Last change
on this file since 1426 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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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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