OpenCoverage

memcoll.c

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/home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/memcoll.c

Source code

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1 /* Locale-specific memory comparison. -

2 -

4 Inc. -

5 -

6 This program is free software: you can redistribute it and/or modify -

7 it under the terms of the GNU General Public License as published by -

8 the Free Software Foundation; either version 3 of the License, or -

9 (at your option) any later version. -

10 -

11 This program is distributed in the hope that it will be useful, -

12 but WITHOUT ANY WARRANTY; without even the implied warranty of -

13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -

14 GNU General Public License for more details. -

15 -

16 You should have received a copy of the GNU General Public License -

17 along with this program. If not, see <https://www.gnu.org/licenses/>. */ -

18 -

19 /* Contributed by Paul Eggert <eggert@twinsun.com>. */ -

20 -

21 #include <config.h> -

22 -

23 #include "memcoll.h" -

24 -

25 #include <errno.h> -

26 #include <stdlib.h> -

27 #include <string.h> -

28 -

29 /* Compare S1 (with size S1SIZE) and S2 (with length S2SIZE) according -

30 to the LC_COLLATE locale. S1 and S2 are both blocks of memory with -

31 nonzero sizes, and the last byte in each block must be a null byte. -

32 Set errno to an error number if there is an error, and to zero -

33 otherwise. */ -

34 static int -

35 strcoll_loop (char const *s1, size_t s1size, char const *s2, size_t s2size) -

36 { -

37 int diff; -

38 -

while (! (errno = 0, (diff = strcoll (s1, s2)) || errno))

(diff = strcoll (s1, s2))	Description
TRUE	never evaluated
FALSE	never evaluated

(*__errno_location ())	Description
TRUE	never evaluated
FALSE	never evaluated

40 { -

41 /* strcoll found no difference, but perhaps it was fooled by NUL -

42 characters in the data. Work around this problem by advancing -

43 past the NUL chars. */ -

44 size_t size1 = strlen (s1) + 1; -

45 size_t size2 = strlen (s2) + 1; -

46 s1 += size1; -

47 s2 += size2; -

48 s1size -= size1; -

49 s2size -= size2; -

50 -

if (s1size == 0)

s1size == 0	Description
TRUE	never evaluated
FALSE	never evaluated

return - (s2size != 0);

never executed: return - (s2size != 0);

if (s2size == 0)

s2size == 0	Description
TRUE	never evaluated
FALSE	never evaluated

return 1;

never executed: return 1;

}

never executed: end of block

56 -

return diff;

never executed: return diff;

58 } -

59 -

60 /* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according -

61 to the LC_COLLATE locale. S1 and S2 do not overlap, and are not -

62 adjacent. Perhaps temporarily modify the bytes after S1 and S2, -

63 but restore their original contents before returning. Set errno to an -

64 error number if there is an error, and to zero otherwise. */ -

65 int -

66 memcoll (char *s1, size_t s1len, char *s2, size_t s2len) -

67 { -

68 int diff; -

69 -

70 /* strcoll is slow on many platforms, so check for the common case -

71 where the arguments are bytewise equal. Otherwise, walk through -

72 the buffers using strcoll on each substring. */ -

73 -

if (s1len == s2len && memcmp (s1, s2, s1len) == 0)

s1len == s2len	Description
TRUE	never evaluated
FALSE	never evaluated

memcmp (s1, s2, s1len) == 0	Description
TRUE	never evaluated
FALSE	never evaluated

75 { -

76 errno = 0; -

77 diff = 0; -

}

never executed: end of block

79 else -

80 { -

81 char n1 = s1[s1len]; -

82 char n2 = s2[s2len]; -

83 -

84 s1[s1len] = '\0'; -

85 s2[s2len] = '\0'; -

86 -

87 diff = strcoll_loop (s1, s1len + 1, s2, s2len + 1); -

88 -

89 s1[s1len] = n1; -

90 s2[s2len] = n2; -

}

never executed: end of block

92 -

return diff;

never executed: return diff;

94 } -

95 -

96 /* Compare S1 (a memory block of size S1SIZE, with a NUL as last byte) -

97 and S2 (a memory block of size S2SIZE, with a NUL as last byte) -

98 according to the LC_COLLATE locale. S1SIZE and S2SIZE must be > 0. -

99 Set errno to an error number if there is an error, and to zero -

100 otherwise. */ -

101 int -

102 memcoll0 (char const *s1, size_t s1size, char const *s2, size_t s2size) -

103 { -

104

if (s1size == s2size && memcmp (s1, s2, s1size) == 0)

s1size == s2size	Description
TRUE	never evaluated
FALSE	never evaluated

memcmp (s1, s2, s1size) == 0	Description
TRUE	never evaluated
FALSE	never evaluated

105 { -

106 errno = 0; -

107

return 0;

never executed: return 0;

108 } -

109 else -

110

return strcoll_loop (s1, s1size, s2, s2size);

never executed: return strcoll_loop (s1, s1size, s2, s2size);

111 } -

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