1 /* $Header: /p/tcsh/cvsroot/tcsh/gethost.c,v 1.15 2012/01/15 17:14:54 christos Exp $ */ 2 /* 3 * gethost.c: Create version file from prototype 4 */ 5 /*- 6 * Copyright (c) 1980, 1991 The Regents of the University of California. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 #include "sh.h" 34 35 RCSID("$tcsh: gethost.c,v 1.15 2012/01/15 17:14:54 christos Exp $") 36 37 #ifdef SCO 38 # define perror __perror 39 # define rename __rename 40 # define getopt __getopt 41 # define system __system 42 #endif 43 #include <stdio.h> 44 #ifdef SCO 45 # undef perror 46 # undef rename 47 # undef getopt 48 # undef system 49 #endif 50 51 #include <ctype.h> 52 53 #define ISSPACE(p) (isspace((unsigned char) (p)) && (p) != '\n') 54 55 /* 56 * We cannot do that, because some compilers like #line and others 57 * like # <lineno> 58 * #define LINEDIRECTIVE 59 */ 60 61 static const char *keyword[] = 62 { 63 "vendor", 64 #define T_VENDOR 0 65 "hosttype", 66 #define T_HOSTTYPE 1 67 "machtype", 68 #define T_MACHTYPE 2 69 "ostype", 70 #define T_OSTYPE 3 71 "newdef", 72 #define T_NEWDEF 4 73 "enddef", 74 #define T_ENDDEF 5 75 "newcode", 76 #define T_NEWCODE 6 77 "endcode", 78 #define T_ENDCODE 7 79 "comment", 80 #define T_COMMENT 8 81 "macro", 82 #define T_MACRO 9 83 NULL 84 #define T_NONE 10 85 }; 86 87 #define S_DISCARD 0 88 #define S_COMMENT 1 89 #define S_CODE 2 90 #define S_KEYWORD 3 91 92 static int findtoken (char *); 93 static char *gettoken (char **, char *); 94 static char *pname; 95 96 int main (int, char *[]); 97 98 /* findtoken(): 99 * Return the token number of the given token 100 */ 101 static int 102 findtoken(char *ptr) 103 { 104 int i; 105 106 if (ptr == NULL || *ptr == '\0') 107 return T_NONE; 108 109 for (i = 0; keyword[i] != NULL; i++) 110 if (strcmp(keyword[i], ptr) == 0) 111 return i; 112 113 return T_NONE; 114 } 115 116 117 /* gettoken(): 118 * Get : delimited token and remove leading/trailing blanks/newlines 119 */ 120 static char * 121 gettoken(char **pptr, char *token) 122 { 123 char *ptr = *pptr; 124 char *tok = token; 125 126 for (; *ptr && ISSPACE(*ptr); ptr++) 127 continue; 128 129 for (; *ptr && *ptr != ':'; *tok++ = *ptr++) 130 continue; 131 132 if (*ptr == ':') 133 ptr++; 134 else 135 tok--; 136 137 for (tok--; tok >= token && *tok && ISSPACE(*tok); tok--) 138 continue; 139 140 *++tok = '\0'; 141 142 *pptr = ptr; 143 return token; 144 } 145 146 static char * 147 cat(const char *a, const char *b, size_t len) 148 { 149 size_t l; 150 char *r; 151 152 if (len == 0) 153 len = strlen(b); 154 l = strlen(a) + len + 1; 155 if ((r = malloc(l)) == NULL) 156 abort(); 157 snprintf(r, l, "%s%.*s", a, (int)len, b); 158 return r; 159 } 160 161 static const char * 162 explode(const char *defs) 163 { 164 static const char def[] = "defined("; /* ) */ 165 static char *buf; 166 size_t len; 167 const char *ptr, *bptr, *eptr = NULL, *name; 168 size_t buflen = 0; 169 170 if (strstr(defs, "#machine(" /* ) */)) 171 return defs; 172 173 free(buf); 174 buf = strdup("("); /* ) */ 175 for (ptr = defs; (bptr = strstr(ptr, def)) != NULL; ptr = eptr + 1) { 176 if (ptr != bptr) 177 buf = cat(buf, ptr, bptr - ptr); 178 if ((eptr = strchr(ptr + sizeof(def) - 1, ')')) == NULL) { 179 (void) fprintf(stderr, "%s: missing close paren `%s'\n", 180 pname, defs); 181 return defs; 182 } 183 buf = cat(buf, bptr, eptr - bptr + 1); 184 name = bptr + sizeof(def) - 1; 185 len = eptr - name; 186 if (len < 1) { 187 (void) fprintf(stderr, "%s: empty define `%s'\n", 188 pname, defs); 189 return defs; 190 } 191 if (*name != '_') { 192 char *undername = malloc(len + 10); 193 buf = cat(buf, " || defined(", 0); 194 snprintf(undername, len + 10, "__%.*s__)", (int)len, 195 name); 196 buf = cat(buf, undername, len + 5); 197 buf = cat(buf, " || defined(", 0); 198 snprintf(undername, len + 10, "__%.