1 files changed, 30 insertions, 0 deletions

diff --git a/scripts/dtc/util.c b/scripts/dtc/util.c
index fb124eea4919..3550f86bd6df 100644
--- a/scripts/dtc/util.c
+++ b/scripts/dtc/util.c
@@ -46,6 +46,36 @@ char *xstrdup(const char *s)
         return d;
 }
 
+/* based in part from (3) vsnprintf */
+int xasprintf(char **strp, const char *fmt, ...)
+{
+        int n, size = 128;      /* start with 128 bytes */
+        char *p;
+        va_list ap;
+
+        /* initial pointer is NULL making the fist realloc to be malloc */
+        p = NULL;
+        while (1) {
+                p = xrealloc(p, size);
+
+                /* Try to print in the allocated space. */
+                va_start(ap, fmt);
+                n = vsnprintf(p, size, fmt, ap);
+                va_end(ap);
+
+                /* If that worked, return the string. */
+                if (n > -1 && n < size)
+                        break;
+                /* Else try again with more space. */
+                if (n > -1)     /* glibc 2.1 */
+                        size = n + 1; /* precisely what is needed */
+                else            /* glibc 2.0 */
+                        size *= 2; /* twice the old size */
+        }
+        *strp = p;
+        return strlen(p);
+}
+
 char *join_path(const char *path, const char *name)
 {
         int lenp = strlen(path);