Add err function to write to stderr

2 files changed, 21 insertions, 0 deletions

diff --git a/include/gensvm_util.h b/include/gensvm_util.h
index 18aa553..2fd60e7 100644
--- a/include/gensvm_util.h
+++ b/include/gensvm_util.h
@@ -23,5 +23,6 @@ int gensvm_check_argv(int argc, char **argv, char *str);
 int gensvm_check_argv_eq(int argc, char **argv, char *str);
 
 void note(const char *fmt,...);
+void err(const char *fmt,...);
 
 #endif
diff --git a/src/gensvm_util.c b/src/gensvm_util.c
index db99e21..4353b40 100644
--- a/src/gensvm_util.c
+++ b/src/gensvm_util.c
@@ -126,3 +126,23 @@ void note(const char *fmt,...)
 	va_end(ap);
 	(*gensvm_print_string)(buf);
 }
+
+/**
+ * @brief Parse a formatted string and write it to standard error
+ *
+ * @details
+ * Shorthand for fprintf(stderr, ...)
+ *
+ * @param[in] 	fmt 	string format
+ * @param[in] 	... 	variable argument list for the string format
+ */
+void err(const char *fmt, ...)
+{
+	char buf[BUFSIZ];
+	va_list ap;
+	va_start(ap, fmt);
+	vsprintf(buf, fmt, ap);
+	va_end(ap);
+	fputs(buf, stderr);
+	fflush(stderr);
+}