color: add color_set helper for copying raw colors

To set up default colors, we sometimes strcpy() from the
default string literals into our color buffers. This isn't a
bug (assuming the destination is COLOR_MAXLEN bytes), but
makes it harder to audit the code for problematic strcpy
calls.

Let's introduce a color_set which copies under the
assumption that there are COLOR_MAXLEN bytes in the
destination (of course you can call it on a smaller buffer,
so this isn't providing a huge amount of safety, but it's
more convenient than calling xsnprintf yourself).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 16 insertions, 16 deletions

diff --git a/grep.c b/grep.c
index 6c68d5bd2e..7b2b96a437 100644
--- a/grep.c
+++ b/grep.c
@@ -31,14 +31,14 @@ void init_grep_defaults(void)
 	opt->max_depth = -1;
 	opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
 	opt->extended_regexp_option = 0;
-	strcpy(opt->color_context, "");
-	strcpy(opt->color_filename, "");
-	strcpy(opt->color_function, "");
-	strcpy(opt->color_lineno, "");
-	strcpy(opt->color_match_context, GIT_COLOR_BOLD_RED);
-	strcpy(opt->color_match_selected, GIT_COLOR_BOLD_RED);
-	strcpy(opt->color_selected, "");
-	strcpy(opt->color_sep, GIT_COLOR_CYAN);
+	color_set(opt->color_context, "");
+	color_set(opt->color_filename, "");
+	color_set(opt->color_function, "");
+	color_set(opt->color_lineno, "");
+	color_set(opt->color_match_context, GIT_COLOR_BOLD_RED);
+	color_set(opt->color_match_selected, GIT_COLOR_BOLD_RED);
+	color_set(opt->color_selected, "");
+	color_set(opt->color_sep, GIT_COLOR_CYAN);
 	opt->color = -1;
 }
 
@@ -151,14 +151,14 @@ void grep_init(struct grep_opt *opt, const char *prefix)
 	opt->regflags = def->regflags;
 	opt->relative = def->relative;
 
-	strcpy(opt->color_context, def->color_context);
-	strcpy(opt->color_filename, def->color_filename);
-	strcpy(opt->color_function, def->color_function);
-	strcpy(opt->color_lineno, def->color_lineno);
-	strcpy(opt->color_match_context, def->color_match_context);
-	strcpy(opt->color_match_selected, def->color_match_selected);
-	strcpy(opt->color_selected, def->color_selected);
-	strcpy(opt->color_sep, def->color_sep);
+	color_set(opt->color_context, def->color_context);
+	color_set(opt->color_filename, def->color_filename);
+	color_set(opt->color_function, def->color_function);
+	color_set(opt->color_lineno, def->color_lineno);
+	color_set(opt->color_match_context, def->color_match_context);
+	color_set(opt->color_match_selected, def->color_match_selected);
+	color_set(opt->color_selected, def->color_selected);
+	color_set(opt->color_sep, def->color_sep);
 }
 
 void grep_commit_pattern_type(enum grep_pattern_type pattern_type, struct grep_opt *opt)