Add fz_asprintf function to allocate a string and format output.

2 files changed, 21 insertions, 0 deletions

diff --git a/include/mupdf/fitz/output.h b/include/mupdf/fitz/output.h
index 48bcc502..9dd3de57 100644
--- a/include/mupdf/fitz/output.h
+++ b/include/mupdf/fitz/output.h
@@ -301,6 +301,11 @@ size_t fz_vsnprintf(char *buffer, size_t space, const char *fmt, va_list args);
 size_t fz_snprintf(char *buffer, size_t space, const char *fmt, ...);
 
 /*
+	fz_asprintf: Print to allocated string.
+*/
+char *fz_asprintf(fz_context *ctx, const char *fmt, ...);
+
+/*
 	fz_tempfilename: Get a temporary filename based upon 'base'.
 
 	'hint' is the path of a file (normally the existing document file)
diff --git a/source/fitz/printf.c b/source/fitz/printf.c
index cea13cc1..ddb8f17c 100644
--- a/source/fitz/printf.c
+++ b/source/fitz/printf.c
@@ -462,3 +462,19 @@ fz_snprintf(char *buffer, size_t space, const char *fmt, ...)
 
 	return out.n - 1;
 }
+
+char *
+fz_asprintf(fz_context *ctx, const char *fmt, ...)
+{
+	int len;
+	char *mem;
+	va_list ap;
+	va_start(ap, fmt);
+	len = fz_vsnprintf(NULL, 0, fmt, ap);
+	va_end(ap);
+	mem = fz_malloc(ctx, len+1);
+	va_start(ap, fmt);
+	fz_vsnprintf(mem, len+1, fmt, ap);
+	va_end(ap);
+	return mem;
+}