Merge branch 'ps/reftable-sign-compare'

The reftable/ library code has been made -Wsign-compare clean.

* ps/reftable-sign-compare:
  reftable: address trivial -Wsign-compare warnings
  reftable/blocksource: adjust `read_block()` to return `ssize_t`
  reftable/blocksource: adjust type of the block length
  reftable/block: adjust type of the restart length
  reftable/block: adapt header and footer size to return a `size_t`
  reftable/basics: adjust `hash_size()` to return `uint32_t`
  reftable/basics: adjust `common_prefix_size()` to return `size_t`
  reftable/record: handle overflows when decoding varints
  reftable/record: drop unused `print` function pointer
  meson: stop disabling -Wsign-compare

Author: gitster

meson.build

@@ -708,7 +708,6 @@ if get_option('warning_level') in ['2','3', 'everything'] and compiler.get_argum
     # These are disabled because we have these all over the place.
     '-Wno-empty-body',
     '-Wno-missing-field-initializers',
-    '-Wno-sign-compare',
   ]
     if compiler.has_argument(cflag)
       libgit_c_args += cflag

reftable/basics.c

@@ -263,18 +263,16 @@ int names_equal(const char **a, const char **b)
 	return a[i] == b[i];
 }
 
-int common_prefix_size(struct reftable_buf *a, struct reftable_buf *b)
+size_t common_prefix_size(struct reftable_buf *a, struct reftable_buf *b)
 {
-	int p = 0;
-	for (; p < a->len && p < b->len; p++) {
+	size_t p = 0;
+	for (; p < a->len && p < b->len; p++)
 		if (a->buf[p] != b->buf[p])
 			break;
-	}
-
 	return p;
 }
 
-int hash_size(enum reftable_hash id)
+uint32_t hash_size(enum reftable_hash id)
 {
 	if (!id)
 		return REFTABLE_HASH_SIZE_SHA1;

reftable/basics.h

@@ -169,9 +169,9 @@ static inline void *reftable_alloc_grow(void *p, size_t nelem, size_t elsize,
 #endif
 
 /* Find the longest shared prefix size of `a` and `b` */
-int common_prefix_size(struct reftable_buf *a, struct reftable_buf *b);
+size_t common_prefix_size(struct reftable_buf *a, struct reftable_buf *b);
 
-int hash_size(enum reftable_hash id);
+uint32_t hash_size(enum reftable_hash id);
 
 /*
  * Format IDs that identify the hash function used by a reftable. Note that

reftable/block.c

@@ -15,7 +15,7 @@ license that can be found in the LICENSE file or at
 #include "system.h"
 #include <zlib.h>
 
-int header_size(int version)
+size_t header_size(int version)
 {
 	switch (version) {
 	case 1:
@@ -26,7 +26,7 @@ int header_size(int version)
 	abort();
 }
 
-int footer_size(int version)
+size_t footer_size(int version)
 {
 	switch (version) {
 	case 1:
@@ -40,16 +40,15 @@ int footer_size(int version)
 static int block_writer_register_restart(struct block_writer *w, int n,
 					 int is_restart, struct reftable_buf *key)
 {
-	int rlen, err;
+	uint32_t rlen;
+	int err;
 
 	rlen = w->restart_len;
-	if (rlen >= MAX_RESTARTS) {
+	if (rlen >= MAX_RESTARTS)
 		is_restart = 0;
-	}
 
