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-rw-r--r--src/funcs.c918
1 files changed, 918 insertions, 0 deletions
diff --git a/src/funcs.c b/src/funcs.c
new file mode 100644
index 0000000..d4fefcd
--- /dev/null
+++ b/src/funcs.c
@@ -0,0 +1,918 @@
+/*
+ * 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.
+ *
+ * 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"
+
+#ifndef lint
+FILE_RCSID("@(#)$File: funcs.c,v 1.136 2022/12/26 17:31:14 christos Exp $")
+#endif /* lint */
+
+#include "magic.h"
+#include <assert.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h> /* for pipe2() */
+#endif
+#if defined(HAVE_WCHAR_H)
+#include <wchar.h>
+#endif
+#if defined(HAVE_WCTYPE_H)
+#include <wctype.h>
+#endif
+#include <limits.h>
+
+#ifndef SIZE_MAX
+#define SIZE_MAX ((size_t)~0)
+#endif
+
+file_protected char *
+file_copystr(char *buf, size_t blen, size_t width, const char *str)
+{
+ if (blen == 0)
+ return buf;
+ if (width >= blen)
+ width = blen - 1;
+ memcpy(buf, str, width);
+ buf[width] = '\0';
+ return buf;
+}
+
+file_private void
+file_clearbuf(struct magic_set *ms)
+{
+ free(ms->o.buf);
+ ms->o.buf = NULL;
+ ms->o.blen = 0;
+}
+
+file_private int
+file_checkfield(char *msg, size_t mlen, const char *what, const char **pp)
+{
+ const char *p = *pp;
+ int fw = 0;
+
+ while (*p && isdigit((unsigned char)*p))
+ fw = fw * 10 + (*p++ - '0');
+
+ *pp = p;
+
+ if (fw < 1024)
+ return 1;
+ if (msg)
+ snprintf(msg, mlen, "field %s too large: %d", what, fw);
+
+ return 0;
+}
+
+file_protected int
+file_checkfmt(char *msg, size_t mlen, const char *fmt)
+{
+ const char *p;
+ for (p = fmt; *p; p++) {
+ if (*p != '%')
+ continue;
+ if (*++p == '%')
+ continue;
+ // Skip uninteresting.
+ while (strchr("#0.'+- ", *p) != NULL)
+ p++;
+ if (*p == '*') {
+ if (msg)
+ snprintf(msg, mlen, "* not allowed in format");
+ return -1;
+ }
+
+ if (!file_checkfield(msg, mlen, "width", &p))
+ return -1;
+
+ if (*p == '.') {
+ p++;
+ if (!file_checkfield(msg, mlen, "precision", &p))
+ return -1;
+ }
+
+ if (!isalpha((unsigned char)*p)) {
+ if (msg)
+ snprintf(msg, mlen, "bad format char: %c", *p);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Like printf, only we append to a buffer.
+ */
+file_protected int
+file_vprintf(struct magic_set *ms, const char *fmt, va_list ap)
+{
+ int len;
+ char *buf, *newstr;
+ char tbuf[1024];
+
+ if (ms->event_flags & EVENT_HAD_ERR)
+ return 0;
+
+ if (file_checkfmt(tbuf, sizeof(tbuf), fmt)) {
+ file_clearbuf(ms);
+ file_error(ms, 0, "Bad magic format `%s' (%s)", fmt, tbuf);
+ return -1;
+ }
+
+ len = vasprintf(&buf, fmt, ap);
+ if (len < 0 || (size_t)len > 1024 || len + ms->o.blen > 1024 * 1024) {
+ size_t blen = ms->o.blen;
+ free(buf);
+ file_clearbuf(ms);
+ file_error(ms, 0, "Output buffer space exceeded %d+%"
+ SIZE_T_FORMAT "u", len, blen);
+ return -1;
+ }
+
+ if (ms->o.buf != NULL) {
+ len = asprintf(&newstr, "%s%s", ms->o.buf, buf);
+ free(buf);
+ if (len < 0)
+ goto out;
+ free(ms->o.buf);
+ buf = newstr;
+ }
+ ms->o.buf = buf;
+ ms->o.blen = len;
+ return 0;
+out:
+ file_clearbuf(ms);
+ file_error(ms, errno, "vasprintf failed");
+ return -1;
+}
+
+file_protected int
+file_printf(struct magic_set *ms, const char *fmt, ...)
