You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
508 lines
16 KiB
508 lines
16 KiB
/* args.c - Command line argument parsing.
|
|
*
|
|
* Copyright 2006 Rob Landley <rob@landley.net>
|
|
*/
|
|
|
|
// NOTE: If option parsing segfaults, switch on TOYBOX_DEBUG in menuconfig to
|
|
// add syntax checks to option string parsing which aren't needed in the final
|
|
// code (since get_opt string is hardwired and should be correct when you ship)
|
|
|
|
#include "toys.h"
|
|
|
|
// Design goals:
|
|
// Don't use getopt() out of libc.
|
|
// Don't permute original arguments (screwing up ps/top output).
|
|
// Integrated --long options "(noshort)a(along)b(blong1)(blong2)"
|
|
|
|
/* This uses a getopt-like option string, but not getopt() itself. We call
|
|
* it the get_opt string.
|
|
*
|
|
* Each option in the get_opt string corresponds to a bit position in the
|
|
* return value. The rightmost argument is (1<<0), the next to last is (1<<1)
|
|
* and so on. If the option isn't seen in argv[], its bit remains 0.
|
|
*
|
|
* Options which have an argument fill in the corresponding slot in the global
|
|
* union "this" (see generated/globals.h), which it treats as an array of longs
|
|
* (note that sizeof(long)==sizeof(pointer) is guaranteed by LP64).
|
|
*
|
|
* You don't have to free the option strings, which point into the environment
|
|
* space. List objects should be freed by main() when command_main() returns.
|
|
*
|
|
* Example:
|
|
* Calling get_optflags() when toys.which->options="ab:c:d" and
|
|
* argv = ["command", "-b", "fruit", "-d", "walrus"] results in:
|
|
*
|
|
* Changes to struct toys:
|
|
* toys.optflags = 5 (I.E. 0101 so -b = 4 | -d = 1)
|
|
* toys.optargs[0] = "walrus" (leftover argument)
|
|
* toys.optargs[1] = NULL (end of list)
|
|
* toys.optc = 1 (there was 1 leftover argument)
|
|
*
|
|
* Changes to union this:
|
|
* this[0]=NULL (because -c didn't get an argument this time)
|
|
* this[1]="fruit" (argument to -b)
|
|
*/
|
|
|
|
// What you can put in a get_opt string:
|
|
// Any otherwise unused character (all letters, unprefixed numbers) specify
|
|
// an option that sets a flag. The bit value is the same as the binary digit
|
|
// if you string the option characters together in order.
|
|
// So in "abcdefgh" a = 128, h = 1
|
|
//
|
|
// Suffixes specify that this option takes an argument (stored in GLOBALS):
|
|
// Note that pointer and long are always the same size, even on 64 bit.
|
|
// : string argument, keep most recent if more than one
|
|
// * string argument, appended to a struct arg_list linked list.
|
|
// # signed long argument
|
|
// <LOW - die if less than LOW
|
|
// >HIGH - die if greater than HIGH
|
|
// =DEFAULT - value if not specified
|
|
// - signed long argument defaulting to negative (say + for positive)
|
|
// . double precision floating point argument (with CFG_TOYBOX_FLOAT)
|
|
// Chop this option out with USE_TOYBOX_FLOAT() in option string
|
|
// Same <LOW>HIGH=DEFAULT as #
|
|
// @ occurrence counter (which is a long)
|
|
// % time offset in milliseconds with optional s/m/h/d suffix
|
|
// (longopt)
|
|
// | this is required. If more than one marked, only one required.
|
|
// ; long option's argument is optional (can only be supplied with --opt=)
|
|
// ^ Stop parsing after encountering this argument
|
|
// " " (space char) the "plus an argument" must be separate
|
|
// I.E. "-j 3" not "-j3". So "kill -stop" != "kill -s top"
|
|
//
|
|
// At the beginning of the get_opt string (before any options):
|
|
// ^ stop at first nonoption argument
|
|
// <0 die if less than # leftover arguments (default 0)
|
|
// >9 die if > # leftover arguments (default MAX_INT)
|
|
// ? Allow unknown arguments (pass them through to command).
