2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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35 static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95";
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
46 #define DEFINE_OPTIONS
49 #include "nodes.h" /* for other header files */
61 #include "myhistedit.h"
64 char *arg0; /* value of $0 */
65 struct shparam shellparam; /* current positional parameters */
66 char **argptr; /* argument list for builtin commands */
67 char *shoptarg; /* set by nextopt (like getopt) */
68 char *nextopt_optptr; /* used by nextopt */
70 char *minusc; /* argument to -c option */
73 static void options(int);
74 static void minus_o(char *, int);
75 static void setoption(int, int);
76 static void setoptionbyindex(int, int);
77 static int getopts(char *, char *, char **, char ***, char **);
81 * Process the shell command line arguments.
85 procargs(int argc, char **argv)
93 for (i = 0; i < NOPTS; i++)
95 privileged = (getuid() != geteuid() || getgid() != getegid());
97 if (*argptr == NULL && minusc == NULL)
99 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) {
106 for (i = 0; i < NOPTS; i++)
107 if (optlist[i].val == 2)
110 if (sflag == 0 && minusc == NULL) {
111 scriptname = *argptr++;
112 setinputfile(scriptname, 0);
113 commandname = arg0 = scriptname;
115 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
116 if (argptr && minusc && *argptr)
119 shellparam.p = argptr;
120 shellparam.reset = 1;
121 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
133 setinteractive(iflag);
141 * Process shell options. The global variable argptr contains a pointer
142 * to the argument list; we advance it past the options.
154 while ((p = *argptr) != NULL) {
156 if ((c = *p++) == '-') {
158 /* A "-" or "--" terminates options */
161 if (p[0] == '-' && p[1] == '\0')
164 * For the benefit of `#!' lines in shell scripts,
165 * treat a string of '-- *#.*' the same as '--'.
166 * This is needed so that a script starting with:
167 * #!/bin/sh -- # -*- perl -*-
168 * will continue to work after a change is made to
169 * kern/imgact_shell.c to NOT token-ize the options
170 * specified on a '#!' line. A bit of a kludge,
171 * but that trick is recommended in documentation
172 * for some scripting languages, and we might as
173 * well continue to support it.
177 while (*kp == ' ' || *kp == '\t')
179 if (*kp == '#' || *kp == '\0')
182 } else if (c == '+') {
188 while ((c = *p++) != '\0') {
189 if (c == 'c' && cmdline) {
191 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
195 if (q == NULL || minusc != NULL)
196 error("Bad -c option");
201 } else if (c == 'o') {
202 minus_o(*argptr, val);
211 /* When processing `set', a single "-" means turn off -x and -v */
219 * When processing `set', a "--" means the remaining arguments
220 * replace the positional parameters in the active shell. If
221 * there are no remaining options, then all the positional
222 * parameters are cleared (equivalent to doing ``shift $#'').
232 * At this point we are processing options given to 'sh' on a command
233 * line. If an end-of-options marker ("-" or "--") is followed by an
234 * arg of "#", then skip over all remaining arguments. Some scripting
235 * languages (e.g.: perl) document that /bin/sh will implement this
236 * behavior, and they recommend that users take advantage of it to
237 * solve certain issues that can come up when writing a perl script.
238 * Yes, this feature is in /bin/sh to help users write perl scripts.
241 if (p != NULL && p[0] == '#' && p[1] == '\0') {
242 while (*argptr != NULL)
244 /* We need to keep the final argument */
250 minus_o(char *name, int val)
256 /* "Pretty" output. */
257 out1str("Current option settings\n");
258 for (i = 0; i < NOPTS; i++)
259 out1fmt("%-16s%s\n", optlist[i].name,
260 optlist[i].val ? "on" : "off");
262 /* Output suitable for re-input to shell. */
263 for (i = 0; i < NOPTS; i++)
264 out1fmt("%s %co %s%s",
265 i % 6 == 0 ? "set" : "",
266 optlist[i].val ? '-' : '+',
268 i % 6 == 5 || i == NOPTS - 1 ? "\n" : "");
271 for (i = 0; i < NOPTS; i++)
272 if (equal(name, optlist[i].name)) {
273 setoptionbyindex(i, val);
276 error("Illegal option -o %s", name);
282 setoptionbyindex(int idx, int val)
284 if (optlist[idx].letter == 'p' && !val && privileged) {
285 if (setgid(getgid()) == -1)
287 if (setuid(getuid()) == -1)
290 optlist[idx].val = val;
292 /* #%$ hack for ksh semantics */
293 if (optlist[idx].letter == 'V')
295 else if (optlist[idx].letter == 'E')
301 setoption(int flag, int val)
305 for (i = 0; i < NOPTS; i++)
306 if (optlist[i].letter == flag) {
307 setoptionbyindex(i, val);
310 error("Illegal option -%c", flag);
315 * Set the shell parameters.
