| 1 | /* |
| 2 | * Copyright (c) 1989 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to Berkeley by |
| 6 | * Ozan Yigit. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. All advertising materials mentioning features or use of this software |
| 17 | * must display the following acknowledgement: |
| 18 | * This product includes software developed by the University of |
| 19 | * California, Berkeley and its contributors. |
| 20 | * 4. Neither the name of the University nor the names of its contributors |
| 21 | * may be used to endorse or promote products derived from this software |
| 22 | * without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #ifndef lint |
| 38 | static char sccsid[] = "@(#)eval.c 5.4 (Berkeley) 2/26/91"; |
| 39 | #endif /* not lint */ |
| 40 | |
| 41 | /* |
| 42 | * eval.c |
| 43 | * Facility: m4 macro processor |
| 44 | * by: oz |
| 45 | */ |
| 46 | |
| 47 | #include <unistd.h> |
| 48 | #include <stdio.h> |
| 49 | #include <stdlib.h> |
| 50 | #include <string.h> |
| 51 | #include "mdef.h" |
| 52 | #include "extr.h" |
| 53 | |
| 54 | extern ndptr lookup(); |
| 55 | |
| 56 | /* |
| 57 | * eval - evaluate built-in macros. |
| 58 | * argc - number of elements in argv. |
| 59 | * argv - element vector : |
| 60 | * argv[0] = definition of a user |
| 61 | * macro or nil if built-in. |
| 62 | * argv[1] = name of the macro or |
| 63 | * built-in. |
| 64 | * argv[2] = parameters to user-defined |
| 65 | * . macro or built-in. |
| 66 | * . |
| 67 | * |
| 68 | * Note that the minimum value for argc is 3. A call in the form |
| 69 | * of macro-or-builtin() will result in: |
| 70 | * argv[0] = nullstr |
| 71 | * argv[1] = macro-or-builtin |
| 72 | * argv[2] = nullstr |
| 73 | * |
| 74 | */ |
| 75 | |
| 76 | eval (argv, argc, td) |
| 77 | register char *argv[]; |
| 78 | register int argc; |
| 79 | register int td; |
| 80 | { |
| 81 | register int c, n; |
| 82 | static int sysval; |
| 83 | |
| 84 | #ifdef DEBUG |
| 85 | printf("argc = %d\n", argc); |
| 86 | for (n = 0; n < argc; n++) |
| 87 | printf("argv[%d] = %s\n", n, argv[n]); |
| 88 | #endif |
| 89 | /* |
| 90 | * if argc == 3 and argv[2] is null, |
| 91 | * then we have macro-or-builtin() type call. |
| 92 | * We adjust argc to avoid further checking.. |
| 93 | * |
| 94 | */ |
| 95 | if (argc == 3 && !*(argv[2])) |
| 96 | argc--; |
| 97 | |
| 98 | switch (td & ~STATIC) { |
| 99 | |
| 100 | case DEFITYPE: |
| 101 | if (argc > 2) |
| 102 | dodefine(argv[2], (argc > 3) ? argv[3] : null); |
| 103 | break; |
| 104 | |
| 105 | case PUSDTYPE: |
| 106 | if (argc > 2) |
| 107 | dopushdef(argv[2], (argc > 3) ? argv[3] : null); |
| 108 | break; |
| 109 | |
| 110 | case DUMPTYPE: |
| 111 | dodump(argv, argc); |
| 112 | break; |
| 113 | |
| 114 | case EXPRTYPE: |
| 115 | /* |
| 116 | * doexpr - evaluate arithmetic expression |
| 117 | * |
| 118 | */ |
| 119 | if (argc > 2) |
| 120 | pbnum(expr(argv[2])); |
| 121 | break; |
| 122 | |
| 123 | case IFELTYPE: |
| 124 | if (argc > 4) |
| 125 | doifelse(argv, argc); |
