sys/src/cmd/mothra/forms.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <draw.h>
   4 #include <event.h>
   5 #include <panel.h>
   6 #include "mothra.h"
   7 #include "html.h"
   8
   9 typedef struct Field Field;
  10 typedef struct Option Option;
  11 struct Form{
  12         int method;
  13         char *ctype;
  14         char *action;
  15         Field *fields, *efields;
  16         Form *next;
  17 };
  18 struct Field{
  19         Field *next;
  20         Form *form;
  21         char *name;
  22         char *value;
  23         int checked;
  24         int size;               /* should be a point, but that feature is deprecated */
  25         int maxlength;
  26         int type;
  27         int rows, cols;
  28         Option *options;
  29         int multiple;
  30         int state;              /* is the button marked? */
  31         Panel *p;
  32         Panel *pulldown;
  33         Panel *textwin;
  34 };
  35 /*
  36  * Field types
  37  */
  38 enum{
  39         TYPEIN=1,
  40         CHECK,
  41         PASSWD,
  42         RADIO,
  43         SUBMIT,
  44         RESET,
  45         BUTTON,
  46         SELECT,
  47         TEXTWIN,
  48         HIDDEN,
  49         INDEX,
  50         FILE,
  51 };
  52 struct Option{
  53         int selected;
  54         int def;
  55         char label[NLABEL+1];
  56         char *value;
  57         Option *next;
  58 };
  59
  60 #define BOUNDARY "nAboJ9uN6ZXsqoVGzLAdjKq97TWDTGjo"
  61
  62 void h_checkinput(Panel *, int, int);
  63 void h_radioinput(Panel *, int, int);
  64 void h_submitinput(Panel *, int);
  65 void h_buttoninput(Panel *, int);
  66 void h_fileinput(Panel *, int);
  67 void h_submittype(Panel *, char *);
  68 void h_submitindex(Panel *, char *);
  69 void h_resetinput(Panel *, int);
  70 void h_select(Panel *, int, int);
  71 char *selgen(Panel *, int);
  72 char *nullgen(Panel *, int);
  73 Field *newfield(Form *form){
  74         Field *f;
  75         f=emallocz(sizeof(Field), 1);
  76         if(form->efields==0)
  77                 form->fields=f;
  78         else
  79                 form->efields->next=f;
  80         form->efields=f;
  81         f->next=0;
  82         f->form=form;
  83         return f;
  84 }
  85 /*
  86  * Called by rdhtml on seeing a forms-related tag
  87  */
  88 void rdform(Hglob *g){
  89         char *s;
  90         Field *f;
  91         Option *o, **op;
  92         Form *form;
  93         switch(g->tag){
  94         default:
  95                 fprint(2, "Bad tag <%s> in rdform (Can't happen!)\n", g->token);
  96                 return;
  97         case Tag_form:
  98                 if(g->form){
  99                         htmlerror(g->name, g->lineno, "nested forms illegal\n");
 100                         break;
 101                 }
 102                 g->form=emallocz(sizeof(Form), 1);
 103                 s=pl_getattr(g->attr, "action");
 104                 g->form->action=strdup((s && s[0]) ? s : g->dst->url->fullname);
 105                 s=pl_getattr(g->attr, "method");
 106                 if(s==0)
 107                         g->form->method=GET;
 108                 else if(cistrcmp(s, "post")==0)
 109                         g->form->method=POST;
 110                 else{
 111                         if(cistrcmp(s, "get")!=0)
 112                                 htmlerror(g->name, g->lineno,
 113                                         "unknown form method %s\n", s);
 114                         g->form->method=GET;
 115                 }
 116                 s=pl_getattr(g->attr, "enctype");
 117                 if(s && cistrcmp(s, "multipart/form-data")==0)
 118                         g->form->ctype = "multipart/form-data; boundary=" BOUNDARY;
 119                 g->form->fields=0;
 120
 121                 g->form->next = g->dst->form;
 122                 g->dst->form = g->form;
 123
 124                 break;
 125         case Tag_input:
 126         case Tag_button:
 127                 if(g->form==0){
 128                 BadTag:
 129                         htmlerror(g->name, g->lineno, "<%s> not in form, ignored\n",
 130                                 tag[g->tag].name);
 131                         break;
 132                 }
 133                 f=newfield(g->form);
 134                 s=pl_getattr(g->attr, "name");
 135                 if(s==0)
 136                         f->name=0;
 137                 else
 138                         f->name=strdup(s);
 139                 s=pl_getattr(g->attr, "value");
 140                 if(s==0)
 141                         f->value=strdup("");
 142                 else
 143                         f->value=strdup(s);
 144                 f->checked=pl_hasattr(g->attr, "checked");
 145                 s=pl_getattr(g->attr, "size");
 146                 if(s==0)
 147                         f->size=20;
 148                 else
 149                         f->size=atoi(s);
 150                 s=pl_getattr(g->attr, "maxlength");
 151                 if(s==0)
 152                         f->maxlength=0x3fffffff;
 153                 else
 154                         f->maxlength=atoi(s);
 155                 s=pl_getattr(g->attr, "type");
 156                 if((g->tag == Tag_button) &&
 157                    (s==0 || cistrcmp(s, "reset") || cistrcmp(s, "button")))