+{
+ int rv;
+ va_list ap;
+
+ va_start(ap, fmt);
+ rv = file_vprintf(ms, fmt, ap);
+ va_end(ap);
+ return rv;
+}
+
+/*
+ * error - print best error message possible
+ */
+/*VARARGS*/
+__attribute__((__format__(__printf__, 3, 0)))
+file_private void
+file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
+ size_t lineno)
+{
+ /* Only the first error is ok */
+ if (ms->event_flags & EVENT_HAD_ERR)
+ return;
+ if (lineno != 0) {
+ file_clearbuf(ms);
+ (void)file_printf(ms, "line %" SIZE_T_FORMAT "u:", lineno);
+ }
+ if (ms->o.buf && *ms->o.buf)
+ (void)file_printf(ms, " ");
+ (void)file_vprintf(ms, f, va);
+ if (error > 0)
+ (void)file_printf(ms, " (%s)", strerror(error));
+ ms->event_flags |= EVENT_HAD_ERR;
+ ms->error = error;
+}
+
+/*VARARGS*/
+file_protected void
+file_error(struct magic_set *ms, int error, const char *f, ...)
+{
+ va_list va;
+ va_start(va, f);
+ file_error_core(ms, error, f, va, 0);
+ va_end(va);
+}
+
+/*
+ * Print an error with magic line number.
+ */
+/*VARARGS*/
+file_protected void
+file_magerror(struct magic_set *ms, const char *f, ...)
+{
+ va_list va;
+ va_start(va, f);
+ file_error_core(ms, 0, f, va, ms->line);
+ va_end(va);
+}
+
+file_protected void
+file_oomem(struct magic_set *ms, size_t len)
+{
+ file_error(ms, errno, "cannot allocate %" SIZE_T_FORMAT "u bytes",
+ len);
+}
+
+file_protected void
+file_badseek(struct magic_set *ms)
+{
+ file_error(ms, errno, "error seeking");
+}
+
+file_protected void
+file_badread(struct magic_set *ms)
+{
+ file_error(ms, errno, "error reading");
+}
+
+#ifndef COMPILE_ONLY
+#define FILE_SEPARATOR "\n- "
+
+file_protected int
+file_separator(struct magic_set *ms)
+{
+ return file_printf(ms, FILE_SEPARATOR);
+}
+
+static void
+trim_separator(struct magic_set *ms)
+{
+ size_t l;
+
+ if (ms->o.buf == NULL)
+ return;
+
+ l = strlen(ms->o.buf);
+ if (l < sizeof(FILE_SEPARATOR))
+ return;
+
+ l -= sizeof(FILE_SEPARATOR) - 1;
+ if (strcmp(ms->o.buf + l, FILE_SEPARATOR) != 0)
+ return;
+
+ ms->o.buf[l] = '\0';
+}
+
+static int
+checkdone(struct magic_set *ms, int *rv)
+{
+ if ((ms->flags & MAGIC_CONTINUE) == 0)
+ return 1;
+ if (file_separator(ms) == -1)
+ *rv = -1;
+ return 0;
+}
+
+file_protected int
+file_default(struct magic_set *ms, size_t nb)
+{
+ if (ms->flags & MAGIC_MIME) {
+ if ((ms->flags & MAGIC_MIME_TYPE) &&
+ file_printf(ms, "application/%s",
+ nb ? "octet-stream" : "x-empty") == -1)
+ return -1;
+ return 1;
+ }
+ if (ms->flags & MAGIC_APPLE) {
+ if (file_printf(ms, "UNKNUNKN") == -1)
+ return -1;
+ return 1;
+ }
+ if (ms->flags & MAGIC_EXTENSION) {
+ if (file_printf(ms, "???") == -1)
+ return -1;
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * The magic detection functions return:
+ * 1: found
+ * 0: not found
+ * -1: error
+ */
+/*ARGSUSED*/
+file_protected int
