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authorLaurent Bercot <ska-skaware@skarnet.org>2017-12-21 11:18:28 +0000
committerLaurent Bercot <ska-skaware@skarnet.org>2017-12-21 11:18:28 +0000
commit2990ce9b390ec1e2bfa1c043c406878e8aff86dd (patch)
tree270e5e2bfa3cdb2fc795039fc45901d93290567e /src/libstddjb/siovec_search.c
parent933e986a9207d2b61c5119e18603b44b924e7226 (diff)
downloadskalibs-2990ce9b390ec1e2bfa1c043c406878e8aff86dd.tar.xz
Big 2.6.3.0 reorganization
- Add libposixplz, update headers - Add memmem and friends - Add textmessage to libunixonacid - Update some sysdeps tests
Diffstat (limited to 'src/libstddjb/siovec_search.c')
-rw-r--r--src/libstddjb/siovec_search.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/src/libstddjb/siovec_search.c b/src/libstddjb/siovec_search.c
new file mode 100644
index 0000000..ef64e96
--- /dev/null
+++ b/src/libstddjb/siovec_search.c
@@ -0,0 +1,30 @@
+/* ISC license. */
+
+#include <string.h>
+#include <sys/uio.h>
+#include <skalibs/posixplz.h>
+#include <skalibs/siovec.h>
+
+size_t siovec_search (struct iovec const *v, unsigned int n, char const *needle, size_t nlen)
+{
+ size_t vlen = siovec_len(v, n) ;
+ size_t w = 0 ;
+ unsigned int i = 0 ;
+ for (; i < n ; i++)
+ {
+ char *p = memmem(v[i].iov_base, v[i].iov_len, needle, nlen) ;
+ if (p) return w + (p - (char *)v[i].iov_base) ;
+ if (i < n-1 && nlen > 1 && v[i].iov_len)
+ {
+ size_t prelen = v[i].iov_len < nlen ? v[i].iov_len : nlen ;
+ size_t postlen = vlen - w - v[i].iov_len < nlen ? vlen - w - v[i].iov_len : nlen ;
+ char buf[prelen + postlen - 2] ;
+ memcpy(buf, (char *)v[i].iov_base + v[i].iov_len - prelen + 1, prelen - 1) ;
+ siovec_gather(v + i + 1, n - 1 - i, buf + prelen - 1, postlen - 1) ;
+ p = memmem(buf, prelen + postlen - 2, needle, nlen) ;
+ if (p) return w + v[i].iov_len - prelen + 1 + (p - buf) ;
+ }
+ w += v[i].iov_len ;
+ }
+ return w ;
+}