ref: ed2752fe715680692023bbcaf85ddf03c2444c2c
dir: xmpp/xml.c
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "xml.h"
static char *escmap[] =
{
"\x06\""",
"\x06\''",
"\x04<<",
"\x04>>",
"\x05&&",
};
enum
{
Xmlvalue = 2,
};
static char*
unxml(char *orig)
{
char *s;
Rune r;
int i, n, rsz;
n = 0;
for(s = orig; *s != 0; s += rsz, n += rsz){
if(*s == '\r'){
if(s[1] == '\n'){
n--;
rsz = 1;
continue;
}
*s = '\n';
}
rsz = chartorune(&r, s);
memmove(orig+n, s, rsz);
if(*s == '&'){
for(i = 0; i < nelem(escmap); i++){
if(strncmp(s, &escmap[i][2], escmap[i][0]) == 0){
orig[n] = escmap[i][1];
s += escmap[i][0] - 1;
break;
}
}
}
}
orig[n] = 0;
return orig;
}
static void
xmlprint_(Xelem *x, int fd, int off)
{
Xattr *a;
for(; x != nil; x = x->next){
fprint(fd, "%*c%q", off, ' ', x->n);
if(x->v != nil)
fprint(fd, "=%q", x->v);
for(a = x->a; a != nil; a = a->next)
fprint(fd, " %q=%q", a->n, a->v);
fprint(fd, "\n");
off += 4;
xmlprint_(x->ch, fd, off);
off -= 4;
}
}
static Xattr*
xmlattr(char *s, int *err)
{
Xattr *a, *attrs;
char *p;
attrs = nil;
for(; *s;){
a = mallocz(sizeof(*a), 1);
a->n = s;
for(; *s && *s != '='; s++);
if(*s != '='){
werrstr("xml sucks (%d)", *s);
goto error;
}
*s++ = 0;
if(*s != '\'' && *s != '\"'){
werrstr("xml is complicated (%d)", *s);
goto error;
}
a->v = s+1;
s = utfrune(a->v, *s);
if(s == nil){
werrstr("xml is broken");
goto error;
}
*s++ = 0;
a->next = attrs;
a->n = unxml(a->n);
a->v = unxml(a->v);
attrs = a;
if(*s == ' ')
s++;
if((p = strchr(a->n, ':')) != nil && strncmp(p, ":zdef", 5) == 0)
*p = 0;
}
return attrs;
error:
*err = 1;
free(a);
for(; attrs != nil; attrs = a){
a = attrs->next;
free(attrs);
}
return nil;
}
static Xelem*
xmlread_(Biobufhdr *h, Xelem *par, int flags, int *err)
{
char *s, *t;
Xelem *x, *ch;
int r, closed, len;
x = nil;
for(;;){
r = Bgetrune(h);
if(r < 0){
werrstr("xmlread: %r");
goto error;
}
if(r == '<')
break;
if(isspacerune(r))
continue;
if(flags & Xmlvalue && par != nil){
Bungetrune(h);
if((s = Brdstr(h, '<', 1)) == nil){
werrstr("xmlread: %r");
goto error;
}
par->v = unxml(s);
if((s = Brdstr(h, '>', 1)) == nil){
free(par->v);
par->v = nil;
werrstr("xmlread: %r");
}
free(s);
return nil;
}
werrstr("xmlread: unexpected rune (%C)", r);
goto error;
}
s = Brdstr(h, '>', 1);
if(s == nil){
werrstr("xmlread: %r");
goto error;
}
if(s[0] == '/'){
free(s);
return nil;
}
if(s[0] == '?'){
free(s);
return xmlread_(h, par, flags, err);
}
x = mallocz(sizeof(*x), 1);
x->priv = s;
x->n = s;
if(strncmp(x->n, "zdef", 4) == 0){
if((x->n = strchr(x->n, ':')) == nil){
werrstr("xmlread: zdef without ':'");
goto error;
}
x->n += 1;
}
len = strlen(s);
if(s[len-1] == '/' || s[len-1] == '?'){
closed = 1;
s[len-1] = 0;
}else
closed = flags & Xmlstartonly;
for(; *s && *s != ' '; s++);
if(*s){
*s++ = 0;
x->a = xmlattr(s, err);
}
if(strcmp(x->n, "html") == 0){
for(len = 0;; len += r){
s = Brdstr(h, '>', 0);
if(s == nil){
werrstr("xmlread: %r");
goto error;
}
r = strlen(s);
x->v = realloc(x->v, len + r + 1);
if(x->v == nil){
werrstr("xmlread: %r");
goto error;
}
strcpy(x->v+len, s);
free(s);
t = strstr(x->v+len, "</html>");
if(t != nil){
*t = 0;
return x;
}
}
}
if(!closed){
for(;;){
flags = Xmlvalue;
ch = xmlread_(h, x, flags, err);
if(ch == nil)
break;
ch->next = x->ch;
x->ch = ch;
}
}
if(!*err)
return x;
error:
*err = 2;
xmlfree(x);
return nil;
}
Xelem*
xmlread(Biobuf *b, int flags, int *err)
{
*err = 0;
return xmlread_(b, nil, flags & Xmlstartonly, err);
}
void
xmlfree(Xelem *x)
{
Xattr *a, *ta;
Xelem *n, *n2;
if(x == nil)
return;
xmlfree(x->ch);
free(x->v);
x->ch = nil;
x->v = nil;
free(x->priv);
for(a = x->a; a != nil; a = ta){
ta = a->next;
free(a);
}
for(n = x->next; n != nil; n = n2){
n2 = n->next;
n->next = nil;
xmlfree(n);
}
free(x);
}
Xelem*
xmlget(Xelem *x, char *name)
{
for(; x != nil; x = x->next)
if(strcmp(x->n, name) == 0)
return x;
return nil;
}
Xattr*
xmlgetattr(Xattr *a, char *name)
{
for(; a != nil; a = a->next)
if(strcmp(a->n, name) == 0)
return a;
return nil;
}
void
xmlprint(Xelem *x, int fd)
{
xmlprint_(x, fd, 0);
}
int
xmlstrfmt(Fmt *f)
{
char *s, *orig, *new;
int i, sz, n;
orig = va_arg(f->args, char*);
for(s = orig; *s; s++){
for(i = 0; i < nelem(escmap); i++){
if(escmap[i][1] == *s)
goto escape;
}
}
return fmtprint(f, "%s", orig);
escape:
n = s-orig;
sz = n*2 + 1;
new = malloc(sz);
memcpy(new, orig, n);
for(; *s; s++, n++){
if(sz <= n+6){
sz = (n+6)*2;
new = realloc(new, sz);
}
new[n] = *s;
for(i = 0; i < nelem(escmap); i++){
if(escmap[i][1] == *s){
memcpy(new+n, &escmap[i][2], escmap[i][0]);
n += escmap[i][0] - 1;
break;
}
}
}
new[n] = 0;
n = fmtprint(f, "%s", new);
free(new);
return n;
}