+file_buffer(struct magic_set *ms, int fd, struct stat *st,
+ const char *inname __attribute__ ((__unused__)),
+ const void *buf, size_t nb)
+{
+ int m = 0, rv = 0, looks_text = 0;
+ const char *code = NULL;
+ const char *code_mime = "binary";
+ const char *def = "data";
+ const char *ftype = NULL;
+ char *rbuf = NULL;
+ struct buffer b;
+
+ buffer_init(&b, fd, st, buf, nb);
+ ms->mode = b.st.st_mode;
+
+ if (nb == 0) {
+ def = "empty";
+ goto simple;
+ } else if (nb == 1) {
+ def = "very short file (no magic)";
+ goto simple;
+ }
+
+ if ((ms->flags & MAGIC_NO_CHECK_ENCODING) == 0) {
+ looks_text = file_encoding(ms, &b, NULL, 0,
+ &code, &code_mime, &ftype);
+ }
+
+#ifdef __EMX__
+ if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
+ m = file_os2_apptype(ms, inname, &b);
+ if ((ms->flags & MAGIC_DEBUG) != 0)
+ (void)fprintf(stderr, "[try os2_apptype %d]\n", m);
+ switch (m) {
+ case -1:
+ return -1;
+ case 0:
+ break;
+ default:
+ return 1;
+ }
+ }
+#endif
+#if HAVE_FORK
+ /* try compression stuff */
+ if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) == 0) {
+ m = file_zmagic(ms, &b, inname);
+ if ((ms->flags & MAGIC_DEBUG) != 0)
+ (void)fprintf(stderr, "[try zmagic %d]\n", m);
+ if (m) {
+ goto done_encoding;
+ }
+ }
+#endif
+ /* Check if we have a tar file */
+ if ((ms->flags & MAGIC_NO_CHECK_TAR) == 0) {
+ m = file_is_tar(ms, &b);
+ if ((ms->flags & MAGIC_DEBUG) != 0)
+ (void)fprintf(stderr, "[try tar %d]\n", m);
+ if (m) {
+ if (checkdone(ms, &rv))
+ goto done;
+ }
+ }
+
+ /* Check if we have a JSON file */
+ if ((ms->flags & MAGIC_NO_CHECK_JSON) == 0) {
+ m = file_is_json(ms, &b);
+ if ((ms->flags & MAGIC_DEBUG) != 0)
+ (void)fprintf(stderr, "[try json %d]\n", m);
+ if (m) {
+ if (checkdone(ms, &rv))
+ goto done;
+ }
+ }
+
+ /* Check if we have a CSV file */
+ if ((ms->flags & MAGIC_NO_CHECK_CSV) == 0) {
+ m = file_is_csv(ms, &b, looks_text);
+ if ((ms->flags & MAGIC_DEBUG) != 0)
+ (void)fprintf(stderr, "[try csv %d]\n", m);
+ if (m) {
+ if (checkdone(ms, &rv))
+ goto done;
+ }
+ }
+
+ /* Check if we have a CDF file */
+ if ((ms->flags & MAGIC_NO_CHECK_CDF) == 0) {
+ m = file_trycdf(ms, &b);
+ if ((ms->flags & MAGIC_DEBUG) != 0)
+ (void)fprintf(stderr, "[try cdf %d]\n", m);
+ if (m) {
+ if (checkdone(ms, &rv))
+ goto done;
+ }
+ }
+#ifdef BUILTIN_ELF
+ if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && nb > 5 && fd != -1) {
+ file_pushbuf_t *pb;
+ /*
+ * We matched something in the file, so this
+ * *might* be an ELF file, and the file is at
+ * least 5 bytes long, so if it's an ELF file
+ * it has at least one byte past the ELF magic
+ * number - try extracting information from the
+ * ELF headers that cannot easily be extracted
+ * with rules in the magic file. We we don't
+ * print the information yet.
