Introduce ALPM_BUFFER_SIZE constant

This takes the place of three previously used constants:
ARCHIVE_DEFAULT_BYTES_PER_BLOCK, BUFFER_SIZE, and CPBUFSIZE.

In libarchive 3.0, the first constant will be no more, so we can ensure
we are forward-compatible by removing our usage of it now. The rest are
unified for consistency.

By default, we will use the value of BUFSIZ provided by <stdio.h>, which
is 8192 on Linux. If that is undefined, a default value is provided.

Signed-off-by: Dan McGee <dan@archlinux.org>

lib/libalpm/add.c

@@ -456,6 +456,7 @@ static int commit_single_pkg(alpm_handle_t *handle, alpm_pkg_t *newpkg,
 	alpm_pkg_t *oldpkg = NULL;
 	alpm_db_t *db = handle->db_local;
 	alpm_trans_t *trans = handle->trans;
+	const char *pkgfile;
 
 	ASSERT(trans != NULL, return -1);
 
@@ -479,13 +480,15 @@ static int commit_single_pkg(alpm_handle_t *handle, alpm_pkg_t *newpkg,
 		EVENT(handle, ALPM_EVENT_ADD_START, newpkg, NULL);
 	}
 
+	pkgfile = newpkg->origin_data.file;
+
 	_alpm_log(handle, ALPM_LOG_DEBUG, "%s package %s-%s\n",
 			is_upgrade ? "upgrading" : "adding", newpkg->name, newpkg->version);
 		/* pre_install/pre_upgrade scriptlet */
 	if(alpm_pkg_has_scriptlet(newpkg) &&
 			!(trans->flags & ALPM_TRANS_FLAG_NOSCRIPTLET)) {
 		const char *scriptlet_name = is_upgrade ? "pre_upgrade" : "pre_install";
-		_alpm_runscriptlet(handle, newpkg->origin_data.file,
+		_alpm_runscriptlet(handle, pkgfile,
 				scriptlet_name, newpkg->version, NULL, 1);
 	}
 
@@ -531,9 +534,9 @@ static int commit_single_pkg(alpm_handle_t *handle, alpm_pkg_t *newpkg,
 		archive_read_support_compression_all(archive);
 		archive_read_support_format_all(archive);
 
-		_alpm_log(handle, ALPM_LOG_DEBUG, "archive: %s\n", newpkg->origin_data.file);
-		if(archive_read_open_filename(archive, newpkg->origin_data.file,
-					ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
+		_alpm_log(handle, ALPM_LOG_DEBUG, "archive: %s\n", pkgfile);
+		if(archive_read_open_filename(archive, pkgfile,
+					ALPM_BUFFER_SIZE) != ARCHIVE_OK) {
 			handle->pm_errno = ALPM_ERR_PKG_OPEN;
 			ret = -1;
 			goto cleanup;

lib/libalpm/be_package.c

@@ -59,7 +59,7 @@ static void *_package_changelog_open(alpm_pkg_t *pkg)
 	archive_read_support_format_all(archive);
 
 	if(archive_read_open_filename(archive, pkgfile,
-				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
+				ALPM_BUFFER_SIZE) != ARCHIVE_OK) {
 		RET_ERR(pkg->handle, ALPM_ERR_PKG_OPEN, NULL);
 	}
 
@@ -390,7 +390,7 @@ alpm_pkg_t *_alpm_pkg_load_internal(alpm_handle_t *handle,
 	archive_read_support_format_all(archive);
 
 	if(archive_read_open_filename(archive, pkgfile,
-				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
+				ALPM_BUFFER_SIZE) != ARCHIVE_OK) {
 		alpm_pkg_free(newpkg);
 		RET_ERR(handle, ALPM_ERR_PKG_OPEN, NULL);
 	}

lib/libalpm/be_sync.c

@@ -440,7 +440,7 @@ static int sync_db_populate(alpm_db_t *db)
 	_alpm_log(db->handle, ALPM_LOG_DEBUG, "opening database archive %s\n", dbpath);
 
 	if(archive_read_open_filename(archive, dbpath,
-				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
+				ALPM_BUFFER_SIZE) != ARCHIVE_OK) {
 		_alpm_log(db->handle, ALPM_LOG_ERROR, _("could not open file %s: %s\n"), dbpath,
 				archive_error_string(archive));
 		archive_read_finish(archive);

lib/libalpm/util.c

@@ -129,8 +129,6 @@ int _alpm_makepath_mode(const char *path, mode_t mode)
 	return ret;
 }
 
