This patch clones strtobool() from kernel's string.c to perf's string.c,
then add the function entry to tools/perf/util/include/linux/string.h.
string.h in perf utils doesn't have #ifdef guard. This patch fixes it.
This is preparation for enforcing BPF program configuration, which
would allow config string like 'inlines=yes'.
Signed-off-by: Wang Nan <wangn...@huawei.com>
Cc: Alexei Starovoitov <a...@kernel.org>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu...@hitachi.com>
Cc: Zefan Li <lize...@huawei.com>
Cc: pi3or...@163.com
---
tools/perf/util/include/linux/string.h | 5 +++++
tools/perf/util/string.c | 28 ++++++++++++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/tools/perf/util/include/linux/string.h
b/tools/perf/util/include/linux/string.h
index 6f19c54..2bb0057 100644
--- a/tools/perf/util/include/linux/string.h
+++ b/tools/perf/util/include/linux/string.h
@@ -1,3 +1,8 @@
+#ifndef PERF_LINUX_STRING_H_
+#define PERF_LINUX_STRING_H_
#include <string.h>
void *memdup(const void *src, size_t len);
+
+int strtobool(const char *s, bool *res);
+#endif
diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
index fc8781d..c7fd44d 100644
--- a/tools/perf/util/string.c
+++ b/tools/perf/util/string.c
@@ -396,3 +396,31 @@ out_err_overflow:
free(expr);
return NULL;
}
+
+/**
+ * strtobool - convert common user inputs into boolean values
+ * @s: input string
+ * @res: result
+ *
+ * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
+ * Otherwise it will return -EINVAL. Value pointed to by res is
+ * updated upon finding a match.
+ */
+int strtobool(const char *s, bool *res)
+{
+ switch (s[0]) {
+ case 'y':
+ case 'Y':
+ case '1':
+ *res = true;
+ break;
+ case 'n':
+ case 'N':
+ case '0':
+ *res = false;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
--
1.8.3.4
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