+ */
+ if ((pb = file_push_buffer(ms)) == NULL)
+ return -1;
+
+ rv = file_tryelf(ms, &b);
+ rbuf = file_pop_buffer(ms, pb);
+ if (rv == -1) {
+ free(rbuf);
+ rbuf = NULL;
+ }
+ if ((ms->flags & MAGIC_DEBUG) != 0)
+ (void)fprintf(stderr, "[try elf %d]\n", m);
+ }
+#endif
+
+ /* try soft magic tests */
+ if ((ms->flags & MAGIC_NO_CHECK_SOFT) == 0) {
+ m = file_softmagic(ms, &b, NULL, NULL, BINTEST, looks_text);
+ if ((ms->flags & MAGIC_DEBUG) != 0)
+ (void)fprintf(stderr, "[try softmagic %d]\n", m);
+ if (m == 1 && rbuf) {
+ if (file_printf(ms, "%s", rbuf) == -1)
+ goto done;
+ }
+ if (m) {
+ if (checkdone(ms, &rv))
+ goto done;
+ }
+ }
+
+ /* try text properties */
+ if ((ms->flags & MAGIC_NO_CHECK_TEXT) == 0) {
+
+ m = file_ascmagic(ms, &b, looks_text);
+ if ((ms->flags & MAGIC_DEBUG) != 0)
+ (void)fprintf(stderr, "[try ascmagic %d]\n", m);
+ if (m) {
+ goto done;
+ }
+ }
+
+simple:
+ /* give up */
+ if (m == 0) {
+ m = 1;
+ rv = file_default(ms, nb);
+ if (rv == 0)
+ if (file_printf(ms, "%s", def) == -1)
+ rv = -1;
+ }
+ done:
+ trim_separator(ms);
+ if ((ms->flags & MAGIC_MIME_ENCODING) != 0) {
+ if (ms->flags & MAGIC_MIME_TYPE)
+ if (file_printf(ms, "; charset=") == -1)
+ rv = -1;
+ if (file_printf(ms, "%s", code_mime) == -1)
+ rv = -1;
+ }
+#if HAVE_FORK
+ done_encoding:
+#endif
+ free(rbuf);
+ buffer_fini(&b);
+ if (rv)
+ return rv;
+
+ return m;
+}
+#endif
+
+file_protected int
+file_reset(struct magic_set *ms, int checkloaded)
+{
+ if (checkloaded && ms->mlist[0] == NULL) {
+ file_error(ms, 0, "no magic files loaded");
+ return -1;
+ }
+ file_clearbuf(ms);
+ if (ms->o.pbuf) {
+ free(ms->o.pbuf);
+ ms->o.pbuf = NULL;
+ }
+ ms->event_flags &= ~EVENT_HAD_ERR;
+ ms->error = -1;
+ return 0;
+}
+
+#define OCTALIFY(n, o) \
+ /*LINTED*/ \
+ (void)(*(n)++ = '\\', \
+ *(n)++ = ((CAST(uint32_t, *(o)) >> 6) & 3) + '0', \
+ *(n)++ = ((CAST(uint32_t, *(o)) >> 3) & 7) + '0', \
+ *(n)++ = ((CAST(uint32_t, *(o)) >> 0) & 7) + '0', \
+ (o)++)
+
+file_protected const char *
+file_getbuffer(struct magic_set *ms)
+{
+ char *pbuf, *op, *np;
+ size_t psize, len;
+
+ if (ms->event_flags & EVENT_HAD_ERR)
+ return NULL;
+
+ if (ms->flags & MAGIC_RAW)
+ return ms->o.buf;
+
+ if (ms->o.buf == NULL)
+ return NULL;
+
+ /* * 4 is for octal representation, + 1 is for NUL */
+ len = strlen(ms->o.buf);
+ if (len > (SIZE_MAX - 1) / 4) {
+ file_oomem(ms, len);
+ return NULL;
+ }
+ psize = len * 4 + 1;
+ if ((pbuf = CAST(char *, realloc(ms->o.pbuf, psize))) == NULL) {
+ file_oomem(ms, psize);
+ return NULL;
+ }
+ ms->o.pbuf = pbuf;
+
