+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2016, Olivier MATZ <zer0@droids-corp.org>
+ */
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <ecoli_assert.h>
+#include <ecoli_malloc.h>
+#include <ecoli_string.h>
+
+/* count the number of identical chars at the beginning of 2 strings */
+size_t ec_strcmp_count(const char *s1, const char *s2)
+{
+ size_t i = 0;
+
+ while (s1[i] && s2[i] && s1[i] == s2[i])
+ i++;
+
+ return i;
+}
+
+int ec_str_startswith(const char *s, const char *beginning)
+{
+ size_t len;
+
+ len = ec_strcmp_count(s, beginning);
+ if (beginning[len] == '\0')
+ return 1;
+
+ return 0;
+}
+
+int ec_vasprintf(char **buf, const char *fmt, va_list ap)
+{
+ char dummy;
+ int buflen, ret;
+ va_list aq;
+
+ va_copy(aq, ap);
+ *buf = NULL;
+ ret = vsnprintf(&dummy, 1, fmt, aq);
+ va_end(aq);
+ if (ret < 0)
+ return ret;
+
+ buflen = ret + 1;
+ *buf = ec_malloc(buflen);
+ if (*buf == NULL)
+ return -1;
+
+ va_copy(aq, ap);
+ ret = vsnprintf(*buf, buflen, fmt, aq);
+ va_end(aq);
+
+ ec_assert_print(ret < buflen, "invalid return value for vsnprintf");
+ if (ret < 0) {
+ free(*buf);
+ *buf = NULL;
+ return -1;
+ }
+
+ return ret;
+}
+
+int ec_asprintf(char **buf, const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = ec_vasprintf(buf, fmt, ap);
+ va_end(ap);
+
+ return ret;
+}