175 lines
2.8 KiB
C
175 lines
2.8 KiB
C
#include <u.h>
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#include <libc.h>
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#include <auth.h>
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int
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_attrfmt(Fmt *fmt)
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{
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char *b, buf[1024], *ebuf;
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Attr *a;
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ebuf = buf+sizeof buf;
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b = buf;
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strcpy(buf, " ");
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for(a=va_arg(fmt->args, Attr*); a; a=a->next){
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if(a->name == nil)
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continue;
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switch(a->type){
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case AttrQuery:
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b = seprint(b, ebuf, " %q?", a->name);
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break;
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case AttrNameval:
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b = seprint(b, ebuf, " %q=%q", a->name, a->val);
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break;
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case AttrDefault:
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b = seprint(b, ebuf, " %q:=%q", a->name, a->val);
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break;
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}
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}
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return fmtstrcpy(fmt, buf+1);
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}
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Attr*
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_copyattr(Attr *a)
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{
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Attr **la, *na;
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na = nil;
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la = &na;
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for(; a; a=a->next){
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*la = _mkattr(a->type, a->name, a->val, nil);
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setmalloctag(*la, getcallerpc(&a));
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la = &(*la)->next;
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}
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*la = nil;
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return na;
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}
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Attr*
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_delattr(Attr *a, char *name)
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{
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Attr *fa;
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Attr **la;
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for(la=&a; *la; ){
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if(strcmp((*la)->name, name) == 0){
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fa = *la;
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*la = (*la)->next;
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fa->next = nil;
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_freeattr(fa);
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}else
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la=&(*la)->next;
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}
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return a;
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}
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Attr*
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_findattr(Attr *a, char *n)
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{
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for(; a; a=a->next)
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if(strcmp(a->name, n) == 0 && a->type != AttrQuery)
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return a;
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return nil;
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}
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void
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_freeattr(Attr *a)
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{
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Attr *anext;
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for(; a; a=anext){
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anext = a->next;
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free(a->name);
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free(a->val);
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a->name = (void*)~0;
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a->val = (void*)~0;
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a->next = (void*)~0;
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free(a);
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}
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}
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Attr*
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_mkattr(int type, char *name, char *val, Attr *next)
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{
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Attr *a;
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a = malloc(sizeof(*a));
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if(a==nil)
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sysfatal("_mkattr malloc: %r");
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a->type = type;
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a->name = strdup(name);
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a->val = strdup(val);
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if(a->name==nil || a->val==nil)
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sysfatal("_mkattr malloc: %r");
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a->next = next;
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setmalloctag(a, getcallerpc(&type));
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return a;
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}
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static Attr*
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cleanattr(Attr *a)
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{
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Attr *fa;
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Attr **la;
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for(la=&a; *la; ){
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if((*la)->type==AttrQuery && _findattr(a, (*la)->name)){
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fa = *la;
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*la = (*la)->next;
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fa->next = nil;
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_freeattr(fa);
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}else
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la=&(*la)->next;
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}
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return a;
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}
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Attr*
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_parseattr(char *s)
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{
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char *p, *t, *tok[256];
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int i, ntok, type;
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Attr *a;
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s = strdup(s);
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if(s == nil)
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sysfatal("_parseattr strdup: %r");
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ntok = tokenize(s, tok, nelem(tok));
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a = nil;
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for(i=ntok-1; i>=0; i--){
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t = tok[i];
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if(p = strchr(t, '=')){
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*p++ = '\0';
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// if(p-2 >= t && p[-2] == ':'){
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// p[-2] = '\0';
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// type = AttrDefault;
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// }else
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type = AttrNameval;
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a = _mkattr(type, t, p, a);
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setmalloctag(a, getcallerpc(&s));
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}
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else if(t[strlen(t)-1] == '?'){
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t[strlen(t)-1] = '\0';
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a = _mkattr(AttrQuery, t, "", a);
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setmalloctag(a, getcallerpc(&s));
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}else{
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/* really a syntax error, but better to provide some indication */
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a = _mkattr(AttrNameval, t, "", a);
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setmalloctag(a, getcallerpc(&s));
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}
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}
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free(s);
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return cleanattr(a);
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}
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char*
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_strfindattr(Attr *a, char *n)
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{
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a = _findattr(a, n);
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if(a == nil)
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return nil;
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return a->val;
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}
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