| 126 | break; |
| 127 | |
| 128 | case IFDFTYPE: |
| 129 | /* |
| 130 | * doifdef - select one of two alternatives based |
| 131 | * on the existence of another definition |
| 132 | */ |
| 133 | if (argc > 3) { |
| 134 | if (lookup(argv[2]) != nil) |
| 135 | pbstr(argv[3]); |
| 136 | else if (argc > 4) |
| 137 | pbstr(argv[4]); |
| 138 | } |
| 139 | break; |
| 140 | |
| 141 | case LENGTYPE: |
| 142 | /* |
| 143 | * dolen - find the length of the argument |
| 144 | * |
| 145 | */ |
| 146 | if (argc > 2) |
| 147 | pbnum((argc > 2) ? strlen(argv[2]) : 0); |
| 148 | break; |
| 149 | |
| 150 | case INCRTYPE: |
| 151 | /* |
| 152 | * doincr - increment the value of the argument |
| 153 | * |
| 154 | */ |
| 155 | if (argc > 2) |
| 156 | pbnum(atoi(argv[2]) + 1); |
| 157 | break; |
| 158 | |
| 159 | case DECRTYPE: |
| 160 | /* |
| 161 | * dodecr - decrement the value of the argument |
| 162 | * |
| 163 | */ |
| 164 | if (argc > 2) |
| 165 | pbnum(atoi(argv[2]) - 1); |
| 166 | break; |
| 167 | |
| 168 | case SYSCTYPE: |
| 169 | /* |
| 170 | * dosys - execute system command |
| 171 | * |
| 172 | */ |
| 173 | if (argc > 2) |
| 174 | sysval = system(argv[2]); |
| 175 | break; |
| 176 | |
| 177 | case SYSVTYPE: |
| 178 | /* |
| 179 | * dosysval - return value of the last system call. |
| 180 | * |
| 181 | */ |
| 182 | pbnum(sysval); |
| 183 | break; |
| 184 | |
| 185 | case INCLTYPE: |
| 186 | if (argc > 2) |
| 187 | if (!doincl(argv[2])) { |
| 188 | fprintf(stderr,"m4: %s: ",argv[2]); |
| 189 | error("cannot open for read."); |
| 190 | } |
| 191 | break; |
| 192 | |
| 193 | case SINCTYPE: |
| 194 | if (argc > 2) |
| 195 | (void) doincl(argv[2]); |
| 196 | break; |
| 197 | #ifdef EXTENDED |
| 198 | case PASTTYPE: |
| 199 | if (argc > 2) |
| 200 | if (!dopaste(argv[2])) { |
| 201 | fprintf(stderr,"m4: %s: ",argv[2]); |
| 202 | error("cannot open for read."); |
| 203 | } |
| 204 | break; |
| 205 | |
| 206 | case SPASTYPE: |
| 207 | if (argc > 2) |
| 208 | (void) dopaste(argv[2]); |
| 209 | break; |
| 210 | #endif |
| 211 | case CHNQTYPE: |
| 212 | dochq(argv, argc); |
| 213 | break; |
| 214 | |
| 215 | case CHNCTYPE: |
| 216 | dochc(argv, argc); |
| 217 | break; |
| 218 | |
| 219 | case SUBSTYPE: |
| 220 | /* |
| 221 | * dosub - select substring |
| 222 | * |
| 223 | */ |
| 224 | if (argc > 3) |
| 225 | dosub(argv,argc); |
| 226 | break; |
| 227 | |
| 228 | case SHIFTYPE: |
| 229 | /* |
| 230 | * doshift - push back all arguments except the |
| 231 | * first one (i.e. skip argv[2]) |
| 232 | */ |
| 233 | if (argc > 3) { |
| 234 | for (n = argc-1; n > 3; n--) { |
| 235 | putback(rquote); |
| 236 | pbstr(argv[n]); |
| 237 | putback(lquote); |
| 238 | putback(','); |
| 239 | } |
| 240 | putback(rquote); |
| 241 | pbstr(argv[3]); |
| 242 | putback(lquote); |
| 243 | } |
| 244 | break; |
| 245 | |
| 246 | case DIVRTYPE: |
| 247 | if (argc > 2 && (n = atoi(argv[2])) != 0) |
| 248 | dodiv(n); |
| 249 | else { |
| 250 | active = stdout; |
| 251 | oindex = 0; |
| 252 | } |