-	if (is_restart) {
+	if (is_restart)
 		rlen++;
-	}
 	if (2 + 3 * rlen + n > w->block_size - w->next)
 		return -1;
 	if (is_restart) {
@@ -72,7 +71,7 @@ static int block_writer_register_restart(struct block_writer *w, int n,
 }
 
 int block_writer_init(struct block_writer *bw, uint8_t typ, uint8_t *block,
-		      uint32_t block_size, uint32_t header_off, int hash_size)
+		      uint32_t block_size, uint32_t header_off, uint32_t hash_size)
 {
 	bw->block = block;
 	bw->hash_size = hash_size;
@@ -148,8 +147,7 @@ int block_writer_add(struct block_writer *w, struct reftable_record *rec)
 
 int block_writer_finish(struct block_writer *w)
 {
-	int i;
-	for (i = 0; i < w->restart_len; i++) {
+	for (uint32_t i = 0; i < w->restart_len; i++) {
 		put_be24(w->block + w->next, w->restarts[i]);
 		w->next += 3;
 	}
@@ -214,7 +212,7 @@ int block_writer_finish(struct block_writer *w)
 
 int block_reader_init(struct block_reader *br, struct reftable_block *block,
 		      uint32_t header_off, uint32_t table_block_size,
-		      int hash_size)
+		      uint32_t hash_size)
 {
 	uint32_t full_block_size = table_block_size;
 	uint8_t typ = block->data[header_off];

reftable/block.h

@@ -30,7 +30,7 @@ struct block_writer {
 
 	/* How often to restart keys. */
 	uint16_t restart_interval;
-	int hash_size;
+	uint32_t hash_size;
 
 	/* Offset of next uint8_t to write. */
 	uint32_t next;
@@ -48,7 +48,7 @@ struct block_writer {
  * initializes the blockwriter to write `typ` entries, using `block` as temporary
  * storage. `block` is not owned by the block_writer. */
 int block_writer_init(struct block_writer *bw, uint8_t typ, uint8_t *block,
-		      uint32_t block_size, uint32_t header_off, int hash_size);
+		      uint32_t block_size, uint32_t header_off, uint32_t hash_size);
 
 /* returns the block type (eg. 'r' for ref records. */
 uint8_t block_writer_type(struct block_writer *bw);
@@ -72,7 +72,7 @@ struct block_reader {
 
 	/* the memory block */
 	struct reftable_block block;
-	int hash_size;
+	uint32_t hash_size;
 
 	/* Uncompressed data for log entries. */
 	z_stream *zstream;
@@ -92,7 +92,7 @@ struct block_reader {
 /* initializes a block reader. */
 int block_reader_init(struct block_reader *br, struct reftable_block *bl,
 		      uint32_t header_off, uint32_t table_block_size,
-		      int hash_size);
+		      uint32_t hash_size);
 
 void block_reader_release(struct block_reader *br);
 
@@ -108,7 +108,7 @@ struct block_iter {
 	uint32_t next_off;
 	const unsigned char *block;
 	size_t block_len;
-	int hash_size;
+	uint32_t hash_size;
 
 	/* key for last entry we read. */
 	struct reftable_buf last_key;
@@ -137,10 +137,10 @@ void block_iter_reset(struct block_iter *it);
 void block_iter_close(struct block_iter *it);
 
 /* size of file header, depending on format version */
-int header_size(int version);
+size_t header_size(int version);
 
 /* size of file footer, depending on format version */
-int footer_size(int version);
+size_t footer_size(int version);
 
 /* returns a block to its source. */
 void reftable_block_done(struct reftable_block *ret);

reftable/blocksource.c

@@ -24,8 +24,8 @@ static void reftable_buf_close(void *b UNUSED)
 {
 }
 
-static int reftable_buf_read_block(void *v, struct reftable_block *dest,
-				   uint64_t off, uint32_t size)
+static ssize_t reftable_buf_read_block(void *v, struct reftable_block *dest,
+				       uint64_t off, uint32_t size)
 {
 	struct reftable_buf *b = v;
 	assert(off + size <= b->len);
@@ -78,8 +78,8 @@ static void file_close(void *v)
 	reftable_free(b);
 }
 
