| 1 | /* Merge parameters into a termcap entry string. |
| 2 | Copyright (C) 1985, 1987, 1993, 1995, 2000, 2001, 2002, 2003, 2004, |
| 3 | 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2, or (at your option) |
| 8 | any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; see the file COPYING. If not, write to |
| 17 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 18 | Boston, MA 02110-1301, USA. */ |
| 19 | |
| 20 | /* Emacs config.h may rename various library functions such as malloc. */ |
| 21 | #include <config.h> |
| 22 | #include <setjmp.h> |
| 23 | #include "lisp.h" /* for xmalloc */ |
| 24 | #include "tparam.h" |
| 25 | |
| 26 | #ifndef NULL |
| 27 | #define NULL (char *) 0 |
| 28 | #endif |
| 29 | \f |
| 30 | /* Assuming STRING is the value of a termcap string entry |
| 31 | containing `%' constructs to expand parameters, |
| 32 | merge in parameter values and store result in block OUTSTRING points to. |
| 33 | LEN is the length of OUTSTRING. If more space is needed, |
| 34 | a block is allocated with `malloc'. |
| 35 | |
| 36 | The value returned is the address of the resulting string. |
| 37 | This may be OUTSTRING or may be the address of a block got with `malloc'. |
| 38 | In the latter case, the caller must free the block. |
| 39 | |
| 40 | The fourth and following args to tparam serve as the parameter values. */ |
| 41 | |
| 42 | static char *tparam1 (char const *string, char *outstring, int len, |
| 43 | char *up, char *left, int *argp); |
| 44 | |
| 45 | char * |
| 46 | tparam (const char *string, char *outstring, int len, |
| 47 | int arg0, int arg1, int arg2, int arg3) |
| 48 | { |
| 49 | int arg[4]; |
| 50 | |
| 51 | arg[0] = arg0; |
| 52 | arg[1] = arg1; |
| 53 | arg[2] = arg2; |
| 54 | arg[3] = arg3; |
| 55 | return tparam1 (string, outstring, len, NULL, NULL, arg); |
| 56 | } |
| 57 | |
| 58 | char *BC; |
| 59 | char *UP; |
| 60 | |
| 61 | static char tgoto_buf[50]; |
| 62 | |
| 63 | char * |
| 64 | tgoto (const char *cm, int hpos, int vpos) |
| 65 | { |
| 66 | int args[2]; |
| 67 | if (!cm) |
| 68 | return NULL; |
| 69 | args[0] = vpos; |
| 70 | args[1] = hpos; |
| 71 | return tparam1 (cm, tgoto_buf, 50, UP, BC, args); |
| 72 | } |
| 73 | |
| 74 | static char * |
| 75 | tparam1 (const char *string, char *outstring, int len, |
| 76 | char *up, char *left, register int *argp) |
| 77 | { |
| 78 | register int c; |
| 79 | register const char *p = string; |
| 80 | register char *op = outstring; |
| 81 | char *outend; |
| 82 | char *new = 0; |
| 83 | ptrdiff_t outlen = 0; |
| 84 | |
| 85 | register int tem; |
| 86 | int *old_argp = argp; /* can move */ |
| 87 | int *fixed_argp = argp; /* never moves */ |
| 88 | int explicit_param_p = 0; /* set by %p */ |
| 89 | ptrdiff_t doleft = 0; |
| 90 | ptrdiff_t doup = 0; |
| 91 | ptrdiff_t append_len = 0; |
| 92 | |
| 93 | outend = outstring + len; |
| 94 | |
| 95 | while (1) |
| 96 | { |
| 97 | /* If the buffer might be too short, make it bigger. */ |
| 98 | while (outend - op - append_len <= 5) |
| 99 | { |
| 100 | ptrdiff_t offset = op - outstring; |
| 101 | |
| 102 | if (outlen == 0) |
| 103 | { |
| 104 | outlen = len + 40; |
| 105 | new = (char *) xmalloc (outlen); |
| 106 | memcpy (new, outstring, offset); |
| 107 | } |
| 108 | else |
| 109 | { |
| 110 | new = xpalloc (outstring, &outlen, 1, -1, 1); |
| 111 | } |
| 112 | |
| 113 | op = new + offset; |
| 114 | outend = new + outlen; |
| 115 | outstring = new; |
| 116 | } |
| 117 | c = *p++; |
| 118 | if (!c) |
| 119 | break; |
| 120 | if (c == '%') |
| 121 | { |
| 122 | c = *p++; |
| 123 | if (explicit_param_p) |
| 124 | explicit_param_p = 0; |
| 125 | else |
| 126 | tem = *argp; |
| 127 | switch (c) |
| 128 | { |
| 129 | case 'd': /* %d means output in decimal. */ |
| 130 | if (tem < 10) |
| 131 | goto onedigit; |
| 132 | if (tem < 100) |
| 133 | goto twodigit; |
| 134 | case '3': /* %3 means output in decimal, 3 digits. */ |
| 135 | if (tem > 999) |
| 136 | { |
| 137 | *op++ = tem / 1000 + '0'; |
| 138 | tem %= 1000; |
| 139 | } |
| 140 | *op++ = tem / 100 + '0'; |
| 141 | case '2': /* %2 means output in decimal, 2 digits. */ |
| 142 | twodigit: |
| 143 | tem %= 100; |
| 144 | *op++ = tem / 10 + '0'; |
| 145 | onedigit: |
| 146 | *op++ = tem % 10 + '0'; |
| 147 | argp++; |
| 148 | break; |
