We have at least two places which convert a string to a boolean type,
so create a common function for this. strtobool treats
- any positive (nonzero) number as true
- "0" as false
- "true" (case insensitive) as true
- "false" (case insensitive) as false
Every other value results in an error and the input *val is not
modified. The caller is expected to initialize *val with the correct
default before calling strtobool.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
include/string.h | 1 +
lib/string.c | 43 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+)
diff --git a/include/string.h b/include/string.h
index a833da1..0c557d6 100644
--- a/include/string.h
+++ b/include/string.h
@@ -4,5 +4,6 @@
#include <linux/string.h>
void *memdup(const void *, size_t);
+int strtobool(const char *str, int *val);
#endif /* __STRING_H */
diff --git a/lib/string.c b/lib/string.c
index 6a39eb5..a3e9fd8 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -739,3 +739,46 @@ void *memdup(const void *orig, size_t size)
return buf;
}
EXPORT_SYMBOL(memdup);
+
+/**
+ * strtobool - convert a string to a boolean value
+ * @str - The string
+ * @val - The boolean value returned.
+ *
+ * This function treats
+ * - any positive (nonzero) number as true
+ * - "0" as false
+ * - "true" (case insensitive) as true
+ * - "false" (case insensitive) as false
+ *
+ * Every other value results in an error and the @val is not
+ * modified. The caller is expected to initialize @val with the
+ * correct default before calling strtobool.
+ *
+ * Returns 0 for success or negative error code if the variable does
+ * not exist or contains something this function does not recognize
+ * as true or false.
+ */
+int strtobool(const char *str, int *val)
+{
+ if (!str || !*str)
+ return -EINVAL;
+
+ if (simple_strtoul(str, NULL, 0) > 0) {
+ *val = true;
+ return 0;
+ }
+
+ if (!strcmp(str, "0") || !strcasecmp(str, "false")) {
+ *val = false;
+ return 0;
+ }
+
+ if (!strcasecmp(str, "true")) {
+ *val = true;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL(strtobool);
--
2.8.0.rc3
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
