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84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) tons of folks. Tracking down who wrote what
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* isn't something I'm going to worry about... If you wrote something
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* here, please feel free to acknowledge your work.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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* Permission has been granted to redistribute this code under the GPL.
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*
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*/
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#include <stdio.h>
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#include <limits.h>
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#include "libbb.h"
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char process_escape_sequence(char **ptr)
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{
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static const char charmap[] = {
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'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', 0,
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'\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' };
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const char *p;
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char *q;
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int num_digits;
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unsigned int n;
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n = 0;
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q = *ptr;
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for ( num_digits = 0 ; num_digits < 3 ; ++num_digits) {
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if ((*q < '0') || (*q > '7')) { /* not a digit? */
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break;
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}
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n = n * 8 + (*q++ - '0');
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}
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if (num_digits == 0) { /* mnemonic escape sequence? */
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for (p=charmap ; *p ; p++) {
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if (*p == *q) {
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q++;
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break;
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}
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}
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n = *(p+(sizeof(charmap)/2));
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}
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/* doesn't hurt to fall through to here from mnemonic case */
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if (n > UCHAR_MAX) { /* is octal code too big for a char? */
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n /= 8; /* adjust value and */
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--q; /* back up one char */
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}
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*ptr = q;
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return (char) n;
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}
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/* END CODE */
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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