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1 /* ========================================================================
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2 * Copyright 1988-2006 University of Washington
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 *
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11 * ========================================================================
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12 */
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13
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14 /*
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15 * Program: IMAP Wildcard Matching Routines (case-independent)
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16 *
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17 * Author: Mark Crispin
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18 * Networks and Distributed Computing
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19 * Computing & Communications
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20 * University of Washington
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21 * Administration Building, AG-44
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22 * Seattle, WA 98195
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23 * Internet: MRC@CAC.Washington.EDU
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24 *
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25 * Date: 15 June 2000
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26 * Last Edited: 30 August 2006
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27 */
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28
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29 /* Wildcard pattern match
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30 * Accepts: base string
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31 * pattern string
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32 * delimiter character
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33 * Returns: T if pattern matches base, else NIL
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34 */
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35
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36 long pmatch_full (unsigned char *s,unsigned char *pat,unsigned char delim)
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37 {
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38 switch (*pat) {
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39 case '%': /* non-recursive */
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40 /* % at end, OK if no inferiors */
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41 if (!pat[1]) return (delim && strchr (s,delim)) ? NIL : T;
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42 /* scan remainder of string until delimiter */
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43 do if (pmatch_full (s,pat+1,delim)) return T;
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44 while ((*s != delim) && *s++);
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45 break;
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46 case '*': /* match 0 or more characters */
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47 if (!pat[1]) return T; /* * at end, unconditional match */
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48 /* scan remainder of string */
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49 do if (pmatch_full (s,pat+1,delim)) return T;
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50 while (*s++);
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51 break;
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52 case '\0': /* end of pattern */
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53 return *s ? NIL : T; /* success if also end of base */
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54 default: /* match this character */
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55 return compare_uchar (*pat,*s) ? NIL : pmatch_full (s+1,pat+1,delim);
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56 }
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57 return NIL;
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58 }
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59
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60 /* Directory pattern match
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61 * Accepts: base string
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62 * pattern string
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63 * delimiter character
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64 * Returns: T if base is a matching directory of pattern, else NIL
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65 */
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66
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67 long dmatch (unsigned char *s,unsigned char *pat,unsigned char delim)
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68 {
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69 switch (*pat) {
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70 case '%': /* non-recursive */
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71 if (!*s) return T; /* end of base means have a subset match */
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72 if (!*++pat) return NIL; /* % at end, no inferiors permitted */
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73 /* scan remainder of string until delimiter */
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74 do if (dmatch (s,pat,delim)) return T;
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75 while ((*s != delim) && *s++);
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76 if (*s && !s[1]) return T; /* ends with delimiter, must be subset */
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77 return dmatch (s,pat,delim);/* do new scan */
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78 case '*': /* match 0 or more characters */
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79 return T; /* unconditional match */
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80 case '\0': /* end of pattern */
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81 break;
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82 default: /* match this character */
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83 if (*s) return compare_uchar (*pat,*s) ? NIL : dmatch (s+1,pat+1,delim);
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84 /* end of base, return if at delimiter */
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85 else if (*pat == delim) return T;
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86 break;
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87 }
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88 return NIL;
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89 }
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