General const correctness fixes

We shouldn't attempt to assign constant strings into char*, as the
string is not writable at runtime.  Likewise we should always be
treating unsigned values as unsigned values, not as signed values.

Most of these are very straightforward.  The only exception is the
(unnecessary) xstrdup/free in builtin-branch.c for the detached
head case.  Since this is a user-level interactive type program
and that particular code path is executed no more than once, I feel
that the extra xstrdup call is well worth the easy elimination of
this warning.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 9 insertions, 12 deletions

diff --git a/commit.c b/commit.c
index 5552527342..5b9234e12e 100644
--- a/commit.c
+++ b/commit.c
@@ -651,7 +651,7 @@ static char *get_header(const struct commit *commit, const char *key)
 	}
 }
 
-static char *replace_encoding_header(char *buf, char *encoding)
+static char *replace_encoding_header(char *buf, const char *encoding)
 {
 	char *encoding_header = strstr(buf, "\nencoding ");
 	char *end_of_encoding_header;
@@ -694,29 +694,26 @@ static char *replace_encoding_header(char *buf, char *encoding)
 }
 
 static char *logmsg_reencode(const struct commit *commit,
-			     char *output_encoding)
+			     const char *output_encoding)
 {
+	static const char *utf8 = "utf-8";
+	const char *use_encoding;
 	char *encoding;
 	char *out;
-	char *utf8 = "utf-8";
 
 	if (!*output_encoding)
 		return NULL;
 	encoding = get_header(commit, "encoding");
-	if (!encoding)
-		encoding = utf8;
-	if (!strcmp(encoding, output_encoding))
+	use_encoding = encoding ? encoding : utf8;
+	if (!strcmp(use_encoding, output_encoding))
 		out = strdup(commit->buffer);
 	else
 		out = reencode_string(commit->buffer,
-				      output_encoding, encoding);
+				      output_encoding, use_encoding);
 	if (out)
 		out = replace_encoding_header(out, output_encoding);
 
-	if (encoding != utf8)
-		free(encoding);
-	if (!out)
-		return NULL;
+	free(encoding);
 	return out;
 }
 
@@ -917,7 +914,7 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt,
 	const char *msg = commit->buffer;
 	int plain_non_ascii = 0;
 	char *reencoded;
-	char *encoding;
+	const char *encoding;
 
 	if (fmt == CMIT_FMT_USERFORMAT)
 		return format_commit_message(commit, msg, buf, space);