Add slurpn, refactor slurp, fix avltree/cdbmake bugs, add strerr_warnf

Signed-off-by: Laurent Bercot <ska@appnovation.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/src/libstddjb/slurpn.c b/src/libstddjb/slurpn.c
new file mode 100644
index 0000000..c9c5c11
--- /dev/null
+++ b/src/libstddjb/slurpn.c
@@ -0,0 +1,35 @@
+/* ISC license. */
+
+#include <sys/types.h>
+#include <errno.h>
+
+#include <skalibs/allreadwrite.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+#define N 4096
+
+int slurpn (int fd, stralloc *sa, size_t max)
+{
+  size_t sabase = sa->len ;
+  int wasnull = !sa->s ;
+  for (;;)
+  {
+    ssize_t r ;
+    size_t n = max && sa->len + N > max ? max - sa->len : N ;
+    if (!n) { errno = ENOBUFS ; goto err ; }
+    if (!stralloc_readyplus(sa, n)) break ;
+    r = fd_read(fd, sa->s + sa->len, n) ;
+    switch (r)
+    {
+      case -1 : goto err ;
+      case 0 : return 1 ;
+      default : sa->len += r ;
+    }
+  }
+
+err:
+  if (wasnull) stralloc_free(sa) ;
+  else sa->len = sabase ;
+  return 0 ;
+}