| 1 | /* |
| 2 | jcode.c: Kanji-code detect routing by Jun Nishii <jun@vinelinux.org> |
| 3 | modified by Ryoichi INAGAKI <inagaki@vinelinux.org> |
| 4 | */ |
| 5 | #include <stdio.h> |
| 6 | #include <unistd.h> |
| 7 | #include <signal.h> |
| 8 | #include <sys/types.h> |
| 9 | #include <sys/wait.h> |
| 10 | #include <jcode.h> |
| 11 | |
| 12 | typedef unsigned long unichar; |
| 13 | |
| 14 | #define F 0 /* character never appears in text */ |
| 15 | #define T 1 /* character appears in plain ASCII text */ |
| 16 | #define I 2 /* character appears in ISO-8859 text */ |
| 17 | #define X 3 /* character appears in non-ISO extended ASCII (Mac, IBM PC) */ |
| 18 | #define J 4 /* character appears in JIS or plain ASCII */ |
| 19 | #define S 5 /* character appears in SJIS */ |
| 20 | #define E 6 /* character appears in EUC */ |
| 21 | #define O 7 /* character appears in EUC or SJIS */ |
| 22 | |
| 23 | #define ESC 27 |
| 24 | |
| 25 | static char jp_chars1[256] = { |
| 26 | F, F, F, F, F, F, F, T, T, T, T, F, T, T, F, F, /* 0x0X */ |
| 27 | F, F, F, F, F, F, F, F, F, F, F, T, F, F, F, F, /* 0x1X */ |
| 28 | T, J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, /* 0x2X */ |
| 29 | J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, /* 0x3X */ |
| 30 | J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, /* 0x4X */ |
| 31 | J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, /* 0x5X */ |
| 32 | J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, /* 0x6X */ |
| 33 | J, J, J, J, J, J, J, J, J, J, J, J, J, J, J, F, /* 0x7X */ |
| 34 | /* NEL */ |
| 35 | X, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, /* 0x8X */ |
| 36 | S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, /* 0x9X */ |
| 37 | I, E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, /* 0xaX */ |
| 38 | E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, /* 0xbX */ |
| 39 | E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, /* 0xcX */ |
| 40 | E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, /* 0xdX */ |
| 41 | O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, /* 0xeX */ |
| 42 | E, E, E, E, E, E, E, E, E, E, E, E, E, E, E, I /* 0xfX */ |
| 43 | }; |
| 44 | |
| 45 | static char jp_chars2[256] = { |
| 46 | /* BEL BS HT LF FF CR */ |
| 47 | F, F, F, F, F, F, F, T, T, T, T, F, T, T, F, F, /* 0x0X */ |
| 48 | /* ESC */ |
| 49 | F, F, F, F, F, F, F, F, F, F, F, T, F, F, F, F, /* 0x1X */ |
| 50 | T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x2X */ |
| 51 | T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, /* 0x3X */ |
| 52 | S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, /* 0x4X */ |
| 53 | S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, /* 0x5X */ |
| 54 | S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, /* 0x6X */ |
| 55 | S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, F, /* 0x7X */ |
| 56 | /* NEL */ |
| 57 | S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, /* 0x8X */ |
| 58 | S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, /* 0x9X */ |
| 59 | S, O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, /* 0xaX */ |
| 60 | O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, /* 0xbX */ |
| 61 | O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, /* 0xcX */ |
| 62 | O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, /* 0xdX */ |
| 63 | O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, O, /* 0xeX */ |
| 64 | O, O, O, O, O, O, O, O, O, O, O, O, O, E, E, I /* 0xfX */ |
| 65 | }; |
| 66 | |
| 67 | |
| 68 | int |
| 69 | check_asc_jis(buf, nbytes, ubuf, ulen) |
| 70 | const unsigned char *buf; |
| 71 | size_t nbytes; |
| 72 | unichar *ubuf; |
| 73 | size_t *ulen; |
| 74 | { |
