121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/*
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* Copyright (c) 2011 James E. Ingram
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* Copyright (c) 2024 Heimdal Project
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/*
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* Implementation of the getdelim() function from POSIX 2008.
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*
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* getdelim() reads from a stream until a specified delimiter is encountered.
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*
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* See: http://pubs.opengroup.org/onlinepubs/9699919799/functions/getdelim.html
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*
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* NOTE: It is always the caller's responsibility to free the line buffer, even
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* when an error occurs.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include "roken.h"
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#ifndef SSIZE_MAX
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#define SSIZE_MAX ((ssize_t)(SIZE_MAX / 2))
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#endif
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#define GETDELIM_MINLEN 16 /* minimum line buffer size */
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#define GETDELIM_MAXLEN 65536 /* maximum line buffer size */
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#ifndef HAVE_GETDELIM
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ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
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getdelim(char **lineptr, size_t *n, int delimiter, FILE *stream)
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{
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char *buf, *pos;
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int c;
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ssize_t bytes;
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size_t read;
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if (lineptr == NULL || n == NULL) {
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errno = EINVAL;
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return -1;
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}
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if (stream == NULL) {
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errno = EBADF;
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return -1;
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}
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/* read characters until delimiter is found, end of file is reached, or an
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error occurs. */
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read = 0;
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bytes = 0;
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buf = *lineptr;
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pos = buf;
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while ((c = getc(stream)) != EOF) {
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if (bytes + 1 >= SSIZE_MAX) {
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errno = ERANGE;
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return -1;
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}
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read++;
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bytes++;
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if (*n < GETDELIM_MINLEN || read >= *n - 2 /* 1 for the delimiter, one for a NUL */) {
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size_t newsz = *n + (GETDELIM_MINLEN + ((*n) >> 1));
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/*
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* Better than an overflow check like (size_t)SSIZE_MAX - newsz <
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* newsz. Obviously we assume larger than 16-bit architectures.
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*/
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if (newsz > GETDELIM_MAXLEN) {
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errno = ERANGE;
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return -1;
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}
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buf = realloc(*lineptr, newsz);
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if (buf == NULL) {
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/* ENOMEM */
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return -1;
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}
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*n = newsz;
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pos = buf + bytes - 1;
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*lineptr = buf;
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}
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*pos++ = (char)c;
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if (c == delimiter) {
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*pos = '\0';
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return bytes;
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}
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}
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if (ferror(stream) || (feof(stream) && (bytes == 0))) {
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/* EOF, or an error from getc(). */
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return -1;
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}
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*pos = '\0';
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return bytes;
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}
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#endif /* !HAVE_GETDELIM */
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