mirror of
https://github.com/jart/cosmopolitan.git
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73 lines
3.1 KiB
C
73 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/macros.internal.h"
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#include "libc/stdio/internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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/**
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* Reads line from stream.
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*
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* This function is similar to getline() except it'll truncate lines
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* exceeding size. The line ending marker is included and may be removed
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* using chomp().
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*
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* @param s is output buffer
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* @param size is capacity of s
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* @param f is non-null file object stream pointer
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* @return s on success, NULL on error, or NULL if EOF happens when
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* zero characters have been read
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*/
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char *fgets_unlocked(char *s, int size, FILE *f) {
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int c, n;
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char *p, *b, *t;
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p = s;
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if (size > 0) {
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while (--size > 0) {
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if (!IsTiny() && f->beg < f->end) {
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b = f->buf + f->beg;
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n = MIN(f->end - f->beg, size);
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if ((t = memchr(b, '\n', n))) {
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n = t + 1 - b;
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}
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if (n)
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memcpy(p, b, n);
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f->beg += n;
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size -= n - 1;
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p += n;
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if (t)
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break;
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} else {
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if ((c = fgetc_unlocked(f)) == -1) {
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break;
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}
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*p++ = c & 255;
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if (c == '\n')
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break;
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}
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}
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if (p > s || f->state != -1) {
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*p = '\0';
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}
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}
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return p > s ? s : NULL;
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}
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