mirror of
https://github.com/sheumann/hush.git
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ash: cleanup part 7
This commit is contained in:
Denis Vlasenko
parent
a6704933dd
commit
4fe15f3d9e
408
shell/ash.c
408
shell/ash.c
@ -932,7 +932,6 @@ static int startlinno; /* line # where last token started */
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static char *commandname; /* currently executing command */
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static struct strlist *cmdenviron; /* environment for builtin command */
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static int exitstatus; /* exit status of last command */
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static int back_exitstatus; /* exit status of backquoted command */
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/* ============ Message printing */
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@ -2398,19 +2397,6 @@ static int casematch(union node *, char *);
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static void expari(int);
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#endif
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/* eval.h */
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struct backcmd { /* result of evalbackcmd */
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int fd; /* file descriptor to read from */
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char *buf; /* buffer */
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int nleft; /* number of chars in buffer */
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struct job *jp; /* job structure for command */
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};
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static void freefunc(struct funcnode *);
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/* parser.h */
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/* control characters in argument strings */
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@ -3160,104 +3146,6 @@ struct builtincmd {
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/* unsigned flags; */
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};
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#define COMMANDCMD (builtincmd + 5 + \
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2 * ENABLE_ASH_BUILTIN_TEST + \
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ENABLE_ASH_ALIAS + \
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ENABLE_ASH_JOB_CONTROL)
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#define EXECCMD (builtincmd + 7 + \
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2 * ENABLE_ASH_BUILTIN_TEST + \
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ENABLE_ASH_ALIAS + \
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ENABLE_ASH_JOB_CONTROL + \
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ENABLE_ASH_CMDCMD + \
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ENABLE_ASH_BUILTIN_ECHO)
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#define BUILTIN_NOSPEC "0"
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#define BUILTIN_SPECIAL "1"
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#define BUILTIN_REGULAR "2"
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#define BUILTIN_SPEC_REG "3"
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#define BUILTIN_ASSIGN "4"
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#define BUILTIN_SPEC_ASSG "5"
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#define BUILTIN_REG_ASSG "6"
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#define BUILTIN_SPEC_REG_ASSG "7"
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#define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1)
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#define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2)
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#define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4)
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/* make sure to keep these in proper order since it is searched via bsearch() */
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static const struct builtincmd builtincmd[] = {
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{ BUILTIN_SPEC_REG ".", dotcmd },
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{ BUILTIN_SPEC_REG ":", truecmd },
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#if ENABLE_ASH_BUILTIN_TEST
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{ BUILTIN_REGULAR "[", testcmd },
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{ BUILTIN_REGULAR "[[", testcmd },
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#endif
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#if ENABLE_ASH_ALIAS
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{ BUILTIN_REG_ASSG "alias", aliascmd },
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#endif
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#if JOBS
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{ BUILTIN_REGULAR "bg", fg_bgcmd },
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#endif
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{ BUILTIN_SPEC_REG "break", breakcmd },
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{ BUILTIN_REGULAR "cd", cdcmd },
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{ BUILTIN_NOSPEC "chdir", cdcmd },
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#if ENABLE_ASH_CMDCMD
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{ BUILTIN_REGULAR "command", commandcmd },
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#endif
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{ BUILTIN_SPEC_REG "continue", breakcmd },
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#if ENABLE_ASH_BUILTIN_ECHO
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{ BUILTIN_REGULAR "echo", echocmd },
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#endif
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{ BUILTIN_SPEC_REG "eval", evalcmd },
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{ BUILTIN_SPEC_REG "exec", execcmd },
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{ BUILTIN_SPEC_REG "exit", exitcmd },
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{ BUILTIN_SPEC_REG_ASSG "export", exportcmd },
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{ BUILTIN_REGULAR "false", falsecmd },
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#if JOBS
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{ BUILTIN_REGULAR "fg", fg_bgcmd },
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#endif
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#if ENABLE_ASH_GETOPTS
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{ BUILTIN_REGULAR "getopts", getoptscmd },
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#endif
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{ BUILTIN_NOSPEC "hash", hashcmd },
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#if !ENABLE_FEATURE_SH_EXTRA_QUIET
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{ BUILTIN_NOSPEC "help", helpcmd },
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#endif
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#if JOBS
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{ BUILTIN_REGULAR "jobs", jobscmd },
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{ BUILTIN_REGULAR "kill", killcmd },
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#endif
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#if ENABLE_ASH_MATH_SUPPORT
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{ BUILTIN_NOSPEC "let", letcmd },
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#endif
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{ BUILTIN_ASSIGN "local", localcmd },
