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authorRob Landley <rob@landley.net>2012-11-19 01:49:53 -0600
committerRob Landley <rob@landley.net>2012-11-19 01:49:53 -0600
commit7f909bd163630a2ce710653e0fafb7bae7171745 (patch)
treec571f2baae1faf85e239338ec875cdb615c49583 /lib
parent6c62448f72ed9fc2b6a59ee09735283c07060cdb (diff)
downloadtoybox-7f909bd163630a2ce710653e0fafb7bae7171745.tar.gz
Teach option parsing about [groups] of related options.
Diffstat (limited to 'lib')
-rw-r--r--lib/args.c137
1 files changed, 84 insertions, 53 deletions
diff --git a/lib/args.c b/lib/args.c
index b7119651..dec133e2 100644
--- a/lib/args.c
+++ b/lib/args.c
@@ -28,12 +28,6 @@
// " " (space char) the "plus an argument" must be separate
// I.E. "-j 3" not "-j3". So "kill -stop" != "kill -s top"
//
-// These modify other option letters (previously seen in string):
-// +X enabling this enables X (switch on)
-// ~X enabling this disables X (switch off)
-// !X die with error if X already set (x!x die if x supplied twice)
-// [yz] needs at least one of y or z. TODO
-//
// at the beginning:
// ^ stop at first nonoption argument
// <0 die if less than # leftover arguments (default 0)
@@ -41,6 +35,14 @@
// ? Allow unknown arguments (pass them through to command).
// & first argument has imaginary dash (ala tar/ps)
// If given twice, all arguments have imaginary dash
+//
+// 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()
+// + First in group switches rest on [+abc] means -a=-abc, -b=-b, -c=-c
+// primarily useful if you can switch things back off again.
+//
// Notes from getopt man page
// - and -- cannot be arguments.
@@ -77,14 +79,14 @@
* this[1]="fruit" (argument to -b)
*/
-// Linked list of all known options (get_opt string is parsed into this).
+// Linked list of all known options (option string parsed into this).
struct opts {
struct opts *next;
long *arg; // Pointer into union "this" to store arguments at.
- uint32_t edx[3]; // Flag mask to enable/disable/exclude.
- int c; // Short argument character
+ int c; // Argument character to match
int flags; // |=1, ^=2
- char type; // Type of arguments to store
+ unsigned dex[3]; // which bits to disable/enable/exclude in toys.optflags
+ char type; // Type of arguments to store union "this"
union {
long l;
FLOAT f;
@@ -103,17 +105,16 @@ struct getoptflagstate
{
int argc, minargs, maxargs, nodash;
char *arg;
- struct opts *opts, *this;
+ struct opts *opts;
struct longopts *longopts;
int noerror, nodash_now, stopearly;
- uint32_t excludes;
+ unsigned excludes;
};
-// Parse one command line option.
-static int gotflag(struct getoptflagstate *gof)
+// Use getoptflagstate to parse parse one command line option from argv
+static int gotflag(struct getoptflagstate *gof, struct opts *opt)
{
int type;
- struct opts *opt = gof->this;
// Did we recognize this option?
if (!opt) {
@@ -122,11 +123,19 @@ static int gotflag(struct getoptflagstate *gof)
}
// Set flags
- toys.optflags |= opt->edx[0];
- toys.optflags &= ~opt->edx[1];
- gof->excludes = opt->edx[2];
+ toys.optflags &= ~opt->dex[0];
+ 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;
+ unsigned i = 1;
+
+ for (bad=gof->opts; gof->excludes && i; bad = bad->next) i<<=1;
+ error_exit("No '%c' with '%c'", opt->c, bad->c);
+ }
+
// Does this option take an argument?
gof->arg++;
type = opt->type;
@@ -169,17 +178,17 @@ static int gotflag(struct getoptflagstate *gof)
if (!gof->nodash_now) gof->arg = "";
}
- gof->this = NULL;
return 0;
}
-// Fill out toys.optflags and toys.optargs.
-
+// Parse this command's options string into struct getoptflagstate, which
+// includes a struct opts linked list in reverse order (I.E. right-to-left)
void parse_optflaglist(struct getoptflagstate *gof)
{
char *options = toys.which->options;
long *nextarg = (long *)&this;
struct opts *new = 0;
+ int idx;
// Parse option format string
memset(gof, 0, sizeof(struct getoptflagstate));
@@ -197,13 +206,14 @@ void parse_optflaglist(struct getoptflagstate *gof)
options++;
}
- // Parse the rest of the option string into a linked list
- // of options with attributes.
