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#include "stdio_impl.h"
#include <string.h>
#define MIN(a,b) ((a)<(b) ? (a) : (b))
char *fgets(char *restrict s, int n, FILE *restrict f)
{
char *p = s;
unsigned char *z;
size_t k;
int c;
FLOCK(f);
if (n--<=1) {
f->mode |= f->mode-1;
FUNLOCK(f);
if (n) return 0;
*s = 0;
return s;
}
while (n) {
if (f->rpos != f->rend) {
z = memchr(f->rpos, '\n', f->rend - f->rpos);
k = z ? z - f->rpos + 1 : f->rend - f->rpos;
k = MIN(k, n);
memcpy(p, f->rpos, k);
f->rpos += k;
p += k;
n -= k;
if (z || !n) break;
}
if ((c = getc_unlocked(f)) < 0) {
if (p==s || !feof(f)) s = 0;
break;
}
n--;
if ((*p++ = c) == '\n') break;
}
if (s) *p = 0;
FUNLOCK(f);
return s;
}
weak_alias(fgets, fgets_unlocked);
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