Merge branch 'rj/no-sign-compare' into maint

Many codepaths have been updated to squelch -Wsign-compare
warnings.

* rj/no-sign-compare:
  ALLOC_GROW: avoid -Wsign-compare warnings
  cache.h: hex2chr() - avoid -Wsign-compare warnings
  commit-slab.h: avoid -Wsign-compare warnings
  git-compat-util.h: xsize_t() - avoid -Wsign-compare warnings

Author: gitster

builtin/pack-objects.c

@@ -2562,8 +2562,8 @@ struct in_pack_object {
 };
 
 struct in_pack {
-	int alloc;
-	int nr;
+	unsigned int alloc;
+	unsigned int nr;
 	struct in_pack_object *array;
 };
 

cache.h

@@ -1264,8 +1264,8 @@ static inline unsigned int hexval(unsigned char c)
  */
 static inline int hex2chr(const char *s)
 {
-	int val = hexval(s[0]);
-	return (val < 0) ? val : (val << 4) | hexval(s[1]);
+	unsigned int val = hexval(s[0]);
+	return (val & ~0xf) ? val : (val << 4) | hexval(s[1]);
 }
 
 /* Convert to/from hex/sha1 representation */

commit-slab.h

@@ -78,7 +78,7 @@ static MAYBE_UNUSED void init_ ##slabname(struct slabname *s)		\
 									\
 static MAYBE_UNUSED void clear_ ##slabname(struct slabname *s)		\
 {									\
-	int i;								\
+	unsigned int i;							\
 	for (i = 0; i < s->slab_count; i++)				\
 		free(s->slab[i]);					\
 	s->slab_count = 0;						\
@@ -89,13 +89,13 @@ static MAYBE_UNUSED elemtype *slabname## _at_peek(struct slabname *s,	\
 						  const struct commit *c, \
 						  int add_if_missing)   \
 {									\
-	int nth_slab, nth_slot;						\
+	unsigned int nth_slab, nth_slot;				\
 									\
 	nth_slab = c->index / s->slab_size;				\
 	nth_slot = c->index % s->slab_size;				\
 									\
 	if (s->slab_count <= nth_slab) {				\
-		int i;							\
+		unsigned int i;						\
 		if (!add_if_missing)					\
 			return NULL;					\
 		REALLOC_ARRAY(s->slab, nth_slab + 1);			\

config.c

@@ -2155,7 +2155,7 @@ static struct {
 	size_t *offset;
 	unsigned int offset_alloc;
 	enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
-	int seen;
+	unsigned int seen;
 } store;
 
 static int matches(const char *key, const char *value)

diff.c

@@ -828,7 +828,7 @@ static void emit_rewrite_diff(const char *name_a,
 
 struct diff_words_buffer {
 	mmfile_t text;
-	long alloc;
+	unsigned long alloc;
 	struct diff_words_orig {
 		const char *begin, *end;
 	} *orig;

git-compat-util.h

@@ -900,9 +900,11 @@ static inline char *xstrdup_or_null(const char *str)
 
 static inline size_t xsize_t(off_t len)
 {
-	if (len > (size_t) len)
+	size_t size = (size_t) len;
+
+	if (len != (off_t) size)
 		die("Cannot handle files this big");
-	return (size_t)len;
+	return size;
 }
 
 __attribute__((format (printf, 3, 4)))

line-log.c

@@ -90,7 +90,7 @@ static int range_cmp(const void *_r, const void *_s)
  */
 static void range_set_check_invariants(struct range_set *rs)
 {
-	int i;
+	unsigned int i;
 
 	if (!rs)
 		return;
@@ -110,8 +110,8 @@ static void range_set_check_invariants(struct range_set *rs)
  */
 void sort_and_merge_range_set(struct range_set *rs)
 {
-	int i;
-	int o = 0; /* output cursor */
+	unsigned int i;
+	unsigned int o = 0; /* output cursor */
 
 	QSORT(rs->ranges, rs->nr, range_cmp);
 
@@ -144,7 +144,7 @@ void sort_and_merge_range_set(struct range_set *rs)
 static void range_set_union(struct range_set *out,
 			     struct range_set *a, struct range_set *b)
 {
-	int i = 0, j = 0;
+	unsigned int i = 0, j = 0;
 	struct range *ra = a->ranges;
 	struct range *rb = b->ranges;
 	/* cannot make an alias of out->ranges: it may change during grow */
@@ -186,7 +186,7 @@ static void range_set_union(struct range_set *out,
 static void range_set_difference(struct range_set *out,
 				  struct range_set *a, struct range_set *b)
 {
-	int i, j =  0;
+	unsigned int i, j =  0;
 	for (i = 0; i < a->nr; i++) {
 		long start = a->ranges[i].start;
 		long end = a->ranges[i].end;
@@ -397,7 +397,7 @@ static void diff_ranges_filter_touched(struct diff_ranges *out,
 				       struct diff_ranges *diff,
 				       struct range_set *rs)
 {
-	int i, j = 0;
+	unsigned int i, j = 0;
 
 	assert(out->target.nr == 0);
 
@@ -426,7 +426,7 @@ static void range_set_shift_diff(struct range_set *out,
 				 struct range_set *rs,
 				 struct diff_ranges *diff)
 {
-	int i, j = 0;
+	unsigned int i, j = 0;
 	long offset = 0;
 	struct range *src = rs->ranges;
 	struct range *target = diff->target.ranges;
@@ -873,7 +873,7 @@ static char *output_prefix(struct diff_options *opt)
 
 static void dump_diff_hacky_one(struct rev_info *rev, struct line_log_data *range)
 {
-	int i, j = 0;
+	unsigned int i, j = 0;
 	long p_lines, t_lines;
 	unsigned long *p_ends = NULL, *t_ends = NULL;
 	struct diff_filepair *pair = range->pair;
@@ -906,7 +906,7 @@ static void dump_diff_hacky_one(struct rev_info *rev, struct line_log_data *rang
 		long t_start = range->ranges.ranges[i].start;
 		long t_end = range->ranges.ranges[i].end;
 		long t_cur = t_start;
-		int j_last;
+		unsigned int j_last;
 
 		while (j < diff->target.nr && diff->target.ranges[j].end < t_start)
 			j++;

line-log.h

@@ -14,7 +14,7 @@ struct range {
 
 /* A set of ranges.  The ranges must always be disjoint and sorted. */
 struct range_set {
-	int alloc, nr;
+	unsigned int alloc, nr;
 	struct range *ranges;
 };
 

revision.c

@@ -1103,7 +1103,7 @@ static void add_rev_cmdline(struct rev_info *revs,
 			    unsigned flags)
 {
 	struct rev_cmdline_info *info = &revs->cmdline;
-	int nr = info->nr;
+	unsigned int nr = info->nr;
 
 	ALLOC_GROW(info->rev, nr + 1, info->alloc);
 	info->rev[nr].item = item;

tree-walk.c

@@ -581,12 +581,11 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 	int retval = MISSING_OBJECT;
 	struct dir_state *parents = NULL;
 	size_t parents_alloc = 0;
-	ssize_t parents_nr = 0;
+	size_t i, parents_nr = 0;
 	unsigned char current_tree_sha1[20];
 	struct strbuf namebuf = STRBUF_INIT;
 	struct tree_desc t;
 	int follows_remaining = GET_TREE_ENTRY_FOLLOW_SYMLINKS_MAX_LINKS;
-	int i;
 
 	init_tree_desc(&t, NULL, 0UL);
 	strbuf_addstr(&namebuf, name);