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36 * @(#)options.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/options.c,v 1.25 2006/04/09 12:20:42 stefanf Exp $
38 * $DragonFly: src/bin/sh/options.c,v 1.7 2007/01/14 04:41:32 pavalos Exp $
46 #define DEFINE_OPTIONS
49 #include "nodes.h" /* for other header files */
60 #include "myhistedit.h"
63 char *arg0; /* value of $0 */
64 struct shparam shellparam; /* current positional parameters */
65 char **argptr; /* argument list for builtin commands */
66 const char *shoptarg; /* set by nextopt (like getopt) */
67 const char *optptr; /* used by nextopt */
69 char *minusc; /* argument to -c option */
72 STATIC void options(int);
73 STATIC void minus_o(char *, int);
74 STATIC void setoption(int, int);
75 STATIC int getopts(char *, char *, char **, char ***, char **);
79 * Process the shell command line arguments.
83 procargs(int argc, char **argv)
90 for (i = 0; i < NOPTS; i++)
92 privileged = (getuid() != geteuid() || getgid() != getegid());
94 if (*argptr == NULL && minusc == NULL)
96 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
100 /* turn on tabcomplete in an interactive shell by default */
102 for (i = 0; i < NOPTS; i++)
103 if (optlist[i].val == 2)
106 if (sflag == 0 && minusc == NULL) {
107 commandname = arg0 = *argptr++;
108 setinputfile(commandname, 0);
110 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
111 if (argptr && minusc && *argptr)
114 shellparam.p = argptr;
115 shellparam.reset = 1;
116 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
128 setinteractive(iflag);
136 * Process shell options. The global variable argptr contains a pointer
137 * to the argument list; we advance it past the options.
149 while ((p = *argptr) != NULL) {
151 if ((c = *p++) == '-') {
153 /* A "-" or "--" terminates options */
156 if (p[0] == '-' && p[1] == '\0')
159 * For the benefit of `#!' lines in shell scripts,
160 * treat a string of '-- *#.*' the same as '--'.
161 * This is needed so that a script starting with:
162 * #!/bin/sh -- # -*- perl -*-
163 * will continue to work after a change is made to
164 * kern/imgact_shell.c to NOT token-ize the options
165 * specified on a '#!' line. A bit of a kludge,
166 * but that trick is recommended in documentation
167 * for some scripting languages, and we might as
168 * well continue to support it.
172 while (*kp == ' ' || *kp == '\t')
174 if (*kp == '#' || *kp == '\0')
177 } else if (c == '+') {
183 while ((c = *p++) != '\0') {
184 if (c == 'c' && cmdline) {
186 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
190 if (q == NULL || minusc != NULL)
191 error("Bad -c option");
196 } else if (c == 'o') {
197 minus_o(*argptr, val);
201 if (c == 'p' && !val && privileged) {
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 $#'').
232 * At this point we are processing options given to 'sh' on a command
233 * line. If an end-of-options marker ("-" or "--") is followed by an
234 * arg of "#", then skip over all remaining arguments. Some scripting
235 * languages (e.g.: perl) document that /bin/sh will implement this
236 * behavior, and they recommend that users take advantage of it to
237 * solve certain issues that can come up when writing a perl script.
238 * Yes, this feature is in /bin/sh to help users write perl scripts.
241 if (p != NULL && p[0] == '#' && p[1] == '\0') {
242 while (*argptr != NULL)
244 /* We need to keep the final argument */
250 minus_o(char *name, int val)
256 /* "Pretty" output. */
257 out1str("Current option settings\n");
258 for (i = 0; i < NOPTS; i++)
259 out1fmt("%-16s%s\n", optlist[i].name,
260 optlist[i].val ? "on" : "off");
262 /* Output suitable for re-input to shell. */
263 for (i = 0; i < NOPTS; i++) {
265 out1str(i == 0 ? "set" : "\nset");
266 out1fmt(" %co %s", optlist[i].val ? '-' : '+',
272 for (i = 0; i < NOPTS; i++)
273 if (equal(name, optlist[i].name)) {
274 if (!val && privileged && equal(name, "privileged")) {
278 setoption(optlist[i].letter, val);
281 error("Illegal option -o %s", name);
287 setoption(int flag, int val)
291 for (i = 0; i < NOPTS; i++)
292 if (optlist[i].letter == flag) {
293 optlist[i].val = val;
295 /* #%$ hack for ksh semantics */
298 else if (flag == 'E')
303 error("Illegal option -%c", flag);
314 for (i = 0; i < NOPTS; i++)
323 * Set the shell parameters.