+#if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
+ {
+ mbstate_t state;
+ wchar_t nextchar;
+ int mb_conv = 1;
+ size_t bytesconsumed;
+ char *eop;
+ (void)memset(&state, 0, sizeof(mbstate_t));
+
+ np = ms->o.pbuf;
+ op = ms->o.buf;
+ eop = op + len;
+
+ while (op < eop) {
+ bytesconsumed = mbrtowc(&nextchar, op,
+ CAST(size_t, eop - op), &state);
+ if (bytesconsumed == CAST(size_t, -1) ||
+ bytesconsumed == CAST(size_t, -2)) {
+ mb_conv = 0;
+ break;
+ }
+
+ if (iswprint(nextchar)) {
+ (void)memcpy(np, op, bytesconsumed);
+ op += bytesconsumed;
+ np += bytesconsumed;
+ } else {
+ while (bytesconsumed-- > 0)
+ OCTALIFY(np, op);
+ }
+ }
+ *np = '\0';
+
+ /* Parsing succeeded as a multi-byte sequence */
+ if (mb_conv != 0)
+ return ms->o.pbuf;
+ }
+#endif
+
+ for (np = ms->o.pbuf, op = ms->o.buf; *op;) {
+ if (isprint(CAST(unsigned char, *op))) {
+ *np++ = *op++;
+ } else {
+ OCTALIFY(np, op);
+ }
+ }
+ *np = '\0';
+ return ms->o.pbuf;
+}
+
+file_protected int
+file_check_mem(struct magic_set *ms, unsigned int level)
+{
+ size_t len;
+
+ if (level >= ms->c.len) {
+ len = (ms->c.len = 20 + level) * sizeof(*ms->c.li);
+ ms->c.li = CAST(struct level_info *, (ms->c.li == NULL) ?
+ malloc(len) :
+ realloc(ms->c.li, len));
+ if (ms->c.li == NULL) {
+ file_oomem(ms, len);
+ return -1;
+ }
+ }
+ ms->c.li[level].got_match = 0;
+#ifdef ENABLE_CONDITIONALS
+ ms->c.li[level].last_match = 0;
+ ms->c.li[level].last_cond = COND_NONE;
+#endif /* ENABLE_CONDITIONALS */
+ return 0;
+}
+
+file_protected size_t
+file_printedlen(const struct magic_set *ms)
+{
+ return ms->o.blen;
+}
+
+file_protected int
+file_replace(struct magic_set *ms, const char *pat, const char *rep)
+{
+ file_regex_t rx;
+ int rc, rv = -1;
+
+ rc = file_regcomp(ms, &rx, pat, REG_EXTENDED);
+ if (rc == 0) {
+ regmatch_t rm;
+ int nm = 0;
+ while (file_regexec(ms, &rx, ms->o.buf, 1, &rm, 0) == 0) {
+ ms->o.buf[rm.rm_so] = '\0';
+ if (file_printf(ms, "%s%s", rep,
+ rm.rm_eo != 0 ? ms->o.buf + rm.rm_eo : "") == -1)
+ goto out;
+ nm++;
+ }
+ rv = nm;
+ }
+out:
+ file_regfree(&rx);
+ return rv;
+}
+
+file_private int
+check_regex(struct magic_set *ms, const char *pat)
+{
+ char sbuf[512];
+ unsigned char oc = '\0';
+
+ for (const char *p = pat; *p; p++) {
+ unsigned char c = *p;
+ // Avoid repetition
+ if (c == oc && strchr("?*+{", c) != NULL) {
+ size_t len = strlen(pat);
+ file_magwarn(ms,
+ "repetition-operator operand `%c' "
+ "invalid in regex `%s'", c,
+ file_printable(ms, sbuf, sizeof(sbuf), pat, len));
+ return -1;
+ }
+ oc = c;
+ if (isprint(c) || isspace(c) || c == '\b'
