strbuf: convenience format functions with \n automatically appended

These functions are helpful when we do not want to expose \n to
translators. For example

    printf("hello world\n");

can be converted to

    printf_ln(_("hello world"));

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

strbuf.c

@@ -464,3 +464,36 @@ void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
 {
 	strbuf_add_urlencode(sb, s, strlen(s), reserved);
 }
+
+void strbuf_addf_ln(struct strbuf *sb, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	strbuf_vaddf(sb, fmt, ap);
+	va_end(ap);
+	strbuf_addch(sb, '\n');
+}
+
+int printf_ln(const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vprintf(fmt, ap);
+	va_end(ap);
+	if (ret < 0 || putchar('\n') == EOF)
+		return -1;
+	return ret + 1;
+}
+
+int fprintf_ln(FILE *fp, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vfprintf(fp, fmt, ap);
+	va_end(ap);
+	if (ret < 0 || putc('\n', fp) == EOF)
+		return -1;
+	return ret + 1;
+}

strbuf.h

@@ -99,6 +99,8 @@ __attribute__((format (printf,2,3)))
 extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
 __attribute__((format (printf,2,0)))
 extern void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap);
+__attribute__((format (printf,2,3)))
+extern void strbuf_addf_ln(struct strbuf *sb, const char *fmt, ...);
 
 extern void strbuf_add_lines(struct strbuf *sb, const char *prefix, const char *buf, size_t size);
 
@@ -129,4 +131,9 @@ extern void strbuf_add_urlencode(struct strbuf *, const char *, size_t,
 extern void strbuf_addstr_urlencode(struct strbuf *, const char *,
 				    int reserved);
 
+__attribute__((format (printf,1,2)))
+extern int printf_ln(const char *fmt, ...);
+__attribute__((format (printf,2,3)))
+extern int fprintf_ln(FILE *fp, const char *fmt, ...);
+
 #endif /* STRBUF_H */