From: Christian Brauner <christian.brauner@canonical.com>
Date: Wed, 7 Sep 2016 15:47:50 +0000 (+0200)
Subject: utils: add lxc_safe_int()
X-Git-Tag: lxc-2.1.0~257^2~26
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5f845e7e0793607837757ea02dac1ccb44e8796;p=thirdparty%2Flxc.git

utils: add lxc_safe_int()

Signed-off-by: Christian Brauner <christian.brauner@canonical.com>
---

diff --git a/src/lxc/utils.c b/src/lxc/utils.c
index 9bf31570d..3b05842b6 100644
--- a/src/lxc/utils.c
+++ b/src/lxc/utils.c
@@ -2008,3 +2008,23 @@ int lxc_safe_uint(const char *numstr, unsigned int *converted)
 	*converted = (unsigned)uli;
 	return 0;
 }
+
+int lxc_safe_int(const char *numstr, int *converted)
+{
+	char *err = NULL;
+	signed long int sli;
+
+	errno = 0;
+	sli = strtol(numstr, &err, 0);
+	if (errno > 0)
+		return -errno;
+
+	if (!err || err == numstr || *err != '\0')
+		return -EINVAL;
+
+	if (sli > INT_MAX)
+		return -ERANGE;
+
+	*converted = (int)sli;
+	return 0;
+}
diff --git a/src/lxc/utils.h b/src/lxc/utils.h
index 0706125e1..8fba5152e 100644
--- a/src/lxc/utils.h
+++ b/src/lxc/utils.h
@@ -319,5 +319,6 @@ bool task_blocking_signal(pid_t pid, int signal);
 
 /* Helper functions to parse numbers. */
 int lxc_safe_uint(const char *numstr, unsigned int *converted);
+int lxc_safe_int(const char *numstr, int *converted);
 
 #endif /* __LXC_UTILS_H */