Import version of libhtml that might actually work with ANSI C.

src/cmd/htmlfmt/util.c

@@ -0,0 +1,120 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <draw.h>
+#include <html.h>
+#include "dat.h"
+
+void*
+emalloc(ulong n)
+{
+	void *p;
+
+	p = malloc(n);
+	if(p == nil)
+		error("can't malloc: %r");
+	memset(p, 0, n);
+	return p;
+}
+
+void*
+erealloc(void *p, ulong n)
+{
+	p = realloc(p, n);
+	if(p == nil)
+		error("can't malloc: %r");
+	return p;
+}
+
+char*
+estrdup(char *s)
+{
+	char *t;
+
+	t = emalloc(strlen(s)+1);
+	strcpy(t, s);
+	return t;
+}
+
+char*
+estrstrdup(char *s, char *t)
+{
+	long ns, nt;
+	char *u;
+
+	ns = strlen(s);
+	nt = strlen(t);
+	/* use malloc to avoid memset */
+	u = malloc(ns+nt+1);
+	if(u == nil)
+		error("can't malloc: %r");
+	memmove(u, s, ns);
+	memmove(u+ns, t, nt);
+	u[ns+nt] = '\0';
+	return u;
+}
+
+char*
+eappend(char *s, char *sep, char *t)
+{
+	long ns, nsep, nt;
+	char *u;
+
+	if(t == nil)
+		u = estrstrdup(s, sep);
+	else{
+		ns = strlen(s);
+		nsep = strlen(sep);
+		nt = strlen(t);
+		/* use malloc to avoid memset */
+		u = malloc(ns+nsep+nt+1);
+		if(u == nil)
+			error("can't malloc: %r");
+		memmove(u, s, ns);
+		memmove(u+ns, sep, nsep);
+		memmove(u+ns+nsep, t, nt);
+		u[ns+nsep+nt] = '\0';
+	}
+	free(s);
+	return u;
+}
+
+char*
+egrow(char *s, char *sep, char *t)
+{
+	s = eappend(s, sep, t);
+	free(t);
+	return s;
+}
+
+void
+error(char *fmt, ...)
+{
+	va_list arg;
+	char buf[256];
+	Fmt f;
+
+	fmtfdinit(&f, 2, buf, sizeof buf);
+	fmtprint(&f, "Mail: ");
+	va_start(arg, fmt);
+	fmtvprint(&f, fmt, arg);
+	va_end(arg);
+	fmtprint(&f, "\n");
+	fmtfdflush(&f);
+	exits(fmt);
+}
+
+void
+growbytes(Bytes *b, char *s, long ns)
+{
+	if(b->nalloc < b->n + ns + 1){
+		b->nalloc = b->n + ns + 8000;
+		/* use realloc to avoid memset */
+		b->b = realloc(b->b, b->nalloc);
+		if(b->b == nil)
+			error("growbytes: can't realloc: %r");
+	}
+	memmove(b->b+b->n, s, ns);
+	b->n += ns;
+	b->b[b->n] = '\0';
+}