ref: c8b187f9db503465460d8bafa2d7a758bbcf59ca
dir: /libtk/varbl.c/
#include <lib9.h> #include <kernel.h> #include "draw.h" #include "tk.h" #include "label.h" char* tksetvar(TkTop *top, char *c, char *newval) { TkVar *v; TkWin *tkw; Tk *f, *m; void (*vc)(Tk*, char*, char*); if (c == nil || c[0] == '\0') return nil; v = tkmkvar(top, c, TkVstring); if(v == nil) return TkNomem; if(v->type != TkVstring) return TkNotvt; if(newval == nil) newval = ""; if(v->value != nil) { if (strcmp(v->value, newval) == 0) return nil; free(v->value); } v->value = strdup(newval); if(v->value == nil) return TkNomem; for(f = top->root; f; f = f->siblings) { if(f->type == TKmenu) { tkw = TKobj(TkWin, f); for(m = tkw->slave; m; m = m->next) if ((vc = tkmethod[m->type]->varchanged) != nil) (*vc)(m, c, newval); } else if ((vc = tkmethod[f->type]->varchanged) != nil) (*vc)(f, c, newval); } return nil; } char* tkvariable(TkTop *t, char *arg, char **ret) { TkVar *v; char *fmt, *e, *buf, *ebuf, *val; int l; l = strlen(arg) + 2; buf = malloc(l); if(buf == nil) return TkNomem; ebuf = buf+l; arg = tkword(t, arg, buf, ebuf, nil); arg = tkskip(arg, " \t"); if (*arg == '\0') { if(strcmp(buf, "lasterror") == 0) { free(buf); if(t->err == nil) return nil; fmt = "%s: %s"; if(strlen(t->errcmd) == sizeof(t->errcmd)-1) fmt = "%s...: %s"; e = tkvalue(ret, fmt, t->errcmd, t->err); t->err = nil; return e; } v = tkmkvar(t, buf, 0); free(buf); if(v == nil || v->value == nil) return nil; if(v->type != TkVstring) return TkNotvt; return tkvalue(ret, "%s", v->value); } val = buf+strlen(buf)+1; tkword(t, arg, val, ebuf, nil); e = tksetvar(t, buf, val); free(buf); return e; }