319 setparam(char **argv)
325 for (nparam = 0 ; argv[nparam] ; nparam++);
326 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
328 *ap++ = savestr(*argv++);
331 freeparam(&shellparam);
332 shellparam.malloc = 1;
333 shellparam.nparam = nparam;
334 shellparam.p = newparam;
335 shellparam.optp = NULL;
336 shellparam.reset = 1;
337 shellparam.optnext = NULL;
342 * Free the list of positional parameters.
346 freeparam(struct shparam *param)
351 for (ap = param->p ; *ap ; ap++)
356 for (ap = param->optp ; *ap ; ap++)
365 * The shift builtin command.
369 shiftcmd(int argc, char **argv)
377 if (n > shellparam.nparam)
380 shellparam.nparam -= n;
381 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
382 if (shellparam.malloc)
386 while ((*ap2++ = *ap1++) != NULL);
387 shellparam.reset = 1;
395 * The set command builtin.
399 setcmd(int argc, char **argv)
402 return showvarscmd(argc, argv);
406 if (*argptr != NULL) {
415 getoptsreset(const char *value)
417 while (*value == '0')
419 if (strcmp(value, "1") == 0)
420 shellparam.reset = 1;
424 * The getopts builtin. Shellparam.optnext points to the next argument
425 * to be processed. Shellparam.optptr points to the next character to
426 * be processed in the current argument. If shellparam.optnext is NULL,
427 * then it's the first time getopts has been called.
431 getoptscmd(int argc, char **argv)
433 char **optbase = NULL, **ap;
437 error("usage: getopts optstring var [arg]");
439 if (shellparam.reset == 1) {
441 if (shellparam.optp) {
442 for (ap = shellparam.optp ; *ap ; ap++)
444 ckfree(shellparam.optp);
445 shellparam.optp = NULL;
448 shellparam.optp = ckmalloc((argc - 2) * sizeof *ap);
449 memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap);
450 for (i = 0; i < argc - 3; i++)
451 shellparam.optp[i] = savestr(argv[i + 3]);
454 optbase = argc == 3 ? shellparam.p : shellparam.optp;
455 shellparam.optnext = optbase;
456 shellparam.optptr = NULL;
457 shellparam.reset = 0;
459 optbase = shellparam.optp ? shellparam.optp : shellparam.p;
461 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
466 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
475 const char *newoptarg = NULL;
477 if ((p = *optptr) == NULL || *p == '\0') {
478 /* Current word is done, advance */
479 if (*optnext == NULL)
482 if (p == NULL || *p != '-' || *++p == '\0') {
484 ind = *optnext - optfirst + 1;
491 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
496 for (q = optstr; *q != c; ) {
498 if (optstr[0] == ':') {
504 out2fmt_flush("Illegal option -%c\n", c);
513 if (*p == '\0' && (p = **optnext) == NULL) {
514 if (optstr[0] == ':') {
521 out2fmt_flush("No arg for -%c option\n", c);
534 if (*optnext != NULL)
535 ind = *optnext - optfirst + 1;
537 if (newoptarg != NULL)
538 err |= setvarsafe("OPTARG", newoptarg, 0);
541 err |= unsetvar("OPTARG");
544 fmtstr(s, sizeof(s), "%d", ind);
545 err |= setvarsafe("OPTIND", s, VNOFUNC);
548 err |= setvarsafe(optvar, s, 0);
559 * Standard option processing (a la getopt) for builtin routines. The
560 * only argument that is passed to nextopt is the option string; the
561 * other arguments are unnecessary. It return the character, or '\0' on
566 nextopt(const char *optstring)
572 if ((p = nextopt_optptr) == NULL || *p == '\0') {
574 if (p == NULL || *p != '-' || *++p == '\0')
577 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
581 for (q = optstring ; *q != c ; ) {
583 error("Illegal option -%c", c);
588 if (*p == '\0' && (p = *argptr++) == NULL)
589 error("No arg for -%c option", c);