|
|
// & first arg has imaginary dash (ala tar/ps/ar) which sets FLAGS_NODASH
|
|
// 0 Include argv[0] in optargs
|
|
//
|
|
// At the end: [groups] of previously seen options
|
|
// - Only one in group (switch off) [-abc] means -ab=-b, -ba=-a, -abc=-c
|
|
// + Synonyms (switch on all) [+abc] means -ab=-abc, -c=-abc
|
|
// ! More than one in group is error [!abc] means -ab calls error_exit()
|
|
// primarily useful if you can switch things back off again.
|
|
//
|
|
// You may use octal escapes with the high bit (127) set to use a control
|
|
// character as an option flag. For example, \300 would be the option -@
|
|
|
|
// Notes from getopt man page
|
|
// - and -- cannot be arguments.
|
|
// -- force end of arguments
|
|
// - is a synonym for stdin in file arguments
|
|
// -abcd means -a -b -c -d (but if -b takes an argument, then it's -a -b cd)
|
|
|
|
// Linked list of all known options (option string parsed into this).
|
|
// Hangs off getoptflagstate, freed at end of option parsing.
|
|
struct opts {
|
|
struct opts *next;
|
|
long *arg; // Pointer into union "this" to store arguments at.
|
|
int c; // Argument character to match
|
|
int flags; // |=1, ^=2, " "=4, ;=8
|
|
unsigned long long dex[3]; // bits to disable/enable/exclude in toys.optflags
|
|
char type; // Type of arguments to store union "this"
|
|
union {
|
|
long l;
|
|
FLOAT f;
|
|
} val[3]; // low, high, default - range of allowed values
|
|
};
|
|
|
|
// linked list of long options. (Hangs off getoptflagstate, free at end of
|
|
// option parsing, details about flag to set and global slot to fill out
|
|
// stored in related short option struct, but if opt->c = -1 the long option
|
|
// is "bare" (has no corresponding short option).
|
|
struct longopts {
|
|
struct longopts *next;
|
|
struct opts *opt;
|
|
char *str;
|
|
int len;
|
|
};
|
|
|
|
// State during argument parsing.
|
|
struct getoptflagstate
|
|
{
|
|
int argc, minargs, maxargs;
|
|
char *arg;
|
|
struct opts *opts;
|
|
struct longopts *longopts;
|
|
int noerror, nodash_now, stopearly;
|
|
unsigned excludes, requires;
|
|
};
|
|
|
|
// Use getoptflagstate to parse one command line option from argv
|
|
static int gotflag(struct getoptflagstate *gof, struct opts *opt, int shrt)
|
|
{
|
|
unsigned long long i;
|
|
int type;
|
|
|
|
// Did we recognize this option?
|
|
if (!opt) {
|
|
if (gof->noerror) return 1;
|
|
help_exit("Unknown option '%s'", gof->arg);
|
|
}
|
|
|
|
// Might enabling this switch off something else?
|
|
if (toys.optflags & opt->dex[0]) {
|
|
struct opts *clr;
|
|
|
|
// Forget saved argument for flag we switch back off
|
|
for (clr=gof->opts, i=1; clr; clr = clr->next, i<<=1)
|
|
if (clr->arg && (i & toys.optflags & opt->dex[0])) *clr->arg = 0;
|
|
toys.optflags &= ~opt->dex[0];
|
|
}
|
|
|
|
// Set flags
|
|
toys.optflags |= opt->dex[1];
|
|
gof->excludes |= opt->dex[2];
|
|
if (opt->flags&2) gof->stopearly=2;
|
|
|
|
if (toys.optflags & gof->excludes) {
|
|
struct opts *bad;
|
|
|
|
for (bad=gof->opts, i=1; bad ;bad = bad->next, i<<=1) {
|
|
if (opt == bad || !(i & toys.optflags)) continue;
|
|
if (toys.optflags & bad->dex[2]) break;
|
|
}
|
|
if (bad) help_exit("No '%c' with '%c'", opt->c, bad->c);
|
|
}
|
|
|
|
// Does this option take an argument?
