From 753ceac3272a8c4f150ace8b4695991a85345c3c Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Fri, 22 Sep 2023 15:28:36 +0000
Subject:  Revamp case functions, add strcasestr() fallback

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/libposixplz/strcasestr.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 src/libposixplz/strcasestr.c

(limited to 'src/libposixplz/strcasestr.c')

diff --git a/src/libposixplz/strcasestr.c b/src/libposixplz/strcasestr.c
new file mode 100644
index 0000000..2347267
--- /dev/null
+++ b/src/libposixplz/strcasestr.c
@@ -0,0 +1,28 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+
+#ifndef SKALIBS_HASSTRCASESTR
+
+#include <string.h>
+
+#include <skalibs/bytestr.h>
+
+ /* XXX: copies strings on the stack, careful with long strings */
+
+char *strcasestr (char const *haystack, char const *needle)
+{
+  size_t nlen = strlen(needle) ;
+  size_t hlen = strlen(haystack) ;
+  char *p ;
+  char lneedle[nlen + 1] ;
+  char lhaystack[hlen + 1] ;
+  memcpy(lneedle, needle, nlen + 1) ;
+  memcpy(lhaystack, haystack, hlen + 1) ;
+  case_lowerb(lneedle, nlen) ;
+  case_lowerb(lhaystack, hlen) ;
+  p = strstr(lhaystack, lneedle) ;
+  return p ? haystack + (p - lhaystack) : 0 ;
+}
+
+#endif
-- 
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