| 253 | break; |
| 254 | |
| 255 | case UNDVTYPE: |
| 256 | doundiv(argv, argc); |
| 257 | break; |
| 258 | |
| 259 | case DIVNTYPE: |
| 260 | /* |
| 261 | * dodivnum - return the number of current |
| 262 | * output diversion |
| 263 | * |
| 264 | */ |
| 265 | pbnum(oindex); |
| 266 | break; |
| 267 | |
| 268 | case UNDFTYPE: |
| 269 | /* |
| 270 | * doundefine - undefine a previously defined |
| 271 | * macro(s) or m4 keyword(s). |
| 272 | */ |
| 273 | if (argc > 2) |
| 274 | for (n = 2; n < argc; n++) |
| 275 | remhash(argv[n], ALL); |
| 276 | break; |
| 277 | |
| 278 | case POPDTYPE: |
| 279 | /* |
| 280 | * dopopdef - remove the topmost definitions of |
| 281 | * macro(s) or m4 keyword(s). |
| 282 | */ |
| 283 | if (argc > 2) |
| 284 | for (n = 2; n < argc; n++) |
| 285 | remhash(argv[n], TOP); |
| 286 | break; |
| 287 | |
| 288 | case MKTMTYPE: |
| 289 | /* |
| 290 | * dotemp - create a temporary file |
| 291 | * |
| 292 | */ |
| 293 | if (argc > 2) |
| 294 | pbstr(mktemp(argv[2])); |
| 295 | break; |
| 296 | |
| 297 | case TRNLTYPE: |
| 298 | /* |
| 299 | * dotranslit - replace all characters in the |
| 300 | * source string that appears in |
| 301 | * the "from" string with the corresponding |
| 302 | * characters in the "to" string. |
| 303 | * |
| 304 | */ |
| 305 | if (argc > 3) { |
| 306 | char temp[MAXTOK]; |
| 307 | if (argc > 4) |
| 308 | map(temp, argv[2], argv[3], argv[4]); |
| 309 | else |
| 310 | map(temp, argv[2], argv[3], null); |
| 311 | pbstr(temp); |
| 312 | } |
| 313 | else |
| 314 | if (argc > 2) |
| 315 | pbstr(argv[2]); |
| 316 | break; |
| 317 | |
| 318 | case INDXTYPE: |
| 319 | /* |
| 320 | * doindex - find the index of the second argument |
| 321 | * string in the first argument string. |
| 322 | * -1 if not present. |
| 323 | */ |
| 324 | pbnum((argc > 3) ? indx(argv[2], argv[3]) : -1); |
| 325 | break; |
| 326 | |
| 327 | case ERRPTYPE: |
| 328 | /* |
| 329 | * doerrp - print the arguments to stderr file |
| 330 | * |
| 331 | */ |
| 332 | if (argc > 2) { |
| 333 | for (n = 2; n < argc; n++) |
| 334 | fprintf(stderr,"%s ", argv[n]); |
| 335 | fprintf(stderr, "\n"); |
| 336 | } |
| 337 | break; |
| 338 | |
| 339 | case DNLNTYPE: |
| 340 | /* |
| 341 | * dodnl - eat-up-to and including newline |
| 342 | * |
| 343 | */ |
| 344 | while ((c = gpbc()) != '\n' && c != EOF) |
| 345 | ; |
| 346 | break; |
| 347 | |
| 348 | case M4WRTYPE: |
| 349 | /* |
| 350 | * dom4wrap - set up for wrap-up/wind-down activity |
| 351 | * |
| 352 | */ |
| 353 | m4wraps = (argc > 2) ? strdup(argv[2]) : null; |
| 354 | break; |
| 355 | |
| 356 | case EXITTYPE: |
| 357 | /* |
| 358 | * doexit - immediate exit from m4. |
| 359 | * |
| 360 | */ |
| 361 | exit((argc > 2) ? atoi(argv[2]) : 0); |
| 362 | break; |
| 363 | |
| 364 | case DEFNTYPE: |
| 365 | if (argc > 2) |
| 366 | for (n = 2; n < argc; n++) |
| 367 | dodefn(argv[n]); |
| 368 | break; |
| 369 | |
| 370 | default: |
| 371 | error("m4: major botch in eval."); |
| 372 | break; |
| 373 | } |
| 374 | } |