diff options
| -rw-r--r-- | shell/ash.c | 408 |
1 files changed, 191 insertions, 217 deletions
diff --git a/shell/ash.c b/shell/ash.c index 69b8ab0..e061211 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -932,7 +932,6 @@ static int startlinno; /* line # where last token started */ static char *commandname; /* currently executing command */ static struct strlist *cmdenviron; /* environment for builtin command */ static int exitstatus; /* exit status of last command */ -static int back_exitstatus; /* exit status of backquoted command */ /* ============ Message printing */ @@ -2398,19 +2397,6 @@ static int casematch(union node *, char *); static void expari(int); #endif -/* eval.h */ - - - -struct backcmd { /* result of evalbackcmd */ - int fd; /* file descriptor to read from */ - char *buf; /* buffer */ - int nleft; /* number of chars in buffer */ - struct job *jp; /* job structure for command */ -}; - - -static void freefunc(struct funcnode *); /* parser.h */ /* control characters in argument strings */ @@ -3160,104 +3146,6 @@ struct builtincmd { /* unsigned flags; */ }; - -#define COMMANDCMD (builtincmd + 5 + \ - 2 * ENABLE_ASH_BUILTIN_TEST + \ - ENABLE_ASH_ALIAS + \ - ENABLE_ASH_JOB_CONTROL) -#define EXECCMD (builtincmd + 7 + \ - 2 * ENABLE_ASH_BUILTIN_TEST + \ - ENABLE_ASH_ALIAS + \ - ENABLE_ASH_JOB_CONTROL + \ - ENABLE_ASH_CMDCMD + \ - ENABLE_ASH_BUILTIN_ECHO) - -#define BUILTIN_NOSPEC "0" -#define BUILTIN_SPECIAL "1" -#define BUILTIN_REGULAR "2" -#define BUILTIN_SPEC_REG "3" -#define BUILTIN_ASSIGN "4" -#define BUILTIN_SPEC_ASSG "5" -#define BUILTIN_REG_ASSG "6" -#define BUILTIN_SPEC_REG_ASSG "7" - -#define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1) -#define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2) -#define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4) - -/* make sure to keep these in proper order since it is searched via bsearch() */ -static const struct builtincmd builtincmd[] = { - { BUILTIN_SPEC_REG ".", dotcmd }, - { BUILTIN_SPEC_REG ":", truecmd }, -#if ENABLE_ASH_BUILTIN_TEST - { BUILTIN_REGULAR "[", testcmd }, - { BUILTIN_REGULAR "[[", testcmd }, -#endif -#if ENABLE_ASH_ALIAS - { BUILTIN_REG_ASSG "alias", aliascmd }, -#endif -#if JOBS - { BUILTIN_REGULAR "bg", fg_bgcmd }, -#endif - { BUILTIN_SPEC_REG "break", breakcmd }, - { BUILTIN_REGULAR "cd", cdcmd }, - { BUILTIN_NOSPEC "chdir", cdcmd }, -#if ENABLE_ASH_CMDCMD - { BUILTIN_REGULAR "command", commandcmd }, -#endif - { BUILTIN_SPEC_REG "continue", breakcmd }, -#if ENABLE_ASH_BUILTIN_ECHO - { BUILTIN_REGULAR "echo", echocmd }, -#endif - { BUILTIN_SPEC_REG "eval", evalcmd }, - { BUILTIN_SPEC_REG "exec", execcmd }, - { BUILTIN_SPEC_REG "exit", exitcmd }, - { BUILTIN_SPEC_REG_ASSG "export", exportcmd }, - { BUILTIN_REGULAR "false", falsecmd }, -#if JOBS - { BUILTIN_REGULAR "fg", fg_bgcmd }, -#endif -#if ENABLE_ASH_GETOPTS - { BUILTIN_REGULAR "getopts", getoptscmd }, -#endif - { BUILTIN_NOSPEC "hash", hashcmd }, -#if !ENABLE_FEATURE_SH_EXTRA_QUIET - { BUILTIN_NOSPEC "help", helpcmd }, -#endif -#if JOBS - { BUILTIN_REGULAR "jobs", jobscmd }, - { BUILTIN_REGULAR "kill", killcmd }, -#endif -#if ENABLE_ASH_MATH_SUPPORT - { BUILTIN_NOSPEC "let", letcmd }, -#endif - { BUILTIN_ASSIGN "local", localcmd }, - { BUILTIN_NOSPEC "pwd", pwdcmd }, - { BUILTIN_REGULAR "read", readcmd }, - { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd }, - { BUILTIN_SPEC_REG "return", returncmd }, - { BUILTIN_SPEC_REG "set", setcmd }, - { BUILTIN_SPEC_REG "shift", shiftcmd }, - { BUILTIN_SPEC_REG "source", dotcmd }, -#if ENABLE_ASH_BUILTIN_TEST - { BUILTIN_REGULAR "test", testcmd }, -#endif - { BUILTIN_SPEC_REG "times", timescmd }, - { BUILTIN_SPEC_REG "trap", trapcmd }, - { BUILTIN_REGULAR "true", truecmd }, - { BUILTIN_NOSPEC "type", typecmd }, - { BUILTIN_NOSPEC "ulimit", ulimitcmd }, - { BUILTIN_REGULAR "umask", umaskcmd }, -#if ENABLE_ASH_ALIAS - { BUILTIN_REGULAR "unalias", unaliascmd }, -#endif - { BUILTIN_SPEC_REG "unset", unsetcmd }, - { BUILTIN_REGULAR "wait", waitcmd }, -}; - -#define NUMBUILTINS (sizeof(builtincmd) / sizeof(builtincmd[0])) - - struct cmdentry { int cmdtype; union param { @@ -3267,7 +3155,6 @@ struct cmdentry { } u; }; - /* action to find_command() */ #define DO_ERR 0x01 /* prints errors */ #define DO_ABS 0x02 /* checks absolute paths */ @@ -3674,12 +3561,6 @@ static void evalcommand(union node *, int); static int evalbltin(const struct builtincmd *, int, char **); static int evalfun(struct funcnode *, int, char **, int); static void prehash(union node *); -static int bltincmd(int, char **); - -static const struct builtincmd bltin = { - "\0\0", bltincmd -}; - /* * Evaluate a parse tree. The value is left in the global variable @@ -4039,57 +3920,6 @@ evalpipe(union node *n, int flags) } -/* - * Execute a command inside back quotes. If it's a builtin command, we - * want to save its output in a block obtained from malloc. Otherwise - * we fork off a subprocess and get the output of the command via a pipe. - * Should be called with interrupts off. - */ -static void -evalbackcmd(union node *n, struct backcmd *result) -{ - int saveherefd; - - result->fd = -1; - result->buf = NULL; - result->nleft = 0; - result->jp = NULL; - if (n == NULL) { - goto out; - } - - saveherefd = herefd; - herefd = -1; - - { - int pip[2]; - struct job *jp; - - if (pipe(pip) < 0) - ash_msg_and_raise_error("Pipe call failed"); - jp = makejob(n, 1); - if (forkshell(jp, n, FORK_NOJOB) == 0) { - FORCE_INT_ON; - close(pip[0]); - if (pip[1] != 1) { - close(1); - copyfd(pip[1], 1); - close(pip[1]); - } - eflag = 0; - evaltreenr(n, EV_EXIT); - /* NOTREACHED */ - } - close(pip[1]); - result->fd = pip[0]; - result->jp = jp; - } - herefd = saveherefd; - out: - TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n", - result->fd, result->buf, result->nleft, result->jp)); -} - #if ENABLE_ASH_CMDCMD static char ** parse_command_args(char **argv, const char **path) @@ -4125,20 +3955,127 @@ parse_command_args(char **argv, const char **path) } #endif -static int isassignment(const char *p) +#define BUILTIN_NOSPEC "0" +#define BUILTIN_SPECIAL "1" +#define BUILTIN_REGULAR "2" +#define BUILTIN_SPEC_REG "3" +#define BUILTIN_ASSIGN "4" +#define BUILTIN_SPEC_ASSG "5" +#define BUILTIN_REG_ASSG "6" +#define BUILTIN_SPEC_REG_ASSG "7" + +#define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1) +#define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2) +#define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4) + +/* make sure to keep these in proper order since it is searched via bsearch() */ +static const struct builtincmd builtintab[] = { + { BUILTIN_SPEC_REG ".", dotcmd }, + { BUILTIN_SPEC_REG ":", truecmd }, +#if ENABLE_ASH_BUILTIN_TEST + { BUILTIN_REGULAR "[", testcmd }, + { BUILTIN_REGULAR "[[", testcmd }, +#endif +#if ENABLE_ASH_ALIAS + { BUILTIN_REG_ASSG "alias", aliascmd }, +#endif +#if JOBS + { BUILTIN_REGULAR "bg", fg_bgcmd }, +#endif + { BUILTIN_SPEC_REG "break", breakcmd }, + { BUILTIN_REGULAR "cd", cdcmd }, + { BUILTIN_NOSPEC "chdir", cdcmd }, +#if ENABLE_ASH_CMDCMD + { BUILTIN_REGULAR "command", commandcmd }, +#endif + { BUILTIN_SPEC_REG "continue", breakcmd }, +#if ENABLE_ASH_BUILTIN_ECHO + { BUILTIN_REGULAR "echo", echocmd }, +#endif + { BUILTIN_SPEC_REG "eval", evalcmd }, + { BUILTIN_SPEC_REG "exec", execcmd }, + { BUILTIN_SPEC_REG "exit", exitcmd }, + { BUILTIN_SPEC_REG_ASSG "export", exportcmd }, + { BUILTIN_REGULAR "false", falsecmd }, +#if JOBS + { BUILTIN_REGULAR "fg", fg_bgcmd }, +#endif +#if ENABLE_ASH_GETOPTS + { BUILTIN_REGULAR "getopts", getoptscmd }, +#endif + { BUILTIN_NOSPEC "hash", hashcmd }, +#if !ENABLE_FEATURE_SH_EXTRA_QUIET + { BUILTIN_NOSPEC "help", helpcmd }, +#endif +#if JOBS + { BUILTIN_REGULAR "jobs", jobscmd }, + { BUILTIN_REGULAR "kill", killcmd }, +#endif +#if ENABLE_ASH_MATH_SUPPORT + { BUILTIN_NOSPEC "let", letcmd }, +#endif + { BUILTIN_ASSIGN "local", localcmd }, + { BUILTIN_NOSPEC "pwd", pwdcmd }, + { BUILTIN_REGULAR "read", readcmd }, + { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd }, + { BUILTIN_SPEC_REG "return", returncmd }, + { BUILTIN_SPEC_REG "set", setcmd }, + { BUILTIN_SPEC_REG "shift", shiftcmd }, + { BUILTIN_SPEC_REG "source", dotcmd }, +#if ENABLE_ASH_BUILTIN_TEST + { BUILTIN_REGULAR "test", testcmd }, +#endif + { BUILTIN_SPEC_REG "times", timescmd }, + { BUILTIN_SPEC_REG "trap", trapcmd }, + { BUILTIN_REGULAR "true", truecmd }, + { BUILTIN_NOSPEC "type", typecmd }, + { BUILTIN_NOSPEC "ulimit", ulimitcmd }, + { BUILTIN_REGULAR "umask", umaskcmd }, +#if ENABLE_ASH_ALIAS + { BUILTIN_REGULAR "unalias", unaliascmd }, +#endif + { BUILTIN_SPEC_REG "unset", unsetcmd }, + { BUILTIN_REGULAR "wait", waitcmd }, +}; + +#define NUMBUILTINS (sizeof(builtintab) / sizeof(builtintab[0])) + +#define COMMANDCMD (builtintab + 5 + \ + 2 * ENABLE_ASH_BUILTIN_TEST + \ + ENABLE_ASH_ALIAS + \ + ENABLE_ASH_JOB_CONTROL) +#define EXECCMD (builtintab + 7 + \ + 2 * ENABLE_ASH_BUILTIN_TEST + \ + ENABLE_ASH_ALIAS + \ + ENABLE_ASH_JOB_CONTROL + \ + ENABLE_ASH_CMDCMD + \ + ENABLE_ASH_BUILTIN_ECHO) + +/* + * Execute a simple command. + */ +static int back_exitstatus; /* exit status of backquoted command */ +static int +isassignment(const char *p) { const char *q = endofname(p); if (p == q) return 0; return *q == '='; } - -/* - * Execute a simple command. - */ +static int +bltincmd(int argc, char **argv) +{ + /* Preserve exitstatus of a previous possible redirection + * as POSIX mandates */ + return back_exitstatus; +} static void evalcommand(union node *cmd, int flags) { + static const struct builtincmd bltin = { + "\0\0", bltincmd + }; struct stackmark smark; union node *argp; struct arglist arglist; @@ -4269,7 +4206,6 @@ evalcommand(union node *cmd, int flags) cmd_is_exec++; #if ENABLE_ASH_CMDCMD if (cmdentry.u.cmd == COMMANDCMD) { - path = oldpath; nargv = parse_command_args(argv, &path); if (!nargv) @@ -4429,6 +4365,16 @@ poplocalvars(void) } } +/* + * Free a parse tree. + */ +static void +freefunc(struct funcnode *f) +{ + if (f && --f->count < 0) + free(f); +} + static int evalfun(struct funcnode *func, int argc, char **argv, int flags) { @@ -4497,27 +4443,12 @@ prehash(union node *n) } - /* * Builtin commands. Builtin commands whose functions are closely * tied to evaluation are implemented here. */ /* - * No command given. - */ -static int -bltincmd(int argc, char **argv) -{ - /* - * Preserve exitstatus of a previous possible redirection - * as POSIX mandates - */ - return back_exitstatus; -} - - -/* * Handle break and continue commands. Break, continue, and return are * all handled by setting the evalskip flag. The evaluation routines * above all check this flag, and if it is set they start skipping @@ -4544,7 +4475,6 @@ breakcmd(int argc, char **argv) return 0; } - /* * The return command. */ @@ -4559,21 +4489,18 @@ returncmd(int argc, char **argv) return argv[1] ? number(argv[1]) : exitstatus; } - static int falsecmd(int argc, char **argv) { return 1; } - static int truecmd(int argc, char **argv) { return 0; } - static int execcmd(int argc, char **argv) { @@ -4984,7 +4911,7 @@ find_builtin(const char *name) struct builtincmd *bp; bp = bsearch( - name, builtincmd, NUMBUILTINS, sizeof(struct builtincmd), + name, builtintab, NUMBUILTINS, sizeof(builtintab[0]), pstrcmp ); return bp; @@ -5154,7 +5081,8 @@ delete_cmd_entry(void) * Add a new command entry, replacing any existing command entry for * the same name - except special builtins. */ -static void addcmdentry(char *name, struct cmdentry *entry) +static void +addcmdentry(char *name, struct cmdentry *entry) { struct tblentry *cmdp; @@ -5171,7 +5099,8 @@ static void addcmdentry(char *name, struct cmdentry *entry) /* * Make a copy of a parse tree. */ -static struct funcnode * copyfunc(union node *n) +static struct funcnode * +copyfunc(union node *n) { struct funcnode *f; size_t blocksize; @@ -5188,7 +5117,6 @@ static struct funcnode * copyfunc(union node *n) return f; } - /* * Define a shell function. */ @@ -5204,7 +5132,6 @@ defun(char *name, union node *func) INT_ON; } - /* * Delete a function if it exists. */ @@ -5432,8 +5359,8 @@ static void varunset(const char *, const char *, const char *, int) ATTRIBUTE_NO * * Returns an stalloced string. */ - -static char * preglob(const char *pattern, int quoted, int flag) +static char * +preglob(const char *pattern, int quoted, int flag) { flag |= RMESCAPE_GLOB; if (quoted) { @@ -5458,8 +5385,8 @@ esclen(const char *start, const char *p) /* * Expand shell variables and backquotes inside a here document. */ - -static void expandhere(union node *arg, int fd) +static void +expandhere(union node *arg, int fd) { herefd = fd; expandarg(arg, (struct arglist *)NULL, 0); @@ -5756,7 +5683,7 @@ removerecordregions(int endoff) * Expand arithmetic expression. Backup to start of expression, * evaluate, place result in (backed up) result, adjust string position. */ -void +static void expari(int quotes) { char *p, *start; @@ -5815,6 +5742,64 @@ expari(int quotes) /* + * Execute a command inside back quotes. If it's a builtin command, we + * want to save its output in a block obtained from malloc. Otherwise + * we fork off a subprocess and get the output of the command via a pipe. + * Should be called with interrupts off. + */ +struct backcmd { /* result of evalbackcmd */ + int fd; /* file descriptor to read from */ + char *buf; /* buffer */ + int nleft; /* number of chars in buffer */ + struct job *jp; /* job structure for command */ +}; + +static void +evalbackcmd(union node *n, struct backcmd *result) +{ + int saveherefd; + + result->fd = -1; + result->buf = NULL; + result->nleft = 0; + result->jp = NULL; + if (n == NULL) { + goto out; + } + + saveherefd = herefd; + herefd = -1; + + { + int pip[2]; + struct job *jp; + + if (pipe(pip) < 0) + ash_msg_and_raise_error("Pipe call failed"); + jp = makejob(n, 1); + if (forkshell(jp, n, FORK_NOJOB) == 0) { + FORCE_INT_ON; + close(pip[0]); + if (pip[1] != 1) { + close(1); + copyfd(pip[1], 1); + close(pip[1]); + } + eflag = 0; + evaltreenr(n, EV_EXIT); + /* NOTREACHED */ + } + close(pip[1]); + result->fd = pip[0]; + result->jp = jp; + } + herefd = saveherefd; + out: + TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n", + result->fd, result->buf, result->nleft, result->jp)); +} + +/* * Expand stuff in backwards quotes. */ static void @@ -5834,7 +5819,7 @@ expbackq(union node *cmd, int quoted, int quotes) dest = expdest; startloc = dest - (char *)stackblock(); grabstackstr(dest); - evalbackcmd(cmd, (struct backcmd *) &in); + evalbackcmd(cmd, &in); popstackmark(&smark); p = in.buf; @@ -8918,17 +8903,6 @@ nodeckstrdup(char *s) } -/* - * Free a parse tree. - */ -static void -freefunc(struct funcnode *f) -{ - if (f && --f->count < 0) - free(f); -} - - static void optschanged(void) { |