str_extra.c

commit 9ddfa86916806e26a5fd1662e0720a3bfc13822b
Author: finwo <finwo@pm.me>
Date:   Sun, 13 Aug 2023 21:39:09 +0200

Initial commit

Diffstat:
A
.gitignore
 | 
1
+
A
config.mk
 | 
1
+
A
package.ini
 | 
7
+++++++
A
src/strnstr.c
 | 
26
++++++++++++++++++++++++++
A
src/strnstr.h
 | 
3
+++

5 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+*.o
diff --git a/config.mk b/config.mk
@@ -0,0 +1 @@
+SRC+=__DIRNAME/src/strnstr.c
diff --git a/package.ini b/package.ini
@@ -0,0 +1,7 @@
+[export]
+config.mk=config.mk
+include/finwo/strnstr.h=src/strnstr.h
+
+[package]
+deps=lib
+name=finwo/str_extra
diff --git a/src/strnstr.c b/src/strnstr.c
@@ -0,0 +1,26 @@
+#include "string.h"
+
+#include "strnstr.h"
+
+// Origin: https://stackoverflow.com/a/25705264/2928176
+// Author: Chris Dodd (https://stackoverflow.com/users/16406/chris-dodd)
+char *strnstr(const char *haystack, const char *needle, size_t len) {
+  int i;
+  size_t needle_len;
+
+  if (0 == (needle_len = strnlen(needle, len))) {
+    return NULL;
+  }
+
+  for (i=0; i<=(int)(len-needle_len); i++) {
+    if (
+      (haystack[0] == needle[0]) &&
+      (0 == strncmp(haystack, needle, needle_len))
+    ) {
+      return (char *)haystack;
+    }
+    haystack++;
+  }
+
+  return NULL;
+}
diff --git a/src/strnstr.h b/src/strnstr.h
@@ -0,0 +1,3 @@
+#include <stdlib.h>
+
+char *strnstr(const char *haystack, const char *needle, size_t len);