129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/* Implementations of the getdelim() and getline() functions from POSIX 2008,
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just in case your libc doesn't have them.
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getdelim() reads from a stream until a specified delimiter is encountered.
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getline() reads from a stream until a newline is encountered.
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See: http://pubs.opengroup.org/onlinepubs/9699919799/functions/getdelim.html
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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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Copyright (c) 2011 James E. Ingram
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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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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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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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#include <stddef.h>
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#include <stdio.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#if !HAVE_DECL_GETLINE
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ssize_t getline(char **lineptr, size_t *n, FILE *stream);
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#endif
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#ifndef SSIZE_MAX
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#define SSIZE_MAX 32767
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#endif
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#define _GETDELIM_GROWBY 4096 /* amount to grow line buffer by */
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#define _GETDELIM_MINLEN 4 /* minimum line buffer size */
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static ssize_t libedit_getdelim(char **restrict lineptr, size_t *restrict n, int delimiter,
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FILE *restrict 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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if (lineptr == NULL || n == NULL)
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{
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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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{
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errno = EBADF;
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return -1;
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}
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/* resize (or allocate) the line buffer if necessary */
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buf = *lineptr;
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if (buf == NULL || *n < _GETDELIM_MINLEN)
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{
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buf = realloc(*lineptr, _GETDELIM_GROWBY);
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if (buf == NULL)
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{
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/* ENOMEM */
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return -1;
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}
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*n = _GETDELIM_GROWBY;
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*lineptr = buf;
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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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bytes = 0;
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pos = buf;
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while ((c = getc(stream)) != EOF)
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{
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if (bytes + 1 >= SSIZE_MAX)
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{
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errno = ERANGE;
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return -1;
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}
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bytes++;
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if (bytes >= *n - 1)
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{
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buf = realloc(*lineptr, *n + _GETDELIM_GROWBY);
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if (buf == NULL)
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{
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/* ENOMEM */
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return -1;
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}
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*n += _GETDELIM_GROWBY;
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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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{
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break;
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}
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}
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if (ferror(stream) || (feof(stream) && (bytes == 0)))
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{
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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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ssize_t libedit_getline(char **restrict lineptr, size_t *restrict n,
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FILE *restrict stream)
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{
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return libedit_getdelim(lineptr, n, '\n', stream);
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}
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