Add xstrndup().

2 files changed, 18 insertions, 0 deletions

diff --git a/xmalloc.c b/xmalloc.c
index a762d0a2..f722c73b 100644
--- a/xmalloc.c
+++ b/xmalloc.c
@@ -69,4 +69,16 @@ char *strdup(const char *s)
 }
 #endif /* !HAVE_STRDUP */
 
+char *xstrndup(const char *s, size_t len)
+{
+    char *p;
+    size_t l = strlen(s);
+
+    if (len < l) l = len;
+    p = (char *)xmalloc(l + 1);
+    memcpy(p, s, l);
+    p[l] = '\0';
+    return p;
+}
+
 /* xmalloc.c ends here */
diff --git a/xmalloc.h b/xmalloc.h
index 690b5741..81835828 100644
--- a/xmalloc.h
+++ b/xmalloc.h
@@ -25,4 +25,10 @@ XMALLOCTYPE *xrealloc(/*@null@*/ XMALLOCTYPE *, size_t n);
  * pointer, abort program on failure. */
 char *xstrdup(const char *src);
 
+/** Duplicate at most the first \a n characters from \a src to a newly
+ * malloc()d memory region and NUL-terminate it, and return its pointer, abort
+ * program on failure. The memory size is the lesser of either the string
+ * length including NUL byte or n + 1. */
+char *xstrndup(const char *src, size_t n);
+
 #endif