[PATCH v3 03/12] bisect--helper: introduce new `write_in_file()` function

[Miriam Rubio <mirucam@gmail.com>]

Let's refactor code adding a new `write_in_file()` function
that opens a file for writing a message and closes it.

This helper will be used in later steps and makes the code
simpler and easier to understand.

Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Miriam Rubio <mirucam@gmail.com>
---
 builtin/bisect--helper.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 0fbd924aac..d3b2b33df0 100644
--- a/builtin/bisect--helper.c
+++ b/builtin/bisect--helper.c
@@ -74,6 +74,28 @@ static int one_of(const char *term, ...)
 	return res;
 }
 
+static int write_in_file(const char *path, const char *mode, const char *format,...)
+{
+	FILE *fp = NULL;
+	va_list args;
+	int res = 0;
+
+	if (!strcmp(mode, "a") && !strcmp(mode, "w"))
+		return error(_("wrong writing mode '%s'"), mode);
+	fp = fopen(path, mode);
+	if (!fp)
+		return error_errno(_("cannot open file '%s' in mode '%s'"), path, mode);
+	va_start(args, format);
+	res = vfprintf(fp, format, args);
+	va_end(args);
+	if (!res) {
+		fclose(fp);
+		return error_errno(_("could not write to file '%s'"), path);
+	}
+
+	return fclose(fp);
+}
+
 static int check_term_format(const char *term, const char *orig_term)
 {
 	int res;
@@ -104,7 +126,6 @@ static int check_term_format(const char *term, const char *orig_term)
 
 static int write_terms(const char *bad, const char *good)
 {
-	FILE *fp = NULL;
 	int res;
 
 	if (!strcmp(bad, good))
@@ -113,12 +134,8 @@ static int write_terms(const char *bad, const char *good)
 	if (check_term_format(bad, "bad") || check_term_format(good, "good"))
 		return -1;
 
-	fp = fopen(git_path_bisect_terms(), "w");
-	if (!fp)
-		return error_errno(_("could not open the file BISECT_TERMS"));
+	res = write_in_file(git_path_bisect_terms(), "w", "%s\n%s\n", bad, good);
 
-	res = fprintf(fp, "%s\n%s\n", bad, good);
-	res |= fclose(fp);
 	return (res < 0) ? -1 : 0;
 }
 
-- 
2.25.0