Merge branch 'maint-1.5.1' into maint

* maint-1.5.1:
  git-config: Improve documentation of git-config file handling
  git-config: Various small fixes to asciidoc documentation
  decode_85(): fix missing return.
  fix signed range problems with hex conversions

Documentation/git-config.txt

@@ -31,7 +31,7 @@ If you want to update or unset an option which can occur on multiple
 lines, a POSIX regexp `value_regex` needs to be given.  Only the
 existing values that match the regexp are updated or unset.  If
 you want to handle the lines that do *not* match the regex, just
-prepend a single exclamation mark in front (see EXAMPLES).
+prepend a single exclamation mark in front (see also <<EXAMPLES>>).
 
 The type specifier can be either '--int' or '--bool', which will make
 'git-config' ensure that the variable(s) are of the given type and
@@ -48,7 +48,7 @@ This command will fail if:
 . the section or key is invalid,
 . you try to unset an option which does not exist,
 . you try to unset/set an option for which multiple lines match, or
-. you use --global option without $HOME being properly set.
+. you use '--global' option without $HOME being properly set.
 
 
 OPTIONS
@@ -75,11 +75,22 @@ OPTIONS
 	Like --get-all, but interprets the name as a regular expression.
 
 --global::
-	Use global ~/.gitconfig file rather than the repository .git/config.
+	For writing options: write to global ~/.gitconfig file rather than
+	the repository .git/config.
++
+For reading options: read only from global ~/.gitconfig rather than
+from all available files.
++
+See also <<FILES>>.
 
 --system::
-	Use system-wide $(prefix)/etc/gitconfig rather than the repository
-	.git/config.
+	For writing options: write to system-wide $(prefix)/etc/gitconfig
+	rather than the repository .git/config.
++
+For reading options: read only from system-wide $(prefix)/etc/gitconfig
+rather than from all available files.
++
+See also <<FILES>>.
 
 --remove-section::
 	Remove the given section from the configuration file.
@@ -106,21 +117,64 @@ OPTIONS
 	by 1024, 1048576, or 1073741824 prior to output.
 
 
+[[FILES]]
+FILES
+-----
+
+There are three files where git-config will search for configuration
+options:
+
+.git/config::
+	Repository specific configuration file. (The filename is
+	of course relative to the repository root, not the working
+	directory.)
+
+~/.gitconfig::
+	User-specific configuration file. Also called "global"
+	configuration file.
+
+$(prefix)/etc/gitconfig::
+	System-wide configuration file.
+
+If no further options are given, all reading options will read all of these
+files that are available. If the global or the system-wide configuration
+file are not available they will be ignored. If the repository configuration
+file is not available or readable, git-config will exit with a non-zero
+error code. However, in neither case will an error message be issued.
+
+All writing options will per default write to the repository specific
+configuration file. Note that this also affects options like '--replace-all'
+and '--unset'. *git-config will only ever change one file at a time*.
+
+You can override these rules either by command line options or by environment
+variables. The '--global' and the '--system' options will limit the file used
+to the global or system-wide file respectively. The GIT_CONFIG environment
+variable has a similar effect, but you can specify any filename you want.
+
+The GIT_CONFIG_LOCAL environment variable on the other hand only changes
+the name used instead of the repository configuration file. The global and
+the system-wide configuration files will still be read. (For writing options
+this will obviously result in the same behavior as using GIT_CONFIG.)
+
+
 ENVIRONMENT
 -----------
 
 GIT_CONFIG::
 	Take the configuration from the given file instead of .git/config.
-	Using the "--global" option forces this to ~/.gitconfig.
+	Using the "--global" option forces this to ~/.gitconfig. Using the
+	"--system" option forces this to $(prefix)/etc/gitconfig.
 
 GIT_CONFIG_LOCAL::
-	Currently the same as $GIT_CONFIG; when Git will support global
-	configuration files, this will cause it to take the configuration
-	from the global configuration file in addition to the given file.
+	Take the configuration from the given file instead if .git/config.
+	Still read the global and the system-wide configuration files, though.
+
+See also <<FILES>>.
 
 
-EXAMPLE
--------
+[[EXAMPLES]]
+EXAMPLES
+--------
 
 Given a .git/config like this:
 

base85.c

@@ -66,7 +66,7 @@ int decode_85(char *dst, const char *buffer, int len)
 		 */
 		if (0x03030303 < acc ||
 		    0xffffffff - de < (acc *= 85))
-			error("invalid base85 sequence %.5s", buffer-5);
+			return error("invalid base85 sequence %.5s", buffer-5);
 		acc += de;
 		say1(" %08x", acc);
 

cache.h

@@ -359,8 +359,8 @@ extern int legacy_loose_object(unsigned char *);
 extern int has_pack_file(const unsigned char *sha1);
 extern int has_pack_index(const unsigned char *sha1);
 
-extern signed char hexval_table[256];
-static inline unsigned int hexval(unsigned int c)
+extern const signed char hexval_table[256];
+static inline unsigned int hexval(unsigned char c)
 {
 	return hexval_table[c];
 }

sha1_file.c

@@ -33,7 +33,7 @@ const unsigned char null_sha1[20];
 
 static unsigned int sha1_file_open_flag = O_NOATIME;
 
-signed char hexval_table[256] = {
+const signed char hexval_table[256] = {
 	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 00-07 */
 	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 08-0f */
 	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 10-17 */