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authorEric Andersen2001-03-16 22:47:14 +0000
committerEric Andersen2001-03-16 22:47:14 +0000
commitaad1a88c76f208d188fd061e3723bd637437e8d5 (patch)
tree75ac2b994f7f04af776e93eeedba82b873ff557e /libbb/process_escape_sequence.c
parentdfba13d199bb58d802df99c1ef20fdc0d628e86d (diff)
downloadbusybox-aad1a88c76f208d188fd061e3723bd637437e8d5.zip
busybox-aad1a88c76f208d188fd061e3723bd637437e8d5.tar.gz
Convert utility.c into libbb.a. It is now a whole pile of .c
files. Clean up the resulting damage and fix up the makefile. -Erik
Diffstat (limited to 'libbb/process_escape_sequence.c')
-rw-r--r--libbb/process_escape_sequence.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/libbb/process_escape_sequence.c b/libbb/process_escape_sequence.c
new file mode 100644
index 0000000..ad2be94
--- /dev/null
+++ b/libbb/process_escape_sequence.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) tons of folks. Tracking down who wrote what
+ * isn't something I'm going to worry about... If you wrote something
+ * here, please feel free to acknowledge your work.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
+ * Permission has been granted to redistribute this code under the GPL.
+ *
+ */
+
+#include <stdio.h>
+#include <limits.h>
+#include "libbb.h"
+
+
+
+char process_escape_sequence(char **ptr)
+{
+ static const char charmap[] = {
+ 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', 0,
+ '\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' };
+
+ const char *p;
+ char *q;
+ int num_digits;
+ unsigned int n;
+
+ n = 0;
+ q = *ptr;
+
+ for ( num_digits = 0 ; num_digits < 3 ; ++num_digits) {
+ if ((*q < '0') || (*q > '7')) { /* not a digit? */
+ break;
+ }
+ n = n * 8 + (*q++ - '0');
+ }
+
+ if (num_digits == 0) { /* mnemonic escape sequence? */
+ for (p=charmap ; *p ; p++) {
+ if (*p == *q) {
+ q++;
+ break;
+ }
+ }
+ n = *(p+(sizeof(charmap)/2));
+ }
+
+ /* doesn't hurt to fall through to here from mnemonic case */
+ if (n > UCHAR_MAX) { /* is octal code too big for a char? */
+ n /= 8; /* adjust value and */
+ --q; /* back up one char */
+ }
+
+ *ptr = q;
+ return (char) n;
+}
+
+
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/