mirror of
https://github.com/jart/cosmopolitan.git
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c776a32f75
This change might cause ABI breakages for /opt/cosmos. It's needed to help us better conform to header declaration practices.
57 lines
2.9 KiB
C
57 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 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/stdio/internal.h"
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#include "libc/stdio/lock.internal.h"
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#include "libc/stdio/stdio.h"
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/**
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* Retrieves line from stream, e.g.
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*
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* char *line;
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* while ((line = chomp(fgetln(stdin, 0)))) {
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* printf("%s\n", line);
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* }
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*
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* The returned memory is owned by the stream. It'll be reused when
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* fgetln() is called again. It's free()'d upon fclose() / fflush()
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*
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* When reading from the console on Windows in `ICANON` mode, the
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* returned line will end with `\r\n` rather than `\n`.
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*
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* @param stream specifies non-null open input stream
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* @param len optionally receives byte length of line
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* @return nul-terminated line string, including the `\n` character
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* unless a line happened before EOF without `\n`, otherwise it
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* returns `NULL` and feof() and ferror() can examine the state
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* @see getdelim()
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*/
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char *fgetln(FILE *stream, size_t *len) {
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char *res;
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ssize_t rc;
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size_t n = 0;
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flockfile(stream);
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if ((rc = getdelim_unlocked(&stream->getln, &n, '\n', stream)) > 0) {
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if (len) *len = rc;
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res = stream->getln;
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} else {
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res = 0;
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}
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funlockfile(stream);
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return res;
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}
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