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1 /* path-elt.c: Return the stuff between colons. |
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2 |
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3 Copyright (C) 1993 Karl Berry. |
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4 |
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5 This program is free software; you can redistribute it and/or modify |
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6 it under the terms of the GNU General Public License as published by |
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7 the Free Software Foundation; either version 2, or (at your option) |
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8 any later version. |
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9 |
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10 This program is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 GNU General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU General Public License |
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16 along with this program; if not, write to the Free Software |
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17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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18 |
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19 #include <kpathsea/config.h> |
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20 |
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21 #include <kpathsea/c-pathch.h> |
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22 #include <kpathsea/pathsearch.h> |
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23 |
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24 |
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25 /* The static (but dynamically allocated) area we return the answer in, |
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26 and how much we've currently allocated for it. */ |
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27 static string elt = NULL; |
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28 static unsigned elt_alloc = 0; |
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29 |
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30 /* The path we're currently working on. */ |
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31 static const_string path = NULL; |
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32 |
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33 |
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34 /* Upon entry, the static `path' is at the first (and perhaps last) |
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35 character of the return value, or else NULL if we're at the end (or |
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36 haven't been called). I make no provision for caching the results; |
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37 thus, we parse the same path over and over, on every lookup. If that |
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38 turns out to be a significant lose, it can be fixed, but I'm guessing |
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39 disk accesses overwhelm everything else. */ |
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40 |
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41 string |
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42 kpse_path_element P1C(const_string, passed_path) |
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43 { |
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44 const_string p; |
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45 string ret; |
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46 |
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47 if (passed_path) |
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48 path = passed_path; |
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49 |
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50 /* Check if called with NULL, and no previous path (perhaps we reached |
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51 the end). */ |
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52 else if (!path) |
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53 return NULL; |
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54 |
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55 /* OK, we have a non-null `path' if we get here. */ |
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56 assert (path); |
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57 p = path; |
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58 |
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59 /* Find the next colon (or the end of the path). */ |
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60 while (*p != 0 && !IS_ENV_SEP (*p)) |
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61 p++; |
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62 |
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63 /* If there were no separators, return the whole thing this time, and |
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64 return NULL next time. */ |
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65 if (*p == 0) |
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66 { |
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67 ret = (string) path; |
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68 path = NULL; |
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69 } |
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70 |
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71 /* Otherwise, return the substring starting at `path'. */ |
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72 else |
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73 { |
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74 unsigned len = p - path; |
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75 |
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76 /* Make sure we have enough space (including the null byte). */ |
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77 if (len + 1 > elt_alloc) |
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78 { |
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79 elt_alloc = len + 1; |
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80 elt = xrealloc (elt, elt_alloc); |
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81 } |
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82 |
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83 strncpy (elt, path, len); |
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84 elt[len] = 0; |
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85 ret = elt; |
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86 |
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87 path += len + 1; |
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88 } |
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89 |
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90 return ret; |
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91 } |
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92 |
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93 #ifdef TEST |
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94 |
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95 void |
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96 print_path_elements (const_string path) |
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97 { |
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98 string elt; |
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99 printf ("Elements of `%s':", path ? path : "(null)"); |
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100 |
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101 for (elt = kpse_path_element (path); elt != NULL; |
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102 elt = kpse_path_element (NULL)) |
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103 { |
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104 printf (" %s", *elt ? elt : "`'"); |
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105 } |
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106 |
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107 puts ("."); |
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108 } |
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109 |
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110 int |
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111 main () |
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112 { |
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113 /* All lists end with NULL. */ |
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114 print_path_elements (NULL); /* */ |
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115 print_path_elements (""); /* "" */ |
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116 print_path_elements ("a"); /* a */ |
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117 print_path_elements (":"); /* "", "" */ |
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118 print_path_elements ("::"); /* "", "", "" */ |
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119 print_path_elements ("a:"); /* a, "" */ |
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120 print_path_elements (":b"); /* "", b */ |
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121 print_path_elements ("a:b"); /* a, b */ |
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122 |
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123 return 0; |
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124 } |
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125 |
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126 #endif /* TEST */ |
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127 |
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128 |
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129 /* |
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130 Local variables: |
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131 standalone-compile-command: "gcc -g -I. -I.. -DTEST path-elt.c kpathsea.a" |
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132 End: |
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133 */ |
