utils-extra

gai_strerror.c (1520B)

// 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;
		}
	}
}