1 /* c-strcasecmp.c -- case insensitive string comparator in C locale
2 Copyright (C) 1998-1999, 2005-2006, 2009-2021 Free Software Foundation, Inc.
4 Character handling in C locale.
5 Copyright (C) 2000-2003, 2006, 2008-2021 Free Software Foundation, Inc.
7 Stripped down copy of gnulib c-ctype and c-strcasecmp modules for
8 conditional fallback use.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, see <https://www.gnu.org/licenses/>. */
26 #undef HAVE_G_ASCII_STRCASECMP
29 /* The functions defined in this file assume the "C" locale and a character
30 set without diacritics (ASCII-US or EBCDIC-US or something like that).
31 Even if the "C" locale on a particular system is an extension of the ASCII
32 character set (like on BeOS, where it is UTF-8, or on AmigaOS, where it
33 is ISO-8859-1), the functions in this file recognize only the ASCII
36 #if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
37 && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
38 && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
39 && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
40 && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
41 && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
42 && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
43 && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
44 && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
45 && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
46 && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
47 && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
48 && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
49 && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
50 && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
51 && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
52 && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
53 && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
54 && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
55 && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
56 && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
57 && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
58 && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126)
59 /* The character set is ASCII or one of its variants or extensions, not EBCDIC.
60 Testing the value of '\n' and '\r' is not relevant. */
61 # define C_CTYPE_ASCII 1
62 #elif ! (' ' == '\x40' && '0' == '\xf0' \
63 && 'A' == '\xc1' && 'J' == '\xd1' && 'S' == '\xe2' \
64 && 'a' == '\x81' && 'j' == '\x91' && 's' == '\xa2')
65 # error "Only ASCII and EBCDIC are supported"
69 # error "EBCDIC and char is signed -- not supported"
72 /* Cases for lowercase hex letters, and lowercase letters, all offset by N. */
74 #define C_CTYPE_LOWER_A_THRU_F_N(N) \
75 case 'a' + (N): case 'b' + (N): case 'c' + (N): case 'd' + (N): \
76 case 'e' + (N): case 'f' + (N)
77 #define C_CTYPE_LOWER_N(N) \
78 C_CTYPE_LOWER_A_THRU_F_N(N): \
79 case 'g' + (N): case 'h' + (N): case 'i' + (N): case 'j' + (N): \
80 case 'k' + (N): case 'l' + (N): case 'm' + (N): case 'n' + (N): \
81 case 'o' + (N): case 'p' + (N): case 'q' + (N): case 'r' + (N): \
82 case 's' + (N): case 't' + (N): case 'u' + (N): case 'v' + (N): \
83 case 'w' + (N): case 'x' + (N): case 'y' + (N): case 'z' + (N)
85 #define C_CTYPE_LOWER C_CTYPE_LOWER_N(0)
86 #define C_CTYPE_UPPER C_CTYPE_LOWER_N ('A' - 'a')
89 /* Function definitions. */
91 /* Unlike the functions in <ctype.h>, which require an argument in the range
92 of the 'unsigned char' type, the functions here operate on values that are
93 in the 'unsigned char' range or in the 'char' range. In other words,
94 when you have a 'char' value, you need to cast it before using it as
95 argument to a <ctype.h> function:
98 if (isalpha ((unsigned char) *s)) ...
100 but you don't need to cast it for the functions defined in this file:
103 if (c_isalpha (*s)) ...
106 static int c_tolower(int c)
110 return c - 'A' + 'a';
116 static int c_toupper(int c)
120 return c - 'a' + 'A';
126 char *gob_strup(char *str)
130 for (s = str; *s; s++)
136 char *gob_strdown(char *str)
140 for (s = str; *s; s++)
146 int gob_strcasecmp(const char *s1, const char *s2)
148 register const unsigned char *p1 = (const unsigned char *)s1;
149 register const unsigned char *p2 = (const unsigned char *)s2;
150 unsigned char c1, c2;
156 c1 = c_tolower (*p1);
157 c2 = c_tolower (*p2);
166 if (UCHAR_MAX <= INT_MAX) {
170 * On machines where 'char' and 'int' are types of the
171 * same size, the difference of two 'unsigned char' values
172 * - including the sign bit - doesn't fit in an 'int'.
174 return _GL_CMP (c1, c2);