utils-extra

commit: d749352609d337968c846bd9056462bebf7331a0
parent ae890c1c83e975c49a4f4194d342a000667b3097
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Sat, 11 Oct 2025 00:47:22 +0200

cmd/gai_strerror: new

Diffstat:
A
cmd/gai_strerror.c
73
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 73 insertions(+), 0 deletions(-)
diff --git a/cmd/gai_strerror.c b/cmd/gai_strerror.c
@@ -0,0 +1,73 @@
+// utils-extra: Collection of extra tools for Unixes
+// SPDX-FileCopyrightText: 2017 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
+// SPDX-License-Identifier: MPL-2.0
+
+#define _DEFAULT_SOURCE
+#include <netdb.h>
+#include <stdio.h>
+#include <string.h>
+
+struct nameval
+{
+	const char *name;
+	int val;
+};
+
+#define GAI_ERR(ecode) {.name = #ecode, .val = ecode}
+static struct nameval ecodes[] = {
+    GAI_ERR(EAI_AGAIN),
+    GAI_ERR(EAI_BADFLAGS),
+    GAI_ERR(EAI_FAIL),
+    GAI_ERR(EAI_FAMILY),
+    GAI_ERR(EAI_MEMORY),
+#ifdef EAI_NODATA
+    GAI_ERR(EAI_NODATA),
+#endif
+    GAI_ERR(EAI_NONAME),
+    GAI_ERR(EAI_OVERFLOW),
+    GAI_ERR(EAI_SERVICE),
+    GAI_ERR(EAI_SOCKTYPE),
+    GAI_ERR(EAI_SYSTEM),
+};
+static int ecodes_len = sizeof(ecodes) / sizeof(*ecodes);
+
+int
+main(int argc, char *argv[])
+{
+	argc -= 1;
+	argv += 1;
+
+	if(argc == 0)
+	{
+		for(int i = 0; i < ecodes_len; i++)
+			printf("%s: %s\n", ecodes[i].name, gai_strerror(ecodes[i].val));
+
+		return 0;
+	}
+
+	for(int argi = 0; argi < argc; argi++)
+	{
+		if(memcmp("EAI_", argv[argi], 4) != 0)
+		{
+			fprintf(stderr,
+			        "gai_strerror: error: ecode name needs to start with EAI_, got '%s'\n",
+			        argv[argi]);
+			return 1;
+		}
+
+		int ei = 0;
+		for(; ei < ecodes_len; ei++)
+		{
+			if(strcmp(ecodes[ei].name, argv[argi]) == 0)
+			{
+				printf("%s: %s\n", ecodes[ei].name, gai_strerror(ecodes[ei].val));
+				break;
+			}
+		}
+		if(ei == ecodes_len)
+		{
+			fprintf(stderr, "gai_strerror: error: Unknown ecode \"%s\"\n", argv[argi]);
+			return 1;
+		}
+	}
+}