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Diffstat (limited to 'toys/posix/sh.c')
| -rw-r--r-- | toys/posix/sh.c | 392 |
1 files changed, 0 insertions, 392 deletions
diff --git a/toys/posix/sh.c b/toys/posix/sh.c deleted file mode 100644 index 2f09f63b..00000000 --- a/toys/posix/sh.c +++ /dev/null @@ -1,392 +0,0 @@ -/* sh.c - toybox shell - * - * Copyright 2006 Rob Landley <rob@landley.net> - * - * The POSIX-2008/SUSv4 spec for this is at: - * http://opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html - * and http://opengroup.org/onlinepubs/9699919799/utilities/sh.html - * - * The first link describes the following shell builtins: - * - * break colon continue dot eval exec exit export readonly return set shift - * times trap unset - * - * The second link (the utilities directory) also contains specs for the - * following shell builtins: - * - * alias bg cd command fc fg getopts hash jobs kill read type ulimit - * umask unalias wait - * - * Things like the bash man page are good to read too. - * - * TODO: // Handle embedded NUL bytes in the command line. - -USE_SH(NEWTOY(cd, NULL, TOYFLAG_NOFORK)) -USE_SH(NEWTOY(exit, NULL, TOYFLAG_NOFORK)) - -USE_SH(NEWTOY(sh, "c:i", TOYFLAG_BIN)) -USE_SH(OLDTOY(toysh, sh, "c:i", TOYFLAG_BIN)) - -config SH - bool "sh (toysh)" - default n - help - usage: sh [-c command] [script] - - Command shell. Runs a shell script, or reads input interactively - and responds to it. - - -c command line to execute - -config SH_TTY - bool "Interactive shell (terminal control)" - default n - depends on SH - help - Add terminal control to toysh. This is necessary for interactive use, - so the shell isn't killed by CTRL-C. - -config SH_PROFILE - bool "Profile support" - default n - depends on SH_TTY - help - Read /etc/profile and ~/.profile when running interactively. - - Also enables the built-in command "source". - -config SH_JOBCTL - bool "Job Control (fg, bg, jobs)" - default n - depends on SH_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 SH_FLOWCTL - bool "Flow control (if, while, for, functions)" - default n - depends on SH - 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 SH_QUOTES - bool "Smarter argument parsing (quotes)" - default n - depends on SH - help - Add support for parsing "" and '' style quotes to the toysh command - parser, with lets arguments have spaces in them. - -config SH_WILDCARDS - bool "Wildcards ( ?*{,} )" - default n - depends on SH_QUOTES - help - Expand wildcards in argument names, ala "ls -l *.t?z" and - "rm subdir/{one,two,three}.txt". - -config SH_PROCARGS - bool "Executable arguments ( `` and $() )" - default n - depends on SH_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 SH_ENVVARS - bool "Environment variable support" - default n - depends on SH_QUOTES - help - Substitute environment variable values for $VARNAME or ${VARNAME}, - and enable the built-in command "export". - -config SH_LOCALS - bool "Local variables" - default n - depends on SH_ENVVARS - help - Support for local variables, fancy prompts ($PS1), the "set" command, - and $?. - -config SH_ARRAYS - bool "Array variables" - default n - depends on SH_LOCALS - help - Support for ${blah[blah]} style array variables. - -config SH_PIPES - bool "Pipes and redirects ( | > >> < << & && | || () ; )" - default n - depends on SH - 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 SH_BUILTINS - bool "Builtin commands" - default n - depends on SH - help - Adds the commands exec, fg, bg, help, jobs, pwd, export, source, set, - unset, read, alias. - -config EXIT - bool - default n - depends on SH - 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 SH - 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 SH - help - usage: cd [-PL] - - -P Physical path: resolve symlinks in path. - -L Cancel previous -P and restore default behavior. -*/ - -#define FOR_sh -#include "toys.h" - -GLOBALS( - char *command; -) - -// A single executable, its arguments, and other information we know about it. -#define SH_FLAG_EXIT 1 -#define SH_FLAG_SUSPEND 2 -#define SH_FLAG_PIPE 4 -#define SH_FLAG_AND 8 -#define SH_FLAG_OR 16 -#define SH_FLAG_AMP 32 -#define SH_FLAG_SEMI 64 -#define SH_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_SH_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_SH_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_SH_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_SH_PIPES && *start) { - if (*start==';') { - start++; - break; - } - // handle | & < > >> << || && - } - break; - } - start = end; - } - - if (CFG_SH_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; - jmp_buf rebound; - - // This fakes lots of what toybox_main() does. - memcpy(&temp, &toys, sizeof(struct toy_context)); - memset(&toys, 0, sizeof(struct toy_context)); - - if (!setjmp(rebound)) { - toys.rebound = rebound; - toy_init(tl, cmd->argv); - tl->toy_main(); - } - cmd->pid = toys.exitval; - if (toys.optargs != toys.argv+1) 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_SH_FLOWCTL || CFG_SH_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 sh_main(void) -{ - FILE *f; - - // Set up signal handlers and grab control of this tty. - if (CFG_SH_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; -} |