[PATCH v7 01/11] make lineno_width() from blame reusable for others

["Zbigniew Jędrzejewski-Szmek" <zbyszek@in.waw.pl>]

builtin/blame.c has a helper function to compute how many columns we
need to show a line-number, whose implementation is reusable as a more
generic helper function to count the number of columns necessary to
show any cardinal number.

Rename it to decimal_width(), move it to pager.c and export it for use
by future callers.

Signed-off-by: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
---
 builtin/blame.c | 18 +++---------------
 cache.h         |  1 +
 pager.c         | 13 +++++++++++++
 3 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/builtin/blame.c b/builtin/blame.c
index 01956c8..b35bd62 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -1829,18 +1829,6 @@ static int read_ancestry(const char *graft_file)
 }
 
 /*
- * How many columns do we need to show line numbers in decimal?
- */
-static int lineno_width(int lines)
-{
-	int i, width;
-
-	for (width = 1, i = 10; i <= lines; width++)
-		i *= 10;
-	return width;
-}
-
-/*
  * How many columns do we need to show line numbers, authors,
  * and filenames?
  */
@@ -1880,9 +1868,9 @@ static void find_alignment(struct scoreboard *sb, int *option)
 		if (largest_score < ent_score(sb, e))
 			largest_score = ent_score(sb, e);
 	}
-	max_orig_digits = lineno_width(longest_src_lines);
-	max_digits = lineno_width(longest_dst_lines);
-	max_score_digits = lineno_width(largest_score);
+	max_orig_digits = decimal_width(longest_src_lines);
+	max_digits = decimal_width(longest_dst_lines);
+	max_score_digits = decimal_width(largest_score);
 }
 
 /*
diff --git a/cache.h b/cache.h
index 881524f..d908184 100644
--- a/cache.h
+++ b/cache.h
@@ -1187,6 +1187,7 @@ extern const char *pager_program;
 extern int pager_in_use(void);
 extern int pager_use_color;
 extern int term_columns(void);
+extern int decimal_width(uintmax_t number);
 
 extern const char *editor_program;
 extern const char *askpass_program;
diff --git a/pager.c b/pager.c
index b790967..60be7bb 100644
--- a/pager.c
+++ b/pager.c
@@ -147,3 +147,16 @@ int term_columns(void)
 
 	return term_columns_at_startup;
 }
+
+/*
+ * How many columns do we need to show this number in decimal?
+ */
+int decimal_width(uintmax_t number)
+{
+	int width;
+	uintmax_t i;
+
+	for (width = 1, i = 10; i <= number; width++)
+		i *= 10;
+	return width;
+}
-- 
1.7.9.2.332.g05f13