 158                         s="submit";
 159                 else if(s==0)
 160                         s="text";
 161                 if(cistrcmp(s, "checkbox")==0)
 162                         f->type=CHECK;
 163                 else if(cistrcmp(s, "radio")==0)
 164                         f->type=RADIO;
 165                 else if(cistrcmp(s, "submit")==0)
 166                         f->type=SUBMIT;
 167                 else if(cistrcmp(s, "button")==0)
 168                         f->type=BUTTON;
 169                 else if(cistrcmp(s, "image")==0)
 170                         f->type=FILE;
 171                 else if(cistrcmp(s, "file")==0)
 172                         f->type=FILE;
 173                 else if(cistrcmp(s, "reset")==0)
 174                         f->type=RESET;
 175                 else if(cistrcmp(s, "hidden")==0)
 176                         f->type=HIDDEN;
 177                 else{
 178                         f->type=TYPEIN;
 179                         if(cistrcmp(s, "password")==0)
 180                                 f->type=PASSWD;
 181
 182                         s=f->name;
 183                         if(s && cistrcmp(s, "isindex")==0)
 184                                 f->type=INDEX;
 185
 186                         /*
 187                          * If there's exactly one attribute, use its value as the name,
 188                          * regardless of the attribute name.  This makes
 189                          * http://linus.att.com/ias/puborder.html work.
 190                          */
 191                         if(s==0){
 192                                 if(g->attr[0].name && g->attr[1].name==0)
 193                                         f->name=strdup(g->attr[0].value);
 194                                 else
 195                                         f->name=strdup("no-name");
 196                         }
 197                 }
 198                 if((f->type==CHECK || f->type==RADIO) && !pl_hasattr(g->attr, "value")){
 199                         free(f->value);
 200                         f->value=strdup("on");
 201                 }
 202                 if(f->type!=HIDDEN)
 203                         pl_htmloutput(g, g->nsp, f->value[0]?f->value:"blank field", f);
 204                 break;
 205         case Tag_select:
 206                 if(g->form==0) goto BadTag;
 207                 f=newfield(g->form);
 208                 s=pl_getattr(g->attr, "name");
 209                 if(s==0){
 210                         f->name=strdup("select");
 211                         htmlerror(g->name, g->lineno, "select has no name=\n");
 212                 }
 213                 else
 214                         f->name=strdup(s);
 215                 s=pl_getattr(g->attr, "size");
 216                 if(s==0) f->size=4;
 217                 else{
 218                         f->size=atoi(s);
 219                         if(f->size<=0) f->size=1;
 220                 }
 221                 f->multiple=pl_hasattr(g->attr, "multiple");
 222                 f->type=SELECT;
 223                 f->options=0;
 224                 g->text=g->token;
 225                 g->tp=g->text;
 226                 g->etext=g->text;
 227                 break;
 228         case Tag_option:
 229                 if(g->form==0) goto BadTag;
 230                 if((f=g->form->efields)==0) goto BadTag;
 231                 o=emallocz(sizeof(Option), 1);
 232                 for(op=&f->options;*op;op=&(*op)->next);
 233                 *op=o;
 234                 o->next=0;
 235                 g->text=o->label;
 236                 g->tp=o->label;
 237                 g->etext=o->label+NLABEL;
 238                 memset(o->label, 0, NLABEL+1);
 239                 *g->tp++=' ';
 240                 o->def=pl_hasattr(g->attr, "selected");
 241                 o->selected=o->def;
 242                 if(pl_hasattr(g->attr, "disabled"))
 243                         o->selected=0;
 244                 s=pl_getattr(g->attr, "value");
 245                 if(s==0)
 246                         o->value=o->label+1;
 247                 else
 248                         o->value=strdup(s);
 249                 break;
 250         case Tag_textarea:
 251                 if(g->form==0) goto BadTag;
 252                 f=newfield(g->form);
 253                 s=pl_getattr(g->attr, "name");
 254                 if(s==0){
 255                         f->name=strdup("enter text");
 256                         htmlerror(g->name, g->lineno, "select has no name=\n");
 257                 }
 258                 else
 259                         f->name=strdup(s);
 260                 s=pl_getattr(g->attr, "rows");
 261                 f->rows=s?atoi(s):8;
 262                 s=pl_getattr(g->attr, "cols");
 263                 f->cols=s?atoi(s):30;
 264                 f->type=TEXTWIN;
 265                 /* suck up initial text */
 266                 pl_htmloutput(g, g->nsp, f->name, f);
 267                 break;
 268         case Tag_isindex:
 269                 /*
 270                  * Make up a form with one tag, of type INDEX
 271                  * I have seen a page with <ISINDEX PROMPT="Enter a title here ">,
 272                  * which is nonstandard and not handled here.
