bin/sh/mkinit.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Kenneth Almquist.
   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  * @(#) Copyright (c) 1991, 1993 The Regents of the University of California.  All rights reserved.
  37  * @(#)mkinit.c 8.2 (Berkeley) 5/4/95
  38  * $FreeBSD: src/bin/sh/mkinit.c,v 1.14.2.1 2002/07/19 04:38:51 tjr Exp $
  39  * $DragonFly: src/bin/sh/mkinit.c,v 1.4 2005/04/19 07:18:19 cpressey Exp $
  40  */
  41
  42 /*
  43  * This program scans all the source files for code to handle various
  44  * special events and combines this code into one file.  This (allegedly)
  45  * improves the structure of the program since there is no need for
  46  * anyone outside of a module to know that that module performs special
  47  * operations on particular events.
  48  *
  49  * Usage:  mkinit sourcefile...
  50  */
  51
  52
  53 #include <sys/cdefs.h>
  54 #include <sys/types.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <fcntl.h>
  59 #include <unistd.h>
  60 #include <errno.h>
  61
  62
  63 /*
  64  * OUTFILE is the name of the output file.  Output is initially written
  65  * to the file OUTTEMP, which is then moved to OUTFILE.
  66  */
  67
  68 #define OUTFILE "init.c"
  69 #define OUTTEMP "init.c.new"
  70
  71
  72 /*
  73  * A text structure is basicly just a string that grows as more characters
  74  * are added onto the end of it.  It is implemented as a linked list of
  75  * blocks of characters.  The routines addstr and addchar append a string
  76  * or a single character, respectively, to a text structure.  Writetext
  77  * writes the contents of a text structure to a file.
  78  */
  79
  80 #define BLOCKSIZE 512
  81
  82 struct text {
  83         char *nextc;
  84         int nleft;
  85         struct block *start;
  86         struct block *last;
  87 };
  88
  89 struct block {
  90         struct block *next;
  91         char text[BLOCKSIZE];
  92 };
  93
  94
  95 /*
  96  * There is one event structure for each event that mkinit handles.
  97  */
  98
  99 struct event {
 100         const char *name;       /* name of event (e.g. INIT) */
 101         const char *routine;    /* name of routine called on event */
 102         const char *comment;    /* comment describing routine */
 103         struct text code;       /* code for handling event */
 104 };
 105
 106
 107 char writer[] = "\
 108 /*\n\
 109  * This file was generated by the mkinit program.\n\
 110  */\n\
 111 \n";
 112
 113 char init[] = "\
 114 /*\n\
 115  * Initialization code.\n\
 116  */\n";
 117
 118 char reset[] = "\
 119 /*\n\
 120  * This routine is called when an error or an interrupt occurs in an\n\
 121  * interactive shell and control is returned to the main command loop.\n\
 122  */\n";
 123
 124 char shellproc[] = "\
 125 /*\n\
 126  * This routine is called to initialize the shell to run a shell procedure.\n\
 127  */\n";
 128
 129
 130 struct event event[] = {
 131         {"INIT", "init", init, {NULL, 0, NULL, NULL}},
 132         {"RESET", "reset", reset, {NULL, 0, NULL, NULL}},
 133         {"SHELLPROC", "initshellproc", shellproc, {NULL, 0, NULL, NULL}},
 134         {NULL, NULL, NULL, {NULL, 0, NULL, NULL}}
 135 };
 136
 137
 138 const char *curfile;                    /* current file */
 139 int linno;                              /* current line */
 140 const char *header_files[200];          /* list of header files */
 141 struct text defines;                    /* #define statements */
 142 struct text decls;                      /* declarations */
 143 int amiddecls;                          /* for formatting */
 144
 145
 146 void readfile(const char *);
 147 int match(const char *, const char *);
 148 int gooddefine(const char *);
 149 void doevent(struct event *, FILE *, const char *);
 150 void doinclude(char *);
 151 void dodecl(char *, FILE *);
 152 void output(void);
 153 void addstr(const char *, struct text *);
 154 void addchar(int, struct text *);
 155 void writetext(struct text *, FILE *);
 156 FILE *ckfopen(const char *, const char *);
 157 void *ckmalloc(int);
 158 char *savestr(const char *);
 159 void error(const char *);
 160
 161 #define equal(s1, s2)   (strcmp(s1, s2) == 0)
 162
 163 int
 164 main(int argc __unused, char *argv[])
 165 {
 166         char **ap;
 167
 168         header_files[0] = "\"shell.h\"";
 169         header_files[1] = "\"mystring.h\"";
 170         header_files[2] = "\"init.h\"";
 171         for (ap = argv + 1 ; *ap ; ap++)
 172                 readfile(*ap);
 173         output();
 174         rename(OUTTEMP, OUTFILE);
 175         exit(0);
 176 }
 177
 178
 179 /*
 180  * Parse an input file.
