summaryrefslogtreecommitdiff
path: root/src/regex/glob.c
blob: 9a70f0bc20911c441a660e4535deb6682154d8ea (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
#include <glob.h>
#include <fnmatch.h>
#include <sys/stat.h>
#include <dirent.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <stddef.h>
#include <unistd.h>
#include <stdio.h>
#include "libc.h"

struct match
{
	struct match *next;
	char name[1];
};

static int is_literal(const char *p, int useesc)
{
	int bracket = 0;
	for (; *p; p++) {
		switch (*p) {
		case '\\':
			if (!useesc) break;
		case '?':
		case '*':
			return 0;
		case '[':
			bracket = 1;
			break;
		case ']':
			if (bracket) return 0;
			break;
		}
	}
	return 1;
}

static int append(struct match **tail, const char *name, size_t len, int mark)
{
	struct match *new = malloc(sizeof(struct match) + len + 1);
	if (!new) return -1;
	(*tail)->next = new;
	new->next = NULL;
	strcpy(new->name, name);
	if (mark) strcat(new->name, "/");
	*tail = new;
	return 0;
}

static int match_in_dir(const char *d, const char *p, int flags, int (*errfunc)(const char *path, int err), struct match **tail)
{
	DIR *dir;
	long long de_buf[(sizeof(struct dirent) + NAME_MAX + sizeof(long long))/sizeof(long long)];
	struct dirent *de;
	char pat[strlen(p)+1];
	char *p2;
	size_t l = strlen(d);
	int literal;
	int fnm_flags= ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0) | FNM_PERIOD;
	int error;

	if ((p2 = strchr(p, '/'))) {
		strcpy(pat, p);
		pat[p2-p] = 0;
		for (; *p2 == '/'; p2++);
		p = pat;
	}
	literal = is_literal(p, !(flags & GLOB_NOESCAPE));
	if (*d == '/' && !*(d+1)) l = 0;

	/* rely on opendir failing for nondirectory objects */
	dir = opendir(*d ? d : ".");
	error = errno;
	if (!dir) {
		/* this is not an error -- we let opendir call stat for us */
		if (error == ENOTDIR) return 0;
		if (error == EACCES && !*p) {
			struct stat st;
			if (!stat(d, &st) && S_ISDIR(st.st_mode)) {
				if (append(tail, d, l, l))
					return GLOB_NOSPACE;
				return 0;
			}
		}
		if (errfunc(d, error) || (flags & GLOB_ERR))
			return GLOB_ABORTED;
		return 0;
	}
	if (!*p) {
		error = append(tail, d, l, l) ? GLOB_NOSPACE : 0;
		closedir(dir);
		return error;
	}
	while (!(error = readdir_r(dir, (void *)de_buf, &de)) && de) {
		char namebuf[l+de->d_reclen+2], *name = namebuf;
		if (!literal && fnmatch(p, de->d_name, fnm_flags))
			continue;
		if (literal && strcmp(p, de->d_name))
			continue;
		if (p2 && de->d_type && !S_ISDIR(de->d_type<<12) && !S_ISLNK(de->d_type<<12))
			continue;
		if (*d) {
			memcpy(name, d, l);
			name[l] = '/';
			strcpy(name+l+1, de->d_name);
		} else {
			name = de->d_name;
		}
		if (p2) {
			if ((error = match_in_dir(name, p2, flags, errfunc, tail))) {
				closedir(dir);
				return error;
			}
		} else {
			int mark = 0;
			if (flags & GLOB_MARK) {
				if (de->d_type)
					mark = S_ISDIR(de->d_type<<12);
				else {
					struct stat st;
					stat(name, &st);
					mark = S_ISDIR(st.st_mode);
				}
			}
			if (append(tail, name, l+de->d_reclen+1, mark)) {
				closedir(dir);
				return GLOB_NOSPACE;
			}
		}
	}
	closedir(dir);
	if (error && (errfunc(d, error) || (flags & GLOB_ERR)))
		return GLOB_ABORTED;
	return 0;
}

static int ignore_err(const char *path, int err)
{
	return 0;
}

static void freelist(struct match *head)
{
	struct match *match, *next;
	for (match=head->next; match; match=next) {
		next = match->next;
		free(match);
	}
}

static int sort(const void *a, const void *b)
{
	return strcmp(*(const char **)a, *(const char **)b);
}

int glob(const char *pat, int flags, int (*errfunc)(const char *path, int err), glob_t *g)
{
	const char *p=pat, *d;
	struct match head = { .next = NULL }, *tail = &head;
	size_t cnt, i;
	size_t offs = (flags & GLOB_DOOFFS) ? g->gl_offs : 0;
	int error = 0;
	
	if (*p == '/') {
		for (; *p == '/'; p++);
		d = "/";
	} else {
		d = "";
	}

	if (!errfunc) errfunc = ignore_err;

	if (!(flags & GLOB_APPEND)) {
		g->gl_offs = offs;
		g->gl_pathc = 0;
		g->gl_pathv = NULL;
	}

	if (*p) error = match_in_dir(d, p, flags, errfunc, &tail);
	if (error == GLOB_NOSPACE) {
		freelist(&head);
		return error;
	}
	
	for (cnt=0, tail=head.next; tail; tail=tail->next, cnt++);
	if (!cnt) {
		if (flags & GLOB_NOCHECK) {
			tail = &head;
			if (append(&tail, pat, strlen(pat), 0))
				return GLOB_NOSPACE;
			cnt++;
		} else
			return GLOB_NOMATCH;
	}

	if (flags & GLOB_APPEND) {
		char **pathv = realloc(g->gl_pathv, (offs + g->gl_pathc + cnt + 1) * sizeof(char *));
		if (!pathv) {
			freelist(&head);
			return GLOB_NOSPACE;
		}
		g->gl_pathv = pathv;
		offs += g->gl_pathc;
	} else {
		g->gl_pathv = malloc((offs + cnt + 1) * sizeof(char *));
		if (!g->gl_pathv) {
			freelist(&head);
			return GLOB_NOSPACE;
		}
		for (i=0; i<offs; i++)
			g->gl_pathv[i] = NULL;
	}
	for (i=0, tail=head.next; i<cnt; tail=tail->next, i++)
		g->gl_pathv[offs + i] = tail->name;
	g->gl_pathv[offs + i] = NULL;
	g->gl_pathc += cnt;

	if (!(flags & GLOB_NOSORT))
		qsort(g->gl_pathv+offs, cnt, sizeof(char *), sort);
	
	return error;
}

void globfree(glob_t *g)
{
	size_t i;
	for (i=0; i<g->gl_pathc; i++)
		free(g->gl_pathv[g->gl_offs + i] - offsetof(struct match, name));
	free(g->gl_pathv);
	g->gl_pathc = 0;
	g->gl_pathv = NULL;
}

LFS64(glob);
LFS64(globfree);