diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/args.c | 137 |
1 files changed, 84 insertions, 53 deletions
@@ -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; |