dedup

commit 5e2a473da8667cab7b0df876ffa9e02ff2dae096
parent 444786bf6ec93a0d2cdce9bcb5b87dd67a18281f
Author: sin <sin@2f30.org>
Date:   Fri,  3 May 2019 14:51:23 +0100

Add error reporting functions for snapshots

Diffstat:
M
snap.c
 | 
26
++++++++++++++++++++++++++
M
snap.h
 | 
2
++

2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/snap.c b/snap.c
@@ -4,6 +4,7 @@
 
 #include <fcntl.h>
 #include <limits.h>
+#include <stdarg.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -14,6 +15,7 @@
 #include "queue.h"
 #include "snap.h"
 
+#define NERRBUF	128
 extern ssize_t xread(int, void *, size_t);
 extern ssize_t xwrite(int, void *, size_t);
 
@@ -29,6 +31,8 @@ struct sctx {
 	int rdonly;
 };
 
+static char errbuf[NERRBUF];
+
 static int
 loadmd(struct sctx *sctx)
 {
@@ -221,3 +225,25 @@ sclose(struct sctx *sctx)
 	free(sctx);
 	return r;
 }
+
+void
+sseterr(char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vsnprintf(errbuf, NERRBUF, fmt, ap);
+	va_end(ap);
+}
+
+void
+serr(char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	fprintf(stderr, ": %s\n", errbuf);
+	va_end(ap);
+	exit(1);
+}
diff --git a/snap.h b/snap.h
@@ -11,3 +11,5 @@ extern int sget(struct sctx *, unsigned char *);
 extern int srewind(struct sctx *);
 extern int ssync(struct sctx *);
 extern int sclose(struct sctx *);
+extern void sseterr(char *, ...);
+extern void serr(char *, ...);