Dump9660 (and mk9660). Until we either do something

intelligent with symlinks or put in a switch for things
like dump9660, this is of rather limited utility under Unix.

src/cmd/9660/conform.c

@@ -0,0 +1,141 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <libsec.h>
+#include <ctype.h>
+#include "iso9660.h"
+
+/*
+ * We keep an array sorted by bad atom pointer.
+ * The theory is that since we don't free memory very often,
+ * the array will be mostly sorted already and insertions will
+ * usually be near the end, so we won't spend much time
+ * keeping it sorted.
+ */
+
+/*
+ * Binary search a Tx list.
+ * If no entry is found, return a pointer to
+ * where a new such entry would go.
+ */
+static Tx*
+txsearch(char *atom, Tx *t, int n)
+{
+	while(n > 0) {
+		if(atom < t[n/2].bad)
+			n = n/2;
+		else if(atom > t[n/2].bad) {
+			t += n/2+1;
+			n -= (n/2+1);
+		} else
+			return &t[n/2];
+	}
+	return t;
+}
+
+void
+addtx(char *b, char *g)
+{
+	Tx *t;
+	Conform *c;
+
+	if(map == nil)
+		map = emalloc(sizeof(*map));
+	c = map;
+
+	if(c->nt%32 == 0)
+		c->t = erealloc(c->t, (c->nt+32)*sizeof(c->t[0]));
+	t = txsearch(b, c->t, c->nt);
+	if(t < c->t+c->nt && t->bad == b) {
+		fprint(2, "warning: duplicate entry for %s in _conform.map\n", b);
+		return;
+	}
+
+	if(t != c->t+c->nt)
+		memmove(t+1, t, (c->t+c->nt - t)*sizeof(Tx));
+	t->bad = b;
+	t->good = g;
+	c->nt++;
+}
+
+char*
+conform(char *s, int isdir)
+{
+	Tx *t;
+	char buf[10], *g;
+	Conform *c;
+
+	c = map;
+	s = atom(s);
+	if(c){
+		t = txsearch(s, c->t, c->nt);
+		if(t < c->t+c->nt && t->bad == s)
+			return t->good;
+	}
+
+	sprint(buf, "%c%.6d", isdir ? 'D' : 'F', c ? c->nt : 0);
+	g = atom(buf);
+	addtx(s, g);
+	return g;
+}
+
+#ifdef NOTUSED
+static int
+isalldigit(char *s)
+{
+	while(*s)
+		if(!isdigit(*s++))
+			return 0;
+	return 1;
+}
+#endif
+
+static int
+goodcmp(const void *va, const void *vb)
+{
+	Tx *a, *b;
+
+	a = (Tx*)va;
+	b = (Tx*)vb;
+	return strcmp(a->good, b->good);
+}
+
+static int
+badatomcmp(const void *va, const void *vb)
+{
+	Tx *a, *b;
+
+	a = (Tx*)va;
+	b = (Tx*)vb;
+	if(a->good < b->good)
+		return -1;
+	if(a->good > b->good)
+		return 1;
+	return 0;
+}
+
+void
+wrconform(Cdimg *cd, int n, ulong *pblock, ulong *plength)
+{
+	char buf[1024];
+	int i;
+	Conform *c;
+
+	c = map;
+	*pblock = cd->nextblock;
+	if(c==nil || n==c->nt){
+		*plength = 0;
+		return;
+	}
+
+	Cwseek(cd, cd->nextblock*Blocksize);
+	qsort(c->t, c->nt, sizeof(c->t[0]), goodcmp);
+	for(i=n; i<c->nt; i++) {
+		snprint(buf, sizeof buf, "%s %s\n", c->t[i].good, c->t[i].bad);
+		Cwrite(cd, buf, strlen(buf));
+	}
+	qsort(c->t, c->nt, sizeof(c->t[0]), badatomcmp);
+	*plength = Cwoffset(cd) - *pblock*Blocksize;
+	chat("write _conform.map at %lud+%lud\n", *pblock, *plength);
+	Cpadblock(cd);
+}