mirror of
https://github.com/jart/cosmopolitan.git
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3e4fd4b0ad
This change also pays off some of the remaining technical debt with stdio, file descriptors, and memory managemnt polyfills.
64 lines
3.1 KiB
C
64 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 net 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/errno.h"
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#include "libc/mem/mem.h"
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#include "libc/stdio/internal.h"
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#include "libc/stdio/stdio.h"
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#define GETDELIM_MAX 65536
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/**
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* Reads string from stream.
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*
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* @param line is the caller's buffer (in/out) which is extended
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* automatically. *line may be NULL but only if *n is 0;
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* NUL-termination is guaranteed FTMP
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* @param n is the capacity of line (in/out)
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* @param delim is the stop char (and NUL is implicitly too)
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* @return number of bytes read, including delim, excluding NUL, or -1
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* w/ errno on EOF or error; see ferror() and feof()
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* @note this function can't punt EINTR to caller
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* @see getline(), gettok_r()
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*/
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ssize_t getdelim(char **line, size_t *n, int delim, FILE *f) {
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STATIC_YOINK("realloc");
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assert((*line && *n) || (!*line && !*n));
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ssize_t rc = -1;
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size_t i = 0;
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int c;
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for (;;) {
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if ((c = getc(f)) == -1) {
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if (ferror(f) == EINTR) continue;
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if (feof(f) && i) rc = i;
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break;
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}
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if (i + 2 >= *n && !__grow(line, n, 1, 0)) {
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__fseterrno(f);
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break;
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}
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if (((*line)[i++] = c) == delim) {
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rc = i;
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break;
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}
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}
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if (*line && i < *n) (*line)[i] = '\0';
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return rc;
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}
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