cosmopolitan/libc/stdio/getdelim_unlocked.c
Justine Tunney 10fd8bdb70 Unbloat the build
This change resurrects ae5d06dc53
2022-08-11 00:15:29 -07:00

82 lines
3.1 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/mem/mem.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/o.h"
/**
* Reads string from unlocked stream.
* @see getdelim() for documentation
*/
ssize_t getdelim_unlocked(char **s, size_t *n, int delim, FILE *f) {
ssize_t rc;
char *p, *s2;
size_t i, m, n2;
if ((f->iomode & O_ACCMODE) == O_WRONLY) {
f->state = errno = EBADF;
return -1;
}
if (f->beg > f->end) {
f->state = errno = EINVAL;
return -1;
}
if (!*s) *n = 0;
for (i = 0;; i += m) {
m = f->end - f->beg;
if ((p = memchr(f->buf + f->beg, delim, m))) {
m = p + 1 - (f->buf + f->beg);
}
if (i + m + 1 > *n) {
n2 = i + m + 1;
s2 = realloc(*s, n2);
if (s2) {
*s = s2;
*n = n2;
} else {
f->state = errno;
return -1;
}
}
memcpy(*s + i, f->buf + f->beg, m);
(*s)[i + m] = '\0';
if ((f->beg += m) == f->end) {
f->beg = f->end = 0;
}
if (p) {
return i + m;
} else if (f->fd == -1) {
break;
} else if ((rc = read(f->fd, f->buf, f->size)) != -1) {
if (!rc) break;
f->end = rc;
} else if (errno != EINTR) {
f->state = errno;
return -1;
}
}
f->state = -1;
if (i + m) {
return i + m;
} else {
return -1;
}
}