 181  */
 182
 183 void
 184 readfile(const char *fname)
 185 {
 186         FILE *fp;
 187         char line[1024];
 188         struct event *ep;
 189
 190         fp = ckfopen(fname, "r");
 191         curfile = fname;
 192         linno = 0;
 193         amiddecls = 0;
 194         while (fgets(line, sizeof line, fp) != NULL) {
 195                 linno++;
 196                 for (ep = event ; ep->name ; ep++) {
 197                         if (line[0] == ep->name[0] && match(ep->name, line)) {
 198                                 doevent(ep, fp, fname);
 199                                 break;
 200                         }
 201                 }
 202                 if (line[0] == 'I' && match("INCLUDE", line))
 203                         doinclude(line);
 204                 if (line[0] == 'M' && match("MKINIT", line))
 205                         dodecl(line, fp);
 206                 if (line[0] == '#' && gooddefine(line)) {
 207                         char *cp;
 208                         char line2[1024];
 209                         static const char undef[] = "#undef ";
 210
 211                         strcpy(line2, line);
 212                         memcpy(line2, undef, sizeof(undef) - 1);
 213                         cp = line2 + sizeof(undef) - 1;
 214                         while(*cp && (*cp == ' ' || *cp == '\t'))
 215                                 cp++;
 216                         while(*cp && *cp != ' ' && *cp != '\t' && *cp != '\n')
 217                                 cp++;
 218                         *cp++ = '\n'; *cp = '\0';
 219                         addstr(line2, &defines);
 220                         addstr(line, &defines);
 221                 }
 222         }
 223         fclose(fp);
 224 }
 225
 226
 227 int
 228 match(const char *name, const char *line)
 229 {
 230         const char *p, *q;
 231
 232         p = name, q = line;
 233         while (*p) {
 234                 if (*p++ != *q++)
 235                         return 0;
 236         }
 237         if (*q != '{' && *q != ' ' && *q != '\t' && *q != '\n')
 238                 return 0;
 239         return 1;
 240 }
 241
 242
 243 int
 244 gooddefine(const char *line)
 245 {
 246         const char *p;
 247
 248         if (! match("#define", line))
 249                 return 0;                       /* not a define */
 250         p = line + 7;
 251         while (*p == ' ' || *p == '\t')
 252                 p++;
 253         while (*p != ' ' && *p != '\t') {
 254                 if (*p == '(')
 255                         return 0;               /* macro definition */
 256                 p++;
 257         }
 258         while (*p != '\n' && *p != '\0')
 259                 p++;
 260         if (p[-1] == '\\')
 261                 return 0;                       /* multi-line definition */
 262         return 1;
 263 }
 264
 265
 266 void
 267 doevent(struct event *ep, FILE *fp, const char *fname)
 268 {
 269         char line[1024];
 270         int indent;
 271         char *p;
 272
 273         sprintf(line, "\n      /* from %s: */\n", fname);
 274         addstr(line, &ep->code);
 275         addstr("      {\n", &ep->code);
 276         for (;;) {
 277                 linno++;
 278                 if (fgets(line, sizeof line, fp) == NULL)
 279                         error("Unexpected EOF");
 280                 if (equal(line, "}\n"))
 281                         break;
 282                 indent = 6;
 283                 for (p = line ; *p == '\t' ; p++)
 284                         indent += 8;
 285                 for ( ; *p == ' ' ; p++)
 286                         indent++;
 287                 if (*p == '\n' || *p == '#')
 288                         indent = 0;
 289                 while (indent >= 8) {
 290                         addchar('\t', &ep->code);
 291                         indent -= 8;
 292                 }
 293                 while (indent > 0) {
 294                         addchar(' ', &ep->code);
 295                         indent--;
 296                 }
 297                 addstr(p, &ep->code);
 298         }
 299         addstr("      }\n", &ep->code);
 300 }
 301
 302
 303 void
 304 doinclude(char *line)
 305 {
 306         char *p;
 307         char *name;
 308         const char **pp;
 309
 310         for (p = line ; *p != '"' && *p != '<' && *p != '\0' ; p++);
 311         if (*p == '\0')
 312                 error("Expecting '\"' or '<'");
 313         name = p;
 314         while (*p != ' ' && *p != '\t' && *p != '\n')
 315                 p++;
 316         if (p[-1] != '"' && p[-1] != '>')
 317                 error("Missing terminator");
 318         *p = '\0';
 319
 320         /* name now contains the name of the include file */
 321         for (pp = header_files ; *pp && ! equal(*pp, name) ; pp++);
 322         if (*pp == NULL)
 323                 *pp = savestr(name);
 324 }
 325
 326
 327 void
 328 dodecl(char *line1, FILE *fp)
 329 {
 330         char line[1024];
 331         char *p, *q;
 332
 333         if (strcmp(line1, "MKINIT\n") == 0) { /* start of struct/union decl */
 334                 addchar('\n', &decls);
 335                 do {
 336                         linno++;
 337                         if (fgets(line, sizeof line, fp) == NULL)
 338                                 error("Unterminated structure declaration");
 339                         addstr(line, &decls);
 340                 } while (line[0] != '}');
 341                 amiddecls = 0;
 342         } else {
 343                 if (! amiddecls)
 344                         addchar('\n', &decls);
 345                 q = NULL;
 346                 for (p = line1 + 6 ; *p && strchr("=/\n", *p) == NULL; p++)
 347                         continue;
 348                 if (*p == '=') {                /* eliminate initialization */
 349                         for (q = p ; *q && *q != ';' ; q++);
 350                         if (*q == '\0')
 351                                 q = NULL;
 352                         else {
 353                                 while (p[-1] == ' ')
 354                                         p--;
 355                                 *p = '\0';
 356                         }
 357                 }
 358                 addstr("extern", &decls);
 359                 addstr(line1 + 6, &decls);
 360                 if (q != NULL)
 361                         addstr(q, &decls);
 362                 amiddecls = 1;
 363         }
 364 }
 365
 366
 367
 368 /*
 369  * Write the output to the file OUTTEMP.
