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 int getopts(char *, char *, char **, char ***, char **);
80 * Process the shell command line arguments.
84 procargs(int argc, char **argv)
92 for (i = 0; i < NOPTS; i++)
94 privileged = (getuid() != geteuid() || getgid() != getegid());
96 if (*argptr == NULL && minusc == NULL)
98 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) {
105 for (i = 0; i < NOPTS; i++)
106 if (optlist[i].val == 2)
109 if (sflag == 0 && minusc == NULL) {
110 scriptname = *argptr++;
111 setinputfile(scriptname, 0);
112 commandname = arg0 = scriptname;
114 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
115 if (argptr && minusc && *argptr)
118 shellparam.p = argptr;
119 shellparam.reset = 1;
120 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
132 setinteractive(iflag);
140 * Process shell options. The global variable argptr contains a pointer
141 * to the argument list; we advance it past the options.
153 while ((p = *argptr) != NULL) {
155 if ((c = *p++) == '-') {
157 /* A "-" or "--" terminates options */
160 if (p[0] == '-' && p[1] == '\0')
163 * For the benefit of `#!' lines in shell scripts,
164 * treat a string of '-- *#.*' the same as '--'.
165 * This is needed so that a script starting with:
166 * #!/bin/sh -- # -*- perl -*-
167 * will continue to work after a change is made to
168 * kern/imgact_shell.c to NOT token-ize the options
169 * specified on a '#!' line. A bit of a kludge,
170 * but that trick is recommended in documentation
171 * for some scripting languages, and we might as
172 * well continue to support it.
176 while (*kp == ' ' || *kp == '\t')
178 if (*kp == '#' || *kp == '\0')
181 } else if (c == '+') {
187 while ((c = *p++) != '\0') {
188 if (c == 'c' && cmdline) {
190 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
194 if (q == NULL || minusc != NULL)
195 error("Bad -c option");
200 } else if (c == 'o') {
201 minus_o(*argptr, val);
210 /* When processing `set', a single "-" means turn off -x and -v */
218 * When processing `set', a "--" means the remaining arguments
219 * replace the positional parameters in the active shell. If
220 * there are no remaining options, then all the positional
221 * parameters are cleared (equivalent to doing ``shift $#'').
231 * At this point we are processing options given to 'sh' on a command
232 * line. If an end-of-options marker ("-" or "--") is followed by an
233 * arg of "#", then skip over all remaining arguments. Some scripting
234 * languages (e.g.: perl) document that /bin/sh will implement this
235 * behavior, and they recommend that users take advantage of it to
236 * solve certain issues that can come up when writing a perl script.
237 * Yes, this feature is in /bin/sh to help users write perl scripts.
240 if (p != NULL && p[0] == '#' && p[1] == '\0') {
241 while (*argptr != NULL)
243 /* We need to keep the final argument */
249 minus_o(char *name, int val)
255 /* "Pretty" output. */
256 out1str("Current option settings\n");
257 for (i = 0; i < NOPTS; i++)
258 out1fmt("%-16s%s\n", optlist[i].name,
259 optlist[i].val ? "on" : "off");
261 /* Output suitable for re-input to shell. */
262 for (i = 0; i < NOPTS; i++)
263 out1fmt("%s %co %s%s",
264 i % 6 == 0 ? "set" : "",
265 optlist[i].val ? '-' : '+',
267 i % 6 == 5 || i == NOPTS - 1 ? "\n" : "");
270 for (i = 0; i < NOPTS; i++)
271 if (equal(name, optlist[i].name)) {
272 setoption(optlist[i].letter, val);
275 error("Illegal option -o %s", name);
281 setoption(int flag, int val)
285 if (flag == 'p' && !val && privileged) {
286 if (setgid(getgid()) == -1)
288 if (setuid(getuid()) == -1)
291 for (i = 0; i < NOPTS; i++)
292 if (optlist[i].letter == flag) {
293 optlist[i].val = val;
295 /* #%$ hack for ksh semantics */
298 else if (flag == 'E')
303 error("Illegal option -%c", flag);
308 * Set the shell parameters.
312 setparam(char **argv)
318 for (nparam = 0 ; argv[nparam] ; nparam++);
319 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
321 *ap++ = savestr(*argv++);
324 freeparam(&shellparam);
325 shellparam.malloc = 1;
326 shellparam.nparam = nparam;
327 shellparam.p = newparam;
328 shellparam.reset = 1;
329 shellparam.optnext = NULL;
334 * Free the list of positional parameters.
338 freeparam(struct shparam *param)
343 for (ap = param->p ; *ap ; ap++)
352 * The shift builtin command.
356 shiftcmd(int argc, char **argv)
364 if (n > shellparam.nparam)
367 shellparam.nparam -= n;
368 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
369 if (shellparam.malloc)
373 while ((*ap2++ = *ap1++) != NULL);
374 shellparam.reset = 1;
382 * The set command builtin.
386 setcmd(int argc, char **argv)
389 return showvarscmd(argc, argv);
393 if (*argptr != NULL) {
402 getoptsreset(const char *value)
404 while (*value == '0')
406 if (strcmp(value, "1") == 0)
407 shellparam.reset = 1;
411 * The getopts builtin. Shellparam.optnext points to the next argument
412 * to be processed. Shellparam.optptr points to the next character to
413 * be processed in the current argument. If shellparam.optnext is NULL,
414 * then it's the first time getopts has been called.
418 getoptscmd(int argc, char **argv)
420 char **optbase = NULL;
423 error("usage: getopts optstring var [arg]");
425 optbase = shellparam.p;
429 if (shellparam.reset == 1) {
430 shellparam.optnext = optbase;
431 shellparam.optptr = NULL;
432 shellparam.reset = 0;
435 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
440 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
450 if ((p = *optptr) == NULL || *p == '\0') {
451 /* Current word is done, advance */
452 if (*optnext == NULL)
455 if (p == NULL || *p != '-' || *++p == '\0') {
457 ind = *optnext - optfirst + 1;
464 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
469 for (q = optstr; *q != c; ) {
471 if (optstr[0] == ':') {
474 err |= setvarsafe("OPTARG", s, 0);
477 out1fmt("Illegal option -%c\n", c);
478 (void) unsetvar("OPTARG");
488 if (*p == '\0' && (p = **optnext) == NULL) {
489 if (optstr[0] == ':') {
492 err |= setvarsafe("OPTARG", s, 0);
496 out1fmt("No arg for -%c option\n", c);
497 (void) unsetvar("OPTARG");
505 setvarsafe("OPTARG", p, 0);
509 setvarsafe("OPTARG", "", 0);
510 ind = *optnext - optfirst + 1;
519 fmtstr(s, sizeof(s), "%d", ind);
520 err |= setvarsafe("OPTIND", s, VNOFUNC);
523 err |= setvarsafe(optvar, s, 0);
534 * Standard option processing (a la getopt) for builtin routines. The
535 * only argument that is passed to nextopt is the option string; the
536 * other arguments are unnecessary. It return the character, or '\0' on
541 nextopt(const char *optstring)
547 if ((p = nextopt_optptr) == NULL || *p == '\0') {
549 if (p == NULL || *p != '-' || *++p == '\0')
552 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
556 for (q = optstring ; *q != c ; ) {
558 error("Illegal option -%c", c);
563 if (*p == '\0' && (p = *argptr++) == NULL)
564 error("No arg for -%c option", c);