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{ BUILTIN_NOSPEC "pwd", pwdcmd },
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{ BUILTIN_REGULAR "read", readcmd },
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{ BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
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{ BUILTIN_SPEC_REG "return", returncmd },
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{ BUILTIN_SPEC_REG "set", setcmd },
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{ BUILTIN_SPEC_REG "shift", shiftcmd },
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{ BUILTIN_SPEC_REG "source", dotcmd },
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#if ENABLE_ASH_BUILTIN_TEST
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{ BUILTIN_REGULAR "test", testcmd },
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#endif
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{ BUILTIN_SPEC_REG "times", timescmd },
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{ BUILTIN_SPEC_REG "trap", trapcmd },
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{ BUILTIN_REGULAR "true", truecmd },
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{ BUILTIN_NOSPEC "type", typecmd },
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{ BUILTIN_NOSPEC "ulimit", ulimitcmd },
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{ BUILTIN_REGULAR "umask", umaskcmd },
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#if ENABLE_ASH_ALIAS
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{ BUILTIN_REGULAR "unalias", unaliascmd },
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#endif
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{ BUILTIN_SPEC_REG "unset", unsetcmd },
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{ BUILTIN_REGULAR "wait", waitcmd },
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};
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#define NUMBUILTINS (sizeof(builtincmd) / sizeof(builtincmd[0]))
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struct cmdentry {
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int cmdtype;
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union param {
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@ -3267,7 +3155,6 @@ struct cmdentry {
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} u;
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};
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/* action to find_command() */
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#define DO_ERR 0x01 /* prints errors */
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#define DO_ABS 0x02 /* checks absolute paths */
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@ -3674,12 +3561,6 @@ static void evalcommand(union node *, int);
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static int evalbltin(const struct builtincmd *, int, char **);
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static int evalfun(struct funcnode *, int, char **, int);
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static void prehash(union node *);
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static int bltincmd(int, char **);
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static const struct builtincmd bltin = {
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"\0\0", bltincmd
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};
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/*
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* Evaluate a parse tree. The value is left in the global variable
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@ -4039,57 +3920,6 @@ evalpipe(union node *n, int flags)
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}
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/*
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* Execute a command inside back quotes. If it's a builtin command, we
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* want to save its output in a block obtained from malloc. Otherwise
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* we fork off a subprocess and get the output of the command via a pipe.
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* Should be called with interrupts off.
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*/
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static void
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evalbackcmd(union node *n, struct backcmd *result)
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{
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int saveherefd;
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result->fd = -1;
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result->buf = NULL;
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result->nleft = 0;
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result->jp = NULL;
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if (n == NULL) {
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goto out;
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}
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saveherefd = herefd;
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herefd = -1;
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{
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int pip[2];
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struct job *jp;
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if (pipe(pip) < 0)
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ash_msg_and_raise_error("Pipe call failed");
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jp = makejob(n, 1);
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if (forkshell(jp, n, FORK_NOJOB) == 0) {
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FORCE_INT_ON;
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close(pip[0]);
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if (pip[1] != 1) {
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close(1);
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copyfd(pip[1], 1);
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close(pip[1]);
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}
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eflag = 0;
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evaltreenr(n, EV_EXIT);
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/* NOTREACHED */
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}
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close(pip[1]);
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result->fd = pip[0];
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result->jp = jp;
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}
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herefd = saveherefd;
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out:
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TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
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result->fd, result->buf, result->nleft, result->jp));
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}
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#if ENABLE_ASH_CMDCMD
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static char **
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parse_command_args(char **argv, const char **path)
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@ -4125,20 +3955,127 @@ parse_command_args(char **argv, const char **path)
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}
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#endif
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static int isassignment(const char *p)