 273                  */
 274                 form=emalloc(sizeof(Form));
 275                 form->fields=0;
 276                 form->efields=0;
 277                 s=pl_getattr(g->attr, "action");
 278                 form->action=strdup((s && s[0]) ? s : g->dst->url->fullname);
 279                 form->method=GET;
 280                 form->fields=0;
 281                 f=newfield(form);
 282                 f->name=0;
 283                 f->value=strdup("");
 284                 f->size=20;
 285                 f->maxlength=0x3fffffff;
 286                 f->type=INDEX;
 287                 pl_htmloutput(g, g->nsp, f->value[0]?f->value:"blank field", f);
 288                 break;
 289         }
 290 }
 291 /*
 292  * Called by rdhtml on seeing a forms-related end tag
 293  */
 294 void endform(Hglob *g){
 295         Field *f;
 296
 297         switch(g->tag){
 298         case Tag_form:
 299                 g->form=0;
 300                 break;
 301         case Tag_select:
 302                 if(g->form==0)
 303                         htmlerror(g->name, g->lineno, "</select> not in form, ignored\n");
 304                 else if((f=g->form->efields)==0)
 305                         htmlerror(g->name, g->lineno, "spurious </select>\n");
 306                 else
 307                         pl_htmloutput(g, g->nsp, f->name, f);
 308                 break;
 309         case Tag_textarea:
 310                 break;
 311         }
 312 }
 313 char *nullgen(Panel *, int ){
 314         return 0;
 315 }
 316 char *selgen(Panel *p, int index){
 317         Option *a;
 318         Field *f;
 319         f=p->userp;
 320         if(f==0) return 0;
 321         for(a=f->options;index!=0 && a!=0;--index,a=a->next);
 322         if(a==0) return 0;
 323         a->label[0]=a->selected?'*':' ';
 324         return a->label;
 325 }
 326 char *seloption(Field *f){
 327         Option *a;
 328         for(a=f->options;a!=0;a=a->next)
 329                 if(a->selected)
 330                         return a->label+1;
 331         return f->name;
 332 }
 333 void mkfieldpanel(Rtext *t){
 334         Action *a;
 335         Panel *win, *scrl, *menu, *pop, *button;
 336         Field *f;
 337
 338         if((a = t->user) == nil)
 339                 return;
 340         if((f = a->field) == nil)
 341                 return;
 342
 343         f->p=0;
 344         switch(f->type){
 345         case TYPEIN:
 346                 f->p=plentry(0, 0, f->size*chrwidth, f->value, h_submittype);
 347                 break;
 348         case PASSWD:
 349                 f->p=plentry(0, USERFL, f->size*chrwidth, f->value, h_submittype);
 350                 break;
 351         case CHECK:
 352                 f->p=plcheckbutton(0, 0, "", h_checkinput);
 353                 f->state=f->checked;
 354                 plsetbutton(f->p, f->checked);
 355                 break;
 356         case RADIO:
 357                 f->p=plradiobutton(0, 0, "", h_radioinput);
 358                 f->state=f->checked;
 359                 plsetbutton(f->p, f->checked);
 360                 break;
 361         case SUBMIT:
 362                 f->p=plbutton(0, 0, f->value[0]?f->value:"submit", h_submitinput);
 363                 break;
 364         case RESET:
 365                 f->p=plbutton(0, 0, f->value[0]?f->value:"reset", h_resetinput);
 366                 break;
 367         case BUTTON:
 368                 f->p=plbutton(0, 0, f->value[0]?f->value:"button", h_buttoninput);
 369                 break;
 370         case FILE:
 371                 f->p=plbutton(0, 0, f->value[0]?f->value:"file", h_fileinput);
 372                 break;
 373         case SELECT:
 374                 f->pulldown=plgroup(0,0);
 375                 scrl=plscrollbar(f->pulldown, PACKW|FILLY);
 376                 win=pllist(f->pulldown, PACKN, nullgen, f->size, h_select);
