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#include "stdio_impl.h"
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
#include <errno.h>
ssize_t getdelim(char **restrict s, size_t *restrict n, int delim, FILE *restrict f)
{
char *tmp;
unsigned char *z;
size_t k;
size_t i=0;
int c;
FLOCK(f);
if (!n || !s) {
f->mode |= f->mode-1;
f->flags |= F_ERR;
FUNLOCK(f);
errno = EINVAL;
return -1;
}
if (!*s) *n=0;
for (;;) {
if (f->rpos != f->rend) {
z = memchr(f->rpos, delim, f->rend - f->rpos);
k = z ? z - f->rpos + 1 : f->rend - f->rpos;
} else {
z = 0;
k = 0;
}
if (i+k >= *n) {
size_t m = i+k+2;
if (!z && m < SIZE_MAX/4) m += m/2;
tmp = realloc(*s, m);
if (!tmp) {
m = i+k+2;
tmp = realloc(*s, m);
if (!tmp) {
/* Copy as much as fits and ensure no
* pushback remains in the FILE buf. */
k = *n-i;
memcpy(*s+i, f->rpos, k);
f->rpos += k;
f->mode |= f->mode-1;
f->flags |= F_ERR;
FUNLOCK(f);
errno = ENOMEM;
return -1;
}
}
*s = tmp;
*n = m;
}
if (k) {
memcpy(*s+i, f->rpos, k);
f->rpos += k;
i += k;
}
if (z) break;
if ((c = getc_unlocked(f)) == EOF) {
if (!i || !feof(f)) {
FUNLOCK(f);
return -1;
}
break;
}
/* If the byte read by getc won't fit without growing the
* output buffer, push it back for next iteration. */
if (i+1 >= *n) *--f->rpos = c;
else if (((*s)[i++] = c) == delim) break;
}
(*s)[i] = 0;
FUNLOCK(f);
return i;
}
weak_alias(getdelim, __getdelim);
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