1 | /* |
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2 | * $Source: /afs/dev.mit.edu/source/repository/athena/bin/delete/shell_regexp.c,v $ |
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3 | * $Author: jik $ |
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4 | * |
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5 | * This program is part of a package including delete, undelete, |
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6 | * lsdel, expunge and purge. The software suite is meant as a |
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7 | * replacement for rm which allows for file recovery. |
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8 | * |
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9 | * Copyright (c) 1989 by the Massachusetts Institute of Technology. |
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10 | * For copying and distribution information, see the file "mit-copyright.h." |
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11 | */ |
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12 | |
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13 | #if (!defined(lint) && !defined(SABER)) |
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14 | static char rcsid_shell_regexp_c[] = "$Header: /afs/dev.mit.edu/source/repository/athena/bin/delete/shell_regexp.c,v 1.2 1989-11-06 21:27:16 jik Exp $"; |
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15 | #endif |
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16 | |
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17 | #include <com_err.h> |
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18 | #include "shell_regexp.h" |
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19 | #include "delete_errs.h" |
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20 | #include "errors.h" |
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21 | #include "mit-copyright.h" |
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22 | |
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23 | static int real_cmp(); |
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24 | |
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25 | /* |
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26 | * This is a simple pattern matcher that takes a pattern string and |
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27 | * another string (theoretically a filename) and checks if the second |
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28 | * string matches the pattern string using shell special characters |
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29 | * (i.e. it recognizes \, ?, *, [, ]). It also special cases dot |
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30 | * files (i.e. * doesn't match files that start with periods, and |
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31 | * neither will ?*, and neither will [.]*). |
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32 | */ |
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33 | |
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34 | int reg_cmp(pattern, filename) |
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35 | char *pattern, *filename; |
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36 | { |
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37 | /* First, dot file special cases */ |
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38 | if ((*filename == '.') && (*pattern != '.')) |
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39 | return REGEXP_NO_MATCH; |
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40 | |
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41 | return real_cmp(pattern, filename); |
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42 | } |
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43 | |
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44 | static int real_cmp(pattern, filename) |
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45 | char *pattern, *filename; |
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46 | { |
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47 | if (*pattern == '\0') { |
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48 | if (*filename == '\0') |
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49 | return REGEXP_MATCH; |
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50 | else |
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51 | return REGEXP_NO_MATCH; |
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52 | } |
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53 | |
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54 | if (*pattern == '*') { |
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55 | int retval; |
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56 | char *ptr; |
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57 | |
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58 | if (*(pattern + 1) == '\0') |
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59 | /* asterisk by itself matches anything */ |
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60 | return REGEXP_MATCH; |
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61 | for (ptr = filename; *ptr; ptr++) |
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62 | if ((retval = real_cmp(pattern + 1, ptr)) != REGEXP_NO_MATCH) |
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63 | return retval; |
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64 | return REGEXP_NO_MATCH; |
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65 | } |
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66 | |
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67 | if (*filename == '\0') |
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68 | return REGEXP_NO_MATCH; |
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69 | |
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70 | if (*pattern == '?') |
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71 | return real_cmp(pattern + 1, filename + 1); |
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72 | |
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73 | if (*pattern == '\\') { |
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74 | if (*(pattern + 1) == '\0') { |
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75 | set_error(REGEXP_MISSING_QUOTED_CHAR); |
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76 | return -1; |
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77 | } |
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78 | if (*(pattern + 1) == *filename) |
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79 | return real_cmp(pattern + 2, filename + 1); |
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80 | else |
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81 | return REGEXP_NO_MATCH; |
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82 | } |
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83 | |
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84 | if (*pattern == '[') { |
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85 | char *ptr, *end_ptr; |
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86 | |
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87 | for (end_ptr = pattern + 1; (*end_ptr != '\0') && (*end_ptr != ']'); |
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88 | end_ptr++) ; |
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89 | if (*end_ptr == '\0') { |
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90 | set_error(REGEXP_MISSING_BRACE); |
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91 | return -1; |
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92 | } |
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93 | if (end_ptr == pattern + 1) { |
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94 | set_error(REGEXP_EMPTY_BRACES); |
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95 | return -1; |
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96 | } |
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97 | for (ptr = pattern + 1; ptr < end_ptr; ptr++) { |
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98 | if ((*(ptr + 1) == '-') && (*(ptr + 2) != ']')) { |
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99 | if ((*ptr <= *filename) && (*(ptr + 2) >= *filename)) |
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100 | return real_cmp(end_ptr + 1, filename + 1); |
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101 | else { |
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102 | ptr += 2; |
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103 | continue; |
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104 | } |
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105 | } |
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106 | if (*ptr == *filename) |
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107 | return real_cmp(end_ptr + 1, filename + 1); |
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108 | } |
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109 | |
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110 | return REGEXP_NO_MATCH; |
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111 | } |
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112 | |
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113 | if (*pattern == *filename) |
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114 | return real_cmp(pattern + 1, filename + 1); |
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115 | else |
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116 | return REGEXP_NO_MATCH; |
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117 | } |
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