utils: add safe_uint32() helper

[mirror_lxcfs.git] / src / utils.c

diff --git a/src/utils.c b/src/utils.c
index 926760df5a3bf9e10e291a4010d0fddba9cac816..6bfedeba725a88f038cba6f8d4af0394b8967311 100644 (file)
--- a/src/utils.c
+++ b/src/utils.c
@@ -529,6 +529,29 @@ int safe_uint64(const char *numstr, uint64_t *converted, int base)
        return 0;
 }
 
+int safe_uint32(const char *numstr, uint32_t *converted, int base)
+{
+       char *err = NULL;
+       unsigned long uli;
+
+       while (isspace(*numstr))
+               numstr++;
+
+       if (*numstr == '-')
+               return -EINVAL;
+
+       errno = 0;
+       uli = strtoul(numstr, &err, base);
+       if (errno == ERANGE && uli == UINT32_MAX)
+               return -ERANGE;
+
+       if (err == numstr || *err != '\0')
+               return -EINVAL;
+
+       *converted = (uint32_t)uli;
+       return 0;
+}
+
 static int char_left_gc(const char *buffer, size_t len)
 {
        size_t i;