*s)", (int)len, 199 name); 200 buf = cat(buf, undername, len + 3); 201 } 202 } 203 if (!eptr) { 204 (void) fprintf(stderr, "%s: invalid input `%s'\n", pname, defs); 205 return defs; 206 } 207 buf = cat(buf, eptr + 1, 0); 208 buf = cat(buf, ")", 0); 209 return buf; 210 } 211 212 213 int 214 main(int argc, char *argv[]) 215 { 216 char line[INBUFSIZE]; 217 const char *fname = "stdin"; 218 char *ptr, *tok; 219 char defs[INBUFSIZE]; 220 char stmt[INBUFSIZE]; 221 FILE *fp = stdin; 222 int lineno = 0; 223 int inprocess = 0; 224 int token, state; 225 int errs = 0; 226 227 if ((pname = strrchr(argv[0], '/')) == NULL) 228 pname = argv[0]; 229 else 230 pname++; 231 232 if (argc > 2) { 233 (void) fprintf(stderr, "Usage: %s [<filename>]\n", pname); 234 return 1; 235 } 236 237 if (argc == 2) 238 if ((fp = fopen(fname = argv[1], "r")) == NULL) { 239 (void) fprintf(stderr, "%s: Cannot open `%s'\n", pname, fname); 240 return 1; 241 } 242 243 state = S_DISCARD; 244 245 while ((ptr = fgets(line, sizeof(line), fp)) != NULL) { 246 lineno++; 247 switch (token = findtoken(gettoken(&ptr, defs))) { 248 case T_NEWCODE: 249 state = S_CODE; 250 break; 251 252 case T_ENDCODE: 253 state = S_DISCARD; 254 break; 255 256 case T_COMMENT: 257 state = S_COMMENT; 258 break; 259 260 case T_NEWDEF: 261 state = S_KEYWORD; 262 break; 263 264 case T_ENDDEF: 265 state = S_DISCARD; 266 break; 267 268 case T_VENDOR: 269 state = S_KEYWORD; 270 break; 271 272 case T_HOSTTYPE: 273 state = S_KEYWORD; 274 break; 275 276 case T_MACHTYPE: 277 state = S_KEYWORD; 278 break; 279 280 case T_OSTYPE: 281 state = S_KEYWORD; 282 break; 283 284 case T_MACRO: 285 if (gettoken(&ptr, defs) == NULL) { 286 (void) fprintf(stderr, "%s: \"%s\", %d: Missing macro name\n", 287 pname, fname, lineno); 288 break; 289 } 290 if (gettoken(&ptr, stmt) == NULL) { 291 (void) fprintf(stderr, "%s: \"%s\", %d: Missing macro body\n", 292 pname, fname, lineno); 293 break; 294 } 295 (void) fprintf(stdout, "\n#if %s\n# define %s\n#endif\n\n", stmt, 296 defs); 297 break; 298 299 case T_NONE: 300 if (state != S_CODE && *defs != '\0') { 301 (void) fprintf(stderr, "%s: \"%s\", %d: Discarded\n", 302 pname, fname, lineno); 303 if (++errs == 30) { 304 (void) fprintf(stderr, "%s: Too many errors\n", pname); 305 return 1; 306 } 307 break; 308 } 309 (void) fprintf(stdout, "%s", line); 310 break; 311 312 default: 313 (void) fprintf(stderr, "%s: \"%s\", %d: Unexpected token\n", 314 pname, fname, lineno); 315 return 1; 316 } 317 318 switch (state) { 319 case S_DISCARD: 320 if (inprocess) { 321 inprocess = 0; 322 (void) fprintf(stdout, "#endif\n"); 323 } 324 break; 325 326 case S_KEYWORD: 327 tok = gettoken(&ptr, defs); 328 if (token == T_NEWDEF) { 329 if (inprocess) { 330 (void) fprintf(stderr, "%s: \"%s\", %d: Missing enddef\n", 331 pname, fname, lineno); 332 return 1; 333 } 334 if (tok == NULL) { 335 (void) fprintf(stderr, "%s: \"%s\", %d: No defs\n", 336 pname, fname, lineno); 337 return 1; 338 } 339 (void) fprintf(stdout, "\n\n"); 340 #ifdef LINEDIRECTIVE 341 (void) fprintf(stdout, "# %d \"%s\"\n", lineno + 1, fname); 342 #endif /* LINEDIRECTIVE */ 343 (void) fprintf(stdout, "#if %s\n", defs); 344 inprocess = 1; 345 } 346 else { 347 if (tok && *tok) 348 (void) fprintf(stdout, "# if (%s) && !defined(_%s_)\n", 349 explode(defs), keyword[token]); 350 else 351 (void) fprintf(stdout, "# if !defined(_%s_)\n", 352 keyword[token]); 353 354 if (gettoken(&ptr, stmt) == NULL) { 355 (void) fprintf(stderr, "%s: \"%s\", %d: No statement\n", 356 pname, fname, lineno); 357 return 1; 358 } 359 (void) fprintf(stdout, "# define _%s_\n", keyword[token]); 360 (void) fprintf(stdout, " %s = %s;\n", keyword[token], stmt); 361 (void) fprintf(stdout, "# endif\n"); 362 } 363 break; 364 365 case S_COMMENT: 366 if (gettoken(&ptr, defs)) 367 (void) fprintf(stdout, " /* %s */\n", defs); 368 break; 369 370 case S_CODE: 371 if (token == T_NEWCODE) { 372 #ifdef LINEDIRECTIVE 373 (void) fprintf(stdout, "# %d \"%s\"\n", lineno + 1, fname); 374 #endif /* LINEDIRECTIVE */ 375 } 376 break; 377 378 default: 379 (void) fprintf(stderr, "%s: \"%s\", %d: Unexpected state\n", 380 pname, fname, lineno); 381 return 1; 382 } 383 } 384 385 if (inprocess) { 386 (void) fprintf(stderr, "%s: \"%s\", %d: Missing enddef\n", 387 pname, fname, lineno); 388 return 1; 389 } 390 391 if (fp != stdin) 392 (void) fclose(fp); 393 394 return 0; 395 } 396