1#include "stdio_impl.h"
2#include <string.h>
3#include <stdlib.h>
4#include <inttypes.h>
5#include <errno.h>
6
7ssize_t getdelim(char **restrict s, size_t *restrict n, int delim, FILE *restrict f)
8{
9 char *tmp;
10 unsigned char *z;
11 size_t k;
12 size_t i=0;
13 int c;
14
15 FLOCK(f);
16
17 if (!n || !s) {
18 f->mode |= f->mode-1;
19 f->flags |= F_ERR;
20 FUNLOCK(f);
21 errno = EINVAL;
22 return -1;
23 }
24
25 if (!*s) *n=0;
26
27 for (;;) {
28 if (f->rpos != f->rend) {
29 z = memchr(f->rpos, delim, f->rend - f->rpos);
30 k = z ? z - f->rpos + 1 : f->rend - f->rpos;
31 } else {
32 z = 0;
33 k = 0;
34 }
35 if (i+k >= *n) {
36 size_t m = i+k+2;
37 if (!z && m < SIZE_MAX/4) m += m/2;
38 tmp = realloc(*s, m);
39 if (!tmp) {
40 m = i+k+2;
41 tmp = realloc(*s, m);
42 if (!tmp) {
43 /* Copy as much as fits and ensure no
44 * pushback remains in the FILE buf. */
45 k = *n-i;
46 memcpy(*s+i, f->rpos, k);
47 f->rpos += k;
48 f->mode |= f->mode-1;
49 f->flags |= F_ERR;
50 FUNLOCK(f);
51 errno = ENOMEM;
52 return -1;
53 }
54 }
55 *s = tmp;
56 *n = m;
57 }
58 if (k) {
59 memcpy(*s+i, f->rpos, k);
60 f->rpos += k;
61 i += k;
62 }
63 if (z) break;
64 if ((c = getc_unlocked(f)) == EOF) {
65 if (!i || !feof(f)) {
66 FUNLOCK(f);
67 return -1;
68 }
69 break;
70 }
71 /* If the byte read by getc won't fit without growing the
72 * output buffer, push it back for next iteration. */
73 if (i+1 >= *n) *--f->rpos = c;
74 else if (((*s)[i++] = c) == delim) break;
75 }
76 (*s)[i] = 0;
77
78 FUNLOCK(f);
79
80 return i;
81}
82
83weak_alias(getdelim, __getdelim);