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configure: Check for error.h

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For portability, check for error.h during configure and define
HAVE_ERROR_H accordingly.

If this header is not available, emulate the functionality of error()
from glibc with an inline wrapper in include/c.h.
This commit is contained in:
Rainer Müller
2013-02-20 20:14:29 +01:00
parent 6df4fc403d
commit 838e5d8941
3 changed files with 29 additions and 1 deletions
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21
include/c.h
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@ -16,7 +16,11 @@
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_ERROR_H
#include <error.h>
#else
#include <stdarg.h>
#endif
/*
* Compiler specific stuff
@ -103,6 +107,23 @@ static inline char *prog_inv_sh_nm_from_file(char *f, char stripext)
/*
* Error printing.
*/
#ifndef HAVE_ERROR_H
/* Emulate the error() function from glibc */
__attribute__((__format__(__printf__, 3, 4)))
static void error(int status, int errnum, const char *format, ...)
{
va_list argp;
fprintf(stderr, "%s: ", program_invocation_short_name);
va_start(argp, format);
vfprintf(stderr, format, argp);
va_end(argp);
if (errnum != 0)
fprintf(stderr, ": error code %d", errnum);
fprintf(stderr, "\n");
if (status != 0)
exit(status);
}
#endif
#define xwarn(...) error(0, errno, __VA_ARGS__)
#define xwarnx(...) error(0, 0, __VA_ARGS__)
#define xerr(STATUS, ...) error(STATUS, errno, __VA_ARGS__)