1 files changed, 28 insertions, 0 deletions
diff --git a/src/libstddjb/getlnmax.c b/src/libstddjb/getlnmax.c
new file mode 100644
index 0000000..e3fde8f
--- /dev/null
+++ b/src/libstddjb/getlnmax.c
@@ -0,0 +1,28 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/buffer.h>
+#include <skalibs/skamisc.h>
+
+int getlnmax (buffer *b, char *d, unsigned int max, unsigned int *w, char sep)
+{
+  if (max < *w) return (errno = EINVAL, -1) ;
+  for (;;)
+  {
+    siovec_t v[2] ;
+    unsigned int len = buffer_len(b) ;
+    unsigned int pos ;
+    int r ;
+    buffer_rpeek(b, v) ;
+    if (len > max - *w) len = max - *w ;
+    pos = siovec_bytechr(v, 2, sep) ;
+    if (pos > len) pos = len ;
+    r = pos < len ;
+    buffer_getnofill(b, d + *w, pos + r) ; *w += pos ;
+    if (*w >= max) return (errno = ERANGE, -1) ;
+    if (r) return 1 ;
+    r = buffer_fill(b) ;
+    if (r <= 0) return r ;
+  }
+}