[2172] | 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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[4505] | 10 | * For copying and distribution information, see the file "mit-copying.h." |
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[2172] | 11 | */ |
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| 12 | |
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| 13 | #if (!defined(lint) && !defined(SABER)) |
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[4505] | 14 | static char rcsid_shell_regexp_c[] = "$Header: /afs/dev.mit.edu/source/repository/athena/bin/delete/shell_regexp.c,v 1.3 1991-02-28 18:43:43 jik Exp $"; |
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[2172] | 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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[4505] | 21 | #include "mit-copying.h" |
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[2172] | 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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