| 75 | size_t i; |
| 76 | int jflag; |
| 77 | |
| 78 | *ulen = 0; jflag=0; |
| 79 | |
| 80 | for (i = 0; i < nbytes; i++) { |
| 81 | int t = jp_chars1[buf[i]]; |
| 82 | |
| 83 | if (t != T && t != J ) |
| 84 | return 0; |
| 85 | |
| 86 | if (buf[i] == ESC && i+2<nbytes) { |
| 87 | if ((buf[i+1]=='$' && buf[i+2]=='B')|| |
| 88 | (buf[i+1]=='$' && buf[i+2]=='@')) jflag=1; |
| 89 | } |
| 90 | |
| 91 | ubuf[(*ulen)++] = buf[i]; |
| 92 | } |
| 93 | |
| 94 | if (jflag==1) return JIS; |
| 95 | else return ASCII; |
| 96 | } |
| 97 | |
| 98 | int |
| 99 | check_sjis(buf, nbytes, ubuf, ulen) |
| 100 | const unsigned char *buf; |
| 101 | size_t nbytes; |
| 102 | unichar *ubuf; |
| 103 | size_t *ulen; |
| 104 | { |
| 105 | size_t i; |
| 106 | int jflag; |
| 107 | |
| 108 | *ulen = 0; |
| 109 | jflag = ASCII; |
| 110 | for (i = 0; i < nbytes; i++) { |
| 111 | int t = jp_chars1[buf[i]]; |
| 112 | |
| 113 | if (t != T && t != J && t != S && t!= O) |
| 114 | return 0; |
| 115 | |
| 116 | if (t == S && i<nbytes-1){ |
| 117 | ubuf[(*ulen)++] = buf[i]; |
| 118 | ++i; |
| 119 | t=jp_chars2[buf[i]]; |
| 120 | if(t != S && t != O ) return 0; |
| 121 | jflag=SJIS; |
| 122 | } else if (t == O && i<nbytes-1){ |
| 123 | ubuf[(*ulen)++] = buf[i]; |
| 124 | ++i; |
| 125 | t=jp_chars2[buf[i]]; |
| 126 | if( t == S ){ jflag=SJIS; } |
| 127 | else if( t == O ){ if(jflag==ASCII) jflag=EUCORSJIS; } |
| 128 | else return 0; |
| 129 | } |
| 130 | |
| 131 | ubuf[(*ulen)++] = buf[i]; |
| 132 | } |
| 133 | #ifdef Z |
| 134 | if (jflag==SJIS) {ckfputs("SJIS text", stdout); return SJIS;} |
| 135 | if (jflag==EUCORSJIS) {ckfputs("EUCorSJIS", stdout); return EUCORSJIS;} |
| 136 | #else |
| 137 | if (jflag==SJIS) {return SJIS;} |
| 138 | if (jflag==EUCORSJIS) {return EUCORSJIS;} |
| 139 | #endif |
| 140 | } |
| 141 | |
| 142 | int |
| 143 | check_euc(buf, nbytes, ubuf, ulen) |
| 144 | const unsigned char *buf; |
| 145 | size_t nbytes; |
| 146 | unichar *ubuf; |
| 147 | size_t *ulen; |
| 148 | { |
| 149 | size_t i; |
| 150 | int jflag; |
| 151 | |
| 152 | *ulen = 0; |
| 153 | jflag = ASCII; |
| 154 | |
| 155 | for (i = 0; i < nbytes; i++) { |
| 156 | int t = jp_chars1[buf[i]]; |
| 157 | |
| 158 | if (t != T && t != J && t != E && t!= O) |
| 159 | return 0; |
| 160 | |
| 161 | if (t == E && i<nbytes-1){ |
| 162 | ubuf[(*ulen)++] = buf[i]; |
| 163 | ++i; |
| 164 | t= jp_chars2[buf[i]]; |
| 165 | if( t != E && t != O) return 0; |
| 166 | jflag=EUC; |
| 167 | } else if (t == O && i<nbytes-1){ |
| 168 | ubuf[(*ulen)++] = buf[i]; |
| 169 | ++i; |
| 170 | t=jp_chars2[buf[i]]; |
| 171 | if( t == E ){ jflag=EUC; } |
| 172 | else if( t == O ){ if(jflag==ASCII) jflag=EUCORSJIS; } |
| 173 | else return 0; |
| 174 | } |
| 175 | |
| 176 | ubuf[(*ulen)++] = buf[i]; |
| 177 | } |
| 178 | #ifdef Z |
| 179 | if (jflag==EUC) {ckfputs("EUC text", stdout); return EUC;} |
| 180 | if (jflag==EUCORSJIS) {ckfputs("EUCorSJIS", stdout); return EUCORSJIS;} |
| 181 | #else |
| 182 | if (jflag==EUC) { return EUC;} |
| 183 | if (jflag==EUCORSJIS) {return EUCORSJIS;} |
| 184 | #endif |
| 185 | } |
| 186 | |
| 187 | int |
| 188 | detect_kcode(buf, nbytes, ubuf, ulen) |
| 189 | const unsigned char *buf; |
| 190 | size_t nbytes; |
| 191 | unichar *ubuf; |
| 192 | size_t *ulen; |
| 193 | { |
| 194 | int ret; |
| 195 | ret=check_asc_jis(buf, nbytes, ubuf, ulen); |
| 196 | if(ret==ASCII) return ASCII; |
| 197 | if(ret==JIS) return JIS; |
| 198 | |
| 199 | ret=check_sjis(buf, nbytes, ubuf, ulen); |
| 200 | if(ret==SJIS) return SJIS; |
| 201 | if(ret==EUCORSJIS) return EUCORSJIS; |
| 202 | ret=check_euc(buf, nbytes, ubuf, ulen); |
| 203 | if(ret==EUC) return EUC; |
| 204 | if(ret==EUCORSJIS) return EUCORSJIS; |
| 205 | } |