file.c revision 241016 
1/*-
2 * Copyright (c) 1998-2011 Dag-Erling Sm��rgrav
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 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/9/lib/libfetch/file.c 241016 2012-09-28 01:04:09Z eadler $");
31
32#include <sys/param.h>
33#include <sys/stat.h>
34
35#include <dirent.h>
36#include <fcntl.h>
37#include <stdio.h>
38#include <string.h>
39
40#include "fetch.h"
41#include "common.h"
42
43FILE *
44fetchXGetFile(struct url *u, struct url_stat *us, const char *flags)
45{
46	FILE *f;
47
48	if (us && fetchStatFile(u, us, flags) == -1)
49		return (NULL);
50
51	f = fopen(u->doc, "r");
52
53	if (f == NULL) {
54		fetch_syserr();
55		return (NULL);
56	}
57
58	if (u->offset && fseeko(f, u->offset, SEEK_SET) == -1) {
59		fclose(f);
60		fetch_syserr();
61		return (NULL);
62	}
63
64	fcntl(fileno(f), F_SETFD, FD_CLOEXEC);
65	return (f);
66}
67
68FILE *
69fetchGetFile(struct url *u, const char *flags)
70{
71	return (fetchXGetFile(u, NULL, flags));
72}
73
74FILE *
75fetchPutFile(struct url *u, const char *flags)
76{
77	FILE *f;
78
79	if (CHECK_FLAG('a'))
80		f = fopen(u->doc, "a");
81	else
82		f = fopen(u->doc, "w+");
83
84	if (f == NULL) {
85		fetch_syserr();
86		return (NULL);
87	}
88
89	if (u->offset && fseeko(f, u->offset, SEEK_SET) == -1) {
90		fclose(f);
91		fetch_syserr();
92		return (NULL);
93	}
94
95	fcntl(fileno(f), F_SETFD, FD_CLOEXEC);
96	return (f);
97}
98
99static int
100fetch_stat_file(const char *fn, struct url_stat *us)
101{
102	struct stat sb;
103
104	us->size = -1;
105	us->atime = us->mtime = 0;
106	if (stat(fn, &sb) == -1) {
107		fetch_syserr();
108		return (-1);
109	}
110	us->size = sb.st_size;
111	us->atime = sb.st_atime;
112	us->mtime = sb.st_mtime;
113	return (0);
114}
115
116int
117fetchStatFile(struct url *u, struct url_stat *us, const char *flags __unused)
118{
119	return (fetch_stat_file(u->doc, us));
120}
121
122struct url_ent *
123fetchListFile(struct url *u, const char *flags __unused)
124{
125	struct dirent *de;
126	struct url_stat us;
127	struct url_ent *ue;
128	int size, len;
129	char fn[PATH_MAX], *p;
130	DIR *dir;
131	int l;
132
133	if ((dir = opendir(u->doc)) == NULL) {
134		fetch_syserr();
135		return (NULL);
136	}
137
138	ue = NULL;
139	strncpy(fn, u->doc, sizeof(fn) - 2);
140	fn[sizeof(fn) - 2] = 0;
141	strcat(fn, "/");
142	p = strchr(fn, 0);
143	l = sizeof(fn) - strlen(fn) - 1;
144
145	while ((de = readdir(dir)) != NULL) {
146		strncpy(p, de->d_name, l - 1);
147		p[l - 1] = 0;
148		if (fetch_stat_file(fn, &us) == -1)
149			/* should I return a partial result, or abort? */
150			break;
151		fetch_add_entry(&ue, &size, &len, de->d_name, &us);
152	}
153
154	return (ue);
155}
156