/*-*- 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 │ │ │ │ This program is free software; you can redistribute it and/or modify │ │ it under the terms of the GNU General Public License as published by │ │ the Free Software Foundation; version 2 of the License. │ │ │ │ This program is distributed in the hope that it will be useful, but │ │ WITHOUT ANY WARRANTY; without even the implied warranty of │ │ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │ │ General Public License for more details. │ │ │ │ You should have received a copy of the GNU General Public License │ │ along with this program; if not, write to the Free Software │ │ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │ │ 02110-1301 USA │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/assert.h" #include "libc/errno.h" #include "libc/mem/mem.h" #include "libc/stdio/internal.h" #include "libc/stdio/stdio.h" #define GETDELIM_MAX 65536 /** * Reads string from stream. * * @param line is the caller's buffer (in/out) which is extended * automatically. *line may be NULL but only if *n is 0; * NUL-termination is guaranteed FTMP * @param n is the capacity of line (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 **line, size_t *n, int delim, FILE *f) { STATIC_YOINK("realloc"); assert((*line && *n) || (!*line && !*n)); ssize_t rc = -1; size_t i = 0; int c; for (;;) { if ((c = getc(f)) == -1) { if (ferror(f) == EINTR) continue; if (feof(f) && i) rc = i; break; } if (i + 2 >= *n && !grow(line, n, 1, 0)) { fseterrno(f); break; } if (((*line)[i++] = c) == delim) { rc = i; break; } } if (*line && i < *n) (*line)[i] = '\0'; return rc; }