+ // Parse option string into a linked list of options with attributes.
if (!*options) gof->stopearly++;
while (*options) {
char *temp;
- int idx;
+
+ // Option groups come after all options are defined
+ if (*options == '[') break;
// Allocate a new list entry when necessary
if (!new) {
@@ -212,7 +222,6 @@ void parse_optflaglist(struct getoptflagstate *gof)
gof->opts = new;
new->val[0].l = LONG_MIN;
new->val[1].l = LONG_MAX;
- ++*(new->edx);
}
// Each option must start with "(" or an option character. (Bare
// longopts only come at the start of the string.)
@@ -241,19 +250,6 @@ void parse_optflaglist(struct getoptflagstate *gof)
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))) {
- struct opts *opt;
- int i;
-
- if (!*++options && CFG_TOYBOX_DEBUG) error_exit("+~! no target");
- // Find this option flag (in previously parsed struct opt)
- for (i=0, opt = new; ; opt = opt->next) {
- if (CFG_TOYBOX_DEBUG && !opt) error_exit("+~! unknown target");
- if (opt->c == *options) break;
- i++;
- }
- new->edx[idx] |= 1<<i;
- } else if (*options == '[') { // TODO
} else if (-1 != (idx = stridx("|^ ", *options))) new->flags |= 1<<idx;
// bounds checking
else if (-1 != (idx = stridx("<>=", *options))) {
@@ -282,25 +278,60 @@ void parse_optflaglist(struct getoptflagstate *gof)
}
// Initialize enable/disable/exclude masks and pointers to store arguments.
- // (We have to calculate all this ahead of time because longopts jump into
- // the middle of the list. We have to do this after creating the list
- // because we reverse direction: last entry created gets first global slot.)
- int pos = 0;
+ // (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) {
- int i;
-
- for (i=0;i<3;i++) new->edx[i] <<= pos;
- pos++;
+ new->dex[1] = 1<<idx++;
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 +-!");
+
+ // Don't advance past ] but do process it once in loop.
+ while (*(options++) != ']') {
+ struct opts *opt, *opt2 = 0;
+ 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 (idx == 3) {
+ opt2->dex[1] |= bits;
+ break;
+ }
+ if (bits&(1<<i)) opt->dex[idx] |= bits&~(1<<i);
+ } else {
+ if (CFG_TOYBOX_DEBUG && !opt)
+ error_exit("[] unknown target %c", *options);
+ if (opt->c == *options) {
+ bits |= 1<<i;
+ if (!opt2) opt2=opt;
+ break;
+ }
+ }
+ }
+ }
+ }
}
+// Fill out toys.optflags, toys.optargs, and this[] from toys.argv
+
void get_optflags(void)
{
struct getoptflagstate gof;
+ struct opts *catch;
long saveflags;
char *letters[]={"s",""};
@@ -318,7 +349,7 @@ void get_optflags(void)
// Iterate through command line arguments, skipping argv[0]
for (gof.argc=1; toys.argv[gof.argc]; gof.argc++) {
gof.arg = toys.argv[gof.argc];
- gof.this = NULL;
+ catch = NULL;
// Parse this argument
if (gof.stopearly>1) goto notflag;
@@ -350,7 +381,7 @@ void get_optflags(void)
}
// It's a match.
gof.arg = "";
- gof.this = lo->opt;
+ catch = lo->opt;
break;
}
}
@@ -362,7 +393,7 @@ void get_optflags(void)
}
// Long option parsed, handle option.
- gotflag(&gof);
+ gotflag(&gof, catch);
continue;
}
@@ -378,12 +409,12 @@ void get_optflags(void)
while (*gof.arg) {
// Identify next option char.
- for (gof.this = gof.opts; gof.this; gof.this = gof.this->next)
- if (*gof.arg == gof.this->c)
- if (!((gof.this->flags&4) && gof.arg[1])) break;
+ 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) ) {
+ if (gotflag(&gof, catch) ) {
toys.optflags = saveflags;
gof.arg = toys.argv[gof.argc];
goto notflag;