third_party/ulib/musl/src/stdio/fwrite.c

#include "stdio_impl.h"
#include <string.h>

size_t __fwritex(const unsigned char* restrict s, size_t l, FILE* restrict f) {
    size_t i = 0;

    if (!f->wend && __towrite(f))
        return 0;

    if (l > f->wend - f->wpos)
        return f->write(f, s, l);

    if (f->lbf >= 0) {
        /* Match /^(.*\n|)/ */
        for (i = l; i && s[i - 1] != '\n'; i--)
            ;
        if (i) {
            size_t n = f->write(f, s, i);
            if (n < i)
                return n;
            s += i;
            l -= i;
        }
    }

    memcpy(f->wpos, s, l);
    f->wpos += l;
    return l + i;
}

size_t fwrite(const void* restrict src, size_t size, size_t nmemb, FILE* restrict f) {
    size_t k, l = size * nmemb;
    if (!size)
        nmemb = 0;
    FLOCK(f);
    k = __fwritex(src, l, f);
    FUNLOCK(f);
    return k == l ? nmemb : k / size;
}

weak_alias(fwrite, fwrite_unlocked);