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relpath.c

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1/* relpath - print the relative path-
2 Copyright (C) 2012-2018 Free Software Foundation, Inc.-
3-
4 This program is free software: you can redistribute it and/or modify-
5 it under the terms of the GNU General Public License as published by-
6 the Free Software Foundation, either version 3 of the License, or-
7 (at your option) any later version.-
8-
9 This program is distributed in the hope that it will be useful,-
10 but WITHOUT ANY WARRANTY; without even the implied warranty of-
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
12 GNU General Public License for more details.-
13-
14 You should have received a copy of the GNU General Public License-
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */-
16-
17/* Written by Pádraig Brady. */-
18-
19#include <config.h>-
20-
21#include "error.h"-
22#include "system.h"-
23#include "relpath.h"-
24-
25-
26/* Return the length of the longest common prefix-
27 of canonical PATH1 and PATH2, ensuring only full path components-
28 are matched. Return 0 on no match. */-
29static int _GL_ATTRIBUTE_PURE-
30path_common_prefix (const char *path1, const char *path2)-
31{-
32 int i = 0;-
33 int ret = 0;-
34-
35 /* We already know path1[0] and path2[0] are '/'. Special case-
36 '//', which is only present in a canonical name on platforms-
37 where it is distinct. */-
38 if ((path1[1] == '/') != (path2[1] == '/'))
(path1[1] == '...th2[1] == '/')Description
TRUEnever evaluated
FALSEevaluated 26 times by 2 tests
Evaluated by:
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0-26
39 return 0;
never executed: return 0;
0
40-
41 while (*path1 && *path2)
*path1Description
TRUEevaluated 702 times by 2 tests
Evaluated by:
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FALSEevaluated 21 times by 2 tests
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*path2Description
TRUEevaluated 700 times by 2 tests
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FALSEevaluated 2 times by 1 test
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2-702
42 {-
43 if (*path1 != *path2)
*path1 != *path2Description
TRUEevaluated 3 times by 2 tests
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FALSEevaluated 697 times by 2 tests
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3-697
44 break;
executed 3 times by 2 tests: break;
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3
45 if (*path1 == '/')
*path1 == '/'Description
TRUEevaluated 83 times by 2 tests
Evaluated by:
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FALSEevaluated 614 times by 2 tests
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83-614
46 ret = i + 1;
executed 83 times by 2 tests: ret = i + 1;
Executed by:
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83
47 path1++;-
48 path2++;-
49 i++;-
50 }
executed 697 times by 2 tests: end of block
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697
51-
52 if ((!*path1 && !*path2)
!*path1Description
TRUEevaluated 21 times by 2 tests
Evaluated by:
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FALSEevaluated 5 times by 2 tests
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!*path2Description
TRUEevaluated 10 times by 1 test
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FALSEevaluated 11 times by 2 tests
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5-21
53 || (!*path1 && *path2 == '/')
!*path1Description
TRUEevaluated 11 times by 2 tests
Evaluated by:
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FALSEevaluated 5 times by 2 tests
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*path2 == '/'Description
TRUEevaluated 3 times by 2 tests
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FALSEevaluated 8 times by 1 test
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3-11
54 || (!*path2 && *path1 == '/'))
!*path2Description
TRUEevaluated 2 times by 1 test
Evaluated by:
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FALSEevaluated 11 times by 2 tests
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*path1 == '/'Description
TRUEevaluated 1 time by 1 test
Evaluated by:
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FALSEevaluated 1 time by 1 test
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1-11
55 ret = i;
executed 14 times by 2 tests: ret = i;
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14
56-
57 return ret;
executed 26 times by 2 tests: return ret;
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26
58}-
59-
60/* Either output STR to stdout or-
61 if *PBUF is not NULL then append STR to *PBUF-
62 and update *PBUF to point to the end of the buffer-
63 and adjust *PLEN to reflect the remaining space.-
64 Return TRUE on failure. */-
65static bool-
66buffer_or_output (const char* str, char **pbuf, size_t *plen)-
