[PATCH] livepatch-tools: remove usage of error.h

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

It's a GNU libc specific header which prevents building on musl for
example.  Instead open code an equivalent replacement for the usage
of ERROR() and DIFF_FATAL() macros.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
 common.h             | 10 ++++++----
 create-diff-object.c |  1 -
 lookup.c             |  7 +++++--
 prelink.c            |  1 -
 4 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/common.h b/common.h
index 9a9da79..ec2ea33 100644
--- a/common.h
+++ b/common.h
@@ -1,18 +1,20 @@
 #ifndef _COMMON_H_
 #define _COMMON_H_
 
-#include <error.h>
-
 extern char *childobj;
 
 #define ERROR(format, ...) \
-       error(1, 0, "ERROR: %s: %s: %d: " format, childobj, __FUNCTION__, 
__LINE__, ##__VA_ARGS__)
+({ \
+       fflush(stdout); \
+       fprintf(stderr, "ERROR: %s: %s: %d: " format "\n", childobj, 
__FUNCTION__, __LINE__, ##__VA_ARGS__); \
+       exit(1); \
+})
 
 #define DIFF_FATAL(format, ...) \
 ({ \
        fflush(stdout); \
        fprintf(stderr, "ERROR: %s: " format "\n", childobj, ##__VA_ARGS__); \
-       error(2, 0, "unreconcilable difference"); \
+       exit(2); \
 })
 
 #define log_debug(format, ...) log(DEBUG, format, ##__VA_ARGS__)
diff --git a/create-diff-object.c b/create-diff-object.c
index 780e6c8..d8a0032 100644
--- a/create-diff-object.c
+++ b/create-diff-object.c
@@ -45,7 +45,6 @@
 #include <string.h>
 #include <libgen.h>
 #include <argp.h>
-#include <error.h>
 #include <unistd.h>
 #include <time.h>
 #include <gelf.h>
diff --git a/lookup.c b/lookup.c
index 39125c6..b440102 100644
--- a/lookup.c
+++ b/lookup.c
@@ -28,14 +28,17 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#include <error.h>
 #include <gelf.h>
 #include <unistd.h>
 
 #include "lookup.h"
 
 #define ERROR(format, ...) \
-       error(1, 0, "%s: %d: " format, __FUNCTION__, __LINE__, ##__VA_ARGS__)
+({ \
+       fflush(stdout); \
+       fprintf(stderr, "%s: %d: " format, __FUNCTION__, __LINE__, 
##__VA_ARGS__); \
+       exit(1); \
+})
 
 struct symbol {
        unsigned long value;
diff --git a/prelink.c b/prelink.c
index 2039e5b..18c5159 100644
--- a/prelink.c
+++ b/prelink.c
@@ -27,7 +27,6 @@
 #include <string.h>
 #include <libgen.h>
 #include <argp.h>
-#include <error.h>
 #include <unistd.h>
 #include <gelf.h>
 
-- 
2.40.0