From 000e932a844ecc6cd59ae9cadc3c3150d4a6bf5b Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Thu, 16 Jun 2016 12:21:16 +0200
Subject: Add fz_format_output_path function.

---
 include/mupdf/fitz/string.h |  9 +++++++++
 source/fitz/string.c        | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/include/mupdf/fitz/string.h b/include/mupdf/fitz/string.h
index 7700b6c7..9f1f656b 100644
--- a/include/mupdf/fitz/string.h
+++ b/include/mupdf/fitz/string.h
@@ -62,6 +62,15 @@ void fz_dirname(char *dir, const char *path, int dirsize);
 */
 char *fz_urldecode(char *url);
 
+/*
+	fz_format_output_path: create output file name using a template.
+		If the path contains %[0-9]*d, the first such pattern will be replaced
+		with the page number. If the template does not contain such a pattern, the page
+		number will be inserted before the file suffix. If the template does not have
+		a file suffix, the page number will be added to the end.
+*/
+void fz_format_output_path(fz_context *ctx, char *path, int size, const char *fmt, int page);
+
 /*
 	fz_cleanname: rewrite path to the shortest string that names the same path.
 
diff --git a/source/fitz/string.c b/source/fitz/string.c
index df171795..de9ee80f 100644
--- a/source/fitz/string.c
+++ b/source/fitz/string.c
@@ -142,6 +142,50 @@ fz_urldecode(char *url)
 	return url;
 }
 
+void
+fz_format_output_path(fz_context *ctx, char *path, int size, const char *fmt, int page)
+{
+	const char *s, *p;
+	char num[40];
+	int i, n;
+	int z = 0;
+
+	for (i = 0; page; page /= 10)
+		num[i++] = '0' + page % 10;
+	num[i] = 0;
+
+	s = p = strchr(fmt, '%');
+	if (p)
+	{
+		++p;
+		while (*p >= '0' && *p <= '9')
+			z = z * 10 + (*p++ - '0');
+	}
+	if (p && *p == 'd')
+	{
+		++p;
+	}
+	else
+	{
+		s = p = strrchr(fmt, '.');
+		if (!p)
+			s = p = fmt + strlen(fmt);
+	}
+
+	if (z < 1)
+		z = 1;
+	while (i < z && i < sizeof num)
+		num[i++] = '0';
+	n = s - fmt;
+	if (n + i + strlen(p) >= size)
+		fz_throw(ctx, FZ_ERROR_GENERIC, "path name buffer overflow");
+	memcpy(path, fmt, n);
+	while (i > 0)
+		path[n++] = num[--i];
+	fz_strlcpy(path + n, p, size - n);
+
+}
+
 #define SEP(x) ((x)=='/' || (x) == 0)
 
 char *
-- 
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