From af5a49e489fdc04b9cf02547650d7aeaccd43793 Mon Sep 17 00:00:00 2001
From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
Date: Mon, 14 Dec 2020 10:58:12 -0600
Subject: string: Add wrong strerror_r

---
 libgcompat/string.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'libgcompat')

diff --git a/libgcompat/string.c b/libgcompat/string.c
index 9852bea..f2a2e87 100644
--- a/libgcompat/string.c
+++ b/libgcompat/string.c
@@ -1,9 +1,12 @@
 #define _GNU_SOURCE /* mempcpy */
 #include <assert.h> /* assert */
+#include <dlfcn.h>  /* dlsym, RTLD_NEXT */
 #include <stddef.h> /* NULL, size_t */
 #include <stdint.h> /* SIZE_MAX */
 #include <stdlib.h> /* rand_r */
+#define strerror_r no_strerror_r
 #include <string.h> /* memcpy, strcpy, strncat, strndup */
+#undef strerror_r
 #include <time.h>   /* time */
 #include <unistd.h> /* getpid */
 
@@ -210,6 +213,21 @@ char *__strdup(const char *string)
 	return strdup(string);
 }
 
+/**
+ * Non-POSIX strerror_r.
+ */
+static int (*real_strerror_r)(int, char *, size_t);
+
+char *strerror_r(int errnum, char *buf, size_t buflen)
+{
+	if (real_strerror_r == NULL) {
+		real_strerror_r = dlsym(RTLD_NEXT, "strerror_r");
+		assert(real_strerror_r);
+	}
+	real_strerror_r(errnum, buf, buflen);
+	return buf;
+}
+
 /**
  * Concatenate a string with part of another, with buffer overflow checking.
  *
-- 
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