[PATCH 9/9] tools, perf: Add asprintf replacement

From: Andi Kleen
Date: Mon May 12 2014 - 19:21:39 EST


From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

asprintf corrupts memory on some older glibc versions.
Provide a replacement. This fixes various segfaults
with --branch-history on older Fedoras.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
tools/perf/Makefile.perf | 1 +
tools/perf/util/asprintf.c | 28 ++++++++++++++++++++++++++++
2 files changed, 29 insertions(+)
create mode 100644 tools/perf/util/asprintf.c

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 50d875d..7183179 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -373,6 +373,7 @@ LIB_OBJS += $(OUTPUT)util/vdso.o
LIB_OBJS += $(OUTPUT)util/stat.o
LIB_OBJS += $(OUTPUT)util/record.o
LIB_OBJS += $(OUTPUT)util/srcline.o
+LIB_OBJS += $(OUTPUT)util/asprintf.o
LIB_OBJS += $(OUTPUT)util/data.o

LIB_OBJS += $(OUTPUT)ui/setup.o
diff --git a/tools/perf/util/asprintf.c b/tools/perf/util/asprintf.c
new file mode 100644
index 0000000..9aafaca
--- /dev/null
+++ b/tools/perf/util/asprintf.c
@@ -0,0 +1,28 @@
+/* Replacement for asprintf as it's buggy in older glibc versions */
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+int vasprintf(char **str, const char *fmt, va_list ap)
+{
+ char buf[1024];
+ int len = vsnprintf(buf, sizeof buf, fmt, ap);
+
+ *str = malloc(len + 1);
+ if (!*str)
+ return -1;
+ strcpy(*str, buf);
+ return len;
+}
+
+int asprintf(char **str, const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = vasprintf(str, fmt, ap);
+ va_end(ap);
+ return ret;
+}
--
1.9.0

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