From 3e63da180bc6cbce7c0673419a1a4a0f021591bb Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Fri, 30 Jul 2021 15:03:21 -0700
Subject: Cleaner checking of stdlib negative returns

---
 utils.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'utils.c')

diff --git a/utils.c b/utils.c
index 578b59c..60e12eb 100644
--- a/utils.c
+++ b/utils.c
@@ -139,6 +139,21 @@ void *check_nonnull(void *p, const char *err_msg, ...)
     return p;
 }
 
+//
+// If the given argument is negative, print the error message and exit with
+// failure. Otherwise return the given argument.
+//
+int check_nonnegative(int i, const char *err_msg, ...)
+{
+    if (i < 0) {
+        va_list args;
+        va_start(args, err_msg);
+        verr(EXIT_FAILURE, err_msg, args);
+        va_end(args);
+    }
+    return i;
+}
+
 //
 // Case-insensitive memory comparison
 //
-- 
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