Last change
on this file since 1527 was 821, checked in by Bruno Cornec, 18 years ago |
Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
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File size:
1.5 KB
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Rev | Line | |
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[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) Manuel Novoa III <mjn3@codepoet.org>
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| 6 | * and Vladimir Oleynik <dzo@simtreas.ru>
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| 7 | *
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| 8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 9 | */
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| 10 |
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| 11 | #include <stdio.h>
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| 12 | #include <limits.h>
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| 13 | #include <ctype.h>
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| 14 | #include "libbb.h"
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| 15 |
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| 16 | #define WANT_HEX_ESCAPES 1
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| 17 |
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| 18 | /* Usual "this only works for ascii compatible encodings" disclaimer. */
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| 19 | #undef _tolower
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| 20 | #define _tolower(X) ((X)|((char) 0x20))
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| 21 |
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| 22 | char bb_process_escape_sequence(const char **ptr)
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| 23 | {
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| 24 | static const char charmap[] = {
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| 25 | 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', 0,
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| 26 | '\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' };
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| 27 |
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| 28 | const char *p;
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| 29 | const char *q;
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| 30 | unsigned int num_digits;
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| 31 | unsigned int r;
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| 32 | unsigned int n;
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| 33 | unsigned int d;
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| 34 | unsigned int base;
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| 35 |
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| 36 | num_digits = n = 0;
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| 37 | base = 8;
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| 38 | q = *ptr;
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| 39 |
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| 40 | #ifdef WANT_HEX_ESCAPES
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| 41 | if (*q == 'x') {
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| 42 | ++q;
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| 43 | base = 16;
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| 44 | ++num_digits;
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| 45 | }
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| 46 | #endif
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| 47 |
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| 48 | do {
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| 49 | d = (unsigned int)(*q - '0');
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| 50 | #ifdef WANT_HEX_ESCAPES
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| 51 | if (d >= 10) {
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| 52 | d = ((unsigned int)(_tolower(*q) - 'a')) + 10;
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| 53 | }
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| 54 | #endif
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| 55 |
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| 56 | if (d >= base) {
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| 57 | #ifdef WANT_HEX_ESCAPES
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| 58 | if ((base == 16) && (!--num_digits)) {
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| 59 | /* return '\\'; */
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| 60 | --q;
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| 61 | }
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| 62 | #endif
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| 63 | break;
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| 64 | }
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| 65 |
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| 66 | r = n * base + d;
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| 67 | if (r > UCHAR_MAX) {
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| 68 | break;
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| 69 | }
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| 70 |
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| 71 | n = r;
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| 72 | ++q;
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| 73 | } while (++num_digits < 3);
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| 74 |
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| 75 | if (num_digits == 0) { /* mnemonic escape sequence? */
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| 76 | p = charmap;
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| 77 | do {
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| 78 | if (*p == *q) {
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| 79 | q++;
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| 80 | break;
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| 81 | }
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| 82 | } while (*++p);
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| 83 | n = *(p+(sizeof(charmap)/2));
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| 84 | }
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| 85 |
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| 86 | *ptr = q;
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| 87 |
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| 88 | return (char) n;
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| 89 | }
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