1/* $OpenBSD: file.c,v 1.11 2010/07/02 20:48:48 nicm Exp $ */
2
3/*-
4 * Copyright (c) 1999 James Howard and Dag-Erling Co�dan Sm�rgrav
5 * Copyright (C) 2008-2009 Gabor Kovesdan <gabor@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without

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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
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: head/usr.bin/grep/file.c 210389 2010-07-22 19:11:57Z gabor $");
32
33#include <sys/param.h>
34#include <sys/types.h>
35#include <sys/stat.h>
36
37#include <bzlib.h>
38#include <err.h>
39#include <errno.h>

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62
63#define iswbinary(ch) (!iswspace((ch)) && iswcntrl((ch)) && \
64 (ch != L'\b') && (ch != L'\0'))
65
66/*
67 * Returns a single character according to the file type.
68 * Returns -1 on failure.
69 */
70int
71grep_fgetc(struct file *f)
72{
73 unsigned char c;
74
75 switch (filebehave) {
76 case FILE_STDIO:
77 return (fgetc(f->f));
78 case FILE_GZIP:
79 return (gzgetc(f->gzf));
80 case FILE_BZIP:
81 BZ2_bzRead(&bzerr, f->bzf, &c, 1);
82 if (bzerr == BZ_STREAM_END)
83 return (-1);
84 else if (bzerr != BZ_SEQUENCE_ERROR && bzerr != BZ_OK)
85 errx(2, "%s", getstr(2));
86 return (c);
87 }
88 return (-1);
89}
90
91/*
92 * Returns true if the file position is a EOF, returns false
93 * otherwise.
94 */
95int
96grep_feof(struct file *f)
97{
98
99 switch (filebehave) {
100 case FILE_STDIO:
101 return (feof(f->f));
102 case FILE_GZIP:
103 return (gzeof(f->gzf));
104 case FILE_BZIP:
105 return (bzerr == BZ_STREAM_END);
106 }
107 return (1);
108}
109

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126 if (binbufptr == NULL) {
127
128 /* Only pre-read to the buffer if we need the binary check. */
129 if (binbehave != BINFILE_TEXT) {
130 if (f->stdin)
131 st.st_size = MAXBUFSIZ;
132 else if (stat(fname, &st) != 0)
133 err(2, NULL);
134
135 bufsiz = (MAXBUFSIZ > (st.st_size * PREREAD_M)) ?
136 (st.st_size / 2) : MAXBUFSIZ;
137
138 binbuf = grep_malloc(sizeof(char) * bufsiz);
139
140 while (i < bufsiz) {
141 ch = grep_fgetc(f);
142 if (ch == EOF)
143 break;
144 binbuf[i++] = ch;
145 }
146
147 f->binary = memchr(binbuf, (filebehave != FILE_GZIP) ?
148 '\0' : '\200', i - 1) != NULL;
149 }
150 binbufsiz = i;
151 binbufptr = binbuf;
152 }

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179/*
180 * Opens the standard input for processing.
181 */
182struct file *
183grep_stdin_open(void)
184{
185 struct file *f;
186
187 snprintf(fname, sizeof fname, "%s", getstr(1));
188
189 f = grep_malloc(sizeof *f);
190
191 if ((f->f = fdopen(STDIN_FILENO, "r")) != NULL) {
192 f->stdin = true;
193 return (f);
194 }
195
196 free(f);
197 return (NULL);
198}
199

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204grep_open(const char *path)
205{
206 struct file *f;
207
208 snprintf(fname, sizeof fname, "%s", path);
209
210 f = grep_malloc(sizeof *f);
211
212 f->stdin = false;
213 switch (filebehave) {
214 case FILE_STDIO:
215 if ((f->f = fopen(path, "r")) != NULL)
216 return (f);
217 break;
218 case FILE_GZIP:
219 if ((f->gzf = gzopen(fname, "r")) != NULL)
220 return (f);
221 break;
222 case FILE_BZIP:
223 if ((f->bzf = BZ2_bzopen(fname, "r")) != NULL)
224 return (f);

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233 * Closes a normal, a gzipped or a bzip2 compressed file.
234 */
235void
236grep_close(struct file *f)
237{
238
239 switch (filebehave) {
240 case FILE_STDIO:
241 fclose(f->f);
242 break;
243 case FILE_GZIP:
244 gzclose(f->gzf);
245 break;
246 case FILE_BZIP:
247 BZ2_bzclose(f->bzf);
248 break;
249 }
250
251 /* Reset read buffer for the file we are closing */
252 binbufptr = NULL;
253 free(binbuf);
254
255}