67{-
68 if (*pbuf)
*pbufDescription
TRUEevaluated 8 times by 1 test
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FALSEevaluated 26 times by 1 test
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8-26
69 {-
70 size_t slen = strlen (str);-
71 if (slen >= *plen)
slen >= *plenDescription
TRUEnever evaluated
FALSEevaluated 8 times by 1 test
Evaluated by:
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0-8
72 return true;
never executed: return 1 ;
0
73 memcpy (*pbuf, str, slen + 1);-
74 *pbuf += slen;-
75 *plen -= slen;-
76 }
executed 8 times by 1 test: end of block
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8
77 else-
78 {-
79 fputs (str, stdout);-
80 }
executed 26 times by 1 test: end of block
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26
81-
82 return false;
executed 34 times by 2 tests: return 0 ;
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34
83}-
84-
85/* Output the relative representation if possible.-
86 If BUF is non-NULL, write to that buffer rather than to stdout. */-
87bool-
88relpath (const char *can_fname, const char *can_reldir, char *buf, size_t len)-
89{-
90 bool buf_err = false;-
91-
92 /* Skip the prefix common to --relative-to and path. */-
93 int common_index = path_common_prefix (can_reldir, can_fname);-
94 if (!common_index)
!common_indexDescription
TRUEnever evaluated
FALSEevaluated 26 times by 2 tests
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0-26
95 return false;
never executed: return 0 ;
0
96-
97 const char *relto_suffix = can_reldir + common_index;-
98 const char *fname_suffix = can_fname + common_index;-
99-
100 /* Skip over extraneous '/'. */-
101 if (*relto_suffix == '/')
*relto_suffix == '/'Description
TRUEevaluated 1 time by 1 test
Evaluated by:
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FALSEevaluated 25 times by 2 tests
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1-25
102 relto_suffix++;
executed 1 time by 1 test: relto_suffix++;
Executed by:
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1
103 if (*fname_suffix == '/')
*fname_suffix == '/'Description
TRUEevaluated 3 times by 2 tests
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FALSEevaluated 23 times by 2 tests
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3-23
104 fname_suffix++;
executed 3 times by 2 tests: fname_suffix++;
Executed by:
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3
105-
106 /* Replace remaining components of --relative-to with '..', to get-
107 to a common directory. Then output the remainder of fname. */-
108 if (*relto_suffix)
*relto_suffixDescription
TRUEevaluated 6 times by 2 tests
Evaluated by:
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FALSEevaluated 20 times by 2 tests
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6-20
109 {-
110 buf_err |= buffer_or_output ("..", &buf, &len);-
111 for (; *relto_suffix; ++relto_suffix)
*relto_suffixDescription
TRUEevaluated 27 times by 2 tests
Evaluated by:
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FALSEevaluated 6 times by 2 tests
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6-27
112 {-
113 if (*relto_suffix == '/')
*relto_suffix == '/'Description
TRUEnever evaluated
FALSEevaluated 27 times by 2 tests
Evaluated by:
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0-27
114 buf_err |= buffer_or_output ("/..", &buf, &len);
never executed: buf_err |= buffer_or_output ("/..", &buf, &len);
0
115 }
executed 27 times by 2 tests: end of block
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27
116-
117 if (*fname_suffix)
*fname_suffixDescription
TRUEevaluated 4 times by 2 tests
Evaluated by:
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FALSEevaluated 2 times by 1 test
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2-4
118 {-
119 buf_err |= buffer_or_output ("/", &buf, &len);-
120 buf_err |= buffer_or_output (fname_suffix, &buf, &len);-
121 }
executed 4 times by 2 tests: end of block
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4
122 }
executed 6 times by 2 tests: end of block
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6
123 else-
124 {-
125 buf_err |= buffer_or_output (*fname_suffix ? fname_suffix : ".",-
126 &buf, &len);-
127 }
executed 20 times by 2 tests: end of block
Executed by:
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20
128-
129 if (buf_err)
buf_errDescription
TRUEnever evaluated
FALSEevaluated 26 times by 2 tests
Evaluated by:
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0-26
130 error (0, ENAMETOOLONG, "%s", _("generating relative path"));
never executed: error (0, 36 , "%s", dcgettext (((void *)0), "generating relative path" , 5) );
0
131-
132 return !buf_err;
executed 26 times by 2 tests: return !buf_err;
Executed by:
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26
133}-
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