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authorobrien <obrien@FreeBSD.org>2004-08-09 08:45:41 +0000
committerobrien <obrien@FreeBSD.org>2004-08-09 08:45:41 +0000
commitbda6cdf5897e5ebed7279aca3ea3387bddcb19b0 (patch)
treefa3b953aed2a4bff370cfcd813015e532403552e /contrib/file/funcs.c
parentf35360c37203a2efe4238a8ec8dd5c45cde0820b (diff)
downloadFreeBSD-src-bda6cdf5897e5ebed7279aca3ea3387bddcb19b0.zip
FreeBSD-src-bda6cdf5897e5ebed7279aca3ea3387bddcb19b0.tar.gz
Virgin import of Christos Zoulas's FILE 4.10.
*- file is now broken into a library containing and processing the magic and a consumer binary.
Diffstat (limited to 'contrib/file/funcs.c')
-rw-r--r--contrib/file/funcs.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/contrib/file/funcs.c b/contrib/file/funcs.c
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+/*
+ * Copyright (c) Christos Zoulas 2003.
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice immediately at the beginning of the file, without modification,
+ * this list of conditions, and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include "file.h"
+#include "magic.h"
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#ifndef lint
+FILE_RCSID("@(#)$Id: funcs.c,v 1.12 2004/06/04 14:40:20 christos Exp $")
+#endif /* lint */
+/*
+ * Like printf, only we print to a buffer and advance it.
+ */
+protected int
+file_printf(struct magic_set *ms, const char *fmt, ...)
+{
+ va_list ap;
+ size_t len;
+ char *buf;
+
+ va_start(ap, fmt);
+
+ if ((len = vsnprintf(ms->o.ptr, ms->o.len, fmt, ap)) >= ms->o.len) {
+ va_end(ap);
+ if ((buf = realloc(ms->o.buf, len + 1024)) == NULL) {
+ file_oomem(ms);
+ return -1;
+ }
+ ms->o.ptr = buf + (ms->o.ptr - ms->o.buf);
+ ms->o.buf = buf;
+ ms->o.len = ms->o.size - (ms->o.ptr - ms->o.buf);
+ ms->o.size = len + 1024;
+
+ va_start(ap, fmt);
+ len = vsnprintf(ms->o.ptr, ms->o.len, fmt, ap);
+ }
+ ms->o.ptr += len;
+ ms->o.len -= len;
+ va_end(ap);
+ return 0;
+}
+
+/*
+ * error - print best error message possible
+ */
+/*VARARGS*/
+protected void
+file_error(struct magic_set *ms, int error, const char *f, ...)
+{
+ va_list va;
+ /* Only the first error is ok */
+ if (ms->haderr)
+ return;
+ va_start(va, f);
+ (void)vsnprintf(ms->o.buf, ms->o.size, f, va);
+ va_end(va);
+ if (error > 0) {
+ size_t len = strlen(ms->o.buf);
+ (void)snprintf(ms->o.buf + len, ms->o.size - len, " (%s)",
+ strerror(error));
+ }
+ ms->haderr++;
+ ms->error = error;
+}
+
+
+protected void
+file_oomem(struct magic_set *ms)
+{
+ file_error(ms, errno, "cannot allocate memory");
+}
+
+protected void
+file_badseek(struct magic_set *ms)
+{
+ file_error(ms, errno, "error seeking");
+}
+
+protected void
+file_badread(struct magic_set *ms)
+{
+ file_error(ms, errno, "error reading");
+}
+
+#ifndef COMPILE_ONLY
+protected int
+file_buffer(struct magic_set *ms, const void *buf, size_t nb)
+{
+ int m;
+ /* try compression stuff */
+ if ((m = file_zmagic(ms, buf, nb)) == 0) {
+ /* Check if we have a tar file */
+ if ((m = file_is_tar(ms, buf, nb)) == 0) {
+ /* try tests in /etc/magic (or surrogate magic file) */
+ if ((m = file_softmagic(ms, buf, nb)) == 0) {
+ /* try known keywords, check whether it is ASCII */
+ if ((m = file_ascmagic(ms, buf, nb)) == 0) {
+ /* abandon hope, all ye who remain here */
+ if (file_printf(ms, ms->flags & MAGIC_MIME ?
+ "application/octet-stream" : "data") == -1)
+ return -1;
+ m = 1;
+ }
+ }
+ }
+ }
+ return m;
+}
+#endif
+
+protected int
+file_reset(struct magic_set *ms)
+{
+ if (ms->mlist == NULL) {
+ file_error(ms, 0, "no magic files loaded");
+ return -1;
+ }
+ ms->o.ptr = ms->o.buf;
+ ms->haderr = 0;
+ ms->error = -1;
+ return 0;
+}
+
+protected const char *
+file_getbuffer(struct magic_set *ms)
+{
+ char *nbuf, *op, *np;
+ size_t nsize;
+
+ if (ms->haderr)
+ return NULL;
+
+ if (ms->flags & MAGIC_RAW)
+ return ms->o.buf;
+
+ nsize = ms->o.len * 4 + 1;
+ if (ms->o.psize < nsize) {
+ if ((nbuf = realloc(ms->o.pbuf, nsize)) == NULL) {
+ file_oomem(ms);
+ return NULL;
+ }
+ ms->o.psize = nsize;
+ ms->o.pbuf = nbuf;
+ }
+
+ for (np = ms->o.pbuf, op = ms->o.buf; *op; op++) {
+ if (isprint((unsigned char)*op)) {
+ *np++ = *op;
+ } else {
+ *np++ = '\\';
+ *np++ = ((*op >> 6) & 3) + '0';
+ *np++ = ((*op >> 3) & 7) + '0';
+ *np++ = ((*op >> 0) & 7) + '0';
+ }
+ }
+ *np = '\0';
+ return ms->o.pbuf;
+}
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