 370  */
 371
 372 void
 373 output(void)
 374 {
 375         FILE *fp;
 376         const char * const *pp;
 377         struct event *ep;
 378
 379         fp = ckfopen(OUTTEMP, "w");
 380         fputs(writer, fp);
 381         for (pp = header_files ; *pp ; pp++)
 382                 fprintf(fp, "#include %s\n", *pp);
 383         fputs("\n\n\n", fp);
 384         writetext(&defines, fp);
 385         fputs("\n\n", fp);
 386         writetext(&decls, fp);
 387         for (ep = event ; ep->name ; ep++) {
 388                 fputs("\n\n\n", fp);
 389                 fputs(ep->comment, fp);
 390                 fprintf(fp, "\nvoid\n%s(void) {\n", ep->routine);
 391                 writetext(&ep->code, fp);
 392                 fprintf(fp, "}\n");
 393         }
 394         fclose(fp);
 395 }
 396
 397
 398 /*
 399  * A text structure is simply a block of text that is kept in memory.
 400  * Addstr appends a string to the text struct, and addchar appends a single
 401  * character.
 402  */
 403
 404 void
 405 addstr(const char *s, struct text *text)
 406 {
 407         while (*s) {
 408                 if (--text->nleft < 0)
 409                         addchar(*s++, text);
 410                 else
 411                         *text->nextc++ = *s++;
 412         }
 413 }
 414
 415
 416 void
 417 addchar(int c, struct text *text)
 418 {
 419         struct block *bp;
 420
 421         if (--text->nleft < 0) {
 422                 bp = ckmalloc(sizeof *bp);
 423                 if (text->start == NULL)
 424                         text->start = bp;
 425                 else
 426                         text->last->next = bp;
 427                 text->last = bp;
 428                 text->nextc = bp->text;
 429                 text->nleft = BLOCKSIZE - 1;
 430         }
 431         *text->nextc++ = c;
 432 }
 433
 434 /*
 435  * Write the contents of a text structure to a file.
 436  */
 437 void
 438 writetext(struct text *text, FILE *fp)
 439 {
 440         struct block *bp;
 441
 442         if (text->start != NULL) {
 443                 for (bp = text->start ; bp != text->last ; bp = bp->next)
 444                         fwrite(bp->text, sizeof (char), BLOCKSIZE, fp);
 445                 fwrite(bp->text, sizeof (char), BLOCKSIZE - text->nleft, fp);
 446         }
 447 }
 448
 449 FILE *
 450 ckfopen(const char *file, const char *mode)
 451 {
 452         FILE *fp;
 453
 454         if ((fp = fopen(file, mode)) == NULL) {
 455                 fprintf(stderr, "Can't open %s: %s\n", file, strerror(errno));
 456                 exit(2);
 457         }
 458         return fp;
 459 }
 460
 461 void *
 462 ckmalloc(int nbytes)
 463 {
 464         char *p;
 465
 466         if ((p = malloc(nbytes)) == NULL)
 467                 error("Out of space");
 468         return p;
 469 }
 470
 471 char *
 472 savestr(const char *s)
 473 {
 474         char *p;
 475
 476         p = ckmalloc(strlen(s) + 1);
 477         strcpy(p, s);
 478         return p;
 479 }
 480
 481 void
 482 error(const char *msg)
 483 {
 484         if (curfile != NULL)
 485                 fprintf(stderr, "%s:%d: ", curfile, linno);
 486         fprintf(stderr, "%s\n", msg);
 487         exit(2);
 488 }