327 setparam(char **argv)
333 for (nparam = 0 ; argv[nparam] ; nparam++);
334 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
336 *ap++ = savestr(*argv++);
339 freeparam(&shellparam);
340 shellparam.malloc = 1;
341 shellparam.nparam = nparam;
342 shellparam.p = newparam;
343 shellparam.optnext = NULL;
348 * Free the list of positional parameters.
352 freeparam(volatile struct shparam *param)
357 for (ap = param->p ; *ap ; ap++)
366 * The shift builtin command.
370 shiftcmd(int argc, char **argv)
378 if (n > shellparam.nparam)
381 shellparam.nparam -= n;
382 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
383 if (shellparam.malloc)
387 while ((*ap2++ = *ap1++) != NULL);
388 shellparam.optnext = NULL;
396 * The set command builtin.
400 setcmd(int argc, char **argv)
403 return showvarscmd(argc, argv);
407 if (*argptr != NULL) {
416 getoptsreset(const char *value)
418 if (number(value) == 1) {
419 shellparam.optnext = NULL;
420 shellparam.reset = 1;
425 * The getopts builtin. Shellparam.optnext points to the next argument
426 * to be processed. Shellparam.optptr points to the next character to
427 * be processed in the current argument. If shellparam.optnext is NULL,
428 * then it's the first time getopts has been called.
432 getoptscmd(int argc, char **argv)
434 char **optbase = NULL;
437 error("usage: getopts optstring var [arg]");
439 optbase = shellparam.p;
443 if (shellparam.reset == 1) {
444 shellparam.optnext = optbase;
445 shellparam.optptr = NULL;
446 shellparam.reset = 0;
449 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
454 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
464 if ((p = *optp) == NULL || *p == '\0') {
465 /* Current word is done, advance */
466 if (*optnext == NULL)
469 if (p == NULL || *p != '-' || *++p == '\0') {
471 ind = *optnext - optfirst + 1;
478 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
483 for (q = optstr; *q != c; ) {
485 if (optstr[0] == ':') {
488 err |= setvarsafe("OPTARG", s, 0);
491 out1fmt("Illegal option -%c\n", c);
502 if (*p == '\0' && (p = **optnext) == NULL) {
503 if (optstr[0] == ':') {
506 err |= setvarsafe("OPTARG", s, 0);
510 out1fmt("No arg for -%c option\n", c);
519 setvarsafe("OPTARG", p, 0);
523 setvarsafe("OPTARG", "", 0);
524 ind = *optnext - optfirst + 1;
533 fmtstr(s, sizeof(s), "%d", ind);
534 err |= setvarsafe("OPTIND", s, VNOFUNC);
537 err |= setvarsafe(optvar, s, 0);
548 * XXX - should get rid of. have all builtins use getopt(3). the
549 * library getopt must have the BSD extension static variable "optreset"
550 * otherwise it can't be used within the shell safely.
552 * Standard option processing (a la getopt) for builtin routines. The
553 * only argument that is passed to nextopt is the option string; the
554 * other arguments are unnecessary. It return the character, or '\0' on
559 nextopt(const char *optstring)
564 if ((p = optptr) == NULL || *p == '\0') {
566 if (p == NULL || *p != '-' || *++p == '\0')
569 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
573 for (q = optstring ; *q != c ; ) {
575 error("Illegal option -%c", c);
580 if (*p == '\0' && (p = *argptr++) == NULL)
581 error("No arg for -%c option", c);