source: openpam/trunk/lib/libpam/openpam_readlinev.c @ 648

Last change on this file since 648 was 648, checked in by Dag-Erling Smørgrav, 8 years ago

prop sweep

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 4.9 KB
Line 
1/*-
2 * Copyright (c) 2012 Dag-Erling Smørgrav
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote
14 *    products derived from this software without specific prior written
15 *    permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $Id: openpam_readlinev.c 648 2013-03-05 17:54:27Z des $
30 */
31
32#ifdef HAVE_CONFIG_H
33# include "config.h"
34#endif
35
36#include <errno.h>
37#include <stdio.h>
38#include <stdlib.h>
39
40#include <security/pam_appl.h>
41
42#include "openpam_impl.h"
43
44#define MIN_WORDV_SIZE  32
45
46/*
47 * OpenPAM extension
48 *
49 * Read a line from a file and split it into words.
50 */
51
52char **
53openpam_readlinev(FILE *f, int *lineno, int *lenp)
54{
55        char *word, **wordv, **tmp;
56        size_t wordlen, wordvsize;
57        int ch, serrno, wordvlen;
58
59        wordvsize = MIN_WORDV_SIZE;
60        wordvlen = 0;
61        if ((wordv = malloc(wordvsize * sizeof *wordv)) == NULL) {
62                openpam_log(PAM_LOG_ERROR, "malloc(): %m");
63                errno = ENOMEM;
64                return (NULL);
65        }
66        wordv[wordvlen] = NULL;
67        while ((word = openpam_readword(f, lineno, &wordlen)) != NULL) {
68                if ((unsigned int)wordvlen + 1 >= wordvsize) {
69                        /* need to expand the array */
70                        wordvsize *= 2;
71                        tmp = realloc(wordv, wordvsize * sizeof *wordv);
72                        if (tmp == NULL) {
73                                openpam_log(PAM_LOG_ERROR, "malloc(): %m");
74                                errno = ENOMEM;
75                                break;
76                        }
77                        wordv = tmp;
78                }
79                /* insert our word */
80                wordv[wordvlen++] = word;
81                wordv[wordvlen] = NULL;
82        }
83        if (errno != 0) {
84                /* I/O error or out of memory */
85                serrno = errno;
86                while (wordvlen--)
87                        free(wordv[wordvlen]);
88                free(wordv);
89                errno = serrno;
90                return (NULL);
91        }
92        /* assert(!ferror(f)) */
93        ch = fgetc(f);
94        /* assert(ch == EOF || ch == '\n') */
95        if (ch == EOF && wordvlen == 0) {
96                free(wordv);
97                return (NULL);
98        }
99        if (ch == '\n' && lineno != NULL)
100                ++*lineno;
101        if (lenp != NULL)
102                *lenp = wordvlen;
103        return (wordv);
104}
105
106/**
107 * The =openpam_readlinev function reads a line from a file, splits it
108 * into words according to the rules described in the =openpam_readword
109 * manual page, and returns a list of those words.
110 *
111 * If =lineno is not =NULL, the integer variable it points to is
112 * incremented every time a newline character is read.
113 * This includes quoted or escaped newline characters and the newline
114 * character at the end of the line.
115 *
116 * If =lenp is not =NULL, the number of words on the line is stored in the
117 * variable to which it points.
118 *
119 * RETURN VALUES
120 *
121 * If successful, the =openpam_readlinev function returns a pointer to a
122 * dynamically allocated array of pointers to individual dynamically
123 * allocated NUL-terminated strings, each containing a single word, in the
124 * order in which they were encountered on the line.
125 * The array is terminated by a =NULL pointer.
126 *
127 * The caller is responsible for freeing both the array and the individual
128 * strings by passing each of them to =!free.
129 *
130 * If the end of the line was reached before any words were read,
131 * =openpam_readlinev returns a pointer to a dynamically allocated array
132 * containing a single =NULL pointer.
133 *
134 * The =openpam_readlinev function can fail and return =NULL for one of
135 * four reasons:
136 *
137 *  - The end of the file was reached before any words were read; :errno is
138 *    zero, =!ferror returns zero, and =!feof returns a non-zero value.
139 *
140 *  - The end of the file was reached while a quote or backslash escape
141 *    was in effect; :errno is set to =EINVAL, =!ferror returns zero, and
142 *    =!feof returns a non-zero value.
143 *
144 *  - An error occurred while reading from the file; :errno is non-zero,
145 *    =!ferror returns a non-zero value and =!feof returns zero.
146 *
147 *  - A =!malloc or =!realloc call failed; :errno is set to =ENOMEM,
148 *    =!ferror returns a non-zero value, and =!feof may or may not return
149 *    a non-zero value.
150 *
151 * >openpam_readline
152 * >openpam_readword
153 *
154 * AUTHOR DES
155 */
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