 377                 win->userp=f;
 378                 plinitlist(win, PACKN, selgen, f->size, h_select);
 379                 plscroll(win, 0, scrl);
 380                 plpack(f->pulldown, Rect(0,0,1024,1024));
 381                 f->p=plpulldown(0, FIXEDX, seloption(f), f->pulldown, PACKS);
 382                 f->p->fixedsize.x=f->pulldown->r.max.x-f->pulldown->r.min.x;
 383                 break;
 384         case TEXTWIN:
 385                 f->p=plframe(0,0);
 386                 pllabel(f->p, PACKN|FILLX, f->name);
 387                 scrl=plscrollbar(f->p, PACKW|FILLY);
 388                 f->textwin=pledit(f->p, EXPAND, Pt(f->cols*chrwidth, f->rows*font->height),
 389                         0, 0, 0);
 390                 f->textwin->userp=f;
 391                 plscroll(f->textwin, 0, scrl);
 392                 break;
 393         case INDEX:
 394                 f->p=plentry(0, 0, f->size*chrwidth, f->value, h_submitindex);
 395                 break;
 396         }
 397         if(f->p){
 398                 f->p->userp=f;
 399                 free(t->text);
 400                 t->text=0;
 401                 t->p=f->p;
 402                 t->hot=1;
 403         }
 404 }
 405 void h_checkinput(Panel *p, int, int v){
 406         ((Field *)p->userp)->state=v;
 407 }
 408 void h_radioinput(Panel *p, int, int v){
 409         Field *f, *me;
 410         me=p->userp;
 411         me->state=v;
 412         if(v){
 413                 for(f=me->form->fields;f;f=f->next)
 414                         if(f->type==RADIO && f!=me && strcmp(f->name, me->name)==0){
 415                                 plsetbutton(f->p, 0);
 416                                 f->state=0;
 417                                 pldraw(f->p, screen);
 418                         }
 419         }
 420 }
 421 void h_select(Panel *p, int, int index){
 422         Option *a;
 423         Field *f;
 424         f=p->userp;
 425         if(f==0) return;
 426         if(!f->multiple) for(a=f->options;a;a=a->next) a->selected=0;
 427         for(a=f->options;index!=0 && a!=0;--index,a=a->next);
 428         if(a==0) return;
 429         a->selected=!a->selected;
 430         plinitpulldown(f->p, FIXEDX, seloption(f), f->pulldown, PACKS);
 431         pldraw(f->p, screen);
 432 }
 433 void h_resetinput(Panel *p, int){
 434         Field *f;
 435         Option *o;
 436         for(f=((Field *)p->userp)->form->fields;f;f=f->next) switch(f->type){
 437         case TYPEIN:
 438                 plinitentry(f->p, 0, f->size*chrwidth, f->value, 0);
 439                 break;
 440         case PASSWD:
 441                 plinitentry(f->p, USERFL, f->size*chrwidth, f->value, 0);
 442                 break;
 443         case CHECK:
 444         case RADIO:
 445                 f->state=f->checked;
 446                 plsetbutton(f->p, f->checked);
 447                 break;
 448         case SELECT:
 449                 for(o=f->options;o;o=o->next)
 450                         o->selected=o->def;
 451                 break;
 452         }
 453         pldraw(text, screen);
 454 }
 455 void h_buttoninput(Panel *p, int){
 456 }
 457 void h_fileinput(Panel *p, int){
 458         char name[NNAME];
 459         Field *f;
 460
 461         f = p->userp;
 462         nstrcpy(name, f->value, sizeof(name));
 463         for(;;){
 464                 if(eenter("Upload file", name, sizeof(name), &mouse) <= 0)
 465                         break;
 466                 if(access(name, AREAD) == 0)
 467                         break;
 468         }
 469         free(f->value);
 470         f->value = strdup(name);
 471         p->state = name[0] != 0;
 472         pldraw(f->p, screen);
 473 }
 474
 475 /*
 476  * If there's exactly one button with type=text, then
 477  * a CR in the button is supposed to submit the form.
