source: openpam/trunk/lib/openpam_readline.c @ 408

Last change on this file since 408 was 408, checked in by Dag-Erling Smørgrav, 12 years ago

Update copyright.

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File size: 4.3 KB
Line 
1/*-
2 * Copyright (c) 2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2007 Dag-Erling Smørgrav
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by ThinkSec AS and
7 * Network Associates Laboratories, the Security Research Division of
8 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
9 * ("CBOSS"), as part of the DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $Id: openpam_readline.c 408 2007-12-21 11:36:24Z des $
36 */
37
38#include <ctype.h>
39#include <stdio.h>
40#include <stdlib.h>
41
42#include <security/pam_appl.h>
43#include "openpam_impl.h"
44
45#define MIN_LINE_LENGTH 128
46
47/*
48 * OpenPAM extension
49 *
50 * Read a line from a file.
51 */
52
53char *
54openpam_readline(FILE *f, int *lineno, size_t *lenp)
55{
56        char *line;
57        size_t len, size;
58        int ch;
59
60        if ((line = malloc(MIN_LINE_LENGTH)) == NULL)
61                return (NULL);
62        size = MIN_LINE_LENGTH;
63        len = 0;
64
65#define line_putch(ch) do { \
66        if (len >= size - 1) { \
67                char *tmp = realloc(line, size *= 2); \
68                if (tmp == NULL) \
69                        goto fail; \
70                line = tmp; \
71        } \
72        line[len++] = ch; \
73        line[len] = '\0'; \
74} while (0)
75
76        for (;;) {
77                ch = fgetc(f);
78                /* strip comment */
79                if (ch == '#') {
80                        do {
81                                ch = fgetc(f);
82                        } while (ch != EOF && ch != '\n');
83                }
84                /* eof */
85                if (ch == EOF) {
86                        /* remove trailing whitespace */
87                        while (len > 0 && isspace((int)line[len - 1]))
88                                --len;
89                        line[len] = '\0';
90                        if (len == 0)
91                                goto fail;
92                        break;
93                }
94                /* eol */
95                if (ch == '\n') {
96                        if (lineno != NULL)
97                                ++*lineno;
98
99                        /* remove trailing whitespace */
100                        while (len > 0 && isspace((int)line[len - 1]))
101                                --len;
102                        line[len] = '\0';
103                        /* skip blank lines */
104                        if (len == 0)
105                                continue;
106                        /* continuation */
107                        if (line[len - 1] == '\\') {
108                                line[--len] = '\0';
109                                /* fall through to whitespace case */
110                        } else {
111                                break;
112                        }
113                }
114                /* whitespace */
115                if (isspace(ch)) {
116                        /* ignore leading whitespace */
117                        /* collapse linear whitespace */
118                        if (len > 0 && line[len - 1] != ' ')
119                                line_putch(' ');
120                        continue;
121                }
122                /* anything else */
123                line_putch(ch);
124        }
125
126        if (lenp != NULL)
127                *lenp = len;
128        return (line);
129 fail:
130        FREE(line);
131        return (NULL);
132}
133
134/**
135 * The =openpam_readline function reads a line from a file, and returns it
136 * in a NUL-terminated buffer allocated with =malloc.
137 *
138 * The =openpam_readline function performs a certain amount of processing
139 * on the data it reads.
140 * Comments (introduced by a hash sign) are stripped, as is leading and
141 * trailing whitespace.
142 * Any amount of linear whitespace is collapsed to a single space.
143 * Blank lines are ignored.
144 * If a line ends in a backslash, the backslash is stripped and the next
145 * line is appended.
146 *
147 * If =lineno is not =NULL, the integer variable it points to is
148 * incremented every time a newline character is read.
149 *
150 * If =lenp is not =NULL, the length of the line (not including the
151 * terminating NUL character) is stored in the variable it points to.
152 *
153 * The caller is responsible for releasing the returned buffer by passing
154 * it to =free.
155 */
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