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#define BUILTIN_NOSPEC "0"
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#define BUILTIN_SPECIAL "1"
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#define BUILTIN_REGULAR "2"
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#define BUILTIN_SPEC_REG "3"
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#define BUILTIN_ASSIGN "4"
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#define BUILTIN_SPEC_ASSG "5"
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#define BUILTIN_REG_ASSG "6"
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#define BUILTIN_SPEC_REG_ASSG "7"
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#define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
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#define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
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#define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
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/* make sure to keep these in proper order since it is searched via bsearch() */
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static const struct builtincmd builtintab[] = {
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{ BUILTIN_SPEC_REG ".", dotcmd },
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{ BUILTIN_SPEC_REG ":", truecmd },
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#if ENABLE_ASH_BUILTIN_TEST
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{ BUILTIN_REGULAR "[", testcmd },
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{ BUILTIN_REGULAR "[[", testcmd },
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#endif
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#if ENABLE_ASH_ALIAS
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{ BUILTIN_REG_ASSG "alias", aliascmd },
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#endif
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#if JOBS
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{ BUILTIN_REGULAR "bg", fg_bgcmd },
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#endif
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{ BUILTIN_SPEC_REG "break", breakcmd },
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{ BUILTIN_REGULAR "cd", cdcmd },
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{ BUILTIN_NOSPEC "chdir", cdcmd },
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#if ENABLE_ASH_CMDCMD
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{ BUILTIN_REGULAR "command", commandcmd },
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#endif
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{ BUILTIN_SPEC_REG "continue", breakcmd },
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#if ENABLE_ASH_BUILTIN_ECHO
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{ BUILTIN_REGULAR "echo", echocmd },
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#endif
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{ BUILTIN_SPEC_REG "eval", evalcmd },
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{ BUILTIN_SPEC_REG "exec", execcmd },
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{ BUILTIN_SPEC_REG "exit", exitcmd },
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{ BUILTIN_SPEC_REG_ASSG "export", exportcmd },
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{ BUILTIN_REGULAR "false", falsecmd },
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#if JOBS
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{ BUILTIN_REGULAR "fg", fg_bgcmd },
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#endif
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#if ENABLE_ASH_GETOPTS
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{ BUILTIN_REGULAR "getopts", getoptscmd },
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#endif
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{ BUILTIN_NOSPEC "hash", hashcmd },
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#if !ENABLE_FEATURE_SH_EXTRA_QUIET
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{ BUILTIN_NOSPEC "help", helpcmd },
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#endif
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#if JOBS
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{ BUILTIN_REGULAR "jobs", jobscmd },
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{ BUILTIN_REGULAR "kill", killcmd },
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#endif
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#if ENABLE_ASH_MATH_SUPPORT
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{ BUILTIN_NOSPEC "let", letcmd },
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#endif
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{ BUILTIN_ASSIGN "local", localcmd },
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{ BUILTIN_NOSPEC "pwd", pwdcmd },
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{ BUILTIN_REGULAR "read", readcmd },
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{ BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
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{ BUILTIN_SPEC_REG "return", returncmd },
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{ BUILTIN_SPEC_REG "set", setcmd },
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{ BUILTIN_SPEC_REG "shift", shiftcmd },
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{ BUILTIN_SPEC_REG "source", dotcmd },
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#if ENABLE_ASH_BUILTIN_TEST
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{ BUILTIN_REGULAR "test", testcmd },
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#endif
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{ BUILTIN_SPEC_REG "times", timescmd },
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{ BUILTIN_SPEC_REG "trap", trapcmd },
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{ BUILTIN_REGULAR "true", truecmd },
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{ BUILTIN_NOSPEC "type", typecmd },
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{ BUILTIN_NOSPEC "ulimit", ulimitcmd },
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{ BUILTIN_REGULAR "umask", umaskcmd },
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#if ENABLE_ASH_ALIAS
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{ BUILTIN_REGULAR "unalias", unaliascmd },
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#endif
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{ BUILTIN_SPEC_REG "unset", unsetcmd },
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{ BUILTIN_REGULAR "wait", waitcmd },
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};
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#define NUMBUILTINS (sizeof(builtintab) / sizeof(builtintab[0]))
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#define COMMANDCMD (builtintab + 5 + \
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2 * ENABLE_ASH_BUILTIN_TEST + \
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ENABLE_ASH_ALIAS + \
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ENABLE_ASH_JOB_CONTROL)
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#define EXECCMD (builtintab + 7 + \
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2 * ENABLE_ASH_BUILTIN_TEST + \
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ENABLE_ASH_ALIAS + \
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ENABLE_ASH_JOB_CONTROL + \
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ENABLE_ASH_CMDCMD + \
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ENABLE_ASH_BUILTIN_ECHO)
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/*
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* Execute a simple command.