-#define CPBUFSIZE 8 * 1024
-
 int _alpm_copyfile(const char *src, const char *dest)
 {
 	FILE *in, *out;
@@ -148,10 +146,10 @@ int _alpm_copyfile(const char *src, const char *dest)
 		return 1;
 	}
 
-	CALLOC(buf, (size_t)CPBUFSIZE, (size_t)1, ret = 1; goto cleanup;);
+	MALLOC(buf, (size_t)ALPM_BUFFER_SIZE, ret = 1; goto cleanup);
 
 	/* do the actual file copy */
-	while((len = fread(buf, 1, CPBUFSIZE, in))) {
+	while((len = fread(buf, 1, ALPM_BUFFER_SIZE, in))) {
 		size_t nwritten = 0;
 		nwritten = fwrite(buf, 1, len, out);
 		if((nwritten != len) || ferror(out)) {
@@ -174,7 +172,7 @@ int _alpm_copyfile(const char *src, const char *dest)
 cleanup:
 	fclose(in);
 	fclose(out);
-	FREE(buf);
+	free(buf);
 	return ret;
 }
 
@@ -288,7 +286,7 @@ int _alpm_unpack(alpm_handle_t *handle, const char *archive, const char *prefix,
 	archive_read_support_format_all(_archive);
 
 	if(archive_read_open_filename(_archive, archive,
-				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
+				ALPM_BUFFER_SIZE) != ARCHIVE_OK) {
 		_alpm_log(handle, ALPM_LOG_ERROR, _("could not open file %s: %s\n"), archive,
 				archive_error_string(_archive));
 		RET_ERR(handle, ALPM_ERR_PKG_OPEN, 1);
@@ -741,8 +739,6 @@ int _alpm_lstat(const char *path, struct stat *buf)
 }
 
 #ifdef HAVE_LIBSSL
-#define BUFFER_SIZE 8192
-
 static int md5_file(const char *path, unsigned char output[16])
 {
 	FILE *f;
@@ -750,7 +746,7 @@ static int md5_file(const char *path, unsigned char output[16])
 	MD5_CTX ctx;
 	unsigned char *buf;
 
-	CALLOC(buf, BUFFER_SIZE, sizeof(unsigned char), return 1);
+	CALLOC(buf, ALPM_BUFFER_SIZE, sizeof(unsigned char), return 1);
 
 	if((f = fopen(path, "rb")) == NULL) {
 		free(buf);
@@ -759,7 +755,7 @@ static int md5_file(const char *path, unsigned char output[16])
 
 	MD5_Init(&ctx);
 
-	while((n = fread(buf, 1, BUFFER_SIZE, f)) > 0) {
+	while((n = fread(buf, 1, ALPM_BUFFER_SIZE, f)) > 0) {
 		MD5_Update(&ctx, buf, n);
 	}
 
@@ -785,7 +781,7 @@ static int sha2_file(const char *path, unsigned char output[32], int is224)
 	SHA256_CTX ctx;
 	unsigned char *buf;
 
-	CALLOC(buf, BUFFER_SIZE, sizeof(unsigned char), return 1);
+	CALLOC(buf, ALPM_BUFFER_SIZE, sizeof(unsigned char), return 1);
 
 	if((f = fopen(path, "rb")) == NULL) {
 		free(buf);
@@ -798,7 +794,7 @@ static int sha2_file(const char *path, unsigned char output[32], int is224)
 		SHA256_Init(&ctx);
 	}
 
-	while((n = fread(buf, 1, BUFFER_SIZE, f)) > 0) {
+	while((n = fread(buf, 1, ALPM_BUFFER_SIZE, f)) > 0) {
 		if(is224) {
 			SHA224_Update(&ctx, buf, n);
 		} else {

lib/libalpm/util.h

@@ -75,6 +75,13 @@
 
 #define CHECK_HANDLE(handle, action) do { if(!(handle)) { action; } (handle)->pm_errno = 0; } while(0)
 
+/** Standard buffer size used throughout the library. */
+#ifdef BUFSIZ
+#define ALPM_BUFFER_SIZE BUFSIZ
+#else
+#define ALPM_BUFFER_SIZE 8192
+#endif
+
 /**
  * Used as a buffer/state holder for _alpm_archive_fgets().
  */