+ || c == 0x8a) // XXX: apple magic fixme
+ continue;
+ size_t len = strlen(pat);
+ file_magwarn(ms,
+ "non-ascii characters in regex \\%#o `%s'",
+ c, file_printable(ms, sbuf, sizeof(sbuf), pat, len));
+ return -1;
+ }
+ return 0;
+}
+
+file_protected int
+file_regcomp(struct magic_set *ms file_locale_used, file_regex_t *rx,
+ const char *pat, int flags)
+{
+ if (check_regex(ms, pat) == -1)
+ return -1;
+
+#ifdef USE_C_LOCALE
+ locale_t old = uselocale(ms->c_lc_ctype);
+ assert(old != NULL);
+#else
+ char old[1024];
+ strlcpy(old, setlocale(LC_CTYPE, NULL), sizeof(old));
+ (void)setlocale(LC_CTYPE, "C");
+#endif
+ int rc;
+ rc = regcomp(rx, pat, flags);
+
+#ifdef USE_C_LOCALE
+ uselocale(old);
+#else
+ (void)setlocale(LC_CTYPE, old);
+#endif
+ if (rc > 0 && (ms->flags & MAGIC_CHECK)) {
+ char errmsg[512], buf[512];
+
+ (void)regerror(rc, rx, errmsg, sizeof(errmsg));
+ file_magerror(ms, "regex error %d for `%s', (%s)", rc,
+ file_printable(ms, buf, sizeof(buf), pat, strlen(pat)),
+ errmsg);
+ }
+ return rc;
+}
+
+/*ARGSUSED*/
+file_protected int
+file_regexec(struct magic_set *ms file_locale_used, file_regex_t *rx,
+ const char *str, size_t nmatch, regmatch_t* pmatch, int eflags)
+{
+#ifdef USE_C_LOCALE
+ locale_t old = uselocale(ms->c_lc_ctype);
+ assert(old != NULL);
+#else
+ char old[1024];
+ strlcpy(old, setlocale(LC_CTYPE, NULL), sizeof(old));
+ (void)setlocale(LC_CTYPE, "C");
+#endif
+ int rc;
+ /* XXX: force initialization because glibc does not always do this */
+ if (nmatch != 0)
+ memset(pmatch, 0, nmatch * sizeof(*pmatch));
+ rc = regexec(rx, str, nmatch, pmatch, eflags);
+#ifdef USE_C_LOCALE
+ uselocale(old);
+#else
+ (void)setlocale(LC_CTYPE, old);
+#endif
+ return rc;
+}
+
+file_protected void
+file_regfree(file_regex_t *rx)
+{
+ regfree(rx);
+}
+
+file_protected file_pushbuf_t *
+file_push_buffer(struct magic_set *ms)
+{
+ file_pushbuf_t *pb;
+
+ if (ms->event_flags & EVENT_HAD_ERR)
+ return NULL;
+
+ if ((pb = (CAST(file_pushbuf_t *, malloc(sizeof(*pb))))) == NULL)
+ return NULL;
+
+ pb->buf = ms->o.buf;
+ pb->blen = ms->o.blen;
+ pb->offset = ms->offset;
+
+ ms->o.buf = NULL;
+ ms->o.blen = 0;
+ ms->offset = 0;
+
+ return pb;
+}
+
+file_protected char *
+file_pop_buffer(struct magic_set *ms, file_pushbuf_t *pb)
+{
+ char *rbuf;
+
+ if (ms->event_flags & EVENT_HAD_ERR) {
+ free(pb->buf);
+ free(pb);
+ return NULL;
+ }
+
+ rbuf = ms->o.buf;
+
+ ms->o.buf = pb->buf;
+ ms->o.blen = pb->blen;
+ ms->offset = pb->offset;
+
+ free(pb);
+ return rbuf;
+}
+
+/*
+ * convert string to ascii printable format.