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*/
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static int back_exitstatus; /* exit status of backquoted command */
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static int
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isassignment(const char *p)
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{
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const char *q = endofname(p);
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if (p == q)
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return 0;
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return *q == '=';
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}
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/*
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* Execute a simple command.
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*/
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static int
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bltincmd(int argc, char **argv)
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{
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/* Preserve exitstatus of a previous possible redirection
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* as POSIX mandates */
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return back_exitstatus;
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}
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static void
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evalcommand(union node *cmd, int flags)
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{
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static const struct builtincmd bltin = {
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"\0\0", bltincmd
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};
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struct stackmark smark;
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union node *argp;
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struct arglist arglist;
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@ -4269,7 +4206,6 @@ evalcommand(union node *cmd, int flags)
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cmd_is_exec++;
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#if ENABLE_ASH_CMDCMD
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if (cmdentry.u.cmd == COMMANDCMD) {
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path = oldpath;
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nargv = parse_command_args(argv, &path);
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if (!nargv)
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@ -4429,6 +4365,16 @@ poplocalvars(void)
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}
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}
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/*
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* Free a parse tree.
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*/
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static void
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freefunc(struct funcnode *f)
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{
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if (f && --f->count < 0)
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free(f);
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}
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static int
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evalfun(struct funcnode *func, int argc, char **argv, int flags)
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{
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@ -4497,26 +4443,11 @@ prehash(union node *n)
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}
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/*
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* Builtin commands. Builtin commands whose functions are closely
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* tied to evaluation are implemented here.
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*/
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/*
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* No command given.
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*/
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static int
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bltincmd(int argc, char **argv)
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{
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/*
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* Preserve exitstatus of a previous possible redirection
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* as POSIX mandates
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*/
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return back_exitstatus;
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}
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/*
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* Handle break and continue commands. Break, continue, and return are
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* all handled by setting the evalskip flag. The evaluation routines
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@ -4544,7 +4475,6 @@ breakcmd(int argc, char **argv)
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return 0;
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}
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/*
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* The return command.
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*/
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@ -4559,21 +4489,18 @@ returncmd(int argc, char **argv)
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return argv[1] ? number(argv[1]) : exitstatus;
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}
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static int
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falsecmd(int argc, char **argv)
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{
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return 1;
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}
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static int
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truecmd(int argc, char **argv)
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{
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return 0;
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}
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static int
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execcmd(int argc, char **argv)
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{
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@ -4984,7 +4911,7 @@ find_builtin(const char *name)
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struct builtincmd *bp;
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bp = bsearch(
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name, builtincmd, NUMBUILTINS, sizeof(struct builtincmd),
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name, builtintab, NUMBUILTINS, sizeof(builtintab[0]),
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pstrcmp
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);
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return bp;
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@ -5154,7 +5081,8 @@ delete_cmd_entry(void)
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* Add a new command entry, replacing any existing command entry for
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* the same name - except special builtins.
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*/
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static void addcmdentry(char *name, struct cmdentry *entry)
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static void
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addcmdentry(char *name, struct cmdentry *entry)
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{
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struct tblentry *cmdp;
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@ -5171,7 +5099,8 @@ static void addcmdentry(char *name, struct cmdentry *entry)
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/*
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* Make a copy of a parse tree.
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*/
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static struct funcnode * copyfunc(union node *n)
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static struct funcnode *
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copyfunc(union node *n)
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{
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struct funcnode *f;
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size_t blocksize;
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@ -5188,7 +5117,6 @@ static struct funcnode * copyfunc(union node *n)
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return f;
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}
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/*
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* Define a shell function.
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*/
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@ -5204,7 +5132,6 @@ defun(char *name, union node *func)
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INT_ON;
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}
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|
||||
/*
|
||||
* 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;
|
||||
@ -5814,6 +5741,64 @@ expari(int quotes)
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
@ -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)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user