline(char *cmdline, struct pipeline *line)
-{
- struct command **cmd = &(line->cmd);
- char *start = line->cmdline = cmdline;
-
- if (!cmdline) return 0;
-
- if (CFG_TOYSH_JOBCTL) line->cmdline = cmdline;
-
- // Parse command into argv[]
- for (;;) {
- char *end;
-
- // Skip leading whitespace and detect end of line.
- while (isspace(*start)) start++;
- if (!*start || *start=='#') {
- if (CFG_TOYSH_JOBCTL) line->cmdlinelen = start-cmdline;
- return 0;
- }
-
- // Allocate next command structure if necessary
- if (!*cmd) *cmd = xzalloc(sizeof(struct command)+8*sizeof(char *));
-
- // Parse next argument and add the results to argv[]
- end = parse_word(start, cmd);
-
- // If we hit the end of this command, how did it end?
- if (!end) {
- if (CFG_TOYSH_PIPES && *start) {
- if (*start==';') {
- start++;
- break;
- }
- // handle | & < > >> << || &&
- }
- break;
- }
- start = end;
- }
-
- if (CFG_TOYSH_JOBCTL) line->cmdlinelen = start-cmdline;
-
- return start;
-}
-
-// Execute the commands in a pipeline
-static void run_pipeline(struct pipeline *line)
-{
- struct toy_list *tl;
- struct command *cmd = line->cmd;
- if (!cmd || !cmd->argc) return;
-
- tl = toy_find(cmd->argv[0]);
- // Is this command a builtin that should run in this process?
- if (tl && (tl->flags & TOYFLAG_NOFORK)) {
- struct toy_context temp;
-
- // This fakes lots of what toybox_main() does.
- memcpy(&temp, &toys, sizeof(struct toy_context));
- memset(&toys, 0, sizeof(struct toy_context));
- toy_init(tl, cmd->argv);
- tl->toy_main();
- cmd->pid = toys.exitval;
- free(toys.optargs);
- if (toys.old_umask) umask(toys.old_umask);
- memcpy(&toys, &temp, sizeof(struct toy_context));
- } else {
- int status;
-
- cmd->pid = vfork();
- if (!cmd->pid) xexec(cmd->argv);
- else waitpid(cmd->pid, &status, 0);
-
- if (CFG_TOYSH_FLOWCTL || CFG_TOYSH_PIPES) {
- if (WIFEXITED(status)) cmd->pid = WEXITSTATUS(status);
- if (WIFSIGNALED(status)) cmd->pid = WTERMSIG(status);
- }
- }
-
- return;
-}
-
-// Free the contents of a command structure
-static void free_cmd(void *data)
-{
- struct command *cmd=(struct command *)data;
-
- while(cmd->argc) free(cmd->argv[--cmd->argc]);
-}
-
-
-// Parse a command line and do what it says to do.
-static void handle(char *command)
-{
- struct pipeline line;
- char *start = command;
-
- // Loop through commands in this line
-
- for (;;) {
-
- // Parse a group of connected commands
-
- memset(&line,0,sizeof(struct pipeline));
- start = parse_pipeline(start, &line);
- if (!line.cmd) break;
-
- // Run those commands
-
- run_pipeline(&line);
- llist_traverse(line.cmd, free_cmd);
- }
-}
-
-void cd_main(void)
-{
- char *dest = *toys.optargs ? *toys.optargs : getenv("HOME");
- xchdir(dest);
-}
-
-void exit_main(void)
-{
- exit(*toys.optargs ? atoi(*toys.optargs) : 0);
-}
-
-void toysh_main(void)
-{
- FILE *f;
-
- // Set up signal handlers and grab control of this tty.
- if (CFG_TOYSH_TTY) {
- if (isatty(0)) toys.optflags |= 1;
- }
- f = *toys.optargs ? xfopen(*toys.optargs, "r") : NULL;
- if (TT.command) handle(TT.command);
- else {
- size_t cmdlen = 0;
- for (;;) {
- char *command = 0;
- if (!f) xputc('$');
- if (1 > getline(&command, &cmdlen, f ? f : stdin)) break;
- handle(command);
- free(command);
- }
- }
-
- toys.exitval = 1;
-}
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