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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 for (i = 0; i < NOPTS; i++)
101 if (optlist[i].val == 2)
104 if (sflag == 0 && minusc == NULL) {
105 commandname = arg0 = *argptr++;
106 setinputfile(commandname, 0);
108 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
109 if (argptr && minusc && *argptr)
112 shellparam.p = argptr;
113 shellparam.reset = 1;
114 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
126 setinteractive(iflag);
134 * Process shell options. The global variable argptr contains a pointer
135 * to the argument list; we advance it past the options.
147 while ((p = *argptr) != NULL) {
149 if ((c = *p++) == '-') {
151 /* A "-" or "--" terminates options */
154 if (p[0] == '-' && p[1] == '\0')
157 * For the benefit of `#!' lines in shell scripts,
158 * treat a string of '-- *#.*' the same as '--'.
159 * This is needed so that a script starting with:
160 * #!/bin/sh -- # -*- perl -*-
161 * will continue to work after a change is made to
162 * kern/imgact_shell.c to NOT token-ize the options
163 * specified on a '#!' line. A bit of a kludge,
164 * but that trick is recommended in documentation
165 * for some scripting languages, and we might as
166 * well continue to support it.
170 while (*kp == ' ' || *kp == '\t')
172 if (*kp == '#' || *kp == '\0')
175 } else if (c == '+') {
181 while ((c = *p++) != '\0') {
182 if (c == 'c' && cmdline) {
184 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
188 if (q == NULL || minusc != NULL)
189 error("Bad -c option");
194 } else if (c == 'o') {
195 minus_o(*argptr, val);
199 if (c == 'p' && !val && privileged) {
209 /* When processing `set', a single "-" means turn off -x and -v */
217 * When processing `set', a "--" means the remaining arguments
218 * replace the positional parameters in the active shell. If
219 * there are no remaining options, then all the positional
220 * parameters are cleared (equivalent to doing ``shift $#'').
230 * At this point we are processing options given to 'sh' on a command
231 * line. If an end-of-options marker ("-" or "--") is followed by an
232 * arg of "#", then skip over all remaining arguments. Some scripting
233 * languages (e.g.: perl) document that /bin/sh will implement this
234 * behavior, and they recommend that users take advantage of it to
235 * solve certain issues that can come up when writing a perl script.
236 * Yes, this feature is in /bin/sh to help users write perl scripts.
239 if (p != NULL && p[0] == '#' && p[1] == '\0') {
240 while (*argptr != NULL)
242 /* We need to keep the final argument */
248 minus_o(char *name, int val)
254 /* "Pretty" output. */
255 out1str("Current option settings\n");
256 for (i = 0; i < NOPTS; i++)
257 out1fmt("%-16s%s\n", optlist[i].name,
258 optlist[i].val ? "on" : "off");
260 /* Output suitable for re-input to shell. */
261 for (i = 0; i < NOPTS; i++) {
263 out1str(i == 0 ? "set" : "\nset");
264 out1fmt(" %co %s", optlist[i].val ? '-' : '+',
270 for (i = 0; i < NOPTS; i++)
271 if (equal(name, optlist[i].name)) {
272 if (!val && privileged && equal(name, "privileged")) {
276 setoption(optlist[i].letter, val);
279 error("Illegal option -o %s", name);
285 setoption(int flag, int val)
289 for (i = 0; i < NOPTS; i++)
290 if (optlist[i].letter == flag) {
291 optlist[i].val = val;
293 /* #%$ hack for ksh semantics */
296 else if (flag == 'E')
301 error("Illegal option -%c", flag);
312 for (i = 0; i < NOPTS; i++)
321 * Set the shell parameters.
325 setparam(char **argv)
331 for (nparam = 0 ; argv[nparam] ; nparam++);
332 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
334 *ap++ = savestr(*argv++);
337 freeparam(&shellparam);
338 shellparam.malloc = 1;
339 shellparam.nparam = nparam;
340 shellparam.p = newparam;
341 shellparam.optnext = NULL;
346 * Free the list of positional parameters.
350 freeparam(volatile struct shparam *param)
355 for (ap = param->p ; *ap ; ap++)
364 * The shift builtin command.
368 shiftcmd(int argc, char **argv)
376 if (n > shellparam.nparam)
379 shellparam.nparam -= n;
380 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
381 if (shellparam.malloc)
385 while ((*ap2++ = *ap1++) != NULL);
386 shellparam.optnext = NULL;
394 * The set command builtin.
398 setcmd(int argc, char **argv)
401 return showvarscmd(argc, argv);
405 if (*argptr != NULL) {
414 getoptsreset(const char *value)
416 if (number(value) == 1) {
417 shellparam.optnext = NULL;
418 shellparam.reset = 1;
423 * The getopts builtin. Shellparam.optnext points to the next argument
424 * to be processed. Shellparam.optptr points to the next character to
425 * be processed in the current argument. If shellparam.optnext is NULL,
426 * then it's the first time getopts has been called.
430 getoptscmd(int argc, char **argv)
432 char **optbase = NULL;
435 error("usage: getopts optstring var [arg]");
437 optbase = shellparam.p;
441 if (shellparam.reset == 1) {
442 shellparam.optnext = optbase;
443 shellparam.optptr = NULL;
444 shellparam.reset = 0;
447 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
452 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
462 if ((p = *optp) == NULL || *p == '\0') {
463 /* Current word is done, advance */
464 if (*optnext == NULL)
467 if (p == NULL || *p != '-' || *++p == '\0') {
469 ind = *optnext - optfirst + 1;
476 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
481 for (q = optstr; *q != c; ) {
483 if (optstr[0] == ':') {
486 err |= setvarsafe("OPTARG", s, 0);
489 out1fmt("Illegal option -%c\n", c);
500 if (*p == '\0' && (p = **optnext) == NULL) {
501 if (optstr[0] == ':') {
504 err |= setvarsafe("OPTARG", s, 0);
508 out1fmt("No arg for -%c option\n", c);
517 setvarsafe("OPTARG", p, 0);
521 setvarsafe("OPTARG", "", 0);
522 ind = *optnext - optfirst + 1;
531 fmtstr(s, sizeof(s), "%d", ind);
532 err |= setvarsafe("OPTIND", s, VNOFUNC);
535 err |= setvarsafe(optvar, s, 0);
546 * XXX - should get rid of. have all builtins use getopt(3). the
547 * library getopt must have the BSD extension static variable "optreset"
548 * otherwise it can't be used within the shell safely.
550 * Standard option processing (a la getopt) for builtin routines. The
551 * only argument that is passed to nextopt is the option string; the
552 * other arguments are unnecessary. It return the character, or '\0' on
557 nextopt(const char *optstring)
562 if ((p = optptr) == NULL || *p == '\0') {
564 if (p == NULL || *p != '-' || *++p == '\0')
567 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
571 for (q = optstring ; *q != c ; ) {
573 error("Illegal option -%c", c);
578 if (*p == '\0' && (p = *argptr++) == NULL)
579 error("No arg for -%c option", c);