third_party/ulib/musl/src/string/strcasestr.c

#define _GNU_SOURCE
#include <string.h>

char* strcasestr(const char* h, const char* n) {
    size_t l = strlen(n);
    for (; *h; h++)
        if (!strncasecmp(h, n, l))
            return (char*)h;
    return 0;
}