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/*-*- 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 2020 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/assert.h"
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/macros.internal.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/o.h"
/**
* Reads string from stream.
*
* @param s is the caller's buffer (in/out) which is extended or
* allocated automatically, also NUL-terminated is guaranteed
* @param n is the capacity of s (in/out)
* @param delim is the stop char (and NUL is implicitly too)
* @return number of bytes read, including delim, excluding NUL, or -1
* w/ errno on EOF or error; see ferror() and feof()
* @note this function can't punt EINTR to caller
* @see getline(), gettok_r()
*/
ssize_t getdelim(char **s, size_t *n, int delim, FILE *f) {
char *p;
ssize_t rc;
size_t i, m;
if ((f->iomode & O_ACCMODE) == O_WRONLY) {
f->state = errno = EBADF;
return -1;
}
if (f->beg > f->end || f->bufmode == _IONBF) {
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 && !(*s = realloc(*s, (*n = i + m + 1)))) abort();
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;
}
}
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