-static int file_read_block(void *v, struct reftable_block *dest, uint64_t off,
-			   uint32_t size)
+static ssize_t file_read_block(void *v, struct reftable_block *dest, uint64_t off,
+			       uint32_t size)
 {
 	struct file_block_source *b = v;
 	assert(off + size <= b->size);

reftable/reader.c

@@ -20,11 +20,11 @@ uint64_t block_source_size(struct reftable_block_source *source)
 	return source->ops->size(source->arg);
 }
 
-int block_source_read_block(struct reftable_block_source *source,
-			    struct reftable_block *dest, uint64_t off,
-			    uint32_t size)
+ssize_t block_source_read_block(struct reftable_block_source *source,
+				struct reftable_block *dest, uint64_t off,
+				uint32_t size)
 {
-	int result = source->ops->read_block(source->arg, dest, off, size);
+	ssize_t result = source->ops->read_block(source->arg, dest, off, size);
 	dest->source = *source;
 	return result;
 }
@@ -57,14 +57,17 @@ static int reader_get_block(struct reftable_reader *r,
 			    struct reftable_block *dest, uint64_t off,
 			    uint32_t sz)
 {
+	ssize_t bytes_read;
 	if (off >= r->size)
 		return 0;
-
-	if (off + sz > r->size) {
+	if (off + sz > r->size)
 		sz = r->size - off;
-	}
 
-	return block_source_read_block(&r->source, dest, off, sz);
+	bytes_read = block_source_read_block(&r->source, dest, off, sz);
+	if (bytes_read < 0)
+		return (int)bytes_read;
+
+	return 0;
 }
 
 enum reftable_hash reftable_reader_hash_id(struct reftable_reader *r)
@@ -601,6 +604,7 @@ int reftable_reader_new(struct reftable_reader **out,
 	struct reftable_reader *r;
 	uint64_t file_size = block_source_size(source);
 	uint32_t read_size;
+	ssize_t bytes_read;
 	int err;
 
 	REFTABLE_CALLOC_ARRAY(r, 1);
@@ -619,8 +623,8 @@ int reftable_reader_new(struct reftable_reader **out,
 		goto done;
 	}
 
-	err = block_source_read_block(source, &header, 0, read_size);
-	if (err != read_size) {
+	bytes_read = block_source_read_block(source, &header, 0, read_size);
+	if (bytes_read < 0 || (size_t)bytes_read != read_size) {
 		err = REFTABLE_IO_ERROR;
 		goto done;
 	}
@@ -645,9 +649,9 @@ int reftable_reader_new(struct reftable_reader **out,
 	r->hash_id = 0;
 	r->refcount = 1;
 
-	err = block_source_read_block(source, &footer, r->size,
-				      footer_size(r->version));
-	if (err != footer_size(r->version)) {
+	bytes_read = block_source_read_block(source, &footer, r->size,
+					     footer_size(r->version));
+	if (bytes_read < 0 || (size_t)bytes_read != footer_size(r->version)) {
 		err = REFTABLE_IO_ERROR;
 		goto done;
 	}
@@ -750,7 +754,7 @@ static int reftable_reader_refs_for_unindexed(struct reftable_reader *r,
 	struct table_iter *ti;
 	struct filtering_ref_iterator *filter = NULL;
 	struct filtering_ref_iterator empty = FILTERING_REF_ITERATOR_INIT;
-	int oid_len = hash_size(r->hash_id);
+	uint32_t oid_len = hash_size(r->hash_id);
 	int err;
 
 	REFTABLE_ALLOC_ARRAY(ti, 1);

reftable/reader.h

@@ -16,9 +16,9 @@ license that can be found in the LICENSE file or at
 
 uint64_t block_source_size(struct reftable_block_source *source);
 
-int block_source_read_block(struct reftable_block_source *source,
-			    struct reftable_block *dest, uint64_t off,
-			    uint32_t size);
+ssize_t block_source_read_block(struct reftable_block_source *source,
+				struct reftable_block *dest, uint64_t off,
+				uint32_t size);
 void block_source_close(struct reftable_block_source *source);
 
 /* metadata for a block type */