|
|
if (!gof->arg || (shrt && !gof->arg[1])) {
|
|
gof->arg = 0;
|
|
if (opt->flags & 8) return 0;
|
|
gof->arg = "";
|
|
} else gof->arg++;
|
|
type = opt->type;
|
|
|
|
if (type == '@') ++*(opt->arg);
|
|
else if (type) {
|
|
char *arg = gof->arg;
|
|
|
|
// Handle "-xblah" and "-x blah", but also a third case: "abxc blah"
|
|
// to make "tar xCjfv blah1 blah2 thingy" work like
|
|
// "tar -x -C blah1 -j -f blah2 -v thingy"
|
|
|
|
if (gof->nodash_now || (!arg[0] && !(opt->flags & 8)))
|
|
arg = toys.argv[++gof->argc];
|
|
if (!arg) {
|
|
char *s = "Missing argument to ";
|
|
struct longopts *lo;
|
|
|
|
if (opt->c != -1) help_exit("%s-%c", s, opt->c);
|
|
|
|
for (lo = gof->longopts; lo->opt != opt; lo = lo->next);
|
|
help_exit("%s--%.*s", s, lo->len, lo->str);
|
|
}
|
|
|
|
if (type == ':') *(opt->arg) = (long)arg;
|
|
else if (type == '*') {
|
|
struct arg_list **list;
|
|
|
|
list = (struct arg_list **)opt->arg;
|
|
while (*list) list=&((*list)->next);
|
|
*list = xzalloc(sizeof(struct arg_list));
|
|
(*list)->arg = arg;
|
|
} else if (type == '#' || type == '-') {
|
|
long l = atolx(arg);
|
|
if (type == '-' && !ispunct(*arg)) l*=-1;
|
|
if (l < opt->val[0].l) help_exit("-%c < %ld", opt->c, opt->val[0].l);
|
|
if (l > opt->val[1].l) help_exit("-%c > %ld", opt->c, opt->val[1].l);
|
|
|
|
*(opt->arg) = l;
|
|
} else if (CFG_TOYBOX_FLOAT && type == '.') {
|
|
FLOAT *f = (FLOAT *)(opt->arg);
|
|
|
|
*f = strtod(arg, &arg);
|
|
if (opt->val[0].l != LONG_MIN && *f < opt->val[0].f)
|
|
help_exit("-%c < %lf", opt->c, (double)opt->val[0].f);
|
|
if (opt->val[1].l != LONG_MAX && *f > opt->val[1].f)
|
|
help_exit("-%c > %lf", opt->c, (double)opt->val[1].f);
|
|
} else if (type=='%') *(opt->arg) = xparsemillitime(arg);
|
|
|
|
if (!gof->nodash_now) gof->arg = "";
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Parse this command's options string into struct getoptflagstate, which
|
|
// includes a struct opts linked list in reverse order (I.E. right-to-left)
|
|
static int parse_optflaglist(struct getoptflagstate *gof)
|
|
{
|
|
char *options = toys.which->options;
|
|
long *nextarg = (long *)&this;
|
|
struct opts *new = 0;
|
|
int idx, rc = 0;
|
|
|
|
// Parse option format string
|
|
memset(gof, 0, sizeof(struct getoptflagstate));
|
|
gof->maxargs = INT_MAX;
|
|
if (!options) return 0;
|
|
|
|
// Parse leading special behavior indicators
|
|
for (;;) {
|
|
if (*options == '^') gof->stopearly++;
|
|
else if (*options == '<') gof->minargs=*(++options)-'0';
|
|
else if (*options == '>') gof->maxargs=*(++options)-'0';
|
|
else if (*options == '?') gof->noerror++;
|
|
else if (*options == '&') gof->nodash_now = 1;
|
|
else if (*options == '0') rc = 1;
|
|
else break;
|
|
options++;
|
|
}
|
|
|
|
// Parse option string into a linked list of options with attributes.
|
|
|
|
if (!*options) gof->stopearly++;
|
|
while (*options) {
|
|
char *temp;
|
|
|
|
// Option groups come after all options are defined
|
|
if (*options == '[') break;
|
|
|
|
// Allocate a new list entry when necessary
|
|
if (!new) {
|
|
new = xzalloc(sizeof(struct opts));
|
|
new->next = gof->opts;
|
|
gof->opts = new;
|
|
new->val[0].l = LONG_MIN;
|
|
new->val[1].l = LONG_MAX;
|
|
}
|
|
// Each option must start with "(" or an option character. (Bare
|
|
// longopts only come at the start of the string.)
|
|
if (*options == '(' && new->c != -1) {
|
|
char *end;
|
|
struct longopts *lo;
|
|
|
|
// Find the end of the longopt
|
|
for (end = ++options; *end && *end != ')'; end++);
|
|
if (CFG_TOYBOX_DEBUG && !*end) error_exit("(longopt) didn't end");
|
|
|
|
// init a new struct longopts
|
|
lo = xmalloc(sizeof(struct longopts));
|
|
lo->next = gof->longopts;
|
|
lo->opt = new;
|
|
lo->str = options;
|
|
lo->len = end-options;
|
|
gof->longopts = lo;
|
|
options = ++end;
|
|
|
|
// Mark this struct opt as used, even when no short opt.
