[PATCH i18n 01/11] Add three convenient format printing functions with \n automatically appended

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

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"));
---
 strbuf.c |   33 +++++++++++++++++++++++++++++++++
 strbuf.h |    7 +++++++
 2 files changed, 40 insertions(+), 0 deletions(-)

diff --git a/strbuf.c b/strbuf.c
index 5135d59..9fbc75c 100644
--- a/strbuf.c
+++ b/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)
+		ret += printf("\n");
+	return ret;
+}
+
+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)
+		ret += fprintf(fp, "\n");
+	return ret;
+}
diff --git a/strbuf.h b/strbuf.h
index 3effaa8..b888d40 100644
--- a/strbuf.h
+++ b/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 */
-- 
1.7.3.1.256.g2539c.dirty