156 lines
4.3 KiB
C
156 lines
4.3 KiB
C
/*-
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* Copyright (c) 2003 Networks Associates Technology, Inc.
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* Copyright (c) 2004-2007 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by ThinkSec AS and
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* Network Associates Laboratories, the Security Research Division of
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* Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <security/pam_appl.h>
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#include "openpam_impl.h"
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#define MIN_LINE_LENGTH 128
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/*
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* OpenPAM extension
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*
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* Read a line from a file.
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*/
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char *
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openpam_readline(FILE *f, int *lineno, size_t *lenp)
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{
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char *line;
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size_t len, size;
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int ch;
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if ((line = malloc(MIN_LINE_LENGTH)) == NULL)
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return (NULL);
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size = MIN_LINE_LENGTH;
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len = 0;
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#define line_putch(ch) do { \
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if (len >= size - 1) { \
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char *tmp = realloc(line, size *= 2); \
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if (tmp == NULL) \
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goto fail; \
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line = tmp; \
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} \
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line[len++] = ch; \
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line[len] = '\0'; \
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} while (0)
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for (;;) {
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ch = fgetc(f);
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/* strip comment */
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if (ch == '#') {
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do {
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ch = fgetc(f);
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} while (ch != EOF && ch != '\n');
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}
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/* eof */
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if (ch == EOF) {
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/* remove trailing whitespace */
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while (len > 0 && isspace((int)line[len - 1]))
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--len;
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line[len] = '\0';
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if (len == 0)
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goto fail;
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break;
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}
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/* eol */
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if (ch == '\n') {
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if (lineno != NULL)
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++*lineno;
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/* remove trailing whitespace */
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while (len > 0 && isspace((int)line[len - 1]))
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--len;
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line[len] = '\0';
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/* skip blank lines */
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if (len == 0)
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continue;
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/* continuation */
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if (line[len - 1] == '\\') {
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line[--len] = '\0';
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/* fall through to whitespace case */
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} else {
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break;
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}
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}
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/* whitespace */
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if (isspace(ch)) {
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/* ignore leading whitespace */
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/* collapse linear whitespace */
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if (len > 0 && line[len - 1] != ' ')
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line_putch(' ');
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continue;
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}
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/* anything else */
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line_putch(ch);
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}
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if (lenp != NULL)
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*lenp = len;
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return (line);
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fail:
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FREE(line);
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return (NULL);
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}
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/**
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* The =openpam_readline function reads a line from a file, and returns it
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* in a NUL-terminated buffer allocated with =malloc.
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*
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* The =openpam_readline function performs a certain amount of processing
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* on the data it reads.
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* Comments (introduced by a hash sign) are stripped, as is leading and
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* trailing whitespace.
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* Any amount of linear whitespace is collapsed to a single space.
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* Blank lines are ignored.
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* If a line ends in a backslash, the backslash is stripped and the next
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* line is appended.
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*
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* If =lineno is not =NULL, the integer variable it points to is
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* incremented every time a newline character is read.
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*
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* If =lenp is not =NULL, the length of the line (not including the
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* terminating NUL character) is stored in the variable it points to.
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*
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* The caller is responsible for releasing the returned buffer by passing
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* it to =free.
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*/
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