| 149 | case 'p': /* %pN means use param N for next subst. */ |
| 150 | tem = fixed_argp[(*p++) - '1']; |
| 151 | explicit_param_p = 1; |
| 152 | break; |
| 153 | case 'C': |
| 154 | /* For c-100: print quotient of value by 96, if nonzero, |
| 155 | then do like %+. */ |
| 156 | if (tem >= 96) |
| 157 | { |
| 158 | *op++ = tem / 96; |
| 159 | tem %= 96; |
| 160 | } |
| 161 | case '+': /* %+x means add character code of char x. */ |
| 162 | tem += *p++; |
| 163 | case '.': /* %. means output as character. */ |
| 164 | if (left) |
| 165 | { |
| 166 | /* If want to forbid output of 0 and \n and \t, |
| 167 | and this is one of them, increment it. */ |
| 168 | while (tem == 0 || tem == '\n' || tem == '\t') |
| 169 | { |
| 170 | ptrdiff_t append_len_incr; |
| 171 | tem++; |
| 172 | if (argp == old_argp) |
| 173 | doup++, append_len_incr = strlen (up); |
| 174 | else |
| 175 | doleft++, append_len_incr = strlen (left); |
| 176 | if (INT_ADD_OVERFLOW (append_len, append_len_incr)) |
| 177 | memory_full (SIZE_MAX); |
| 178 | append_len += append_len_incr; |
| 179 | } |
| 180 | } |
| 181 | *op++ = tem ? tem : 0200; |
| 182 | case 'f': /* %f means discard next arg. */ |
| 183 | argp++; |
| 184 | break; |
| 185 | |
| 186 | case 'b': /* %b means back up one arg (and re-use it). */ |
| 187 | argp--; |
| 188 | break; |
| 189 | |
| 190 | case 'r': /* %r means interchange following two args. */ |
| 191 | argp[0] = argp[1]; |
| 192 | argp[1] = tem; |
| 193 | old_argp++; |
| 194 | break; |
| 195 | |
| 196 | case '>': /* %>xy means if arg is > char code of x, */ |
| 197 | if (argp[0] > *p++) /* then add char code of y to the arg, */ |
| 198 | argp[0] += *p; /* and in any case don't output. */ |
| 199 | p++; /* Leave the arg to be output later. */ |
| 200 | break; |
| 201 | |
| 202 | case 'a': /* %a means arithmetic. */ |
| 203 | /* Next character says what operation. |
| 204 | Add or subtract either a constant or some other arg. */ |
| 205 | /* First following character is + to add or - to subtract |
| 206 | or = to assign. */ |
| 207 | /* Next following char is 'p' and an arg spec |
| 208 | (0100 plus position of that arg relative to this one) |
| 209 | or 'c' and a constant stored in a character. */ |
| 210 | tem = p[2] & 0177; |
| 211 | if (p[1] == 'p') |
| 212 | tem = argp[tem - 0100]; |
| 213 | if (p[0] == '-') |
| 214 | argp[0] -= tem; |
| 215 | else if (p[0] == '+') |
| 216 | argp[0] += tem; |
| 217 | else if (p[0] == '*') |
| 218 | argp[0] *= tem; |
| 219 | else if (p[0] == '/') |
| 220 | argp[0] /= tem; |
| 221 | else |
| 222 | argp[0] = tem; |
| 223 | |
| 224 | p += 3; |
| 225 | break; |
| 226 | |
| 227 | case 'i': /* %i means add one to arg, */ |
| 228 | argp[0] ++; /* and leave it to be output later. */ |
| 229 | argp[1] ++; /* Increment the following arg, too! */ |
| 230 | break; |
| 231 | |
| 232 | case '%': /* %% means output %; no arg. */ |
| 233 | goto ordinary; |
| 234 | |
| 235 | case 'n': /* %n means xor each of next two args with 140. */ |
| 236 | argp[0] ^= 0140; |
| 237 | argp[1] ^= 0140; |
| 238 | break; |
| 239 | |
| 240 | case 'm': /* %m means xor each of next two args with 177. */ |
| 241 | argp[0] ^= 0177; |
| 242 | argp[1] ^= 0177; |
| 243 | break; |
| 244 | |
| 245 | case 'B': /* %B means express arg as BCD char code. */ |
| 246 | argp[0] += 6 * (tem / 10); |
| 247 | break; |
| 248 | |
| 249 | case 'D': /* %D means weird Delta Data transformation. */ |
| 250 | argp[0] -= 2 * (tem % 16); |
| 251 | break; |
| 252 | |
| 253 | default: |
| 254 | abort (); |
| 255 | } |
| 256 | } |
| 257 | else |
| 258 | /* Ordinary character in the argument string. */ |
| 259 | ordinary: |
| 260 | *op++ = c; |
| 261 | } |
| 262 | *op = 0; |
| 263 | while (doup-- > 0) |
| 264 | strcat (op, up); |
| 265 | while (doleft-- > 0) |
| 266 | strcat (op, left); |
| 267 | return outstring; |
| 268 | } |
| 269 | \f |
| 270 | #ifdef DEBUG |
| 271 | |
| 272 | int |
| 273 | main (int argc, char **argv) |
| 274 | { |
| 275 | char buf[50]; |
| 276 | int args[3]; |
| 277 | args[0] = atoi (argv[2]); |
| 278 | args[1] = atoi (argv[3]); |
| 279 | args[2] = atoi (argv[4]); |
| 280 | tparam1 (argv[1], buf, 50, "LEFT", "UP", args); |
| 281 | printf ("%s\n", buf); |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | #endif /* DEBUG */ |