/* error.h — GNU-style error reporting.
 *
 * Red Bear OS / relibc. Mirrors glibc <error.h>: error() and error_at_line()
 * print the program name (best effort), a formatted message, and optionally a
 * strerror() of errnum to stderr, then exit() when status is non-zero. Provided
 * as complete inline implementations so portable tooling (elfutils/libelf,
 * GNU-style CLIs) that includes <error.h> builds and behaves correctly.
 */
#ifndef _ERROR_H
#define _ERROR_H 1

#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

static inline void error(int __status, int __errnum, const char *__format, ...) {
    va_list __ap;
    fflush(stdout);
    va_start(__ap, __format);
    vfprintf(stderr, __format, __ap);
    va_end(__ap);
    if (__errnum != 0) {
        fprintf(stderr, ": %s", strerror(__errnum));
    }
    fputc('\n', stderr);
    if (__status != 0) {
        exit(__status);
    }
}

static inline void error_at_line(int __status, int __errnum,
                                 const char *__fname, unsigned int __lineno,
                                 const char *__format, ...) {
    va_list __ap;
    fflush(stdout);
    if (__fname != NULL) {
        fprintf(stderr, "%s:%u: ", __fname, __lineno);
    }
    va_start(__ap, __format);
    vfprintf(stderr, __format, __ap);
    va_end(__ap);
    if (__errnum != 0) {
        fprintf(stderr, ": %s", strerror(__errnum));
    }
    fputc('\n', stderr);
    if (__status != 0) {
        exit(__status);
    }
}

#ifdef __cplusplus
}
#endif

#endif /* error.h */