 478  */
 479 void h_submittype(Panel *p, char *){
 480         int ntype;
 481         Field *f;
 482         ntype=0;
 483         for(f=((Field *)p->userp)->form->fields;f;f=f->next)
 484                 if(f->type==TYPEIN || f->type==PASSWD)
 485                         ntype++;
 486         if(ntype==1) h_submitinput(p, 0);
 487 }
 488 void h_submitindex(Panel *p, char *){
 489         h_submitinput(p, 0);
 490 }
 491
 492 void mencodeform(Form *form, int fd){
 493         char *b, *p, *sep;
 494         int ifd, n, nb;
 495         Option *o;
 496         Field *f;
 497         Rune *rp;
 498
 499         sep = "--" BOUNDARY;
 500         for(f=form->fields;f;f=f->next)switch(f->type){
 501         case TYPEIN:
 502         case PASSWD:
 503                 fprint(fd, "%s\r\nContent-Disposition: form-data; name=\"%s\"\r\n\r\n%s",
 504                         sep, f->name, plentryval(f->p));
 505                 sep = "\r\n--" BOUNDARY;
 506                 break;
 507         case CHECK:
 508         case RADIO:
 509                 if(!f->state) break;
 510         case SUBMIT:
 511         case HIDDEN:
 512                 if(f->name==0 || f->value==0)
 513                         continue;
 514                 fprint(fd, "%s\r\nContent-Disposition: form-data; name=\"%s\"\r\n\r\n%s",
 515                         sep, f->name, f->value);
 516                 sep = "\r\n--" BOUNDARY;
 517                 break;
 518         case SELECT:
 519                 if(f->name==0)
 520                         continue;
 521                 for(o=f->options;o;o=o->next)
 522                         if(o->selected && o->value){
 523                                 fprint(fd, "%s\r\nContent-Disposition: form-data; name=\"%s\"\r\n\r\n%s",
 524                                         sep, f->name, o->value);
 525                                 sep = "\r\n--" BOUNDARY;
 526                         }
 527                 break;
 528         case TEXTWIN:
 529                 if(f->name==0)
 530                         continue;
 531                 n=plelen(f->textwin);
 532                 rp=pleget(f->textwin);
 533                 p=b=malloc(UTFmax*n+1);
 534                 if(b == nil)
 535                         continue;
 536                 while(n > 0){
 537                         p += runetochar(p, rp);
 538                         rp++;
 539                         n--;
 540                 }
 541                 *p = 0;
 542                 fprint(fd, "%s\r\nContent-Disposition: form-data; name=\"%s\"\r\n\r\n%s",
 543                         sep, f->name, b);
 544                 sep = "\r\n--" BOUNDARY;
 545                 free(b);
 546                 break;
 547         case FILE:
 548                 if(f->name==0 || f->value[0]==0)
 549                         continue;
 550                 if(p = strrchr(f->value, '/'))
 551                         p++;
 552                 if(p == 0 || *p == 0)
 553                         p = f->value;
 554                 if((b = malloc(nb = 8192)) == nil)
 555                         continue;
 556                 if((ifd = open(f->value, OREAD)) >= 0){
 557                         if(filetype(ifd, b, nb) < 0)
 558                                 strcpy(b, "application/octet-stream");
 559                         fprint(fd, "%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\""
 560                                 "\r\nContent-Type: %s\r\n\r\n", sep, f->name, p, b);
 561                         sep = "\r\n--" BOUNDARY;
 562                         while((n = read(ifd, b, nb)) > 0)
 563                                 if(write(fd, b, n) != n)
 564                                         break;
 565                         close(ifd);
 566                 }
 567                 free(b);
 568                 break;
 569         }
 570         fprint(fd, "%s--\r\n", sep);
 571 }
 572
 573 void uencodeform(Form *form, int fd){
 574         char *b, *p, *sep;
 575         Option *o;
 576         Field *f;
 577         Rune *rp;
 578         int n;
 579
 580         sep = "";
 581         for(f=form->fields;f;f=f->next) switch(f->type){
 582         case TYPEIN:
 583         case PASSWD:
 584                 fprint(fd, "%s%U=%U", sep, f->name, plentryval(f->p));
 585                 sep = "&";
 586                 break;
 587         case INDEX:
 588                 fprint(fd, "%s%U", sep, plentryval(f->p));
 589                 sep = "&";
