Introduce string/mem functions

native/src/crt0/misc.c

@@ -0,0 +1,63 @@
+#include <stdlib.h>
+#include <string.h>
+#include <libgen.h>
+#include <errno.h>
+
+// Source: bionic/libc/bionic/libgen.cpp
+static int __basename_r(const char *path, char* buffer, size_t buffer_size) {
+    const char *startp = NULL;
+    const char *endp = NULL;
+    int len;
+    int result;
+
+    // Empty or NULL string gets treated as ".".
+    if (path == NULL || *path == '\0') {
+        startp = ".";
+        len = 1;
+        goto Exit;
+    }
+
+    // Strip trailing slashes.
+    endp = path + strlen(path) - 1;
+    while (endp > path && *endp == '/') {
+        endp--;
+    }
+
+    // All slashes becomes "/".
+    if (endp == path && *endp == '/') {
+        startp = "/";
+        len = 1;
+        goto Exit;
+    }
+
+    // Find the start of the base.
+    startp = endp;
+    while (startp > path && *(startp - 1) != '/') {
+        startp--;
+    }
+
+    len = endp - startp +1;
+
+Exit:
+    result = len;
+    if (buffer == NULL) {
+        return result;
+    }
+    if (len > (int) buffer_size - 1) {
+        len = buffer_size - 1;
+        result = -1;
+        errno = ERANGE;
+    }
+
+    if (len >= 0) {
+        memcpy(buffer, startp, len);
+        buffer[len] = 0;
+    }
+    return result;
+}
+
+char *basename(const char *path) {
+    static char buf[4069];
+    int rc = __basename_r(path, buf, sizeof(buf));
+    return (rc < 0) ? NULL : buf;
+}