github.com/afumu/libc@v0.0.6/musl/src/string/strcasestr.c (about)

     1  #define _GNU_SOURCE
     2  #include <string.h>
     3  
     4  char *strcasestr(const char *h, const char *n)
     5  {
     6  	size_t l = strlen(n);
     7  	for (; *h; h++) if (!strncasecmp(h, n, l)) return (char *)h;
     8  	return 0;
     9  }