 590                 break;
 591         case CHECK:
 592         case RADIO:
 593                 if(!f->state) break;
 594         case SUBMIT:
 595         case HIDDEN:
 596                 if(f->name==0 || f->value==0)
 597                         continue;
 598                 fprint(fd, "%s%U=%U", sep, f->name, f->value);
 599                 sep = "&";
 600                 break;
 601         case SELECT:
 602                 if(f->name==0)
 603                         continue;
 604                 for(o=f->options;o;o=o->next)
 605                         if(o->selected && o->value){
 606                                 fprint(fd, "%s%U=%U", sep, f->name, o->value);
 607                                 sep = "&";
 608                         }
 609                 break;
 610         case TEXTWIN:
 611                 if(f->name==0)
 612                         continue;
 613                 n=plelen(f->textwin);
 614                 rp=pleget(f->textwin);
 615                 p=b=malloc(UTFmax*n+1);
 616                 if(b == nil)
 617                         continue;
 618                 while(n > 0){
 619                         p += runetochar(p, rp);
 620                         rp++;
 621                         n--;
 622                 }
 623                 *p = 0;
 624                 fprint(fd, "%s%U=%U", sep, f->name, b);
 625                 sep = "&";
 626                 free(b);
 627                 break;
 628         }
 629 }
 630
 631 void h_submitinput(Panel *p, int){
 632         char buf[NNAME];
 633         Form *form;
 634         int n, fd;
 635
 636         form=((Field *)p->userp)->form;
 637         if(form->method==GET){
 638                 strcpy(buf, "/tmp/mfXXXXXXXXXXX");
 639                 fd = create(mktemp(buf), ORDWR|ORCLOSE, 0600);
 640         } else
 641                 fd = urlpost(selurl(form->action), form->ctype);
 642         if(fd < 0){
 643                 message("submit: %r");
 644                 return;
 645         }
 646         if(form->method==GET){
 647                 fprint(fd, "%s?", form->action);
 648                 uencodeform(form, fd);
 649                 seek(fd, 0, 0);
 650                 n = readn(fd, buf, sizeof(buf));
 651                 close(fd);
 652                 if(n < 0 || n >= sizeof(buf)){
 653                         message("submit: too large");
 654                         return;
 655                 }
 656                 buf[n] = 0;
 657                 if(debug)fprint(2, "GET %s\n", buf);
 658                 geturl(buf, -1, 0, 0);
 659         } else {
 660                 /* only set for multipart/form-data */
 661                 if(form->ctype)
 662                         mencodeform(form, fd);
 663                 else
 664                         uencodeform(form, fd);
 665                 if(debug)fprint(2, "POST %s\n", form->action);
 666                 geturl(form->action, fd, 0, 0);
 667         }
 668 }
 669
 670 void freeform(void *p)
 671 {
 672         Form *form;
 673         Field *f;
 674         Option *o;
 675
 676         while(form = p){
 677                 p = form->next;
 678                 free(form->action);
 679                 while(f = form->fields){
 680                         form->fields = f->next;
 681
 682                         if(f->p!=0)
 683                                 plfree(f->p);
 684
 685                         free(f->name);
 686                         free(f->value);
 687
 688                         while(o = f->options){
 689                                 f->options = o->next;
 690                                 if(o->value != o->label+1)
 691                                         free(o->value);
 692                                 free(o);
 693                         }
 694
 695                         free(f);
 696                 }
 697                 free(form);
 698         }
 699 }
 700
 701 int Ufmt(Fmt *f){
 702         char *s = va_arg(f->args, char*);
 703         for(; *s; s++){
 704                 if(strchr("/$-_@.!*'(),", *s)
 705                 || 'a'<=*s && *s<='z'
 706                 || 'A'<=*s && *s<='Z'
 707                 || '0'<=*s && *s<='9')
 708                         fmtprint(f, "%c", *s);
 709                 else if(*s==' ')
 710                         fmtprint(f, "+");
 711                 else
 712                         fmtprint(f, "%%%.2X", *s & 0xFF);
 713         }
 714         return 0;
 715 }