Remove dependency on glibc-specific error.h

src/Makefile.am

@@ -49,4 +49,5 @@ dcfldd_SOURCES = dcfldd.c \
                  full-write.h \
                  output.c output.h \
                  split.c split.h \
-                 hashformat.c hashformat.h
+                 hashformat.c hashformat.h \
+                 error.c error.h

src/dcfldd.c

@@ -74,6 +74,8 @@
 #include "util.h"
 #include "log.h"
 
+extern char *program_invocation_name;
+
 /* The name this program was run with. */
 char *program_name;
 
@@ -719,6 +721,8 @@ int main(int argc, char **argv)
     for (i = 0; i < 256; i++)
         trans_table[i] = i;
 
+    program_invocation_name = basename(argv[0]);
+
     /* Decode arguments. */
     scanargs(argc, argv);
 

src/error.c

@@ -0,0 +1,30 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+extern char *program_invocation_name;
+
+/* mimics GNU libc error() behavior */
+void error(int status, int errnum, const char *format, ...) {
+	va_list args;
+	va_start(args, format);
+
+	fflush (stdout);
+	fprintf(stderr, "%s: ", program_invocation_name);
+
+	vfprintf(stderr, format, args);
+	va_end(args);
+
+	if (errnum) {
+		fprintf(stderr, ": %s", strerror(errnum));
+	}
+
+	fprintf(stderr, "\n");
+
+	if (status) {
+		exit(status);
+	}
+}
+

src/error.h

@@ -0,0 +1,6 @@
+#ifndef DCFLDD_ERROR_H
+#define DCFLDD_ERROR_H
+
+void error(int status, int errnum, const char *format, ...);
+
+#endif /* DCFLDD_ERROR_H */

src/util.c

@@ -120,7 +120,7 @@ void skip2(int fdesc, char *file, uintmax_t records, size_t blocksize,
 
 #ifdef __linux__
 
-# include <error.h>
+# include "error.h"
 # include <sys/mtio.h>
 
 # define MT_SAME_POSITION(P, Q) \