|
|
if (!new->c) new->c = -1;
|
|
|
|
continue;
|
|
|
|
// If this is the start of a new option that wasn't a longopt,
|
|
|
|
} else if (strchr(":*#@.-%", *options)) {
|
|
if (CFG_TOYBOX_DEBUG && new->type)
|
|
error_exit("multiple types %c:%c%c", new->c, new->type, *options);
|
|
new->type = *options;
|
|
} else if (-1 != (idx = stridx("|^ ;", *options))) new->flags |= 1<<idx;
|
|
// bounds checking
|
|
else if (-1 != (idx = stridx("<>=", *options))) {
|
|
if (new->type == '#' || new->type == '%') {
|
|
long l = strtol(++options, &temp, 10);
|
|
if (temp != options) new->val[idx].l = l;
|
|
} else if (CFG_TOYBOX_FLOAT && new->type == '.') {
|
|
FLOAT f = strtod(++options, &temp);
|
|
if (temp != options) new->val[idx].f = f;
|
|
} else error_exit("<>= only after .#%%");
|
|
options = --temp;
|
|
|
|
// At this point, we've hit the end of the previous option. The
|
|
// current character is the start of a new option. If we've already
|
|
// assigned an option to this struct, loop to allocate a new one.
|
|
// (It'll get back here afterwards and fall through to next else.)
|
|
} else if (new->c) {
|
|
new = 0;
|
|
continue;
|
|
|
|
// Claim this option, loop to see what's after it.
|
|
} else new->c = 127&*options;
|
|
|
|
options++;
|
|
}
|
|
|
|
// Initialize enable/disable/exclude masks and pointers to store arguments.
|
|
// (This goes right to left so we need the whole list before we can start.)
|
|
idx = 0;
|
|
for (new = gof->opts; new; new = new->next) {
|
|
unsigned long long u = 1LL<<idx++;
|
|
|
|
if (new->c == 1) new->c = 0;
|
|
new->dex[1] = u;
|
|
if (new->flags & 1) gof->requires |= u;
|
|
if (new->type) {
|
|
new->arg = (void *)nextarg;
|
|
*(nextarg++) = new->val[2].l;
|
|
}
|
|
}
|
|
|
|
// Parse trailing group indicators
|
|
while (*options) {
|
|
unsigned bits = 0;
|
|
|
|
if (CFG_TOYBOX_DEBUG && *options != '[') error_exit("trailing %s", options);
|
|
|
|
idx = stridx("-+!", *++options);
|
|
if (CFG_TOYBOX_DEBUG && idx == -1) error_exit("[ needs +-!");
|
|
if (CFG_TOYBOX_DEBUG && (options[1] == ']' || !options[1]))
|
|
error_exit("empty []");
|
|
|
|
// Don't advance past ] but do process it once in loop.
|
|
while (*options++ != ']') {
|
|
struct opts *opt;
|
|
int i;
|
|
|
|
if (CFG_TOYBOX_DEBUG && !*options) error_exit("[ without ]");
|
|
// Find this option flag (in previously parsed struct opt)
|
|
for (i=0, opt = gof->opts; ; i++, opt = opt->next) {
|
|
if (*options == ']') {
|
|
if (!opt) break;
|
|
if (bits&(1<<i)) opt->dex[idx] |= bits&~(1<<i);
|
|
} else {
|
|
if (*options==1) break;
|
|
if (CFG_TOYBOX_DEBUG && !opt)
|
|
error_exit("[] unknown target %c", *options);
|
|
if (opt->c == *options) {
|
|
bits |= 1<<i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
// Fill out toys.optflags, toys.optargs, and this[] from toys.argv
|
|
|
|
void get_optflags(void)
|
|
{
|
|
struct getoptflagstate gof;
|
|
struct opts *catch;
|
|
unsigned long long saveflags;
|
|
char *letters[]={"s",""};
|
|
|
|
// Option parsing is a two stage process: parse the option string into
|
|
// a struct opts list, then use that list to process argv[];
|
|
|
