From 240baf2b88e34c1600aa2d11a1f1d9a11af4893f Mon Sep 17 00:00:00 2001
From: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Date: Thu, 27 Aug 2020 15:39:26 -0400
Subject: [PATCH] Implement utils_parse_unsigned_long_long
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

To be used for trigger creation.

Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Id7d9f76f3b9a29c9657eaa0daf3eb112fee54b09
---
 src/common/utils.c | 36 ++++++++++++++++++++++++++++++++++++
 src/common/utils.h | 12 ++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/src/common/utils.c b/src/common/utils.c
index bd61fff3d..134d2054f 100644
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -1669,3 +1669,39 @@ end:
 	free(buf);
 	return ret_val;
 }
+
+LTTNG_HIDDEN
+int utils_parse_unsigned_long_long(const char *str,
+		unsigned long long *value)
+{
+	int ret;
+	char *endptr;
+
+	assert(str);
+	assert(value);
+
+	errno = 0;
+	*value = strtoull(str, &endptr, 10);
+
+	/* Conversion failed. Out of range? */
+	if (errno != 0) {
+		/* Don't print an error; allow the caller to log a better error. */
+		DBG("Failed to parse string as unsigned long long number: string = '%s', errno = %d",
+				str, errno);
+		ret = -1;
+		goto end;
+	}
+
+	/* Not the end of the string or empty string. */
+	if (*endptr || endptr == str) {
+		DBG("Failed to parse string as unsigned long long number: string = '%s'",
+				str);
+		ret = -1;
+		goto end;
+	}
+
+	ret = 0;
+
+end:
+	return ret;
+}
diff --git a/src/common/utils.h b/src/common/utils.h
index dec4cd8aa..570216d53 100644
--- a/src/common/utils.h
+++ b/src/common/utils.h
@@ -59,4 +59,16 @@ enum lttng_error_code utils_user_id_from_name(
 enum lttng_error_code utils_group_id_from_name(
 		const char *group_name, gid_t *group_id);
 
+/*
+ * Parse `str` as an unsigned long long value.
+ *
+ * Return 0 on success.  Return -1 on failure which can be because:
+ *
+ * - `str` is zero length
+ * - `str` contains invalid
+ */
+LTTNG_HIDDEN
+int utils_parse_unsigned_long_long(const char *str,
+		unsigned long long *value);
+
 #endif /* _COMMON_UTILS_H */
-- 
2.34.1