Include <limits.h> in commit.c for ULONG_MAX. Remove old "revision.h".

The old revision.h helper header isn't used any more, but I never noticed
it until I started grepping for ULONG_MAX users.

commit.c

@@ -1,6 +1,7 @@
 #include "commit.h"
 #include "cache.h"
 #include <string.h>
+#include <limits.h>
 
 const char *commit_type = "commit";
 

revision.h

@@ -1,164 +0,0 @@
-#ifndef REVISION_H
-#define REVISION_H
-
-/*
- * The low 16 bits of the "flags" field shows whether
- * a commit is part of the path to the root for that
- * parent.
- *
- * Bit 16 is an internal flag that we've seen the
- * definition for this rev, and not just seen it as
- * a parent target.
- */
-#define marked(rev)	((rev)->flags & 0xffff)
-#define SEEN 0x10000
-#define USED 0x20000
-#define REACHABLE 0x40000
-
-struct parent {
-	struct revision *parent;
-	struct parent *next;
-};
-
-struct revision {
-	unsigned int flags;
-	unsigned char sha1[20];
-	unsigned long date;
-	struct parent *parent;
-	char tag[1];
-};
-
-static struct revision **revs;
-static int nr_revs, rev_allocs;
-
-static int find_rev(unsigned char *sha1)
-{
-	int first = 0, last = nr_revs;
-
-	while (first < last) {
-		int next = (first + last) / 2;
-		struct revision *rev = revs[next];
-		int cmp;
-
-		cmp = memcmp(sha1, rev->sha1, 20);
-		if (!cmp)
-			return next;
-		if (cmp < 0) {
-			last = next;
-			continue;
-		}
-		first = next+1;
-	}
-	return -first-1;
-}
-
-static struct revision *lookup_rev(unsigned char *sha1, const char *tag)
-{
-	int pos = find_rev(sha1);
-	struct revision *n;
-
-	if (pos >= 0) {
-		n = revs[pos];
-		if (strcmp(n->tag, tag))
-			error("expected tag %s on object %s: got %s", tag, sha1_to_hex(sha1), n->tag);
-		return n;
-	}
-	
-	pos = -pos-1;
-
-	if (rev_allocs == nr_revs) {
-		rev_allocs = alloc_nr(rev_allocs);
-		revs = realloc(revs, rev_allocs * sizeof(struct revision *));
-	}
-	n = malloc(sizeof(struct revision) + strlen(tag));
-
-	n->flags = 0;
-	memcpy(n->sha1, sha1, 20);
-	n->parent = NULL;
-	strcpy(n->tag, tag);
-
-	/* Insert it into the right place */
-	memmove(revs + pos + 1, revs + pos, (nr_revs - pos) * sizeof(struct revision *));
-	revs[pos] = n;
-	nr_revs++;
-
-	return n;
-}
-
-static struct revision *add_relationship(struct revision *rev, unsigned char *needs, const char *tag)
-{
-	struct revision *parent_rev = lookup_rev(needs, tag);
-	struct parent **pp = &rev->parent, *p;
-
-	while ((p = *pp) != NULL) {
-		if (p->parent == parent_rev)
-			return parent_rev;
-		pp = &p->next;
-	}
-
-	p = malloc(sizeof(*p));
-	p->parent = parent_rev;
-	p->next = NULL;
-	*pp = p;
-	return parent_rev;
-}
-
-static void mark_reachable(struct revision *rev, unsigned int mask)
-{
-	struct parent *p = rev->parent;
-
-	/* If we've been here already, don't bother */
-	if (rev->flags & mask)
-		return;
-	rev->flags |= mask | USED;
-	while (p) {
-		mark_reachable(p->parent, mask);
-		p = p->next;
-	}
-}
-
-static unsigned long parse_commit_date(const char *buf)
-{
-	unsigned long date;
-
-	if (memcmp(buf, "author", 6))
-		return 0;
-	while (*buf++ != '\n')
-		/* nada */;
-	if (memcmp(buf, "committer", 9))
-		return 0;
-	while (*buf++ != '>')
-		/* nada */;
-	date = strtoul(buf, NULL, 10);
-	if (date == ULONG_MAX)
-		date = 0;
-	return date;
-}
-
-static struct revision * parse_commit(unsigned char *sha1)
-{
-	struct revision *rev = lookup_rev(sha1, "commit");
-
-	if (!(rev->flags & SEEN)) {
-		void *buffer, *bufptr;
-		unsigned long size;
-		char type[20];
-		unsigned char parent[20];
-
-		rev->flags |= SEEN;
-		buffer = bufptr = read_sha1_file(sha1, type, &size);
-		if (!buffer || strcmp(type, "commit"))
-			die("%s is not a commit object", sha1_to_hex(sha1));
-		bufptr += 46; /* "tree " + "hex sha1" + "\n" */
-		while (!memcmp(bufptr, "parent ", 7) && !get_sha1_hex(bufptr+7, parent)) {
-			add_relationship(rev, parent, "commit");
-			parse_commit(parent);
-			bufptr += 48;	/* "parent " + "hex sha1" + "\n" */
-		}
-		rev->date = parse_commit_date(bufptr);
-		free(buffer);
-	}
-	return rev;
-}
-
-#endif /* REVISION_H */