|
toys.exitval = toys.which->flags >> 24;
|
|
|
|
// Allocate memory for optargs
|
|
saveflags = toys.optc = parse_optflaglist(&gof);
|
|
while (toys.argv[saveflags++]);
|
|
toys.optargs = xzalloc(sizeof(char *)*saveflags);
|
|
if (toys.optc) *toys.optargs = *toys.argv;
|
|
|
|
if (toys.argv[1] && toys.argv[1][0] == '-') gof.nodash_now = 0;
|
|
|
|
// Iterate through command line arguments, skipping argv[0]
|
|
for (gof.argc=1; toys.argv[gof.argc]; gof.argc++) {
|
|
gof.arg = toys.argv[gof.argc];
|
|
catch = 0;
|
|
|
|
// Parse this argument
|
|
if (gof.stopearly>1) goto notflag;
|
|
|
|
if (gof.argc>1 || *gof.arg=='-') gof.nodash_now = 0;
|
|
|
|
// Various things with dashes
|
|
if (*gof.arg == '-') {
|
|
|
|
// Handle -
|
|
if (!gof.arg[1]) goto notflag;
|
|
gof.arg++;
|
|
if (*gof.arg=='-') {
|
|
struct longopts *lo;
|
|
|
|
gof.arg++;
|
|
// Handle --
|
|
if (!*gof.arg) {
|
|
gof.stopearly += 2;
|
|
continue;
|
|
}
|
|
|
|
// do we match a known --longopt?
|
|
for (lo = gof.longopts; lo; lo = lo->next) {
|
|
if (!strncmp(gof.arg, lo->str, lo->len)) {
|
|
if (!gof.arg[lo->len]) gof.arg = 0;
|
|
else if (gof.arg[lo->len] == '=' && lo->opt->type)
|
|
gof.arg += lo->len;
|
|
else continue;
|
|
// It's a match.
|
|
catch = lo->opt;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Should we handle this --longopt as a non-option argument?
|
|
if (!lo && gof.noerror) {
|
|
gof.arg -= 2;
|
|
goto notflag;
|
|
}
|
|
|
|
// Long option parsed, handle option.
|
|
gotflag(&gof, catch, 0);
|
|
continue;
|
|
}
|
|
|
|
// Handle things that don't start with a dash.
|
|
} else {
|
|
if (gof.nodash_now) toys.optflags |= FLAGS_NODASH;
|
|
else goto notflag;
|
|
}
|
|
|
|
// At this point, we have the args part of -args. Loop through
|
|
// each entry (could be -abc meaning -a -b -c)
|
|
saveflags = toys.optflags;
|
|
while (gof.arg && *gof.arg) {
|
|
|
|
// Identify next option char.
|
|
for (catch = gof.opts; catch; catch = catch->next)
|
|
if (*gof.arg == catch->c)
|
|
if (!((catch->flags&4) && gof.arg[1])) break;
|
|
|
|
// Handle option char (advancing past what was used)
|
|
if (gotflag(&gof, catch, 1) ) {
|
|
toys.optflags = saveflags;
|
|
gof.arg = toys.argv[gof.argc];
|
|
goto notflag;
|
|
}
|
|
}
|
|
continue;
|
|
|
|
// Not a flag, save value in toys.optargs[]
|
|
notflag:
|
|
if (gof.stopearly) gof.stopearly++;
|
|
toys.optargs[toys.optc++] = toys.argv[gof.argc];
|
|
}
|
|
|
|
// Sanity check
|
|
if (toys.optc<gof.minargs)
|
|
help_exit("Need%s %d argument%s", letters[!!(gof.minargs-1)],
|
|
gof.minargs, letters[!(gof.minargs-1)]);
|
|
if (toys.optc>gof.maxargs)
|
|
help_exit("Max %d argument%s", gof.maxargs, letters[!(gof.maxargs-1)]);
|
|
if (gof.requires && !(gof.requires & toys.optflags)) {
|
|
struct opts *req;
|
|
char needs[32], *s = needs;
|
|
|
|
for (req = gof.opts; req; req = req->next)
|
|
if (req->flags & 1) *(s++) = req->c;
|
|
*s = 0;
|
|
|
|
help_exit("Needs %s-%s", s[1] ? "one of " : "", needs);
|
|
}
|
|
|
|
toys.exitval = 0;
|
|
|
|
if (CFG_TOYBOX_FREE) {
|
|
llist_traverse(gof.opts, free);
|
|
llist_traverse(gof.longopts, free);
|
|
}
|
|
}
|