+ */
+file_protected char *
+file_printable(struct magic_set *ms, char *buf, size_t bufsiz,
+ const char *str, size_t slen)
+{
+ char *ptr, *eptr = buf + bufsiz - 1;
+ const unsigned char *s = RCAST(const unsigned char *, str);
+ const unsigned char *es = s + slen;
+
+ for (ptr = buf; ptr < eptr && s < es && *s; s++) {
+ if ((ms->flags & MAGIC_RAW) != 0 || isprint(*s)) {
+ *ptr++ = *s;
+ continue;
+ }
+ if (ptr >= eptr - 3)
+ break;
+ *ptr++ = '\\';
+ *ptr++ = ((CAST(unsigned int, *s) >> 6) & 7) + '0';
+ *ptr++ = ((CAST(unsigned int, *s) >> 3) & 7) + '0';
+ *ptr++ = ((CAST(unsigned int, *s) >> 0) & 7) + '0';
+ }
+ *ptr = '\0';
+ return buf;
+}
+
+struct guid {
+ uint32_t data1;
+ uint16_t data2;
+ uint16_t data3;
+ uint8_t data4[8];
+};
+
+file_protected int
+file_parse_guid(const char *s, uint64_t *guid)
+{
+ struct guid *g = CAST(struct guid *, CAST(void *, guid));
+#ifndef WIN32
+ return sscanf(s,
+ "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
+ &g->data1, &g->data2, &g->data3, &g->data4[0], &g->data4[1],
+ &g->data4[2], &g->data4[3], &g->data4[4], &g->data4[5],
+ &g->data4[6], &g->data4[7]) == 11 ? 0 : -1;
+#else
+ /* MS-Windows runtime doesn't support %hhx, except under
+ non-default __USE_MINGW_ANSI_STDIO. */
+ uint16_t data16[8];
+ int rv = sscanf(s, "%8x-%4hx-%4hx-%2hx%2hx-%2hx%2hx%2hx%2hx%2hx%2hx",
+ &g->data1, &g->data2, &g->data3, &data16[0], &data16[1],
+ &data16[2], &data16[3], &data16[4], &data16[5],
+ &data16[6], &data16[7]) == 11 ? 0 : -1;
+ int i;
+ for (i = 0; i < 8; i++)
+ g->data4[i] = data16[i];
+ return rv;
+#endif
+}
+
+file_protected int
+file_print_guid(char *str, size_t len, const uint64_t *guid)
+{
+ const struct guid *g = CAST(const struct guid *,
+ CAST(const void *, guid));
+
+#ifndef WIN32
+ return snprintf(str, len, "%.8X-%.4hX-%.4hX-%.2hhX%.2hhX-"
+ "%.2hhX%.2hhX%.2hhX%.2hhX%.2hhX%.2hhX",
+ g->data1, g->data2, g->data3, g->data4[0], g->data4[1],
+ g->data4[2], g->data4[3], g->data4[4], g->data4[5],
+ g->data4[6], g->data4[7]);
+#else
+ return snprintf(str, len, "%.8X-%.4hX-%.4hX-%.2hX%.2hX-"
+ "%.2hX%.2hX%.2hX%.2hX%.2hX%.2hX",
+ g->data1, g->data2, g->data3, g->data4[0], g->data4[1],
+ g->data4[2], g->data4[3], g->data4[4], g->data4[5],
+ g->data4[6], g->data4[7]);
+#endif
+}
+
+file_protected int
+file_pipe_closexec(int *fds)
+{
+#ifdef HAVE_PIPE2
+ return pipe2(fds, O_CLOEXEC);
+#else
+ if (pipe(fds) == -1)
+ return -1;
+# ifdef F_SETFD
+ (void)fcntl(fds[0], F_SETFD, FD_CLOEXEC);
+ (void)fcntl(fds[1], F_SETFD, FD_CLOEXEC);
+# endif
+ return 0;
+#endif
+}
+
+file_protected int
+file_clear_closexec(int fd) {
+#ifdef F_SETFD
+ return fcntl(fd, F_SETFD, 0);
+#else
+ return 0;
+#endif
+}
+
+file_protected char *
+file_strtrim(char *str)
+{
+ char *last;
+
+ while (isspace(CAST(unsigned char, *str)))
+ str++;
+ last = str;
+ while (*last)
+ last++;
+ --last;
+ while (isspace(CAST(unsigned char, *last)))
+ last--;
+ *++last = '\0';
+ return str;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 09:21:50 +0000