From cf0f037ac861a3f4fd877e79f3e53877a446f722 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Fri, 22 Jan 2016 21:35:48 -0600
Subject: Factor out insanitize() from seq.c to next_printf() in lib.

---
 lib/lib.c      | 18 ++++++++++++++++++
 lib/lib.h      |  1 +
 toys/lsb/seq.c | 19 +++++--------------
 3 files changed, 24 insertions(+), 14 deletions(-)

diff --git a/lib/lib.c b/lib/lib.c
index b0ac4715..6559030c 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -1015,3 +1015,21 @@ char *show_uuid(char *uuid)
 
   return libbuf;
 }
+
+// Returns pointer to letter at end, 0 if none. *start = initial %
+char *next_printf(char *s, char **start)
+{
+  for (; *s; s++) {
+    if (*s != '%') continue;
+    if (*++s == '%') continue;
+    if (start) *start = s-1;
+    while (0 <= stridx("0'#-+ ", *s)) s++;
+    while (isdigit(*s)) s++;
+    if (*s == '.') s++;
+    while (isdigit(*s)) s++;
+
+    return s;
+  }
+
+  return 0;
+}
diff --git a/lib/lib.h b/lib/lib.h
index f1cea22e..e3dbc462 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -196,6 +196,7 @@ int yesno(int def);
 int qstrcmp(const void *a, const void *b);
 void create_uuid(char *uuid);
 char *show_uuid(char *uuid);
+char *next_printf(char *s, char **start);
 
 #define HR_SPACE 1 // Space between number and units
 #define HR_B     2 // Use "B" for single byte units
diff --git a/toys/lsb/seq.c b/toys/lsb/seq.c
index c6204742..3ff9ca44 100644
--- a/toys/lsb/seq.c
+++ b/toys/lsb/seq.c
@@ -32,22 +32,13 @@ GLOBALS(
 // Ensure there's one %f escape with correct attributes
 static void insanitize(char *f)
 {
-  char *s;
-  int found = 0;
+  char *s = next_printf(f, 0);
 
-  for (s = f; *s; s++) {
-    if (*s != '%') continue;
-    if (*++s == '%') continue;
-    if (found++) break;
-    while (0 <= stridx("0'#-+ ", *s)) s++;
-    while (isdigit(*s)) s++;
-    if (*s == '.') s++;
-    while (isdigit(*s)) s++;
-    if (-1 == stridx("aAeEfFgG", *s)) break;
+  if (!s) error_exit("bad -f no %%f");
+  if (-1 == stridx("aAeEfFgG", *s) || (s = next_printf(s, 0))) {
+    // The @ is a byte offset, not utf8 chars. Waiting for somebody to complain.
+    error_exit("bad -f '%s'@%ld", f, s-f+1);
   }
-
-  // The @ is a byte offset, not utf8 chars. Waiting for somebody to complain...
-  if (*s || !found) error_exit("bad -f '%s'@%ld", f, s-f+1);
 }
 
 void seq_main(void)
-- 
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